/* ============================================================
   买球网 · 共享样式 /assets/site.css
   冰凌蓝骨架 + 夜航黑底块 + 信号橙行动点
   ============================================================ */

/* ---------- 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, figcaption, blockquote, dl, dd, table, caption, th, td { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
strong { font-weight: 700; }

/* ---------- 2. 变量 ---------- */
:root {
  --mq-ice: #0E6E8C;
  --mq-ice-deep: #0A4F65;
  --mq-ice-pale: #6FB6CC;
  --mq-frost: #DCE9F0;
  --mq-snow: #F7FAFC;
  --mq-night: #0B1620;
  --mq-slate: #33475A;
  --mq-signal: #FF7A1A;
  --mq-signal-deep: #C2410C;
  --mq-ok: #2E7D5B;

  --mq-line: rgba(14, 110, 140, 0.18);
  --mq-line-soft: rgba(14, 110, 140, 0.10);
  --mq-line-dark: rgba(111, 182, 204, 0.28);

  --mq-shadow-1: 0 1px 2px rgba(11, 22, 32, 0.04), 0 8px 24px rgba(11, 22, 32, 0.06);
  --mq-shadow-2: 0 2px 6px rgba(11, 22, 32, 0.06), 0 18px 40px rgba(11, 22, 32, 0.12);

  --mq-grad-night: linear-gradient(140deg, #0B1620 0%, #0A4F65 52%, #0E6E8C 100%);
  --mq-grad-ice: linear-gradient(115deg, #0E6E8C 0%, #0A4F65 100%);
  --mq-grad-frost: linear-gradient(180deg, rgba(220, 233, 240, 0.9) 0%, rgba(247, 250, 252, 0) 100%);

  --mq-radius: 6px;
  --mq-shell: 1200px;
  --mq-header-h: 104px;
  --mq-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 中文排版基调 ---------- */
html, body { min-height: 100%; }

body {
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--mq-night);
  background-color: var(--mq-snow);
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.mq-main { display: block; padding-bottom: 0; }

.mq-h1 {
  font-size: clamp(2.4rem, 6vw, 5rem);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--mq-night);
}
.mq-h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 500;
  line-height: 1.24;
  letter-spacing: -0.005em;
}
.mq-h3 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
}
.mq-eyebrow {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--mq-ice);
  font-weight: 600;
}
.mq-lead {
  font-size: clamp(1.02rem, 1.5vw, 1.24rem);
  line-height: 1.72;
  color: var(--mq-slate);
  max-width: 62ch;
}
.mq-meta {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--mq-slate);
}
.mq-num { font-variant-numeric: tabular-nums; letter-spacing: 0.04em; }
.mq-price {
  font-size: clamp(64px, 9vw, 120px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--mq-night);
  border-bottom: 3px solid var(--mq-signal);
  display: inline-block;
  padding-bottom: 6px;
}
.mq-price__unit { font-size: 0.28em; letter-spacing: 0.15em; margin-left: 0.15em; font-weight: 500; color: var(--mq-slate); border: 0; }

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

/* ---------- 4. 焦点与跳过链接 ---------- */
:focus-visible {
  outline: 2px solid var(--mq-ice);
  outline-offset: 2px;
  border-radius: 2px;
}
.mq-header__upper :focus-visible,
.mq-footer :focus-visible,
.mq-section--night :focus-visible {
  outline-color: var(--mq-ice-pale);
}

.mq-skip {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--mq-night);
  color: var(--mq-snow);
  border: 1px solid var(--mq-ice-pale);
  border-radius: var(--mq-radius);
  font-size: 14px;
  transition: top 0.18s var(--mq-ease);
}
.mq-skip:focus { top: 12px; }

/* ---------- 5. 容器与网格 ---------- */
.mq-shell {
  width: 100%;
  max-width: var(--mq-shell);
  margin-inline: auto;
  padding-inline: 24px;
}

.mq-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}
.mq-col-3 { grid-column: span 3; }
.mq-col-4 { grid-column: span 4; }
.mq-col-6 { grid-column: span 6; }
.mq-col-8 { grid-column: span 8; }
.mq-col-9 { grid-column: span 9; }
.mq-col-12 { grid-column: span 12; }

