/* ==========================================================================
   易游会馆 · 香港站 | 共享样式 /assets/site.css
   玻璃层叠：背景色层 → 图片层 → 半透明内容层
   ========================================================================== */

:root {
  --color-surface: #f9f9f9;
  --color-surface-alt: #f0f0f1;
  --color-surface-deep: #e3e4e5;
  --color-ink: #434751;
  --color-ink-soft: #676d79;
  --color-ink-muted: #767c89;
  --color-line: #d8d9db;
  --color-primary: #3063cf;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dde4f3;
  --color-accent: #207da7;
  --color-accent-ink: #ffffff;
  --color-highlight: #d2e3ea;
  --color-focus: #1477a4;
  --color-contrast-surface: #161b27;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #434751;
  --color-contrast-accent: #28a0d7;
  --overlay-scrim: linear-gradient(180deg, rgba(22, 27, 39, 0.35) 0%, rgba(22, 27, 39, 0.72) 55%, rgba(22, 27, 39, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 11.4px;
  --text-sm: 14.3px;
  --text-base: 16px;
  --text-lg: 20.0px;
  --text-xl: 25.0px;
  --text-2xl: 31.2px;
  --text-3xl: 39.1px;
  --text-4xl: 48.8px;
  --text-display: clamp(37px, 7.6vw, 97px);
  --text-figure: clamp(31px, 5.5vw, 70px);
  --weight-heading: 674;
  --weight-body: 400;
  --leading-body: 1.77;
  --leading-heading: 1.22;
  --tracking-heading: 0.002em;
  --radius-sm: 14px;
  --radius-md: 16px;
  --radius-lg: 18px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(67, 71, 81, 0.08);
  --shadow-2: 0 18px 44px rgba(67, 71, 81, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1240px;
  --measure: 72ch;
  --gutter: 24px;
  --section-y: 88px;
  --section-y-lg: 123px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 108px; }
body, h1, h2, h3, h4, p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

body {
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 4px;
}
.section--night :focus-visible,
.site-footer :focus-visible { outline-color: var(--color-contrast-accent); }

/* ---------- typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p { max-width: var(--measure); }

.display-1 {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.98;
  letter-spacing: -0.012em;
  color: var(--color-ink);
  max-width: 20ch;
}
.figure-lg {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.lede {
  font-size: var(--text-lg);
  line-height: 1.58;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.num, .mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.small { font-size: var(--text-sm); }
.muted { color: var(--color-ink-muted); }
.text-accent { color: var(--color-accent); }
.text-primary { color: var(--color-primary); }

.section--night h1, .section--night h2, .section--night h3, .section--night h4,
.section--band h1, .section--band h2, .section--band h3, .section--band h4 { color: var(--color-contrast-ink); }
.section--night p, .section--night li, .section--night dd { color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent); }
.section--band p, .section--band li { color: color-mix(in srgb, var(--color-primary-ink) 84%, transparent); }
.section--night .eyebrow, .section--night .muted { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }

.link {
  color: var(--color-accent);
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 42%, transparent);
  transition: color .18s ease, border-color .18s ease;
}
.link:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }

/* ---------- layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container-wide { max-width: calc(var(--container) + 96px); }
.measure { max-width: var(--measure); }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
  align-items: start;
}
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

/* ---------- sections & bands ---------- */
.section { padding-block: var(--section-y); position: relative; }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background-color: var(--color-surface-alt); }
.section--deep { background-color: var(--color-surface-deep); }
.section--night { background-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.section--band { background-color: var(--color-primary); color: var(--color-primary-ink); }

