/* ============================================================
   欧博CN官方品牌站 — 共享样式 /assets/site.css
   夜间数据控制台 × 档案馆
   ============================================================ */

/* ---------- 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, dt { margin: 0; }
ul, ol { padding: 0; 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; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; border-top: 1px solid var(--line); }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-abyss: #07131F;
  --ink-slate: #0E1F30;
  --ink-deep: #050C14;
  --rock-grey: #2B3742;
  --rock-deep: #1B262F;
  --gold: #C9A227;
  --gold-light: #E8C55A;
  --cinnabar: #C44536;
  --cinnabar-ink: #E0705F;
  --celadon: #6FA893;
  --moss: #4E6B53;
  --moss-ink: #8FA98F;
  --terracotta: #9C5A3C;
  --terracotta-ink: #D8926F;
  --rice: #F3EFE6;
  --mist: #A8B4BE;
  --glass: rgba(255, 255, 255, 0.05);
  --hairline: rgba(201, 162, 39, 0.28);
  --line: rgba(168, 180, 190, 0.18);

  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", SimSun, Georgia, serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: min(1240px, calc(100% - 2.5rem));
  --radius: 2px;
  --header-h: 6.5rem;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-abyss);
  background-image:
    linear-gradient(to right, rgba(168, 180, 190, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(168, 180, 190, 0.05) 1px, transparent 1px),
    radial-gradient(120% 55% at 50% -8%, rgba(201, 162, 39, 0.10), transparent 62%);
  background-size: 88px 88px, 88px 88px, 100% 100%;
  background-repeat: repeat, repeat, no-repeat;
  color: var(--rice);
  font-family: var(--font-serif);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  line-height: 1.85;
}
h1, h2, h3, h4, h5 {
  font-family: var(--font-sans);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--rice);
  text-align: left;
}
h2 { font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2rem); }
h3 { font-size: 1.18rem; line-height: 1.4; }
p { text-wrap: pretty; }
::selection { background: rgba(201, 162, 39, 0.32); color: var(--rice); }
:focus-visible { outline: 2px solid var(--gold-light); outline-offset: 2px; }
.main-content a:not([class]) { color: var(--gold-light); border-bottom: 1px solid rgba(201, 162, 39, 0.4); }
.main-content a:not([class]):hover { border-bottom-color: var(--gold-light); }

/* ---------- 4. 通用工具 ---------- */
.shell { width: var(--shell); margin-inline: auto; }
.section { padding: clamp(2.5rem, 6vw, 5rem) 0; }
.main-content { display: block; min-height: 40vh; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.55rem;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.16em;
  color: var(--gold); text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--gold); }
.display {
  font-family: var(--font-sans); font-weight: 900; letter-spacing: -0.02em;
  line-height: 1.02; font-size: clamp(2.5rem, 8vw, 4.5rem);
}
.lead { font-size: clamp(1.02rem, 0.96rem + 0.3vw, 1.2rem); color: var(--mist); max-width: 62ch; line-height: 1.8; }
.prose { max-width: 72ch; }
.prose p + p, .prose ul + p, .prose p + ul { margin-top: 1.05em; }
.prose h2, .prose h3 { margin: 1.6em 0 0.5em; }
.stat { display: block; font-family: var(--font-mono); font-weight: 500; font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1; color: var(--gold-light); }
.stat__label { display: block; margin-top: 0.5rem; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.12em; color: var(--mist); }
.section-head {
  display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between;
  gap: 0.75rem 1.5rem; padding-bottom: 0.85rem; margin-bottom: clamp(1.25rem, 3vw, 2.25rem);
  border-bottom: 1px solid var(--line);
}
.section-head__title { font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2rem); }
.section-head__note { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--mist); }

/* ---------- 5. 网格 ---------- */
.grid { display: grid; gap: clamp(1rem, 2.2vw, 1.6rem); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.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-12 { grid-column: span 12; }

.layout {
  display: grid; grid-template-columns: minmax(200px, 3fr) 9fr;
  gap: clamp(1.5rem, 3vw, 3rem);
  width: var(--shell); margin-inline: auto;
  padding-block: 1.5rem 3rem;
}

