/* ============================================================
   风速体育 CN · /assets/site.css
   共享外壳：reset → 变量 → 中文排版 → 基础组件 → 页头 → 页脚
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--bar-h) + 12px);
}

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

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

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

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

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

hr { border: 0; border-top: 1px solid var(--c-grid); margin: 0; }

::selection { background: rgba(10, 132, 255, 0.35); color: var(--c-bright); }

/* ---------- 2. 变量 ---------- */
:root {
  --c-void: #06080C;
  --c-navy: #0E1520;
  --c-grid: #1E2A38;
  --c-text: #C7D2DE;
  --c-bright: #F4F8FF;
  --c-blue: #0A84FF;
  --c-blue-soft: #6FBDFF;
  --c-orange: #FF6B35;
  --c-orange-soft: #FFA37A;
  --c-live: #2BE07A;

  --font-display: Georgia, "Songti SC", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --rail-w: 96px;
  --bar-h: 64px;
  --container: 1280px;
  --gutter: clamp(20px, 4vw, 56px);
  --edge-cut: 14px;
  --ease-speed: cubic-bezier(0.2, 0.72, 0.2, 1);
}

/* ---------- 3. 中文排版基座 ---------- */
body {
  min-height: 100vh;
  background-color: var(--c-void);
  background-image:
    linear-gradient(180deg, rgba(10, 132, 255, 0.09), rgba(6, 8, 12, 0) 520px),
    repeating-linear-gradient(90deg, rgba(30, 42, 56, 0.5) 0 1px, transparent 1px 96px);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

p { max-width: 68ch; }

h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--c-bright);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.display,
.chapter__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--c-bright);
}

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

.muted { font-size: 14px; color: rgba(199, 210, 222, 0.72); }

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-blue-soft);
}

.kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  flex: none;
  background: var(--c-orange);
  transform: rotate(-8deg);
}

.rule {
  position: relative;
  height: 1px;
  margin: clamp(24px, 3vw, 40px) 0;
  background: var(--c-grid);
}

.rule::after {
  content: "";
  position: absolute;
  left: 0;
  top: -3px;
  width: 64px;
  height: 1px;
  background: var(--c-orange);
  transform: rotate(-8deg);
}

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

#main-content { display: block; min-height: 60vh; }

/* ---------- 4. 容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(56px, 8vw, 120px); }
.section--tight { padding-block: clamp(32px, 4vw, 56px); }

.chapter { position: relative; padding-block: clamp(48px, 7vw, 104px); }

.chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

.chapter__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--c-orange);
}

.chapter__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-blue-soft);
}

.chapter__lede { margin-top: 14px; max-width: 62ch; }

.grid {
  display: grid;
  gap: clamp(12px, 1.6vw, 22px);
  grid-template-columns: minmax(0, 1fr);
}

.grid__wide { grid-column: 1 / -1; }

@media (min-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- 5. 卡片 ---------- */
.card {
  --accent: var(--c-blue);
  position: relative;
  background: var(--c-navy);
  border: 1px solid var(--c-grid);
  padding: clamp(16px, 2vw, 24px);
  transition: border-color 200ms var(--ease-speed), transform 260ms var(--ease-speed), box-shadow 260ms var(--ease-speed);
}

.card::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 1px;
  width: var(--edge-cut);
  height: 1px;
  background: var(--accent);
  transform-origin: left center;
  transform: rotate(45deg);
}

.card:hover,
.card:focus-within {
  border-color: rgba(10, 132, 255, 0.45);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -18px rgba(0, 0, 0, 0.9);
}

.card--home { --accent: var(--c-blue); }
.card--away { --accent: var(--c-orange); }

.card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent);
  border: 1px solid currentColor;
  padding: 2px 6px;
}

.card__title { margin-block: 10px 6px; font-size: clamp(16px, 1.6vw, 19px); }
.card__meta { font-family: var(--font-mono); font-size: 12px; color: rgba(199, 210, 222, 0.75); }

