/* ============================================================
   新博体育登录 · 共享站点样式 /assets/site.css
   夜间看台 × 数据控制室：窄侧轨导航、竖排栏目、矿物色分区
   ============================================================ */

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

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

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

ul, ol { list-style: none; }

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

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

main { display: block; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink-900: #0B1210;
  --pitch-950: #0F1F19;
  --pitch-800: #16352A;
  --moss-500: #5E8C6A;
  --mineral-300: #B9C2B6;
  --bone-100: #EFE9DC;
  --clay-500: #B66A4A;
  --neon-400: #4CF5C8;
  --amber-400: #FFA24C;
  --slate-700: #2A3532;

  --bg: var(--ink-900);
  --surface: var(--pitch-950);
  --surface-2: var(--pitch-800);
  --text: var(--bone-100);
  --text-dim: var(--mineral-300);
  --line: var(--slate-700);
  --accent: var(--neon-400);
  --status: var(--amber-400);

  --rail-w: 0px;
  --header-h: 60px;
  --content-max: 1280px;
  --gutter: clamp(20px, 4.5vw, 64px);

  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-pill: 999px;

  --font-display: "HarmonyOS Sans SC", "Noto Sans SC", "Source Han Sans SC",
    "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "HarmonyOS Sans SC",
    "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --font-num: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular,
    "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-left: var(--rail-w);
}

body.no-scroll { overflow: hidden; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--bone-100);
  text-wrap: balance;
}

h1 { font-size: clamp(2.6rem, 7vw, 6rem); line-height: 1.02; }
h2 { font-size: clamp(1.8rem, 4vw, 3.4rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.6rem); }
h4 { font-size: 1.05rem; letter-spacing: 0.06em; }

strong { font-weight: 700; color: var(--bone-100); }

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

#main-content { scroll-margin-top: calc(var(--header-h) + 16px); }

/* ---------- 4. 通用文字组件 ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(2.6rem, 7vw, 6rem);
  line-height: 0.98;
  letter-spacing: -0.005em;
  color: var(--bone-100);
}

.h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 3.4rem);
  line-height: 1.12;
  color: var(--bone-100);
}

.h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 2vw, 1.6rem);
  line-height: 1.24;
  color: var(--bone-100);
}

.eyebrow {
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--moss-500);
}

.lede {
  font-size: clamp(1.02rem, 1.5vw, 1.22rem);
  line-height: 1.8;
  color: var(--mineral-300);
}

.dim { color: var(--mineral-300); }

.data-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- 5. 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--wide { max-width: 1480px; }

.section { padding-block: clamp(56px, 8vw, 120px); }
.section--tight { padding-block: clamp(32px, 4vw, 64px); }
.section--pitch { background: var(--pitch-950); }
.section--moss { background: var(--pitch-800); }

.divider {
  height: 1px;
  border: 0;
  margin-block: clamp(28px, 4vw, 56px);
  background: var(--slate-700);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 32px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--collage { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  padding: 0.78em 1.5em;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-align: center;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--neon-400);
  color: var(--ink-900);
}
.btn--primary:hover { background: #7CFBD8; }

.btn--ghost {
  background: rgba(22, 53, 42, 0.55);
  color: var(--bone-100);
  border-color: var(--slate-700);
}
.btn--ghost:hover { border-color: var(--moss-500); color: var(--neon-400); }

.btn--clay { background: var(--clay-500); color: var(--bone-100); }
.btn--clay:hover { background: #C97A57; }

.btn--small { padding: 0.5em 1em; font-size: 0.8rem; }

.copy-btn.is-copied {
  border-color: var(--neon-400);
  color: var(--neon-400);
}
.copy-btn.is-copy-failed {
  border-color: var(--amber-400);
  color: var(--amber-400);
}