/* ---------- 6. 按钮 / 标签 / 状态 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 0.5rem; padding: 0.62rem 1.05rem;
  font-family: var(--font-sans); font-weight: 800; font-size: 0.875rem; letter-spacing: 0.02em;
  border: 1px solid transparent; border-radius: var(--radius); white-space: nowrap;
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}
.btn--gold { background: var(--gold); color: var(--ink-abyss); border-color: var(--gold); }
.btn--gold:hover { background: var(--gold-light); border-color: var(--gold-light); }
.btn--ghost { background: var(--glass); color: var(--rice); border-color: var(--hairline); }
.btn--ghost:hover { border-color: var(--gold); color: var(--gold-light); }

.chip {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.2rem 0.55rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--glass);
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.06em; color: var(--mist);
}
.chip--ok { color: var(--celadon); border-color: rgba(111, 168, 147, 0.45); }
.chip--limited { color: var(--moss-ink); border-color: rgba(143, 169, 143, 0.4); }
.chip--alert { color: var(--cinnabar-ink); border-color: rgba(224, 112, 95, 0.5); }
.tag {
  display: inline-block; padding: 0.12rem 0.5rem;
  border: 1px solid rgba(156, 90, 60, 0.6); border-radius: var(--radius);
  background: rgba(156, 90, 60, 0.16);
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.06em; color: var(--terracotta-ink);
}
.notice {
  display: flex; gap: 0.75rem; align-items: baseline;
  padding: 0.85rem 1rem; border-left: 2px solid var(--cinnabar);
  background: rgba(196, 69, 54, 0.08);
  font-family: var(--font-sans); font-size: 0.94rem; line-height: 1.7;
}
.notice__label { flex: none; font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; color: var(--cinnabar-ink); }

/* ---------- 7. 卡片 ---------- */
.card {
  position: relative; padding: clamp(1.05rem, 2vw, 1.6rem);
  background: var(--ink-slate); border: 1px solid var(--line); border-radius: var(--radius);
}
.card--glass { background: var(--glass); border-color: var(--hairline); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }
.card--solid { background: var(--rock-grey); }
.card--gold { border-top: 2px solid var(--gold); }
.card--alert { border-left: 2px solid var(--cinnabar); }
.card__kicker { display: block; margin-bottom: 0.6rem; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.12em; color: var(--gold); }
.card__title { font-size: 1.18rem; margin-bottom: 0.45rem; }
.card__text { color: var(--mist); font-size: 0.96rem; max-width: 46ch; }
.card__meta {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem 0.75rem;
  margin-top: 1rem; padding-top: 0.8rem; border-top: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--mist);
}

/* ---------- 8. 数据行 ---------- */
.datalist { display: grid; border-top: 1px solid var(--line); }
.datalist__row {
  display: grid; grid-template-columns: minmax(6.5rem, auto) 1fr auto;
  gap: 0.5rem 1rem; align-items: baseline;
  padding: 0.75rem 0; border-bottom: 1px solid var(--line);
}
.datalist__key { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--mist); }
.datalist__val { font-family: var(--font-sans); font-weight: 700; color: var(--rice); }
.datalist__meta { font-family: var(--font-mono); font-size: 0.72rem; color: var(--celadon); }

/* ---------- 9. 可展开组（原生 details） ---------- */
.disclosure { border-bottom: 1px solid var(--line); }
.disclosure__summary {
  display: flex; align-items: baseline; gap: 1rem;
  padding: 1rem 0.15rem; cursor: pointer; list-style: none;
  font-family: var(--font-sans); font-weight: 800; font-size: 1.02rem; line-height: 1.5;
  transition: color .16s var(--ease);
}
.disclosure__summary::-webkit-details-marker { display: none; }
.disclosure__summary::after {
  content: "+"; margin-left: auto; font-family: var(--font-mono);
  color: var(--gold-light); font-size: 1.1rem; line-height: 1;
  transition: transform .24s var(--ease);
}
.disclosure__summary:hover { color: var(--gold-light); }
.disclosure[open] > .disclosure__summary::after { transform: rotate(45deg); }
.disclosure__body { padding: 0 0.15rem 1.2rem; color: var(--mist); max-width: 72ch; }

