/* ============================================================================
   CLAIM 169 — STYLES
   Tokens live in tokens.css. This file = reset, base, layout, components,
   section styles, and responsive rules. Sections are labeled to match the
   markup comments in index.html.
   ========================================================================== */

/* ---------------------------------------------------------------- RESET -- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
* {
  margin: 0;
}
/* In-page scrolling is JS-driven (rAF) for fluid motion + live nav highlight;
   keep CSS scroll-behavior auto so the two don't fight. */
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: auto;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}
/* ── ICON SYSTEM ─────────────────────────────────────────────────────────
   Every <svg> is an outline icon: no fill, stroke = currentcolor (adapts to
   theme), ONE stroke weight, round caps/joins (Lucide-style). CSS overrides
   any per-icon stroke-width="…" attribute, so all icons match regardless of
   their markup. Filled brand/media glyphs opt out via the rules below. */
svg {
  fill: none;
  stroke: currentcolor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: middle;
}
/* Filled exceptions: GitHub brand mark + the video play triangle.
   !important so the many context rules that set `stroke: currentcolor`
   can't add an unwanted outline onto a solid glyph. */
svg[fill="currentcolor"] {
  fill: currentcolor !important;
  stroke: none !important;
  stroke-width: 0 !important;
}
button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}
button {
  cursor: pointer;
  background: none;
  border: none;
}
a {
  color: inherit;
  text-decoration: none;
}
ul,
ol {
  list-style: none;
  padding: 0;
}
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}
:where(p) {
  text-wrap: pretty;
}

/* --------------------------------------------------------- ACCESSIBILITY -- */
.skip-link {
  position: fixed;
  left: var(--space-4);
  top: -100px;
  z-index: var(--z-overlay);
  background: var(--accent);
  color: var(--accent-contrast);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-weight: var(--weight-semibold);
  box-shadow: var(--shadow-lg);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus {
  top: var(--space-4);
  outline: none;
  box-shadow:
    var(--shadow-lg),
    0 0 0 3px var(--accent-contrast),
    0 0 0 5px var(--accent);
}
#main:focus {
  outline: none;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ----------------------------------------------------------- PRIMITIVES -- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide {
  max-width: var(--container-wide);
}

.section {
  padding-block: var(--section-y);
}
.section--tint {
  background: var(--surface);
}
.section--sunken {
  background: var(--surface-sunken);
}

/* Eyebrow / pill label */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--accent-on-light);
  background: var(--accent-soft);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin-inline: auto;
  margin-bottom: var(--section-head-gap);
}
.section-head .eyebrow {
  margin-bottom: var(--space-4);
}
.section-head h2 {
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
}
.section-head p {
  margin-top: var(--space-4);
  color: var(--text-muted);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  max-width: 60ch;
  margin-inline: auto;
}

/* Inline arrow links */
.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-link);
  font-weight: var(--weight-semibold);
  min-height: 44px;
  padding-block: var(--space-1);
  transition:
    gap var(--dur) var(--ease),
    color var(--dur) var(--ease);
}
.arrow-link svg {
  width: 1.05em;
  height: 1.05em;
  stroke: currentcolor;
}
.arrow-link:hover {
  color: var(--accent-strong);
  gap: var(--space-3);
}

/* --------------------------------------------------------------- BUTTONS -- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-base);
  letter-spacing: 0.01em;
  border: 1.5px solid transparent;
  transition:
    transform var(--dur) var(--ease),
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    color var(--dur) var(--ease);
}
.btn svg {
  width: 1.15em;
  height: 1.15em;
  stroke: currentcolor;
}

.btn--primary {
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow: var(--shadow-accent);
}
.btn--primary:hover {
  background: var(--accent-strong);
}

.btn--ghost-dark {
  background: var(--dark-surface-2);
  color: var(--on-dark);
  border-color: var(--dark-border);
}
.btn--ghost-dark:hover {
  background: rgba(255, 255, 255, 0.12);
}

.btn--outline {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent-on-light);
}

.btn--block {
  width: 100%;
}

/* ----------------------------------------------------------------- CHIPS -- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  background: var(--surface-alt);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.chip svg {
  width: 1.05em;
  height: 1.05em;
  stroke: currentcolor;
}
.chip--accent {
  background: var(--accent-soft);
  color: var(--accent-on-light);
  border-color: transparent;
}
.chip--success {
  background: var(--success-soft);
  color: #0a6b49;
  border-color: transparent;
}
.chip--warning {
  background: var(--warning-soft);
  color: #8a5a06;
  border-color: transparent;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* Monospace data badge (RFC numbers etc.) */
.code-badge {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  padding: 2px var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--success-soft);
  color: #0a6b49;
  border: 1px solid rgba(15, 157, 107, 0.25);
}

/* ============================================================== HEADER === */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  min-height: var(--header-h);
  padding-block: var(--space-2);
}
.brand {
  display: inline-flex;
  flex-direction: column;
  line-height: 1.05;
  flex-shrink: 0;
}
.brand__name {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: 1.35rem;
  letter-spacing: 0.02em;
  color: var(--text);
}
.brand__name b {
  color: var(--accent-on-light);
}
.brand__sub {
  font-size: 0.72rem;
  color: var(--text-subtle);
  letter-spacing: 0.04em;
}

/* Zone 2 — primary navigation (single gap, identical centered dividers) */
.primary-nav {
  margin-inline: auto;
}
.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 0;
}
.primary-nav li {
  display: flex;
  align-items: center;
}
/* one identical divider centered in the gap between every link */
.primary-nav li + li::before {
  content: "";
  align-self: center;
  flex-shrink: 0;
  width: 1px;
  height: 16px;
  background: color-mix(in srgb, var(--text) 16%, transparent);
}
.primary-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: var(--space-2) var(--space-2);
  font-size: 0.8125rem;
  font-weight: var(--weight-medium);
  letter-spacing: 0.01em;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}
.primary-nav a:hover {
  color: var(--text);
}
.primary-nav a[aria-current="page"],
.primary-nav a.is-active {
  color: var(--accent-on-light);
  font-weight: var(--weight-semibold);
}

/* Zone 3 + 4 — utility actions. Two tight sub-groups (icons | CTA) split by
   a divider; the inter-group gap is clearly larger than the in-group gap. */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}
.action-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.header-divider {
  width: 1px;
  height: 24px;
  flex-shrink: 0;
  background: color-mix(in srgb, var(--text) 18%, transparent);
  margin-inline: var(--space-3);
}
.icon-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  border: 1px solid var(--glass-border);
  transition:
    background var(--dur) var(--ease),
    color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}
.icon-btn:hover,
.icon-btn:focus-visible {
  background: var(--accent-soft);
  color: var(--accent-on-light);
}
.icon-btn:active {
  transform: scale(0.97);
}
.icon-btn svg {
  width: var(--icon-md);
  height: var(--icon-md);
  stroke: currentcolor;
}

/* Icon tooltip — theme-aware pill, caret up, fade + slight rise on hover/focus */
.tt {
  position: absolute;
  top: calc(100% + 9px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  background: var(--tt-bg);
  color: var(--tt-fg);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  white-space: nowrap;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  z-index: var(--z-overlay);
  transition:
    opacity 140ms var(--ease),
    transform 140ms var(--ease);
}
.tt::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-bottom-color: var(--tt-bg);
}
.icon-btn:hover .tt,
.icon-btn:focus-visible .tt,
.theme-toggle:hover .tt,
.theme-toggle:focus-visible .tt {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .tt {
    transition: opacity 1ms;
  }
}

.header-actions .btn {
  height: 40px;
  min-height: 0;
  padding-block: 0;
  padding-inline: var(--space-4);
  border-radius: var(--radius-md);
  line-height: 1;
}
/* Primary standout — brand blue */
.btn--latest {
  background: var(--accent);
  color: var(--accent-contrast);
  font-size: var(--text-sm);
  border-color: transparent;
  box-shadow: var(--shadow-accent);
}
.btn--latest:hover {
  background: var(--accent-strong);
}

/* Drawer-only action links (mobile menu); hidden on desktop */
.nav-drawer-actions {
  display: none;
}

.nav-toggle {
  display: none;
}

/* ================================================================= HERO === */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(
      1100px 600px at 78% -10%,
      rgba(37, 99, 235, 0.18),
      transparent 60%
    ),
    linear-gradient(180deg, var(--neutral-900), var(--neutral-950));
  color: var(--on-dark);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  padding-block: clamp(3rem, 1.5rem + 7vw, 6.5rem);
  align-items: center;
}
.hero__badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  background: var(--dark-surface-2);
  border: 1px solid var(--dark-border);
}
.hero__badge svg {
  width: var(--icon-sm);
  height: var(--icon-sm);
  stroke: currentcolor;
}
.hero__badge-logo {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  object-fit: contain;
  flex-shrink: 0;
}
.hero__badge--accent {
  color: var(--warning);
}
.hero__badge--accent {
  color: #f4b740;
}
.hero__dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--on-dark-subtle);
}

.hero h1 {
  font-size: var(--text-5xl);
  font-weight: var(--weight-extra);
  letter-spacing: -0.03em;
}
.hero h1 .accent {
  color: #3b82f6;
  display: block;
}
.hero__lede {
  margin-top: var(--space-5);
  color: var(--on-dark-muted);
  font-size: var(--text-xl);
  line-height: var(--leading-relaxed);
  max-width: 36ch;
}
.hero__highlight {
  display: block;
  margin-top: var(--space-6);
  color: #f4b740;
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-10);
  max-width: 540px;
}
.stat-card {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--dark-surface);
  border: 1px solid var(--dark-border);
}
.stat-card__num {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--weight-extra);
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1.05;
  display: inline-flex;
  align-items: baseline;
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}
.stat-num {
  display: inline-block;
  text-align: right;
}
.stat-plus {
  margin-left: 1px;
}
.stat-num.is-pop {
  animation: stat-pop 440ms var(--ease) both;
  transform-origin: left center;
}
@keyframes stat-pop {
  0% {
    transform: scale(1);
  }
  42% {
    transform: scale(1.13);
  }
  100% {
    transform: scale(1);
  }
}
.stat-card__label {
  font-size: var(--text-sm);
  color: var(--on-dark-muted);
  margin-top: 4px;
}
/* Label entrance — only armed when JS adds the marker (no-JS/print show normally) */
.hero__stats--anim .stat-card__label {
  opacity: 0;
  transform: translateY(6px);
  transition:
    opacity 0.5s var(--ease),
    transform 0.5s var(--ease);
}
.hero__stats--anim .stat-card__label.is-in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .stat-num.is-pop {
    animation: none;
  }
  .hero__stats--anim .stat-card__label {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Hero QR panel */
.hero__visual {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.hero__visual-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--on-dark-subtle);
  text-align: center;
}
.qr-panel {
  aspect-ratio: 1;
  max-width: 420px;
  width: 100%;
  margin-inline: auto;
  position: relative;
  border-radius: var(--radius-2xl);
  background: var(--dark-surface);
  border: 1px solid var(--dark-border);
  display: grid;
  place-items: center;
  padding: clamp(1.5rem, 4vw, 3rem);
}
.qr-corner {
  position: absolute;
  width: 34px;
  height: 34px;
  border: 3px solid #3b82f6;
}
.qr-corner--tl {
  top: 22px;
  left: 22px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: 8px;
}
.qr-corner--tr {
  top: 22px;
  right: 22px;
  border-left: 0;
  border-bottom: 0;
  border-top-right-radius: 8px;
}
.qr-corner--bl {
  bottom: 22px;
  left: 22px;
  border-right: 0;
  border-top: 0;
  border-bottom-left-radius: 8px;
}
.qr-corner--br {
  bottom: 22px;
  right: 22px;
  border-left: 0;
  border-top: 0;
  border-bottom-right-radius: 8px;
}
.qr-matrix {
  position: relative;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  width: 100%;
  max-width: 230px;
  aspect-ratio: 1;
}
.qr-matrix span {
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.07);
}
.qr-matrix span.on {
  background: #3b82f6;
}
.qr-badge {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--neutral-950);
  border: 2px solid #3b82f6;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  color: #3b82f6;
  font-size: 1.1rem;
}
.qr-legend {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 420px;
  margin-inline: auto;
  width: 100%;
}
.qr-legend li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--on-dark-muted);
  font-size: var(--text-base);
}
.qr-legend .ldot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ---- QR SCANNER ANIMATION ------------------------------------------------
   "Scan & confirm" load sequence → quiet ambient loop. State is driven by
   classes on #qr-panel (.is-scanning / .is-done) added by main.js. All motion
   is transform/opacity only and clipped to the panel's rounded bounds.       */
.qr-panel {
  overflow: hidden;
}
/* Corner brackets: hidden until lock-on */
.qr-corner {
  opacity: 0;
  transition: opacity 0.35s var(--ease);
}
.qr-scan {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 26%;
  pointer-events: none;
  opacity: 0;
  z-index: 4;
  background: linear-gradient(
    to bottom,
    transparent,
    color-mix(in srgb, var(--accent-bright) 28%, transparent) 70%,
    color-mix(in srgb, var(--accent-bright) 75%, transparent)
  );
  border-bottom: 2px solid var(--accent-bright);
  box-shadow: 0 0 22px 4px
    color-mix(in srgb, var(--accent-bright) 45%, transparent);
}
.qr-matrix span {
  transition: none;
}
.qr-badge__ring {
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  border: 2px solid var(--accent-bright);
  opacity: 0;
  pointer-events: none;
}

/* ---- Load: lock-on corners (quick focus nudge + glow) ---- */
.qr-panel.is-scanning .qr-corner {
  opacity: 1;
  animation: qr-lock 0.55s var(--ease) both;
}
.qr-panel.is-scanning .qr-corner--tl {
  animation-delay: 0s;
}
.qr-panel.is-scanning .qr-corner--tr {
  animation-delay: 0.05s;
}
.qr-panel.is-scanning .qr-corner--bl {
  animation-delay: 0.1s;
}
.qr-panel.is-scanning .qr-corner--br {
  animation-delay: 0.15s;
}
@keyframes qr-lock {
  0% {
    opacity: 0;
  }
  40% {
    opacity: 1;
    filter: drop-shadow(0 0 0 transparent);
  }
  60% {
    transform: translate(var(--lx, 0), var(--ly, 0));
    filter: drop-shadow(0 0 6px var(--accent-bright));
  }
  100% {
    transform: translate(0, 0);
    filter: drop-shadow(0 0 0 transparent);
  }
}
.qr-corner--tl {
  --lx: 6px;
  --ly: 6px;
}
.qr-corner--tr {
  --lx: -6px;
  --ly: 6px;
}
.qr-corner--bl {
  --lx: 6px;
  --ly: -6px;
}
.qr-corner--br {
  --lx: -6px;
  --ly: -6px;
}

/* ---- Load: scan sweep top→bottom (masked by panel overflow) ---- */
.qr-panel.is-scanning .qr-scan {
  animation: qr-sweep 1.15s 0.5s var(--ease) both;
}
@keyframes qr-sweep {
  0% {
    opacity: 0;
    transform: translateY(-110%);
  }
  12% {
    opacity: 1;
  }
  88% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translateY(440%);
  }
}

/* ---- Load: accent cells ripple in behind the beam ---- */
.qr-panel.is-scanning .qr-matrix span.on {
  animation: qr-cell 0.42s var(--ease) both;
}
@keyframes qr-cell {
  0% {
    opacity: 0.25;
    transform: scale(0.7);
    filter: brightness(0.8);
  }
  55% {
    opacity: 1;
    transform: scale(1.18);
    filter: brightness(1.5);
  }
  100% {
    opacity: 1;
    transform: scale(1);
    filter: brightness(1);
  }
}

/* ---- Load: 169 badge confirm punch + ring pulse ---- */
.qr-panel.is-scanning .qr-badge {
  animation: qr-confirm 0.5s 1.55s var(--ease) both;
}
@keyframes qr-confirm {
  0%,
  40% {
    transform: scale(1);
  }
  62% {
    transform: scale(1.14);
  }
  100% {
    transform: scale(1);
  }
}
.qr-panel.is-scanning .qr-badge__ring {
  animation: qr-ring 0.7s 1.6s var(--ease) both;
}
@keyframes qr-ring {
  0% {
    opacity: 0.8;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(2.1);
  }
}

/* ---- Ambient loop (after sequence) ---- */
.qr-panel.is-done .qr-corner {
  opacity: 1;
}
.qr-panel.is-done .qr-scan {
  animation: qr-ambient-sweep 7s 1s ease-in-out infinite;
}
@keyframes qr-ambient-sweep {
  0% {
    opacity: 0;
    transform: translateY(-110%);
  }
  4% {
    opacity: 0.8;
  }
  18% {
    opacity: 0.8;
  }
  24%,
  100% {
    opacity: 0;
    transform: translateY(440%);
  }
}
.qr-panel.is-done .qr-badge {
  animation: qr-breathe 4.5s ease-in-out infinite;
}
@keyframes qr-breathe {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

