:root {
  --color-surface: #f9f9f9;
  --color-surface-alt: #f0f0f0;
  --color-surface-deep: #e3e4e5;
  --color-ink: #404a4f;
  --color-ink-soft: #616e75;
  --color-ink-muted: #75838a;
  --color-line: #d8dada;
  --color-primary: #267cab;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dbe8ee;
  --color-accent: #118267;
  --color-accent-ink: #ffffff;
  --color-highlight: #cfe4df;
  --color-focus: #098063;
  --color-contrast-surface: #152026;
  --color-contrast-ink: #e4e6e7;
  --color-contrast-line: #434c50;
  --color-contrast-accent: #1ee1b1;
  --overlay-scrim: linear-gradient(180deg, rgba(21, 32, 38, 0.35) 0%, rgba(21, 32, 38, 0.72) 55%, rgba(21, 32, 38, 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: 12.2px;
  --text-sm: 15.2px;
  --text-base: 17px;
  --text-lg: 21.2px;
  --text-xl: 26.6px;
  --text-2xl: 33.2px;
  --text-3xl: 41.5px;
  --text-4xl: 51.9px;
  --text-display: clamp(49px, 10.2vw, 130px);
  --text-figure: clamp(41px, 7.3vw, 94px);
  --weight-heading: 639;
  --weight-body: 400;
  --leading-body: 1.79;
  --leading-heading: 1.22;
  --tracking-heading: -0.003em;
  --radius-sm: 14px;
  --radius-md: 16px;
  --radius-lg: 19px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(64, 74, 79, 0.08);
  --shadow-2: 0 18px 44px rgba(64, 74, 79, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1280px;
  --measure: 66ch;
  --gutter: 24px;
  --section-y: 83px;
  --section-y-lg: 116px;
}

/* ---------- 派生令牌 ---------- */
:root {
  --rail-w: calc(var(--space-8) * 2 + var(--space-4));
  --bar-h: var(--space-6);
  --glass-bg: color-mix(in srgb, var(--color-surface) 82%, transparent);
  --glass-bg-strong: color-mix(in srgb, var(--color-surface) 93%, transparent);
  --glass-edge: color-mix(in srgb, var(--color-surface) 88%, var(--color-primary-soft));
  --glass-tint: color-mix(in srgb, var(--color-primary-soft) 62%, transparent);
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-4);
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background-color: var(--color-surface);
  background-image:
    radial-gradient(58% 46% at 88% -6%, color-mix(in srgb, var(--color-primary) 24%, transparent), transparent 72%),
    radial-gradient(44% 40% at 2% 10%, color-mix(in srgb, var(--color-accent) 15%, transparent), transparent 74%),
    radial-gradient(72% 58% at 100% 104%, color-mix(in srgb, var(--color-primary-soft) 78%, transparent), transparent 70%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

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

ul,
ol { margin: 0; padding: 0; }

a { color: var(--color-primary); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--color-accent); }

button { font: inherit; }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ---------- 中文排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}

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 { margin: 0 0 var(--space-2); }

p:last-child { margin-bottom: 0; }

.num,
[data-num] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

::selection {
  background-color: color-mix(in srgb, var(--color-highlight) 90%, transparent);
  color: var(--color-ink);
}

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

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }

.section--skew {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  clip-path: polygon(0 3.2%, 100% 0, 100% 96.8%, 0 100%);
  padding-block: calc(var(--section-y) + var(--space-6));
}

.section--skew h2,
.section--skew h3,
.section--skew h4 { color: var(--color-contrast-ink); }

.section--skew p { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }

.rule-dashed {
  border: 0;
  border-top: var(--border-thin) dashed var(--color-line);
  margin-block: var(--space-4);
}

.section--skew .rule-dashed { border-top-color: var(--color-contrast-line); }

/* ---------- 标题语言 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
}

.section--skew .eyebrow { color: var(--color-contrast-accent); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-4);
  border-bottom: var(--border-thin) dashed var(--color-line);
}

.section--skew .section-head { border-bottom-color: var(--color-contrast-line); }

.section-head__title {
  margin: 0;
  font-size: var(--text-2xl);
}

.section-head__note {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.section--skew .section-head__note { color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent); }

.lede {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.55;
  color: var(--color-ink-soft);
}

/* ---------- 玻璃层叠 ---------- */
.glass-panel {
  position: relative;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--glass-edge);
  border-radius: var(--radius-lg);
  background-color: var(--glass-bg);
  background-image: linear-gradient(180deg, color-mix(in srgb, var(--color-surface) 70%, transparent), color-mix(in srgb, var(--color-primary-soft) 24%, transparent));
  -webkit-backdrop-filter: blur(14px) saturate(1.18);
  backdrop-filter: blur(14px) saturate(1.18);
  box-shadow: var(--shadow-1);
}

