/* =========================================================
   星空赛场 sports-starlink.com.cn
   /assets/site.css — 共享外壳样式
   深墨星空 / 星云蓝 / 暖纸 / 荧光青 / 暖橙
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

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

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

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

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

button, input, select, textarea { font: inherit; color: inherit; }

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

table { border-collapse: collapse; width: 100%; }

hr { border: 0; height: 1px; background: var(--sl-line); margin: 0; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色板 */
  --sl-ink: #0B1220;
  --sl-nebula: #14224A;
  --sl-paper: #F2EAD9;
  --sl-ink-deep: #060A12;
  --sl-silver: #E9EEF6;
  --sl-cyan: #2FF3D5;
  --sl-ember: #FF8A3A;
  --sl-slate: #8A9AB4;
  --sl-purple: #6E5AC8;
  --sl-gold: #FFC857;

  /* 线条 */
  --sl-line: rgba(138, 154, 180, 0.26);
  --sl-line-strong: rgba(138, 154, 180, 0.52);
  --sl-line-dark: rgba(11, 18, 32, 0.18);

  /* 字体 */
  --sl-font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC",
    "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --sl-font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC",
    "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --sl-font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo,
    Consolas, "Courier New", monospace;

  /* 切角 */
  --sl-notch: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  --sl-notch-sm: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  --sl-notch-tl: polygon(14px 0, 100% 0, 100% 100%, 0 100%, 0 14px);

  /* 尺度 */
  --sl-gutter: clamp(20px, 4vw, 56px);
  --sl-gap: clamp(16px, 2vw, 28px);
  --sl-shell: 1280px;
}

/* ---------- 3. 中文基础排版 ---------- */
body {
  background-color: var(--sl-ink);
  color: var(--sl-silver);
  font-family: var(--sl-font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body > main { flex: 1 0 auto; }

strong, b { font-weight: 700; }

::selection {
  background: var(--sl-cyan);
  color: var(--sl-ink-deep);
}

:focus-visible {
  outline: 2px solid var(--sl-cyan);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ---------- 4. 容器与栅格 ---------- */
.sl-shell {
  width: 100%;
  max-width: var(--sl-shell);
  margin-inline: auto;
  padding-inline: var(--sl-gutter);
}

.sl-grid {
  display: grid;
  gap: var(--sl-gap);
}

.sl-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.sl-editorial {
  display: grid;
  gap: var(--sl-gap);
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) minmax(0, 6fr);
}

.sl-editorial--a { grid-template-columns: minmax(0, 3fr) minmax(0, 1fr) minmax(0, 5fr); }

.sl-editorial > .sl-col-lead { grid-column: 1; }
.sl-editorial > .sl-col-note { grid-column: 2; }
.sl-editorial > .sl-col-wide { grid-column: 3; }

/* ---------- 5. 排版工具 ---------- */
.sl-display {
  font-family: var(--sl-font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.03;
  color: var(--sl-silver);
}

.sl-display--xl { font-size: clamp(44px, 9vw, 112px); }
.sl-display--l { font-size: clamp(32px, 5vw, 64px); }

.sl-h2 {
  font-family: var(--sl-font-display);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--sl-silver);
}

.sl-h3 {
  font-family: var(--sl-font-display);
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--sl-silver);
}

.sl-mono {
  font-family: var(--sl-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.sl-index-label {
  display: inline-block;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sl-slate);
}

.sl-note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--sl-slate);
  max-width: 30ch;
}

.sl-prose {
  max-width: 38em;
  font-size: 16.5px;
  line-height: 1.78;
}

.sl-prose p + p { margin-top: 1.1em; }
.sl-prose strong { color: var(--sl-cyan); }

.sl-rule {
  height: 1px;
  background: var(--sl-line);
  border: 0;
}

.sl-rule--cyan { background: var(--sl-cyan); }

/* ---------- 6. 区块 ---------- */
.sl-section { padding-block: clamp(48px, 7vw, 96px); }

