/* ============================================================
   178体育安装 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 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, figcaption, blockquote, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; border-spacing: 0; }
h1, h2, h3, h4 { font-weight: 800; letter-spacing: -0.02em; line-height: 1.06; }

/* ---------- 2. 变量 ---------- */
:root {
  --bg: #0A1410;
  --bg-2: #111614;
  --panel: #16211C;
  --line: #243029;
  --lime: #C8FF3D;
  --lime-2: #8FBF2A;
  --amber: #FFA51F;
  --amber-2: #B86F12;
  --deep: #0F3B2A;
  --ink: #EAF3EC;
  --ink-2: #93A79A;
  --ink-3: #5F7368;

  --mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --w: 1280px;
  --gutter: clamp(16px, 3vw, 40px);
  --shell-pad: 0px;
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--bg);
  background-image: radial-gradient(1200px 620px at 12% -12%, rgba(15, 59, 42, 0.55), rgba(15, 59, 42, 0) 62%);
  background-repeat: no-repeat;
  background-position: 0 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
p, li { text-wrap: pretty; }
strong, b { font-weight: 700; }
:focus-visible { outline: 2px solid var(--lime); outline-offset: 2px; }

/* 文字工具 */
.display { font-size: clamp(52px, 9vw, 96px); font-weight: 800; letter-spacing: -0.045em; line-height: 0.98; }
.title-xl { font-size: clamp(34px, 5.4vw, 48px); font-weight: 800; letter-spacing: -0.035em; line-height: 1.02; }
.title-l { font-size: clamp(26px, 3.6vw, 34px); font-weight: 800; letter-spacing: -0.03em; line-height: 1.08; }
.title-m { font-size: clamp(20px, 2.6vw, 26px); font-weight: 800; letter-spacing: -0.025em; line-height: 1.12; }
.title-s { font-size: 18px; font-weight: 800; letter-spacing: -0.01em; line-height: 1.25; }
.lead { font-size: clamp(17px, 1.6vw, 19px); line-height: 1.7; color: var(--ink); max-width: 42ch; }
.body-text { font-size: 16.5px; line-height: 1.75; max-width: 36ch; color: var(--ink-2); }
.body-text--wide { max-width: 62ch; }
.note { font-size: 13px; line-height: 1.6; color: var(--ink-2); }
.eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }
.accent-lime { color: var(--lime); }
.accent-amber { color: var(--amber); }
.hl { background-image: linear-gradient(transparent 62%, rgba(200, 255, 61, 0.28) 62%); }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

/* ---------- 4. 布局工具 ---------- */
.container { width: 100%; max-width: var(--w); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }
.container--narrow { max-width: 760px; }
.section { position: relative; padding: clamp(56px, 8vw, 104px) 0; }
.section--tight { padding: clamp(32px, 4vw, 56px) 0; }
.grid-12 { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(18px, 2vw, 28px); }
.col-3 { grid-column: span 3; } .col-4 { grid-column: span 4; } .col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; } .col-9 { grid-column: span 9; } .col-12 { grid-column: span 12; }
.layout-rail { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: clamp(22px, 3vw, 44px); align-items: start; }
.stack > * + * { margin-top: var(--stack, 16px); }
.rule { border: 0; height: 1px; background: var(--line); }
.grid-field {
  background-image:
    linear-gradient(to right, rgba(36, 48, 41, 0.7) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 48, 41, 0.7) 1px, transparent 1px);
  background-size: 24px 24px, 24px 24px;
}
.edge-cut { height: 1px; background: var(--line); transform: skewY(-1.2deg); transform-origin: left center; }
.slant-block {
  background: var(--deep);
  color: var(--lime);
  padding: clamp(34px, 5vw, 56px) clamp(20px, 4vw, 40px);
  clip-path: polygon(0 34px, 100% 0, 100% calc(100% - 34px), 0 100%);
}
.scroll-progress {
  position: fixed; top: 0; left: 0; z-index: 90; width: 0; height: 3px;
  background: linear-gradient(90deg, var(--lime), var(--amber));
  pointer-events: none;
}

