/* ==========================================================================
   宝威赛场 · BV SPORTS — 共享样式表 /assets/site.css
   深蓝底场 + 荧光橙轴心 + 电光青数据线，报头式页头与赛道带页脚
   ========================================================================== */

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; background: #061226; }

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

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

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

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

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

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

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

hr { border: 0; border-top: 1px solid rgba(143, 163, 187, .22); margin: 0; }

[hidden] { display: none !important; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --navy-950: #050F1F;
  --navy-900: #061226;
  --navy-800: #0A1B33;
  --navy-700: #102A4E;
  --steel: #153A66;
  --steel-2: #1E4E85;
  --orange: #FF6A13;
  --orange-deep: #E4540A;
  --amber: #FFA53B;
  --cyan: #19E3C6;
  --green: #2FBF5B;
  --gold: #E9C77C;
  --mist: #F3F6FA;
  --stone: #8FA3BB;
  --stone-deep: #6F86A3;
  --ink: #04101F;
  --line: rgba(143, 163, 187, .22);
  --line-strong: rgba(143, 163, 187, .42);

  --shell: 1200px;
  --gutter: clamp(16px, 4.4vw, 40px);

  --r-xs: 6px;
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 26px;
  --r-pill: 999px;

  --shadow-1: 0 16px 34px -26px rgba(0, 0, 0, .95);
  --shadow-2: 0 30px 60px -34px rgba(0, 0, 0, .95);

  --ease: cubic-bezier(.22, .72, .28, 1);

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-num: "SFMono-Regular", Menlo, Consolas, "Roboto Mono", ui-monospace, monospace;
}

/* ---------- 3. 基础排版（中文） ---------- */
body {
  min-height: 100%;
  background:
    radial-gradient(1200px 520px at 12% -10%, rgba(21, 58, 102, .78), transparent 62%),
    radial-gradient(900px 420px at 96% 2%, rgba(25, 227, 198, .10), transparent 60%),
    var(--navy-800);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--mist);
}

h1 { font-size: clamp(34px, 5.6vw, 64px); }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: clamp(20px, 2.2vw, 24px); }
h4 { font-size: 18px; }

strong { color: #FFFFFF; font-weight: 700; }

.num,
[data-num] {
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

::selection { background: var(--orange); color: #06121f; }

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

[id] { scroll-margin-top: 132px; }

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

.section { position: relative; padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(32px, 4.4vw, 56px); }

.grid { display: grid; gap: clamp(16px, 2.4vw, 26px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

.stack > * + * { margin-top: var(--stack, 16px); }

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

.divider {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 44px);
  background: linear-gradient(90deg, var(--orange), rgba(25, 227, 198, .6) 58%, transparent);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .05em;
  white-space: nowrap;
  transition: transform .22s var(--ease), background-color .22s var(--ease),
              border-color .22s var(--ease), color .22s var(--ease), box-shadow .22s var(--ease);
}

.btn:hover { transform: translateY(-2px); }

.btn--accent {
  background: linear-gradient(120deg, var(--orange), var(--amber));
  color: #06121f;
  box-shadow: 0 12px 26px -18px rgba(255, 106, 19, .95);
}
.btn--accent:hover {
  border-color: var(--cyan);
  box-shadow: 0 16px 30px -16px rgba(255, 106, 19, 1);
}

.btn--ghost {
  background: rgba(21, 58, 102, .35);
  border-color: var(--line-strong);
  color: var(--mist);
}
.btn--ghost:hover {
  background: rgba(25, 227, 198, .12);
  border-color: var(--cyan);
  color: #FFFFFF;
}

.btn--cyan { background: var(--cyan); color: #04202a; }
.btn--cyan:hover { box-shadow: 0 14px 26px -16px rgba(25, 227, 198, .9); }

/* ---------- 6. 状态胶囊 / 标签 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(21, 58, 102, .45);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--stone);
}

.chip--accent { color: var(--amber); border-color: rgba(255, 165, 59, .5); background: rgba(255, 106, 19, .12); }
.chip--live { color: var(--green); border-color: rgba(47, 191, 91, .5); background: rgba(47, 191, 91, .12); }
.chip--gold { color: var(--gold); border-color: rgba(233, 199, 124, .45); background: rgba(233, 199, 124, .1); }