/* Re-trigger on hover/tap (class toggled by JS so it can restart cleanly) */
.qr-panel.is-replay .qr-scan {
  animation: qr-sweep 1.1s var(--ease) both;
}
.qr-panel.is-replay .qr-badge {
  animation: qr-confirm 0.5s 0.9s var(--ease) both;
}
.qr-panel.is-replay .qr-badge__ring {
  animation: qr-ring 0.7s 0.95s var(--ease) both;
}

@media (prefers-reduced-motion: reduce) {
  .qr-corner {
    opacity: 1;
  }
  .qr-scan {
    display: none;
  }
  .qr-panel.is-scanning .qr-corner,
  .qr-panel.is-scanning .qr-matrix span.on,
  .qr-panel.is-scanning .qr-badge,
  .qr-panel.is-scanning .qr-badge__ring,
  .qr-panel.is-done .qr-scan,
  .qr-panel.is-done .qr-badge {
    animation: none;
  }
}

/* ================================================================ ABOUT === */
.about-head {
  margin-bottom: var(--section-head-gap);
}

/* Guided two-step flow: 01 What → connector → 02 Why */
.about-flow {
  display: flex;
  flex-direction: column;
}
.about-part {
  position: relative;
}

.about-part__head {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}
.about-part__step {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-2xl);
  color: var(--accent-contrast);
  background: var(--accent);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
}
.about-part--why .about-part__step {
  background: var(--warning);
}
.about-part__kicker {
  display: block;
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--accent-on-light);
  margin-bottom: var(--space-2);
}
.about-part--why .about-part__kicker {
  color: var(--warning);
}
.about-part__title {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
}
.about-part--what .about-part__title {
  color: var(--accent-on-light);
}
.about-part--why .about-part__title {
  color: var(--warning);
}

.about-part__lede {
  font-size: var(--text-xl);
  line-height: var(--leading-relaxed);
  color: var(--text);
  max-width: 64ch;
  margin-bottom: var(--space-8);
}

/* Two primary supporting cards: side-by-side on desktop, stacked on mobile.
   align-items:stretch → cards in a row match the tallest; per-section, per-row. */
.about-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  align-items: stretch;
}
.about-cards .edge-card {
  margin-top: 0;
}
.about-part > .edge-card {
  margin-top: var(--space-6);
} /* the closing key-takeaway callout */
.about-part__outro {
  margin-top: var(--space-8);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--text-muted);
  max-width: var(--measure);
}
.about-part .about-tags {
  margin-top: var(--space-4);
}
.about-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.about-part .about-links {
  margin-top: var(--space-6);
}

/* Connector between the two steps */
.about-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-8);
  color: var(--text-subtle);
}
.about-connector__line {
  width: 2px;
  height: var(--space-12);
  border-radius: 2px;
  background: linear-gradient(var(--accent), var(--warning));
  opacity: 0.55;
}
.about-connector__arrow {
  display: grid;
  place-items: center;
}
.about-connector__arrow svg {
  width: 24px;
  height: 24px;
  stroke: currentcolor;
}

/* Accent-edge info cards */
.edge-card {
  position: relative;
  margin-top: var(--space-8);
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-6) var(--space-6) var(--space-8);
  box-shadow: var(--shadow-sm);
}
.edge-card--soft-info {
  background: var(--accent-soft);
  border-color: transparent;
  border-left-color: var(--accent);
}
.edge-card--soft-success {
  background: var(--success-soft);
  border-color: transparent;
  border-left-color: var(--success);
}
.edge-card--danger {
  border-left-color: var(--danger);
}
.edge-card__label {
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  margin-bottom: var(--space-4);
  color: var(--accent-on-light);
}
.edge-card--soft-success .edge-card__label {
  color: #0a6b49;
}
.edge-card--danger .edge-card__label {
  color: var(--danger);
}
.edge-card__note {
  margin-top: var(--space-5);
  color: var(--text-subtle);
  font-style: italic;
  font-size: var(--text-base);
}

/* Check / cross feature lists (icon + label — not color alone) */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  line-height: var(--leading-snug);
}
.feature-list svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  margin-top: 2px;
  stroke: currentcolor;
}
.feature-list--check svg {
  color: var(--accent);
}
.feature-list--cross svg {
  color: var(--danger);
}

/* Standards definition rows */
.spec-rows {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.spec-row {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  gap: var(--space-3);
}
.spec-row__name {
  font-weight: var(--weight-bold);
  font-family: var(--font-display);
}
.spec-row__desc {
  color: var(--text-muted);
}

/* ========================================================== PROCESS ===== */
.process-track {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: stretch;
}
.process-step {
  position: relative;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}
.process-step__num {
  font-family: var(--font-mono);
  font-weight: var(--weight-bold);
  color: var(--text-subtle);
  font-size: var(--text-sm);
}
/* Step icon badge — frosted glass circle, blue icon (theme-aware) */
.process-step__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.process-step__badge {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  background: var(--accent-soft);
  color: var(--accent-on-light);
  border: 1px solid var(--glass-border);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(140%);
  backdrop-filter: blur(var(--blur)) saturate(140%);
  transition: transform var(--dur) var(--ease);
}
.process-step__badge svg {
  width: 24px;
  height: 24px;
  stroke: currentcolor;
}
.process-step:hover .process-step__badge {
  transform: translateY(-1px) scale(1.05);
}
.process-step h3 {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  margin-top: var(--space-2);
}
.process-step p {
  margin-top: var(--space-2);
  color: var(--text-muted);
  font-size: var(--text-base);
}
.process-foot {
  text-align: center;
  margin-top: var(--space-10);
}

/* ========================================================== REGISTRY ==== */
.registry-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.registry-spec {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-bottom: 1px solid var(--border);
}
.registry-spec__band {
  display: none;
}
.spec-cell {
  position: relative;
  padding: var(--space-5) var(--space-6);
  border-top: 1px solid var(--border);
}
/* Solid colour bar, flush to the top edge of each column */
.spec-cell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--c);
}
.spec-cell:nth-of-type(1) {
  --c: #014daf;
}
.spec-cell:nth-of-type(2) {
  --c: #0a8754;
}
.spec-cell:nth-of-type(3) {
  --c: #fec40d;
}
.spec-cell:nth-of-type(4) {
  --c: #fa8005;
}
.spec-cell:nth-of-type(5) {
  --c: #01a2fd;
}
.spec-cell:nth-of-type(6) {
  --c: #d64045;
}
.spec-cell__label {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-subtle);
}
.spec-cell__value {
  font-family: var(--font-mono);
  font-weight: var(--weight-medium);
  font-size: var(--text-lg);
  margin-top: var(--space-2);
}
.registry-body {
  padding: var(--space-6);
}
.registry-body > p {
  color: var(--text-muted);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  max-width: none;
}

.version-card {
  margin-top: var(--space-6);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  background: var(--surface);
}
.version-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}
.version-card__head .arrow-link {
  margin-left: auto;
}
/* Mobile: let the "All versions" CTA drop to its own full-width line, left-aligned,
   instead of being squeezed beside the pill/badge/date. */
@media (max-width: 560px) {
  .version-card__head .arrow-link {
    margin-left: 0;
    flex-basis: 100%;
  }
}
.version-pill {
  font-family: var(--font-mono);
  font-weight: var(--weight-bold);
  background: var(--accent);
  color: var(--accent-contrast);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
}
.version-card .arrow-link {
  margin-left: auto;
}
.version-card__desc {
  margin-top: var(--space-4);
  color: var(--text);
  font-weight: var(--weight-medium);
}
.version-card ul {
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.version-card li {
  display: flex;
  gap: var(--space-3);
  color: var(--text-muted);
}
.version-card li::before {
  content: "–";
  color: var(--accent);
  font-weight: var(--weight-bold);
}

/* ========================================================== USE CASES === */
.usecase-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
.usecase-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}
.usecase-card--feature {
  grid-column: 1 / -1;
}
.usecase-card.usecase-card--feature p {
  max-width: none;
}
.usecase-card__kicker {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-subtle);
}
.usecase-card h3 {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  margin-top: var(--space-3);
}
.usecase-card p {
  margin-top: var(--space-3);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
  max-width: var(--measure);
}
.usecase-card .tag-row {
  margin-top: var(--space-4);
}

/* -------------------------------------------------- CAROUSEL (Where) ---- */
.carousel {
  position: relative;
}
.carousel__viewport {
  overflow: hidden;
}
.carousel__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 88%;
  gap: var(--space-5);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: var(--space-2) var(--space-1) var(--space-5);
  scrollbar-width: none;
}
.carousel__track::-webkit-scrollbar {
  display: none;
}
.use-card {
  scroll-snap-align: start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.use-card--more {
  align-items: center;
  text-align: center;
  justify-content: center;
  border: 1px dashed var(--border-strong);
  background: transparent;
  box-shadow: none;
}
.use-card__icon {
  width: var(--icon-tile);
  height: var(--icon-tile);
  border-radius: var(--icon-tile-radius);
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent-on-light);
}
.use-card__icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
  stroke: currentcolor;
}
.use-card__kicker {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-subtle);
}
.use-card h3 {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
}
.use-card p {
  color: var(--text-muted);
}
.use-card .tag-row {
  margin-top: auto;
}

.carousel__btn {
  position: absolute;
  top: 40%;
  z-index: 2;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-md);
  color: var(--text);
  display: grid;
  place-items: center;
  transition:
    background var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}
.carousel__btn:hover {
  background: var(--surface-alt);
}
.carousel__btn[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
}
.carousel__btn svg {
  width: 22px;
  height: 22px;
  stroke: currentcolor;
}
.carousel__btn--prev {
  left: calc(-1 * var(--space-2));
}
.carousel__btn--next {
  right: calc(-1 * var(--space-2));
}

/* ---------------------------------------------------- GRADIENT CTA BAND - */
.band {
  margin-top: var(--space-12);
  background: linear-gradient(
    110deg,
    var(--accent-strong),
    var(--accent),
    #3b82f6
  );
  color: var(--accent-contrast);
  border-radius: var(--radius-xl);
  padding: clamp(2.5rem, 1.5rem + 4vw, 4.5rem) var(--gutter);
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.band p {
  font-size: var(--text-2xl);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
  max-width: 24ch;
  margin-inline: auto;
}

/* ============================================================ USE 169 ==== */
.use169-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: clamp(1.25rem, 0.9rem + 1.6vw, 2rem);
}
.use169-panel h3 {
  text-align: center;
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
}
.use169-panel > p {
  text-align: center;
  color: var(--text-muted);
  margin-top: var(--space-3);
}
.use169-options {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-6);
  align-items: stretch;
}
.option-tile {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  background: var(--surface);
  height: 100%;
}
.option-tile__icon {
  width: var(--icon-tile);
  height: var(--icon-tile);
  border-radius: var(--icon-tile-radius);
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent-on-light);
  flex-shrink: 0;
}
.option-tile__icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
  stroke: currentcolor;
}
.option-tile h4 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
}
.option-tile p {
  color: var(--text-muted);
  font-size: var(--text-base);
  margin-top: 2px;
}
.use169-cta {
  text-align: center;
  margin-top: var(--space-6);
}

.howto-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  margin-top: var(--space-10);
  margin-bottom: var(--space-6);
}
.howto-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
.howto-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}
.howto-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent-on-light);
  margin-bottom: var(--space-4);
}
.howto-card__icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
  stroke: currentcolor;
}
.howto-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
}
.howto-card p {
  margin-top: var(--space-3);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}
.howto-card .arrow-link {
  margin-top: var(--space-4);
}

/* ========================================================== CONTRIBUTE == */
.contribute-cta {
  background: linear-gradient(180deg, var(--neutral-900), var(--neutral-950));
  color: var(--on-dark);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 1rem + 2.4vw, 2.75rem);
  text-align: center;
  margin-top: var(--space-8);
}
.contribute-cta h3 {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
}
.contribute-cta p {
  margin-top: var(--space-4);
  color: var(--on-dark-muted);
  max-width: 60ch;
  margin-inline: auto;
  line-height: var(--leading-relaxed);
}
.contribute-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-6);
  max-width: 760px;
  margin-inline: auto;
}

/* ---- "Ready to get started?" CTA cards (unified set) ---- */
.cta-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-8);
  max-width: 760px;
  margin-inline: auto;
  text-align: left;
}
.cta-card {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  height: 100%;
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
  color: var(--text);
  cursor: pointer;
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}
.cta-card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow:
    var(--card-shadow-hover),
    0 0 0 1px var(--accent-soft-2),
    inset 0 1px 0 var(--glass-highlight);
  border-color: color-mix(in srgb, var(--glass-border) 55%, var(--accent) 45%);
}
.cta-card:focus-visible {
  box-shadow: var(--focus-ring);
}
.cta-card:active {
  transform: scale(0.98);
  transition-timing-function: var(--ease-press);
  transition-duration: var(--dur-fast);
}
.cta-card__icon {
  flex-shrink: 0;
  width: var(--icon-tile);
  height: var(--icon-tile);
  border-radius: var(--icon-tile-radius);
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent-on-light);
}
.cta-card__icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
  stroke: currentcolor;
}
.cta-card__body {
  display: flex;
  flex-direction: column;
  gap: 3px;
  flex: 1;
  min-width: 0;
}
.cta-card__label {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-base);
  line-height: var(--leading-snug);
}
.cta-card__desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-snug);
}
.cta-card__arrow {
  flex-shrink: 0;
  color: var(--text-subtle);
  display: grid;
  place-items: center;
  transition:
    transform var(--dur) var(--ease),
    color var(--dur) var(--ease);
}
.cta-card__arrow svg {
  width: 18px;
  height: 18px;
  stroke: currentcolor;
}
.cta-card:hover .cta-card__arrow {
  transform: translate(2px, -2px);
  color: var(--accent-on-light);
}

/* Primary CTA = solid brand blue, dominant */
.cta-card--primary {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: transparent;
  box-shadow: var(--shadow-accent);
}
.cta-card--primary .cta-card__icon {
  background: color-mix(in srgb, var(--accent-contrast) 22%, transparent);
  color: var(--accent-contrast);
}
.cta-card--primary .cta-card__desc {
  color: var(--accent-contrast);
  opacity: 0.85;
}
.cta-card--primary .cta-card__arrow {
  color: var(--accent-contrast);
}
.cta-card--primary:hover {
  border-color: transparent;
  box-shadow:
    var(--shadow-accent),
    0 16px 36px -10px var(--accent),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}
.cta-card--primary:hover .cta-card__arrow {
  transform: translate(2px, -2px);
  color: var(--accent-contrast);
}

@media (prefers-reduced-motion: reduce) {
  .cta-card,
  .cta-card__arrow {
    transition: none;
  }
  .cta-card:hover {
    transform: none;
  }
  .cta-card:hover .cta-card__arrow {
    transform: none;
  }
}
.contribute-cta__note {
  margin-top: var(--space-5);
  font-style: italic;
  color: var(--on-dark-subtle);
}

/* ========================================================= CONTRIBUTORS = */
.contributors-card {
  border: 1.5px solid var(--accent);
  border-radius: var(--radius-xl);
  background: var(--surface);
  padding: clamp(1.5rem, 1rem + 3vw, 3rem);
  box-shadow: var(--shadow-md);
}
.contributors-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-5);
}
.contributors-head__icon {
  width: var(--icon-tile);
  height: var(--icon-tile);
  border-radius: var(--icon-tile-radius);
  background: var(--accent-soft);
  color: var(--accent-on-light);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.contributors-head__icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
  stroke: currentcolor;
}
.contributors-head__body {
  flex: 1;
  min-width: 240px;
}
.contributors-head .eyebrow {
  margin-bottom: var(--space-3);
}
.contributors-head h2 {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
}
.contributors-head p {
  margin-top: var(--space-3);
  color: var(--text-muted);
  max-width: 60ch;
}
.collapse-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-pill);
  border: 1px solid var(--accent);
  color: var(--accent-on-light);
  font-weight: var(--weight-semibold);
  transition: background var(--dur) var(--ease);
}
.collapse-btn:hover {
  background: var(--accent-soft);
}
.collapse-btn svg {
  width: 18px;
  height: 18px;
  stroke: currentcolor;
  transition: transform var(--dur) var(--ease);
}
.collapse-btn[aria-expanded="false"] svg {
  transform: rotate(180deg);
}

.authors-title,
.orgs-title {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  margin-top: var(--space-10);
  margin-bottom: var(--space-5);
}
.authors-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
.author-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-xs);
  background: var(--surface);
}
.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  color: #fff;
  background: linear-gradient(150deg, var(--accent), var(--accent-bright));
}
.author-card__name {
  font-weight: var(--weight-semibold);
  font-family: var(--font-display);
}
.author-card .org-tag {
  margin-left: auto;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--text-subtle);
  background: var(--surface-alt);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
}

