:root {
  --color-surface: #f8f8f9;
  --color-surface-alt: #efeff1;
  --color-surface-deep: #e3e3e5;
  --color-ink: #464653;
  --color-ink-soft: #6c6c7f;
  --color-ink-muted: #777788;
  --color-line: #d8d8db;
  --color-primary: #2b2dd4;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dbdcf4;
  --color-accent: #287ea4;
  --color-accent-ink: #ffffff;
  --color-highlight: #d3e2ea;
  --color-focus: #1c78a1;
  --color-contrast-surface: #0d0d19;
  --color-contrast-ink: #e4e4e7;
  --color-contrast-line: #3c3c46;
  --color-contrast-accent: #339ecc;
  --overlay-scrim: linear-gradient(180deg, rgba(13, 13, 25, 0.35) 0%, rgba(13, 13, 25, 0.72) 55%, rgba(13, 13, 25, 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: 12.9px;
  --text-sm: 15.5px;
  --text-base: 17px;
  --text-lg: 20.4px;
  --text-xl: 24.5px;
  --text-2xl: 29.4px;
  --text-3xl: 35.3px;
  --text-4xl: 42.3px;
  --text-display: clamp(40px, 8.3vw, 106px);
  --text-figure: clamp(33px, 5.9vw, 76px);
  --weight-heading: 658;
  --weight-body: 400;
  --leading-body: 1.8;
  --leading-heading: 1.15;
  --tracking-heading: -0.005em;
  --radius-sm: 14px;
  --radius-md: 14px;
  --radius-lg: 14px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(70, 70, 83, 0.08);
  --shadow-2: 0 18px 44px rgba(70, 70, 83, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1300px;
  --measure: 70ch;
  --gutter: 32px;
  --section-y: 99px;
  --section-y-lg: 139px;
}

/* ========== 基础 reset 与中文排版 ========== */
html {
  --rail-width: 248px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-block-start: var(--space-4);
  background-color: var(--color-surface);
}

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

body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; 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; }
a:hover { text-decoration: underline; text-underline-offset: 0.2em; }
:focus-visible { outline: calc(var(--border-thin) * 3) solid var(--color-focus); outline-offset: 2px; }
::selection { background: color-mix(in srgb, var(--color-primary) 26%, transparent); color: var(--color-contrast-surface); }

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  color: var(--color-ink);
  word-break: break-word;
  overflow-x: hidden;
  background-color: var(--color-surface);
  background-image:
    radial-gradient(1100px 620px at 8% -6%, color-mix(in srgb, var(--color-primary) 32%, transparent), transparent 66%),
    radial-gradient(980px 560px at 98% 6%, color-mix(in srgb, var(--color-accent) 28%, transparent), transparent 62%),
    radial-gradient(900px 660px at 68% 104%, color-mix(in srgb, var(--color-highlight) 92%, transparent), transparent 60%),
    linear-gradient(150deg, color-mix(in srgb, var(--color-primary-soft) 62%, transparent) 0%, transparent 42%, color-mix(in srgb, var(--color-highlight) 52%, transparent) 100%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  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); }
h5, h6 { font-size: var(--text-base); }
p { text-wrap: pretty; }

.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat-figure {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 600;
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}
.stat-label {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ========== 布局骨架 ========== */
.container { width: min(100% - var(--gutter) * 2, var(--container)); margin-inline: auto; }
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.stack { display: grid; gap: var(--space-3); }
.stack--tight { gap: var(--space-2); }
.stack--loose { gap: var(--space-6); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }
.grid-12 { 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; }

.prose { max-width: var(--measure); }
.prose > * + * { margin-block-start: var(--space-2); }
.prose h2 { margin-block-start: var(--space-6); font-size: var(--text-2xl); }
.prose h3 { margin-block-start: var(--space-4); font-size: var(--text-xl); }
.prose ul, .prose ol { padding-inline-start: 1.3em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-block-start: calc(var(--space-1) / 2); }
.prose a { border-block-end: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 45%, transparent); }
.prose strong { font-weight: 600; color: var(--color-ink); }

/* ========== 玻璃层与分节语言 ========== */
.layer-base {
  position: relative;
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  background-image:
    linear-gradient(140deg, color-mix(in srgb, var(--color-primary) 30%, transparent) 0%, color-mix(in srgb, var(--color-accent) 26%, transparent) 58%, color-mix(in srgb, var(--color-highlight) 76%, transparent) 100%);
}
.glass-panel {
  position: relative;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary-ink) 78%, transparent);
  background: color-mix(in srgb, var(--color-surface) 84%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(1.15);
  backdrop-filter: blur(18px) saturate(1.15);
  box-shadow: var(--shadow-1);
}
.glass-panel--flush { padding: 0; overflow: hidden; }
.glass-panel--tint { background: color-mix(in srgb, var(--color-primary-soft) 62%, transparent); }
.glass-panel--deep {
  background: color-mix(in srgb, var(--color-contrast-surface) 90%, transparent);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.glass-panel--deep h2, .glass-panel--deep h3, .glass-panel--deep h4 { color: var(--color-contrast-ink); }
.glass-panel--deep a { color: var(--color-contrast-accent); }