/* ---------- 6. 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--c-blue);
  background: transparent;
  color: var(--c-bright);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: background-color 180ms var(--ease-speed), border-color 180ms var(--ease-speed),
    color 180ms var(--ease-speed), transform 180ms var(--ease-speed);
}

.btn:hover { background: rgba(10, 132, 255, 0.16); border-color: var(--c-blue-soft); transform: translateY(-1px); }

.btn--primary { background: var(--c-orange); border-color: var(--c-orange); color: #0A0C10; }
.btn--primary:hover { background: var(--c-orange-soft); border-color: var(--c-orange-soft); color: #0A0C10; }

.btn--ghost { border-color: var(--c-grid); color: var(--c-text); }
.btn--ghost:hover { border-color: var(--c-blue); color: var(--c-bright); background: transparent; }

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  border: 1px solid var(--c-grid);
  color: var(--c-text);
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.04em;
  transition: border-color 160ms var(--ease-speed), color 160ms var(--ease-speed), background-color 160ms var(--ease-speed);
}

.tag:hover { border-color: var(--c-blue-soft); color: var(--c-bright); }

.tag--active,
.tag[aria-pressed="true"] {
  border-color: var(--c-orange);
  background: rgba(255, 107, 53, 0.12);
  color: var(--c-bright);
}

/* ---------- 7. 图例、面包屑、折叠 ---------- */
.legend { display: flex; flex-wrap: wrap; gap: 10px 20px; }

.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--c-text);
}

.legend__icon {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
  border: 1px solid var(--c-blue);
}

.legend__icon::after { content: ""; position: absolute; inset: 3px; background: var(--c-blue); }

.legend__item--away .legend__icon { border-color: var(--c-orange); }
.legend__item--away .legend__icon::after { background: var(--c-orange); }

.legend__item--live .legend__icon { border-color: var(--c-live); border-radius: 50%; }
.legend__item--live .legend__icon::after { inset: 4px; border-radius: 50%; background: var(--c-live); }

.breadcrumb { padding-block: 14px; border-bottom: 1px solid var(--c-grid); }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(199, 210, 222, 0.7);
}

.breadcrumb__item + .breadcrumb__item::before { content: "／"; margin-inline: 8px; color: var(--c-grid); }

.breadcrumb__link:hover { color: var(--c-blue-soft); }
.breadcrumb__current { color: var(--c-bright); }

.fold { background: rgba(14, 21, 32, 0.6); border: 1px solid var(--c-grid); }
.fold + .fold { margin-top: 10px; }

.fold__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 48px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-bright);
}

.fold__summary::-webkit-details-marker { display: none; }

.fold__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--c-orange);
  transition: transform 200ms var(--ease-speed);
}

.fold[open] .fold__summary::after { content: "−"; }

.fold__body {
  padding: 14px 18px 18px;
  border-top: 1px solid var(--c-grid);
  font-size: 15px;
}

.fold__body > p + p { margin-top: 0.8em; }

/* ---------- 8. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--c-grid);
  background: linear-gradient(135deg, #0E1520 0%, #06080C 72%);
}

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

.media img {
  position: relative;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: repeating-linear-gradient(115deg, rgba(111, 189, 255, 0.1) 0 1px, transparent 1px 16px);
}

.media--home::after {
  background:
    linear-gradient(180deg, rgba(10, 132, 255, 0.3), rgba(6, 8, 12, 0.72) 78%),
    repeating-linear-gradient(115deg, rgba(111, 189, 255, 0.14) 0 1px, transparent 1px 16px);
}

.media--away::after {
  background:
    linear-gradient(180deg, rgba(255, 107, 53, 0.26), rgba(6, 8, 12, 0.72) 78%),
    repeating-linear-gradient(115deg, rgba(255, 163, 122, 0.14) 0 1px, transparent 1px 16px);
}

.media__orbits {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 2;
  height: 42%;
  pointer-events: none;
  background:
    radial-gradient(120% 100% at 12% 100%, rgba(10, 132, 255, 0.38), transparent 62%),
    radial-gradient(90% 100% at 88% 100%, rgba(255, 107, 53, 0.28), transparent 60%);
}

