/* ============================================================
   雅博体育 · 共享外壳与基础组件  /assets/site.css
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body, h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }

:root {
  --abyss-900: #050B1A;
  --navy-800: #0A1730;
  --navy-700: #12294D;
  --neon-400: #35F08A;
  --mint-200: #A6FFD4;
  --amber-400: #FFB63D;
  --sky-300: #6FC3FF;
  --frost-050: #EEF4FF;
  --slate-400: #8497B0;
  --line-tint: rgba(120, 180, 255, .14);
  --alert-coral: #FF6B7A;

  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell-max: 1240px;
  --gutter: clamp(16px, 4vw, 44px);
  --radius-pill: 999px;
  --radius-card: 18px;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --header-gap: clamp(10px, 1.6vw, 22px);
  --scroll-progress: 0;
}

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 620px at 78% -10%, rgba(53, 240, 138, .10), transparent 62%),
    radial-gradient(900px 520px at 6% 10%, rgba(111, 195, 255, .10), transparent 60%),
    var(--abyss-900);
  color: var(--frost-050);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-tint) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-tint) 1px, transparent 1px);
  background-size: 84px 84px;
  opacity: .16;
  -webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 72%);
}

:focus-visible {
  outline: 2px solid var(--neon-400);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection { background: rgba(53, 240, 138, .28); color: var(--frost-050); }

a { text-decoration: none; }

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.02em;
  color: var(--frost-050);
}

h1 { font-size: clamp(30px, 8.5vw, 54px); }
h2 { font-size: clamp(24px, 3.6vw, 38px); }
h3 { font-size: clamp(18px, 2.2vw, 22px); }

/* ---------- 通用工具 ---------- */
.numeric,
[data-count] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: .01em;
}

.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;
}

.container {
  width: min(100% - 2 * var(--gutter), var(--shell-max));
  margin-inline: auto;
}
.container--narrow { width: min(100% - 2 * var(--gutter), 820px); margin-inline: auto; }

main, #main-content {
  position: relative;
  z-index: 1;
  display: block;
  padding-top: clamp(96px, 12vw, 136px);
  scroll-margin-top: 110px;
}

.rule {
  height: 1px;
  border: 0;
  margin: clamp(22px, 3vw, 36px) 0;
  background: linear-gradient(90deg, transparent, var(--line-tint) 12%, var(--line-tint) 88%, transparent);
}

.label {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--slate-400);
}
.label--neon { color: var(--neon-400); }

.vertical-note {
  writing-mode: vertical-rl;
  font-size: 12px;
  letter-spacing: .28em;
  line-height: 1.2;
  color: var(--slate-400);
  text-transform: uppercase;
}

.prose {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate-400);
}
.prose p + p { margin-top: 1em; }
.prose strong { color: var(--frost-050); font-weight: 700; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition: color .3s var(--ease), background .3s var(--ease),
              border-color .3s var(--ease), box-shadow .4s var(--ease),
              transform .3s var(--ease);
}
.btn-primary {
  background: linear-gradient(135deg, var(--neon-400), var(--mint-200));
  color: #04160C;
  box-shadow: 0 12px 32px -16px rgba(53, 240, 138, .95);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px -16px rgba(53, 240, 138, .95);
}
.btn-ghost {
  background: rgba(18, 41, 77, .55);
  border-color: var(--line-tint);
  color: var(--frost-050);
}
.btn-ghost:hover {
  border-color: var(--mint-200);
  color: var(--mint-200);
  box-shadow: 0 0 0 3px rgba(166, 255, 212, .08);
}
.btn-sm { padding: 10px 18px; font-size: 13.5px; letter-spacing: .05em; }

