/* =========================================================
   YT赛场 · 共享站点样式  /assets/site.css
   深夜赛场 × 数据仪表盘：墨绿基底 / 荧光青数据 / 暖金版本
   ========================================================= */

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

html {
  background: #061410;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 148px;
}

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

ul, ol { padding: 0; list-style: none; }
img, picture, svg, video { display: block; max-width: 100%; }
button { border: 0; background: none; font: inherit; color: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { width: 100%; border-collapse: collapse; }
[hidden] { display: none !important; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink: #061410;
  --panel: #0E2A22;
  --panel-2: #16382D;
  --cyan: #2FF3D0;
  --cyan-soft: #A6FFEE;
  --gold: #E8B94A;
  --orange: #FF6B3D;
  --charcoal: #161A18;
  --paper: #F1F7F3;
  --muted: #8EA79D;

  --line: rgba(47, 243, 208, 0.16);
  --line-soft: rgba(142, 167, 157, 0.16);
  --line-gold: rgba(232, 185, 74, 0.36);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system,
    "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular,
    Menlo, Consolas, "Courier New", monospace;

  --fs-xxl: clamp(2.4rem, 6.2vw, 3.5rem);
  --fs-xl: clamp(1.9rem, 4.4vw, 2.5rem);
  --fs-lg: clamp(1.45rem, 2.8vw, 1.75rem);
  --fs-md: 1.25rem;
  --fs-base: 1rem;
  --fs-sm: 0.8125rem;
  --fs-mono: 0.75rem;

  --shell: 1240px;
  --gutter: clamp(16px, 4vw, 32px);
  --cut: 14px;
  --ease: cubic-bezier(0.22, 0.68, 0.32, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  overflow-x: hidden;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* 深夜赛场网格：贴底不干扰内容的坐标底纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(142, 167, 157, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(142, 167, 157, 0.055) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 74%);
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 74%);
}

h1, h2, h3, h4 {
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.18;
}

h1 { font-size: var(--fs-xxl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-md); letter-spacing: -0.015em; }

p { max-width: 68ch; }
strong { font-weight: 700; color: var(--paper); }

::selection { background: var(--cyan); color: #04120E; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 4. 通用排版与容器 ---------- */
.shell {
  width: min(var(--shell), 100% - calc(var(--gutter) * 2));
  margin-inline: auto;
}

.page-main { display: block; }

.mono,
.index-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.index-num {
  display: inline-block;
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.prose { max-width: 68ch; }
.prose p + p { margin-top: 1em; }
.prose a { color: var(--cyan-soft); border-bottom: 1px solid rgba(47, 243, 208, 0.4); }
.prose a:hover { color: var(--cyan); }

.lede {
  max-width: 60ch;
  font-size: 1.125rem;
  color: var(--cyan-soft);
  line-height: 1.85;
}

.section {
  position: relative;
  padding: clamp(56px, 8vw, 96px) 0;
}

.section--tight { padding: clamp(28px, 4vw, 48px) 0; }

.section--panel {
  background: linear-gradient(180deg, var(--panel) 0%, rgba(14, 42, 34, 0.55) 100%);
  border-block: 1px solid var(--line-soft);
}

.section__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.section__index {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.16em;
  color: var(--gold);
}

.section__title { font-size: var(--fs-xl); }
.section__lead { max-width: 68ch; color: var(--muted); }

/* ---------- 5. 刻度尺与斜线装饰 ---------- */
.tick-rule {
  height: 12px;
  width: 100%;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, rgba(142, 167, 157, 0.42) 0 1px, transparent 1px 16px),
    repeating-linear-gradient(to right, rgba(47, 243, 208, 0.4) 0 1px, transparent 1px 96px);
  background-repeat: no-repeat;
  background-size: 100% 6px, 100% 12px;
  background-position: left bottom, left bottom;
}

.tick-rule--footer {
  height: 14px;
  background-image:
    repeating-linear-gradient(to right, rgba(142, 167, 157, 0.34) 0 1px, transparent 1px 16px),
    repeating-linear-gradient(to right, rgba(232, 185, 74, 0.5) 0 1px, transparent 1px 128px);
  background-size: 100% 6px, 100% 14px;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--paper);
  background: rgba(47, 243, 208, 0.06);
  border: 1px solid var(--line);
  clip-path: polygon(
    var(--cut) 0, 100% 0,
    100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%,
    0 100%, 0 var(--cut)
  );
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease),
    border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.btn:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan-soft);
}