.glass-panel--strong {
  background-color: var(--glass-bg-strong);
  box-shadow: var(--shadow-2);
}

.glass-panel + .glass-panel { margin-top: var(--space-2); }

.colorbed {
  position: relative;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background-image: linear-gradient(135deg, var(--color-primary) 0%, color-mix(in srgb, var(--color-accent) 68%, var(--color-primary)) 100%);
  color: var(--color-primary-ink);
  overflow: hidden;
}

.colorbed--soft {
  background-image: linear-gradient(135deg, var(--color-primary-soft) 0%, color-mix(in srgb, var(--color-highlight) 84%, var(--color-surface)) 100%);
  color: var(--color-ink);
}

.colorbed--dark {
  background-image: none;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.colorbed--dark h2,
.colorbed--dark h3,
.colorbed--dark h4 { color: var(--color-contrast-ink); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: calc(var(--space-4) + var(--space-1));
  padding: 10px var(--space-3);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  text-decoration: none;
  cursor: pointer;
  transition: transform 140ms ease, background-color 140ms ease, color 140ms ease, border-color 140ms ease;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

.btn--primary:hover { background-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);
  color: var(--color-accent-ink);
}

.btn--accent:hover { background-color: color-mix(in srgb, var(--color-accent) 82%, var(--color-contrast-surface)); color: var(--color-accent-ink); }

.btn--ghost {
  background-color: color-mix(in srgb, var(--color-surface) 62%, transparent);
  border-color: var(--color-line);
  color: var(--color-ink);
}

.btn--ghost:hover { background-color: var(--color-highlight); color: var(--color-ink); }

.btn:hover { transform: translateY(-1px); }

.section--skew .btn--ghost,
.colorbed--dark .btn--ghost {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 10%, transparent);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  padding-block: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.breadcrumbs__list li {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.breadcrumbs__list li + li::before {
  content: "/";
  color: var(--color-line);
}

.breadcrumbs a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) dashed var(--color-line);
}

.breadcrumbs a:hover { color: var(--color-accent); }

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: var(--gutter);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-primary-soft) 58%, transparent);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-ink-soft);
  white-space: nowrap;
}

.tag--accent {
  border-color: color-mix(in srgb, var(--color-accent) 42%, transparent);
  background-color: color-mix(in srgb, var(--color-highlight) 82%, transparent);
  color: var(--color-accent);
}

/* ---------- 数据卡 ---------- */
.stat-card {
  display: grid;
  gap: 4px;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--glass-edge);
  border-radius: var(--radius-md);
  background-color: var(--glass-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-1);
}

.stat-card__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--color-accent);
}

.stat-card__label {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.stat-card--hero .stat-card__value { font-size: var(--text-figure); }

.colorbed--dark .stat-card {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent);
  border-color: var(--color-contrast-line);
}

.colorbed--dark .stat-card__value { color: var(--color-contrast-accent); }
.colorbed--dark .stat-card__label { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

/* ---------- 展签式图片容器 ---------- */
.figure-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: var(--ratio, 16 / 9);
  border: var(--border-thin) solid var(--glass-edge);
  border-radius: var(--radius-lg);
  background-color: var(--color-contrast-surface);
  box-shadow: var(--shadow-1);
}

.figure-frame[data-ratio="wide"] { --ratio: 21 / 9; }
.figure-frame[data-ratio="tall"] { --ratio: 3 / 4; }
.figure-frame[data-ratio="square"] { --ratio: 1 / 1; }

.figure-frame__media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background-image: linear-gradient(140deg, var(--color-primary) 0%, color-mix(in srgb, var(--color-accent) 52%, var(--color-contrast-surface)) 100%);
}

.figure-frame__scrim {
  position: absolute;
  inset: 0;
  background-image: var(--overlay-scrim);
  pointer-events: none;
}

.figure-frame__tag {
  position: absolute;
  left: var(--space-2);
  bottom: var(--space-2);
  z-index: 2;
  max-width: calc(100% - var(--space-4));
  padding: 5px var(--space-2);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-contrast-accent) 46%, transparent);
  border-radius: var(--radius-sm);
  background-color: color-mix(in srgb, var(--color-contrast-surface) 82%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.4;
  color: var(--color-contrast-accent);
}

.figure-frame__caption {
  position: absolute;
  right: var(--space-2);
  top: var(--space-2);
  z-index: 2;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-contrast-surface) 76%, transparent);
  font-size: var(--text-xs);
  color: var(--color-contrast-ink);
}

/* ---------- 分段切换 ---------- */
.tabs { display: grid; gap: var(--space-3); }

.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding: 6px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-surface-alt) 86%, transparent);
}

.tab-btn {
  appearance: none;
  padding: 8px var(--space-2);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  background: none;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: background-color 140ms ease, color 140ms ease, border-color 140ms ease;
}