/* ---------- 标签 / 胶囊筛选 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 7px;
  background: rgba(111, 195, 255, .12);
  color: var(--sky-300);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
}
.tag--neon { background: rgba(53, 240, 138, .12); color: var(--neon-400); }
.tag--amber { background: rgba(255, 182, 61, .12); color: var(--amber-400); }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 15px;
  border: 1px solid var(--line-tint);
  border-radius: var(--radius-pill);
  background: rgba(18, 41, 77, .45);
  color: var(--slate-400);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .04em;
  cursor: pointer;
  transition: color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}
.chip:hover { color: var(--frost-050); border-color: rgba(166, 255, 212, .45); }
.chip[aria-pressed="true"],
.chip.is-active {
  background: rgba(53, 240, 138, .14);
  border-color: var(--neon-400);
  color: var(--neon-400);
}

/* ---------- 章节 ---------- */
.band { position: relative; padding-block: clamp(52px, 8vw, 104px); }
.band--navy {
  background: linear-gradient(180deg,
    rgba(10, 23, 48, 0) 0%,
    rgba(10, 23, 48, .92) 16%,
    rgba(10, 23, 48, .92) 84%,
    rgba(10, 23, 48, 0) 100%);
}
.band--edge { padding-block: clamp(32px, 5vw, 64px); }

.chapter { position: relative; }
.chapter-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(22px, 3vw, 38px);
  max-width: 68ch;
}
.chapter-no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .24em;
  color: var(--neon-400);
}
.chapter-title { font-size: clamp(26px, 4.2vw, 42px); }
.chapter-sub {
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate-400);
}

/* ---------- 展览说明牌 ---------- */
.exhibit {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--line-tint);
  border-left: 2px solid var(--neon-400);
  border-radius: 12px;
  background: rgba(18, 41, 77, .34);
  transition: border-color .4s var(--ease), box-shadow .4s var(--ease);
}
.exhibit:hover {
  border-color: rgba(166, 255, 212, .5);
  border-left-color: var(--mint-200);
  box-shadow: 0 0 24px -8px rgba(53, 240, 138, .35);
}
.exhibit-title { font-size: 15px; font-weight: 700; color: var(--frost-050); }
.exhibit-meta {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate-400);
}
.exhibit-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 600;
  color: var(--amber-400);
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line-tint);
  border-radius: var(--radius-card);
  background: linear-gradient(160deg, rgba(18, 41, 77, .92), rgba(10, 23, 48, .92));
  box-shadow: 0 28px 60px -48px #000;
  transition: border-color .4s var(--ease), box-shadow .4s var(--ease), transform .4s var(--ease);
}
.card:hover {
  border-color: rgba(166, 255, 212, .5);
  box-shadow: 0 0 34px -14px rgba(53, 240, 138, .4);
}
.card--flat {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
}

/* ---------- 网格 ---------- */
.grid { display: grid; gap: clamp(16px, 2vw, 26px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 1.4fr) minmax(0, .9fr); }

/* ---------- 数据块 ---------- */
.stat { display: grid; gap: 4px; }
.stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: 1.1;
  color: var(--frost-050);
}
.stat-value--amber { color: var(--amber-400); }
.stat-label {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--slate-400);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--slate-400);
}
.breadcrumb a { color: var(--slate-400); transition: color .25s var(--ease); }
.breadcrumb a:hover { color: var(--mint-200); }
.breadcrumb [aria-current="page"] { color: var(--frost-050); }
.breadcrumb-sep { color: rgba(132, 151, 176, .5); }

/* ---------- 图片容器（页面阶段放图） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line-tint);
  border-radius: 16px;
  background: linear-gradient(150deg, var(--navy-700), var(--abyss-900));
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(200deg, rgba(111, 195, 255, .14), transparent 46%, rgba(53, 240, 138, .10));
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }

/* ---------- 目录 ---------- */
.toc { display: grid; gap: 4px; }
.toc-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 10px;
  border-left: 2px solid transparent;
  border-radius: 0 10px 10px 0;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--slate-400);
  transition: color .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}
.toc-link:hover { color: var(--frost-050); background: rgba(111, 195, 255, .07); }
.toc-link[aria-current="true"] {
  color: var(--neon-400);
  border-left-color: var(--neon-400);
  background: rgba(53, 240, 138, .08);
}