/* ---------- glass panels ---------- */
.glass-panel {
  position: relative;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-line) 94%, transparent);
  background: color-mix(in srgb, var(--color-surface) 76%, transparent);
  box-shadow: var(--shadow-1);
  backdrop-filter: blur(16px) saturate(132%);
  -webkit-backdrop-filter: blur(16px) saturate(132%);
  transition: transform .24s ease, border-color .24s ease, box-shadow .24s ease;
}
.glass-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(148deg, color-mix(in srgb, var(--color-primary-ink) 52%, transparent), transparent 46%);
  pointer-events: none;
}
.glass-panel > * { position: relative; z-index: 1; }
.glass-panel--interactive:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--color-focus) 44%, transparent);
  box-shadow: var(--shadow-2);
}
.glass-panel--on-color {
  background: color-mix(in srgb, var(--color-primary-ink) 82%, transparent);
  border-color: color-mix(in srgb, var(--color-primary-ink) 68%, transparent);
}
.glass-panel--on-color::before { background: linear-gradient(148deg, color-mix(in srgb, var(--color-primary-ink) 62%, transparent), transparent 50%); }
.glass-panel--dark {
  background: color-mix(in srgb, var(--color-contrast-surface) 62%, transparent);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
  box-shadow: none;
}
.glass-panel--dark::before { background: linear-gradient(148deg, color-mix(in srgb, var(--color-contrast-accent) 16%, transparent), transparent 52%); }
.glass-panel--flat { box-shadow: none; }

/* ---------- chapter skeleton ---------- */
.chapter { position: relative; }
.chapter-number {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: color-mix(in srgb, var(--color-primary) 78%, transparent);
}
.chapter-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-1);
}
.chapter-title { font-size: var(--text-2xl); margin-top: var(--space-2); }
.rule-line { height: 1px; border: 0; background: var(--color-line); margin-block: var(--space-4); }
.section--night .rule-line { background: var(--color-contrast-line); }
.scale-line { position: relative; height: 1px; background: var(--color-line); margin-block: var(--space-3); }
.scale-line::after {
  content: "";
  position: absolute;
  right: 0;
  top: -3px;
  width: 8px;
  height: 7px;
  border-radius: 2px;
  background: var(--color-accent);
}
.section--night .scale-line { background: var(--color-contrast-line); }
.section--night .scale-line::after { background: var(--color-contrast-accent); }

.emphasis { position: relative; padding-left: var(--space-3); }
.emphasis::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.28em;
  bottom: 0.28em;
  width: 3px;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--color-accent), color-mix(in srgb, var(--color-accent) 22%, transparent));
}
.color-bar {
  display: inline-block;
  width: 34px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}
.note {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-accent);
  background: color-mix(in srgb, var(--color-highlight) 68%, transparent);
  font-size: var(--text-sm);
  color: var(--color-ink);
}
.divider { height: 1px; border: 0; background: var(--color-line); margin-block: var(--space-6); }

/* ---------- controls ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 11px 20px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid transparent;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background: color-mix(in srgb, var(--color-primary) 86%, var(--color-contrast-surface)); }
.btn--ghost { border-color: var(--color-line); color: var(--color-ink); }
.btn--ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn--quiet { background: var(--color-primary-soft); color: var(--color-primary); }
.btn--quiet:hover { background: color-mix(in srgb, var(--color-primary-soft) 78%, var(--color-primary)); }

.tag, .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-line) 96%, transparent);
  color: var(--color-ink-soft);
  background: color-mix(in srgb, var(--color-surface) 70%, transparent);
}
.badge--accent { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.badge--quiet { background: var(--color-primary-soft); border-color: transparent; color: var(--color-primary); }

.filter-bar { display: flex; flex-wrap: wrap; gap: var(--space-1); align-items: center; }
.filter-btn {
  padding: 7px 15px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface) 72%, transparent);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}
.filter-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.filter-btn[aria-pressed="true"], .filter-btn.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.filter-btn:disabled, .filter-btn.is-empty { opacity: .42; cursor: not-allowed; }
.is-filtered-out { display: none !important; }

/* ---------- breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.breadcrumb a { color: var(--color-ink-soft); transition: color .18s ease; }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb .sep { font-family: var(--font-mono); color: var(--color-line); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); font-weight: 600; }