.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 3;
  max-width: 100%;
  padding: 10px 14px;
  border-top: 1px solid var(--c-grid);
  background: rgba(6, 8, 12, 0.82);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text);
}

/* ---------- 9. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 320ms var(--ease-speed), transform 420ms var(--ease-speed);
}

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

/* ---------- 10. 页头：跳过链接 + 左侧轨道 ---------- */
.skip-link {
  position: absolute;
  left: 8px;
  top: -72px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--c-blue);
  color: #FFFFFF;
  font-size: 14px;
  transition: top 160ms var(--ease-speed);
}

.skip-link:focus { top: 8px; }

.site-header { position: relative; z-index: 50; }

.rail { display: none; }

@media (min-width: 1024px) {
  .rail {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 60;
    width: var(--rail-w);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 18px 0 20px;
    background:
      linear-gradient(180deg, rgba(10, 132, 255, 0.16), rgba(10, 132, 255, 0) 46%),
      var(--c-void);
    border-right: 1px solid var(--c-grid);
  }
}

.rail__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.rail__brand-cn {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-bright);
}

.rail__brand-mark {
  padding: 2px 5px;
  border: 1px solid rgba(10, 132, 255, 0.5);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-blue);
}

.rail__live {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--c-text);
}

.rail__live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-live);
  box-shadow: 0 0 0 3px rgba(43, 224, 122, 0.16);
  animation: railPulse 2400ms var(--ease-speed) infinite;
}

@keyframes railPulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(43, 224, 122, 0.16); }
  50% { box-shadow: 0 0 0 6px rgba(43, 224, 122, 0.06); }
}

.rail__index {
  width: 100%;
  margin-top: auto;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.rail__index-item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 28px;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(199, 210, 222, 0.82);
  transition: color 180ms var(--ease-speed), background-color 180ms var(--ease-speed), border-color 180ms var(--ease-speed);
}

.rail__index-item:hover,
.rail__index-item:focus-visible {
  color: var(--c-bright);
  background: rgba(10, 132, 255, 0.14);
  border-left-color: var(--c-blue);
}

.rail__index-num { font-variant-numeric: tabular-nums; }

.rail__index-label {
  position: absolute;
  left: 100%;
  top: 50%;
  padding: 6px 10px;
  border: 1px solid var(--c-grid);
  border-left: 2px solid var(--c-blue);
  background: var(--c-navy);
  color: var(--c-bright);
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transform: translate(-6px, -50%);
  transition: opacity 160ms var(--ease-speed), transform 200ms var(--ease-speed);
}

.rail__index-item:hover .rail__index-label,
.rail__index-item:focus-visible .rail__index-label { opacity: 1; transform: translate(0, -50%); }

.rail__progress {
  position: relative;
  width: 2px;
  height: 80px;
  margin-top: 18px;
  background: var(--c-grid);
  overflow: hidden;
}

.rail__progress-bar {
  position: absolute;
  inset: 0;
  display: block;
  transform: scaleY(0);
  transform-origin: top center;
  background: linear-gradient(180deg, var(--c-blue), var(--c-live));
}

@media (min-width: 1024px) and (max-height: 640px) {
  .rail__progress { display: none; }
}

/* ---------- 11. 页头：顶部条 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 55;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  min-height: var(--bar-h);
  padding-inline: var(--gutter);
  background: rgba(6, 8, 12, 0.94);
  border-bottom: 1px solid var(--c-grid);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 220ms var(--ease-speed), background-color 220ms var(--ease-speed);
}

.site-header.is-scrolled .topbar {
  background: rgba(6, 8, 12, 0.99);
  border-bottom-color: rgba(10, 132, 255, 0.4);
}

.topbar__brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-bright);
}

.topbar__brand-name { white-space: nowrap; }

.topbar__brand-mark {
  padding: 1px 5px;
  border: 1px solid rgba(10, 132, 255, 0.5);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-blue);
}

.topbar__live {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--c-live);
}

.topbar__speedline {
  position: relative;
  flex: 1 1 auto;
  min-width: 20px;
  height: 1px;
  background: linear-gradient(90deg, rgba(30, 42, 56, 0) 0%, rgba(30, 42, 56, 1) 12%, rgba(255, 107, 53, 0.5) 64%, rgba(255, 107, 53, 0) 100%);
}