.orgs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
.org-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  background: var(--surface);
  box-shadow: var(--shadow-xs);
}
.org-card__head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.org-card__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cat-1);
}
.org-card__name {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
}
.org-card__count {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--text-subtle);
  background: var(--surface-alt);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
}
.org-card__role {
  color: var(--text-subtle);
  font-size: var(--text-sm);
  margin-top: var(--space-2);
}

/* Organizations header row with the global show/hide-members toggle */
.orgs-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-10);
  margin-bottom: var(--space-5);
}
.orgs-header .orgs-title {
  margin: 0;
}
.members-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--surface);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
  color: var(--accent-on-light);
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  cursor: pointer;
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}
.members-toggle:hover {
  transform: translateY(-2px);
  background: var(--surface-strong);
  border-color: color-mix(in srgb, var(--glass-border) 55%, var(--accent) 45%);
  box-shadow:
    var(--card-shadow-hover),
    inset 0 1px 0 var(--glass-highlight);
}
.members-toggle:focus-visible {
  box-shadow: var(--focus-ring);
}
.members-toggle__chev {
  width: 18px;
  height: 18px;
  stroke: currentcolor;
  transition: transform var(--dur) var(--ease);
}
.members-toggle[aria-expanded="true"] .members-toggle__chev {
  transform: rotate(180deg);
}

/* Cards stretch to the tallest in their row (per-row even baseline) */
.orgs-grid {
  align-items: stretch;
}
.org-card {
  display: flex;
  flex-direction: column;
}

/* Collapsible member list — true smooth height via grid-template-rows */
.org-card__members {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-slow) var(--ease);
}
.orgs-grid[data-members-open="true"] .org-card__members {
  grid-template-rows: 1fr;
}
.org-card__mwrap {
  overflow: hidden;
  min-height: 0;
}
.org-card__members ul {
  margin: var(--space-4) 0 0;
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.org-card__members li {
  display: flex;
  gap: var(--space-2);
  color: var(--text-muted);
  font-size: var(--text-sm);
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}
.org-card__members li::before {
  content: "•";
  color: var(--accent-on-light);
}
/* Staggered fade + rise once the section is expanded */
.orgs-grid[data-members-open="true"] .org-card__members li {
  opacity: 1;
  transform: none;
}
.orgs-grid[data-members-open="true"] .org-card__members li:nth-child(1) {
  transition-delay: 30ms;
}
.orgs-grid[data-members-open="true"] .org-card__members li:nth-child(2) {
  transition-delay: 70ms;
}
.orgs-grid[data-members-open="true"] .org-card__members li:nth-child(3) {
  transition-delay: 110ms;
}
.orgs-grid[data-members-open="true"] .org-card__members li:nth-child(4) {
  transition-delay: 150ms;
}
.orgs-grid[data-members-open="true"] .org-card__members li:nth-child(5) {
  transition-delay: 190ms;
}
.orgs-grid[data-members-open="true"] .org-card__members li:nth-child(6) {
  transition-delay: 230ms;
}
.orgs-grid[data-members-open="true"] .org-card__members li:nth-child(7) {
  transition-delay: 270ms;
}
.orgs-grid[data-members-open="true"] .org-card__members li:nth-child(8) {
  transition-delay: 310ms;
}
.orgs-grid[data-members-open="true"] .org-card__members li:nth-child(9) {
  transition-delay: 350ms;
}
.orgs-grid[data-members-open="true"] .org-card__members li:nth-child(n + 10) {
  transition-delay: 390ms;
}

@media (prefers-reduced-motion: reduce) {
  .org-card__members {
    transition: none;
  }
  .members-toggle,
  .members-toggle__chev {
    transition: none;
  }
  .members-toggle:hover {
    transform: none;
  }
  .org-card__members li {
    transition: none;
  }
  .orgs-grid[data-members-open="true"] .org-card__members li {
    transition-delay: 0ms !important;
  }
}

/* =============================================================== FAQ ===== */
.faq-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-8);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-8);
}
.faq-band__icon {
  width: var(--icon-tile);
  height: var(--icon-tile);
  border-radius: var(--icon-tile-radius);
  background: var(--accent-soft);
  color: var(--accent-on-light);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.faq-band__icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
  stroke: currentcolor;
}
.faq-band__body {
  flex: 1;
  min-width: 240px;
}
.faq-band__body h3 {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
}
.faq-band__body p {
  color: var(--text-muted);
  margin-top: var(--space-1);
}

.contact-band {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-5);
  background: linear-gradient(180deg, var(--neutral-900), var(--neutral-950));
  color: var(--on-dark);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 1rem + 2vw, 2.5rem);
}
.contact-band__icon {
  width: var(--icon-tile);
  height: var(--icon-tile);
  border-radius: var(--icon-tile-radius);
  background: var(--dark-surface-2);
  border: 1px solid var(--dark-border);
  color: var(--accent-on-light);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.contact-band__icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
  stroke: currentcolor;
}
.contact-band__icon {
  flex-shrink: 0;
}
.contact-band__body {
  flex: 1;
  min-width: 240px;
}
.contact-band__body h3 {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
}
.contact-band__body p {
  color: var(--on-dark-muted);
  margin-top: var(--space-2);
}
.contact-band__body a.mail {
  display: inline-block;
  margin-top: var(--space-3);
  color: #3b82f6;
  font-weight: var(--weight-semibold);
  font-size: var(--text-lg);
}

/* ============================================================= FOOTER ==== */
.site-footer {
  background: var(--neutral-950);
  color: var(--on-dark);
  padding-block: var(--space-8) var(--space-6);
}
.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5) var(--space-8);
}
.footer-brand {
  max-width: 46ch;
}
.footer-brand .brand__name {
  color: var(--on-dark);
}
.footer-brand p {
  margin-top: var(--space-2);
  color: var(--on-dark-muted);
  line-height: var(--leading-snug);
  font-size: var(--text-sm);
}
.footer-brand .meta {
  margin-top: var(--space-2);
  color: var(--on-dark-subtle);
  font-size: var(--text-sm);
}
.footer-brand .meta a {
  color: #3b82f6;
}
.footer-brand .meta b {
  color: #f4b740;
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-1);
  align-items: center;
  justify-content: flex-start;
}
.footer-nav a {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  padding-inline: var(--space-3);
  border-radius: var(--radius-md);
  color: var(--on-dark-muted);
  font-weight: var(--weight-medium);
  font-size: var(--text-sm);
  transition:
    color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}
.footer-nav a:hover {
  color: var(--on-dark);
  background: rgba(255, 255, 255, 0.06);
}
.footer-bottom {
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--dark-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: space-between;
  align-items: center;
  color: var(--on-dark-subtle);
  font-size: var(--text-sm);
}

/* ============================================================ RESPONSIVE = */
@media (min-width: 640px) {
  .hero__cta {
    flex-wrap: nowrap;
  }
  .usecase-grid {
    grid-template-columns: 1fr 1fr;
  }
  .authors-grid {
    grid-template-columns: 1fr 1fr;
  }
  .orgs-grid {
    grid-template-columns: 1fr 1fr;
  }
  .contribute-actions {
    grid-template-columns: 1fr 1fr;
  }
  .cta-grid {
    grid-template-columns: 1fr 1fr;
  }
  .carousel__track {
    grid-auto-columns: 46%;
  }
}

@media (min-width: 900px) {
  .process-track {
    grid-template-columns: repeat(3, 1fr);
  }
  .howto-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .use169-options {
    grid-template-columns: repeat(3, 1fr);
  }
  .authors-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .orgs-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .contribute-actions {
    grid-template-columns: repeat(4, 1fr);
  }
  .cta-grid {
    grid-template-columns: 1fr 1fr;
  }
  .carousel__track {
    grid-auto-columns: 31%;
  }
}

/* Hero CTAs (View Specification / GitHub) mirror the hamburger: shown while the
   hamburger is (≤1279px), hidden once the full desktop nav bar appears (≥1280). */
@media (min-width: 1280px) {
  .hero__cta {
    display: none;
  }
}

@media (min-width: 1024px) {
  .hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
  }
  .about-cards {
    grid-template-columns: 1fr 1fr;
  }
  .registry-spec {
    grid-template-columns: repeat(6, 1fr);
  }
  .spec-cell {
    border-left: 1px solid var(--border);
  }
  .spec-cell:first-of-type {
    border-left: 0;
  }
  .process-track {
    grid-template-columns: repeat(6, 1fr);
  }
}

/* Full bar with all four zones shown at every desktop width (≥1280);
   hamburger takes over below. */

/* Tablet/desktop nav vs. mobile drawer — full bar on desktop (≥1280),
   clean hamburger below. */
@media (max-width: 1279px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    color: var(--text);
    border: 1px solid var(--border);
    transition: background var(--dur) var(--ease);
  }
  .nav-toggle:hover {
    background: var(--surface-alt);
  }
  .nav-toggle svg {
    width: var(--icon-lg);
    height: var(--icon-lg);
    stroke: currentcolor;
  }
  .site-header__inner {
    gap: var(--space-4);
  }
  .primary-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    margin: 0;
    z-index: 1000;
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    background: var(--surface-opaque);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-xl);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition:
      transform var(--dur) var(--ease),
      opacity var(--dur) var(--ease);
  }
  .primary-nav[data-open="true"] {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .primary-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4) var(--gutter) var(--space-3);
    gap: var(--space-1);
  }
  .primary-nav a {
    width: 100%;
    padding-block: var(--space-3);
    font-size: var(--text-lg);
    border-radius: var(--radius-md);
  }
  /* Active row in the drawer — tinted pill + a clear left accent bar */
  .primary-nav a[aria-current="page"],
  .primary-nav a.is-active {
    background: color-mix(in srgb, var(--accent) 15%, transparent);
    box-shadow: inset 3px 0 0 var(--accent);
  }

  /* Utility actions move into the drawer as full-width rows */
  .header-actions {
    gap: var(--space-2);
    margin-left: auto;
  }
  .header-divider {
    display: none;
  }
  .header-actions .icon-btn,
  .header-actions .btn--outline {
    display: none;
  }
  .nav-drawer-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    padding: var(--space-3) var(--gutter) var(--space-5);
    margin-top: var(--space-2);
    border-top: 1px solid var(--glass-hairline);
  }
  .nav-drawer-actions a {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    min-height: 48px;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-base);
    font-weight: var(--weight-medium);
    color: var(--text-muted);
    border-radius: var(--radius-md);
    transition:
      color var(--dur) var(--ease),
      background var(--dur) var(--ease);
  }
  .nav-drawer-actions a:hover {
    color: var(--text);
    background: var(--surface-alt);
  }
  .nav-drawer-actions svg {
    width: var(--icon-md);
    height: var(--icon-md);
    stroke: currentcolor;
    flex-shrink: 0;
  }
  .nav-drawer-actions svg[fill="currentcolor"] {
    stroke: none;
  }
}

@media (max-width: 480px) {
  .header-actions .btn--latest {
    padding-inline: var(--space-3);
  }
  .brand__sub {
    display: none;
  }
  .hero__stats {
    grid-template-columns: 1fr;
    max-width: 320px;
  }
}

/* Print: keep it legible, drop heavy chrome */
@media print {
  .site-header,
  .carousel__btn,
  .nav-toggle,
  .skip-link {
    display: none;
  }
  body {
    background: #fff;
  }
  .hero,
  .contribute-cta,
  .contact-band,
  .site-footer {
    background: #fff !important;
    color: #000 !important;
  }
  body::before {
    display: none !important;
  }
}

/* ============================================================================
   ░░  GLASSMORPHISM THEME LAYER  ░░
   Sits on top of the base styles. Paints the mesh background, frosts every
   panel, re-themes the formerly-solid-dark sections, and adds motion.
   ========================================================================== */

/* ----------------------------------------------------- MESH BACKDROP ---- */
html {
  background: var(--mesh-base);
}
body {
  background: transparent;
  position: relative;
  min-height: 100vh;
}
/* Fixed colorful mesh that the glass floats over (theme-aware via tokens) */
body::before {
  content: "";
  position: fixed;
  inset: -10vmax;
  z-index: -1;
  background:
    radial-gradient(42vmax 42vmax at 12% 8%, var(--mesh-1), transparent 60%),
    radial-gradient(40vmax 40vmax at 88% 2%, var(--mesh-3), transparent 60%),
    radial-gradient(46vmax 46vmax at 78% 64%, var(--mesh-2), transparent 60%),
    radial-gradient(38vmax 38vmax at 16% 88%, var(--mesh-4), transparent 60%),
    radial-gradient(34vmax 34vmax at 50% 50%, var(--mesh-5), transparent 62%),
    var(--mesh-base);
  animation: meshDrift 32s ease-in-out infinite alternate;
}
@keyframes meshDrift {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  100% {
    transform: translate3d(-2%, -1.5%, 0) scale(1.06);
  }
}
@media (prefers-reduced-motion: reduce) {
  body::before {
    animation: none;
  }
}

/* --------------------------------------------- SHARED GLASS TREATMENT --- */
/* Every floating panel gets blur + a 1px light edge + inner top highlight. */
.site-header,
.edge-card,
.process-step,
.registry-card,
.version-card,
.usecase-card,
.use-card,
.use169-panel,
.option-tile,
.howto-card,
.contributors-card,
.author-card,
.org-card,
.faq-band,
.stat-card,
.qr-panel,
.carousel__btn,
.contribute-cta,
.contact-band,
.site-footer,
.band {
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
}

/* Reusable glass edge: hairline border + soft outer shadow + inner highlight */
.edge-card,
.process-step,
.registry-card,
.version-card,
.usecase-card,
.use-card,
.use169-panel,
.option-tile,
.howto-card,
.contributors-card,
.author-card,
.org-card,
.faq-band,
.stat-card,
.qr-panel,
.contribute-cta,
.contact-band {
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
}

/* Elevation hierarchy: large surfaces float higher than small cards so the
   page reads as layered depth, not one rigid grid of identical boxes. */
.registry-card,
.use169-panel,
.contributors-card,
.contribute-cta,
.contact-band,
.usecase-card--feature {
  box-shadow:
    var(--card-shadow-lg),
    inset 0 1px 0 var(--glass-highlight);
}

/* ----------------------------------------------------------- HEADER ----- */
.site-header {
  background: var(--surface-strong);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 8px 30px -18px rgba(20, 30, 55, 0.5);
}
.primary-nav a:hover {
  background: var(--surface-alt);
}
/* Active/current nav item — tinted accent pill (beats hover via source order) */
.primary-nav a[aria-current="page"],
.primary-nav a.is-active {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}
.primary-nav a[aria-current="page"]:hover,
.primary-nav a.is-active:hover {
  background: color-mix(in srgb, var(--accent) 17%, transparent);
}
.icon-btn:hover {
  background: var(--surface-alt);
}

/* ------------------------------------------------------- THEME TOGGLE --- */
.theme-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
  transition:
    background var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    color var(--dur) var(--ease);
}
.theme-toggle:hover {
  background: var(--surface-strong);
  transform: translateY(-1px);
}
.theme-toggle:hover svg {
  transform: rotate(-18deg) scale(1.08);
}
.theme-toggle:active {
  transform: translateY(0) scale(0.95);
  transition-timing-function: var(--ease-press);
}
.theme-toggle svg {
  width: var(--icon-md);
  height: var(--icon-md);
  stroke: currentcolor;
  transition:
    transform var(--dur-slow) var(--ease),
    opacity var(--dur) var(--ease);
}
.theme-toggle .i-sun {
  display: none;
  color: var(--gold);
}
.theme-toggle .i-moon {
  display: block;
  color: var(--accent-on-light);
}
:root[data-theme="dark"] .theme-toggle .i-sun {
  display: block;
}
:root[data-theme="dark"] .theme-toggle .i-moon {
  display: none;
}

/* --------------------------------------------------------------- HERO --- */
/* Open on the mesh — no solid block. Text + accents are theme-aware. */
.hero {
  background: transparent;
}
.hero h1 .accent {
  color: var(--accent-on-light);
}
.hero__badge {
  background: var(--surface);
  border-color: var(--glass-border);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
}
.hero__badge--accent {
  color: var(--gold);
}
.hero__highlight {
  color: var(--gold);
}
.stat-card,
.qr-panel {
  background: var(--surface);
}

/* QR illustration — theme-aware cells / corners / badge */
.qr-matrix span {
  background: var(--qr-cell);
}
.qr-matrix span.on {
  background: var(--qr-cell-on);
}
.qr-corner {
  border-color: var(--accent-bright);
}
.qr-badge {
  background: var(--qr-badge-bg);
  border-color: var(--accent-bright);
  color: var(--accent-bright);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

