/* ============ 0. 设计定稿变量（原样保留） ============ */
:root {
  --color-surface: #f2f4f3;
  --color-surface-alt: #e9ebea;
  --color-surface-deep: #dcdfde;
  --color-ink: #3b4945;
  --color-ink-soft: #5a6d67;
  --color-ink-muted: #748b84;
  --color-line: #d1d5d4;
  --color-primary: #3a836c;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #d8e4e0;
  --color-accent: #b55d4a;
  --color-accent-ink: #ffffff;
  --color-highlight: #e7d9d5;
  --color-focus: #b24e38;
  --color-contrast-surface: #101715;
  --color-contrast-ink: #e4e7e6;
  --color-contrast-line: #3f4543;
  --color-contrast-accent: #bb6a58;
  --overlay-scrim: linear-gradient(180deg, rgba(16, 23, 21, 0.35) 0%, rgba(16, 23, 21, 0.72) 55%, rgba(16, 23, 21, 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(37px, 7.7vw, 98px);
  --text-figure: clamp(31px, 5.5vw, 71px);
  --weight-heading: 645;
  --weight-body: 400;
  --leading-body: 1.84;
  --leading-heading: 1.17;
  --tracking-heading: 0.006em;
  --radius-sm: 3px;
  --radius-md: 4px;
  --radius-lg: 4px;
  --radius-pill: 4px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 1px 0 rgba(59, 73, 69, 0.12);
  --shadow-2: 0 2px 0 rgba(59, 73, 69, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1040px;
  --measure: 73ch;
  --gutter: 24px;
  --section-y: 94px;
  --section-y-lg: 132px;
}

/* ============ 1. Reset ============ */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: 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);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5, h6 { font-size: var(--text-base); }

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

a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-accent); }

ul, ol { margin: 0 0 var(--space-2); padding-left: 1.25em; }
li { margin: 0.15em 0; }

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

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

table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; }

[hidden] { display: none !important; }

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

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

/* ============ 2. 布局基础 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--wide { max-width: calc(var(--container) + 160px); }

.measure { max-width: var(--measure); }

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

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

.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-12 { grid-column: span 12; }

.stack > * + * { margin-top: var(--space-3); }

/* ============ 3. 文字体系 ============ */
.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: -0.012em;
  margin: 0;
}

.figure-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
}

.h-section { font-size: var(--text-2xl); }

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.eyebrow::before {
  content: "";
  display: block;
  width: 24px;
  height: var(--border-thick);
  background: var(--color-accent);
}

.vlabel {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.28em;
  color: var(--color-ink-muted);
}

.text-mono { font-family: var(--font-mono); }
.text-soft { color: var(--color-ink-soft); }
.text-muted { color: var(--color-ink-muted); }

/* ============ 4. 分节与区块头 ============ */
.section-head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding-top: var(--space-2);
  margin-bottom: var(--space-4);
  border-top: var(--border-thick) solid var(--color-line);
}

.section-head__num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.section-head__body { flex: 1 1 auto; min-width: 0; }

.section-head__title {
  margin: 0 0 var(--space-1);
  font-size: var(--text-xl);
}

.section-head__desc {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.divider {
  height: 6px;
  border-top: var(--border-thick) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
  margin: var(--space-6) 0;
}

.divider--accent { border-top-color: var(--color-accent); }

/* ============ 5. 徽标 / 按钮 / 筛选 ============ */
.mark {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  line-height: 1.4;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
}

.mark--mono { font-family: var(--font-mono); letter-spacing: 0.12em; }

.mark--primary {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 38%, transparent);
  color: var(--color-primary);
}

.mark--accent {
  background: color-mix(in srgb, var(--color-accent) 14%, var(--color-surface));
  border-color: color-mix(in srgb, var(--color-accent) 42%, transparent);
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.mark--ghost {
  background: transparent;
  border-color: var(--color-line);
  color: var(--color-ink-muted);
}

.mark--contrast {
  background: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 10px 18px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn:hover {
  background: color-mix(in srgb, var(--color-primary) 84%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
}

.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover {
  background: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface));
  color: var(--color-accent-ink);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}

.btn--ghost:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--block { width: 100%; }

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.chip {
  padding: 5px 10px;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.chip:hover { border-color: var(--color-primary); color: var(--color-primary); }

.chip[aria-pressed="true"],
.chip[aria-selected="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

/* ============ 6. 数据组件 ============ */
.data-table {
  width: 100%;
  font-size: var(--text-sm);
  border-top: var(--border-thick) solid var(--color-line);
}

.data-table th {
  padding: 10px var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  background: var(--color-primary-soft);
  color: var(--color-ink);
  border-bottom: var(--border-thick) solid var(--color-primary);
}

.data-table td {
  padding: 10px var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  vertical-align: baseline;
}

.data-table tbody tr:nth-child(even) { background: var(--color-surface-alt); }
.data-table .num { font-family: var(--font-mono); text-align: right; }
.data-table .rank { font-family: var(--font-mono); color: var(--color-accent); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0 0 var(--space-3);
  padding: var(--space-2) 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
}