.topbar__speedline::after {
  content: "";
  position: absolute;
  right: 0;
  top: -4px;
  width: 34px;
  height: 1px;
  background: var(--c-orange);
  transform: rotate(-8deg);
  transform-origin: right center;
  transition: width 180ms var(--ease-speed);
}

.topbar:hover .topbar__speedline::after { width: 74px; }

.topbar__utility { display: none; align-items: center; gap: 16px; flex: none; }

@media (min-width: 1024px) {
  .topbar__utility { display: flex; }
}

.utility__locale {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(199, 210, 222, 0.82);
}

.utility__link {
  padding-bottom: 2px;
  border-bottom: 1px solid var(--c-grid);
  font-size: 12px;
  color: var(--c-text);
  transition: color 160ms var(--ease-speed), border-color 160ms var(--ease-speed);
}

.utility__link:hover { color: var(--c-blue-soft); border-bottom-color: var(--c-orange); }

.nav-toggle {
  position: relative;
  z-index: 56;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  min-width: 44px;
  padding: 0 12px;
  flex: none;
  border: 1px solid var(--c-grid);
  background: rgba(14, 21, 32, 0.6);
  color: var(--c-bright);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: border-color 180ms var(--ease-speed), color 180ms var(--ease-speed);
}

.nav-toggle:hover { border-color: var(--c-blue); }
.nav-toggle[aria-expanded="true"] { border-color: var(--c-orange); color: var(--c-orange-soft); }

@media (min-width: 1024px) {
  .nav-toggle { display: none; }
}

.nav-toggle__bar {
  position: relative;
  width: 16px;
  height: 1px;
  flex: none;
  background: currentColor;
}

.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1px;
  background: currentColor;
}

.nav-toggle__bar::before { top: -5px; }
.nav-toggle__bar::after { top: 5px; }

.nav-toggle__text { white-space: nowrap; }

.topbar__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  display: block;
  background: rgba(30, 42, 56, 0.8);
}

.topbar__progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--c-blue), var(--c-live));
}

@media (min-width: 1024px) {
  .topbar__progress { display: none; }
}

/* ---------- 12. 页头：栏目导航 ---------- */
.site-nav {
  position: fixed;
  inset: 0;
  z-index: 52;
  display: flex;
  flex-direction: column;
  padding: calc(var(--bar-h) + 20px) 0 28px;
  overflow-y: auto;
  background:
    linear-gradient(180deg, rgba(10, 132, 255, 0.12), rgba(6, 8, 12, 0) 42%),
    var(--c-void);
  border-right: 1px solid var(--c-grid);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity 220ms var(--ease-speed), transform 260ms var(--ease-speed), visibility 0s linear 220ms;
}

.site-nav[data-open] {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: 0s;
}

.site-nav__list { display: flex; flex-direction: column; padding-inline: var(--gutter); }

.site-nav__item {
  border-bottom: 1px solid var(--c-grid);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 240ms var(--ease-speed), transform 300ms var(--ease-speed);
}

.site-nav__item:first-child { border-top: 1px solid var(--c-grid); }

.site-nav[data-open] .site-nav__item { opacity: 1; transform: none; }
.site-nav[data-open] .site-nav__item:nth-child(1) { transition-delay: 40ms; }
.site-nav[data-open] .site-nav__item:nth-child(2) { transition-delay: 100ms; }
.site-nav[data-open] .site-nav__item:nth-child(3) { transition-delay: 160ms; }
.site-nav[data-open] .site-nav__item:nth-child(4) { transition-delay: 220ms; }
.site-nav[data-open] .site-nav__item:nth-child(5) { transition-delay: 280ms; }
.site-nav[data-open] .site-nav__item:nth-child(6) { transition-delay: 340ms; }

.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  min-height: 56px;
  padding: 16px 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-bright);
  transition: color 160ms var(--ease-speed);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-blue);
}