.rule-double {
  position: relative;
  padding-block-start: var(--space-2);
  border-block-start: var(--border-thick) solid var(--color-primary);
}
.rule-double::before {
  content: "";
  position: absolute;
  inset-block-start: calc(var(--space-1) / 2);
  inset-inline: 0;
  height: var(--border-thin);
  background: var(--color-line);
}

.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
  padding-block-start: var(--space-3);
  border-block-start: calc(var(--border-thin) * 3) solid var(--color-primary);
}
.section-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 600;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}
.section-kicker {
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.section-title { font-size: var(--text-2xl); }

/* ========== 按钮与标签 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.62em 1.15em;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid transparent;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: none; }
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background: color-mix(in srgb, var(--color-primary) 84%, var(--color-contrast-surface)); }
.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--ghost {
  background: color-mix(in srgb, var(--color-surface) 62%, transparent);
  color: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 45%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.btn--quiet { background: transparent; color: var(--color-ink); border-color: var(--color-line); }
.btn--contrast { background: var(--color-contrast-surface); color: var(--color-contrast-ink); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.18em 0.62em;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface-alt) 80%, transparent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
}
.tag--primary {
  background: var(--color-primary-soft);
  color: color-mix(in srgb, var(--color-primary) 88%, var(--color-contrast-surface));
  border-color: color-mix(in srgb, var(--color-primary) 30%, transparent);
}
.tag--accent {
  background: color-mix(in srgb, var(--color-accent) 16%, transparent);
  color: color-mix(in srgb, var(--color-accent) 82%, var(--color-contrast-surface));
  border-color: color-mix(in srgb, var(--color-accent) 38%, transparent);
}

/* ========== 面包屑 ========== */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.crumb a { color: var(--color-ink-soft); border-block-end: var(--border-thin) solid var(--color-line); }
.crumb a:hover { color: var(--color-primary); }
.crumb-sep { color: var(--color-ink-muted); }
.crumb-current { color: var(--color-ink); font-weight: 600; }

/* ========== 全宽深色数据条 ========== */
.data-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-3) var(--space-6);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-contrast-line);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.data-bar__label {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}
.data-bar__values { display: flex; flex-wrap: wrap; gap: var(--space-4); }
.data-bar__value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1;
  color: var(--color-contrast-accent);
}
.data-bar__unit { font-size: var(--text-xs); color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent); }

/* ========== 图像容器（直角、贴合内容边界） ========== */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: 0;
  background: var(--color-surface-deep);
}
.media-frame img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.media-frame--tall img { aspect-ratio: 3 / 4; }
.media-frame--wide img { aspect-ratio: 21 / 9; }
.media-frame__scrim { position: absolute; inset: 0; background: var(--overlay-scrim); pointer-events: none; }
.media-frame__caption {
  position: absolute;
  inset-block-end: 0;
  inset-inline: 0;
  padding: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
}
.media-frame__stat {
  position: absolute;
  inset-block-start: var(--space-2);
  inset-inline-start: var(--space-2);
  padding: 0.28em 0.6em;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-contrast-ink) 24%, transparent);
  background: color-mix(in srgb, var(--color-contrast-surface) 68%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-contrast-ink);
}

/* ========== 表格 ========== */
.table-wrap { overflow-x: auto; border-radius: var(--radius-sm); }
.data-table { width: 100%; border-collapse: collapse; font-size: var(--text-sm); }
.data-table caption {
  caption-side: top;
  padding-block-end: var(--space-1);
  text-align: start;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.data-table th {
  padding: 0.7em 0.8em;
  text-align: start;
  white-space: nowrap;
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-ink);
  border-block-end: var(--border-thick) solid var(--color-primary);
}
.data-table td {
  padding: 0.7em 0.8em;
  border-block-end: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
  vertical-align: top;
}
.data-table tbody tr:nth-child(even) { background: var(--color-surface-alt); }
.data-table th.num, .data-table td.num { text-align: end; font-family: var(--font-mono); }

/* ========== 标签页 / 折页 ========== */
.tabs { display: grid; gap: var(--space-3); }
.tab-list {
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
  border-block-end: var(--border-thick) solid var(--color-line);
  scrollbar-width: none;
}
.tab-list::-webkit-scrollbar { height: 0; }
.tab {
  flex: 0 0 auto;
  padding: 0.55em 0.95em;
  border-block-end: calc(var(--border-thick) * 2) solid transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}
.tab:hover { color: var(--color-primary); }
.tab[aria-selected="true"] {
  color: var(--color-primary);
  border-block-end-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary-soft) 50%, transparent);
}
.tab-panel[hidden] { display: none; }
.tab-panel { padding-block-start: var(--space-2); }

