:root {
  --color-surface: #fbfbfb;
  --color-surface-alt: #f2f2f2;
  --color-surface-deep: #e5e6e7;
  --color-ink: #434a51;
  --color-ink-soft: #677079;
  --color-ink-muted: #767f89;
  --color-line: #dadbdc;
  --color-primary: #2c77c9;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dee9f4;
  --color-accent: #1a8289;
  --color-accent-ink: #ffffff;
  --color-highlight: #d2e5e6;
  --color-focus: #107c84;
  --color-contrast-surface: #0d1218;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #3c4046;
  --color-contrast-accent: #28cbd7;
  --overlay-scrim: linear-gradient(180deg, rgba(13, 18, 24, 0.35) 0%, rgba(13, 18, 24, 0.72) 55%, rgba(13, 18, 24, 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(38px, 7.8vw, 100px);
  --text-figure: clamp(32px, 5.6vw, 72px);
  --weight-heading: 782;
  --weight-body: 400;
  --leading-body: 1.65;
  --leading-heading: 1.29;
  --tracking-heading: 0.001em;
  --radius-sm: 1px;
  --radius-md: 1px;
  --radius-lg: 1px;
  --radius-pill: 1px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 6px;
  --space-2: 12px;
  --space-3: 18px;
  --space-4: 24px;
  --space-6: 36px;
  --space-8: 48px;
  --container: 1220px;
  --measure: 73ch;
  --gutter: 24px;
  --section-y: 74px;
  --section-y-lg: 104px;
}

/* =========================================================
   华体会娱乐 · 共享样式 /assets/site.css
   工程蓝图 × 赛场夜灯
   ========================================================= */

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  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);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

@media (min-width: 1024px) {
  body { padding-left: 84px; }
}

img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }

button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 180ms ease-out;
}
a:hover { text-decoration: underline; }

ul, ol { list-style: none; margin: 0; padding: 0; }

h1, h2, h3, h4, p, figure, blockquote, dl, dd, hr { margin: 0; }

hr { border: 0; }

::selection {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

/* ---------- 中文排版 ---------- */
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); }

strong, b { font-weight: var(--weight-heading); }
small { font-size: var(--text-sm); }

/* ---------- 通用工具 ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
}
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}
.unit {
  margin-left: 0.25em;
  font-size: 0.78em;
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.coord {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.coord--accent { color: var(--color-accent); }
.coord--oncontrast { color: var(--color-contrast-accent); }
.measure { max-width: var(--measure); }
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 容器与分节 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--section-y);
  border-top: 1px solid var(--color-line);
}
.section--lg { padding-block: var(--section-y-lg); }
.section--flush { border-top: 0; }
.section--alt { background-color: var(--color-surface-alt); }
.section--deep { background-color: var(--color-surface-deep); }

.section--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top-color: var(--color-contrast-line);
}
.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4 { color: var(--color-contrast-ink); }
.section--contrast p,
.section--contrast li,
.section--contrast dd {
  color: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent);
}
.section--contrast a { color: var(--color-contrast-accent); }
.section--contrast .coord {
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.section--contrast .coord--accent { color: var(--color-contrast-accent); }
.section--contrast .rule-double {
  border-top-color: var(--color-contrast-line);
  border-bottom-color: var(--color-contrast-line);
}
.section--contrast .rule-dotted { border-top-color: var(--color-contrast-line); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-6);
  border-bottom: 1px dotted var(--color-line);
}
.section--contrast .section-head { border-bottom-color: var(--color-contrast-line); }

.rule-double {
  height: 6px;
  border-top: 1px solid var(--color-line);
  border-bottom: 3px solid var(--color-line);
}
.rule-dotted { border-top: 1px dotted var(--color-line); }

/* ---------- 蓝图网格 ---------- */
.blueprint-grid {
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--color-line) 62%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--color-line) 62%, transparent) 1px, transparent 1px);
  background-size: var(--gutter) var(--gutter);
}
.blueprint-dots {
  background-image:
    radial-gradient(circle at 1px 1px, color-mix(in srgb, var(--color-line) 92%, transparent) 1px, transparent 1.5px);
  background-size: var(--gutter) var(--gutter);
}
.section--contrast.blueprint-grid,
.blueprint-grid--contrast {
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--color-contrast-line) 80%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--color-contrast-line) 80%, transparent) 1px, transparent 1px);
}
.blueprint-dots--contrast {
  background-image:
    radial-gradient(circle at 1px 1px, color-mix(in srgb, var(--color-contrast-line) 95%, transparent) 1px, transparent 1.5px);
  background-size: var(--gutter) var(--gutter);
}

/* ---------- 栅格 ---------- */
.grid { display: grid; gap: var(--gutter); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.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; }

