/* ==========================================================================
   买球平台中文官方站 · 共享样式 /assets/site.css
   夜间控制台式：深靛蓝基底 + 信号橙 / 荧光青状态色
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; }
main { display: block; }

/* ---------- 2. 变量 ---------- */
:root {
  --c-indigo: #0B1B3A;
  --c-indigo-deep: #081428;
  --c-charcoal: #1E2530;
  --c-charcoal-2: #161D2A;
  --c-mist: #7C8CA6;
  --c-fog: #D7DEE8;
  --c-orange: #FF6B35;
  --c-cyan: #2DE2E6;
  --c-amber: #FFB347;
  --c-mint: #3DDC97;
  --c-rose: #FF4D6D;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-strong: rgba(255, 255, 255, 0.14);
  --line: rgba(124, 140, 166, 0.26);
  --line-strong: rgba(124, 140, 166, 0.45);

  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-narrow: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", "SimSun", Georgia, serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;

  --step-12: 12px;
  --step-14: 14px;
  --step-16: 16px;
  --step-20: 20px;
  --step-28: 28px;
  --step-40: 40px;
  --step-64: 64px;

  --rail-w: 280px;
  --bar-h: 64px;
  --page-max: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;
  --shadow-1: 0 10px 30px rgba(3, 8, 20, 0.45);
  --shadow-2: 0 22px 60px rgba(3, 8, 20, 0.55);

  --t-fast: 180ms;
  --t-base: 240ms;
  --t-slow: 280ms;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基底与中文排版 ---------- */
html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background-color: var(--c-indigo);
  background-image:
    radial-gradient(1100px 620px at 92% -8%, rgba(45, 226, 230, 0.11), transparent 62%),
    radial-gradient(880px 560px at -12% 18%, rgba(255, 107, 53, 0.10), transparent 60%),
    linear-gradient(180deg, #0C1E40 0%, var(--c-indigo) 44%, var(--c-indigo-deep) 100%);
  background-repeat: no-repeat;
  color: var(--c-fog);
  font-family: var(--font-sans);
  font-size: var(--step-16);
  line-height: 1.7;
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); background-attachment: fixed; }
}
@media (max-width: 1023.98px) {
  body { padding-top: var(--bar-h); }
  body.is-nav-open { overflow: hidden; }
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-narrow);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: 0.005em;
  color: #F2F6FB;
}
h1 { font-size: clamp(30px, 5vw, 64px); letter-spacing: -0.008em; }
h2 { font-size: clamp(24px, 3.4vw, 40px); }
h3 { font-size: clamp(18px, 2.2vw, 28px); }
h4 { font-size: var(--step-20); }

p { line-height: 1.7; }

::selection { background: rgba(255, 107, 53, 0.34); color: #FFFFFF; }

:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  margin: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  background: var(--c-cyan);
  color: #04231F;
  font-size: var(--step-14);
  font-weight: 700;
  letter-spacing: 0.04em;
  transform: translateY(-160%);
  transition: transform var(--t-fast) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

#main-content { scroll-margin-top: 80px; }

/* ---------- 5. 品牌标识 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.brand__mark {
  position: relative;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--c-cyan), #123056 52%, var(--c-orange));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.16);
}
.brand__mark::after {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 4px;
  background: rgba(8, 20, 40, 0.88);
  box-shadow: inset 0 0 0 1px rgba(215, 222, 232, 0.55);
}
.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__name {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: 15px;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: #F2F6FB;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.14em;
  color: var(--c-mist);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
@media (max-width: 399px) {
  .brand__tag { display: none; }
}