.accordion { border-block-start: var(--border-thick) solid var(--color-primary); }
.acc-item { border-block-end: var(--border-thin) solid var(--color-line); }
.acc-trigger {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-ink);
}
.acc-trigger::-webkit-details-marker { display: none; }
.acc-trigger::after { content: "+"; font-family: var(--font-mono); color: var(--color-accent); }
.acc-item[open] .acc-trigger::after { content: "–"; }
.acc-panel { padding-block-end: var(--space-2); max-width: var(--measure); color: var(--color-ink-soft); }

/* ========== 头部：框架式导航 ========== */
.skip-link {
  position: fixed;
  z-index: 200;
  inset-block-start: var(--space-2);
  inset-inline-start: var(--space-2);
  padding: 0.6em 1em;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  transform: translateY(calc(-100% - var(--space-6)));
  transition: transform 0.2s ease;
}
.skip-link:focus { transform: translateY(0); text-decoration: none; }

.scroll-progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: calc(var(--border-thin) * 3);
  z-index: 120;
  background: color-mix(in srgb, var(--color-line) 55%, transparent);
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.site-header {
  position: fixed;
  z-index: 80;
  display: flex;
  gap: var(--space-3);
  color: var(--color-ink);
  background: color-mix(in srgb, var(--color-surface) 76%, transparent);
  -webkit-backdrop-filter: blur(22px) saturate(1.2);
  backdrop-filter: blur(22px) saturate(1.2);
}

.brand { display: block; color: inherit; }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-block;
  padding: 0.22em 0.5em;
  border-radius: calc(var(--radius-sm) / 3);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
}
.brand-name {
  display: block;
  margin-block-start: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  line-height: 1.2;
}
.brand-meta { display: block; font-size: var(--text-xs); color: var(--color-ink-muted); }

.rail-statement {
  margin-block-start: var(--space-2);
  padding-inline-start: var(--space-1);
  border-inline-start: calc(var(--border-thin) * 3) solid var(--color-accent);
  font-size: var(--text-xs);
  line-height: 1.55;
  color: var(--color-ink-soft);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.42em 0.8em;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface) 80%, transparent);
  color: var(--color-ink);
  font-size: var(--text-sm);
  cursor: pointer;
}
.nav-toggle-bars { position: relative; display: block; width: 18px; height: 10px; }
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  width: 100%;
  height: calc(var(--border-thin) * 2);
  background: currentColor;
  transition: transform 0.2s ease;
}
.nav-toggle-bars::before { inset-block-start: 0; }
.nav-toggle-bars::after { inset-block-end: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-4px) rotate(-45deg); }

.site-nav { font-size: var(--text-base); }
.nav-list { display: flex; flex-direction: column; gap: calc(var(--space-1) / 2); }
.nav-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-2);
  padding: 0.5em 0.6em;
  border-radius: var(--radius-sm);
  border-inline-start: calc(var(--border-thin) * 3) solid transparent;
  color: var(--color-ink);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.nav-link:hover { background: color-mix(in srgb, var(--color-primary-soft) 60%, transparent); text-decoration: none; }
.nav-link[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-inline-start-color: var(--color-accent);
}
.nav-index { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-muted); }
.nav-link[aria-current="page"] .nav-index { color: color-mix(in srgb, var(--color-primary-ink) 78%, transparent); }
.nav-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.league-switch { display: grid; gap: var(--space-1); }
.league-switch-title {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.league-track {
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
  padding-block-end: var(--space-1);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.league-track::-webkit-scrollbar { height: 0; }
.league-chip {
  flex: 0 0 auto;
  padding: 0.3em 0.72em;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface) 72%, transparent);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.league-chip:hover { border-color: var(--color-accent); color: var(--color-accent); }
.league-chip[aria-pressed="true"] {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.rail-foot { margin-block-start: auto; }
.rail-cta {
  display: block;
  padding: 0.6em 1em;
  border-radius: var(--radius-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-align: center;
}
.rail-cta:hover {
  text-decoration: none;
  background: color-mix(in srgb, var(--color-contrast-surface) 82%, var(--color-accent));
}

/* 桌面：左侧框架栏，成为页面视觉边框 */
@media (min-width: 1024px) {
  body { padding-inline-start: var(--rail-width); }
  .scroll-progress { inset-inline-start: var(--rail-width); }
  .site-header {
    inset-block: 0;
    inset-inline-start: 0;
    width: var(--rail-width);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-6) var(--space-3) var(--space-4);
    border-inline-end: var(--border-thick) solid var(--color-primary);
    overflow-y: auto;
  }
  .site-header::after {
    content: "";
    position: absolute;
    inset-block: 0;
    inset-inline-end: 4px;
    width: var(--border-thin);
    background: var(--color-line);
    pointer-events: none;
  }
  .nav-toggle { display: none; }
  .site-nav { flex: 1 1 auto; }
}