.split {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--space-8);
}
.split--reverse { grid-template-columns: 5fr 7fr; }
.split--even { grid-template-columns: 6fr 6fr; }

.edge-slant {
  clip-path: polygon(0 0, 100% 0, calc(100% - 36px) 100%, 0 100%);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 11px 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1;
  letter-spacing: 0.04em;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 180ms ease-out, color 180ms ease-out, border-color 180ms ease-out;
}
.btn:hover { text-decoration: none; }
.btn-solid {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn-solid:hover {
  background-color: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface));
  border-color: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
}
.btn-accent {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn-accent:hover {
  background-color: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface));
  border-color: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface));
  color: var(--color-accent-ink);
}
.btn-ghost {
  background-color: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}
.btn-ghost:hover {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ---------- 小标签 ---------- */
.chip-no {
  display: inline-block;
  padding: 3px 8px;
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  border: 1px solid color-mix(in srgb, var(--color-primary) 30%, transparent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  line-height: 1.5;
}
.invert-chip {
  display: inline-block;
  padding: 3px 8px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
  border: 1px solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  line-height: 1.5;
}
.invert-chip--accent {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.section--contrast .invert-chip {
  background-color: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 10px 16px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
}
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-2);
  text-decoration: none;
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: 12px var(--gutter);
  min-height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-ink);
  text-decoration: none;
}
.brand:hover { text-decoration: none; color: var(--color-ink); }
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}
.brand-text { display: flex; flex-direction: column; gap: 1px; }
.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  letter-spacing: var(--tracking-heading);
}
.brand-domain {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: transparent;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background-color 180ms ease-out, color 180ms ease-out, border-color 180ms ease-out;
}
.nav-toggle:hover {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.nav-toggle[aria-expanded="true"] {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
}
.nav-toggle-bars {
  position: relative;
  display: block;
  width: 15px;
  height: 9px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: currentColor;
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle-label { display: inline-block; }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  z-index: 2;
}

/* ---------- 侧边轨道导航 ---------- */
.rail-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 45;
  width: 84px;
  display: flex;
  flex-direction: column;
  padding: var(--space-4) 0 var(--space-3);
  background-color: var(--color-contrast-surface);
  border-right: 1px solid var(--color-contrast-line);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.rail-label {
  padding: 0 6px var(--space-3);
  margin: 0;
  max-width: none;
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
  border-bottom: 1px solid var(--color-contrast-line);
}
.rail-list { display: flex; flex-direction: column; }
.rail-list li { border-bottom: 1px solid var(--color-contrast-line); }
.rail-list a {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 11px 8px 11px 12px;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.25;
  text-decoration: none;
  transition: background-color 180ms ease-out, color 180ms ease-out;
}
.rail-list a:hover {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 14%, transparent);
  color: var(--color-contrast-ink);
  text-decoration: none;
}
.rail-list a[aria-current="page"] {
  background-color: color-mix(in srgb, var(--color-primary) 28%, var(--color-contrast-surface));
  color: var(--color-contrast-ink);
}
.rail-list a[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--color-primary);
}
.rail-list a[aria-current="page"] .rail-num { color: var(--color-contrast-accent); }
.rail-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, var(--color-contrast-surface));
}
.rail-text { display: block; letter-spacing: 0.02em; }

.rail-foot {
  margin-top: auto;
  padding: var(--space-3) 8px 0;
  border-top: 1px solid var(--color-contrast-line);
  text-align: center;
  font-family: var(--font-mono);
}
.rail-foot-label {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
}
.rail-foot-value {
  display: block;
  margin-top: 2px;
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, var(--color-contrast-surface));
}

@media (min-width: 1024px) {
  .nav-toggle { display: none; }
}

@media (max-width: 1023px) {
  .rail-nav {
    width: min(300px, 84vw);
    z-index: 45;
    padding-top: 76px;
    transform: translateX(-102%);
    visibility: hidden;
    transition: transform 180ms ease-out, visibility 0ms linear 180ms;
  }
  .rail-nav[data-open="true"] {
    transform: translateX(0);
    visibility: visible;
    transition: transform 180ms ease-out, visibility 0ms linear 0ms;
  }
  .rail-list a { padding: 14px 12px 14px 16px; font-size: var(--text-base); }
  .rail-foot { padding-bottom: var(--space-3); }
}

@media (max-width: 719px) {
  .header-cta--optional { display: none; }
  .site-header .btn { padding: 9px 12px; font-size: var(--text-xs); }
}

/* ---------- 页脚 ---------- */
.site-footer { background-color: var(--color-surface); }

