/* =========================================================
   尊龙A9旗舰厅 · 共享样式表 /assets/site.css
   深墨蓝底 · 熔金强调 · 侧边轨道导航 · 编辑部目录节奏
   ========================================================= */

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0E1B33;
  --ink-deep: #0A1526;
  --ink-soft: #12203C;
  --gold: #C9A24B;
  --gold-soft: #E6CE8C;
  --gold-deep: #8C6A22;
  --silver: #C4CCD9;
  --pearl: #F5F7FA;
  --cyan: #3FD0C9;
  --orange: #F08A3C;
  --paper: #EFE7D8;
  --line: #1C1A17;

  --rail-w: 280px;
  --gutter: clamp(18px, 4vw, 56px);
  --maxw: 1240px;
  --r: 4px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --hair: rgba(201, 162, 75, .3);
  --hair-cool: rgba(196, 204, 217, .16);
  --shadow-stack: 0 1px 0 rgba(28, 26, 23, .55), 0 16px 32px -20px rgba(0, 0, 0, .8);

  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

/* ---------- 3. 基础排版与色彩节奏 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--silver);
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 560px at 84% -10%, rgba(201, 162, 75, .14), transparent 62%),
    radial-gradient(820px 520px at 2% 16%, rgba(63, 208, 201, .09), transparent 60%),
    linear-gradient(180deg, #0E1B33 0%, #0B1730 62%, #0A1526 100%);
  background-repeat: no-repeat;
  min-height: 100vh;
}
h1, h2, h3, h4 { font-weight: 800; letter-spacing: .04em; color: var(--pearl); line-height: 1.24; }
h1 { font-size: clamp(2rem, 4.4vw, 4rem); }
h2 { font-size: clamp(1.45rem, 2.6vw, 2.25rem); }
h3 { font-size: clamp(1.12rem, 1.7vw, 1.5rem); }
h4 { font-size: 1.05rem; letter-spacing: .06em; }
p { max-width: 74ch; }
strong { color: var(--pearl); font-weight: 800; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 2px; }

.skip-link {
  position: fixed; left: 14px; top: 14px; z-index: 300;
  padding: .62rem 1.05rem; border-radius: var(--r);
  background: var(--gold); color: var(--ink-deep);
  font-size: 14px; font-weight: 800; letter-spacing: .06em;
  transform: translateY(-180%); transition: transform .18s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.link-inline {
  background-image: linear-gradient(90deg, var(--cyan), var(--gold));
  background-size: 0% 1px; background-position: 0 100%; background-repeat: no-repeat;
  transition: background-size .22s var(--ease), color .18s var(--ease);
}
.link-inline:hover { background-size: 100% 1px; color: var(--pearl); }

/* ---------- 4. 头部外壳：移动顶栏 / 桌面侧边轨道 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px var(--gutter);
  background: rgba(10, 21, 38, .95);
  border-bottom: 1px solid var(--hair);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}
.header-top { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex: 1 1 auto; min-width: 0; }

.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-mark {
  display: grid; place-items: center; flex: 0 0 auto;
  width: 38px; height: 38px; border-radius: var(--r);
  border: 1px solid rgba(201, 162, 75, .62);
  background: linear-gradient(150deg, rgba(201, 162, 75, .26), rgba(63, 208, 201, .1));
  font-family: var(--font-mono); font-size: 13px; font-weight: 700;
  color: var(--gold-soft); letter-spacing: .02em;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.brand:hover .brand-mark { border-color: var(--gold); color: var(--pearl); }
.brand-text { display: flex; flex-direction: column; line-height: 1.28; min-width: 0; }
.brand-name { font-size: 15px; font-weight: 800; letter-spacing: .06em; color: var(--pearl); }
.brand-tagline { display: none; font-size: 11.5px; letter-spacing: .16em; color: rgba(196, 204, 217, .7); }

