/* ============================================================
   乐鱼体育 · 共享样式 /assets/site.css
   01 设计定稿变量（脚本生成，原样保留）
   ============================================================ */
:root {
  --color-surface: #222023;
  --color-surface-alt: #302e32;
  --color-surface-deep: #423f44;
  --color-ink: #c3bbc8;
  --color-ink-soft: #968a9e;
  --color-ink-muted: #82748b;
  --color-line: #3f3c41;
  --color-primary: #9a48d1;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #33263b;
  --color-accent: #26d943;
  --color-accent-ink: #151118;
  --color-highlight: #234129;
  --color-focus: #1ae53a;
  --color-contrast-surface: #efeef0;
  --color-contrast-ink: #343036;
  --color-contrast-line: #c6c4c7;
  --color-contrast-accent: #167925;
  --overlay-scrim: linear-gradient(180deg, rgba(239, 238, 240, 0.35) 0%, rgba(239, 238, 240, 0.72) 55%, rgba(239, 238, 240, 0.92) 100%);
  --font-heading: STZhongsong, "Source Han Serif SC", "Songti SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 9.5px;
  --text-sm: 13.5px;
  --text-base: 16px;
  --text-lg: 22.6px;
  --text-xl: 32.0px;
  --text-2xl: 45.2px;
  --text-3xl: 64.0px;
  --text-4xl: 90.4px;
  --text-display: clamp(43px, 8.8vw, 112px);
  --text-figure: clamp(36px, 6.3vw, 81px);
  --weight-heading: 689;
  --weight-body: 400;
  --leading-body: 1.73;
  --leading-heading: 1.28;
  --tracking-heading: 0.003em;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(195, 187, 200, 0.08);
  --shadow-2: 0 18px 44px rgba(195, 187, 200, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1100px;
  --measure: 65ch;
  --gutter: 24px;
  --section-y: 87px;
  --section-y-lg: 122px;
}

/* 02 派生令牌：轨道尺寸与金属细边 */
:root {
  --rail-w: 88px;
  --rail-h: 52px;
  --bar-h: 56px;
  --metal-line: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 34%, var(--color-line));
  --metal-line-soft: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 18%, var(--color-line));
  --ink-strong: color-mix(in srgb, var(--color-ink) 52%, var(--color-contrast-surface));
  --link-ink: color-mix(in srgb, var(--color-primary) 40%, var(--color-contrast-surface));
}

/* 03 重置与中文排版 */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -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);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

p { margin: 0 0 var(--space-3); text-wrap: pretty; }

ul, ol { margin: 0 0 var(--space-3); padding-left: 1.25em; }
li { margin-bottom: var(--space-1); }

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

a {
  color: var(--link-ink);
  text-decoration-color: color-mix(in srgb, var(--color-primary) 55%, transparent);
  text-underline-offset: 3px;
}
a:hover { color: var(--color-contrast-surface); }

button { font: inherit; color: inherit; }

.num,
.stat-value,
.footer-meta,
.season-tick__year,
.nav-index,
.section-index,
.breadcrumb {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: 0;
}

.eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
}

.lede {
  font-size: var(--text-lg);
  line-height: 1.5;
  color: color-mix(in srgb, var(--color-ink) 72%, var(--color-contrast-surface));
  max-width: var(--measure);
}

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

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

/* 04 布局骨架 */
.wrap {
  width: min(100% - (var(--gutter) * 2), var(--container));
  margin-inline: auto;
}

#main-content { display: block; }

@media (min-width: 901px) {
  #main-content { padding-left: var(--rail-w); padding-top: var(--rail-h); }
}

@media (max-width: 900px) {
  #main-content { padding-top: calc(var(--bar-h) + var(--rail-h)); }
}

/* 05 头部：跳转、进度、移动条、垂直轨道、赛季长廊 */
.site-header {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
}

.site-header > * { pointer-events: auto; }

.skip-link {
  position: fixed;
  top: var(--space-2);
  left: calc(var(--rail-w) + var(--space-2));
  z-index: 95;
  transform: translateY(calc(-100% - var(--space-4)));
  padding: 10px 18px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  text-decoration: none;
  box-shadow: var(--shadow-2);
  transition: transform 180ms ease-out;
}

