/* ===========================================================
   中欧体育赛场 · 共享样式 /assets/site.css
   夜场记分牌视觉系统：深绿场域 + 玻璃导航 + 青柠高亮 + 暖橙数字
   =========================================================== */

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

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

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

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

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

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

a { color: inherit; }

i { font-style: normal; }

/* ---------- 2. 变量 ---------- */
:root {
  --c-deep: #071A15;
  --c-navy: #081426;
  --c-glass: #12342C;
  --c-card: #102B24;
  --c-lime: #C8FF3D;
  --c-orange: #FF8A3D;
  --c-cyan: #35E0C8;
  --c-chalk: #F2F5EE;
  --c-mist: #A9B8B0;
  --c-line: #2A463B;
  --c-alert: #FF5C5C;

  --rail-w: 72px;
  --header-h: 76px;
  --shell-w: 1180px;

  --f-display: "Barlow Condensed", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --f-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(.4, 0, .2, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  color: var(--c-chalk);
  background-color: var(--c-deep);
  background-image:
    radial-gradient(1100px 620px at 78% -12%, rgba(53, 224, 200, .09), transparent 62%),
    radial-gradient(900px 520px at -6% 4%, rgba(255, 138, 61, .07), transparent 58%),
    linear-gradient(180deg, rgba(8, 20, 38, .35), transparent 320px);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--f-display);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--c-chalk);
}

p { max-width: 72ch; }

::selection {
  background: var(--c-lime);
  color: #07150F;
}

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

/* ---------- 4. 通用骨架 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-w);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 40px);
}

.section {
  padding-block: clamp(46px, 7vw, 96px);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: clamp(22px, 3vw, 38px);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.band {
  background: var(--c-navy);
  border-block: 1px solid var(--c-line);
}

.band--glass {
  background:
    linear-gradient(180deg, rgba(18, 52, 44, .66), rgba(8, 20, 38, .58));
  border-block: 1px solid var(--c-line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--c-line), rgba(42, 70, 59, .08));
}

/* ---------- 5. 排版组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--c-cyan);
  flex: none;
}

.display {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(44px, 7vw, 96px);
  line-height: .95;
  letter-spacing: -.025em;
  color: var(--c-chalk);
}

.h2 {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.12;
  letter-spacing: -.015em;
}

.muted { color: var(--c-mist); }

.mono {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.score {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-orange);
}

.prose {
  max-width: 72ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.85;
  color: rgba(242, 245, 238, .84);
}

.prose > * + * { margin-top: 1.05em; }

.prose h2,
.prose h3 {
  margin-top: 1.9em;
  color: var(--c-chalk);
  font-size: clamp(21px, 2.2vw, 28px);
}

.prose ul,
.prose ol {
  list-style: disc;
  padding-left: 1.25em;
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: .45em; }

.prose a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose a:hover { color: var(--c-lime); }

/* ---------- 6. 按钮 / 标签 / 卡片 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--f-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}

.btn-primary {
  background: var(--c-lime);
  color: #07150F;
}

.btn-primary:hover {
  background: #DBFF72;
  transform: translateY(-1px);
}

.btn-ghost {
  background: rgba(18, 52, 44, .55);
  border-color: var(--c-line);
  color: var(--c-chalk);
}

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

.btn-sm {
  padding: 8px 14px;
  font-size: 13px;
}

.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-radius: 3px;
}

.card--glass {
  background: rgba(18, 52, 44, .55);
  border-color: rgba(42, 70, 59, .9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.6;
  color: var(--c-mist);
  white-space: nowrap;
}

.tag--lime {
  color: var(--c-lime);
  border-color: rgba(200, 255, 61, .45);
}

.tag--orange {
  color: var(--c-orange);
  border-color: rgba(255, 138, 61, .45);
}

/* ---------- 7. 图片容器基础规则 ---------- */
.media {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(150deg, rgba(18, 52, 44, .95), rgba(8, 20, 38, .95));
  border: 1px solid var(--c-line);
  border-radius: 3px;
}

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

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 26, 21, 0) 46%, rgba(7, 26, 21, .74));
  pointer-events: none;
}

.media--frame { padding: 7px; background-clip: padding-box; }

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media__caption {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  z-index: 1;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-mist);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .07em;
  color: var(--c-mist);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "›";
  color: var(--c-line);
}

.breadcrumb a {
  color: var(--c-mist);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.breadcrumb a:hover { color: var(--c-lime); }