.header-announce { display: none; }

.nav-toggle {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px; padding: 0 11px; flex: 0 0 auto;
  border: 1px solid rgba(201, 162, 75, .45); border-radius: var(--r);
  background: rgba(201, 162, 75, .08);
}
.nav-toggle-bars { display: block; width: 20px; height: 2px; background: var(--gold-soft); transition: transform .2s var(--ease), opacity .2s var(--ease); }
.site-header[data-open] .nav-toggle-bars:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle-bars:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.site-nav {
  position: fixed; top: 0; left: 0; bottom: 0; z-index: 120;
  width: min(86vw, 344px);
  display: flex; flex-direction: column;
  padding: 76px 20px 96px;
  background: var(--ink-deep);
  border-right: 1px solid var(--hair);
  transform: translateX(-103%);
  transition: transform .26s var(--ease);
  overflow-y: auto;
}
.site-header[data-open] .site-nav { transform: translateX(0); }

.nav-track { display: flex; flex-direction: column; counter-reset: rail; }
.nav-track > li { border-bottom: 1px solid var(--hair-cool); }
.nav-link {
  display: flex; align-items: baseline; gap: 10px;
  padding: 13px 2px; font-size: 15px; font-weight: 700; letter-spacing: .03em;
  color: var(--silver);
  background-image: linear-gradient(90deg, rgba(201, 162, 75, .9), rgba(63, 208, 201, .9));
  background-size: 0% 2px; background-position: 0 100%; background-repeat: no-repeat;
  transition: background-size .22s var(--ease), color .18s var(--ease);
}
.nav-link::before {
  counter-increment: rail; content: counter(rail, decimal-leading-zero);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0;
  color: rgba(201, 162, 75, .8); flex: 0 0 auto;
}
.nav-link:hover { color: var(--pearl); background-size: 100% 2px; }
.nav-link[aria-current="page"] { color: var(--gold-soft); background-size: 100% 2px; }

.nav-foot { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--hair); }
.nav-foot-note { margin-top: 10px; font-size: 12px; letter-spacing: .04em; color: rgba(196, 204, 217, .68); }

.nav-scrim {
  position: fixed; inset: 0; z-index: 110;
  background: rgba(10, 21, 38, .74);
  opacity: 0; visibility: hidden;
  transition: opacity .24s var(--ease), visibility .24s var(--ease);
}
.site-header[data-open] .nav-scrim { opacity: 1; visibility: visible; }

.header-dock {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 105;
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: rgba(201, 162, 75, .4); border-top: 1px solid rgba(201, 162, 75, .45);
}
.dock-link {
  display: flex; align-items: center; justify-content: center;
  min-height: 52px; padding: 12px 8px;
  background: var(--ink-deep); color: var(--silver);
  font-size: 14px; font-weight: 700; letter-spacing: .1em;
}
.dock-link:hover { background: var(--ink-soft); color: var(--pearl); }
.dock-link--action { background: var(--orange); color: var(--ink-deep); }
.dock-link--action:hover { background: #F7A059; color: var(--ink-deep); }

.rail-progress { position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: rgba(196, 204, 217, .12); }
.rail-progress-fill {
  display: block; height: 100%; width: calc(var(--p, 0) * 100%);
  background: linear-gradient(90deg, var(--gold), var(--cyan));
  transition: width .15s linear;
}

html[data-nav-open] { overflow: hidden; }
@media (max-width: 979px) { body { padding-bottom: 60px; } }

/* ---------- 5. 按钮族 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: .72rem 1.15rem; border: 1px solid transparent; border-radius: var(--r);
  font-size: 14px; font-weight: 700; letter-spacing: .06em; line-height: 1.2;
  transition: transform .16s var(--ease), background-color .16s var(--ease), border-color .16s var(--ease), color .16s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn-gold { background: var(--gold); color: var(--ink-deep); }
.btn-gold:hover { background: var(--gold-soft); }
.btn-orange { background: var(--orange); color: var(--ink-deep); }
.btn-orange:hover { background: #F7A059; }
.btn-cyan { background: transparent; border-color: rgba(63, 208, 201, .6); color: var(--cyan); }
.btn-cyan:hover { background: rgba(63, 208, 201, .12); }
.btn-ghost { background: transparent; border-color: rgba(201, 162, 75, .5); color: var(--gold-soft); }
.btn-ghost:hover { border-color: var(--gold); background: rgba(201, 162, 75, .1); }
.btn-block { width: 100%; }

