/* =========================================================
   必发体验站 · 坐标新生
   全站共享样式 —— /assets/site.css
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, hr { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
hr { border: 0; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink-900: #061020;
  --ink-800: #0C1B2E;
  --ink-700: #17293F;
  --mist: #A7B9CC;
  --white: #F2F7FC;
  --cyan: #2FE3D4;
  --gold: #F5B84B;
  --rose: #F0527A;
  --paper: #F4EEE2;
  --on-gold: #241703;
  --on-cyan: #04202A;

  --font-display: "Archivo Narrow", "Oswald", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-h1: clamp(2.6rem, 6vw, 4.6rem);
  --fs-h2: clamp(1.6rem, 3vw, 2.4rem);
  --fs-h3: clamp(1.125rem, 1.4vw, 1.375rem);
  --fs-body: clamp(0.95rem, 1.1vw, 1.0625rem);
  --fs-caption: 0.8125rem;

  --wrap: 1280px;
  --gutter: 24px;
  --sp-section: clamp(64px, 8vw, 96px);
  --radius-panel: 14px;
  --radius-pill: 999px;

  --glass: rgba(12, 27, 46, 0.62);
  --glass-strong: rgba(6, 16, 32, 0.92);
  --glass-line: rgba(167, 185, 204, 0.22);

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. Base ---------- */
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.78;
  color: var(--white);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, rgba(23, 41, 63, 0.45) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23, 41, 63, 0.45) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: -1px -1px;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main { display: block; }

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: 0.05em;
  color: var(--white);
}

p { overflow-wrap: break-word; }

strong, b { font-weight: 600; color: var(--white); }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}
#main-content:focus { outline: none; }

::selection { background: var(--cyan); color: var(--on-cyan); }

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: absolute;
  top: -120px;
  left: 16px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--gold);
  color: var(--on-gold);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 14px; }

/* ---------- 5. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  padding: clamp(10px, 1.4vw, 16px) 0 0;
}

.header-rail {
  position: relative;
  display: flex;
  align-items: stretch;
  gap: 10px;
  width: 100%;
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: clamp(12px, 3vw, 28px);
}

.nav-island {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-pill);
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px) saturate(1.25);
  backdrop-filter: blur(14px) saturate(1.25);
  transition: background-color 0.24s var(--ease), border-color 0.24s var(--ease);
}

/* 品牌岛 */
.nav-island--brand {
  flex: 0 0 auto;
  padding: 6px 16px 6px 8px;
  gap: 12px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(150deg, var(--cyan) 0%, #17907f 100%);
  color: var(--on-cyan);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand__name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--white);
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.version-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  padding-left: 12px;
  border-left: 1px solid var(--glass-line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  color: var(--gold);
  transition: color 0.18s var(--ease);
}
.version-chip:hover { color: var(--white); }
.version-chip__label { color: var(--mist); font-size: 0.6875rem; }
.version-chip__value { font-weight: 600; }

/* 栏目岛 */
.nav-island--menu {
  flex: 1 1 auto;
  min-width: 0;
  justify-content: center;
  padding: 5px;
}

.nav-menu {
  display: flex;
  flex: 1 1 auto;
  justify-content: center;
  min-width: 0;
}
.nav-list { display: flex; align-items: center; gap: 2px; flex-wrap: nowrap; }
.nav-link {
  display: block;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  color: var(--mist);
  white-space: nowrap;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}
.nav-link:hover { color: var(--white); background: rgba(47, 227, 212, 0.1); }
.nav-link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(47, 227, 212, 0.13);
  box-shadow: inset 0 0 0 1px rgba(47, 227, 212, 0.36);
  font-weight: 600;
}
.nav-menu__meta {
  display: none;
  padding: 12px 14px 4px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-line);
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  color: var(--white);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}
.nav-toggle__bars { display: grid; gap: 4px; width: 16px; }
.nav-toggle__bar {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform 0.18s var(--ease), opacity 0.18s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child { transform: translateY(-3px) rotate(-45deg); }