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

/* ---------- 9. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  left: 14px;
  top: -90px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--c-lime);
  color: #07150F;
  font-family: var(--f-body);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 2px;
  transition: top .2s var(--ease);
}

.skip-link:focus {
  top: 14px;
}

/* ---------- 10. 左侧品牌轨道 ---------- */
.site-rail {
  display: none;
}

.rail-badge {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(200, 255, 61, .5);
  background: linear-gradient(135deg, rgba(200, 255, 61, .2), rgba(18, 52, 44, .2));
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-lime);
}

.rail-rule {
  width: 1px;
  flex: 1 1 auto;
  min-height: 26px;
  background: linear-gradient(180deg, var(--c-line), rgba(42, 70, 59, .1));
}

.rail-words {
  writing-mode: vertical-rl;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .42em;
  color: var(--c-mist);
}

.rail-dots {
  display: grid;
  gap: 6px;
  padding-bottom: 4px;
}

.rail-dots i {
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--c-line);
}

.rail-dots i:first-child {
  background: var(--c-orange);
  box-shadow: 0 0 8px rgba(255, 138, 61, .8);
}

/* ---------- 11. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  width: 100%;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.site-header[data-scrolled="true"] {
  background: rgba(7, 26, 21, .95);
  border-bottom-color: var(--c-line);
  box-shadow: 0 14px 34px rgba(3, 12, 10, .55);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 2vw, 26px);
  height: var(--header-h);
  padding-inline: clamp(18px, 4vw, 40px);
  max-width: var(--shell-w);
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--c-chalk);
  flex: none;
}

.brand-badge {
  position: relative;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--c-line);
  background: linear-gradient(135deg, rgba(200, 255, 61, .16), rgba(18, 52, 44, .7));
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--c-lime);
}

.brand-badge::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--c-orange);
}

.brand-text { display: grid; gap: 1px; }

.brand-name {
  display: block;
  font-family: var(--f-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .08em;
  line-height: 1.2;
}

.brand-sub {
  display: block;
  font-family: var(--f-mono);
  font-size: 9.5px;
  letter-spacing: .26em;
  color: var(--c-mist);
  line-height: 1.4;
}

/* 导航 */
.site-nav { margin-inline: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.5vw, 22px);
}

.nav-item { display: block; }

.nav-list a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 2px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .03em;
  color: var(--c-mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease);
}

.nav-num {
  font-family: var(--f-mono);
  font-size: 9.5px;
  letter-spacing: .06em;
  color: var(--c-mist);
  opacity: .6;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 1px;
  height: 2px;
  background: var(--c-lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .22s var(--ease);
}

.nav-list a:hover { color: var(--c-chalk); }
.nav-list a:hover::after { transform: scaleX(1); }

.nav-list a[aria-current="page"] { color: var(--c-lime); }
.nav-list a[aria-current="page"]::after { transform: scaleX(1); }
.nav-list a[aria-current="page"] .nav-num { color: var(--c-lime); opacity: 1; }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--c-line);
  border-radius: 2px;
  background: rgba(18, 52, 44, .6);
  color: var(--c-chalk);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .14em;
  cursor: pointer;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.nav-toggle:hover { border-color: var(--c-lime); color: var(--c-lime); }

.nav-toggle-bars {
  display: grid;
  gap: 3.5px;
  width: 16px;
}

.nav-toggle-bars i {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform .22s var(--ease), opacity .18s var(--ease);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) {
  opacity: 0;
}

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

/* 头部工具区 */
.header-utility {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.utility-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-lime);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, .16);
  flex: none;
}

.utility-text {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-mist);
  white-space: nowrap;
}

.header-cta { white-space: nowrap; }

/* 进度条 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
  background: rgba(42, 70, 59, .35);
}

.scroll-progress > span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-lime) 62%, var(--c-orange));
  transition: width .12s linear;
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(52px, 8vw, 112px);
  background:
    radial-gradient(720px 340px at 10% 0%, rgba(53, 224, 200, .08), transparent 62%),
    radial-gradient(560px 280px at 92% 8%, rgba(255, 138, 61, .06), transparent 60%),
    var(--c-navy);
  border-top: 1px solid var(--c-line);
  color: var(--c-mist);
}

