/* ==========================================================================
   FH赛场 · 共享外壳与基础组件
   文件路径：/assets/site.css
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  --ink-900: #061019;
  --ink-800: #0A1622;
  --ink-700: #0D1E2E;
  --green: #1FD97E;
  --green-deep: #0E9E5A;
  --green-soft: #7CF0B8;
  --amber: #FFB020;
  --orange: #FF7A2F;
  --silver: #C3CFDA;
  --gray: #7E8C99;
  --paper: #F4F8FB;
  --glass: rgba(12, 24, 38, 0.72);
  --line: rgba(195, 207, 218, 0.16);
  --line-strong: rgba(195, 207, 218, 0.34);
  --font-sans: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --header-h: 76px;
  --header-h-sm: 60px;
  --shell-max: 1440px;
  --gutter: clamp(18px, 4vw, 56px);
  --radius: 2px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (max-width: 1024px) {
  :root {
    --header-h: 64px;
    --header-h-sm: 56px;
  }
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption, blockquote, dl, dd, dt {
  margin: 0;
}

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

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

a { color: inherit; text-decoration: none; }

button, input, select, textarea { font: inherit; color: inherit; }

button {
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

table { border-collapse: collapse; border-spacing: 0; }

[hidden] { display: none !important; }

/* ---------- 3. 中文排版与页面底色 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--silver);
  background-color: var(--ink-800);
  background-image:
    radial-gradient(1200px 640px at 84% -10%, rgba(31, 217, 126, 0.13), transparent 62%),
    radial-gradient(900px 520px at 4% 8%, rgba(255, 176, 32, 0.05), transparent 60%),
    linear-gradient(180deg, #0A1622 0%, #08121D 46%, #061019 100%);
  background-repeat: no-repeat;
  background-size: cover;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(195, 207, 218, 0.05) 0 1px, transparent 1px 120px),
    repeating-linear-gradient(0deg, rgba(195, 207, 218, 0.05) 0 1px, transparent 1px 120px);
  -webkit-mask-image: radial-gradient(ellipse 92% 68% at 50% 0%, #000 18%, transparent 78%);
  mask-image: radial-gradient(ellipse 92% 68% at 50% 0%, #000 18%, transparent 78%);
}

.site-header,
#main-content,
.site-footer {
  position: relative;
  z-index: 1;
}

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

p { text-wrap: pretty; }

::selection {
  background: rgba(31, 217, 126, 0.28);
  color: #ffffff;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

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

.muted {
  color: var(--gray);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  left: 16px;
  top: -72px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--green);
  color: #04140C;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: var(--radius);
  transition: top 0.18s var(--ease);
}

.skip-link:focus {
  top: 12px;
  outline-color: #FFFFFF;
}

/* ---------- 5. 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(8, 18, 29, 0.94);
  border-bottom-color: var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: var(--header-h);
  transition: height 0.2s var(--ease);
}

.site-header.is-scrolled .site-header__inner { height: var(--header-h-sm); }

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 0 1 auto;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border: 1px solid rgba(31, 217, 126, 0.55);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--green);
  background: linear-gradient(135deg, rgba(31, 217, 126, 0.18), rgba(6, 16, 25, 0.4));
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}

.brand__name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #FFFFFF;
}

.brand__sub {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gray);
  white-space: nowrap;
}

.brand:hover .brand__name { color: var(--green-soft); }

.brand--stacked { align-items: center; }

.season-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gray);
  background: rgba(6, 16, 25, 0.55);
  white-space: nowrap;
}

.season-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(31, 217, 126, 0.16);
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--silver);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.nav-toggle:hover { border-color: var(--green); color: var(--green-soft); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.2s var(--ease), top 0.2s var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 8px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 4px; transform: rotate(-45deg); }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(6, 16, 25, 0.55);
}

.site-nav__link {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: var(--silver);
  white-space: nowrap;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.site-nav__link:hover {
  background: rgba(195, 207, 218, 0.08);
  color: #FFFFFF;
}

.site-nav__link[aria-current="page"] {
  background: linear-gradient(135deg, var(--green), var(--green-deep));
  color: #04140C;
  font-weight: 600;
}

.site-nav__cta { flex: 0 0 auto; }

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 85;
  background: rgba(6, 16, 25, 0.62);
  opacity: 0;
  transition: opacity 0.2s var(--ease);
}

.nav-scrim.is-visible { opacity: 1; }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper);
  background: rgba(195, 207, 218, 0.04);
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.btn:hover {
  border-color: var(--green);
  color: var(--green-soft);
}

.btn--primary {
  border-color: transparent;
  color: #04140C;
  background: linear-gradient(135deg, var(--green), var(--green-deep));
}

.btn--primary:hover {
  color: #04140C;
  background: linear-gradient(135deg, var(--green-soft), var(--green));
  border-color: transparent;
  box-shadow: 0 0 0 1px rgba(124, 240, 184, 0.55);
}

.btn--ghost {
  border-style: dashed;
  color: var(--gray);
}

.btn--ghost:hover { color: var(--green-soft); }

.btn--sm { padding: 8px 14px; font-size: 13px; }

/* ---------- 7. 布局骨架 ---------- */
#main-content { padding-top: var(--header-h); }