/* ---------- index list ---------- */
.index-list { display: grid; gap: 0; }
.index-list a {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}
.index-list a::before {
  content: attr(data-idx);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.index-list a:hover { background: color-mix(in srgb, var(--color-primary-soft) 55%, transparent); color: var(--color-primary); }
.index-list a.is-active, .index-list a[aria-current="true"] {
  background: color-mix(in srgb, var(--color-primary-soft) 78%, transparent);
  border-left-color: var(--color-accent);
  color: var(--color-primary);
}

/* ---------- media ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
  isolation: isolate;
}
.media > img { width: 100%; height: 100%; object-fit: cover; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--3x2 { aspect-ratio: 3 / 2; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.media-copy {
  position: absolute;
  z-index: 2;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  color: var(--color-primary-ink);
}
.media-caption {
  position: absolute;
  z-index: 3;
  left: var(--space-2);
  bottom: var(--space-2);
  max-width: calc(100% - var(--space-4));
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-highlight) 94%, transparent);
  color: var(--color-ink);
  font-size: var(--text-xs);
  line-height: 1.5;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.media-caption--top { bottom: auto; top: var(--space-2); }
.layer-drift { animation: layerDrift 36s ease-in-out infinite alternate; will-change: transform; }
@keyframes layerDrift {
  from { transform: translate3d(0, 0, 0) scale(1.02); }
  to { transform: translate3d(-2%, -1.5%, 0) scale(1.07); }
}

/* ---------- reveal ---------- */
html.js [data-reveal] { opacity: 0; transform: translateY(14px); }
html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity .55s ease, transform .55s ease;
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  transform: translateY(-160%);
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); }

/* ==========================================================================
   header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-surface) 80%, transparent);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: background-color .24s ease;
}
.site-header[data-state="compact"] { background: color-mix(in srgb, var(--color-surface) 93%, transparent); }

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3) var(--gutter);
  transition: padding-block .24s ease;
}
.site-header[data-state="compact"] .header-inner { padding-block: var(--space-2); }

.brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: linear-gradient(140deg, var(--color-primary), var(--color-accent));
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: var(--shadow-1);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.14; }
.brand-name { font-family: var(--font-heading); font-size: var(--text-lg); font-weight: var(--weight-heading); color: var(--color-ink); }
.brand-desc { font-size: var(--text-xs); letter-spacing: 0.06em; color: var(--color-ink-muted); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 8px 13px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface) 72%, transparent);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 600;
}
.nav-toggle-bars { position: relative; width: 16px; height: 12px; }
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: var(--radius-pill);
  background: currentColor;
  transition: transform .22s ease, top .22s ease;
}
.nav-toggle-bars::before { top: 1px; }
.nav-toggle-bars::after { top: 9px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 5px; transform: rotate(-45deg); }
.nav-toggle[aria-expanded="true"] { border-color: color-mix(in srgb, var(--color-focus) 55%, transparent); background: var(--color-primary-soft); color: var(--color-primary); }

.site-nav { display: flex; align-items: center; gap: var(--space-2); margin-left: auto; }
.nav-list { display: flex; align-items: center; gap: 2px; counter-reset: navidx; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 12px 10px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid transparent;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink-soft);
  transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}
.nav-link::before {
  counter-increment: navidx;
  content: counter(navidx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  transition: color .18s ease;
}
.nav-link:hover { color: var(--color-primary); background-color: color-mix(in srgb, var(--color-primary-soft) 55%, transparent); }
.nav-link:hover::before { color: var(--color-accent); }
.nav-link[aria-current="page"] {
  color: var(--color-primary);
  background-color: color-mix(in srgb, var(--color-primary-soft) 78%, transparent);
  border-color: color-mix(in srgb, var(--color-focus) 46%, transparent);
}
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.header-version {
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 9px 17px;
  border-radius: var(--radius-pill);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
  transition: background-color .2s ease, color .2s ease;
}
.nav-cta:hover { background: var(--color-primary); color: var(--color-primary-ink); }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-contrast-accent));
  pointer-events: none;
}