.skip-link:focus-visible { transform: translateY(0); }

.scroll-progress {
  position: fixed;
  top: var(--rail-h);
  left: var(--rail-w);
  right: 0;
  height: 2px;
  z-index: 59;
  background: color-mix(in srgb, var(--color-line) 72%, transparent);
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  transition: width 140ms linear;
}

.header-bar { display: none; }

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: var(--radius-md);
  background: linear-gradient(140deg, var(--color-primary) 0%, color-mix(in srgb, var(--color-primary) 55%, var(--color-accent)) 100%);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--color-contrast-surface) 28%, transparent);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }

.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  color: var(--ink-strong);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 8px 12px;
  background: color-mix(in srgb, var(--color-surface-deep) 70%, transparent);
  border: var(--metal-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  cursor: pointer;
}

.nav-toggle[aria-expanded="true"] {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 65%, var(--color-line));
  color: var(--color-contrast-surface);
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 18px;
  height: 1px;
  background: currentColor;
  content: "";
}

.nav-toggle-bars { position: relative; }

.nav-toggle-bars::before { position: absolute; top: -5px; left: 0; }
.nav-toggle-bars::after { position: absolute; top: 5px; left: 0; }

/* 左侧垂直轨道 */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 70;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: 0 0 var(--space-3);
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--color-surface-deep) 86%, var(--color-surface)) 0%,
    color-mix(in srgb, var(--color-surface) 90%, var(--color-primary-soft)) 100%);
  border-right: var(--metal-line);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  transition: transform 220ms ease-out;
}

.brand--rail {
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  width: 100%;
  padding: var(--space-3) 0 var(--space-2);
  border-bottom: var(--metal-line-soft);
  flex: 0 0 auto;
}

.brand--rail .brand-name { writing-mode: vertical-rl; text-orientation: upright; letter-spacing: 0.2em; }
.brand--rail .brand-sub { display: none; }

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.nav-item { margin: 0; }

.nav-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 100%;
  min-height: 44px;
  padding: 6px 4px;
  border-left: 2px solid transparent;
  text-decoration: none;
  color: var(--color-ink-soft);
  transition: color 180ms ease-out, background-color 180ms ease-out, border-color 180ms ease-out;
}

.nav-link:hover {
  background: color-mix(in srgb, var(--color-surface-deep) 78%, transparent);
  color: var(--color-contrast-surface);
}

.nav-link[aria-current="page"] {
  background: var(--color-primary-soft);
  border-left-color: var(--color-primary);
  color: var(--color-contrast-surface);
}

.nav-index { font-size: var(--text-xs); color: var(--color-ink-muted); }
.nav-link[aria-current="page"] .nav-index { color: var(--color-accent); }

.nav-label {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  line-height: 1;
}

.nav-support {
  margin-top: auto;
  width: 100%;
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) 6px 0;
  border-top: var(--metal-line-soft);
}

.nav-support-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 2px 4px;
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
  text-decoration: none;
}

.nav-support-link:hover { color: var(--color-accent); }

.nav-support-note {
  margin: 0;
  font-size: var(--text-xs);
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  text-align: center;
}

/* 顶部赛季长廊 */
.season-rail {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  height: var(--rail-h);
  z-index: 58;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0 var(--space-3);
  background: color-mix(in srgb, var(--color-surface-deep) 72%, var(--color-surface));
  border-bottom: var(--metal-line);
}

.season-rail__hint {
  flex: 0 0 auto;
  margin: 0;
  padding-right: var(--space-2);
  border-right: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.season-rail__track {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 2px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
  cursor: grab;
  touch-action: pan-x;
}

.season-rail__track::-webkit-scrollbar { display: none; }
.season-rail__track.is-dragging { cursor: grabbing; }

.season-tick {
  flex: 0 0 auto;
  scroll-snap-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  width: 46px;
  padding: 2px 0;
  color: var(--color-ink-muted);
}

.season-tick__year { font-size: var(--text-sm); }

.season-tick__mark {
  width: 1px;
  height: 10px;
  background: var(--color-line);
}

.season-tick__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background: transparent;
}

.season-tick.is-current { color: var(--color-accent); }
.season-tick.is-current .season-tick__mark { width: 2px; height: 16px; background: var(--color-accent); }
.season-tick.is-current .season-tick__dot {
  background: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 24%, transparent);
}