/* ----------------------------------------------- BUTTONS / CHIPS -------- */
.btn--outline {
  background: var(--surface);
  border-color: var(--glass-border);
  -webkit-backdrop-filter: blur(var(--blur));
  backdrop-filter: blur(var(--blur));
  box-shadow: inset 0 1px 0 var(--glass-highlight);
}
.btn--ghost-dark {
  background: var(--surface);
  color: var(--text);
  border-color: var(--glass-border);
}
.btn--ghost-dark:hover {
  background: var(--surface-strong);
}
.btn--latest {
  background: var(--accent);
  color: var(--accent-contrast);
}
.btn--latest:hover {
  background: var(--accent-strong);
}
.chip {
  background: var(--surface);
  border-color: var(--border-strong);
}
.chip--accent {
  background: var(--accent-soft);
  color: var(--accent-ink);
  border-color: transparent;
}
.chip--success {
  background: var(--success-soft);
  color: var(--success-ink);
  border-color: transparent;
}
.chip--warning {
  background: var(--warning-soft);
  color: var(--warning-ink);
  border-color: transparent;
}
.code-badge {
  background: var(--success-soft);
  color: var(--success-ink);
  border-color: var(--glass-border);
}

/* Soft-tint edge cards become tinted glass */
.edge-card--soft-info {
  background: var(--accent-soft);
}
.edge-card--soft-success {
  background: var(--success-soft);
}
.edge-card--soft-success .edge-card__label {
  color: var(--success-ink);
}
.feature-list--check svg {
  color: var(--accent);
}

/* --------------------------------------------------------- USE-CASES ---- */
.use-card--more {
  background: var(--surface-alt);
}
.use-card__icon,
.howto-card__icon,
.option-tile__icon,
.contributors-head__icon,
.faq-band__icon,
.contact-band__icon {
  border: 1px solid var(--glass-border);
}
.option-tile {
  background: var(--surface);
}

/* -------------------------------------------------- GRADIENT CTA BAND --- */
.band {
  background: linear-gradient(
    110deg,
    color-mix(in srgb, var(--accent-strong) 90%, transparent),
    color-mix(in srgb, var(--accent) 78%, transparent),
    color-mix(in srgb, var(--accent-bright) 70%, transparent)
  );
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--shadow-lg),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  color: #fff;
}

/* ------------------------------------------ FORMERLY-DARK SECTIONS ------ */
/* Contribute / Contact / Footer now read as deep tinted glass on the mesh */
.contribute-cta {
  background: var(--surface-strong);
  color: var(--text);
}
.contribute-cta p {
  color: var(--text-muted);
}
.contribute-cta__note {
  color: var(--text-subtle);
}

.contact-band {
  background: var(--surface-strong);
  color: var(--text);
}
.contact-band p {
  color: var(--text-muted);
}
.contact-band__icon {
  background: var(--accent-soft);
  color: var(--accent-on-light);
}
.contact-band__body a.mail {
  color: var(--accent-on-light);
}

.site-footer {
  background: var(--surface);
  color: var(--text);
  border-top: 1px solid var(--glass-border);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
}
.footer-brand .brand__name {
  color: var(--text);
}
.footer-brand p {
  color: var(--text-muted);
}
.footer-brand .meta {
  color: var(--text-subtle);
}
.footer-brand .meta a,
.footer-brand .meta b {
  color: var(--accent-on-light);
}
.footer-nav a {
  color: var(--text-muted);
}
.footer-nav a:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--text) 6%, transparent);
}
.footer-bottom {
  border-top: 1px solid var(--glass-border);
  color: var(--text-subtle);
}

/* Mobile nav drawer = solid opaque sheet (no transparency / no blur bleed) */
@media (max-width: 1023px) {
  .primary-nav {
    background: var(--surface-opaque);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    border-bottom: 1px solid var(--glass-border);
  }
  .nav-toggle {
    border-color: var(--glass-border);
    background: var(--surface);
  }
}

/* Nav scrim — semi-opaque overlay behind the open drawer; tap to close */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(3, 10, 22, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
}
.nav-scrim[data-open="true"] {
  opacity: 1;
  pointer-events: auto;
}
@media (min-width: 1280px) {
  .nav-scrim {
    display: none;
  }
}
/* Lock background scroll while the drawer is open */
body.nav-open {
  overflow: hidden;
}
@media (prefers-reduced-motion: reduce) {
  .nav-scrim {
    transition: none;
  }
}

/* ------------------------------------------------- MICRO-INTERACTIONS --- */
/* One restrained, consistent hover: gentle lift + deepened layered shadow. */
.process-step,
.usecase-card,
.use-card,
.howto-card,
.org-card,
.author-card,
.option-tile,
.version-card,
.stat-card,
.use169-panel {
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.process-step:hover,
.usecase-card:hover,
.use-card:hover,
.howto-card:hover,
.org-card:hover,
.option-tile:hover,
.version-card:hover,
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow:
    var(--card-shadow-hover),
    inset 0 1px 0 var(--glass-highlight);
  border-color: color-mix(in srgb, var(--glass-border) 70%, var(--accent) 30%);
}
/* QA: standardize ALL content-card RESTING shadows onto the one multi-layer
   elevation system (was a mix of flat --shadow-sm / --shadow-xs), so resting →
   hover stays within a single soft, tinted shadow language. */
.edge-card,
.process-step,
.usecase-card,
.use-card,
.howto-card,
.faq-band,
.author-card,
.org-card {
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
}
.use-card--more {
  box-shadow: none;
}
/* Smaller list-style cards lift a touch less so the motion feels calibrated. */
.author-card:hover {
  transform: translateY(-2px);
  box-shadow:
    var(--card-shadow-hover),
    inset 0 1px 0 var(--glass-highlight);
}
/* The dashed "And More" tile stays flat — it's a placeholder, not a card. */
.use-card--more {
  background: transparent;
  border: 1px dashed var(--border-strong);
  box-shadow: none;
}
.use-card--more:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--accent);
}

.btn--primary:hover {
  transform: translateY(-2px);
}
.btn {
  transition:
    transform var(--dur) var(--ease),
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

/* ---------------------------------------------------- ENTRANCE REVEAL --- */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    will-change: opacity, transform;
  }
  .reveal.is-in {
    opacity: 1;
    transform: none;
    transition:
      opacity var(--dur-reveal) var(--ease-out),
      transform var(--dur-reveal) var(--ease-out);
  }
  /* Drop the GPU hint once settled so we don't hold layers indefinitely */
  .reveal.is-in {
    will-change: auto;
  }
}

/* ------------------------------------------------ THEME TRANSITION ------ */
/* Applied briefly by JS during a theme switch for a smooth crossfade. */
html.theme-transition,
html.theme-transition * {
  transition:
    background-color 0.45s var(--ease),
    color 0.45s var(--ease),
    border-color 0.45s var(--ease) !important;
}

/* ============================================================================
   ░░  ALL VERSIONS PAGE (versions.html)  ░░
   Reuses the site's glass + brand tokens. Cards are equal-height per row.
   ========================================================================== */
.versions-head {
  padding-bottom: 0;
}
.back-btn {
  display: flex;
  width: fit-content;
  margin-bottom: var(--space-6);
}
.back-btn svg {
  width: 1.15em;
  height: 1.15em;
}
/* Breadcrumb (replaces the standalone Back CTA; crumbs carry the back nav) */
.breadcrumb {
  margin-bottom: var(--space-6);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: var(--text-sm);
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.breadcrumb li + li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-right: 1.5px solid var(--text-subtle);
  border-top: 1.5px solid var(--text-subtle);
  transform: rotate(45deg);
  opacity: 0.55;
  flex-shrink: 0;
}
.breadcrumb a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 32px;
  color: var(--text-muted);
  font-weight: 600;
  transition: color var(--dur) var(--ease-snap);
}
.breadcrumb a:hover {
  color: var(--accent-on-light);
}
.breadcrumb a:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}
.breadcrumb__home svg {
  width: 15px;
  height: 15px;
  stroke: currentcolor;
  transition: transform var(--dur) var(--ease-snap);
}
.breadcrumb__home:hover svg {
  transform: translateX(-3px);
}
.breadcrumb [aria-current="page"] {
  color: var(--text);
  font-weight: 700;
}
.versions-body {
  padding-top: var(--space-4);
}
.versions-eyebrow {
  margin-bottom: var(--space-4);
}
.versions-title {
  font-size: var(--text-5xl);
  font-weight: var(--weight-extra);
  letter-spacing: -0.03em;
}
.versions-lede {
  margin-top: var(--space-4);
  color: var(--text-muted);
  font-size: var(--text-lg);
  line-height: var(--leading-normal);
  max-width: 64ch;
}

/* Equal columns desktop, single column mobile; rows match tallest card */
.versions-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: stretch;
}

.ver-card {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  height: 100%;
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.ver-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(
    120% 90% at 50% -20%,
    var(--glass-highlight),
    transparent 62%
  );
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.ver-card:hover {
  transform: translateY(-4px);
  box-shadow:
    var(--card-shadow-hover),
    inset 0 1px 0 var(--glass-highlight);
  border-color: color-mix(in srgb, var(--glass-border) 70%, var(--accent) 30%);
}
.ver-card:hover::after {
  opacity: 0.55;
}

.ver-card__head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.ver-pill {
  font-family: var(--font-mono);
  font-weight: var(--weight-bold);
  font-size: var(--text-base);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--surface-alt);
  border: 1px solid var(--glass-border);
  color: var(--text);
}
.ver-pill--latest {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: transparent;
}
.ver-date {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-subtle);
}

.ver-card__desc {
  font-weight: var(--weight-semibold);
  color: var(--text);
  font-size: var(--text-md);
}
.ver-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.ver-card__list li {
  display: flex;
  gap: var(--space-3);
  color: var(--text-muted);
  font-size: var(--text-base);
  line-height: var(--leading-snug);
}
.ver-card__list li::before {
  content: "→";
  color: var(--accent-on-light);
  font-weight: var(--weight-bold);
  flex-shrink: 0;
}
.ver-card__list code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--accent-soft);
  color: var(--accent-ink);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
}
.ver-card__more {
  margin-top: auto;
  align-self: flex-start;
}

/* Advisory note — soft warm-to-cool wash card, centered under the version grid */
.ver-note {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  margin: var(--space-8) auto 0;
  max-width: 1224px;
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(
      100deg,
      color-mix(in srgb, var(--warning) 18%, transparent) 0%,
      color-mix(in srgb, var(--text-subtle) 7%, transparent) 48%,
      color-mix(in srgb, var(--accent-bright) 18%, transparent) 100%
    ),
    var(--surface);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
}
.ver-note__icon {
  flex-shrink: 0;
  display: inline-flex;
  color: var(--warning);
  margin-top: 2px;
}
.ver-note__icon svg {
  width: 22px;
  height: 22px;
  stroke: currentcolor;
  fill: none;
}
.ver-note p {
  margin: 0;
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
  text-wrap: pretty;
}

.ver-cta {
  text-align: center;
  margin-top: var(--space-12);
}

@media (min-width: 768px) {
  .versions-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---- Spec strip (current-spec overview module) ---------------------- */
.versions-spec {
  padding-block: var(--space-6) var(--space-10);
}
.spec-strip-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
.spec-strip__caption {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
}

/* Crisp 1px dividers via gap; each cell paints its own surface over the
   hairline so separators show in both axes when columns wrap. */
.spec-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--glass-hairline);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow-lg),
    inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
}
.spec-col {
  position: relative;
  padding: var(--space-8) var(--space-5) var(--space-5);
  /* faint vertical wash of the column colour + the glass surface beneath */
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--c) 9%, transparent),
      transparent 58%
    ),
    var(--surface);
}
/* Solid accent bar, flush to the top edge (consistent thin height) */
.spec-col::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--c);
}
.spec-col__label {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-subtle);
}
.spec-col__value {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
  color: var(--text);
}
/* Brand palette — one solid colour per column */
.spec-col--1 {
  --c: #014daf;
}
.spec-col--2 {
  --c: #0a8754;
}
.spec-col--3 {
  --c: #fec40d;
}
.spec-col--4 {
  --c: #fa8005;
}
.spec-col--5 {
  --c: #01a2fd;
}
.spec-col--6 {
  --c: #d64045;
}

@media (min-width: 600px) {
  .spec-strip {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (min-width: 960px) {
  .spec-strip {
    grid-template-columns: repeat(6, 1fr);
  }
}

/* ============================================================================
   ░░  HOW IT WORKS PAGE (how-it-works.html)  ░░
   ========================================================================== */
/* Section headers with accent bar + hairline rule */
.sec-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--section-head-gap);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--glass-hairline);
}
.sec-head::before {
  content: "";
  flex-shrink: 0;
  width: 5px;
  height: 1.1em;
  border-radius: var(--radius-pill);
  background: var(--accent);
}
.sec-head h2 {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
}
.sec-subtitle {
  margin-top: calc(-1 * var(--space-4));
  margin-bottom: var(--section-head-gap);
  color: var(--text-muted);
  font-size: var(--text-lg);
}

/* ---- Section 1: 6-step horizontal flow with connectors --------------- */
.proc-flow {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: stretch;
}
.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-on-light);
}
.flow-arrow svg {
  width: 24px;
  height: 24px;
  stroke: currentcolor;
  transform: rotate(90deg);
  transition: transform var(--dur) var(--ease);
}
@media (min-width: 1024px) {
  .proc-flow {
    flex-direction: row;
    align-items: stretch;
    gap: var(--space-1);
  }
  .proc-flow .process-step {
    flex: 1 1 0;
    min-width: 0;
  }
  .flow-arrow svg {
    transform: none;
  }
}

/* ---- Section 2: encoding pipeline cards (3 per row) ------------------ */
.pipeline-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: stretch;
}
.pipeline-card {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  height: 100%;
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.pipeline-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(
    120% 90% at 50% -20%,
    var(--glass-highlight),
    transparent 62%
  );
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.pipeline-card:hover {
  transform: translateY(-4px);
  box-shadow:
    var(--card-shadow-hover),
    inset 0 1px 0 var(--glass-highlight);
  border-color: color-mix(in srgb, var(--glass-border) 70%, var(--accent) 30%);
}
.pipeline-card:hover::after {
  opacity: 0.55;
}
.pipeline-card__num {
  font-family: var(--font-mono);
  font-weight: var(--weight-bold);
  font-size: var(--text-sm);
  color: var(--accent-on-light);
}
.pipeline-card h3 {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
}
.pipeline-card p {
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
  font-size: var(--text-base);
}
.pipeline-card .chip {
  margin-top: auto;
  align-self: flex-start;
}

/* ---- Section 3: verification process (4 numbered steps) -------------- */
.vp-flow {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.vp-step {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  flex: 1 1 0;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
  transition:
    transform var(--dur) var(--ease-snap),
    box-shadow var(--dur) var(--ease-snap),
    border-color var(--dur) var(--ease-snap);
}
@media (hover: hover) {
  .vp-step:hover {
    transform: translateY(-4px);
    box-shadow:
      var(--card-shadow-hover),
      inset 0 1px 0 var(--glass-highlight);
    border-color: color-mix(
      in srgb,
      var(--glass-border) 65%,
      var(--accent) 35%
    );
  }
  .vp-step:hover .vp-step__num {
    transform: scale(1.08);
  }
}
.vp-step__num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-md);
  color: #fff;
  background: linear-gradient(150deg, var(--accent), var(--accent-bright));
  box-shadow:
    0 6px 16px -4px var(--accent),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
  transition: transform var(--dur) var(--ease-press);
}
.vp-step p {
  color: var(--text);
  font-size: var(--text-base);
  line-height: var(--leading-snug);
}
.vp-step code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}
.vp-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-on-light);
  padding-left: 44px;
}
.vp-arrow svg {
  width: 22px;
  height: 22px;
  stroke: currentcolor;
  transform: rotate(90deg);
}
@media (min-width: 1024px) {
  .vp-flow {
    flex-direction: row;
    align-items: stretch;
    gap: var(--space-2);
  }
  .vp-step {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    text-align: left;
  }
  .vp-arrow {
    padding-left: 0;
    align-self: center;
  }
  .vp-arrow svg {
    transform: none;
  }
}
/* Staggered entrance — each step rises + scales in just behind the previous */
@media (prefers-reduced-motion: no-preference) {
  .vp-step.reveal {
    opacity: 0;
    transform: translateY(20px) scale(0.96);
    will-change: opacity, transform;
  }
  .vp-step.reveal.is-in {
    opacity: 1;
    transform: none;
    transition:
      opacity var(--dur-slow) var(--ease-out),
      transform 460ms var(--ease-press);
  }
}