.sl-section--tight { padding-block: clamp(28px, 4vw, 52px); }

.sl-section--paper {
  background-color: var(--sl-paper);
  color: var(--sl-ink);
}

.sl-section--paper .sl-h2,
.sl-section--paper .sl-h3,
.sl-section--paper .sl-display { color: var(--sl-ink-deep); }

.sl-section--paper .sl-note,
.sl-section--paper .sl-index-label { color: #4A5468; }

.sl-section--paper .sl-rule { background: var(--sl-line-dark); }

/* ---------- 7. 页头 ---------- */
.sl-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background-color: var(--sl-ink);
  border-bottom: 1px solid var(--sl-line);
}

.sl-skip {
  position: absolute;
  left: -9999px;
  top: 6px;
  z-index: 300;
  padding: 10px 18px;
  background-color: var(--sl-cyan);
  color: var(--sl-ink-deep);
  font-family: var(--sl-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  clip-path: var(--sl-notch-sm);
}

.sl-skip:focus {
  left: var(--sl-gutter);
}

/* 上层状态条 */
.sl-topbar {
  background-color: var(--sl-ink-deep);
  border-bottom: 1px solid rgba(138, 154, 180, 0.16);
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--sl-slate);
}

.sl-topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 38px;
  padding-block: 6px;
}

.sl-topbar__brand {
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sl-topbar__meta {
  display: flex;
  align-items: center;
  gap: 20px;
  flex: 0 0 auto;
}

.sl-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--sl-cyan);
  white-space: nowrap;
}

.sl-status__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background-color: var(--sl-cyan);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.sl-utility {
  display: flex;
  align-items: center;
  gap: 16px;
}

.sl-utility a {
  color: var(--sl-slate);
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 0.12s ease, border-color 0.12s ease;
}

.sl-utility a:hover,
.sl-utility a:focus-visible {
  color: var(--sl-silver);
  border-bottom-color: var(--sl-cyan);
}

/* 下层导航条 */
.sl-navbar {
  position: relative;
  background-color: var(--sl-ink);
}

.sl-navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  min-height: 76px;
}

.sl-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.sl-brand__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background-color: var(--sl-cyan);
  color: var(--sl-ink-deep);
  font-family: var(--sl-font-display);
  font-size: 18px;
  font-weight: 900;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background-color 0.14s ease;
}

.sl-brand:hover .sl-brand__mark { background-color: var(--sl-gold); }

.sl-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.sl-brand__name {
  font-family: var(--sl-font-display);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--sl-silver);
}

.sl-brand__domain {
  font-family: var(--sl-font-mono);
  font-size: 11px;
  letter-spacing: 0.07em;
  color: var(--sl-slate);
}

/* 主导航 */
.sl-nav__list {
  display: flex;
  align-items: center;
}

.sl-nav__item {
  position: relative;
  display: flex;
  align-items: center;
}

.sl-nav__item + .sl-nav__item::before {
  content: "";
  width: 1px;
  height: 16px;
  margin-inline: 14px;
  background-color: var(--sl-line-strong);
  transform: rotate(18deg);
}

.sl-nav__item a {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--sl-silver);
  white-space: nowrap;
  transition: color 0.12s ease;
}

.sl-nav__item a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 3px;
  height: 2px;
  background-color: var(--sl-cyan);
  transition: right 0.12s ease;
}

.sl-nav__item a:hover,
.sl-nav__item a:focus-visible { color: var(--sl-cyan); }

.sl-nav__item a:hover::after,
.sl-nav__item a:focus-visible::after { right: 0; }

.sl-nav__item a[aria-current="page"] { color: var(--sl-cyan); }

.sl-nav__item a[aria-current="page"]::after {
  right: 0;
  clip-path: polygon(0 0, 100% 0, calc(100% - 9px) 100%, 0 100%);
}

/* 移动导航按钮 */
.sl-nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--sl-line-strong);
  color: var(--sl-silver);
  font-family: var(--sl-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  clip-path: var(--sl-notch-sm);
  transition: color 0.12s ease, border-color 0.12s ease;
}