/* ==========================================================================
   footer
   ========================================================================== */
.site-footer {
  position: relative;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(62% 46% at 10% 0%, color-mix(in srgb, var(--color-contrast-accent) 20%, transparent), transparent 70%),
    radial-gradient(46% 42% at 94% 6%, color-mix(in srgb, var(--color-primary) 34%, transparent), transparent 72%);
}
.footer-inner {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-6) var(--gutter);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-8) var(--gutter) var(--space-6);
}
.footer-brand { grid-column: 1 / span 5; }
.footer-brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}
.footer-brand-short {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-contrast-accent);
}
.footer-brand-line {
  margin-top: var(--space-3);
  max-width: 40ch;
  font-size: var(--text-sm);
  line-height: 1.65;
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}
.footer-contact { margin-top: var(--space-4); display: grid; gap: 10px; max-width: 46ch; }
.footer-contact-item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: var(--space-2);
  align-items: baseline;
  padding-bottom: 9px;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-contrast-line) 62%, transparent);
}
.footer-contact-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 52%, transparent);
}
.footer-contact-value {
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.footer-index {
  grid-column: 6 / span 7;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--gutter);
}
.footer-col-title {
  margin-bottom: var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
}
.footer-list { display: grid; gap: 10px; }
.footer-link {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
  border-bottom: var(--border-thin) solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.footer-link:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: color-mix(in srgb, var(--color-contrast-accent) 62%, transparent);
}

.footer-legal {
  position: relative;
  padding: var(--space-3) 0 var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}
.footer-legal-inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  gap: 9px;
}
.footer-legal-text { font-size: var(--text-xs); line-height: 1.7; color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); max-width: none; }
.footer-region { font-size: var(--text-xs); line-height: 1.7; color: color-mix(in srgb, var(--color-contrast-ink) 50%, transparent); max-width: 96ch; }
.footer-meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 46%, transparent);
}

/* ==========================================================================
   responsive
   ========================================================================== */
@media (max-width: 1159px) {
  .header-version { display: none; }
  .nav-link { padding-inline: 9px; }
}

@media (max-width: 1023px) {
  .col-3, .col-4 { grid-column: span 6; }
  .col-5, .col-6, .col-7, .col-8, .col-9 { grid-column: span 12; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-index { grid-column: 1 / -1; }
}

@media (max-width: 959px) {
  html { scroll-padding-top: 88px; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    margin-left: 0;
    padding: var(--space-3) var(--gutter) var(--space-4);
    max-height: calc(100vh - 92px);
    overflow-y: auto;
    background: color-mix(in srgb, var(--color-surface) 94%, transparent);
    backdrop-filter: blur(22px) saturate(150%);
    -webkit-backdrop-filter: blur(22px) saturate(150%);
    border-bottom: var(--border-thin) solid var(--color-line);
    box-shadow: var(--shadow-2);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
  }
  .site-header[data-open="true"] .site-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-link {
    justify-content: flex-start;
    padding: 12px 6px;
    border-radius: 0;
    border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-line) 68%, transparent);
  }
  .nav-link[aria-current="page"] {
    border-radius: var(--radius-sm);
    padding-left: 12px;
    border-color: color-mix(in srgb, var(--color-focus) 40%, transparent);
  }
  .nav-link[aria-current="page"]::after { left: 12px; right: auto; width: 18px; bottom: 5px; }
  .header-version { display: block; border-left: 0; padding-left: 0; padding-block: var(--space-1); }
  .nav-cta { justify-content: center; width: 100%; margin-top: var(--space-1); }
  .footer-index { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 639px) {
  :root { --section-y: 64px; --section-y-lg: 80px; }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-12 { grid-column: span 12; }
  .glass-panel { padding: var(--space-3); }
  .footer-contact-item { grid-template-columns: 1fr; gap: 4px; }
}

@media (max-width: 479px) {
  .brand-desc { display: none; }
  .footer-index { grid-template-columns: 1fr; }
}

/* ==========================================================================
   motion preferences
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .layer-drift { animation: none !important; transform: none !important; }
  html.js [data-reveal] { opacity: 1 !important; transform: none !important; }
}