/* ---------- 5. 跳过链接 ---------- */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--lime); color: #0A1410;
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.08em;
  padding: 10px 16px;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ---------- 6. 头部框架 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.site-header__spine {
  position: fixed; left: 0; top: 0; bottom: 0; width: 1px;
  background: var(--line); z-index: 45; pointer-events: none;
}
.site-header__spine::before {
  content: ""; position: absolute; left: 0; top: 0; width: 1px; height: 96px; background: var(--lime);
}
.site-header__bar {
  position: relative;
  width: 100%; max-width: var(--w); margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 64px;
  display: flex; align-items: stretch;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 22px 11px 0;
  border-right: 1px solid var(--line);
  flex: 0 0 auto;
}
.brand__mark {
  display: grid; place-items: center;
  width: 38px; height: 38px;
  background: var(--lime); color: #0A1410;
  font-family: var(--mono); font-size: 15px; font-weight: 700; letter-spacing: -0.04em;
}
.brand__text { display: flex; flex-direction: column; gap: 3px; }
.brand__name { font-size: 17px; font-weight: 800; letter-spacing: 0.01em; line-height: 1; color: var(--ink); }
.brand__sub { font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.22em; color: var(--ink-3); line-height: 1; }

.site-nav { flex: 1 1 auto; display: flex; align-items: stretch; padding-left: 6px; }
.site-nav__list { display: flex; align-items: stretch; gap: 2px; }
.site-nav__link {
  display: flex; align-items: center; gap: 8px;
  height: 100%; padding: 0 15px;
  color: var(--ink-2); font-size: 15px; font-weight: 600; letter-spacing: 0.01em;
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}
.site-nav__idx { font-family: var(--mono); font-size: 10px; letter-spacing: 0.12em; color: var(--ink-3); }
.site-nav__link:hover { color: var(--ink); background: var(--panel); }
.site-nav__link:hover .site-nav__idx { color: var(--lime-2); }
.site-nav__link[aria-current="page"] {
  color: var(--lime);
  border-bottom-color: var(--lime);
  background: linear-gradient(to bottom, rgba(200, 255, 61, 0) 40%, rgba(200, 255, 61, 0.09));
}
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--lime); }

.header-tools { display: flex; align-items: center; gap: 10px; padding-left: 18px; border-left: 1px solid var(--line); flex: 0 0 auto; }

.nav-toggle {
  display: none; align-items: center; gap: 10px;
  background: var(--panel); border: 1px solid var(--line); color: var(--ink);
  padding: 9px 13px; cursor: pointer;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.14em;
}
.nav-toggle:hover { border-color: var(--lime-2); color: var(--lime); }
.nav-toggle__bars { display: flex; flex-direction: column; gap: 3px; }
.nav-toggle__bars i { display: block; width: 16px; height: 2px; background: currentColor; }
.nav-toggle[aria-expanded="true"] { color: var(--lime); border-color: var(--lime); }
.nav-toggle__label { line-height: 1; }

.status-bar { background: var(--bg-2); border-bottom: 1px solid var(--line); }
.status-bar__list {
  max-width: var(--w); margin: 0 auto; padding: 0 var(--gutter);
  display: flex; flex-wrap: wrap; align-items: center;
}
.status-bar__item {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 18px 7px 0;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.08em; color: var(--ink-2);
}
.status-bar__item + .status-bar__item { border-left: 1px solid var(--line); padding-left: 18px; }
.status-bar__key { color: var(--ink-3); text-transform: uppercase; }
.status-bar__val { color: var(--ink); }
.status-bar__val--live { color: var(--lime); display: inline-flex; align-items: center; gap: 7px; }
.dot { width: 6px; height: 6px; background: var(--lime); display: inline-block; animation: pulse 2.2s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px;
  background: var(--panel); border: 1px solid var(--line); color: var(--ink);
  font-family: var(--sans); font-size: 14px; font-weight: 700; letter-spacing: 0.02em; line-height: 1;
  border-radius: 0; cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn:hover { border-color: var(--lime-2); color: var(--lime); }
.btn--primary { background: var(--lime); border-color: var(--lime); color: #0A1410; }
.btn--primary:hover { background: #D8FF6E; border-color: #D8FF6E; color: #0A1410; }
.btn--ghost { background: transparent; color: var(--ink-2); }
.btn--ghost:hover { background: var(--panel); color: var(--ink); border-color: var(--lime-2); }
.btn--amber { background: transparent; border-color: var(--amber-2); color: var(--amber); }
.btn--amber:hover { background: var(--amber-2); border-color: var(--amber); color: #0A1410; }
.btn--sm { padding: 7px 12px; font-size: 12.5px; }
.btn--block { width: 100%; }