.btn--primary {
  color: #04120E;
  background: var(--cyan);
  border-color: var(--cyan);
}

.btn--primary:hover { background: var(--cyan-soft); border-color: var(--cyan-soft); }

.btn--ghost {
  color: var(--cyan-soft);
  background: rgba(47, 243, 208, 0.06);
  border-color: rgba(47, 243, 208, 0.42);
}

.btn--ghost:hover {
  color: #FFFFFF;
  background: rgba(47, 243, 208, 0.16);
  border-color: var(--cyan);
}

.btn--line {
  color: var(--gold);
  background: rgba(232, 185, 74, 0.07);
  border-color: var(--line-gold);
}

.btn--line:hover { color: #FFF3D6; background: rgba(232, 185, 74, 0.16); }

/* ---------- 7. 面包屑 / 标签 / 面板 / 数据 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.crumbs__item { color: var(--muted); }
a.crumbs__item:hover { color: var(--cyan-soft); }
.crumbs__item[aria-current="page"] { color: var(--cyan); }
.crumbs__sep { color: rgba(142, 167, 157, 0.5); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
  background: rgba(47, 243, 208, 0.07);
  border: 1px solid rgba(47, 243, 208, 0.34);
  clip-path: polygon(
    6px 0, 100% 0,
    100% calc(100% - 6px), calc(100% - 6px) 100%,
    0 100%, 0 6px
  );
}

.tag--gold {
  color: var(--gold);
  background: rgba(232, 185, 74, 0.09);
  border-color: rgba(232, 185, 74, 0.42);
}

.tag--muted {
  color: var(--muted);
  background: transparent;
  border-color: rgba(142, 167, 157, 0.32);
}

.panel {
  padding: clamp(20px, 3vw, 30px);
  background: var(--panel);
  border: 1px solid var(--line-soft);
  clip-path: polygon(
    18px 0, 100% 0,
    100% calc(100% - 18px), calc(100% - 18px) 100%,
    0 100%, 0 18px
  );
}

.panel--hover { transition: background-color 0.24s var(--ease); }
.panel--hover:hover { background: var(--panel-2); }

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.panel__body { color: var(--paper); }

.stat { display: grid; gap: 6px; }

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5.4vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.stat__label {
  font-size: var(--fs-sm);
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ---------- 8. 栅格 ---------- */
.grid { display: grid; gap: clamp(18px, 3vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--aside { grid-template-columns: minmax(0, 1fr) 280px; gap: clamp(28px, 4vw, 56px); }

/* ---------- 9. 图片容器（页面阶段放置图片） ---------- */
.media { position: relative; display: block; }

.media__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(135deg, rgba(47, 243, 208, 0.12), rgba(255, 107, 61, 0.07) 58%, transparent 100%),
    var(--charcoal);
  clip-path: polygon(
    20px 0, 100% 0,
    100% calc(100% - 20px), calc(100% - 20px) 100%,
    0 100%, 0 20px
  );
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.04);
}

.media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.04em;
  color: var(--muted);
}

.media__overlay {
  position: absolute;
  inset: auto 0 0 0;
  padding: clamp(16px, 3vw, 28px);
  background: linear-gradient(180deg, transparent, rgba(6, 20, 16, 0.94));
}

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

.media--bleed {
  margin-inline: calc(50% - 50vw);
  width: 100vw;
}

/* ---------- 10. 进入动效 ---------- */
.reveal { transition: opacity 0.3s var(--ease), transform 0.32s var(--ease); }
.js-reveal .reveal { opacity: 0; transform: translate3d(-8px, 8px, 0); }
.js-reveal .reveal--in { opacity: 1; transform: none; }

/* ---------- 11. 章节索引轨 ---------- */
.index-rail {
  position: fixed;
  left: 20px;
  top: 50%;
  z-index: 40;
  display: none;
  flex-direction: column;
  gap: 10px;
  transform: translateY(-50%);
}

.index-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 2px 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  transition: color 0.2s var(--ease);
}

.index-rail__link::before {
  content: "";
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: width 0.22s var(--ease);
}

.index-rail__link:hover { color: var(--cyan-soft); }
.index-rail__link[aria-current="true"] { color: var(--cyan); }
.index-rail__link[aria-current="true"]::before { width: 30px; background: var(--cyan); }

/* ---------- 12. 版本对照 ---------- */
.compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.compare__col { padding: clamp(18px, 3vw, 28px); background: var(--ink); }
.compare__col:first-child { border-top: 2px solid var(--muted); }
.compare__col:last-child { border-top: 2px solid var(--cyan); background: var(--panel); }