/* ---- Section 4: security architecture -------------------------------- */
.signing-callout {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
  padding: clamp(1.5rem, 1rem + 2vw, 2.5rem);
  border-radius: var(--radius-xl);
  background: var(--surface-strong);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow-lg),
    inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  backdrop-filter: blur(var(--blur-strong)) saturate(160%);
}
.signing-callout__icon {
  flex-shrink: 0;
  width: var(--icon-tile);
  height: var(--icon-tile);
  border-radius: var(--icon-tile-radius);
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent-on-light);
  border: 1px solid var(--glass-border);
}
.signing-callout__icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
  stroke: currentcolor;
}
.signing-callout__title {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
}
.signing-callout__attr {
  margin-top: var(--space-3);
  color: var(--text-subtle);
  font-style: italic;
  font-size: var(--text-sm);
}

/* Stacked-nav carousel: arrows sit BELOW the cards (centered row) so cards keep
   their full width and arrows never overlap any card at any width. Swipe/scroll
   stays on the track. Used by the security carousel + the home "Where" carousel. */
.sec-carousel {
  margin-top: var(--space-8);
}
.sec-carousel,
.carousel--stacked {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-4);
}
.sec-carousel .carousel__viewport,
.carousel--stacked .carousel__viewport {
  order: -1;
  flex-basis: 100%;
  width: 100%;
}
.sec-carousel .carousel__btn,
.carousel--stacked .carousel__btn {
  position: static;
  top: auto;
  left: auto;
  right: auto;
  transform: none;
}

/* Two info cards */
.info-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-10);
  align-items: stretch;
}
.info-card {
  position: relative;
  isolation: isolate;
  height: 100%;
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
}
.info-card h3 {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-5);
}
.info-card__row {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-top: 1px solid var(--glass-hairline);
}
.info-card__row:first-of-type {
  border-top: 0;
}
.info-card__num {
  font-family: var(--font-mono);
  font-weight: var(--weight-bold);
  font-size: var(--text-sm);
  color: var(--accent-on-light);
  min-width: 26px;
}
.info-card__key {
  font-family: var(--font-mono);
  font-weight: var(--weight-semibold);
  color: var(--text);
}
.info-card__desc {
  color: var(--text-muted);
  font-size: var(--text-sm);
}
.info-card__algo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
}
.info-card__algo .code-badge {
  font-size: var(--text-sm);
}

@media (min-width: 600px) {
  .pipeline-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (min-width: 900px) {
  .pipeline-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (min-width: 768px) {
  .info-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================================================
   ░░  USE CLAIM 169 — DEVELOPER RESOURCES PAGE (use-claim-169.html)  ░░
   Accent-driven cards: solid top bar, tinted icon tile, badges, tags, CTA.
   Per-card colour set via inline --c; --c-ink blends toward --text so accent
   text stays legible in BOTH themes automatically.
   ========================================================================== */
.dev-section {
  padding-block: var(--section-y);
}
.dev-section + .dev-section {
  padding-top: 0;
}
.dev-head {
  margin-bottom: var(--space-8);
}
.dev-head h2 {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
}
.dev-head p {
  margin-top: var(--space-3);
  color: var(--text-muted);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  max-width: 70ch;
}

.dev-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: stretch;
}

.dev-card {
  --c-ink: color-mix(in srgb, var(--c), var(--text) 34%);
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  height: 100%;
  padding: var(--space-8) var(--space-6) var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.dev-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(
    120% 90% at 50% -20%,
    var(--glass-highlight),
    transparent 62%
  );
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.dev-card:hover {
  transform: translateY(-4px);
  box-shadow:
    var(--card-shadow-hover),
    inset 0 1px 0 var(--glass-highlight);
  border-color: color-mix(in srgb, var(--glass-border) 60%, var(--c) 40%);
}
.dev-card:hover::after {
  opacity: 0.5;
}
/* Solid accent bar, flush to the very top edge */
.dev-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--c);
  z-index: 1;
}

.dev-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}
.dev-card__icon {
  width: var(--icon-tile);
  height: var(--icon-tile);
  border-radius: var(--icon-tile-radius);
  flex-shrink: 0;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--c) 16%, transparent);
  color: var(--c-ink);
  border: 1px solid color-mix(in srgb, var(--c) 22%, transparent);
}
.dev-card__icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
  stroke: currentcolor;
}
.dev-card__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: flex-end;
}
.dev-badge {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  white-space: nowrap;
}
.dev-badge--cat {
  background: color-mix(in srgb, var(--c) 16%, transparent);
  color: var(--c-ink);
}
.dev-badge--stable,
.dev-badge--live {
  background: var(--success-soft);
  color: var(--success-ink);
}
.dev-badge--beta {
  background: var(--warning-soft);
  color: var(--warning-ink);
}

.dev-card h3 {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
}
.dev-card__desc {
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
  font-size: var(--text-base);
}
.dev-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.dev-tag {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--c) 12%, transparent);
  color: var(--c-ink);
}
.dev-cta {
  margin-top: auto;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  background: var(--c);
  color: var(--c-on, #fff);
  border: 1px solid transparent;
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    filter var(--dur) var(--ease);
}
.dev-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px -8px var(--c);
  filter: brightness(1.04);
}
.dev-cta svg {
  width: 16px;
  height: 16px;
  stroke: currentcolor;
}

@media (min-width: 600px) {
  .dev-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (min-width: 980px) {
  .dev-grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Compact "coming soon" cards (SDKs + UI Components) — equal-size grid,
   identity only (icon + name) + a neutral Coming soon badge. */
.dev-grid--soon {
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: var(--space-4);
}
.dev-card--soon {
  flex-direction: row;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
}
/* Inline "coming soon" placeholder tile (e.g. playgrounds) — dashed + centered,
   reads as upcoming and sits as a full sibling card in the grid. */
.dev-card--comingsoon {
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-3);
  border-style: dashed;
  background: color-mix(in srgb, var(--text) 3%, transparent);
}
.dev-card--comingsoon::before {
  display: none;
}
.dev-card--comingsoon .dev-card__icon {
  background: color-mix(in srgb, var(--text) 7%, transparent);
  color: var(--text-muted);
}
.dev-card--comingsoon h3 {
  font-size: var(--text-lg);
}
.dev-card--comingsoon .dev-card__desc {
  margin: 0;
  color: var(--text-subtle);
}
.dev-card--comingsoon:hover {
  transform: none;
  box-shadow: var(--card-shadow);
  border-color: var(--glass-border);
}
.dev-card--soon .dev-card__name {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: flex-start;
}
.dev-card--soon h3 {
  font-size: var(--text-md);
}
.dev-card--soon .dev-badge--soon {
  margin-top: var(--space-1);
}
.dev-badge--soon {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: 3px var(--space-3);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--text) 8%, transparent);
  color: var(--text-muted);
  white-space: nowrap;
}
.dev-badge--soon::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c);
  flex-shrink: 0;
}
/* coming-soon cards read as upcoming: no lift, slightly recessed */
.dev-card--soon:hover {
  transform: none;
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
  border-color: var(--glass-border);
}

@media (prefers-reduced-motion: reduce) {
  .dev-card:hover,
  .dev-cta:hover {
    transform: none;
  }
  .dev-card::after {
    display: none;
  }
}

/* ============================================================================
   ░░  RESOURCES PAGE (resources.html)  ░░
   Filterable pool of talks / podcasts / articles / webinars. Per-card accent
   via inline --c (bar, media tint, pills, CTA); --c-ink blends to --text.
   ========================================================================== */
.res-toolbar {
  position: sticky;
  top: var(--header-h);
  z-index: 50;
  padding-block: var(--space-4);
  margin-bottom: var(--section-y);
  background: var(--surface-strong);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  border-block: 1px solid var(--glass-hairline);
}
.res-toolbar__row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
}
.res-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.res-tab {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 42px;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--surface);
  color: var(--text-muted);
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  transition:
    background var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}
.res-tab:hover {
  color: var(--text);
  background: var(--surface-strong);
}
.res-tab[aria-selected="true"] {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: transparent;
}
.res-tab__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  opacity: 0.75;
}
.res-tab[aria-selected="true"] .res-tab__count {
  opacity: 0.9;
}

.res-search {
  position: relative;
  flex-shrink: 0;
}
.res-search svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  stroke: var(--text-subtle);
  pointer-events: none;
}
.res-search input {
  min-height: 42px;
  width: 240px;
  max-width: 100%;
  padding: 0 var(--space-4) 0 38px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  background: var(--surface-opaque);
  color: var(--text);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-xs);
  transition:
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}
.res-search input::placeholder {
  color: var(--text-subtle);
}
.res-search input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
}

.res-topics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
  align-items: center;
}
.res-topics__label {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-subtle);
  margin-right: var(--space-1);
}
.res-chip {
  min-height: 34px;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  transition:
    background var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.res-chip:hover {
  color: var(--text);
}
.res-chip[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--accent-ink);
  border-color: transparent;
}

/* Shared media block + pills (used by featured + cards) */
.res-media {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  background:
    repeating-linear-gradient(
      135deg,
      color-mix(in srgb, var(--c) 13%, transparent) 0 10px,
      transparent 10px 20px
    ),
    color-mix(in srgb, var(--c) 10%, var(--surface));
  color: var(--c-ink);
}
.res-media__glyph {
  width: 44px;
  height: 44px;
  stroke: currentcolor;
  opacity: 0.9;
}
.res-media--cover {
  background: var(--surface-strong);
}
.res-media--cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.res-play {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--c);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.res-play svg {
  width: 24px;
  height: 24px;
  margin-left: 3px;
  fill: currentcolor;
  stroke: none;
}
.res-dur {
  position: absolute;
  right: var(--space-3);
  bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: #fff;
  background: rgba(8, 12, 22, 0.78);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
}
.res-cal {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1;
  color: var(--c-ink);
}
.res-cal__month {
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}
.res-cal__day {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--weight-extra);
}

.res-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  white-space: nowrap;
}
.res-pill svg {
  width: var(--icon-xs);
  height: var(--icon-xs);
  stroke: currentcolor;
}
.res-pill--type {
  background: color-mix(in srgb, var(--c) 16%, transparent);
  color: var(--c-ink);
}
.res-pill--status {
}
.res-pill--upcoming,
.res-pill--live {
  background: var(--success-soft);
  color: var(--success-ink);
}
.res-pill--recorded {
  background: var(--surface-alt);
  color: var(--text-subtle);
}
.res-pill--featured {
  background: var(--accent-soft);
  color: var(--accent-ink);
}

/* Results grid + card */
.res-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: stretch;
}
.res-card {
  --c-ink: color-mix(in srgb, var(--c), var(--text) 34%);
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  height: 100%;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow),
    inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.res-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--c);
  z-index: 2;
}
.res-card:hover {
  transform: translateY(-4px);
  box-shadow:
    var(--card-shadow-hover),
    inset 0 1px 0 var(--glass-highlight);
  border-color: color-mix(in srgb, var(--glass-border) 60%, var(--c) 40%);
}
.res-card__pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.res-card h3 {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  line-height: var(--leading-snug);
}
.res-card__meta {
  color: var(--text-subtle);
  font-size: var(--text-sm);
  font-family: var(--font-mono);
}
.res-cta {
  margin-top: auto;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  background: var(--c);
  color: var(--c-on, #fff);
  border: 1px solid transparent;
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    filter var(--dur) var(--ease);
}
.res-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px -8px var(--c);
  filter: brightness(1.04);
}
.res-cta svg {
  width: 16px;
  height: 16px;
  stroke: currentcolor;
}

/* Featured (All view only) */
.res-featured[hidden] {
  display: none;
}
.res-featured {
  --c-ink: color-mix(in srgb, var(--c), var(--text) 34%);
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--card-shadow-lg),
    inset 0 1px 0 var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
}
.res-featured::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--c);
  z-index: 2;
}
.res-featured__media {
  aspect-ratio: 1 / 1;
}
.res-featured__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.res-featured__pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.res-featured h2 {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
}
.res-featured__desc {
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}
.res-featured__meta {
  color: var(--text-subtle);
  font-size: var(--text-sm);
  font-family: var(--font-mono);
}

/* Load more + empty state */
.res-loadmore-wrap {
  text-align: center;
  margin-top: var(--space-10);
}
.res-empty {
  text-align: center;
  padding: var(--space-16) var(--space-4);
  color: var(--text-muted);
}
.res-empty svg {
  width: 48px;
  height: 48px;
  stroke: var(--text-subtle);
  margin: 0 auto var(--space-5);
  display: block;
}
.res-empty p {
  font-size: var(--text-lg);
}

/* Coming-soon state (one per tab) — glass card matching the site */
.res-soon {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-2);
  padding: clamp(2.5rem, 2rem + 4vw, 4.5rem) var(--space-5);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--card-shadow);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
}
.res-soon__icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  display: grid;
  place-items: center;
  margin-bottom: var(--space-3);
  background: var(--accent-soft);
  color: var(--accent-on-light);
}
.res-soon__icon svg {
  width: 30px;
  height: 30px;
  stroke: currentcolor;
}
.res-soon__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-xl);
  color: var(--text);
}
.res-soon__line {
  color: var(--text-muted);
  font-size: var(--text-md);
}

@media (prefers-reduced-motion: no-preference) {
  .res-card {
    animation: resIn 0.4s var(--ease) both;
  }
}
@keyframes resIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .res-card:hover,
  .res-cta:hover,
  .res-tab:hover {
    transform: none;
  }
}

@media (min-width: 640px) {
  .res-grid {
    grid-template-columns: 1fr 1fr;
  }
  .res-featured {
    grid-template-columns: 260px 1fr;
    align-items: center;
  }
}
@media (min-width: 980px) {
  .res-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .res-featured {
    grid-template-columns: 300px 1fr;
  }
}

/* ============================================================================
   ░░  FAQ PAGE (faqs.html)  ░░
   Category-grouped accordions with sticky jump-nav, live search, expand-all.
   Per-category accent via inline --c (icon badge, item left bar, nav active).
   ========================================================================== */
.faq-toolbar {
  position: sticky;
  top: var(--header-h);
  z-index: 50;
  padding-block: var(--space-4);
  margin-bottom: var(--section-y);
  background: var(--surface-strong);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  border-block: 1px solid var(--glass-hairline);
}
.faq-toolbar__row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
}
.faq-search {
  position: relative;
  flex: 1;
  min-width: 220px;
}
.faq-search svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  stroke: var(--text-subtle);
  pointer-events: none;
}
.faq-search input {
  width: 100%;
  min-height: 44px;
  padding: 0 var(--space-4) 0 38px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  background: var(--surface-opaque);
  color: var(--text);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-xs);
  transition:
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}
.faq-search input::placeholder {
  color: var(--text-subtle);
}
.faq-search input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
}
.faq-expand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--surface);
  color: var(--accent-on-light);
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  transition:
    background var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}
.faq-expand:hover {
  background: var(--surface-strong);
  transform: translateY(-1px);
}
.faq-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}
.faq-nav a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 38px;
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  transition:
    background var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.faq-nav a::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c);
  flex-shrink: 0;
}
.faq-nav a:hover {
  color: var(--text);
  border-color: var(--text-subtle);
}
.faq-nav a[aria-current="true"] {
  background: color-mix(in srgb, var(--c) 16%, transparent);
  color: var(--text);
  border-color: color-mix(in srgb, var(--c) 55%, transparent);
}

#faq-cats {
  scroll-margin-top: calc(var(--header-h) + 132px);
}
.faq-cat {
  margin-bottom: var(--space-8);
  scroll-margin-top: calc(var(--header-h) + 132px);
}
.faq-cathead {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
.faq-cathead__icon {
  width: var(--icon-tile);
  height: var(--icon-tile);
  border-radius: var(--icon-tile-radius);
  flex-shrink: 0;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--c) 16%, transparent);
  color: color-mix(in srgb, var(--c), var(--text) 28%);
  border: 1px solid color-mix(in srgb, var(--c) 24%, transparent);
}
.faq-cathead__icon svg {
  width: var(--icon-lg);
  height: var(--icon-lg);
  stroke: currentcolor;
}
.faq-cathead h2 {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
}

.faq-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.faq-item {
  border: 1px solid var(--glass-border);
  border-left: 3px solid var(--c);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--card-shadow);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
  scroll-margin-top: calc(var(--header-h) + 96px);
  overflow: hidden;
}
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  text-align: left;
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-md);
  color: var(--text);
  cursor: pointer;
  transition: background var(--dur) var(--ease);
}
.faq-q:hover {
  background: color-mix(in srgb, var(--c) 7%, transparent);
}
.faq-q:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}
.faq-q__text {
  flex: 1;
}
.faq-chev {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  stroke: var(--text-subtle);
  transition: transform var(--dur) var(--ease);
}
.faq-q[aria-expanded="true"] .faq-chev {
  transform: rotate(180deg);
  color: var(--text);
}
.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-slow) var(--ease);
}
.faq-item[data-open="true"] .faq-a {
  grid-template-rows: 1fr;
}
.faq-a__inner {
  overflow: hidden;
  min-height: 0;
}
.faq-a__pad {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}
.faq-a__pad p {
  max-width: var(--measure);
}
.faq-a__pad ul {
  margin-top: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.faq-a__pad li {
  display: flex;
  gap: var(--space-3);
}
.faq-a__pad li::before {
  content: "";
  margin-top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c);
  flex-shrink: 0;
}
.faq-a__pipe {
  margin-top: var(--space-3);
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text);
  background: color-mix(in srgb, var(--c) 12%, transparent);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  max-width: 100%;
}