/* 移动 / 平板：底部框架条 */
@media (max-width: 1023px) {
  body { padding-block-end: 124px; }
  .site-header {
    inset-inline: 0;
    inset-block-end: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-1) var(--space-2);
    padding: var(--space-2) var(--space-2) calc(var(--space-2) + env(safe-area-inset-bottom, 0px));
    border-block-start: var(--border-thick) solid var(--color-primary);
  }
  .site-header::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-start: 4px;
    height: var(--border-thin);
    background: var(--color-line);
    pointer-events: none;
  }
  .rail-top { grid-column: 1; grid-row: 1; min-width: 0; }
  .nav-toggle { grid-column: 2; grid-row: 1; }
  .league-switch { grid-column: 1 / -1; grid-row: 2; }
  .rail-foot { display: none; }
  .brand-name {
    margin-block-start: calc(var(--space-1) / 2);
    font-size: var(--text-base);
    display: inline-block;
  }
  .brand-mark { font-size: var(--text-xs); }
  .brand-meta { display: none; }
  .rail-statement {
    margin-block-start: calc(var(--space-1) / 2);
    border-inline-start-width: calc(var(--border-thin) * 2);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .site-nav { display: block; }
  html.has-js .site-nav {
    position: absolute;
    inset-inline: var(--space-2);
    inset-block-end: calc(100% + var(--space-2));
    display: none;
    max-height: 60vh;
    overflow-y: auto;
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    border: var(--border-thin) solid color-mix(in srgb, var(--color-primary-ink) 72%, transparent);
    background: color-mix(in srgb, var(--color-surface) 94%, transparent);
    -webkit-backdrop-filter: blur(20px) saturate(1.15);
    backdrop-filter: blur(20px) saturate(1.15);
    box-shadow: var(--shadow-2);
  }
  html.has-js .site-nav[data-open] { display: block; }
  .nav-link { padding: 0.6em 0.7em; }
}

/* ========== 页脚：同色延续，双线分节 ========== */
.site-footer {
  position: relative;
  margin-block-start: var(--space-8);
  padding-block: var(--space-6) var(--space-4);
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(1.1);
  backdrop-filter: blur(18px) saturate(1.1);
  color: var(--color-ink);
}
.footer-rule {
  position: absolute;
  inset-block-start: 0;
  inset-inline: 0;
  height: calc(var(--border-thin) * 3);
  background: var(--color-primary);
}
.footer-rule::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-start: var(--space-1);
  height: var(--border-thin);
  background: var(--color-accent);
}
.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1.1fr);
  gap: var(--space-6);
  align-items: start;
}
.footer-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}
.footer-tag { margin-block-start: var(--space-1); font-size: var(--text-sm); color: var(--color-ink-soft); }
.footer-note {
  margin-block-start: var(--space-2);
  max-width: 46ch;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-muted);
}
.footer-cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
.footer-col-title {
  margin-block-end: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.footer-links { display: grid; gap: var(--space-1); }
.footer-links a { font-size: var(--text-sm); color: var(--color-ink); }
.footer-links a:hover { color: var(--color-primary); }
.footer-contact { min-width: 0; }
.footer-facts { display: grid; gap: var(--space-1); font-size: var(--text-sm); color: var(--color-ink-soft); }
.footer-facts a { color: var(--color-primary); }
.fact-key {
  display: inline-block;
  min-width: 5.4em;
  margin-inline-end: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  margin-block-start: var(--space-6);
  padding-block-start: var(--space-3);
  border-block-start: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.footer-icp { font-family: var(--font-mono); letter-spacing: 0.06em; }
.footer-links-inline a { color: var(--color-ink-soft); }

/* ========== 动效与显现 ========== */
[data-reveal] { transition: opacity 0.55s ease, transform 0.55s ease; }
html.has-js [data-reveal]:not(.is-visible) { opacity: 0; transform: translateY(14px); }

@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]:not(.is-visible) { opacity: 1; transform: none; }
  .btn:hover, .league-chip:hover { transform: none; }
}

/* ========== 响应式 ========== */
@media (max-width: 1023px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: var(--space-3); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 6; }
  .col-12 { grid-column: span 6; }
  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }
  .footer-inner { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
  .site-footer { margin-block-start: var(--space-6); padding-block: var(--space-4); }
}
@media (max-width: 640px) {
  .section-head { grid-template-columns: minmax(0, 1fr); gap: var(--space-2); }
  .glass-panel { padding: var(--space-3); }
  .data-bar { padding: var(--space-2) var(--space-3); }
  .footer-legal { justify-content: flex-start; }
}