/* ---------- 6. 头部：移动端顶栏 + 抽屉 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--bar-h);
  z-index: 60;
  background: rgba(11, 27, 58, 0.94);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 100%;
  padding: 0 clamp(14px, 4vw, 24px);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--glass);
  color: var(--c-fog);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: rgba(45, 226, 230, 0.5); }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
  height: 14px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--c-cyan);
  transition: transform var(--t-base) var(--ease), opacity var(--t-fast) linear, background var(--t-fast) linear;
}
.nav-toggle__bars span:nth-child(1) { width: 100%; }
.nav-toggle__bars span:nth-child(2) { width: 68%; }
.nav-toggle__bars span:nth-child(3) { width: 100%; }
.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
}
.site-header[data-open] .nav-toggle {
  border-color: rgba(255, 107, 53, 0.55);
  background: rgba(255, 107, 53, 0.14);
  color: #FFFFFF;
}
.site-header[data-open] .nav-toggle__bars span { width: 100%; background: var(--c-orange); }
.site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 抽屉 */
.site-nav {
  position: fixed;
  top: var(--bar-h);
  left: 0;
  bottom: 0;
  width: min(86vw, 340px);
  z-index: 62;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 22px clamp(16px, 5vw, 24px) 28px;
  background: linear-gradient(170deg, #101F3F 0%, var(--c-indigo) 55%, var(--c-indigo-deep) 100%);
  border-right: 1px solid var(--line-strong);
  box-shadow: var(--shadow-2);
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateX(-102%);
  transition: transform var(--t-slow) var(--ease);
}
.site-header[data-open] .site-nav { transform: translateX(0); }

.site-nav__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-mist);
}
.site-nav__list { display: flex; flex-direction: column; gap: 2px; }
.site-nav__item { min-width: 0; }
.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  color: var(--c-mist);
  font-size: var(--step-14);
  letter-spacing: 0.06em;
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.site-nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 20px;
  border-radius: 2px;
  background: var(--c-orange);
  opacity: 0;
  transform: translateY(-50%) scaleY(0.25);
  transition: opacity var(--t-fast) linear, transform var(--t-base) var(--ease);
}
.site-nav__link:hover {
  color: var(--c-fog);
  background: var(--glass);
  border-color: var(--line);
}
.site-nav__link:hover::before { opacity: 0.55; transform: translateY(-50%) scaleY(1); }
.site-nav__link[aria-current="page"] {
  color: #FFFFFF;
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.20), rgba(255, 107, 53, 0.02));
  border-color: rgba(255, 107, 53, 0.45);
}
.site-nav__link[aria-current="page"]::before { opacity: 1; transform: translateY(-50%) scaleY(1); }
.site-nav__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
  min-width: 20px;
}
.site-nav__link[aria-current="page"] .site-nav__num { color: var(--c-orange); }
.site-nav__text { white-space: nowrap; }

.rail-actions {
  display: grid;
  gap: 8px;
  margin-top: auto;
}
.rail-actions .btn { width: 100%; }

.rail-status {
  display: flex;
  align-items: center;
  gap: 9px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}
.rail-status__dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-mint);
  box-shadow: 0 0 0 3px rgba(61, 220, 151, 0.14);
  animation: railPulse 2.6s ease-in-out infinite;
}
@keyframes railPulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(61, 220, 151, 0.14); }
  50% { box-shadow: 0 0 0 7px rgba(61, 220, 151, 0.04); }
}

/* 遮罩 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 61;
  background: rgba(4, 10, 24, 0.72);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-base) var(--ease), visibility var(--t-base) linear;
}
.site-header[data-open] .nav-scrim { opacity: 1; visibility: visible; }

/* 阅读进度 */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 70;
  background: rgba(124, 140, 166, 0.16);
  pointer-events: none;
}
.read-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-orange), var(--c-amber) 42%, var(--c-cyan));
  transition: transform 120ms linear;
}

/* 桌面端：固定索引轴 */
@media (min-width: 1024px) {
  .site-header {
    top: 0;
    left: 0;
    bottom: 0;
    right: auto;
    width: var(--rail-w);
    height: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 26px 20px 22px;
    background: linear-gradient(180deg, #101F3F 0%, var(--c-indigo) 46%, var(--c-indigo-deep) 100%);
    border-bottom: 0;
    border-right: 1px solid var(--line);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
  .site-header__bar { display: block; height: auto; padding: 0; }
  .nav-toggle { display: none; }
  .nav-scrim { display: none; }
  .site-nav {
    position: static;
    transform: none;
    width: auto;
    min-height: 0;
    flex: 1;
    padding: 0;
    gap: 16px;
    border: 0;
    box-shadow: none;
    background: none;
    overflow: visible;
  }
  .site-nav__link { padding: 11px 12px 11px 14px; }
  .rail-actions { margin-top: 4px; }
}