/* ---------- 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ============================================================
   头部：悬浮胶囊浮岛
   ============================================================ */
.skip-link {
  position: fixed;
  top: -96px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 130;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  background: var(--neon-400);
  color: #04160C;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  box-shadow: 0 16px 40px -18px rgba(53, 240, 138, .9);
  transition: top .28s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible {
  top: 12px;
  outline: 2px solid var(--frost-050);
  outline-offset: 3px;
}

.site-header {
  position: fixed;
  top: 14px;
  left: 0;
  right: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  gap: var(--header-gap);
  width: min(100% - 2 * var(--gutter), var(--shell-max));
  margin-inline: auto;
  padding: 9px 10px 9px 22px;
  border: 1px solid var(--line-tint);
  border-radius: var(--radius-pill);
  background: rgba(10, 23, 48, .74);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  box-shadow: 0 24px 60px -38px #000;
  transition: width .55s var(--ease), padding .45s var(--ease),
              background .35s var(--ease), border-color .35s var(--ease);
}
.site-header[data-scrolled="true"] {
  width: min(100% - 2 * var(--gutter), 1080px);
  padding-block: 7px;
  background: rgba(8, 19, 40, .9);
  border-color: rgba(166, 255, 212, .22);
}

.brand {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--frost-050);
}
.brand::before {
  content: "";
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--neon-400);
  box-shadow: 0 0 14px var(--neon-400);
}
.brand-mark {
  font-size: 19px;
  font-weight: 900;
  letter-spacing: .02em;
  line-height: 1;
  white-space: nowrap;
}
.brand-note {
  writing-mode: vertical-rl;
  height: 40px;
  max-width: 58px;
  overflow: hidden;
  padding-left: 10px;
  border-left: 1px solid var(--line-tint);
  font-size: 11px;
  letter-spacing: .12em;
  line-height: 1.25;
  color: var(--slate-400);
  transition: max-width .45s var(--ease), opacity .3s var(--ease),
              padding-left .45s var(--ease), border-color .3s var(--ease);
}
.site-header[data-scrolled="true"] .brand-note {
  max-width: 0;
  padding-left: 0;
  opacity: 0;
  border-color: transparent;
}

.nav-context {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  max-width: 0;
  overflow: hidden;
  opacity: 0;
  white-space: nowrap;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--slate-400);
  transition: max-width .45s var(--ease), opacity .3s var(--ease);
}
.site-header[data-scrolled="true"] .nav-context { max-width: 140px; opacity: 1; }
.nav-context-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--neon-400);
  box-shadow: 0 0 10px var(--neon-400);
}

.nav { display: flex; align-items: center; margin-left: auto; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 13px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--slate-400);
  transition: color .25s var(--ease), background .25s var(--ease), padding .35s var(--ease);
}
.nav-link:hover { color: var(--frost-050); background: rgba(111, 195, 255, .09); }
.nav-link[aria-current="page"] {
  color: var(--neon-400);
  background: rgba(53, 240, 138, .10);
}
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 14px;
  height: 2px;
  border-radius: 2px;
  transform: translateX(-50%);
  background: var(--neon-400);
  box-shadow: 0 0 10px var(--neon-400);
}
.site-header[data-scrolled="true"] .nav-link { padding: 9px 10px; }

.nav-panel-note {
  display: none;
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--slate-400);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.nav-progress {
  position: absolute;
  left: 16%;
  right: 16%;
  bottom: -9px;
  height: 2px;
  border-radius: 2px;
  overflow: hidden;
  background: rgba(120, 180, 255, .14);
  pointer-events: none;
}
.nav-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--sky-300), var(--neon-400) 58%, var(--amber-400));
  transition: width .12s linear;
}