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative; margin-top: clamp(48px, 8vw, 96px);
  padding: clamp(40px, 6vw, 76px) 0 30px;
  background: linear-gradient(180deg, #0A1526, #081120);
  border-top: 1px solid var(--hair);
}
.site-footer::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--gold), rgba(201, 162, 75, .1) 46%, rgba(63, 208, 201, .55));
}
.footer-inner {
  width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter);
  display: grid; grid-template-columns: 1fr; gap: clamp(28px, 4vw, 52px);
}
.footer-brand-name { font-size: 1.3rem; font-weight: 800; letter-spacing: .06em; color: var(--pearl); }
.footer-brand-line { margin-top: 6px; font-size: 12.5px; letter-spacing: .16em; color: var(--gold-soft); }
.footer-service { margin-top: 16px; font-size: 14px; line-height: 1.7; color: var(--silver); }
.footer-contact { margin-top: 18px; display: grid; gap: 10px; }
.footer-contact li { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding-top: 10px; border-top: 1px dashed var(--hair-cool); font-size: 13.5px; }
.contact-label { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .16em; color: var(--gold); }
.contact-value { color: var(--pearl); font-size: 14px; }
.contact-value--mono { font-family: var(--font-mono); letter-spacing: .04em; }
.copy-btn {
  margin-left: auto; padding: 3px 10px;
  border: 1px solid rgba(63, 208, 201, .5); border-radius: 2px;
  font-size: 12px; font-weight: 700; letter-spacing: .08em; color: var(--cyan);
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}
.copy-btn:hover { background: rgba(63, 208, 201, .14); }
.copy-btn.is-done { border-color: var(--gold); color: var(--gold-soft); background: rgba(201, 162, 75, .14); }
.footer-note { margin-top: 14px; font-size: 12.5px; line-height: 1.7; color: rgba(196, 204, 217, .62); }

.footer-cols { display: grid; gap: clamp(20px, 3vw, 34px); grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
.footer-col-title {
  margin-bottom: 12px; padding-bottom: 10px;
  font-size: 12.5px; font-weight: 800; letter-spacing: .18em; color: var(--gold);
  border-bottom: 1px solid rgba(201, 162, 75, .3);
}
.footer-links { display: grid; gap: 8px; }
.footer-links a { font-size: 14px; color: var(--silver); transition: color .16s var(--ease); }
.footer-links a:hover { color: var(--gold-soft); }

.footer-bottom {
  grid-column: 1 / -1;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px;
  margin-top: clamp(24px, 4vw, 40px); padding-top: 18px;
  border-top: 1px solid var(--hair-cool);
  font-size: 12.5px; color: rgba(196, 204, 217, .72);
}
.footer-copy { max-width: none; }
.footer-legal { max-width: none; }
.footer-icp { font-family: var(--font-mono); letter-spacing: .06em; color: rgba(196, 204, 217, .86); }
.footer-top-btn { padding: .5rem .95rem; font-size: 12.5px; }

/* ---------- 7. 内容容器与页首 ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.wrap--narrow { max-width: 880px; }

.page-head { padding: clamp(30px, 6vw, 74px) 0 clamp(22px, 3vw, 40px); border-bottom: 1px solid var(--hair); }
.page-kicker { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .24em; color: var(--gold); }
.page-title { margin-top: 14px; }
.page-lede { margin-top: 18px; font-size: clamp(1rem, 1.3vw, 1.15rem); color: rgba(196, 204, 217, .9); }

.breadcrumbs { padding: 16px 0; font-size: 13px; color: rgba(196, 204, 217, .74); }
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumbs li { display: flex; align-items: center; gap: 8px; }
.breadcrumbs li + li::before { content: "/"; color: rgba(201, 162, 75, .6); }
.breadcrumbs a:hover { color: var(--gold-soft); }
.breadcrumbs [aria-current="page"] { color: var(--pearl); }

/* ---------- 8. 章节节奏 ---------- */
.section { padding-block: clamp(44px, 7vw, 92px); }
.section--tight { padding-block: clamp(28px, 4vw, 52px); }
.section-head { position: relative; padding-top: 18px; margin-bottom: clamp(20px, 3vw, 32px); display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px 16px; }
.section-head::before { content: ""; position: absolute; left: 0; top: 0; width: 54px; height: 3px; background: var(--gold); }
.section-num { font-family: var(--font-mono); font-size: 13px; letter-spacing: .2em; color: var(--gold); }
.section-title { font-size: clamp(1.4rem, 2.4vw, 2.05rem); }
.section-kicker { font-size: 13px; letter-spacing: .14em; color: rgba(196, 204, 217, .7); }