/* 行动岛 */
.nav-island--quick { flex: 0 0 auto; padding: 5px; }
.quick-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  background: var(--gold);
  color: var(--on-gold);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  transition: background-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.quick-link:hover { background: #FFC961; transform: translateY(-1px); }
.quick-link__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--on-gold);
  animation: coord-pulse 2.6s var(--ease) infinite;
}

/* 坐标刻度带 */
.header-scale {
  display: flex;
  align-items: center;
  gap: 3px;
  height: 3px;
  max-width: 1440px;
  margin: 10px auto 0;
  padding-inline: clamp(12px, 3vw, 28px);
  opacity: 0.55;
  transition: opacity 0.3s var(--ease);
}
.header-scale__seg {
  flex: 1 1 0;
  height: 3px;
  border-radius: 2px;
  background: var(--ink-700);
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.header-scale__seg.is-lit {
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(47, 227, 212, 0.55);
}

/* 收缩态 */
.site-header.is-condensed { padding-top: 8px; }
.site-header.is-condensed .nav-island { background: var(--glass-strong); }
.site-header.is-condensed .brand__sub { display: none; }
.site-header.is-condensed .header-scale { opacity: 1; }

@keyframes coord-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.78); }
}

/* ---------- 6. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: var(--sp-section);
  border-top: 1px solid var(--ink-700);
  background:
    linear-gradient(180deg, rgba(12, 27, 46, 0) 0%, rgba(12, 27, 46, 0.88) 26%, var(--ink-800) 100%);
  overflow: hidden;
}

.contour {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.6;
  background-image:
    repeating-radial-gradient(circle at 8% 132%, transparent 0 48px, rgba(47, 227, 212, 0.085) 48px 49px),
    repeating-radial-gradient(circle at 94% -18%, transparent 0 62px, rgba(167, 185, 204, 0.07) 62px 63px);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 42%, #000 100%);
  mask-image: linear-gradient(180deg, transparent 0%, #000 42%, #000 100%);
}

.footer-inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(48px, 6vw, 80px) 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(28px, 4vw, 44px);
  border-bottom: 1px solid var(--ink-700);
}

.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(150deg, var(--cyan) 0%, #17907f 100%);
  color: var(--on-cyan);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
}
.footer-brand__name {
  margin-top: 16px;
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--white);
}
.footer-brand__line {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.footer-version-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 32px);
}
.footer-col__title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-col__list { display: grid; gap: 10px; }
.footer-link {
  font-size: 0.875rem;
  color: var(--mist);
  transition: color 0.18s var(--ease), padding-left 0.18s var(--ease);
}
.footer-link:hover { color: var(--white); padding-left: 4px; }
.footer-meta {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  color: var(--mist);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px 24px;
  padding-block: clamp(26px, 3.5vw, 36px);
  border-bottom: 1px solid var(--ink-700);
}
.footer-contact__row { display: grid; gap: 6px; }
.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--mist);
  opacity: 0.75;
}
.footer-contact__val { font-size: 0.875rem; color: var(--white); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  padding-top: 26px;
  font-size: 0.8125rem;
  color: var(--mist);
}
.footer-legal__icp { font-family: var(--font-mono); letter-spacing: 0.04em; }
.footer-legal__copy { font-family: var(--font-mono); letter-spacing: 0.04em; }
.footer-legal__note { opacity: 0.72; }

/* ---------- 7. Layout helpers ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}
.split--reverse { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.split__aside { min-width: 0; }
.split__main { min-width: 0; }

.stack { display: grid; gap: 16px; }
.stack--sm { gap: 8px; }
.stack--lg { gap: 28px; }

/* ---------- 8. Type helpers ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  display: block;
  width: 22px;
  height: 1px;
  background: currentColor;
}

.display-1 { font-size: var(--fs-h1); letter-spacing: 0.03em; line-height: 1.06; }
.display-2 { font-size: var(--fs-h2); letter-spacing: 0.05em; }
.display-3 { font-size: var(--fs-h3); letter-spacing: 0.04em; }