@media (min-width: 1024px) and (max-height: 720px) {
  .site-nav__list { overflow-y: auto; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: linear-gradient(180deg, rgba(30, 37, 48, 0.55) 0%, rgba(11, 27, 58, 0.96) 62%, var(--c-indigo-deep) 100%);
  border-top: 1px solid var(--line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 38%;
  height: 2px;
  background: linear-gradient(90deg, var(--c-orange), var(--c-cyan));
}
.site-footer__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: clamp(36px, 6vw, 64px) var(--gutter) clamp(20px, 3vw, 30px);
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .site-footer__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .site-footer__inner { grid-template-columns: 1.5fr 1fr 1fr 1.1fr; }
}
.site-footer__brand { display: flex; flex-direction: column; gap: 10px; }
.site-footer__note {
  font-size: 13px;
  line-height: 1.8;
  color: var(--c-mist);
  max-width: 36ch;
}
.site-footer__mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--c-fog);
}
.site-footer__addr {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
  max-width: 30ch;
}
.site-footer__title {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-mist);
  margin-bottom: 14px;
}
.site-footer__list { display: flex; flex-direction: column; gap: 10px; }
.site-footer__list li { font-size: var(--step-14); line-height: 1.6; }
.site-footer__list a {
  color: rgba(215, 222, 232, 0.82);
  transition: color var(--t-fast) linear, padding-left var(--t-fast) var(--ease);
}
.site-footer__list a:hover { color: var(--c-cyan); padding-left: 4px; }
.site-footer__list--plain li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-mist);
}
.site-footer__bottom {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 18px var(--gutter) 34px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}
.site-footer__icp {
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--glass);
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: var(--step-14);
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.4;
  transition: transform var(--t-fast) var(--ease), background var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--c-orange); color: #1A0C05; }
.btn--primary:hover { background: #FF8355; }
.btn--cyan { background: var(--c-cyan); color: #04231F; }
.btn--cyan:hover { background: #6AEEF0; }
.btn--ghost {
  background: var(--glass);
  border-color: var(--line);
  color: var(--c-fog);
}
.btn--ghost:hover { border-color: rgba(45, 226, 230, 0.5); color: #FFFFFF; }
.btn--block { width: 100%; }

/* ---------- 9. 路径导航 ---------- */
.breadcrumbs {
  padding-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-mist);
}
.breadcrumbs__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumbs__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs__link { color: var(--c-mist); transition: color var(--t-fast) linear; }
.breadcrumbs__link:hover { color: var(--c-cyan); }
.breadcrumbs__sep { color: var(--line-strong); }
.breadcrumbs__item[aria-current="page"] { color: var(--c-fog); }

/* ---------- 10. 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.wrap--wide { max-width: 1400px; }
.section { padding: clamp(40px, 6vw, 84px) 0; }
.section--tight { padding: clamp(24px, 3.5vw, 44px) 0; }
.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(20px, 3vw, 36px);
}
.stack { display: flex; flex-direction: column; gap: clamp(12px, 2vw, 20px); }

.grid { display: grid; gap: clamp(14px, 2vw, 24px); grid-template-columns: 1fr; }
@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 960px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.bento { display: grid; gap: clamp(12px, 1.6vw, 18px); grid-template-columns: 1fr; }
@media (min-width: 720px) {
  .bento { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1080px) {
  .bento { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .bento__cell { grid-column: span 2; }
  .bento__cell--wide { grid-column: span 3; }
  .bento__cell--full { grid-column: span 6; }
  .bento__cell--tall { grid-row: span 2; }
}

/* ---------- 11. 内容层 ---------- */
.panel {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  padding: clamp(16px, 2.4vw, 26px);
}
.card {
  background: linear-gradient(180deg, var(--c-charcoal) 0%, var(--c-charcoal-2) 100%);
  border: 1px solid rgba(124, 140, 166, 0.18);
  border-radius: var(--radius-md);
  padding: clamp(16px, 2.4vw, 26px);
}
.card--accent { box-shadow: inset 3px 0 0 var(--c-orange); }