/* ---------- 7. 标签与状态 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.28em 0.8em;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(94, 140, 106, 0.32);
  background: rgba(94, 140, 106, 0.16);
  color: var(--mineral-300);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.tag--clay {
  background: rgba(182, 106, 74, 0.16);
  border-color: rgba(182, 106, 74, 0.42);
  color: #E0A084;
}
.tag--neon {
  background: rgba(76, 245, 200, 0.12);
  border-color: rgba(76, 245, 200, 0.4);
  color: var(--neon-400);
}
.tag--amber {
  background: rgba(255, 162, 76, 0.14);
  border-color: rgba(255, 162, 76, 0.42);
  color: var(--amber-400);
}

.live-dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber-400);
  animation: nb-pulse 2.6s var(--ease) infinite;
}

@keyframes nb-pulse {
  0% { box-shadow: 0 0 0 0 rgba(255, 162, 76, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(255, 162, 76, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 162, 76, 0); }
}

/* ---------- 8. 媒体容器（页面阶段放图） ---------- */
.media {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(130% 100% at 15% 0%, rgba(76, 245, 200, 0.16), transparent 62%),
    linear-gradient(155deg, var(--pitch-800) 0%, var(--pitch-950) 55%, var(--ink-900) 100%);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    linear-gradient(to right, rgba(185, 194, 182, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(185, 194, 182, 0.07) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(120% 92% at 72% 108%, #000 2%, transparent 72%);
  mask-image: radial-gradient(120% 92% at 72% 108%, #000 2%, transparent 72%);
}

.media__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 18px 20px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--mineral-300);
  background: linear-gradient(to top, rgba(11, 18, 16, 0.92), rgba(11, 18, 16, 0));
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media--band { aspect-ratio: 3 / 1; }

/* ---------- 9. 面板与面包屑 ---------- */
.panel {
  background: var(--pitch-950);
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 36px);
}

.panel--moss { background: var(--pitch-800); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  font-size: 0.8rem;
  color: var(--mineral-300);
}

.breadcrumb__link {
  color: var(--mineral-300);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.breadcrumb__link:hover {
  color: var(--neon-400);
  border-bottom-color: rgba(76, 245, 200, 0.5);
}

.breadcrumb__sep { color: var(--moss-500); }

.breadcrumb__current { color: var(--bone-100); font-weight: 600; }

/* ---------- 10. 头部：跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 999;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--neon-400);
  color: var(--ink-900);
  font-weight: 700;
  font-size: 0.85rem;
  transform: translateY(-200%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 11. 头部：侧轨 ---------- */
.site-header { position: relative; z-index: 100; }

.track { display: none; }

.track__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.track__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--neon-400);
  color: var(--ink-900);
  font-family: var(--font-num);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  box-shadow: 0 0 0 4px rgba(76, 245, 200, 0.12);
}

.track__brand-name {
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--bone-100);
}

.track__version {
  padding: 3px 8px;
  border: 1px solid rgba(182, 106, 74, 0.5);
  border-radius: var(--radius-pill);
  font-family: var(--font-num);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: var(--clay-500);
}

.track__nav { width: 100%; }

.nav-list {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.nav-link {
  position: relative;
  display: flex;
  color: var(--mineral-300);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.nav-link::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 50%;
  width: 3px;
  height: 0;
  border-radius: 3px;
  background: var(--neon-400);
  transform: translateY(-50%);
  transition: height 0.24s var(--ease);
}

.track .nav-item + .nav-item { margin-top: 4px; }

.track .nav-link {
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 7px 0;
}

.track .nav-link:hover { color: var(--bone-100); }
.track .nav-link[aria-current="page"] { color: var(--neon-400); }
.track .nav-link[aria-current="page"]::before { height: 72%; }

.nav-index {
  font-family: var(--font-num);
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  color: var(--moss-500);
  transition: color 0.18s var(--ease);
}

.track .nav-link[aria-current="page"] .nav-index { color: var(--neon-400); }

.track .nav-label {
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.22em;
}

.track__utility {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding-inline: 8px;
}

.legacy-link {
  writing-mode: vertical-rl;
  padding: 12px 7px;
  border: 1px solid rgba(94, 140, 106, 0.45);
  border-radius: var(--radius-pill);
  background: rgba(22, 53, 42, 0.5);
  color: var(--mineral-300);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.legacy-link:hover { border-color: var(--moss-500); color: var(--bone-100); }