.lede {
  max-width: 62ch;
  font-size: clamp(1rem, 1.5vw, 1.1875rem);
  line-height: 1.72;
  color: var(--mist);
}

.muted { color: var(--mist); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }
.accent-cyan { color: var(--cyan); }
.accent-gold { color: var(--gold); }
.accent-rose { color: var(--rose); }

.tick {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 3vw, 36px);
  background-image: repeating-linear-gradient(to right, var(--ink-700) 0 14px, transparent 14px 26px);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 9. Sections & panels ---------- */
.section { padding-block: var(--sp-section); }
.section--tight { padding-block: clamp(40px, 5vw, 64px); }
.section--paper {
  background: var(--paper);
  color: #1B2534;
  border-radius: clamp(16px, 2vw, 28px);
}
.section--paper h1,
.section--paper h2,
.section--paper h3,
.section--paper h4 { color: #0B1626; }
.section--paper .lede { color: rgba(11, 22, 38, 0.74); }
.section--paper .muted { color: rgba(11, 22, 38, 0.66); }
.section--paper .panel { background: #FFFFFF; border-color: rgba(11, 22, 38, 0.12); }
.section--paper .spec-list { border-color: rgba(11, 22, 38, 0.16); }
.section--paper .spec-list__row { border-color: rgba(11, 22, 38, 0.16); }
.section--paper .spec-list__key { color: rgba(11, 22, 38, 0.66); }
.section--paper .spec-list__val { color: #0B1626; }
.section--paper .chip { background: rgba(11, 22, 38, 0.06); border-color: rgba(11, 22, 38, 0.16); color: rgba(11, 22, 38, 0.72); }
.section--paper .btn--ghost { border-color: rgba(11, 22, 38, 0.24); color: #0B1626; }
.section--paper .btn--ghost:hover { border-color: #0B1626; color: #0B1626; }

.panel {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-panel);
  background: var(--ink-800);
}
.panel--glass {
  background: var(--glass);
  border-color: var(--glass-line);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
}

/* ---------- 10. Atoms ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
              border-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn--gold { background: var(--gold); color: var(--on-gold); }
.btn--gold:hover { background: #FFC961; }
.btn--cyan { background: var(--cyan); color: var(--on-cyan); }
.btn--cyan:hover { background: #55F0E3; }
.btn--ghost { border-color: var(--glass-line); color: var(--white); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.tag--cyan { color: var(--cyan); border-color: rgba(47, 227, 212, 0.42); }
.tag--gold { color: var(--gold); border-color: rgba(245, 184, 75, 0.42); }
.tag--rose { color: var(--rose); border-color: rgba(240, 82, 122, 0.46); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-pill);
  background: rgba(23, 41, 63, 0.72);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--mist);
}

.node {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 227, 212, 0.16);
}

.stat { display: grid; gap: 6px; }
.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 2.125rem);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--gold);
}
.stat__label { font-size: var(--fs-caption); letter-spacing: 0.04em; color: var(--mist); }

.spec-list { display: grid; border-top: 1px solid var(--ink-700); }
.spec-list__row {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--ink-700);
}
.spec-list__key { font-size: 0.875rem; color: var(--mist); }
.spec-list__val {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.copy-btn:hover { color: var(--cyan); border-color: rgba(47, 227, 212, 0.5); }
.copy-btn[data-copied] { color: var(--gold); border-color: rgba(245, 184, 75, 0.5); }

/* ---------- 11. Media frames ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-panel);
  background-color: var(--ink-800);
  aspect-ratio: 16 / 9;
}
.media-frame img,
.media-frame svg { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--grid {
  background-image:
    linear-gradient(to right, rgba(47, 227, 212, 0.14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(47, 227, 212, 0.14) 1px, transparent 1px);
  background-size: 40px 40px;
}
.media-frame__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* ---------- 12. Breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.breadcrumbs a { color: var(--mist); transition: color 0.18s var(--ease); }
.breadcrumbs a:hover { color: var(--white); }
.breadcrumbs__sep { color: var(--ink-700); }
.breadcrumbs [aria-current="page"] { color: var(--cyan); }