/* ---------- 8. 通用组件 ---------- */
.panel { background: var(--panel); border: 1px solid var(--line); padding: 24px; }
.panel--flat { padding: 0; background: var(--bg-2); }
.panel__head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 13px 18px; border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-2);
}
.panel__body { padding: 18px; }

.section-head {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 14px;
  padding-bottom: 14px; margin-bottom: 28px; border-bottom: 1px solid var(--line);
}
.section-head__idx { font-family: var(--mono); font-size: 11px; letter-spacing: 0.22em; color: var(--lime); }
.section-head__title { font-size: clamp(22px, 3vw, 28px); font-weight: 800; letter-spacing: -0.025em; line-height: 1.06; }
.section-head__note { margin-left: auto; font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; color: var(--ink-2); }

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 8px; background: var(--bg-2); border: 1px solid var(--line);
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-2);
}
.tag--lime { color: var(--lime); border-color: var(--lime-2); background: rgba(200, 255, 61, 0.07); }
.tag--amber { color: var(--amber); border-color: var(--amber-2); background: rgba(255, 165, 31, 0.07); }

.breadcrumbs {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-2);
}
.breadcrumbs__item { display: flex; align-items: center; gap: 8px; }
.breadcrumbs__item + .breadcrumbs__item::before { content: "/"; color: var(--ink-3); }
.breadcrumbs a:hover { color: var(--lime); }

.filter-bar {
  display: flex; flex-wrap: wrap; gap: 8px;
  padding: 12px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.filter-btn {
  padding: 7px 14px; background: transparent; border: 1px solid var(--line); color: var(--ink-2);
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase;
  cursor: pointer; transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}
.filter-btn:hover { color: var(--ink); border-color: var(--lime-2); }
.filter-btn[aria-pressed="true"] { background: var(--deep); border-color: var(--lime); color: var(--lime); }
[data-filter-item].is-hidden { display: none !important; }

.timeline { display: flex; flex-direction: column; border-left: 1px solid var(--line); }
.timeline__item {
  position: relative; display: block; width: 100%; text-align: left;
  padding: 14px 0 14px 22px; border-bottom: 1px solid var(--line);
  background: transparent; border-left: 0; border-right: 0; border-top: 0; color: inherit; cursor: pointer;
}
.timeline__item::before {
  content: ""; position: absolute; left: -4px; top: 22px; width: 7px; height: 7px; background: var(--line);
}
.timeline__item:hover::before { background: var(--lime-2); }
.timeline__item[aria-current="true"]::before { background: var(--lime); }
.timeline__item[aria-current="true"] { background: rgba(200, 255, 61, 0.05); }
.timeline__time { display: block; font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; color: var(--amber); }
.timeline__text { display: block; font-size: 14.5px; color: var(--ink); }

.stat-row {
  display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center; gap: 12px;
  padding: 11px 0; border-bottom: 1px solid var(--line);
}
.stat-row__key { font-size: 13px; color: var(--ink-2); }
.stat-row__label { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); text-align: center; }
.stat-row__val { font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: 16px; text-align: right; }
.stat-row__val--a { color: var(--lime); }
.stat-row__val--b { color: var(--amber); }

.metric { display: flex; flex-direction: column; gap: 8px; }
.metric__value { font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: clamp(30px, 4.4vw, 46px); font-weight: 700; line-height: 1; letter-spacing: -0.03em; color: var(--ink); }
.metric__label { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-2); }
.metric__delta { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.06em; color: var(--amber); }