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--line), transparent 70%);
}

/* ---------- 12. 文字元件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-cyan);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}
.section-title {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 38px);
  line-height: 1.24;
  color: #EAF0F8;
}
.lede { font-size: clamp(16px, 1.9vw, 20px); line-height: 1.75; color: var(--c-fog); }
.serif { font-family: var(--font-serif); font-weight: 400; letter-spacing: 0.01em; }
.mono { font-family: var(--font-mono); letter-spacing: 0.02em; }
.note { font-size: 13px; line-height: 1.7; color: var(--c-mist); }

.prose {
  max-width: 68ch;
  font-size: var(--step-16);
  line-height: 1.85;
  color: var(--c-fog);
}
.prose > * + * { margin-top: 1em; }
.prose h2 { margin-top: 1.7em; }
.prose h3 { margin-top: 1.4em; }
.prose ul, .prose ol { display: flex; flex-direction: column; gap: 0.5em; }
.prose li { position: relative; padding-left: 18px; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-cyan);
}
.prose a { color: var(--c-cyan); border-bottom: 1px solid rgba(45, 226, 230, 0.4); }
.prose strong { color: #FFFFFF; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--line);
  background: var(--glass);
}

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

/* ---------- 13. 状态标签与数据 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  background: var(--glass);
  color: var(--c-fog);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.6;
}
.tag--ok { color: var(--c-mint); border-color: rgba(61, 220, 151, 0.45); background: rgba(61, 220, 151, 0.10); }
.tag--warn { color: var(--c-amber); border-color: rgba(255, 179, 71, 0.45); background: rgba(255, 179, 71, 0.10); }
.tag--err { color: var(--c-rose); border-color: rgba(255, 77, 109, 0.45); background: rgba(255, 77, 109, 0.10); }
.tag--info { color: var(--c-cyan); border-color: rgba(45, 226, 230, 0.45); background: rgba(45, 226, 230, 0.10); }

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 40px);
  line-height: 1.1;
  color: #FFFFFF;
}
.stat__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-mist);
}

/* ---------- 14. 编号轨道 ---------- */
.track { display: flex; flex-direction: column; }
.track__item {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 14px 0;
}
.track__item::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line), transparent);
}
.track__index {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--c-charcoal);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-cyan);
}

/* ---------- 15. 图像容器（页面阶段复用） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  isolation: isolate;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(140deg, rgba(45, 226, 230, 0.14), rgba(11, 27, 58, 0.92) 52%, rgba(255, 107, 53, 0.14));
}
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--3x4 { aspect-ratio: 3 / 4; }
.media--21x9 { aspect-ratio: 21 / 9; }
.media__img { width: 100%; height: 100%; object-fit: cover; }
.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-fog);
  background: linear-gradient(0deg, rgba(8, 20, 40, 0.94), rgba(8, 20, 40, 0));
}
.media--grid::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    linear-gradient(rgba(124, 140, 166, 0.20) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 140, 166, 0.20) 1px, transparent 1px);
  background-size: 26px 26px;
}
.media--tag { position: absolute; top: 12px; left: 12px; z-index: 2; }

/* ---------- 16. 滚动章节与显现协议 ---------- */
[data-section] { scroll-margin-top: 88px; }
[data-section] .eyebrow { transition: color var(--t-base) var(--ease); }
[data-section].is-current .eyebrow { color: var(--c-orange); }

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
}
html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  transition:
    opacity var(--t-slow) var(--ease) var(--reveal-delay, 0ms),
    transform var(--t-slow) var(--ease) var(--reveal-delay, 0ms);
}

/* ---------- 17. 无障碍与动效偏好 ---------- */
@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;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .rail-status__dot { animation: none; }
}

/* ---------- 18. 平板微调 ---------- */
@media (min-width: 768px) and (max-width: 1023.98px) {
  .site-header__bar { padding: 0 28px; }
  .site-nav { width: min(60vw, 380px); }
}