.compare__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  color: var(--muted);
}

.compare__col:last-child .compare__title { color: var(--cyan); }

/* ---------- 13. 头部 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -64px;
  z-index: 200;
  padding: 10px 16px;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: #04120E;
  background: var(--cyan);
  transition: top 0.2s var(--ease);
}

.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 20, 16, 0.94);
  border-bottom: 1px solid var(--line-soft);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

/* 状态条 */
.status-strip {
  background: var(--charcoal);
  border-bottom: 1px solid rgba(232, 185, 74, 0.22);
}

.status-strip[data-state="synced"] { border-bottom-color: rgba(47, 243, 208, 0.32); }

.status-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 4px 18px;
  width: min(var(--shell), 100% - calc(var(--gutter) * 2));
  margin-inline: auto;
  min-height: 34px;
  padding: 5px 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.status-strip__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  white-space: nowrap;
}

.status-strip__item--right { margin-left: auto; }

.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--gold);
  transform: rotate(45deg);
  transition: background-color 0.24s var(--ease);
}

.status-strip[data-state="synced"] .status-dot { background: var(--cyan); }

.status-strip__label { color: var(--muted); }

.status-strip__value {
  color: var(--gold);
  font-variant-numeric: tabular-nums;
  transition: color 0.24s var(--ease);
}

.status-strip[data-state="synced"] .status-strip__value { color: var(--cyan); }

.status-strip__state {
  padding: 1px 8px;
  color: var(--gold);
  border: 1px solid var(--line-gold);
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.status-strip[data-state="synced"] .status-strip__state {
  color: var(--cyan);
  border-color: rgba(47, 243, 208, 0.45);
}

/* 主条 */
.header-bar {
  background: linear-gradient(180deg, rgba(14, 42, 34, 0.8), rgba(6, 20, 16, 0.9));
}

.header-bar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  width: min(var(--shell), 100% - calc(var(--gutter) * 2));
  margin-inline: auto;
  padding: 12px 0 14px;
}

/* 品牌柱 */
.brand-block {
  order: 1;
  display: grid;
  grid-template-columns: auto auto;
  align-items: center;
  gap: 0 10px;
  padding-right: 20px;
  border-right: 1px solid var(--line);
}

.brand-block__link {
  grid-column: 1;
  grid-row: 1;
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
}

.brand-block__mark {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--cyan);
}

.brand-block__name {
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.brand-block__meta {
  grid-column: 2;
  grid-row: 1;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.brand-block__version {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  color: var(--muted);
}

.brand-block__badge {
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--gold);
  background: rgba(232, 185, 74, 0.14);
  border: 1px solid var(--line-gold);
  clip-path: polygon(5px 0, 100% 0, 100% calc(100% - 5px), calc(100% - 5px) 100%, 0 100%, 0 5px);
}

.brand-block__note {
  grid-column: 1 / -1;
  grid-row: 2;
  margin-top: 3px;
  max-width: 30ch;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--muted);
}

/* 导航 */
.main-nav {
  order: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 16px;
  margin-left: auto;
}

.nav-group {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-group--alt {
  padding-left: 16px;
  margin-left: 4px;
  border-left: 1px solid var(--line);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 10px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--paper);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.nav-link__index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  transition: color 0.2s var(--ease);
}

.nav-link:hover { color: var(--cyan-soft); background: rgba(47, 243, 208, 0.06); }
.nav-link:hover .nav-link__index { color: var(--cyan); }

.nav-link[aria-current="page"] { color: var(--cyan); }

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 2px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(47, 243, 208, 0));
}

.nav-link[aria-current="page"] .nav-link__index { color: var(--gold); }

/* 行动按钮组 */
.header-actions {
  order: 3;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 移动端抽屉按钮 */
.nav-toggle {
  order: 4;
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  font-size: var(--fs-mono);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
  background: rgba(47, 243, 208, 0.08);
  border: 1px solid rgba(47, 243, 208, 0.4);
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
}

.nav-toggle:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars > span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.22s var(--ease), width 0.22s var(--ease);
}

.nav-toggle__bars > span:nth-child(2) { width: 70%; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(2) { width: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* 阅读进度 */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(142, 167, 157, 0.14);
}