/* ---------- 10. 图片位 ---------- */
.media {
  position: relative; overflow: hidden; isolation: isolate;
  aspect-ratio: 16 / 10; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(145deg, var(--ink-slate), var(--rock-deep) 65%, #1A2530);
}
.media > img, .media > svg, .media > video { width: 100%; height: 100%; object-fit: cover; }
.media::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(243, 239, 230, 0.03) 0 1px, transparent 1px 3px);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }
.media--empty {
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--mist);
  background-image:
    repeating-linear-gradient(135deg, rgba(168, 180, 190, 0.06) 0 1px, transparent 1px 10px),
    linear-gradient(145deg, var(--ink-slate), var(--rock-deep));
}
.media__caption {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 1;
  padding: 0.7rem 0.85rem;
  background: linear-gradient(180deg, rgba(7, 19, 31, 0), rgba(7, 19, 31, 0.92));
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.04em; color: var(--mist);
}
.media__tag { position: absolute; top: 0.7rem; left: 0.7rem; z-index: 1; }

/* ---------- 11. 左侧短路径索引 ---------- */
.rail {
  position: sticky; top: calc(var(--header-h) + 1rem);
  align-self: start;
  padding-left: 1rem; border-left: 1px solid var(--hairline);
}
.rail__label { margin-bottom: 0.85rem; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em; color: var(--mist); }
.rail__list { display: grid; gap: 0.1rem; }
.rail__link {
  position: relative; display: block;
  padding: 0.42rem 0 0.42rem 0.95rem;
  font-family: var(--font-sans); font-weight: 700; font-size: 0.92rem; color: var(--mist);
  transition: color .16s var(--ease);
}
.rail__link::before {
  content: ""; position: absolute; left: 0; top: 50%;
  width: 6px; height: 1px; background: rgba(168, 180, 190, 0.5);
  transform: translateY(-50%);
  transition: width .16s var(--ease), background-color .16s var(--ease), height .16s var(--ease);
}
.rail__link:hover { color: var(--rice); }
.rail__link:hover::before { width: 11px; background: var(--gold-light); }
.rail__link.is-active, .rail__link[aria-current="page"] { color: var(--gold-light); }
.rail__link.is-active::before, .rail__link[aria-current="page"]::before { width: 14px; height: 2px; background: var(--gold); }
.rail__meta {
  margin-top: 1rem; padding-top: 0.75rem; border-top: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 0.7rem; line-height: 1.7; color: var(--mist);
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem;
  padding: 1.1rem 0 0;
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.05em; color: var(--mist);
}
.breadcrumb a { color: var(--mist); border-bottom: 1px solid transparent; }
.breadcrumb a:hover { color: var(--gold-light); border-bottom-color: var(--hairline); }
.breadcrumb__sep { color: rgba(168, 180, 190, 0.45); }
.breadcrumb [aria-current="page"] { color: var(--rice); }

/* ---------- 13. 跳过链接 ---------- */
.skip-link {
  position: fixed; top: 0.75rem; left: 0.75rem; z-index: 300;
  padding: 0.65rem 1.1rem;
  background: var(--gold); color: var(--ink-abyss);
  font-family: var(--font-sans); font-weight: 900; font-size: 0.85rem;
  border-radius: var(--radius);
  transform: translateY(-220%);
  transition: transform .16s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 14. 头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(7, 19, 31, 0.9);
  -webkit-backdrop-filter: blur(16px) saturate(130%);
  backdrop-filter: blur(16px) saturate(130%);
  border-bottom: 1px solid var(--line);
}
.header-strip {
  width: var(--shell); margin-inline: auto;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(168, 180, 190, 0.12);
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em; color: var(--mist);
}
.header-strip__note { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.site-header__inner {
  width: var(--shell); margin-inline: auto;
  display: flex; align-items: center; gap: 1rem;
  min-height: 64px; padding-block: 0.5rem;
}
.read-progress {
  position: absolute; left: 0; bottom: -1px; z-index: 2;
  width: 100%; height: 2px;
  transform: scaleX(var(--progress, 0)); transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--celadon), var(--gold), var(--cinnabar));
  transition: transform .12s linear;
  pointer-events: none;
}