.footer-scan {
  height: 16px;
  border-bottom: 1px solid rgba(42, 70, 59, .55);
  background-image: repeating-linear-gradient(90deg, var(--c-line) 0 1px, transparent 1px 16px);
  opacity: .8;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.45fr 1fr 1fr 1.2fr;
  gap: clamp(24px, 3.4vw, 48px);
  padding-block: clamp(38px, 5vw, 66px) clamp(28px, 3.6vw, 46px);
}

.footer-brand { display: grid; gap: 16px; align-content: start; }

.footer-summary {
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

.footer-brand .btn { justify-self: start; }

.footer-nav { display: grid; align-content: start; gap: 0; }

.footer-heading {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-line);
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--c-chalk);
}

.footer-links { display: grid; gap: 2px; }

.footer-links li { display: block; }

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 0;
  padding-block: 5px;
  font-size: 14px;
  color: var(--c-mist);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.footer-links a::before {
  content: "";
  width: 0;
  height: 1px;
  margin-right: 0;
  background: var(--c-lime);
  transition: width .2s var(--ease), margin-right .2s var(--ease);
}

.footer-links a:hover { color: var(--c-lime); }

.footer-links a:hover::before {
  width: 12px;
  margin-right: 7px;
}

.footer-links--plain a::before { display: none; }

.footer-contact-line {
  display: inline-block;
  padding-block: 5px;
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--c-chalk);
  word-break: break-word;
}

.footer-addr {
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px dashed rgba(42, 70, 59, .8);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
  max-width: 26ch;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 22px;
  padding-block: 18px 26px;
  border-top: 1px solid var(--c-line);
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: rgba(169, 184, 176, .82);
}

.footer-copy { max-width: none; }

.footer-legal {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  max-width: none;
}

.footer-legal a {
  color: var(--c-mist);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.footer-legal a:hover { color: var(--c-lime); }

.footer-legal span { color: var(--c-line); }

.footer-icp { max-width: none; }

/* 返回顶部 */
.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 80;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--c-line);
  border-radius: 2px;
  background: rgba(8, 26, 21, .92);
  color: var(--c-lime);
  font-family: var(--f-mono);
  font-size: 17px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s var(--ease), border-color .18s var(--ease);
}

.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover { border-color: var(--c-lime); }

/* ---------- 13. 响应式 ---------- */
@media (min-width: 1100px) {
  body { padding-left: var(--rail-w); }

  .site-rail {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 95;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    width: var(--rail-w);
    padding: 20px 0 24px;
    background: linear-gradient(180deg, rgba(8, 20, 38, .96), rgba(7, 26, 21, .96));
    border-right: 1px solid var(--c-line);
  }
}

@media (max-width: 1180px) {
  .utility-text { display: none; }

  .footer-top {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 980px) {
  :root { --header-h: 64px; }

  .site-header[data-scrolled="true"] { backdrop-filter: blur(12px); }

  .header-inner { gap: 12px; }

  .brand { order: 0; }
  .header-utility { order: 1; margin-left: auto; }
  .nav-toggle { order: 2; display: inline-flex; }
  .utility-dot { display: none; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-inline: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: rgba(8, 26, 21, .98);
    border-bottom: 1px solid var(--c-line);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: max-height .3s var(--ease), visibility .3s var(--ease);
  }

  .site-nav[data-open="true"] {
    max-height: 560px;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px clamp(18px, 4vw, 40px) 22px;
  }

  .nav-item { border-bottom: 1px solid rgba(42, 70, 59, .55); }
  .nav-item:last-child { border-bottom: 0; }

  .nav-list a {
    display: flex;
    width: 100%;
    padding: 14px 4px;
    font-size: 16px;
  }

  .nav-list a::after { display: none; }

  .nav-list a[aria-current="page"] {
    background: linear-gradient(90deg, rgba(200, 255, 61, .12), transparent 70%);
    box-shadow: inset 2px 0 0 var(--c-lime);
    padding-left: 12px;
  }

  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  body { font-size: 15px; }

  .brand-badge { width: 32px; height: 32px; font-size: 11px; }
  .brand-name { font-size: 15px; letter-spacing: .05em; }
  .brand-sub { font-size: 8.5px; letter-spacing: .2em; }

  .header-cta { padding: 7px 11px; font-size: 12px; }

  .footer-top { grid-template-columns: 1fr; gap: 26px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-addr { max-width: none; }

  .to-top { width: 42px; height: 42px; }
}

/* ---------- 14. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .to-top { transform: none; }
}