/* 移动端底部三件套 */
.mobile-island { display: none; }

.island-brand {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 13px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--frost-050);
}
.island-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon-400);
  box-shadow: 0 0 10px var(--neon-400);
}
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 16px;
  border: 1px solid var(--line-tint);
  border-radius: var(--radius-pill);
  background: rgba(18, 41, 77, .85);
  color: var(--frost-050);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .06em;
  cursor: pointer;
  transition: border-color .3s var(--ease), color .3s var(--ease), background .3s var(--ease);
}
.nav-toggle:hover { border-color: rgba(166, 255, 212, .5); }
.nav-toggle[aria-expanded="true"] {
  border-color: var(--neon-400);
  color: var(--neon-400);
}
.nav-toggle-text { line-height: 1; }
.nav-toggle-bars {
  position: relative;
  display: block;
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: background .25s var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .25s var(--ease);
}
.nav-toggle-bars::before { top: -4px; }
.nav-toggle-bars::after { top: 4px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.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); }

.island-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--neon-400), var(--mint-200));
  color: #04160C;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  box-shadow: 0 10px 26px -16px rgba(53, 240, 138, .95);
}

body.nav-open { overflow: hidden; }

/* ============================================================
   页脚：长卷收束章
   ============================================================ */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(56px, 9vw, 112px);
  padding: clamp(46px, 7vw, 92px) 0 30px;
  overflow: hidden;
  border-top: 1px solid var(--line-tint);
  background: linear-gradient(180deg, rgba(5, 11, 26, 0) 0%, rgba(10, 23, 48, .9) 34%, #071223 100%);
}
.footer-glow {
  position: absolute;
  top: -160px;
  left: 50%;
  width: min(940px, 130%);
  height: 300px;
  transform: translateX(-50%);
  pointer-events: none;
  background: radial-gradient(closest-side, rgba(53, 240, 138, .20), rgba(111, 195, 255, .10) 55%, transparent 74%);
  filter: blur(4px);
}
.footer-inner {
  position: relative;
  width: min(100% - 2 * var(--gutter), var(--shell-max));
  margin-inline: auto;
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(250px, 1fr) minmax(0, 1.9fr);
  gap: clamp(28px, 5vw, 72px);
  padding-bottom: clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--line-tint);
}
.footer-brand { display: grid; align-content: start; gap: 0; }
.brand--footer { align-items: flex-start; gap: 14px; }
.brand--footer .brand-mark { font-size: 26px; letter-spacing: .01em; }
.brand--footer .brand-note { height: 62px; max-width: 62px; font-size: 11px; }

.footer-tagline {
  margin-top: 16px;
  max-width: 28ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate-400);
}
.footer-meta {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--sky-300);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
  padding: 10px 18px;
  border: 1px solid var(--line-tint);
  border-radius: var(--radius-pill);
  background: rgba(18, 41, 77, .55);
  color: var(--frost-050);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .06em;
  cursor: pointer;
  transition: border-color .3s var(--ease), color .3s var(--ease), transform .3s var(--ease);
}
.to-top:hover {
  border-color: var(--mint-200);
  color: var(--mint-200);
  transform: translateY(-1px);
}
.to-top-ring {
  position: relative;
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: conic-gradient(var(--neon-400) calc(var(--scroll-progress, 0) * 1%), rgba(120, 180, 255, .18) 0);
}
.to-top-ring::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--navy-800);
}
.to-top-ring::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 1;
  width: 6px;
  height: 6px;
  border-left: 2px solid var(--mint-200);
  border-top: 2px solid var(--mint-200);
  transform: translate(-50%, -30%) rotate(45deg);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 40px);
}
.footer-col-title {
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mint-200);
}
.footer-links { display: grid; gap: 10px; }
.footer-link {
  position: relative;
  display: inline-block;
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--slate-400);
  transition: color .25s var(--ease), transform .25s var(--ease);
}
.footer-link:hover { color: var(--frost-050); transform: translateX(2px); }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: clamp(14px, 2.4vw, 30px);
  padding: clamp(22px, 3vw, 34px) 0;
  border-bottom: 1px solid var(--line-tint);
}
.contact-item { display: grid; gap: 6px; align-content: start; }
.contact-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--slate-400);
}
.contact-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--frost-050);
  overflow-wrap: anywhere;
}
.contact-value--text {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: .01em;
  color: var(--slate-400);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 26px;
  padding-top: 20px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--slate-400);
}
.footer-copy { margin: 0; }
.footer-icp {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
  color: var(--slate-400);
}
.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin-left: auto;
}
.footer-legal-links .footer-link { font-size: 12px; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1199px) {
  .nav-context { display: none; }
}
@media (max-width: 1140px) {
  .header-actions .btn-ghost { display: none; }
  .nav-link { padding: 9px 10px; font-size: 13.5px; }
}