.nav-scrim { display: none; }

/* 06 页脚：极简单行 */
.site-footer {
  margin-top: var(--section-y-lg);
  background: color-mix(in srgb, var(--color-surface-alt) 86%, var(--color-surface));
  border-top: var(--metal-line);
}

.footer-inner {
  width: min(100% - (var(--gutter) * 2), var(--container));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding: var(--space-3) 0;
}

.footer-brand {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.footer-links a {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  text-decoration: none;
}

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

.footer-meta {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.02em;
}

.footer-icp {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

@media (min-width: 901px) {
  .site-footer { padding-left: var(--rail-w); }
}

/* 07 通用栅格、章节与色带 */
.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-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

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

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-6);
}

.section-index {
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-primary);
}

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

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

.band {
  background: var(--color-surface-alt);
  border-block: var(--metal-line-soft);
  padding-block: var(--section-y);
}

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

.band--contrast h2,
.band--contrast h3,
.band--contrast h4 { color: var(--color-contrast-ink); }
.band--contrast a { color: var(--color-contrast-accent); }
.band--contrast .section-note,
.band--contrast .eyebrow { color: color-mix(in srgb, var(--color-contrast-ink) 74%, var(--color-contrast-surface)); }

.scale-rule {
  height: 12px;
  border-bottom: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 16px);
  background-repeat: repeat-x;
  background-size: 16px 6px;
  background-position: left bottom;
}

/* 08 内容块 */
.card {
  background: var(--color-surface-alt);
  border: var(--metal-line-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-1);
}

.card--soft {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 42%, var(--color-line));
}

.card--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
  box-shadow: var(--shadow-2);
}

.card--flush { padding: 0; overflow: hidden; }

.card-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  margin: 0 0 var(--space-2);
}

.card--contrast .card-title { color: var(--color-contrast-ink); }

.card-meta {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

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

.stat { display: flex; flex-direction: column; gap: var(--space-1); }

.stat-value {
  font-size: var(--text-figure);
  line-height: 1;
  color: var(--color-contrast-surface);
}

.stat--accent .stat-value { color: var(--color-accent); }
.stat--primary .stat-value { color: color-mix(in srgb, var(--color-primary) 55%, var(--color-contrast-surface)); }

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 30%, var(--color-line));
  background: color-mix(in srgb, var(--color-surface-deep) 60%, transparent);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

.tag--accent {
  border-color: color-mix(in srgb, var(--color-accent) 55%, transparent);
  color: var(--color-accent);
}

.tag--dot::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background: currentColor;
}

.mark {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-weight: 600;
}

.callout {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: inset 4px 0 0 var(--color-contrast-accent), var(--shadow-2);
}

.callout p:last-child { margin-bottom: 0; }
.callout a { color: var(--color-contrast-accent); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 10px 20px;
  border: var(--metal-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: background-color 180ms ease-out, color 180ms ease-out, border-color 180ms ease-out;
}

.btn:hover {
  background: var(--color-surface-deep);
  color: var(--color-contrast-surface);
  border-color: color-mix(in srgb, var(--color-primary) 60%, var(--color-line));
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: color-mix(in srgb, var(--color-primary) 70%, var(--color-contrast-surface));
}

.btn--primary: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);
  border-color: transparent;
}

.btn--accent:hover {
  background: color-mix(in srgb, var(--color-accent) 86%, var(--color-contrast-surface));
  color: var(--color-accent-ink);
}

.btn--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: transparent;
}

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

.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.breadcrumb li { display: flex; align-items: center; gap: var(--space-1); margin: 0; }
.breadcrumb li + li::before { content: "／"; color: var(--color-line); }
.breadcrumb a { color: var(--color-ink-soft); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb [aria-current="page"] { color: var(--color-contrast-surface); }

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-3); }
.prose h2 { font-size: var(--text-xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-lg); margin-top: var(--space-4); }
.prose p { margin: 0; }
.prose ul, .prose ol { padding-left: 1.25em; margin: 0; }

.prose blockquote {
  margin: 0;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-alt);
  border-left: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  color: var(--color-ink-soft);
}

.prose code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background: var(--color-surface-alt);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.data-table caption {
  caption-side: top;
  text-align: left;
  padding-bottom: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.data-table th {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  font-weight: 600;
}