/* ---------- 7. 卡片 / 数字面板 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(21, 58, 102, .72), rgba(10, 27, 51, .88));
  box-shadow: var(--shadow-1);
  transition: transform .26s var(--ease), border-color .26s var(--ease), box-shadow .26s var(--ease);
}

.card:hover { transform: translateY(-2px); border-color: var(--cyan); box-shadow: var(--shadow-2); }

.card--cut { border-radius: var(--r-lg) var(--r-sm) var(--r-lg) var(--r-sm); }

.card__title { font-size: 20px; margin-bottom: 8px; }

.card__meta { font-size: 13.5px; letter-spacing: .05em; color: var(--stone); }

.stat { display: flex; flex-direction: column; gap: 6px; }

.stat__value {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--mist);
}
.stat__value span { font-size: .48em; margin-left: 4px; color: var(--stone); }
.stat--accent .stat__value { color: var(--amber); }
.stat--cyan .stat__value { color: var(--cyan); }

.stat__label { font-size: 13.5px; letter-spacing: .1em; color: var(--stone); }

/* ---------- 8. 区块标题 / 内页头 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.section-head__eyebrow {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.section-head__title { font-size: clamp(24px, 3vw, 38px); }

.section-head__note { max-width: 60ch; font-size: 15px; color: var(--stone); }

.page-head { padding-block: clamp(26px, 4vw, 52px) clamp(18px, 3vw, 34px); }
.page-head__title { font-size: clamp(30px, 4.6vw, 54px); }
.page-head__lede { max-width: 62ch; margin-top: 14px; font-size: 17.5px; color: var(--stone); }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb { padding-block: 14px 0; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--stone);
}

.breadcrumb__list li + li::before { content: "/"; margin-right: 8px; color: var(--line-strong); }
.breadcrumb__link { transition: color .2s var(--ease); }
.breadcrumb__link:hover { color: var(--cyan); }
.breadcrumb__current { color: var(--mist); font-weight: 700; }

/* ---------- 10. 长文排版 ---------- */
.prose { max-width: 74ch; }
.prose > * + * { margin-top: 1.05em; }
.prose h2 { margin-top: 1.8em; font-size: clamp(24px, 3vw, 34px); }
.prose h3 { margin-top: 1.5em; }
.prose ul, .prose ol { padding-left: 1.25em; list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: .5em; }
.prose a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }
.prose blockquote { padding-left: 16px; border-left: 3px solid var(--orange); color: var(--stone); }
.prose code { font-family: var(--font-num); font-size: .92em; color: var(--amber); }

/* ---------- 11. 图片容器基础规则 ---------- */
.frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background:
    linear-gradient(135deg, rgba(25, 227, 198, .16), transparent 55%),
    repeating-linear-gradient(115deg, rgba(243, 246, 250, .045) 0 12px, transparent 12px 26px),
    linear-gradient(150deg, var(--steel), var(--navy-900));
}

.frame img,
.frame video { width: 100%; height: 100%; object-fit: cover; }

.frame--wide { aspect-ratio: 21 / 9; }
.frame--tall { aspect-ratio: 3 / 4; }
.frame--square { aspect-ratio: 1 / 1; }
.frame--cut { border-radius: var(--r-sm); clip-path: polygon(0 0, 100% 0, 100% 84%, 88% 100%, 0 100%); }

.frame__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 14px 16px;
  font-size: 13.5px;
  color: var(--mist);
  background: linear-gradient(180deg, transparent, rgba(4, 16, 31, .92));
}

/* ---------- 12. 主题筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  width: fit-content;
  max-width: 100%;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(6, 18, 38, .62);
}

.filter-btn {
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--stone);
  transition: transform .2s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease), background-color .2s var(--ease);
}

.filter-btn:hover { color: var(--mist); border-color: var(--line-strong); transform: translateY(-2px); }
.filter-btn[aria-pressed="true"] { background: linear-gradient(120deg, var(--orange), var(--amber)); color: #06121f; }