.tab-btn:hover { background-color: var(--color-highlight); color: var(--color-ink); }

.tab-btn[aria-selected="true"] {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  box-shadow: var(--shadow-1);
}

.tab-panel {
  padding-top: var(--space-3);
  border-top: var(--border-thin) dashed var(--color-line);
}

.tab-panel[hidden] { display: none; }

/* ---------- 显现 ---------- */
[data-js="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 240ms ease, transform 240ms ease;
}

[data-js="on"] [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* ============================================================
   页头
   ============================================================ */
.skip-link {
  position: fixed;
  top: var(--space-1);
  left: var(--space-1);
  z-index: 200;
  padding: 10px var(--space-2);
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
  font-size: var(--text-sm);
  text-decoration: none;
  transform: translateY(-260%);
  transition: transform 140ms ease;
}

.skip-link:focus { transform: translateY(0); color: var(--color-contrast-accent); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
}

/* 赛事状态条 */
.status-strip {
  order: 2;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 6px var(--gutter);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.status-strip__pulse {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background-color: var(--color-contrast-accent);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--color-contrast-accent) 60%, transparent);
  animation: statusPulse 2000ms ease-out 3;
}

@keyframes statusPulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--color-contrast-accent) 62%, transparent); }
  70% { box-shadow: 0 0 0 8px color-mix(in srgb, var(--color-contrast-accent) 0%, transparent); }
  100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--color-contrast-accent) 0%, transparent); }
}

.status-strip__label { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }

.status-strip__value {
  color: var(--color-contrast-accent);
  font-weight: 600;
}

.status-strip__meta {
  margin-left: auto;
  display: none;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

.status-strip__badge {
  padding: 1px 8px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  color: var(--color-contrast-ink);
}

/* 品牌条 / 侧轨 */
.site-header__rail {
  order: 1;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--gutter);
  background-color: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
  box-shadow: var(--shadow-1);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
  color: var(--color-ink);
}

.brand__mark {
  width: calc(var(--space-4) + var(--space-1));
  height: calc(var(--space-4) + var(--space-1));
  flex: none;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background-image: linear-gradient(140deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  box-shadow: var(--shadow-1);
}

.brand__text { display: flex; flex-direction: column; gap: 2px; line-height: 1.1; }

.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.brand__tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

/* 移动导航按钮 */
.nav-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 9px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-surface-alt) 80%, transparent);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  cursor: pointer;
}

.nav-toggle:hover { background-color: var(--color-highlight); }

.nav-toggle__icon {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__icon i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform 160ms ease, opacity 160ms ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 导航（移动端抽屉） */
.site-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 120;
  width: min(86vw, 344px);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: calc(var(--space-8) + var(--space-2)) var(--space-3) var(--space-4);
  overflow-y: auto;
  background-color: var(--glass-bg-strong);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  backdrop-filter: blur(20px) saturate(1.2);
  border-left: var(--border-thin) solid var(--color-line);
  box-shadow: var(--shadow-2);
  transform: translateX(103%);
  transition: transform 220ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.site-nav[data-open] { transform: translateX(0); }

.site-nav__list {
  list-style: none;
  display: grid;
  gap: 0;
}

.site-nav__list > li + li { border-top: var(--border-thin) dashed var(--color-line); }

.site-nav__link {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  transition: background-color 140ms ease, color 140ms ease;
}

.site-nav__link:hover {
  background-color: color-mix(in srgb, var(--color-highlight) 72%, transparent);
  color: var(--color-ink);
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-ink-muted);
}

.site-nav__label { overflow-wrap: anywhere; }

.site-nav__link[aria-current="page"] {
  background-color: color-mix(in srgb, var(--color-primary-soft) 66%, transparent);
  border-color: color-mix(in srgb, var(--color-accent) 42%, transparent);
  color: var(--color-accent);
}

.site-nav__link[aria-current="page"] .site-nav__index { color: var(--color-accent); }

.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 50%;
  width: 3px;
  height: 58%;
  transform: translateY(-50%);
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
}

.site-nav__note {
  margin: auto 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thin) dashed var(--color-line);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* 抽屉遮罩 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 110;
  border: 0;
  background-color: color-mix(in srgb, var(--color-contrast-surface) 56%, transparent);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}

.nav-scrim[hidden] { display: none; }

/* 滚动进度 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 130;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 55%, var(--color-contrast-accent) 100%);
}

/* ============================================================
   桌面端：左侧数据轨 + 顶部状态条
   ============================================================ */
@media (min-width: 1024px) {
  body {
    padding-left: var(--rail-w);
    padding-top: var(--bar-h);
  }

  html { scroll-padding-top: calc(var(--bar-h) + var(--space-3)); }

  .site-header {
    display: block;
    position: static;
  }

  .status-strip {
    position: fixed;
    top: 0;
    left: var(--rail-w);
    right: 0;
    z-index: 75;
    height: var(--bar-h);
    order: 0;
    padding-inline: var(--gutter);
    border-bottom: var(--border-thin) dashed var(--color-contrast-line);
    transition: height 180ms ease;
  }