.site-nav__link:hover { color: var(--c-blue-soft); }

.site-nav__link[aria-current="page"] { color: var(--c-blue-soft); }
.site-nav__link[aria-current="page"] .site-nav__num { color: var(--c-orange); }

.site-nav__meta {
  padding: 18px var(--gutter) 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(199, 210, 222, 0.72);
}

@media (min-width: 1024px) {
  .site-nav {
    position: static;
    inset: auto;
    z-index: auto;
    flex: 0 1 auto;
    flex-direction: row;
    align-items: center;
    padding: 0;
    overflow: visible;
    background: none;
    border-right: 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: none;
  }

  .site-nav__list {
    flex-direction: row;
    gap: clamp(10px, 1.5vw, 26px);
    padding-inline: 0;
  }

  .site-nav__item {
    border: 0;
    opacity: 1;
    transform: none;
    transition: none;
  }

  .site-nav__item:first-child { border-top: 0; }

  .site-nav__link {
    position: relative;
    min-height: 44px;
    padding: 0;
    align-items: center;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--c-text);
  }

  .site-nav__link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 8px;
    width: 100%;
    height: 1px;
    background: var(--c-orange);
    transform: scaleX(0) rotate(-8deg);
    transform-origin: left center;
    transition: transform 180ms var(--ease-speed);
  }

  .site-nav__link:hover::after,
  .site-nav__link:focus-visible::after { transform: scaleX(1) rotate(-8deg); }

  .site-nav__num { display: none; }
  .site-nav__meta { display: none; }
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  border-top: 1px solid var(--c-grid);
  background: linear-gradient(180deg, rgba(14, 21, 32, 0.62), rgba(6, 8, 12, 0) 62%);
}

.footer__inner {
  display: grid;
  gap: clamp(32px, 4vw, 56px);
  max-width: var(--container);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 84px) var(--gutter) clamp(28px, 4vw, 52px);
}

@media (min-width: 1024px) {
  .footer__inner { grid-template-columns: minmax(220px, 1fr) 2.4fr; }
}

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

.footer__logo {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-bright);
}

.footer__logo-mark {
  padding: 1px 5px;
  border: 1px solid rgba(10, 132, 255, 0.5);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-blue);
}

.footer__note { max-width: 34ch; font-size: 14.5px; }

.footer__live {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text);
}

.footer__live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-live);
  box-shadow: 0 0 0 3px rgba(43, 224, 122, 0.14);
}

.footer__cta { margin-top: 6px; }

.footer__columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (min-width: 768px) {
  .footer__columns { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.footer__col {
  padding: 18px 16px 10px;
  border-top: 1px solid var(--c-grid);
}

@media (min-width: 768px) {
  .footer__col + .footer__col { border-left: 1px solid var(--c-grid); }
}

.footer__col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-blue-soft);
}

.footer__item + .footer__item { margin-top: 10px; }

.footer__link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--c-text);
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease-speed), border-color 160ms var(--ease-speed);
}

.footer__link:hover { color: var(--c-bright); border-bottom-color: var(--c-orange); }

.footer__text {
  display: inline-block;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(199, 210, 222, 0.86);
  word-break: break-word;
}

.footer__legal { border-top: 1px solid var(--c-grid); }

.footer__legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  max-width: var(--container);
  margin-inline: auto;
  padding: 16px var(--gutter);
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(199, 210, 222, 0.78);
}

.footer__icp { letter-spacing: 0.06em; }
.footer__meta { color: rgba(199, 210, 222, 0.62); }

/* ---------- 14. 平板与手机微调 ---------- */
@media (max-width: 1023px) {
  body { font-size: 16.5px; }

  .chapter__title { font-size: clamp(1.75rem, 6.4vw, 2.4rem); }

  .site-header .rail { display: none; }
}

@media (max-width: 420px) {
  .nav-toggle__text { display: none; }
}

/* ---------- 15. reduced motion ---------- */
@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;
  }

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

  .topbar:hover .topbar__speedline::after { width: 34px; }

  .site-nav[data-open] .site-nav__item { transition-delay: 0ms !important; }
}