.container {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.offset-header { padding-top: calc(var(--header-h) + 28px); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(24px, 3vw, 56px);
  align-items: start;
}

.split--5-7 { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.split--3-9 { grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); }

.rail { position: relative; min-width: 0; }

.rail__sticky {
  position: sticky;
  top: calc(var(--header-h) + 24px);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(12px, 1.5vw, 22px);
}

.col-3 { grid-column: span 3; min-width: 0; }
.col-4 { grid-column: span 4; min-width: 0; }
.col-5 { grid-column: span 5; min-width: 0; }
.col-6 { grid-column: span 6; min-width: 0; }
.col-7 { grid-column: span 7; min-width: 0; }
.col-8 { grid-column: span 8; min-width: 0; }
.col-12 { grid-column: span 12; min-width: 0; }

.section {
  padding: clamp(44px, 5.6vw, 92px) 0;
  border-top: 1px solid var(--line);
}

.section--flush { border-top: 0; padding-top: clamp(24px, 3vw, 48px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(20px, 2.4vw, 34px);
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

/* ---------- 8. 文字层级与索引标签 ---------- */
.display {
  font-size: clamp(42px, 7vw, 100px);
  font-weight: 200;
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: #FFFFFF;
}

.section-title {
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 600;
  color: var(--paper);
}

.lede {
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--silver);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
}

.eyebrow__num {
  font-family: var(--font-mono);
  color: var(--green);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
  background: rgba(6, 16, 25, 0.6);
}

.section-label__num {
  font-family: var(--font-mono);
  color: var(--green);
}

/* ---------- 9. 区块、卡片与拼贴块 ---------- */
.panel {
  position: relative;
  padding: clamp(18px, 2.2vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(13, 30, 46, 0.86), rgba(6, 16, 25, 0.88));
}

.panel::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 14px;
  height: 14px;
  border-top: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
  pointer-events: none;
}

.panel--paper {
  background: var(--paper);
  border-color: rgba(6, 16, 25, 0.14);
  color: #1C2A36;
}

.panel--paper h2,
.panel--paper h3,
.panel--paper .section-title { color: var(--ink-900); }

.panel--paper .muted { color: #5A6B78; }

.panel--glass {
  background: var(--glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(16px, 1.8vw, 22px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(10, 22, 34, 0.66);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.card:hover {
  border-color: rgba(124, 240, 184, 0.55);
  transform: translateY(-2px);
}

.tile {
  position: relative;
  overflow: hidden;
  padding: clamp(16px, 2vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(10, 22, 34, 0.7);
}

.tile--glass {
  background: var(--glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

/* ---------- 10. 数据表格 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(6, 16, 25, 0.66);
}

.data-table {
  width: 100%;
  min-width: 560px;
  font-size: 14.5px;
}

.data-table caption {
  padding: 14px 16px;
  text-align: left;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
  border-bottom: 1px solid var(--line);
}

.data-table th {
  padding: 12px 14px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
  border-bottom: 1px solid var(--line-strong);
  white-space: nowrap;
}

.data-table td {
  padding: 13px 14px;
  color: var(--silver);
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}

.data-table tbody tr:nth-child(even) { background: rgba(6, 16, 25, 0.5); }

.data-table tbody tr:hover {
  background: rgba(124, 240, 184, 0.08);
  box-shadow: inset 3px 0 0 var(--green-soft);
}

.data-table tbody tr:last-child td { border-bottom: 0; }

.data-table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: #FFFFFF;
}

/* ---------- 11. 标签、状态与统计 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--silver);
  background: rgba(6, 16, 25, 0.6);
  white-space: nowrap;
}

.tag--amber {
  color: var(--amber);
  border-color: rgba(255, 176, 32, 0.5);
  background: rgba(255, 176, 32, 0.1);
  font-weight: 700;
}

.tag--green {
  color: var(--green-soft);
  border-color: rgba(31, 217, 126, 0.45);
  background: rgba(31, 217, 126, 0.1);
}

.tag--mono { font-family: var(--font-mono); }

.rank-band {
  display: inline-block;
  width: 4px;
  height: 18px;
  border-radius: 1px;
  background: var(--gray);
  vertical-align: middle;
}

.rank-band--top { background: linear-gradient(180deg, var(--green-soft), var(--green)); }
.rank-band--mid { background: linear-gradient(180deg, var(--green), var(--green-deep)); }
.rank-band--low { background: var(--gray); }

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: #FFFFFF;
}

.stat__label {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
}

/* ---------- 12. 分段切换（标签页） ---------- */
.segmented {
  position: relative;
  display: inline-flex;
  gap: 2px;
  max-width: 100%;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(6, 16, 25, 0.72);
  overflow-x: auto;
  scrollbar-width: thin;
}

.segmented__ink {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 0;
  width: 0;
  border: 1px solid rgba(31, 217, 126, 0.5);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(31, 217, 126, 0.24), rgba(14, 158, 90, 0.24));
  pointer-events: none;
  transition: transform 0.18s var(--ease), width 0.18s var(--ease);
}