  .status-strip[data-compact="true"] { height: var(--space-4); }

  .status-strip__meta { display: inline; }

  .site-header__rail {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 90;
    width: var(--rail-w);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-2) var(--space-3);
    overflow-y: auto;
    border-bottom: 0;
    border-right: var(--border-thin) solid var(--color-line);
    background-color: var(--glass-bg);
    -webkit-backdrop-filter: blur(18px) saturate(1.25);
    backdrop-filter: blur(18px) saturate(1.25);
    box-shadow: none;
  }

  .brand { flex-direction: column; align-items: flex-start; gap: var(--space-2); }

  .brand__text { gap: 4px; }

  .brand__name { font-size: var(--text-xl); }

  .brand__tag { white-space: normal; }

  .nav-toggle { display: none; }

  /* 导航回归轨道内的纵向列表 */
  .site-nav {
    position: static;
    width: 100%;
    transform: none;
    transition: none;
    flex-direction: column;
    overflow: visible;
    padding: 0;
    background: none;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    border: 0;
    box-shadow: none;
  }

  .site-nav__list > li + li { border-top: var(--border-thin) dashed var(--color-line); }

  .site-nav__link {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
    padding: var(--space-2) var(--space-1) var(--space-2) var(--space-2);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
  }

  .site-nav__link[aria-current="page"]::before { left: 3px; }

  .site-nav__note { font-size: var(--text-xs); }

  .nav-scrim { display: none !important; }
}

@media (min-width: 1280px) {
  .status-strip__meta { letter-spacing: 0.06em; }
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: var(--section-y-lg);
  padding-block: var(--section-y) var(--space-3);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  overflow: hidden;
}

.site-footer__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(48% 58% at 10% 0%, color-mix(in srgb, var(--color-contrast-accent) 15%, transparent), transparent 72%),
    radial-gradient(46% 64% at 94% 8%, color-mix(in srgb, var(--color-primary) 42%, transparent), transparent 74%);
}

.site-footer > .container { position: relative; }

.site-footer__brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.footer-mark {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.footer-mark__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4) var(--gutter);
}

.footer-col {
  padding-top: var(--space-2);
  border-top: var(--border-thin) dashed var(--color-contrast-line);
}

.footer-col__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
}

.footer-col__list {
  list-style: none;
  display: grid;
  gap: 6px;
}

.footer-col__list a {
  display: inline-block;
  padding-block: 2px;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) dashed transparent;
  transition: color 140ms ease, border-color 140ms ease;
}

.footer-col__list a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: color-mix(in srgb, var(--color-contrast-accent) 62%, transparent);
}

.footer-col__note {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  line-height: 1.62;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

.footer-contact__line {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-ink);
  overflow-wrap: anywhere;
}

.footer-col--contact .footer-col__note { margin-top: var(--space-2); }

.site-footer__bottom {
  position: relative;
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.site-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-1) var(--space-4);
}

.footer-legal {
  margin: 0;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
  overflow-wrap: anywhere;
}

/* 返回顶部 */
.to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 100;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px var(--space-2);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-contrast-accent) 46%, transparent);
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-contrast-surface) 92%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: var(--color-contrast-accent);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  cursor: pointer;
  box-shadow: var(--shadow-2);
}

.to-top:hover { background-color: color-mix(in srgb, var(--color-contrast-accent) 18%, var(--color-contrast-surface)); }

.to-top[hidden] { display: none; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1023px) {
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 719px) {
  :root { --section-y: 56px; --section-y-lg: 72px; }

  body { font-size: var(--text-base); line-height: 1.7; }

  h1 { font-size: var(--text-2xl); }
  h2 { font-size: var(--text-xl); }
  h3 { font-size: var(--text-lg); }

  .lede { font-size: var(--text-base); }

  .site-footer__grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-3); }
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .figure-frame { --ratio: 4 / 3; }
  .figure-frame[data-ratio="tall"] { --ratio: 3 / 4; }

  .section--skew {
    clip-path: polygon(0 2%, 100% 0, 100% 98%, 0 100%);
    padding-block: calc(var(--section-y) + var(--space-3));
  }

  .brand__tag { font-size: var(--text-xs); }
  .to-top { right: var(--space-2); bottom: var(--space-2); }
}

/* ============================================================
   可访问性
   ============================================================ */
@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;
  }

  [data-js="on"] [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .status-strip__pulse { animation: none; box-shadow: none; }
}

#main-content { scroll-margin-top: var(--space-4); }

@media (min-width: 1024px) {
  #main-content { scroll-margin-top: calc(var(--bar-h) + var(--space-2)); }
}