.read-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--gold));
  transition: width 0.14s linear;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 112px);
  background: linear-gradient(180deg, var(--charcoal) 0%, #0A0E0C 100%);
  border-top: 1px solid var(--line-soft);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(360px, 42vw);
  height: 5px;
  background: linear-gradient(90deg, transparent, var(--orange));
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 160px;
  height: 160px;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(47, 243, 208, 0.1), transparent 68%);
  clip-path: polygon(0 0, 100% 0, 0 100%);
}

.footer-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.2fr 2fr 1.2fr;
  gap: clamp(28px, 4vw, 52px);
  width: min(var(--shell), 100% - calc(var(--gutter) * 2));
  margin-inline: auto;
  padding: clamp(40px, 6vw, 64px) 0 clamp(28px, 4vw, 44px);
}

.footer-brand__name {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.footer-brand__version {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.1em;
  color: var(--gold);
}

.footer-brand__state {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.04em;
  color: var(--cyan-soft);
}

.footer-brand__note {
  margin-top: 14px;
  max-width: 28ch;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--muted);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px 32px;
}

.footer-col__title {
  padding-bottom: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border-bottom: 1px solid var(--line);
}

.footer-col__list { display: grid; gap: 8px; }

.footer-link {
  display: inline-block;
  padding: 2px 0;
  font-size: 0.875rem;
  color: var(--paper);
  opacity: 0.84;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), opacity 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.footer-link:hover {
  color: var(--cyan-soft);
  opacity: 1;
  border-bottom-color: rgba(47, 243, 208, 0.5);
}

.footer-contact__list {
  display: grid;
  gap: 12px;
  font-size: var(--fs-sm);
  color: var(--paper);
}

.footer-contact__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.footer-contact__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  letter-spacing: 0.01em;
  color: var(--cyan-soft);
  word-break: break-word;
}

.footer-contact__note {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 0.75rem;
  line-height: 1.75;
  color: var(--muted);
}

.footer-legal { border-top: 1px solid var(--line-soft); }

.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  width: min(var(--shell), 100% - calc(var(--gutter) * 2));
  margin-inline: auto;
  padding: 16px 0 22px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.05em;
  color: var(--muted);
}

.footer-legal__icp { color: var(--muted); }
.footer-legal__version { color: var(--gold); }
.footer-legal__copy { color: var(--muted); text-align: right; }

/* ---------- 15. 响应式 ---------- */
@media (min-width: 1280px) {
  .index-rail { display: flex; }
}

@media (max-width: 1180px) {
  .header-bar__inner { gap: 10px 16px; }
  .brand-block { padding-right: 16px; }
  .brand-block__note { display: none; }
  .main-nav {
    order: 6;
    flex-basis: 100%;
    margin-left: 0;
    padding-top: 10px;
    border-top: 1px solid var(--line-soft);
  }
  .header-actions { order: 5; margin-left: auto; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

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

@media (max-width: 760px) {
  html { scroll-padding-top: 120px; }

  .nav-toggle { display: inline-flex; order: 4; margin-left: auto; }

  .header-actions {
    order: 5;
    flex-basis: 100%;
    margin-left: 0;
  }

  .header-actions .btn { flex: 1 1 auto; padding: 10px 12px; }

  .main-nav {
    order: 6;
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 10px;
    border-top: 1px solid var(--line-soft);
  }

  .main-nav[data-open] { display: flex; }

  .nav-group {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-group--alt {
    padding-left: 0;
    margin-left: 0;
    padding-top: 6px;
    margin-top: 6px;
    border-left: 0;
    border-top: 1px solid var(--line-soft);
  }

  .nav-link {
    justify-content: flex-start;
    padding: 12px 4px;
    font-size: 0.9375rem;
    border-bottom: 1px solid rgba(142, 167, 157, 0.12);
  }

  .nav-link[aria-current="page"]::after {
    left: 4px;
    right: auto;
    width: 26px;
    bottom: 7px;
  }

  .status-strip__item { white-space: normal; }
  .status-strip__item--right { margin-left: 0; }

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

  .footer-nav { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .footer-legal__copy { text-align: left; }
  .media--bleed { margin-inline: 0; width: 100%; }
}

@media (max-width: 480px) {
  .brand-block__mark,
  .brand-block__name { font-size: 1.25rem; }
  .brand-block { padding-right: 12px; }
  .status-strip__inner { font-size: 0.6875rem; }
}

/* ---------- 16. 无障碍偏好 ---------- */
@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;
  }

  .js-reveal .reveal { opacity: 1; transform: none; }
  .nav-toggle__bars > span { transition: none; }
}