.footer-top {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: 3px solid var(--color-contrast-line);
}
.footer-top-inner {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  gap: var(--space-8);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--section-y) var(--gutter);
}
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.footer-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-contrast-line);
  color: var(--color-contrast-accent);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
}
.footer-name {
  max-width: none;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  color: var(--color-contrast-ink);
}
.footer-domain {
  max-width: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}
.footer-line {
  max-width: 34ch;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}
.footer-index {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}
.footer-col { min-width: 0; }
.footer-col-title {
  max-width: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-contrast-accent);
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: var(--space-3);
}
.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: 1px dotted transparent;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}
.footer-links a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
  text-decoration: none;
}

.footer-bottom {
  background-color: var(--color-surface-alt);
  border-top: 1px solid var(--color-line);
}
.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3) var(--space-6);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-6) var(--gutter);
}
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px var(--space-4);
  max-width: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  color: var(--color-ink-muted);
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-sm);
}
.footer-legal a { color: var(--color-ink-soft); }
.footer-legal a:hover { color: var(--color-primary); }

@media (max-width: 1023px) {
  .footer-top-inner { grid-template-columns: 1fr; gap: var(--space-6); }
}
@media (max-width: 639px) {
  .footer-index { grid-template-columns: 1fr; gap: var(--space-4); }
  .footer-bottom-inner { flex-direction: column; align-items: flex-start; }
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before {
  content: "/";
  color: color-mix(in srgb, var(--color-ink-muted) 55%, transparent);
}
.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb [aria-current="page"] { color: var(--color-primary); }

/* ---------- 图片容器 ---------- */
.figure-frame {
  position: relative;
  margin: 0;
  padding: var(--space-1);
  border: 1px solid var(--color-line);
  background-color: var(--color-surface-deep);
}
.figure-frame img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border: 1px solid var(--color-line);
  filter: contrast(1.04) saturate(1.02);
}
.figure-frame--wide img { aspect-ratio: 21 / 9; }
.figure-frame--tall img { aspect-ratio: 4 / 5; }
.figure-frame figcaption {
  position: absolute;
  left: var(--space-1);
  right: var(--space-1);
  bottom: var(--space-1);
  padding: 10px 12px;
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  line-height: 1.5;
}
.figure-cap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* ---------- 纵向时间轴 ---------- */
.timeline {
  position: relative;
  padding-left: var(--space-6);
}
.timeline::before {
  content: "";
  position: absolute;
  left: var(--space-2);
  top: 6px;
  bottom: 6px;
  border-left: 1px dotted var(--color-line);
}
.section--contrast .timeline::before { border-left-color: var(--color-contrast-line); }
.timeline-item {
  position: relative;
  padding-bottom: var(--space-6);
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(var(--space-2) - var(--space-6) - 3px);
  top: 6px;
  width: 7px;
  height: 7px;
  background-color: var(--color-accent);
  border-radius: var(--radius-pill);
}
.section--contrast .timeline-item::before { background-color: var(--color-contrast-accent); }
.timeline-time {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-accent);
}
.section--contrast .timeline-time { color: var(--color-contrast-accent); }

/* ---------- 分段切换 ---------- */
.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--color-line);
}
.tab {
  appearance: none;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-bottom: 0;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background-color: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 180ms ease-out, color 180ms ease-out, border-color 180ms ease-out;
}
.tab:hover {
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
}
.tab[aria-selected="true"] {
  background-color: var(--color-primary-soft);
  border-color: var(--color-line);
  color: var(--color-primary);
}
.tab-panel { padding-top: var(--space-6); }
.tab-panel[hidden] { display: none; }

/* ---------- 入场点亮 ---------- */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 180ms ease-out, transform 180ms ease-out;
}
html.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 焦点 ---------- */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}
.section--contrast :focus-visible,
.rail-nav :focus-visible,
.footer-top :focus-visible,
.skip-link:focus-visible {
  outline-color: var(--color-contrast-accent);
}

/* ---------- 响应式栅格 ---------- */
@media (max-width: 1023px) {
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-7, .col-8, .col-9, .col-12 { grid-column: span 6; }
  .col-3, .col-4, .col-5 { grid-column: span 3; }
  .split, .split--reverse, .split--even {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}
@media (max-width: 639px) {
  .grid--12 { grid-template-columns: 1fr; }
  .col-3, .col-4, .col-5, .col-6,
  .col-7, .col-8, .col-9, .col-12 { grid-column: span 1; }
  .edge-slant { clip-path: none; }
  .timeline { padding-left: var(--space-4); }
  .timeline::before { left: 7px; }
  .timeline-item::before { left: calc(7px - var(--space-4)); }
}

/* ---------- 动效偏好 ---------- */
@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.has-js [data-reveal] { opacity: 1; transform: none; }
  .rail-nav { transition: none; }
}