.brand { display: flex; align-items: center; gap: 0.7rem; flex-shrink: 0; }
.brand__mark {
  display: grid; place-items: center; width: 34px; height: 34px;
  border: 1px solid var(--hairline); border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(201, 162, 39, 0.22), rgba(196, 69, 54, 0.12));
  color: var(--gold-light); font-family: var(--font-sans); font-weight: 900; font-size: 1rem; line-height: 1;
}
.brand__text { display: block; }
.brand__name { display: block; font-family: var(--font-sans); font-weight: 900; font-size: 1.05rem; line-height: 1.2; letter-spacing: 0.01em; color: var(--rice); }
.brand__line { display: block; font-family: var(--font-mono); font-size: 0.68rem; line-height: 1.4; letter-spacing: 0.08em; color: var(--mist); }

.status-hint {
  display: inline-flex; align-items: center; gap: 0.45rem;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--celadon);
}
.status-hint--muted { color: var(--moss-ink); }
.status-dot { flex: none; width: 6px; height: 6px; border-radius: 50%; background: var(--celadon); box-shadow: 0 0 0 3px rgba(111, 168, 147, 0.18); }
.status-hint--muted .status-dot { background: var(--moss-ink); box-shadow: 0 0 0 3px rgba(143, 169, 143, 0.16); }

.site-nav { margin-left: auto; }
.site-nav__list { display: flex; align-items: center; gap: 0.15rem; }
.site-nav__link {
  display: flex; align-items: baseline; gap: 0.35rem;
  padding: 0.5rem 0.7rem;
  font-family: var(--font-sans); font-weight: 700; font-size: 0.9rem; color: var(--mist);
  border: 1px solid transparent; border-radius: var(--radius);
  transition: color .16s var(--ease), background-color .16s var(--ease), border-color .16s var(--ease);
}
.site-nav__idx { font-family: var(--font-mono); font-weight: 500; font-size: 0.66rem; color: rgba(168, 180, 190, 0.55); }
.site-nav__link:hover { color: var(--rice); background: var(--glass); border-color: var(--hairline); }
.site-nav__link[aria-current="page"] {
  color: var(--gold-light);
  background: rgba(201, 162, 39, 0.1);
  border-color: var(--hairline);
  box-shadow: inset 0 -2px 0 var(--gold);
}
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--gold); }
.site-nav__cta { display: none; }

.header-cta { flex: none; }

.nav-toggle {
  display: none; align-items: center; gap: 0.5rem;
  margin-left: auto; padding: 0.5rem 0.7rem;
  border: 1px solid var(--hairline); border-radius: var(--radius);
  background: var(--glass); color: var(--rice);
  font-family: var(--font-sans); font-weight: 700; font-size: 0.78rem;
  transition: border-color .16s var(--ease), color .16s var(--ease);
}
.nav-toggle:hover { border-color: var(--gold); color: var(--gold-light); }
.nav-toggle__bars { display: grid; gap: 4px; width: 16px; }
.nav-toggle__bars span { display: block; height: 1.5px; background: var(--gold-light); transition: transform .16s var(--ease), opacity .16s var(--ease); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* ---------- 15. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 6vw, 5rem);
  background: linear-gradient(180deg, rgba(14, 31, 48, 0.92), var(--ink-deep) 72%);
  border-top: 1px solid var(--hairline);
  color: var(--mist);
}
.site-footer::before {
  content: ""; position: absolute; top: -1px; left: 0; right: 0; height: 1px;
  background: repeating-linear-gradient(90deg, var(--gold) 0 24px, transparent 24px 48px);
  opacity: 0.55;
}
.site-footer__top {
  width: var(--shell); margin-inline: auto;
  display: grid; gap: clamp(1.5rem, 3vw, 2.5rem);
  grid-template-columns: 1.5fr repeat(3, 1fr) 1.4fr;
  padding: clamp(2.25rem, 5vw, 3.5rem) 0 clamp(1.5rem, 3vw, 2.5rem);
}
.footer-brand__name { font-family: var(--font-sans); font-weight: 900; font-size: 1.35rem; letter-spacing: -0.01em; color: var(--rice); line-height: 1.25; }
.footer-brand__line { margin-top: 0.35rem; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--gold); }
.footer-brand__note { margin-top: 0.9rem; max-width: 34ch; font-size: 0.92rem; line-height: 1.75; color: var(--mist); }
.footer-brand .status-hint { margin-top: 1rem; }