.faq-empty {
  text-align: center;
  padding: var(--space-16) var(--space-4);
  color: var(--text-muted);
}
.faq-empty svg {
  width: 48px;
  height: 48px;
  stroke: var(--text-subtle);
  margin: 0 auto var(--space-5);
  display: block;
}
.faq-empty p {
  font-size: var(--text-lg);
}

@media (prefers-reduced-motion: reduce) {
  .faq-a {
    transition: none;
  }
  .faq-chev {
    transition: none;
  }
  .faq-expand:hover {
    transform: none;
  }
}

/* ============================================================================
   ░░  COHESIVE MOTION LAYER  ░░
   One personality across the whole site: quick (var(--dur) ≈220ms), eased,
   transform/opacity only. Fully neutralised under prefers-reduced-motion.
   ========================================================================== */

/* ---- Buttons: unified lift + shadow deepen + icon nudge ---------------- */
.btn {
  transition:
    transform var(--dur) var(--ease-snap),
    background var(--dur) var(--ease-snap),
    border-color var(--dur) var(--ease-snap),
    box-shadow var(--dur) var(--ease-snap),
    color var(--dur) var(--ease-snap);
}
.btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-lg);
}
.btn--primary:hover {
  box-shadow:
    var(--shadow-accent),
    0 14px 30px -8px var(--accent);
}
.btn--outline:hover,
.btn--ghost-dark:hover {
  box-shadow: var(--shadow-md);
}
.btn svg {
  transition: transform var(--dur) var(--ease-snap);
}
.btn:hover svg {
  transform: translateX(3px);
}
/* GitHub glyph (filled, not an arrow) shouldn't slide */
.btn:hover svg[fill="currentcolor"] {
  transform: none;
}
/* Tactile press — quick spring-y scale-down, the key to the "physical" feel */
.btn:active {
  transform: scale(0.97);
  transition-timing-function: var(--ease-press);
  transition-duration: var(--dur-fast);
}
.dev-cta:active,
.res-cta:active,
.arrow-link:active,
.collapse-btn:active,
.members-toggle:active,
.faq-expand:active {
  transform: scale(0.97);
  transition-timing-function: var(--ease-press);
  transition-duration: var(--dur-fast);
}

/* ---- Primary CTA: one quiet living detail — a slow, soft sheen sweep ---- */
@media (prefers-reduced-motion: no-preference) {
  .btn--primary {
    position: relative;
    overflow: hidden;
    isolation: isolate;
  }
  .btn--primary > * {
    position: relative;
    z-index: 2;
  }
  .btn--primary::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: -60%;
    width: 45%;
    background: linear-gradient(
      100deg,
      transparent,
      rgba(255, 255, 255, 0.28),
      transparent
    );
    transform: skewX(-18deg);
    pointer-events: none;
    z-index: 1;
    animation: ctaSheen 7s ease-in-out 2s infinite;
  }
  @keyframes ctaSheen {
    0% {
      left: -60%;
    }
    18% {
      left: 130%;
    }
    100% {
      left: 130%;
    }
  }
}

/* ---- Icon buttons, theme toggle, brand: subtle tactile lift ------------ */
.icon-btn {
  transition:
    background var(--dur) var(--ease),
    color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}
.icon-btn:hover {
  transform: translateY(-2px);
}
.theme-toggle:hover {
  transform: translateY(-2px) scale(1.04);
}
.brand {
  transition: transform var(--dur) var(--ease);
}
.brand:hover {
  transform: translateY(-1px);
}

/* ════════════════════════════════════════════════════════════════════════
   ICON MOTION — by role. Reuses --ease-snap / --ease-press / --dur tokens.
   Transform + opacity (and stroke-dashoffset) only → GPU-friendly, no layout
   shift, click targets never move. All gated on hover-capable devices and
   prefers-reduced-motion where decorative.
   ════════════════════════════════════════════════════════════════════════ */

/* — Toggle/state: hamburger ⇄ X morph (driven by aria-expanded) — */
.burger line {
  transform-box: fill-box;
  transform-origin: center;
  transition:
    transform var(--dur) var(--ease-snap),
    opacity var(--dur-fast) var(--ease-snap);
}
.nav-toggle[aria-expanded="true"] .burger__top {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .burger__mid {
  opacity: 0;
  transform: scaleX(0.4);
}
.nav-toggle[aria-expanded="true"] .burger__bot {
  transform: translateY(-6px) rotate(-45deg);
}

/* — Button/link icons: snappier curve on the existing arrow nudges — */
.arrow-link svg {
  transition: transform var(--dur) var(--ease-snap);
}
@media (hover: hover) {
  .arrow-link:hover svg {
    transform: translateX(4px);
  }
  /* External-link icons (the up-right glyph) nudge up-and-right instead */
  .arrow-link[target="_blank"]:hover svg,
  .hero__badge[target="_blank"]:hover svg {
    transform: translate(3px, -3px);
  }
}
.hero__badge svg {
  transition: transform var(--dur) var(--ease-snap);
}
/* keep the gap stable so text doesn't reflow — nudge the icon, not the gap */
.arrow-link:hover {
  gap: var(--space-2);
}

/* — Feature/section icons: scale-in on scroll-reveal, staggered with card — */
@media (prefers-reduced-motion: no-preference) {
  .reveal .process-step__badge,
  .reveal .howto-card__icon,
  .reveal .dev-card__icon,
  .reveal.process-step .process-step__badge,
  .reveal.howto-card .howto-card__icon,
  .reveal.dev-card .dev-card__icon,
  .reveal .use-card__icon,
  .reveal .usecase-card .usecase-icon,
  .reveal .pipeline-card__icon,
  .reveal .vp-step__icon {
    opacity: 0;
    transform: scale(0.85);
  }
  .reveal.is-in .process-step__badge,
  .reveal.is-in .howto-card__icon,
  .reveal.is-in .dev-card__icon,
  .reveal.is-in .use-card__icon,
  .reveal.is-in .usecase-icon,
  .reveal.is-in .pipeline-card__icon,
  .reveal.is-in .vp-step__icon {
    opacity: 1;
    transform: scale(1);
    transition:
      opacity var(--dur) var(--ease-out) 120ms,
      transform 360ms var(--ease-press) 120ms;
  }
}

/* — Feature icons: one-shot pop when the card is hovered (interactive cards) — */
@media (hover: hover) {
  .process-step__badge,
  .howto-card__icon,
  .dev-card__icon,
  .use-card__icon,
  .cta-card__icon {
    transition:
      transform var(--dur) var(--ease-press),
      background var(--dur) var(--ease-snap),
      color var(--dur) var(--ease-snap);
  }
  .process-step:hover .process-step__badge,
  .howto-card:hover .howto-card__icon,
  .dev-card:hover:not(.dev-card--soon):not(.dev-card--comingsoon)
    .dev-card__icon,
  .use-card:hover .use-card__icon,
  .cta-card:hover .cta-card__icon {
    transform: scale(1.1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .burger line {
    transition: none;
  }
  .arrow-link svg,
  .hero__badge svg {
    transition: none;
  }
  .arrow-link:hover svg,
  .arrow-link[target="_blank"]:hover svg,
  .hero__badge[target="_blank"]:hover svg {
    transform: none;
  }
  .reveal .process-step__badge,
  .reveal .howto-card__icon,
  .reveal .dev-card__icon,
  .reveal .use-card__icon,
  .reveal .usecase-icon,
  .reveal .pipeline-card__icon,
  .reveal .vp-step__icon {
    opacity: 1;
    transform: none;
  }
  .process-step:hover .process-step__badge,
  .howto-card:hover .howto-card__icon,
  .dev-card:hover .dev-card__icon,
  .use-card:hover .use-card__icon,
  .cta-card:hover .cta-card__icon {
    transform: none;
  }
}

/* — Primary nav: dividers handle separation; no underline ------------- */
.primary-nav a {
  position: relative;
}

/* ---- Anchor-scroll targets: offset under sticky header + arrival flash --- */
#contributors,
#point-of-contact {
  scroll-margin-top: calc(var(--header-h) + 20px);
}
#point-of-contact {
  border-radius: var(--radius-sm);
}
@media (prefers-reduced-motion: no-preference) {
  #contributors:target,
  #point-of-contact:target {
    animation: targetFlash 1.1s var(--ease);
  }
  @keyframes targetFlash {
    0% {
      box-shadow:
        0 0 0 3px var(--accent),
        0 0 0 7px var(--accent-soft-2);
    }
    100% {
      box-shadow:
        0 0 0 3px transparent,
        0 0 0 7px transparent;
    }
  }
}

/* ---- Carousel arrows: lift + glow on hover ----------------------------- */
.carousel__btn {
  transition:
    background var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    color var(--dur) var(--ease);
}
.carousel__btn:hover:not([disabled]) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--accent-on-light);
}
.carousel__btn:active:not([disabled]) {
  transform: translateY(0);
}

/* ---- Footer links: smooth colour + gentle slide ------------------------ */
.footer-col a {
  transition:
    color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}
.footer-col a:hover {
  transform: translateX(4px);
}
.footer-brand .meta a {
  transition: color var(--dur) var(--ease);
}

/* ---- Glass sheen: faint highlight sweeps onto the surface on hover ------ */
.process-step,
.usecase-card,
.use-card,
.howto-card,
.org-card,
.option-tile,
.stat-card,
.cta-card {
  position: relative;
  isolation: isolate;
}
.process-step::after,
.usecase-card::after,
.use-card::after,
.howto-card::after,
.org-card::after,
.option-tile::after,
.stat-card::after,
.cta-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(
    120% 90% at 50% -20%,
    var(--glass-highlight),
    transparent 62%
  );
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.process-step:hover::after,
.usecase-card:hover::after,
.use-card:hover::after,
.howto-card:hover::after,
.org-card:hover::after,
.option-tile:hover::after,
.stat-card:hover::after,
.cta-card:hover::after {
  opacity: 0.55;
}
.use-card--more::after {
  display: none;
}

/* ---- Header: shadow deepens once the page is scrolled ------------------ */
.site-header {
  transition:
    box-shadow var(--dur) var(--ease),
    background var(--dur) var(--ease);
}
.site-header.is-scrolled {
  box-shadow: var(--shadow-md);
  background: var(--surface-strong);
}

/* ---- Reduced motion: strip every transform-based flourish -------------- */
@media (prefers-reduced-motion: reduce) {
  .btn:hover,
  .btn:hover svg,
  .icon-btn:hover,
  .theme-toggle:hover,
  .brand:hover,
  .carousel__btn:hover:not([disabled]),
  .footer-col a:hover {
    transform: none;
  }
  .process-step::after,
  .usecase-card::after,
  .use-card::after,
  .howto-card::after,
  .org-card::after,
  .option-tile::after,
  .stat-card::after,
  .cta-card::after {
    display: none;
  }
}

/* ============================================================================
   ░░  CARD COLOUR-CODING — solid accent bar across the top edge  ░░
   Restored per the approved design. Applies to the landing-page card family
   (the detail-page cards already carry their own --c bars). Theme-agnostic:
   the bar is a solid palette colour that reads on both light and dark glass.
   ========================================================================== */
.process-step,
.usecase-card,
.use-card,
.howto-card,
.org-card,
.stat-card {
  position: relative;
  overflow: hidden; /* clip the bar to the card's rounded corners */
}
.process-step::before,
.usecase-card::before,
.use-card::before,
.howto-card::before,
.org-card::before,
.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--bar, var(--accent));
  z-index: 3;
}
/* The dashed "And more…" carousel tile carries no bar */
.use-card--more::before {
  display: none;
}

/* Brand palette cycle (deep blue → green → yellow → orange → light blue → red) */
.process-step:nth-child(6n + 1) {
  --bar: #014daf;
}
.process-step:nth-child(6n + 2) {
  --bar: #0a8754;
}
.process-step:nth-child(6n + 3) {
  --bar: #fec40d;
}
.process-step:nth-child(6n + 4) {
  --bar: #fa8005;
}
.process-step:nth-child(6n + 5) {
  --bar: #01a2fd;
}
.process-step:nth-child(6n + 6) {
  --bar: #d64045;
}

.usecase-card:nth-child(3n + 1) {
  --bar: #014daf;
}
.usecase-card:nth-child(3n + 2) {
  --bar: #0a8754;
}
.usecase-card:nth-child(3n + 3) {
  --bar: #fa8005;
}
.usecase-card--feature {
  --bar: #01a2fd;
}

.use-card:nth-child(4n + 1) {
  --bar: #01a2fd;
}
.use-card:nth-child(4n + 2) {
  --bar: #0a8754;
}
.use-card:nth-child(4n + 3) {
  --bar: #fec40d;
}
.use-card:nth-child(4n + 4) {
  --bar: #fa8005;
}

.howto-card:nth-child(3n + 1) {
  --bar: #014daf;
}
.howto-card:nth-child(3n + 2) {
  --bar: #0a8754;
}
.howto-card:nth-child(3n + 3) {
  --bar: #fa8005;
}

.org-card:nth-child(6n + 1) {
  --bar: #014daf;
}
.org-card:nth-child(6n + 2) {
  --bar: #0a8754;
}
.org-card:nth-child(6n + 3) {
  --bar: #fec40d;
}
.org-card:nth-child(6n + 4) {
  --bar: #fa8005;
}
.org-card:nth-child(6n + 5) {
  --bar: #01a2fd;
}
.org-card:nth-child(6n + 6) {
  --bar: #d64045;
}

.stat-card:nth-child(3n + 1) {
  --bar: #01a2fd;
}
.stat-card:nth-child(3n + 2) {
  --bar: #fec40d;
}
.stat-card:nth-child(3n + 3) {
  --bar: #0a8754;
}

/* ============================================================================
   ░░  RESOURCES TEASER (home #resources)  ░░  + anchor scroll offset
   ========================================================================== */
/* Sticky-header-aware anchor offset for all in-page section targets */
main > section[id],
#faq,
#resources,
#contributors,
#point-of-contact {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.res-teaser {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5) var(--space-8);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--card-shadow);
  padding: clamp(1.25rem, 1rem + 1.4vw, 2rem);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
}
.res-teaser__body {
  flex: 1;
  min-width: 260px;
}
.res-teaser__body .eyebrow {
  margin-bottom: var(--space-3);
}
.res-teaser__body h2 {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
}
.res-teaser__body p {
  margin-top: var(--space-2);
  color: var(--text-muted);
  max-width: 60ch;
  line-height: var(--leading-normal);
}
.res-teaser__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}
.res-teaser__chips .chip {
  gap: var(--space-2);
}
.res-teaser__chips svg {
  width: var(--icon-xs);
  height: var(--icon-xs);
  stroke: currentcolor;
  color: var(--accent-on-light);
}
.res-teaser__cta {
  flex-shrink: 0;
}

/* ============================================================================
   ░░  SCROLL PERFORMANCE  ░░
   backdrop-filter is the #1 cause of janky scrolling in Chrome — every blurred
   element re-samples the backdrop each frame. Surfaces are now near-opaque, so
   the many static cards no longer need it. Disable it globally and re-enable
   ONLY on the few sticky bars that actually overlap scrolling content (where a
   little blur is worth it and there's just one of each on screen).
   ========================================================================== */
*,
*::before,
*::after {
  -webkit-backdrop-filter: none !important;
  backdrop-filter: none !important;
}
.site-header,
.vl-toolbar,
.faq-toolbar,
.res-toolbar,
.rn-mini,
.ver-note {
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(150%) !important;
  backdrop-filter: blur(var(--blur-strong)) saturate(150%) !important;
}

/* ============================================================================
   ░░  A11Y QUICK WINS (audit follow-up)  ░░
   ========================================================================== */
/* 1. Dark-mode contrast fixes — the footer/reskin block was leaking light-mode
   tokens (slate #3b4d68, deep-blue #014daf) onto dark surfaces. Override on
   the dark theme only, so light mode is untouched. */
[data-theme="dark"] .footer-nav a {
  color: #aab4c5 !important;
} /* ~7.8:1 on dark footer */
[data-theme="dark"] .footer-nav a:hover {
  color: #ffffff !important;
}
[data-theme="dark"] .arrow-link {
  color: #5cbcff !important;
} /* bright accent ~6.7:1 on dark cards */

/* 2. Small-text contrast — darken the code-badge green for AA in LIGHT mode
   only; dark mode keeps its light-mint --success-ink (was being overridden). */
[data-theme="light"] .code-badge {
  color: #0a5c3f;
}