.data-table td.num { color: var(--color-contrast-surface); }
.data-table tbody tr:hover { background: color-mix(in srgb, var(--color-surface-deep) 55%, transparent); }

.media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-alt);
  border: var(--metal-line-soft);
}

.media img { width: 100%; height: 100%; object-fit: cover; }

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--wide { aspect-ratio: 21 / 9; }

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

.media__caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 1;
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding: 4px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  width: fit-content;
}

.tab {
  appearance: none;
  border: 0;
  background: transparent;
  min-height: 44px;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background-color 180ms ease-out, color 180ms ease-out;
}

.tab:hover { background: var(--color-surface-deep); color: var(--color-contrast-surface); }

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

.tabpanel { padding-top: var(--space-4); animation: fade-in 120ms ease-out both; }
.tabpanel[hidden] { display: none; }

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.steps { list-style: none; margin: 0; padding: 0; position: relative; }

.steps::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: color-mix(in srgb, var(--color-primary) 55%, var(--color-line));
}

.step {
  position: relative;
  margin: 0;
  padding: var(--space-2) 0 var(--space-2) var(--space-6);
}

.step-node {
  position: absolute;
  left: 0;
  top: var(--space-2);
  display: grid;
  place-items: center;
  width: 31px;
  height: 31px;
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 62%, var(--color-line));
  color: var(--color-contrast-surface);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.step-title { font-size: var(--text-lg); margin: 0 0 var(--space-1); }

.fact-list { list-style: none; margin: 0; padding: 0; }

.fact-list li {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: space-between;
  align-items: baseline;
  margin: 0;
  padding: 10px 0;
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
}

.fact-list .num { color: var(--color-contrast-surface); }

[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 240ms ease-out, transform 240ms ease-out;
}

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

/* 09 移动端：抽屉、进度与页脚折行 */
@media (max-width: 900px) {
  html.nav-open { overflow: hidden; }

  .skip-link { left: var(--space-3); top: calc(var(--bar-h) + var(--rail-h) + var(--space-2)); }

  .header-bar {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--bar-h);
    z-index: 62;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding: 0 var(--space-3);
    background: color-mix(in srgb, var(--color-surface-deep) 80%, var(--color-surface));
    border-bottom: var(--metal-line);
  }

  .brand--bar .brand-sub { display: inline; }

  .season-rail { left: 0; top: var(--bar-h); }

  .scroll-progress { left: 0; top: calc(var(--bar-h) + var(--rail-h)); }

  .site-nav {
    width: min(84vw, 320px);
    align-items: stretch;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-3) var(--space-3);
    background: var(--color-surface-alt);
    border-right: var(--metal-line);
    box-shadow: var(--shadow-2);
    transform: translateX(-104%);
  }

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

  .brand--rail {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding: 0 0 var(--space-3);
  }

  .brand--rail .brand-name { writing-mode: horizontal-tb; letter-spacing: 0.1em; }
  .brand--rail .brand-sub { display: inline; }

  .nav-list { align-items: stretch; gap: var(--space-1); }

  .nav-link {
    flex-direction: row;
    align-items: center;
    gap: var(--space-2);
    padding: 12px var(--space-2);
    border-radius: var(--radius-sm);
    border-left-width: 2px;
  }

  .nav-index { font-size: var(--text-sm); }

  .nav-label {
    writing-mode: horizontal-tb;
    font-size: var(--text-base);
    letter-spacing: 0.08em;
  }

  .nav-support { align-items: flex-start; padding-top: var(--space-3); }

  .nav-support-link {
    writing-mode: horizontal-tb;
    font-size: var(--text-sm);
    letter-spacing: 0.06em;
  }

  .nav-support-note { text-align: left; }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 65;
    opacity: 0;
    pointer-events: none;
    background: color-mix(in srgb, var(--color-surface) 76%, transparent);
    transition: opacity 200ms ease-out;
  }

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

  .grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-12 { grid-column: span 4; }

  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }

  .footer-inner { padding: var(--space-3) 0 var(--space-4); }
  .footer-links { order: 3; flex-basis: 100%; }
  .footer-meta { flex-basis: 100%; }
}

/* 10 短屏与降级动效 */
@media (min-width: 901px) and (max-height: 940px) {
  .nav-list { gap: var(--space-1); }
  .nav-label { letter-spacing: 0.04em; }
  .nav-support-note { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}