.live-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  color: var(--amber-400);
}

.live-label {
  writing-mode: vertical-rl;
  font-size: 0.62rem;
  letter-spacing: 0.2em;
}

.track .copy-btn {
  writing-mode: vertical-rl;
  padding: 10px 6px;
  border: 1px dashed var(--slate-700);
  border-radius: var(--radius-pill);
  color: var(--moss-500);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.track .copy-btn:hover { color: var(--neon-400); border-color: var(--moss-500); }

/* ---------- 12. 头部：移动条 ---------- */
.mobile-bar {
  position: sticky;
  top: 0;
  z-index: 110;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: var(--header-h);
  padding: 10px var(--gutter);
  background: rgba(11, 18, 16, 0.94);
  border-bottom: 1px solid var(--slate-700);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.mobile-bar__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.mobile-bar__mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--neon-400);
  color: var(--ink-900);
  font-family: var(--font-num);
  font-size: 0.72rem;
  font-weight: 700;
}

.mobile-bar__name {
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--bone-100);
}

.menu-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 14px;
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-pill);
  background: var(--pitch-800);
  color: var(--bone-100);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.menu-toggle:hover { border-color: var(--moss-500); color: var(--neon-400); }

.menu-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.menu-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.site-header[data-open="true"] .menu-toggle__bars span:nth-child(1) {
  transform: translateY(3px) rotate(45deg);
}
.site-header[data-open="true"] .menu-toggle__bars span:nth-child(2) {
  transform: translateY(-3px) rotate(-45deg);
}
.site-header[data-open="true"] .menu-toggle {
  border-color: var(--neon-400);
  color: var(--neon-400);
}

/* ---------- 13. 头部：抽屉 ---------- */
.drawer {
  position: fixed;
  inset: 0;
  z-index: 105;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: calc(var(--header-h) + 20px) var(--gutter) 36px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background:
    radial-gradient(120% 70% at 90% 0%, rgba(76, 245, 200, 0.1), transparent 60%),
    linear-gradient(165deg, var(--pitch-950), var(--ink-900) 78%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-14px);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease),
    visibility 0.22s var(--ease);
}

.site-header[data-open="true"] .drawer {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.drawer__title {
  font-family: var(--font-num);
  font-size: 0.68rem;
  letter-spacing: 0.32em;
  color: var(--moss-500);
}

.drawer__nav { width: 100%; }

.drawer .nav-item + .nav-item { margin-top: 6px; }

.drawer .nav-link {
  flex-direction: row;
  align-items: baseline;
  gap: 14px;
  padding: 13px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--bone-100);
}

.drawer .nav-link::before { display: none; }

.drawer .nav-link:hover {
  background: rgba(22, 53, 42, 0.7);
  border-color: var(--slate-700);
}

.drawer .nav-link[aria-current="page"] {
  background: rgba(76, 245, 200, 0.09);
  border-color: rgba(76, 245, 200, 0.4);
  color: var(--neon-400);
}

.drawer .nav-index { font-size: 0.7rem; }

.drawer .nav-label {
  writing-mode: horizontal-tb;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.drawer__utility {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--slate-700);
}

.drawer__meta {
  margin-top: auto;
  font-family: var(--font-num);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--moss-500);
}

/* ---------- 14. 头部：阅读进度 ---------- */
.scroll-progress {
  position: fixed;
  z-index: 130;
  pointer-events: none;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--neon-400), var(--amber-400));
  transform: scaleX(var(--sp, 0));
  transform-origin: 0 50%;
}

/* ---------- 15. 页脚 ---------- */
.site-footer {
  position: relative;
  padding-block: clamp(40px, 6vw, 80px) clamp(24px, 3vw, 40px);
  background: var(--ink-900);
  color: var(--mineral-300);
  border-top: 1px solid var(--slate-700);
}