.bar { display: block; }
.bar__track { position: relative; height: 8px; background: var(--bg); border: 1px solid var(--line); overflow: hidden; }
.bar__fill { display: block; height: 100%; width: var(--v, 50%); background: var(--lime); }
.bar__fill--alt { background: var(--amber); }

.card {
  position: relative; display: flex; flex-direction: column;
  background: var(--panel); border: 1px solid var(--line);
  transition: border-color 0.18s ease, transform 0.18s ease;
}
.card:hover, .card:focus-within { border-color: var(--lime-2); transform: translateY(-2px); }
.card__media { aspect-ratio: 16 / 9; overflow: hidden; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.card__media > img, .card__media > svg { width: 100%; height: 100%; object-fit: cover; }
.card__body { padding: 16px 18px 18px; display: flex; flex-direction: column; gap: 8px; }
.card__title { font-size: 17px; font-weight: 800; letter-spacing: -0.015em; line-height: 1.25; }
.card__meta { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.1em; color: var(--ink-2); }
.card__extra {
  max-height: 0; opacity: 0; overflow: hidden; border-top: 1px solid transparent;
  padding: 0 18px; font-family: var(--mono); font-size: 12px; color: var(--ink-2);
  transition: max-height 0.25s ease, opacity 0.2s ease, padding 0.2s ease, border-color 0.2s ease;
}
.card:hover .card__extra, .card:focus-within .card__extra {
  max-height: 90px; opacity: 1; padding: 10px 18px; border-top-color: var(--line);
}

.figure { display: flex; flex-direction: column; gap: 10px; }
.figure__frame {
  position: relative; aspect-ratio: 16 / 9; overflow: hidden;
  border: 1px solid var(--line); background: var(--bg-2);
}
.figure__frame::before {
  content: ""; position: absolute; inset: 0;
  background-image: repeating-linear-gradient(135deg, rgba(36, 48, 41, 0.85) 0 8px, rgba(22, 33, 28, 0) 8px 16px);
}
.figure__img { position: relative; z-index: 1; width: 100%; height: 100%; object-fit: cover; }
.figure__caption { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.08em; color: var(--ink-2); }
.figure--wide .figure__frame { aspect-ratio: 21 / 9; }
.figure--tall .figure__frame { aspect-ratio: 3 / 4; }
.figure--square .figure__frame { aspect-ratio: 1 / 1; }

.table-scroll { width: 100%; overflow-x: auto; border: 1px solid var(--line); }
.data-table { width: 100%; min-width: 520px; font-size: 14px; }
.data-table th, .data-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--line); }
.data-table th {
  background: var(--bg-2); color: var(--ink-2);
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; font-weight: 400;
}
.data-table td.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.data-table tbody tr:hover { background: rgba(200, 255, 61, 0.05); }
.data-table tr:last-child td { border-bottom: 0; }

.view-a-only, .view-b-only { transition: opacity 0.2s ease; }
[data-view="a"] .view-b-only, [data-view="b"] .view-a-only { display: none !important; }

/* ---------- 9. 显现动效 ---------- */
html.js [data-reveal] { opacity: 0; transform: translateY(12px); transition: opacity 0.5s ease, transform 0.5s ease; }
html.js [data-reveal].is-revealed { opacity: 1; transform: none; }