@media (max-width: 980px) {
  body { padding-bottom: 96px; }

  .site-header {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 0;
    margin: 0;
    padding: 0;
    gap: 0;
    border: 0;
    border-radius: 0;
    background: none;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .site-header[data-scrolled="true"] {
    width: 100%;
    padding: 0;
    background: none;
    border-color: transparent;
  }

  .brand,
  .nav-context,
  .header-actions,
  .nav-progress { display: none; }

  .nav {
    position: fixed;
    inset: 0;
    z-index: 94;
    display: block;
    margin: 0;
    padding: calc(env(safe-area-inset-top, 0px) + 88px) var(--gutter) 150px;
    overflow-y: auto;
    background:
      radial-gradient(700px 380px at 82% 0%, rgba(53, 240, 138, .16), transparent 66%),
      radial-gradient(600px 400px at 0% 20%, rgba(111, 195, 255, .14), transparent 62%),
      var(--abyss-900);
    opacity: 0;
    visibility: hidden;
    transform: translateY(14px);
    transition: opacity .35s var(--ease), transform .35s var(--ease), visibility .35s var(--ease);
  }
  .nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .nav-list {
    counter-reset: navitem;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }
  .nav-list li { counter-increment: navitem; }
  .nav-link {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    border: 1px solid transparent;
    border-radius: 16px;
    font-size: 21px;
    font-weight: 800;
    letter-spacing: -.01em;
    color: var(--frost-050);
  }
  .nav-link::before {
    content: "0" counter(navitem);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .16em;
    color: var(--slate-400);
  }
  .nav-link:hover { background: rgba(111, 195, 255, .08); }
  .nav-link[aria-current="page"] {
    background: rgba(53, 240, 138, .10);
    border-color: rgba(53, 240, 138, .34);
    color: var(--neon-400);
  }
  .nav-link[aria-current="page"]::after { display: none; }
  .nav-link[aria-current="page"]::before { color: var(--neon-400); }

  .nav-panel-note {
    display: block;
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid var(--line-tint);
  }

  .mobile-island {
    position: fixed;
    left: 50%;
    bottom: calc(14px + env(safe-area-inset-bottom, 0px));
    z-index: 96;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px;
    border: 1px solid var(--line-tint);
    border-radius: var(--radius-pill);
    background: rgba(10, 23, 48, .94);
    backdrop-filter: blur(16px) saturate(150%);
    -webkit-backdrop-filter: blur(16px) saturate(150%);
    box-shadow: 0 20px 50px -22px #000;
    transform: translateX(-50%);
  }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .grid--2, .grid--3, .grid--asym { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
  main, #main-content { padding-top: clamp(84px, 20vw, 104px); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-bottom { justify-content: flex-start; }
  .footer-legal-links { margin-left: 0; width: 100%; }
  .brand--footer .brand-note { height: 54px; }
}

@media (max-width: 420px) {
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
  .brand-mark { font-size: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .nav-progress-bar { transition: none; }
}