.mq-stack > * + * { margin-top: 16px; }
.mq-stack--loose > * + * { margin-top: 28px; }

/* ---------- 6. 章节与左轴 ---------- */
.mq-section {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}
.mq-section--frost { background: var(--mq-frost); }
.mq-section--frost-top { background: var(--mq-grad-frost); }
.mq-section--night { background: var(--mq-night); color: var(--mq-snow); }
.mq-section--night .mq-h2,
.mq-section--night .mq-h1 { color: var(--mq-snow); }
.mq-section--night .mq-lead,
.mq-section--night .mq-meta { color: rgba(220, 233, 240, 0.78); }

.mq-chapter { scroll-margin-top: 128px; }

.mq-axis {
  position: sticky;
  top: calc(var(--mq-header-h) + 20px);
  align-self: start;
  border-left: 1px solid var(--mq-line);
  padding-left: 18px;
}
.mq-axis__no {
  display: block;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--mq-ice);
  font-variant-numeric: tabular-nums;
}
.mq-axis__name {
  display: block;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-top: 4px;
}
.mq-axis__meta {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mq-slate);
}

/* ---------- 7. 按钮 ---------- */
.mq-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px;
  letter-spacing: 0.06em;
  line-height: 1.2;
  transition: background-color 0.18s var(--mq-ease), color 0.18s var(--mq-ease),
              border-color 0.18s var(--mq-ease), transform 0.18s var(--mq-ease);
}
.mq-btn--line {
  border-color: var(--mq-ice);
  color: var(--mq-ice-deep);
  background: rgba(247, 250, 252, 0.7);
}
.mq-btn--line:hover { background: var(--mq-ice); color: var(--mq-snow); border-color: var(--mq-ice); }
.mq-btn--signal {
  background: var(--mq-signal);
  color: var(--mq-night);
  border-color: var(--mq-signal);
  font-weight: 600;
}
.mq-btn--signal:hover { background: var(--mq-signal-deep); border-color: var(--mq-signal-deep); color: var(--mq-snow); }
.mq-btn--quiet {
  border-color: var(--mq-line);
  color: var(--mq-slate);
}
.mq-btn--quiet:hover { border-color: var(--mq-ice-pale); color: var(--mq-ice-deep); }
.mq-btn:active { transform: translateY(1px); }

/* ---------- 8. 头部 ---------- */
.mq-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--mq-snow);
  border-bottom: 1px solid var(--mq-line);
}

.mq-header__upper {
  overflow: hidden;
  max-height: 46px;
  background: linear-gradient(90deg, #0B1620 0%, #0A4F65 58%, #0E6E8C 100%);
  color: rgba(220, 233, 240, 0.86);
  transition: max-height 0.22s var(--mq-ease), opacity 0.22s var(--mq-ease);
}
.mq-header[data-stuck] .mq-header__upper { max-height: 0; opacity: 0; }

.mq-header__upper-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-block: 8px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  line-height: 1.6;
}

.mq-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: none;
  color: var(--mq-snow);
  font-size: 14px;
}
.mq-brand__mark {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex: none;
  background: linear-gradient(135deg, #6FB6CC 0%, #0E6E8C 100%);
  box-shadow: 0 0 0 1px rgba(111, 182, 204, 0.5), 0 0 12px rgba(14, 110, 140, 0.6);
}
.mq-brand__name { font-weight: 600; letter-spacing: 0.08em; }
.mq-brand__sub {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: rgba(220, 233, 240, 0.62);
  border-left: 1px solid var(--mq-line-dark);
  padding-left: 9px;
}

.mq-header__status { color: rgba(220, 233, 240, 0.72); }
.mq-header__hours {
  margin-left: auto;
  flex: none;
  color: rgba(220, 233, 240, 0.9);
  font-variant-numeric: tabular-nums;
}

.mq-header__lower { background: rgba(247, 250, 252, 0.94); }

.mq-header__lower-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
}

.mq-nav { min-width: 0; flex: 1 1 auto; }
.mq-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.mq-nav__list::-webkit-scrollbar { display: none; }
.mq-nav__item { flex: none; }