.footer__accent {
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 3px;
  opacity: 0.8;
  background: linear-gradient(
    90deg,
    var(--clay-500) 0%,
    var(--moss-500) 32%,
    var(--neon-400) 72%,
    var(--amber-400) 100%
  );
}

.footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1.4fr) minmax(0, 1.3fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: start;
}

.footer__brandlink {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--neon-400);
  color: var(--ink-900);
  font-family: var(--font-num);
  font-size: 0.86rem;
  font-weight: 700;
  box-shadow: 0 0 0 4px rgba(76, 245, 200, 0.1);
}

.footer__name {
  font-family: var(--font-display);
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--bone-100);
}

.footer__line {
  max-width: 30ch;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mineral-300);
}

.footer__version {
  margin-top: 10px;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--moss-500);
}

.footer__nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.footer__col-title {
  margin-bottom: 14px;
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--clay-500);
}

.footer__list { display: grid; gap: 10px; }

.footer__list a {
  font-size: 0.95rem;
  color: var(--bone-100);
  opacity: 0.82;
  transition: opacity 0.18s var(--ease), color 0.18s var(--ease);
}
.footer__list a:hover { opacity: 1; color: var(--neon-400); }

.footer__contact-list {
  display: grid;
  gap: 12px;
  margin-bottom: 20px;
}

.footer__contact-item {
  display: grid;
  grid-template-columns: 3.2em minmax(0, 1fr);
  gap: 10px;
  font-size: 0.88rem;
  line-height: 1.65;
}

.footer__key {
  padding-top: 0.15em;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--moss-500);
}

.footer__value {
  color: var(--bone-100);
  overflow-wrap: anywhere;
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  margin-top: clamp(32px, 5vw, 64px);
  padding-top: 20px;
  border-top: 1px solid var(--slate-700);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 0.82rem;
}

.footer__legal-link {
  color: var(--mineral-300);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.footer__legal-link:hover {
  color: var(--neon-400);
  border-bottom-color: rgba(76, 245, 200, 0.5);
}

.footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 0.74rem;
  color: var(--moss-500);
}

.footer__totop {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.5em 1em;
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-pill);
  color: var(--mineral-300);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.footer__totop:hover { color: var(--neon-400); border-color: var(--moss-500); }

.footer__totop-icon { font-family: var(--font-num); }

/* ---------- 16. 可选章节淡入 ---------- */
html[data-reveal-ready] [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

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

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1023px) {
  .grid--collage { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }

  .footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer__contact { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  body { font-size: 0.96rem; }

  .grid--collage { grid-template-columns: minmax(0, 1fr); }
  .media { border-radius: var(--radius-md); }
  .media--wide { aspect-ratio: 16 / 9; }

  .footer__inner { grid-template-columns: minmax(0, 1fr); }
  .footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__meta { margin-left: 0; }
  .footer__totop { order: -1; }
}

@media (min-width: 1024px) {
  :root { --rail-w: 88px; }

  .mobile-bar,
  .drawer { display: none; }

  .track {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 120;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    width: var(--rail-w);
    padding: 22px 0 18px;
    overflow-y: auto;
    background: linear-gradient(180deg, var(--pitch-950) 0%, var(--ink-900) 72%);
    border-right: 1px solid var(--slate-700);
    scrollbar-width: none;
  }
  .track::-webkit-scrollbar { display: none; }

  .scroll-progress {
    top: 0;
    bottom: 0;
    left: var(--rail-w);
    right: auto;
    width: 2px;
    height: auto;
  }
  .scroll-progress__bar {
    transform: scaleY(var(--sp, 0));
    transform-origin: 50% 0;
    background: linear-gradient(180deg, var(--neon-400), var(--amber-400));
  }
}

@media (min-width: 1024px) and (max-height: 760px) {
  .track { gap: 10px; padding-block: 14px; }
  .track .nav-link { padding: 5px 0; }
  .track__utility { gap: 10px; }
}

@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;
  }

  .live-dot {
    animation: none;
    box-shadow: 0 0 0 3px rgba(255, 162, 76, 0.22);
  }
}