.sl-nav-toggle:hover,
.sl-nav-toggle[aria-expanded="true"] {
  color: var(--sl-cyan);
  border-color: var(--sl-cyan);
}

.sl-nav-toggle__icon {
  width: 16px;
  height: 10px;
  background-image:
    linear-gradient(currentColor, currentColor),
    linear-gradient(currentColor, currentColor);
  background-size: 100% 2px, 100% 2px;
  background-position: 0 0, 0 100%;
  background-repeat: no-repeat;
}

/* 阅读进度 */
.sl-progress {
  position: relative;
  height: 2px;
  background-color: rgba(138, 154, 180, 0.16);
}

.sl-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  background-color: var(--sl-cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* ---------- 8. 页脚 ---------- */
.sl-footer {
  flex: 0 0 auto;
  position: relative;
  background-color: var(--sl-ink-deep);
  color: var(--sl-slate);
  font-size: 14px;
  border-top: 1px solid var(--sl-line);
}

.sl-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--sl-cyan), var(--sl-purple) 55%, transparent 100%);
}

.sl-footer__inner {
  padding-block: clamp(40px, 6vw, 76px) 26px;
}

.sl-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: clamp(24px, 4vw, 52px);
}

.sl-footer__lead { max-width: 34ch; }

.sl-footer__logo {
  font-family: var(--sl-font-display);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--sl-silver);
}

.sl-footer__domain {
  margin-top: 5px;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.07em;
  color: var(--sl-cyan);
}

.sl-footer__closing {
  margin-top: 20px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--sl-silver);
}

.sl-footer__closing-sub {
  margin-top: 8px;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sl-slate);
}

.sl-footer__title {
  padding-bottom: 10px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--sl-line);
  font-family: var(--sl-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sl-silver);
}

.sl-footer__list li + li { margin-top: 10px; }

.sl-footer__list a {
  color: var(--sl-slate);
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 0.12s ease, border-color 0.12s ease;
}

.sl-footer__list a:hover,
.sl-footer__list a:focus-visible {
  color: var(--sl-cyan);
  border-bottom-color: var(--sl-cyan);
}

.sl-footer__contact {
  margin-top: clamp(32px, 4vw, 52px);
  padding-top: 22px;
  border-top: 1px solid var(--sl-line);
  display: grid;
  gap: 6px;
}

.sl-footer__contact-line {
  font-family: var(--sl-font-mono);
  font-size: 13.5px;
  letter-spacing: 0.03em;
  color: var(--sl-silver);
}

.sl-footer__address { font-size: 13.5px; }

.sl-footer__note {
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(138, 154, 180, 0.85);
  max-width: 62ch;
}

.sl-footer__base {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(138, 154, 180, 0.16);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 26px;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--sl-slate);
}

.sl-footer__legal { color: var(--sl-silver); }

.sl-footer__hint { color: var(--sl-ember); }

.sl-footer__year { margin-left: auto; }

/* ---------- 9. 面包屑 ---------- */
.sl-breadcrumb {
  padding-block: 18px;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sl-slate);
}

.sl-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.sl-breadcrumb li { display: inline-flex; align-items: center; }

.sl-breadcrumb li + li::before {
  content: "";
  display: inline-block;
  width: 1px;
  height: 12px;
  margin-inline: 11px;
  background-color: var(--sl-line-strong);
  transform: rotate(24deg);
}

.sl-breadcrumb a {
  color: var(--sl-slate);
  transition: color 0.12s ease;
}

.sl-breadcrumb a:hover { color: var(--sl-cyan); }

.sl-breadcrumb [aria-current="page"] { color: var(--sl-silver); }

/* ---------- 10. 索引条 ---------- */
.sl-index-strip {
  background-color: var(--sl-ink);
  border-top: 1px solid var(--sl-line);
  border-bottom: 1px solid var(--sl-line);
}

.sl-index-strip__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-block: 13px;
  overflow-x: auto;
  scrollbar-width: none;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.09em;
}