.tab {
  position: relative;
  z-index: 1;
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--gray);
  white-space: nowrap;
  transition: color 0.18s var(--ease);
}

.tab:hover { color: var(--paper); }

.tab[aria-selected="true"],
.tab.is-active { color: var(--green-soft); }

.tabpanel { padding-top: clamp(18px, 2.2vw, 26px); }

/* ---------- 13. 折叠面板 ---------- */
.collapse {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(6, 16, 25, 0.66);
  transition: border-color 0.24s var(--ease);
}

.collapse + .collapse { margin-top: 8px; }

.collapse.is-open { border-color: rgba(31, 217, 126, 0.45); }

.collapse__trigger {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
  transition: background-color 0.24s var(--ease), color 0.24s var(--ease);
}

.collapse__trigger:hover {
  background: rgba(195, 207, 218, 0.05);
  color: var(--green-soft);
}

.collapse__icon {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--green);
}

.collapse__icon::before { content: "+"; }
.collapse.is-open .collapse__icon::before { content: "\2013"; }

.collapse__panel {
  padding: 0 18px 18px;
  font-size: 14.5px;
  color: var(--silver);
}

/* ---------- 14. 图形容器（供页面阶段放置图片） ---------- */
.media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(135deg, rgba(31, 217, 126, 0.12), rgba(6, 16, 25, 0.92)),
    repeating-linear-gradient(90deg, rgba(195, 207, 218, 0.08) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(0deg, rgba(195, 207, 218, 0.08) 0 1px, transparent 1px 40px);
}

.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame > img,
.media-frame > svg,
.media-frame > picture,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__label {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 3px 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--silver);
  background: rgba(6, 16, 25, 0.72);
}

.media-caption {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 15. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 14px 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gray);
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.breadcrumbs a { transition: color 0.18s var(--ease); }
.breadcrumbs a:hover { color: var(--green-soft); }
.breadcrumbs [aria-current="page"] { color: var(--silver); }

/* ---------- 16. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 7vw, 110px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(6, 16, 25, 0.62), rgba(6, 16, 25, 0.98));
}

.site-footer__inner {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(38px, 5vw, 72px) var(--gutter) 26px;
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: start;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: flex-start;
}

.site-footer__tagline {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--silver);
}

.site-footer__addr {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--gray);
  max-width: 30ch;
}

.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 2.4vw, 36px);
}

.foot-col__title {
  margin-bottom: 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
}

.foot-col__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.foot-link {
  font-size: 14px;
  color: var(--silver);
  transition: color 0.18s var(--ease);
}

.foot-link:hover { color: var(--green-soft); }

.foot-meta {
  display: block;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--gray);
}

.copy-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 3px 0;
  text-align: left;
  font-size: 13.5px;
  color: var(--silver);
  transition: color 0.18s var(--ease);
}

.copy-btn:hover { color: var(--green-soft); }

.copy-btn__hint {
  flex: 0 0 auto;
  padding: 1px 6px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gray);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.copy-btn.is-copied .copy-btn__hint {
  color: var(--green);
  border-color: var(--green);
  border-style: solid;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  margin-top: clamp(30px, 4vw, 56px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.legal-line {
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--gray);
}

/* ---------- 17. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

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

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1180px) {
  .season-tag { display: none; }
}

@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 90;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
    width: min(368px, 88vw);
    margin-left: 0;
    padding: calc(var(--header-h) + 20px) 22px calc(24px + env(safe-area-inset-bottom, 0px));
    background: linear-gradient(180deg, #0A1622, #061019);
    border-left: 1px solid var(--line);
    overflow-y: auto;
    visibility: hidden;
    transform: translateX(102%);
    transition: transform 0.24s var(--ease), visibility 0.24s var(--ease);
  }

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

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0;
    border: 0;
    background: none;
  }

  .site-nav__link {
    padding: 15px 12px;
    font-size: 16px;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
  }

  .site-nav__link[aria-current="page"] {
    border-radius: var(--radius);
    padding-left: 14px;
  }

  body.nav-open { overflow: hidden; }

  .site-nav__cta {
    margin-top: auto;
    width: 100%;
    padding: 15px 20px;
  }

  .split,
  .split--5-7,
  .split--3-9 {
    grid-template-columns: minmax(0, 1fr);
  }

  .rail__sticky {
    position: static;
    top: auto;
  }

  .site-footer__top {
    grid-template-columns: minmax(0, 1fr);
  }

  .site-footer__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 24px;
  }

  .col-3, .col-4, .col-5, .col-6 { grid-column: span 6; }
  .col-7, .col-8 { grid-column: span 12; }
}

@media (max-width: 640px) {
  .site-header__inner { gap: 12px; }
  .brand__sub { display: none; }

  .site-footer__cols { grid-template-columns: minmax(0, 1fr); }

  .site-footer__legal { flex-direction: column; align-items: flex-start; }

  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }

  .grid-12 { gap: 12px; }
}

/* ---------- 19. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

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

  .card:hover { transform: none; }
}