/* ---------- 13. Tabs ---------- */
.tabs { display: grid; gap: 22px; }
.tabs__list {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-pill);
  background: rgba(12, 27, 46, 0.82);
  justify-self: start;
}
.tabs__tab {
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-size: 0.875rem;
  color: var(--mist);
  white-space: nowrap;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.tabs__tab:hover { color: var(--white); }
.tabs__tab[aria-selected="true"] {
  background: rgba(47, 227, 212, 0.14);
  color: var(--cyan);
  font-weight: 600;
}
.tabs__panel { display: none; }
.tabs__panel[data-active] { display: block; animation: panel-in 0.18s var(--ease) both; }

@keyframes panel-in {
  from { opacity: 0; transform: translateX(8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 14. Disclosure ---------- */
.disclosure { display: grid; border-top: 1px solid var(--ink-700); }
.disclosure__item { border-bottom: 1px solid var(--ink-700); }
.disclosure__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 4px;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
}
.disclosure__trigger::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--cyan);
}
.disclosure__item[data-open] .disclosure__trigger::after { content: "\2212"; }
.disclosure__panel { display: none; padding: 0 4px 22px; font-size: 0.9375rem; color: var(--mist); }
.disclosure__item[data-open] .disclosure__panel { display: block; }

/* ---------- 15. Timeline ---------- */
.timeline {
  display: grid;
  padding-left: 24px;
  border-left: 1px solid var(--ink-700);
}
.timeline__item { position: relative; padding-bottom: 30px; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
}
.timeline__time {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* ---------- 16. Reveal ---------- */
[data-motion="on"] .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
[data-motion="on"] .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 17. Responsive ---------- */
@media (max-width: 1199px) {
  .nav-link { padding: 9px 11px; font-size: 0.8438rem; }
}

@media (max-width: 1023px) {
  .version-chip { display: none; }

  .nav-island--menu {
    flex: 1 1 auto;
    justify-content: flex-end;
    padding: 0;
    background: none;
    border: 0;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
  .nav-island--menu .nav-toggle { display: inline-flex; }

  .nav-menu {
    position: absolute;
    top: calc(100% + 10px);
    left: clamp(12px, 3vw, 28px);
    right: clamp(12px, 3vw, 28px);
    display: block;
    padding: 10px;
    border: 1px solid var(--glass-line);
    border-radius: 20px;
    background: var(--glass-strong);
    -webkit-backdrop-filter: blur(18px) saturate(1.3);
    backdrop-filter: blur(18px) saturate(1.3);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.45);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s var(--ease);
    z-index: 70;
  }
  .nav-menu[data-open] { opacity: 1; visibility: visible; transform: translateY(0); }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav-link { padding: 13px 14px; border-radius: 12px; font-size: 0.9375rem; }
  .nav-menu__meta { display: block; }

  .span-3, .span-4, .span-5 { grid-column: span 6; }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 767px) {
  .brand__name { font-size: 0.9375rem; letter-spacing: 0.1em; }
  .brand__sub { display: none; }
  .nav-island--brand { padding: 6px 12px 6px 8px; }
  .quick-link { padding: 9px 14px; font-size: 0.75rem; }
  .nav-toggle { padding: 9px 13px; }
  .nav-toggle__label { display: none; }

  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-12 { grid-column: span 6; }

  .split, .split--reverse { grid-template-columns: minmax(0, 1fr); }

  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .footer-legal { flex-direction: column; align-items: flex-start; gap: 8px; }
  .spec-list__row { grid-template-columns: minmax(0, 1fr); gap: 4px; }
}

@media (max-width: 480px) {
  .quick-link__text { font-size: 0.6875rem; }
  .tabs__list { width: 100%; justify-content: space-between; }
  .tabs__tab { padding: 8px 12px; font-size: 0.8125rem; flex: 1 1 auto; text-align: center; }
}

/* ---------- 18. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-motion="on"] .reveal { opacity: 1; transform: none; }
  .tabs__panel[data-active] { animation: none; }
}