.sl-index-strip__inner::-webkit-scrollbar { height: 0; }

.sl-index-strip a {
  flex: 0 0 auto;
  color: var(--sl-slate);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.12s ease, border-color 0.12s ease;
}

.sl-index-strip a:hover,
.sl-index-strip a:focus-visible {
  color: var(--sl-silver);
  border-bottom-color: var(--sl-cyan);
}

.sl-index-strip a[data-active] {
  color: var(--sl-cyan);
  border-bottom-color: var(--sl-cyan);
}

/* ---------- 11. 按钮 ---------- */
.sl-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid var(--sl-line-strong);
  background-color: transparent;
  color: var(--sl-silver);
  font-family: var(--sl-font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.09em;
  clip-path: var(--sl-notch-sm);
  transition: background-color 0.14s ease, color 0.14s ease,
    border-color 0.14s ease, transform 0.14s ease;
}

.sl-btn:hover,
.sl-btn:focus-visible { transform: translateY(-2px); }

.sl-btn--primary {
  background-color: var(--sl-cyan);
  border-color: var(--sl-cyan);
  color: var(--sl-ink-deep);
}

.sl-btn--primary:hover { background-color: #86F8E7; }

.sl-btn--ember {
  border-color: var(--sl-ember);
  color: var(--sl-ember);
}

.sl-btn--ember:hover {
  background-color: var(--sl-ember);
  color: var(--sl-ink-deep);
}

.sl-btn--ghost:hover {
  border-color: var(--sl-cyan);
  color: var(--sl-cyan);
}

.sl-btn--block { width: 100%; justify-content: center; }

/* ---------- 12. 数据卡 ---------- */
.sl-card {
  position: relative;
  display: block;
  background-color: var(--sl-nebula);
  padding: 20px 22px 28px;
  clip-path: var(--sl-notch);
  transition: transform 0.16s ease, background-color 0.16s ease;
}

.sl-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 2px;
  background-color: var(--sl-slate);
  transition: width 0.16s ease, background-color 0.16s ease;
}

.sl-card:hover,
.sl-card:focus-within {
  transform: translateY(-2px);
  background-color: #182A58;
}

.sl-card:hover::after,
.sl-card:focus-within::after {
  width: 84px;
  background-color: var(--sl-cyan);
}

.sl-card__label {
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--sl-slate);
}

.sl-card__value {
  margin-top: 10px;
  font-family: var(--sl-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--sl-silver);
}

.sl-card__value--cyan { color: var(--sl-cyan); }
.sl-card__value--ember { color: var(--sl-ember); }
.sl-card__value--gold { color: var(--sl-gold); }

.sl-card__meta {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--sl-slate);
}

.sl-card--paper {
  background-color: var(--sl-paper);
}

.sl-card--paper .sl-card__label { color: #5A6478; }
.sl-card--paper .sl-card__value { color: var(--sl-ink-deep); }
.sl-card--paper .sl-card__meta { color: #4A5468; }
.sl-card--paper:hover { background-color: #EDE3CE; }

/* ---------- 13. 横滑轨道 ---------- */
.sl-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(232px, 78%);
  gap: var(--sl-gap);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  padding-bottom: 12px;
  -webkit-overflow-scrolling: touch;
}

.sl-rail > * { scroll-snap-align: start; }

.sl-rail::-webkit-scrollbar { height: 6px; }

.sl-rail::-webkit-scrollbar-track {
  background-color: rgba(138, 154, 180, 0.14);
}

.sl-rail::-webkit-scrollbar-thumb { background-color: var(--sl-slate); }

/* ---------- 14. 图片容器基础 ---------- */
.sl-figure { margin: 0; }

.sl-figure__media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: var(--sl-nebula);
  background-image:
    linear-gradient(180deg, rgba(11, 18, 32, 0.15) 0%, rgba(6, 10, 18, 0.82) 100%),
    repeating-linear-gradient(90deg, rgba(138, 154, 180, 0.14) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(138, 154, 180, 0.14) 0 1px, transparent 1px 72px);
  border: 1px solid var(--sl-line);
  clip-path: var(--sl-notch);
  overflow: hidden;
}