/* 3. Mobile readability — lift body to 16px (the comfortable floor). */
@media (max-width: 600px) {
  :root {
    --text-base: 1rem;
  }
}

/* 4. Touch targets — give in-content interactive items a ≥44px tap height on
   touch/small screens (desktop mouse targets stay at their tuned size). */
@media (max-width: 1024px) {
  .footer-nav a {
    min-height: 44px;
  }
  .arrow-link {
    min-height: 44px;
  }
  .vl-chip {
    min-height: 44px;
  }
}

.vl-loading {
  color: var(--text-subtle);
  padding: var(--space-8) 0;
  text-align: center;
}

/* ===== Claim 169 QR-scanner loader — shown until the version cards render =====
       Reuses the hero QR's visual language (corner brackets, accent matrix, scan
       beam, 169 badge) in a compact, continuously-looping form. Injected by
       versions-list.js → showLoading(); replaced when render/empty/error fires. */
.vl-loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  padding: clamp(var(--space-10), 8vw, var(--space-16)) var(--space-4);
}
.vl-loader__stage {
  position: relative;
  width: 172px;
  height: 172px;
  display: grid;
  place-items: center;
  padding: 26px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--glass-border);
}
.vl-loader__matrix {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 5px;
  width: 100%;
  height: 100%;
}
.vl-loader__matrix i {
  border-radius: 2px;
  background: color-mix(in srgb, var(--text-subtle) 16%, transparent);
}
.vl-loader__matrix i.on {
  background: var(--accent-bright);
  animation: vl-cell 1.8s ease-in-out infinite;
  animation-delay: calc(var(--r, 0) * 0.12s);
}
@keyframes vl-cell {
  0%,
  100% {
    opacity: 0.32;
  }
  50% {
    opacity: 1;
  }
}

.vl-loader__corner {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 2.5px solid var(--accent-bright);
}
.vl-loader__corner--tl {
  top: 12px;
  left: 12px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: 6px;
}
.vl-loader__corner--tr {
  top: 12px;
  right: 12px;
  border-left: 0;
  border-bottom: 0;
  border-top-right-radius: 6px;
}
.vl-loader__corner--bl {
  bottom: 12px;
  left: 12px;
  border-right: 0;
  border-top: 0;
  border-bottom-left-radius: 6px;
}
.vl-loader__corner--br {
  bottom: 12px;
  right: 12px;
  border-left: 0;
  border-top: 0;
  border-bottom-right-radius: 6px;
}

.vl-loader__scan {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 30%;
  z-index: 4;
  pointer-events: none;
  background: linear-gradient(
    to bottom,
    transparent,
    color-mix(in srgb, var(--accent-bright) 26%, transparent) 72%,
    color-mix(in srgb, var(--accent-bright) 70%, transparent)
  );
  border-bottom: 2px solid var(--accent-bright);
  box-shadow: 0 0 18px 3px
    color-mix(in srgb, var(--accent-bright) 45%, transparent);
  animation: vl-sweep 1.8s cubic-bezier(0.45, 0.05, 0.3, 1) infinite;
}
@keyframes vl-sweep {
  0% {
    opacity: 0;
    transform: translateY(-110%);
  }
  10% {
    opacity: 1;
  }
  82% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translateY(360%);
  }
}

.vl-loader__badge {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  z-index: 5;
  background: var(--qr-badge-bg);
  border: 2px solid var(--accent-bright);
  color: var(--accent-bright);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: 1rem;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  animation: vl-breathe 2.4s ease-in-out infinite;
}
@keyframes vl-breathe {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.07);
  }
}

.vl-loader__label {
  display: inline-flex;
  align-items: baseline;
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 600;
}
.vl-loader__dots {
  display: inline-flex;
  gap: 3px;
  margin-left: 5px;
  align-self: center;
}
.vl-loader__dots i {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-bright);
  animation: vl-dot 1.4s ease-in-out infinite;
}
.vl-loader__dots i:nth-child(2) {
  animation-delay: 0.2s;
}
.vl-loader__dots i:nth-child(3) {
  animation-delay: 0.4s;
}
@keyframes vl-dot {
  0%,
  100% {
    opacity: 0.25;
    transform: translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateY(-2px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .vl-loader__scan {
    animation: none;
    opacity: 0.55;
    top: 35%;
  }
  .vl-loader__matrix i.on,
  .vl-loader__badge,
  .vl-loader__dots i {
    animation: none;
  }
  .vl-loader__dots i {
    opacity: 0.7;
  }
}
.vl-error {
  text-align: center;
  padding: var(--space-16) var(--space-4);
  max-width: 460px;
  margin-inline: auto;
}
.vl-error svg {
  width: 48px;
  height: 48px;
  stroke: var(--text-subtle);
  margin: 0 auto var(--space-4);
  display: block;
}
.vl-error h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--text);
  margin-bottom: var(--space-2);
}
.vl-error p {
  color: var(--text-muted);
}

/* sticky toolbar */
.vl-toolbar {
  position: sticky;
  top: var(--header-h);
  z-index: 50;
  padding: var(--space-4) 0;
  margin-bottom: var(--space-4);
  margin-inline: calc(50% - 50vw);
  background: var(--surface-strong);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(150%);
  backdrop-filter: blur(var(--blur-strong)) saturate(150%);
  border-block: 1px solid var(--glass-hairline);
}
.vl-toolbar__inner {
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.vl-toolbar__row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}
.vl-search {
  position: relative;
  flex: 1 1 280px;
  min-width: 0;
}
.vl-search > svg:first-child {
  position: absolute;
  left: 13px;
  top: 50%;
  transform: translateY(-50%);
  width: 17px;
  height: 17px;
  stroke: var(--text-subtle);
  pointer-events: none;
}
.vl-search input {
  width: 100%;
  min-height: 44px;
  padding: 0 40px 0 38px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  background: var(--surface-opaque);
  color: var(--text);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-xs);
}
.vl-search input::placeholder {
  color: var(--text-subtle);
}
.vl-search input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
}
.vl-search__clear {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--text-muted);
}
.vl-search__clear[hidden] {
  display: none;
}
.vl-search__clear:hover {
  background: var(--surface-alt);
  color: var(--text);
}
.vl-search__clear svg {
  width: 15px;
  height: 15px;
  stroke: currentcolor;
}
.vl-controls {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}
.vl-seg {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 4px;
  gap: 2px;
  background: var(--surface-alt);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
}
.vl-seg button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 600;
  transition:
    background var(--dur) var(--ease-snap),
    color var(--dur) var(--ease-snap);
}
.vl-seg button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}
.vl-seg button svg {
  width: 16px;
  height: 16px;
  stroke: currentcolor;
}
.vl-seg button:hover {
  color: var(--text);
}
.vl-seg button[aria-current="true"] {
  background: var(--accent);
  color: var(--accent-contrast);
}
@media (max-width: 480px) {
  .vl-seg button span {
    display: none;
  }
  .vl-seg button {
    padding: 0 10px;
  }
}
.vl-sortwrap {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 14px;
  height: 44px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  background: var(--surface);
  color: var(--text-muted);
  transition: border-color var(--dur) var(--ease-snap);
}
.vl-sortwrap:focus-within {
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
}
.vl-sortwrap svg {
  width: 16px;
  height: 16px;
  stroke: currentcolor;
  flex-shrink: 0;
}
.vl-sortwrap select {
  border: 0;
  background: none;
  color: var(--text);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: inherit;
  padding-right: 2px;
  cursor: pointer;
}
.vl-sortwrap select:focus-visible {
  outline: none;
}
.vl-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: var(--space-3);
}
.vl-chip {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  padding: 0 14px;
  min-height: 38px;
  border-radius: var(--radius-pill);
  transition:
    background var(--dur) var(--ease-snap),
    color var(--dur) var(--ease-snap),
    border-color var(--dur) var(--ease-snap);
}
.vl-chip:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}
.vl-chip:hover {
  color: var(--text);
  border-color: var(--border-strong);
}
.vl-chip[aria-current="true"] {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: transparent;
}
.vl-count {
  font-size: var(--text-sm);
  color: var(--text-subtle);
  font-weight: 600;
  margin-bottom: var(--space-5);
}

/* list view */
.vl-list[hidden],
.vl-grid[hidden],
.vl-empty[hidden] {
  display: none !important;
}
.vl-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: 0;
}
.vl-row__link {
  display: grid;
  grid-template-columns: auto auto auto 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: 13px 18px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--card-shadow);
  transition:
    transform var(--dur) var(--ease-snap),
    box-shadow var(--dur) var(--ease-snap),
    border-color var(--dur) var(--ease-snap);
}
.vl-row__link:hover {
  transform: translateX(2px);
  box-shadow: var(--card-shadow-hover);
  border-color: color-mix(in srgb, var(--glass-border) 55%, var(--accent) 45%);
}
.vl-row__pill {
  flex-shrink: 0;
}
.vl-row__date {
  color: var(--text-subtle);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
}
.vl-row__tag {
  color: var(--text-muted);
  font-size: var(--text-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.vl-row__arrow {
  color: var(--text-subtle);
  transition:
    transform var(--dur) var(--ease-snap),
    color var(--dur) var(--ease-snap);
}
.vl-row__arrow svg {
  width: 18px;
  height: 18px;
  stroke: currentcolor;
}
.vl-row__link:hover .vl-row__arrow {
  color: var(--accent-on-light);
  transform: translateX(3px);
}
@media (max-width: 680px) {
  .vl-row__link {
    grid-template-columns: auto auto 1fr auto;
  }
  .vl-row__date {
    display: none;
  }
}
@media (max-width: 440px) {
  .vl-row__link {
    grid-template-columns: auto 1fr auto;
  }
  .vl-row__chip {
    display: none;
  }
}

.vl-empty {
  text-align: center;
  padding: var(--space-12) var(--space-4);
}
.vl-empty svg {
  width: 44px;
  height: 44px;
  stroke: var(--text-subtle);
  margin: 0 auto var(--space-4);
  display: block;
}
.vl-empty p {
  color: var(--text-muted);
  margin-bottom: var(--space-5);
}

.rn-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-bright));
  z-index: 200;
  transition: width 80ms linear;
}
@media (prefers-reduced-motion: reduce) {
  .rn-progress {
    transition: none;
  }
}

/* Sticky mini-header — tucks directly UNDER the main nav (not over it),
       so the primary navigation stays reachable and this reads as a secondary
       contextual bar. Sits below the header's z-index. */
.rn-mini {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  z-index: 80;
  transform: translateY(-100%);
  opacity: 0;
  transition:
    transform var(--dur) var(--ease-out),
    opacity var(--dur) var(--ease-out);
  background: var(--surface-strong);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  border-bottom: 1px solid var(--glass-hairline);
}
.rn-mini.is-shown {
  transform: translateY(0);
  opacity: 1;
}
.rn-mini__row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 52px;
}
.rn-mini__v {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-md);
  color: var(--text);
}
.rn-mini__label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-subtle);
}
.rn-mini__switch {
  margin-left: auto;
  display: flex;
  align-items: center;
}
@media (max-width: 520px) {
  .rn-mini__label {
    display: none;
  }
}

/* Hero masthead */
.rn-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(2.25rem, 1.6rem + 3vw, 3.75rem);
  border-bottom: 1px solid var(--glass-hairline);
}
.rn-hero__glow {
  position: absolute;
  top: -40%;
  right: -10%;
  width: 60%;
  height: 160%;
  background: radial-gradient(
    circle at 60% 40%,
    var(--accent-soft),
    transparent 62%
  );
  pointer-events: none;
  z-index: 0;
}
.rn-qr {
  position: absolute;
  top: 50%;
  right: clamp(-12px, 1vw, 24px);
  transform: translateY(-50%);
  width: 180px;
  height: 180px;
  opacity: 0.42;
  pointer-events: none;
  z-index: 0;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
  gap: 4px;
  -webkit-mask-image: radial-gradient(
    circle at 60% 50%,
    #000 30%,
    transparent 62%
  );
  mask-image: radial-gradient(circle at 60% 50%, #000 30%, transparent 62%);
}
.rn-qr i {
  border-radius: 2px;
  background: var(--qr-cell);
}
.rn-qr i.on {
  background: var(--qr-cell-on);
}
@media (max-width: 860px) {
  .rn-qr {
    display: none;
  }
}

.rn-hero__inner {
  position: relative;
  z-index: 1;
}
.rn-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: var(--text-sm);
  margin-bottom: var(--space-5);
  transition:
    color var(--dur) var(--ease-snap),
    gap var(--dur) var(--ease-snap);
}
.rn-back:hover {
  color: var(--accent-on-light);
  gap: 10px;
}
.rn-back svg {
  width: 16px;
  height: 16px;
  stroke: currentcolor;
}

.rn-hero__top {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}
.rn-vnum {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.4rem, 1.7rem + 3.4vw, 4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
}
.rn-vnum .v-prefix {
  color: var(--text-subtle);
}

.rn-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
}
.rn-badge__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentcolor;
  flex-shrink: 0;
}
.rn-badge--latest {
  background: var(--accent-soft);
  color: var(--accent-ink);
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
}
.rn-badge--latest .rn-badge__dot {
  box-shadow: 0 0 0 0 currentcolor;
  animation: rnPulse 2.4s ease-out infinite;
}
.rn-badge--stable {
  background: var(--success-soft);
  color: var(--success-ink);
}
.rn-badge--legacy {
  background: var(--surface-alt);
  color: var(--text-subtle);
  border-color: var(--glass-hairline);
}
@keyframes rnPulse {
  0% {
    box-shadow: 0 0 0 0 color-mix(in srgb, currentcolor 70%, transparent);
  }
  70% {
    box-shadow: 0 0 0 7px transparent;
  }
  100% {
    box-shadow: 0 0 0 0 transparent;
  }
}
@media (prefers-reduced-motion: reduce) {
  .rn-badge--latest .rn-badge__dot {
    animation: none;
  }
}

.rn-date {
  color: var(--text-subtle);
  font-size: var(--text-sm);
  font-weight: 600;
}
.rn-tagline {
  margin-top: var(--space-5);
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 1rem + 1.4vw, 1.85rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text);
  max-width: 22ch;
}
.rn-meta-row {
  margin-top: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-5);
  align-items: center;
}
.rn-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.rn-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  padding: 5px 11px;
  border-radius: var(--radius-pill);
}
.rn-chip svg {
  width: 13px;
  height: 13px;
  stroke: currentcolor;
  color: var(--accent-on-light);
}
.rn-readtime {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-subtle);
}
.rn-readtime svg {
  width: 14px;
  height: 14px;
  stroke: currentcolor;
}

/* Version switcher (segmented) */
.rn-switch {
  display: inline-flex;
  padding: 4px;
  gap: 2px;
  background: var(--surface-alt);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
}
.rn-switch button {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: 6px 13px;
  border-radius: var(--radius-pill);
  color: var(--text-muted);
  transition:
    background var(--dur) var(--ease-snap),
    color var(--dur) var(--ease-snap);
}
.rn-switch button:hover {
  color: var(--text);
}
.rn-switch button[aria-current="true"] {
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow:
    var(--shadow-sm),
    0 0 0 1px var(--accent);
  font-weight: 700;
}
.rn-switch button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}
/* Mini-header dropdown selector (clearer than a cramped button row) */
.rn-switch-select {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 36px;
}
.rn-switch-select select {
  appearance: none;
  -webkit-appearance: none;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--text-sm);
  height: 36px;
  padding: 0 30px 0 13px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.rn-switch-select select:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
}
.rn-switch-select svg {
  position: absolute;
  right: 10px;
  width: 15px;
  height: 15px;
  stroke: var(--text-muted);
  pointer-events: none;
}
.rn-mini__switch .rn-switch {
  padding: 3px;
}
.rn-mini__switch .rn-switch button {
  padding: 4px 10px;
  font-size: var(--text-xs);
}

.rn-edit {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--accent-on-light);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  background: var(--surface);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  transition:
    background var(--dur) var(--ease-snap),
    transform var(--dur) var(--ease-snap),
    box-shadow var(--dur) var(--ease-snap);
}
.rn-edit:hover {
  background: var(--accent-soft);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.rn-edit svg {
  width: 15px;
  height: 15px;
  stroke: currentcolor;
}
.rn-edit-hint {
  font-size: var(--text-xs);
  color: var(--text-subtle);
  margin-top: 7px;
}

/* Body layout: article + TOC rail */
.rn-body {
  padding-block: var(--space-10) var(--space-16);
}
.rn-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-10);
  align-items: start;
}
@media (min-width: 1000px) {
  .rn-grid {
    grid-template-columns: minmax(0, 1fr) 248px;
    gap: var(--space-12);
  }
}
.rn-article-wrap {
  min-width: 0;
}
.rn-article-head {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  justify-content: flex-end;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--glass-hairline);
}
.rn-article {
  min-width: 0;
  max-width: 780px;
}