.footer-col__title {
  padding-bottom: 0.7rem; margin-bottom: 0.8rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-weight: 500; font-size: 0.72rem; letter-spacing: 0.14em; color: var(--mist);
}
.footer-col__list { display: grid; gap: 0.1rem; }
.footer-col__link {
  display: inline-block; padding: 0.35rem 0;
  font-family: var(--font-sans); font-weight: 700; font-size: 0.92rem; color: var(--rice); opacity: 0.86;
  transition: color .16s var(--ease), transform .16s var(--ease), opacity .16s var(--ease);
}
.footer-col__link:hover { color: var(--gold-light); opacity: 1; transform: translateX(3px); }

.footer-contact { display: grid; gap: 0.85rem; }
.footer-contact__row { display: grid; gap: 0.2rem; }
.footer-contact__key { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; color: var(--mist); }
.footer-contact__val { font-family: var(--font-mono); font-size: 0.85rem; line-height: 1.6; color: var(--rice); word-break: break-word; }

.site-footer__legal {
  width: var(--shell); margin-inline: auto;
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 1.5rem;
  padding: 1.1rem 0 1.6rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; color: var(--mist);
}
.legal-copy { color: var(--mist); }
.legal-links { display: flex; flex-wrap: wrap; gap: 1rem; }
.legal-links a { color: var(--mist); transition: color .16s var(--ease); }
.legal-links a:hover { color: var(--gold-light); }
.legal-icp { margin-left: auto; color: var(--mist); }

/* ---------- 16. 进入动画 ---------- */
.js [data-reveal] { opacity: 0; transform: translateY(8px); }
[data-reveal] { transition: opacity .32s var(--ease), transform .32s var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1100px) {
  .site-footer__top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-connect { grid-column: span 2; }
}
@media (max-width: 1023px) {
  :root { --header-h: 5.5rem; }
  .header-strip__note { display: none; }
  .header-strip { justify-content: flex-start; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute; left: 0; right: 0; top: 100%;
    display: none;
    margin-left: 0;
    padding: 1rem 1.25rem 1.4rem;
    background: rgba(9, 24, 38, 0.98);
    border-bottom: 1px solid var(--hairline);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  }
  .site-nav[data-open] { display: block; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__item + .site-nav__item { border-top: 1px solid rgba(168, 180, 190, 0.1); }
  .site-nav__link { padding: 0.8rem 0.5rem; font-size: 1rem; border: 0; border-radius: 0; }
  .site-nav__link[aria-current="page"] { box-shadow: inset 2px 0 0 var(--gold); background: rgba(201, 162, 39, 0.08); }
  .site-nav__cta { display: inline-flex; width: 100%; margin-top: 1.1rem; }

  .layout { grid-template-columns: minmax(0, 1fr); padding-block: 1rem 3rem; }
  .rail { position: static; padding: 0.75rem 0 0; border-left: 0; border-top: 1px solid var(--hairline); }
  .rail__label { margin-bottom: 0.6rem; }
  .rail__list { display: flex; gap: 0.5rem; overflow-x: auto; padding-bottom: 0.45rem; }
  .rail__link {
    padding: 0.45rem 0.85rem; white-space: nowrap; font-size: 0.85rem;
    border: 1px solid var(--line); border-radius: 999px;
  }
  .rail__link::before { display: none; }
  .rail__link:hover { background: var(--glass); }
  .rail__link.is-active, .rail__link[aria-current="page"] { border-color: var(--gold); background: rgba(201, 162, 39, 0.12); }
  .rail__meta { display: none; }

  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-4, .col-5, .col-6 { grid-column: span 3; }
  .col-7, .col-8 { grid-column: span 6; }
}
@media (max-width: 720px) {
  .legal-icp { margin-left: 0; }
}
@media (max-width: 640px) {
  :root { --shell: min(1240px, calc(100% - 1.75rem)); }
  body { line-height: 1.8; }
  .grid--2, .grid--3, .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .col-4, .col-5, .col-6, .col-7, .col-8, .col-12 { grid-column: span 1; }
  .site-footer__top { grid-template-columns: minmax(0, 1fr); }
  .footer-connect { grid-column: span 1; }
  .datalist__row { grid-template-columns: minmax(0, 1fr); gap: 0.2rem; }
  .datalist__meta { color: var(--celadon); }
}

/* ---------- 18. 专注态与减弱动效 ---------- */
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--gold-light); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .js [data-reveal], [data-reveal] { opacity: 1 !important; transform: none !important; }
  .read-progress { transition: none; }
}