.sl-figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.sl-figure__cap {
  display: flex;
  gap: 10px;
  margin-top: 10px;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--sl-slate);
}

.sl-figure__cap::before {
  content: "";
  flex: 0 0 22px;
  height: 1px;
  margin-top: 0.72em;
  background-color: var(--sl-cyan);
}

/* ---------- 15. 装饰 ---------- */
.sl-slash {
  display: inline-block;
  width: 1px;
  height: 14px;
  background-color: var(--sl-line-strong);
  transform: rotate(24deg);
  vertical-align: -2px;
}

.sl-dot-grid {
  background-image: radial-gradient(rgba(138, 154, 180, 0.4) 1px, transparent 1px);
  background-size: 18px 18px;
}

.sl-starlink {
  height: 1px;
  background-image: linear-gradient(
    90deg,
    transparent 0,
    var(--sl-purple) 12%,
    var(--sl-cyan) 50%,
    var(--sl-purple) 88%,
    transparent 100%
  );
  opacity: 0.7;
}

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1080px) {
  .sl-footer__grid { grid-template-columns: 1fr 1fr 1fr; }
  .sl-footer__lead { grid-column: 1 / -1; max-width: 46ch; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 104px; }

  .sl-navbar__inner {
    min-height: 66px;
    gap: 16px;
  }

  .sl-nav-toggle { display: inline-flex; }

  .sl-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background-color: var(--sl-ink-deep);
    border-top: 1px solid var(--sl-line-strong);
    max-height: min(74vh, 520px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .sl-nav[data-open] { display: block; }

  .sl-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
  }

  .sl-nav__item { width: 100%; }

  .sl-nav__item + .sl-nav__item::before { display: none; }

  .sl-nav__item a {
    display: block;
    padding: 15px var(--sl-gutter);
    font-size: 16px;
    border-bottom: 1px solid rgba(138, 154, 180, 0.14);
  }

  .sl-nav__item a::after { display: none; }

  .sl-nav__item a[aria-current="page"] {
    color: var(--sl-cyan);
    background-image: linear-gradient(90deg, rgba(47, 243, 213, 0.16), transparent 72%);
    box-shadow: inset 3px 0 0 var(--sl-cyan);
  }

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

  .sl-editorial > .sl-col-lead,
  .sl-editorial > .sl-col-note,
  .sl-editorial > .sl-col-wide { grid-column: 1; }

  .sl-note { max-width: 46ch; }
}

@media (max-width: 720px) {
  .sl-topbar__inner { gap: 10px; }

  .sl-topbar__brand {
    white-space: normal;
    overflow: visible;
    font-size: 11px;
    line-height: 1.5;
  }

  .sl-status { display: none; }

  .sl-utility { gap: 14px; font-size: 11px; }

  .sl-brand__domain { display: none; }

  .sl-footer__grid { grid-template-columns: 1fr 1fr; }

  .sl-footer__base {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .sl-footer__year { margin-left: 0; }
}

@media (max-width: 480px) {
  body { font-size: 15.5px; }

  .sl-footer__grid { grid-template-columns: 1fr; }

  .sl-btn { width: 100%; justify-content: center; }
}

/* 桌面端横滑轨道收为等宽网格 */
@media (min-width: 901px) {
  .sl-rail {
    grid-auto-flow: row;
    grid-template-columns: repeat(auto-fit, minmax(212px, 1fr));
    grid-auto-columns: auto;
    overflow: visible;
    scroll-snap-type: none;
    padding-bottom: 0;
  }
}

/* ---------- 17. 无障碍与减动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .sl-btn:hover,
  .sl-card:hover,
  .sl-card:focus-within { transform: none; }
}

@media print {
  .sl-header,
  .sl-footer,
  .sl-progress { display: none; }

  body {
    background: #fff;
    color: #000;
  }
}