/* ---------- 9. 栅格 ---------- */
.sheet-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(18px, 2vw, 28px); }
.col-main { grid-column: span 12; }
.col-side { grid-column: span 12; }
.grid-auto { display: grid; gap: clamp(16px, 2vw, 26px); grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr)); }
.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }

/* ---------- 10. 卡片 / 标签 / 表格 / 数据块 ---------- */
.card {
  position: relative; padding: 22px;
  background: var(--paper); color: #2A2620;
  border: 1px solid rgba(28, 26, 23, .6); border-radius: var(--r);
  box-shadow: var(--shadow-stack);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease);
}
.card:hover { transform: translateY(-4px); border-color: rgba(28, 26, 23, .85); box-shadow: 0 1px 0 rgba(28, 26, 23, .55), 0 24px 42px -22px rgba(0, 0, 0, .85); }
.card h3, .card h2 { color: #1C1A17; }
.card p { color: #363128; }
.card--ink { background: linear-gradient(160deg, #12203C, #0B162A); color: var(--silver); border-color: rgba(201, 162, 75, .35); }
.card--ink h3, .card--ink h2 { color: var(--pearl); }
.card--ink p { color: var(--silver); }
.card-num { display: block; margin-bottom: 10px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .18em; color: var(--gold-deep); }
.card--ink .card-num { color: var(--gold); }

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 2px;
  font-size: 12px; font-weight: 700; letter-spacing: .06em;
  border: 1px solid rgba(196, 204, 217, .35); color: var(--silver); background: rgba(196, 204, 217, .06);
}
.tag--gold { border-color: rgba(201, 162, 75, .6); color: var(--gold-soft); background: rgba(201, 162, 75, .12); }
.tag--cyan { border-color: rgba(63, 208, 201, .6); color: var(--cyan); background: rgba(63, 208, 201, .12); }
.tag--orange { border-color: rgba(240, 138, 60, .6); color: var(--orange); background: rgba(240, 138, 60, .12); }
.tag--paper { border-color: rgba(28, 26, 23, .5); color: #3A342C; background: rgba(28, 26, 23, .07); }

.table-scroll { overflow-x: auto; border: 1px solid var(--hair); border-radius: var(--r); background: rgba(10, 21, 38, .6); }
.cmp-table { width: 100%; min-width: 520px; font-size: 15px; }
.cmp-table caption { padding: 12px 16px; text-align: left; font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .14em; color: var(--gold); }
.cmp-table th, .cmp-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--hair-cool); }
.cmp-table thead th { position: sticky; top: 0; background: var(--ink-deep); color: var(--gold-soft); font-size: 13px; font-weight: 800; letter-spacing: .1em; }
.cmp-table tbody th { font-weight: 700; color: var(--pearl); }
.cmp-table tbody tr:hover { background: rgba(63, 208, 201, .06); }

.num { font-family: var(--font-mono); font-size: 1.12em; letter-spacing: .02em; color: var(--gold-soft); }
.num--cyan { color: var(--cyan); }
.num--orange { color: var(--orange); }

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-value { font-family: var(--font-mono); font-size: clamp(1.9rem, 3.6vw, 2.9rem); line-height: 1; letter-spacing: .02em; color: var(--pearl); }
.stat-unit { font-size: 13px; letter-spacing: .12em; color: var(--cyan); }
.stat-label { font-size: 13px; color: rgba(196, 204, 217, .72); }

/* ---------- 11. 图片容器基础规则 ---------- */
figure { margin: 0; }
.media {
  position: relative; overflow: hidden; border-radius: var(--r);
  border: 1px solid rgba(201, 162, 75, .32);
  aspect-ratio: 16 / 9;
  background: linear-gradient(140deg, #12203C, #0A1526 62%, #16243D);
}
.media img { width: 100%; height: 100%; object-fit: cover; }
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media-caption { margin-top: 10px; font-size: 12.5px; letter-spacing: .04em; color: rgba(196, 204, 217, .7); }
.media-badge {
  position: absolute; left: 0; bottom: 0;
  padding: 6px 12px; background: var(--gold); color: var(--ink-deep);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em;
}