/* TOC rail */
.rn-toc {
  position: sticky;
  top: calc(var(--header-h) + 68px);
  align-self: start;
}
.rn-toc__title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-subtle);
  margin-bottom: var(--space-3);
}
.rn-toc__list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border-left: 2px solid var(--glass-hairline);
}
.rn-toc__link {
  display: block;
  padding: 5px 0 5px 14px;
  margin-left: -2px;
  border-left: 2px solid transparent;
  color: var(--text-subtle);
  font-size: var(--text-sm);
  line-height: 1.35;
  transition:
    color var(--dur) var(--ease-snap),
    border-color var(--dur) var(--ease-snap);
}
.rn-toc__link:hover {
  color: var(--text);
}
.rn-toc__link.lvl-3 {
  padding-left: 26px;
  font-size: 0.82rem;
}
.rn-toc__link.lvl-4 {
  padding-left: 38px;
  font-size: 0.8rem;
  color: var(--text-subtle);
}
.rn-toc__link.is-active {
  color: var(--accent-on-light);
  border-left-color: var(--accent);
  font-weight: 600;
}

/* Mobile TOC drawer */
.rn-toc-mobile {
  display: none;
}
@media (max-width: 999px) {
  .rn-toc {
    display: none;
  }
  .rn-toc-mobile {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 60px);
    z-index: 60;
    margin-bottom: var(--space-6);
  }
  .rn-toc-mobile__btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: 11px 16px;
    border-radius: var(--radius-md);
    background: var(--surface-strong);
    -webkit-backdrop-filter: blur(var(--blur));
    backdrop-filter: blur(var(--blur));
    border: 1px solid var(--glass-border);
    color: var(--text);
    font-weight: 600;
    font-size: var(--text-sm);
  }
  .rn-toc-mobile__btn svg {
    width: 18px;
    height: 18px;
    stroke: currentcolor;
    transition: transform var(--dur) var(--ease-snap);
  }
  .rn-toc-mobile[data-open="true"] .rn-toc-mobile__btn svg {
    transform: rotate(180deg);
  }
  .rn-toc-mobile__panel {
    display: none;
    margin-top: 6px;
    padding: var(--space-3);
    background: var(--surface-strong);
    -webkit-backdrop-filter: blur(var(--blur));
    backdrop-filter: blur(var(--blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    max-height: 60vh;
    overflow-y: auto;
    box-shadow: var(--card-shadow);
  }
  .rn-toc-mobile[data-open="true"] .rn-toc-mobile__panel {
    display: block;
  }
}

/* ============================================================
       MARKDOWN ARTICLE STYLING (.rn-md)
       ============================================================ */
.rn-md {
  color: var(--text-muted);
  font-size: var(--text-md);
  line-height: 1.72;
}
.rn-md > *:first-child {
  margin-top: 0;
}
.rn-md h1,
.rn-md h2,
.rn-md h3,
.rn-md h4,
.rn-md h5,
.rn-md h6 {
  font-family: var(--font-display);
  color: var(--text);
  letter-spacing: -0.02em;
  scroll-margin-top: calc(var(--header-h) + 72px);
  position: relative;
}
.rn-md h2 {
  font-size: clamp(1.4rem, 1.2rem + 1vw, 1.8rem);
  font-weight: 700;
  margin-top: var(--space-12);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--glass-hairline);
}
.rn-md h3 {
  font-size: clamp(1.2rem, 1.05rem + 0.7vw, 1.45rem);
  font-weight: 700;
  margin-top: var(--space-10);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--glass-hairline);
}
.rn-md h2::before,
.rn-md h3::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 0.18em;
  bottom: 0.28em;
  width: 3px;
  border-radius: 2px;
  background: var(--accent);
  opacity: 0;
}
@media (min-width: 600px) {
  .rn-md h2::before,
  .rn-md h3::before {
    opacity: 0.85;
  }
}
.rn-md h4 {
  font-size: 1.08rem;
  font-weight: 600;
  margin-top: var(--space-8);
  color: var(--text);
}
.rn-md h5,
.rn-md h6 {
  font-size: 0.98rem;
  font-weight: 600;
  margin-top: var(--space-6);
  color: var(--text);
}

.rn-md p {
  margin-top: var(--space-4);
}
.rn-md strong {
  color: var(--text);
  font-weight: 700;
}
.rn-md a {
  color: var(--accent-on-light);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease-snap);
}
.rn-md a:hover {
  border-bottom-color: currentcolor;
}

.rn-md ul,
.rn-md ol {
  margin-top: var(--space-4);
  padding-left: 1.4em;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.rn-md li {
  padding-left: 4px;
}
.rn-md ul > li::marker {
  color: var(--accent);
}
.rn-md ol > li::marker {
  color: var(--accent-on-light);
  font-weight: 700;
}
.rn-md li > ul,
.rn-md li > ol {
  margin-top: 7px;
}

.rn-md hr {
  border: 0;
  height: 1px;
  background: var(--glass-hairline);
  margin: var(--space-8) 0;
}

/* Metadata grid (from grouped "**Label**: value" header paragraphs) */
.rn-meta {
  margin: var(--space-5) 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--card-shadow);
}
.rn-meta dt {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-subtle);
  padding: 11px 16px;
  background: var(--surface-alt);
  border-bottom: 1px solid var(--glass-hairline);
  border-right: 1px solid var(--glass-hairline);
  white-space: nowrap;
  display: flex;
  align-items: center;
}
.rn-meta dd {
  margin: 0;
  padding: 11px 16px;
  color: var(--text);
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--glass-hairline);
  min-width: 0;
  overflow-wrap: anywhere;
}
.rn-meta dt:nth-last-of-type(1),
.rn-meta dd:last-of-type {
  border-bottom: 0;
}
.rn-meta dd a {
  color: var(--accent-on-light);
}
.rn-meta dd code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--surface-alt);
  border: 1px solid var(--glass-hairline);
  padding: 1px 6px;
  border-radius: 6px;
}
@media (max-width: 560px) {
  .rn-meta {
    grid-template-columns: 1fr;
  }
  .rn-meta dt {
    border-right: 0;
    border-bottom: 0;
    padding-bottom: 2px;
    background: none;
  }
  .rn-meta dd {
    padding-top: 2px;
  }
  .rn-meta dd:not(:last-of-type) {
    border-bottom: 1px solid var(--glass-hairline);
    padding-bottom: 12px;
  }
}

/* anchor link button — sits after the heading text, reveals on hover */
.rn-anchor {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.05em;
  height: 1.05em;
  margin-left: 0.4em;
  vertical-align: middle;
  opacity: 0;
  color: var(--text-subtle);
  border-radius: 4px;
  transition:
    opacity var(--dur) var(--ease-snap),
    color var(--dur) var(--ease-snap);
}
.rn-md h2:hover .rn-anchor,
.rn-md h3:hover .rn-anchor,
.rn-md h4:hover .rn-anchor,
.rn-anchor:focus-visible {
  opacity: 1;
}
.rn-anchor:hover {
  color: var(--accent-on-light);
}
.rn-anchor svg {
  width: 0.8em;
  height: 0.8em;
  stroke: currentcolor;
}
@media (hover: none) {
  .rn-anchor {
    display: none;
  }
}

/* inline code */
.rn-md :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--surface-alt);
  color: var(--accent-ink);
  border: 1px solid var(--glass-hairline);
  padding: 1px 6px;
  border-radius: 6px;
  overflow-wrap: anywhere;
}
[data-theme="dark"] .rn-md :not(pre) > code {
  color: var(--accent-on-light);
}

/* code blocks */
.rn-code {
  margin-top: var(--space-5);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface-opaque);
  box-shadow: var(--card-shadow);
  max-width: 100%;
}
.rn-code__bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 8px 12px;
  background: var(--surface-alt);
  border-bottom: 1px solid var(--glass-hairline);
}
.rn-code__lang {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-subtle);
}
.rn-code__copy {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  padding: 4px 9px;
  border-radius: 6px;
  border: 1px solid var(--glass-border);
  background: var(--surface);
  transition:
    color var(--dur) var(--ease-snap),
    background var(--dur) var(--ease-snap);
}
.rn-code__copy:hover {
  color: var(--text);
  background: var(--surface-strong);
}
.rn-code__copy svg {
  width: 13px;
  height: 13px;
  stroke: currentcolor;
}
.rn-code__copy.is-done {
  color: var(--success-ink);
  border-color: color-mix(in srgb, var(--success) 40%, transparent);
}
.rn-code pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  max-width: 100%;
}
.rn-code pre code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text);
  background: none;
  padding: 0;
  white-space: pre;
  display: block;
  min-width: 0;
}
/* Theme-aware syntax highlighting (replaces the external light hljs theme,
       which was invisible in dark mode). All colours come from tokens. */
.rn-code .hljs {
  color: var(--text);
  background: none;
}
.rn-code .hljs-comment,
.rn-code .hljs-quote {
  color: var(--text-subtle);
  font-style: italic;
}
.rn-code .hljs-keyword,
.rn-code .hljs-selector-tag,
.rn-code .hljs-built_in,
.rn-code .hljs-name,
.rn-code .hljs-tag,
.rn-code .hljs-meta {
  color: var(--accent-on-light);
}
.rn-code .hljs-string,
.rn-code .hljs-title,
.rn-code .hljs-section,
.rn-code .hljs-attribute,
.rn-code .hljs-literal,
.rn-code .hljs-addition {
  color: var(--success-ink);
}
.rn-code .hljs-number,
.rn-code .hljs-symbol,
.rn-code .hljs-bullet,
.rn-code .hljs-link,
.rn-code .hljs-deletion {
  color: var(--warning-ink);
}
.rn-code .hljs-attr,
.rn-code .hljs-variable,
.rn-code .hljs-template-variable,
.rn-code .hljs-type,
.rn-code .hljs-selector-class,
.rn-code .hljs-selector-attr {
  color: var(--danger-ink);
}
.rn-code .hljs-emphasis {
  font-style: italic;
}
.rn-code .hljs-strong {
  font-weight: 700;
}

/* tables (HTML + GFM, styled identically) */
.rn-table-wrap {
  margin-top: var(--space-5);
  overflow-x: auto;
  max-width: 100%;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--card-shadow);
}
.rn-md table {
  border-collapse: collapse;
  width: 100%;
  font-size: var(--text-sm);
  background: var(--surface);
}
.rn-md thead {
  background: var(--surface-alt);
}
.rn-md th {
  text-align: left;
  font-weight: 700;
  color: var(--text);
  padding: 10px 14px;
  border-bottom: 2px solid var(--glass-hairline);
  white-space: nowrap;
}
.rn-md td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--glass-hairline);
  color: var(--text-muted);
  vertical-align: top;
}
.rn-md tbody tr:last-child td {
  border-bottom: 0;
}
.rn-md tbody tr:hover td {
  background: var(--surface-alt);
}
.rn-md td code,
.rn-md th code {
  white-space: nowrap;
}

/* callouts (blockquotes) */
.rn-callout {
  margin-top: var(--space-5);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  border-left: 3px solid var(--accent);
  background: var(--surface);
}
.rn-callout__icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  margin-top: 1px;
}
.rn-callout__icon svg {
  width: 22px;
  height: 22px;
  stroke: currentcolor;
}
.rn-callout__body {
  min-width: 0;
}
.rn-callout__label {
  font-weight: 700;
  color: var(--text);
  font-size: var(--text-sm);
  margin-bottom: 2px;
  display: block;
}
.rn-callout__body > *:first-child {
  margin-top: 0;
}
.rn-callout--note {
  border-left-color: var(--accent);
}
.rn-callout--note .rn-callout__icon,
.rn-callout--note .rn-callout__label {
  color: var(--accent-on-light);
}
.rn-callout--tip {
  border-left-color: var(--success);
}
.rn-callout--tip .rn-callout__icon,
.rn-callout--tip .rn-callout__label {
  color: var(--success-ink);
}
.rn-callout--important {
  border-left-color: var(--accent-bright);
}
.rn-callout--important .rn-callout__icon,
.rn-callout--important .rn-callout__label {
  color: var(--accent-on-light);
}
.rn-callout--warning {
  border-left-color: var(--warning);
}
.rn-callout--warning .rn-callout__icon,
.rn-callout--warning .rn-callout__label {
  color: var(--warning-ink);
}
.rn-callout--deprecated {
  border-left-color: var(--danger);
}
.rn-callout--deprecated .rn-callout__icon,
.rn-callout--deprecated .rn-callout__label {
  color: var(--danger-ink);
}

.rn-md details {
  margin-top: var(--space-5);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  background: var(--surface);
}
.rn-md summary {
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
}
.rn-md img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  margin-top: var(--space-5);
}
.rn-md figure {
  margin: var(--space-5) 0 0;
}
.rn-md figcaption {
  font-size: var(--text-xs);
  color: var(--text-subtle);
  text-align: center;
  margin-top: 6px;
}
.rn-md mark {
  background: var(--accent-soft);
  color: var(--accent-ink);
  padding: 0 3px;
  border-radius: 3px;
}
[data-theme="dark"] .rn-md mark {
  color: var(--accent-on-light);
}

/* pager */
.rn-pager {
  margin-top: var(--space-10);
  display: grid;
  gap: var(--space-3);
  grid-template-columns: 1fr 1fr;
}
.rn-pager__card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 12px 16px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--card-shadow);
  min-height: 60px;
  transition:
    transform var(--dur) var(--ease-snap),
    box-shadow var(--dur) var(--ease-snap),
    border-color var(--dur) var(--ease-snap);
}
.rn-pager__card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
  border-color: color-mix(in srgb, var(--glass-border) 60%, var(--accent) 40%);
}
.rn-pager__card svg {
  width: 18px;
  height: 18px;
  stroke: currentcolor;
  color: var(--text-subtle);
  flex-shrink: 0;
  transition:
    transform var(--dur) var(--ease-snap),
    color var(--dur) var(--ease-snap);
}
.rn-pager__card:hover svg {
  color: var(--accent-on-light);
}
.rn-pager__card:hover svg.pg-l {
  transform: translateX(-3px);
}
.rn-pager__card:hover svg.pg-r {
  transform: translateX(3px);
}
.rn-pager__txt {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}
.rn-pager__card--next {
  text-align: right;
  justify-content: flex-end;
}
.rn-pager__card--next .rn-pager__txt {
  align-items: flex-end;
}
.rn-pager__dir {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-subtle);
}
.rn-pager__v {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-md);
  color: var(--accent-on-light);
  line-height: 1.1;
}
.rn-pager__placeholder {
  opacity: 0.55;
  box-shadow: none;
  background: var(--surface-alt);
}
.rn-pager__placeholder:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--glass-border);
}
@media (max-width: 460px) {
  .rn-pager__dir {
    font-size: 0.6rem;
  }
  .rn-pager__v {
    font-size: var(--text-sm);
  }
}

.rn-editrow {
  margin-top: var(--space-10);
  padding: var(--space-6);
  border: 1px dashed var(--glass-border);
  border-radius: var(--radius-lg);
  text-align: center;
  background: var(--surface-alt);
}

/* skeleton */
.rn-skeleton {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.rn-sk {
  background: linear-gradient(
    100deg,
    var(--surface-alt) 30%,
    var(--surface-strong) 50%,
    var(--surface-alt) 70%
  );
  background-size: 200% 100%;
  border-radius: 8px;
  animation: rnShimmer 1.4s ease-in-out infinite;
}
.rn-sk--line {
  height: 16px;
}
.rn-sk--w90 {
  width: 90%;
}
.rn-sk--w70 {
  width: 70%;
}
.rn-sk--w50 {
  width: 50%;
}
.rn-sk--block {
  height: 120px;
}
@keyframes rnShimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .rn-sk {
    animation: none;
  }
}

/* error / not-found state */
.rn-state {
  text-align: center;
  padding: var(--space-16) var(--space-4);
  max-width: 480px;
  margin-inline: auto;
}
.rn-state__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-5);
  color: var(--text-subtle);
}
.rn-state__icon svg {
  width: 56px;
  height: 56px;
  stroke: currentcolor;
}
.rn-state h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--text);
  margin-bottom: var(--space-3);
}
.rn-state p {
  color: var(--text-muted);
  margin-bottom: var(--space-6);
}

/* copied toast */
.rn-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--tt-bg);
  color: var(--tt-fg);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out);
  z-index: 300;
}
.rn-toast.is-shown {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* entrance */
@media (prefers-reduced-motion: no-preference) {
  .rn-rise {
    opacity: 0;
    transform: translateY(16px);
    animation: rnRise 0.6s var(--ease-out) forwards;
  }
  @keyframes rnRise {
    to {
      opacity: 1;
      transform: none;
    }
  }
}