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative; z-index: 1;
  margin-top: clamp(64px, 9vw, 120px);
  background: var(--bg-2);
  border-top: 1px solid var(--line);
}
.site-footer__intro {
  max-width: var(--w); margin: 0 auto;
  padding: 34px var(--gutter) 26px;
  display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 20px;
  border-bottom: 1px solid var(--line);
}
.footer-brand { font-size: clamp(22px, 2.6vw, 28px); font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; color: var(--ink); }
.footer-brand__tag { margin-top: 8px; font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.24em; text-transform: uppercase; color: var(--ink-3); }
.site-footer__grid {
  max-width: var(--w); margin: 0 auto; padding: 0 var(--gutter);
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
}
.footer-col { padding: 28px 26px 34px 0; border-right: 1px solid var(--line); }
.footer-col:last-child { border-right: 0; padding-right: 0; padding-left: 26px; }
.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--lime); font-weight: 400;
}
.footer-list { display: flex; flex-direction: column; gap: 10px; }
.footer-list a { font-size: 14.5px; color: var(--ink-2); border-bottom: 1px solid transparent; transition: color 0.18s ease, border-color 0.18s ease; }
.footer-list a:hover { color: var(--lime); border-bottom-color: var(--lime-2); }
.footer-list--contact li { display: grid; grid-template-columns: 42px minmax(0, 1fr); gap: 10px; align-items: baseline; }
.footer-key { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); }
.footer-value { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.01em; color: var(--ink); word-break: break-word; line-height: 1.6; }
.footer-plain { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.06em; color: var(--ink-2); }
.site-footer__base { border-top: 1px solid var(--line); background: #0D1311; }
.site-footer__base-inner {
  max-width: var(--w); margin: 0 auto; padding: 15px var(--gutter);
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px;
}
.footer-base__copy { font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em; color: var(--ink-2); }
.footer-base__link {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--lime); border-bottom: 1px solid var(--lime-2); padding-bottom: 2px;
}
.footer-base__link:hover { color: var(--amber); border-bottom-color: var(--amber); }

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1040px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-3, .col-4, .col-6, .col-8, .col-9 { grid-column: span 6; }
  .layout-rail { grid-template-columns: minmax(0, 1fr); }
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col { padding: 26px 22px 30px 22px; }
  .footer-col:nth-child(odd) { padding-left: 0; }
  .footer-col:nth-child(even) { border-right: 0; padding-right: 0; }
  .footer-col:nth-child(n + 3) { border-top: 1px solid var(--line); }
  .footer-col:last-child { padding-left: 22px; }
}

@media (max-width: 1039px) {
  /* 无 JS 兜底：导航平铺在横条下方 */
  .site-header__bar { flex-wrap: wrap; }
  .site-nav { order: 4; flex-basis: 100%; display: block; padding: 0; border-top: 1px solid var(--line); }
  .site-nav__list { flex-direction: column; gap: 0; }
  .site-nav__link { height: auto; padding: 13px var(--gutter); border-bottom: 1px solid var(--line); }
  .site-nav__link[aria-current="page"] { background: rgba(200, 255, 61, 0.07); }

  /* 有 JS：导航折叠为下拉面板 */
  html.js .nav-toggle { display: inline-flex; order: 3; margin-left: auto; align-self: center; }
  html.js .header-tools { order: 2; border-left: 0; padding-left: 0; margin-left: 10px; }
  html.js .brand { border-right: 0; padding-right: 10px; }
  html.js .site-nav {
    position: absolute; top: 100%; left: 0; right: 0; z-index: 70;
    background: var(--bg-2);
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
    max-height: 72vh; overflow-y: auto;
  }
  html.js .site-nav[data-open] { transform: none; opacity: 1; visibility: visible; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .brand__sub { display: none; }
  .brand__mark { width: 34px; height: 34px; font-size: 13.5px; }
  .brand__name { font-size: 16px; }
  .brand { padding-right: 8px; }
  .header-tools .btn--ghost { display: none; }
  .header-tools .btn--primary { padding: 8px 11px; font-size: 12.5px; }
  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 9px 10px; }
  .status-bar__list { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
  .status-bar__list::-webkit-scrollbar { display: none; }
  .status-bar__item { padding: 6px 14px 6px 0; font-size: 10.5px; white-space: nowrap; }
  .status-bar__item + .status-bar__item { padding-left: 14px; }
  .site-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .footer-col { padding: 22px 0 24px 0; border-right: 0; }
  .footer-col:not(:first-child) { border-top: 1px solid var(--line); }
  .footer-col:last-child { padding-left: 0; }
  .footer-col:nth-child(n + 3) { border-top: 1px solid var(--line); }
  .site-footer__intro { padding-top: 26px; padding-bottom: 22px; }
  .section-head__note { margin-left: 0; }
}

/* ---------- 12. 无障碍与减弱动效 ---------- */
@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;
  }
  html.js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .card:hover, .card:focus-within { transform: none; }
}