/* ---------- 12. 长文与旁注 ---------- */
.prose { max-width: 74ch; }
.prose > p + p { margin-top: 16px; }
.prose h2 { margin-top: 40px; }
.prose h3 { margin-top: 28px; }
.prose ul, .prose ol { margin-top: 16px; display: grid; gap: 8px; }
.prose li { position: relative; padding-left: 22px; }
.prose li::before { content: ""; position: absolute; left: 0; top: .78em; width: 12px; height: 2px; background: var(--gold); }
.note { padding-left: 14px; border-left: 2px solid var(--gold); font-size: 13.5px; color: rgba(196, 204, 217, .78); }

/* ---------- 13. 主题筛选 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px; }
.filter-btn {
  padding: .5rem .95rem; border-radius: 999px;
  border: 1px solid rgba(196, 204, 217, .28);
  font-size: 13.5px; font-weight: 700; letter-spacing: .06em; color: var(--silver);
  background: rgba(196, 204, 217, .05);
  transition: border-color .16s var(--ease), color .16s var(--ease), background-color .16s var(--ease);
}
.filter-btn:hover { border-color: rgba(63, 208, 201, .55); color: var(--pearl); }
.filter-btn[aria-pressed="true"] { border-color: var(--cyan); color: var(--cyan); background: rgba(63, 208, 201, .12); }
.filter-empty { padding: 18px 0; font-size: 14px; color: rgba(196, 204, 217, .7); }
.is-filtered { display: none !important; }

/* ---------- 14. 显现动效 ---------- */
.js [data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity .26s var(--ease), transform .26s var(--ease); }
.js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 15. 断点：平板 ---------- */
@media (min-width: 980px) {
  .brand-mark { width: 46px; height: 46px; font-size: 15px; }
  .brand-name { font-size: 17px; }
  .brand-tagline { display: block; }
  .footer-inner { grid-template-columns: minmax(260px, 1.15fr) 2fr; }
}

/* ---------- 16. 断点：桌面侧边轨道 ---------- */
@media (min-width: 980px) {
  body { padding-left: var(--rail-w); }

  .site-header {
    position: fixed; inset: 0 auto 0 0; width: var(--rail-w);
    flex-direction: column; align-items: stretch; justify-content: flex-start; gap: 0;
    padding: 26px 22px 22px;
    background: linear-gradient(180deg, #0A1526 0%, #0E1B33 52%, #0A1526 100%);
    border-bottom: 0; border-right: 1px solid rgba(201, 162, 75, .28);
    overflow-y: auto;
    -webkit-backdrop-filter: none; backdrop-filter: none;
  }
  .header-top { flex-direction: column; align-items: flex-start; justify-content: flex-start; gap: 18px; }
  .header-announce {
    display: flex; align-items: flex-start; gap: 8px;
    margin-top: 20px; padding: 10px 12px;
    font-size: 12.5px; line-height: 1.65; color: rgba(196, 204, 217, .86);
    background: rgba(63, 208, 201, .08);
    border-left: 2px solid var(--cyan);
  }
  .announce-dot { flex: 0 0 auto; width: 6px; height: 6px; margin-top: 8px; border-radius: 50%; background: var(--cyan); }
  .nav-toggle { display: none; }
  .nav-scrim { display: none; }
  .header-dock { display: none; }

  .site-nav {
    position: static; width: auto; transform: none; overflow: visible;
    flex: 1 1 auto; padding: 0; margin-top: 24px;
    background: none; border-right: 0; transition: none;
  }
  .nav-track > li { border-bottom: 0; border-top: 1px solid var(--hair-cool); }
  .nav-link { padding: 12px 2px; font-size: 14.5px; }
  .nav-foot { margin-top: auto; }
  .rail-progress { left: 0; right: auto; top: 0; bottom: 0; width: 2px; height: auto; }
  .rail-progress-fill { width: 100%; height: calc(var(--p, 0) * 100%); background: linear-gradient(180deg, var(--gold), var(--cyan)); transition: height .15s linear; }
  .sheet-grid { align-items: start; }
  .col-main { grid-column: span 8; }
  .col-side { grid-column: span 4; }
}

@media (min-width: 1280px) {
  .brand-mark { width: 50px; height: 50px; }
}

/* ---------- 17. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  html { scroll-behavior: auto; }
  .js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .btn:hover, .card:hover { transform: none; }
}