/* ---------- 13. 入场显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .38s var(--ease), transform .38s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 14. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, var(--navy-950), var(--navy-800));
  border-bottom: 1px solid rgba(25, 227, 198, .22);
  box-shadow: 0 18px 34px -28px #000;
}

.header-rail {
  height: 3px;
  background: linear-gradient(90deg, var(--orange) 0%, var(--amber) 26%, var(--cyan) 64%, var(--steel-2) 100%);
}

.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  z-index: 9;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--orange), var(--amber) 40%, var(--cyan));
}

.skip-link {
  position: absolute;
  left: 50%;
  top: 6px;
  z-index: 99;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--orange);
  color: #06121f;
  font-size: 14px;
  font-weight: 800;
  transform: translate(-50%, -220%);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); }

/* 报头 */
.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: clamp(10px, 2vw, 26px);
  padding-block: clamp(12px, 1.6vw, 18px);
}

.masthead__lead { justify-self: start; display: flex; align-items: center; gap: 12px; }

.masthead__mark {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  background: linear-gradient(150deg, var(--orange), var(--amber));
  color: #06121f;
  font-family: var(--font-num);
  font-size: 20px;
  font-weight: 700;
  clip-path: polygon(16% 0, 100% 0, 84% 100%, 0 100%);
}

.masthead__leadline {
  font-size: 12.5px;
  letter-spacing: .28em;
  color: var(--stone);
  text-transform: uppercase;
}

.masthead__center { display: flex; flex-direction: column; align-items: center; gap: 3px; text-align: center; }

.masthead__brand { display: flex; flex-direction: column; align-items: center; gap: 3px; }

.masthead__cn {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  letter-spacing: .06em;
  color: var(--mist);
}

.masthead__en {
  padding-left: .42em;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .42em;
  color: var(--cyan);
  text-transform: uppercase;
}

.masthead__brand:hover .masthead__cn { color: #FFFFFF; }

.masthead__tag { font-size: 12.5px; letter-spacing: .12em; color: var(--stone); }

.masthead__aside { justify-self: end; display: flex; align-items: center; gap: 10px; }

/* 栏目标签条 */
.navline {
  position: relative;
  border-top: 1px solid rgba(143, 163, 187, .16);
  background: rgba(6, 18, 38, .66);
}

.navline__scroll {
  display: flex;
  align-items: stretch;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.navline__scroll::-webkit-scrollbar { display: none; }

.navline__list { display: flex; flex: 1 0 auto; align-items: stretch; gap: 2px; justify-content: center; }

.navline__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 16px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
  white-space: nowrap;
  color: #C9D6E6;
  transition: color .22s var(--ease), transform .22s var(--ease);
}

.navline__link::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 6px;
  height: 3px;
  border-radius: 3px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .26s var(--ease);
}

.navline__link:hover { color: #FFFFFF; transform: translateY(-2px); }
.navline__link:hover::after { transform: scaleX(1); }

.navline__link[aria-current="page"] { color: #FFFFFF; }
.navline__link[aria-current="page"]::after { background: var(--cyan); transform: scaleX(1); }

.navline__quick {
  position: sticky;
  right: 0;
  z-index: 2;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 48px;
  margin-left: 10px;
  padding: 0 20px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .08em;
  color: #06121f;
  background: linear-gradient(120deg, var(--orange), var(--amber));
  clip-path: polygon(12px 0, 100% 0, 100% 100%, 0 100%);
  transition: filter .22s var(--ease);
}
.navline__quick:hover { filter: brightness(1.08); }

.navline__dot { width: 8px; height: 8px; border-radius: 50%; background: #06121f; box-shadow: 0 0 0 3px rgba(6, 18, 31, .22); }

/* 移动端开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  height: 42px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(21, 58, 102, .5);
  color: var(--mist);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .06em;
  transition: transform .22s var(--ease), border-color .22s var(--ease), background-color .22s var(--ease);
}
.nav-toggle:hover { transform: translateY(-2px); border-color: var(--cyan); }

.nav-toggle__bars { display: grid; gap: 4px; width: 16px; }
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .25s var(--ease), opacity .2s var(--ease);
}