.legend__swatch {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--color-primary);
}

.legend__swatch--accent { background: var(--color-accent); }
.legend__swatch--deep { background: var(--color-contrast-surface); }
.legend__swatch--pale { background: var(--color-primary-soft); }

.toc {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: var(--border-thick) solid var(--color-line);
}

.toc a {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  margin-left: calc(var(--border-thick) * -1);
  padding: 6px var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-left: var(--border-thick) solid transparent;
}

.toc a:hover { color: var(--color-primary); }

.toc a[aria-current="true"] {
  color: var(--color-primary);
  border-left-color: var(--color-accent);
  background: var(--color-primary-soft);
}

.card {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.card--deep {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.card--deep a { color: var(--color-contrast-accent); }

/* ============ 7. 球场网格与图片容器 ============ */
.pitch-grid { position: relative; }

.pitch-grid::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--color-line) 72%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--color-line) 72%, transparent) 1px, transparent 1px);
  background-size: var(--space-6) var(--space-6);
  opacity: 0.55;
}

.pitch-grid--contrast::after {
  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);
  opacity: 0.9;
}

.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-deep);
}

.media__img {
  width: 100%;
  height: 100%;
  min-height: 200px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.media--tall .media__img { aspect-ratio: 4 / 5; }
.media--wide .media__img { aspect-ratio: 21 / 9; }

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

.media__body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
}

.media__tag {
  display: inline-flex;
  margin-bottom: var(--space-1);
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  background: color-mix(in srgb, var(--color-contrast-surface) 62%, transparent);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-accent);
}

.media__title {
  margin: 0 0 var(--space-1);
  font-size: var(--text-lg);
  color: var(--color-contrast-ink);
}

.media__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

/* ============ 8. 头部骨架 ============ */
.skip-link {
  position: fixed;
  top: var(--space-1);
  left: var(--space-1);
  z-index: 200;
  padding: 10px var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  transform: translateY(-200%);
}

.skip-link:focus { transform: none; color: var(--color-contrast-ink); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 95;
  background: var(--color-surface-alt);
  border-bottom: var(--border-thick) solid var(--color-line);
}

.topline {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.topline__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  max-width: var(--container);
  margin-inline: auto;
  padding: 6px var(--gutter);
}

.topline__meta {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  min-width: 0;
}

.topline__text {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topline__sep {
  display: block;
  width: var(--border-thin);
  height: 12px;
  background: var(--color-contrast-line);
}

.topline__link {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-contrast-accent) 60%, transparent);
  white-space: nowrap;
}

.topline__link:hover { color: var(--color-contrast-ink); }

.rail {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--gutter);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  min-width: 0;
  color: var(--color-ink);
  text-decoration: none;
}

.brand:hover { color: var(--color-primary); }

.brand__flag {
  flex: none;
  width: 12px;
  height: 17px;
  background: var(--color-accent);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 76%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  line-height: 1.15;
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rail__vlabel { display: none; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  flex: none;
  padding: 8px 12px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}

.nav-toggle__bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 11px;
  border-top: var(--border-thick) solid currentColor;
  border-bottom: var(--border-thick) solid currentColor;
}

.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: var(--border-thin);
  background: currentColor;
  transform: translateY(-50%);
}

.nav-toggle[aria-expanded="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.railnav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  width: min(320px, 86vw);
  padding: 112px var(--space-3) var(--space-4);
  overflow-y: auto;
  background: var(--color-surface);
  border-left: var(--border-thick) solid var(--color-line);
  box-shadow: var(--shadow-2);
  transform: translateX(102%);
  visibility: hidden;
  transition: transform 0.28s ease, visibility 0.28s ease;
}

.railnav[data-open] {
  transform: translateX(0);
  visibility: visible;
}

.railnav__title {
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.28em;
  color: var(--color-ink-muted);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.railnav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0 0 var(--space-3);
  padding: 0;
  list-style: none;
}

.railnav__link {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: 10px var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  letter-spacing: 0.08em;
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}

.railnav__link:hover { color: var(--color-primary); }

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

.railnav__label { flex: 1 1 auto; }

.railnav__link[aria-current="page"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.railnav__link[aria-current="page"] .railnav__num {
  color: var(--color-primary-ink);
  opacity: 0.72;
}

.railnav__foot {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: var(--space-2);
  border-top: var(--border-thick) solid var(--color-line);
}

.railnav__note {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.railnav__quick {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.railnav__qlink {
  padding: 2px 0;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
}

.railnav__qlink:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.railnav__qlink--accent { color: var(--color-accent); }
.railnav__qlink--accent:hover { color: var(--color-focus); border-bottom-color: var(--color-focus); }

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: color-mix(in srgb, var(--color-contrast-surface) 62%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.24s ease;
}

body[data-nav-open] { overflow: hidden; }

body[data-nav-open] .nav-scrim {
  opacity: 1;
  pointer-events: auto;
}

.progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  height: 3px;
  background: color-mix(in srgb, var(--color-contrast-line) 45%, transparent);
  pointer-events: none;
}

.progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--color-focus);
  transition: width 0.12s linear;
}

/* ============ 9. 桌面侧边轨道 ============ */
@media (min-width: 1024px) {
  body { padding-left: 112px; }

  .skip-link { left: calc(112px + var(--space-1)); }

  .site-header {
    position: static;
    background: transparent;
    border-bottom: 0;
  }

  .topline { display: none; }

  .progress { left: 112px; }

  .nav-scrim { display: none; }

  .rail {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 96;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-3);
    width: 112px;
    max-width: none;
    margin: 0;
    padding: var(--space-4) var(--space-2) var(--space-3);
    overflow-y: auto;
    background: var(--color-surface-alt);
    border-right: var(--border-thick) solid var(--color-line);
  }

  .rail::after {
    content: "";
    position: fixed;
    top: 0;
    bottom: 0;
    left: calc(112px - 6px);
    width: var(--border-thin);
    background: var(--color-line);
    pointer-events: none;
  }

  .brand {
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    width: 100%;
    text-align: center;
  }

  .brand__flag { width: 14px; height: 20px; }

  .brand__text { align-items: center; }

  .brand__name {
    writing-mode: vertical-rl;
    text-orientation: upright;
    font-size: var(--text-xl);
    letter-spacing: 0.18em;
    padding-block: var(--space-1);
  }

  .brand__tagline { display: none; }

  .rail__vlabel {
    display: block;
    writing-mode: vertical-rl;
    text-orientation: upright;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: 0.3em;
    color: var(--color-ink-muted);
    padding-block: var(--space-1);
    border-top: var(--border-thin) solid var(--color-line);
    border-bottom: var(--border-thin) solid var(--color-line);
  }

  .nav-toggle { display: none; }

  .railnav {
    position: static;
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    min-height: 0;
    padding: 0;
    overflow: visible;
    background: transparent;
    border: 0;
    box-shadow: none;
    transform: none;
    visibility: visible;
  }

  .railnav__title { display: none; }

  .railnav__list {
    width: 100%;
    gap: 2px;
    margin: 0 0 auto;
  }

  .railnav__link {
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--space-1) 4px;
    font-size: var(--text-sm);
    letter-spacing: 0.1em;
    text-align: center;
    border-bottom: 0;
  }

  .railnav__label { flex: none; }

  .railnav__link[aria-current="page"] { position: relative; }

  .railnav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-contrast-accent);
  }

  .railnav__foot {
    width: 100%;
    align-items: center;
    gap: 4px;
    text-align: center;
  }

  .railnav__note {
    font-size: var(--text-xs);
    line-height: 1.5;
    letter-spacing: 0;
  }

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

  .to-top { right: var(--space-4); bottom: var(--space-4); }
}

@media (min-width: 1024px) and (max-height: 840px) {
  .rail { gap: var(--space-2); padding-block: var(--space-2); }
  .brand__name { font-size: var(--text-lg); }
  .rail__vlabel { font-size: var(--text-xs); letter-spacing: 0.2em; }
  .railnav { gap: var(--space-1); }
  .railnav__link { padding: 4px; }
  .railnav__note { display: none; }
}

@media (max-width: 560px) {
  .brand__tagline { display: none; }
  .topline__text { max-width: 46vw; }
}

/* ============ 10. 页脚 ============ */
.site-footer {
  position: relative;
  margin-top: var(--space-8);
  padding-block: var(--space-6) var(--space-4);
  background: var(--color-surface-alt);
  border-top: var(--border-thick) solid var(--color-line);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 0;
  right: 0;
  height: var(--border-thin);
  background: var(--color-line);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-footer__side {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.3em;
  color: var(--color-ink-muted);
  border-left: var(--border-thin) solid var(--color-line);
  padding-left: var(--space-2);
}

.site-footer__main { min-width: 0; }

.site-footer__brand {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  color: var(--color-ink);
}

.site-footer__contact {
  margin: 0 0 var(--space-1);
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.site-footer__note {
  margin: 0 0 var(--space-3);
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: 0 0 var(--space-3);
  padding: var(--space-2) 0 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.site-footer__links a {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink);
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.site-footer__links a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 70;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.to-top:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

@media (max-width: 720px) {
  .site-footer__inner { grid-template-columns: 1fr; gap: var(--space-3); }
  .site-footer__side { display: none; }
}

/* ============ 11. 动效 ============ */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ============ 12. 响应式收束 ============ */
@media (max-width: 900px) {
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }
  :root { --section-y: 64px; --section-y-lg: 88px; }
  .section-head { flex-direction: column; gap: var(--space-1); }
}

@media (max-width: 560px) {
  :root { --gutter: 16px; }
  .section-head__num { font-size: var(--text-xl); }
  .lede { font-size: var(--text-base); }
  .data-table th, .data-table td { padding: 8px 10px; }
}

/* ============ 13. 减少动态 ============ */
@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;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .railnav { transition: none; }
  .progress__bar { transition: none; }
}