.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); }

/* ---------- 15. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(40px, 7vw, 90px);
  background: linear-gradient(180deg, var(--navy-800) 0%, var(--navy-900) 46%, var(--navy-950) 100%);
  border-top: 1px solid rgba(143, 163, 187, .2);
  color: #C9D6E6;
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: -1px;
  height: 4px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--steel-2) 38%, var(--orange) 78%, var(--amber) 100%);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
  padding-block: clamp(36px, 5vw, 68px) clamp(28px, 3vw, 40px);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 30px;
  letter-spacing: .06em;
  color: var(--mist);
}

.footer-brand__en {
  margin-top: 6px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .4em;
  color: var(--cyan);
}

.footer-brand__note { max-width: 34ch; margin-top: 14px; font-size: 15px; color: var(--stone); }

.footer-brand__cta { margin-top: 18px; }

.footer-col__title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .2em;
  color: var(--mist);
}

.footer-col li + li { margin-top: 2px; }

.footer-col__link {
  display: inline-block;
  padding: 6px 0;
  font-size: 15px;
  color: var(--stone);
  transition: color .2s var(--ease), transform .2s var(--ease);
}
.footer-col__link:hover { color: var(--cyan); transform: translateX(3px); }

.footer-contact {
  display: grid;
  gap: 6px;
  padding-block: 22px;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  color: var(--stone);
}

.footer-contact__line--muted { font-size: 13.5px; color: var(--stone-deep); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--stone);
}

.footer-legal { margin: 0; }
.footer-legal--muted { font-family: var(--font-num); letter-spacing: .08em; color: var(--stone-deep); }

/* 返回顶部 */
.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 70;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: rgba(6, 18, 38, .9);
  color: var(--cyan);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s var(--ease), transform .25s var(--ease),
              border-color .25s var(--ease), visibility .25s var(--ease);
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--cyan); transform: translateY(-2px); }
.to-top__arrow { font-size: 18px; line-height: 1; }

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .masthead {
    grid-template-columns: 1fr auto;
    gap: 10px;
    padding-block: 10px;
  }
  .masthead__lead { display: none; }
  .masthead__center { align-items: flex-start; text-align: left; }
  .masthead__brand { align-items: flex-start; }
  .masthead__cn { font-size: 24px; }
  .masthead__en { font-size: 10px; letter-spacing: .3em; }
  .masthead__tag { display: none; }
  .masthead__cta { display: none; }

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

  .navline__list { justify-content: flex-start; }
  .navline__quick { margin-left: 8px; padding: 0 16px; }

  .site-header[data-open] .navline {
    position: absolute;
    left: 0; right: 0; top: 100%;
    z-index: 5;
    padding-block: 10px 16px;
    background: linear-gradient(180deg, var(--navy-900), var(--navy-800));
    border-bottom: 1px solid rgba(25, 227, 198, .3);
    box-shadow: 0 26px 44px -26px #000;
  }
  .site-header[data-open] .navline__scroll { display: block; overflow: visible; }
  .site-header[data-open] .navline__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    width: 100%;
  }
  .site-header[data-open] .navline__link {
    justify-content: flex-start;
    height: auto;
    min-height: 46px;
    padding: 12px 14px;
    border-left: 3px solid var(--steel-2);
    border-radius: 12px;
    background: rgba(21, 58, 102, .5);
    transform: none;
  }
  .site-header[data-open] .navline__link::after { display: none; }
  .site-header[data-open] .navline__link[aria-current="page"] {
    border-left-color: var(--cyan);
    background: rgba(25, 227, 198, .12);
  }
  .site-header[data-open] .navline__quick {
    position: static;
    justify-content: center;
    width: 100%;
    height: 46px;
    margin: 12px 0 0;
    border-radius: 12px;
    clip-path: none;
  }

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

@media (max-width: 560px) {
  body { font-size: 16.5px; }
  .footer-top { grid-template-columns: 1fr; }
  .navline__link { padding: 0 12px; font-size: 14.5px; }
  .site-header[data-open] .navline__list { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .to-top { width: 42px; height: 42px; }
}

/* ---------- 17. 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;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
  .btn:hover,
  .card:hover,
  .navline__link:hover,
  .nav-toggle:hover,
  .filter-btn:hover,
  .to-top:hover { transform: none; }
}