.mq-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 16px 14px;
  font-size: 15px;
  color: var(--mq-slate);
  white-space: nowrap;
  transition: color 0.16s var(--mq-ease);
}
.mq-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 9px;
  height: 2px;
  background: var(--mq-signal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.18s var(--mq-ease);
}
.mq-nav__link:hover { color: var(--mq-night); }
.mq-nav__link:hover::after { transform: scaleX(1); }
.mq-nav__link[aria-current="page"] {
  color: var(--mq-ice-deep);
  font-weight: 600;
}
.mq-nav__link[aria-current="page"]::after {
  left: 14px;
  right: auto;
  width: 22px;
  transform: scaleX(1);
}
.mq-nav__no {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mq-ice-pale);
  font-variant-numeric: tabular-nums;
}
.mq-nav__link[aria-current="page"] .mq-nav__no { color: var(--mq-signal-deep); }

.mq-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.mq-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--mq-line);
  border-radius: var(--mq-radius);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mq-ice-deep);
  background: var(--mq-snow);
}
.mq-nav-toggle__bars { position: relative; width: 16px; height: 10px; display: block; }
.mq-nav-toggle__bars::before,
.mq-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.18s var(--mq-ease), top 0.18s var(--mq-ease);
}
.mq-nav-toggle__bars::before { top: 0; }
.mq-nav-toggle__bars::after { top: 8px; }
.mq-nav-toggle[aria-expanded="true"] .mq-nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.mq-nav-toggle[aria-expanded="true"] .mq-nav-toggle__bars::after { top: 4px; transform: rotate(-45deg); }

.mq-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}
.mq-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--mq-ice) 0%, var(--mq-signal) 100%);
  transition: width 0.12s linear;
}

/* ---------- 9. 页脚 ---------- */
.mq-footer {
  background: linear-gradient(180deg, #0A4F65 0%, #0B1620 62%, #0B1620 100%);
  color: rgba(220, 233, 240, 0.8);
  font-size: 14px;
  padding-block: clamp(40px, 5vw, 64px) 28px;
  border-top: 1px solid var(--mq-line-dark);
}
.mq-footer a { color: rgba(220, 233, 240, 0.86); transition: color 0.16s var(--mq-ease); }
.mq-footer a:hover { color: var(--mq-snow); }

.mq-footer__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--mq-line-dark);
}
.mq-footer__brand { display: inline-flex; align-items: center; gap: 10px; flex: none; }
.mq-footer__brandname { font-size: 17px; font-weight: 600; letter-spacing: 0.08em; color: var(--mq-snow); }
.mq-footer__tag {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: rgba(220, 233, 240, 0.6);
}

.mq-footer__index { padding-block: 22px 6px; }
.mq-footer__eyebrow {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mq-ice-pale);
  margin-bottom: 10px;
}
.mq-footer__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 14.5px;
}
.mq-footer__list li { position: relative; }
.mq-footer__list li + li::before {
  content: "·";
  position: absolute;
  left: -13px;
  color: rgba(111, 182, 204, 0.5);
}

.mq-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px 32px;
  padding-block: 26px 24px;
  border-top: 1px solid var(--mq-line-dark);
  border-bottom: 1px solid var(--mq-line-dark);
  margin-top: 18px;
}
.mq-footer__col p { line-height: 1.7; }
.mq-footer__col p + p { margin-top: 6px; }
.mq-footer__title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--mq-ice-pale);
  margin-bottom: 10px;
}
.mq-footer__legal { display: flex; flex-direction: column; gap: 7px; }

.mq-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  padding-top: 20px;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: rgba(220, 233, 240, 0.58);
}
.mq-footer__region { color: rgba(111, 182, 204, 0.85); }

/* ---------- 10. 面包屑 ---------- */
.mq-breadcrumb { padding-block: 16px; font-size: 13px; letter-spacing: 0.06em; color: var(--mq-slate); }
.mq-breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.mq-breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }
.mq-breadcrumb li + li::before { content: "/"; color: var(--mq-ice-pale); }
.mq-breadcrumb a:hover { color: var(--mq-ice); }
.mq-breadcrumb [aria-current="page"] { color: var(--mq-night); font-weight: 600; }

/* ---------- 11. 卡片 / 行 / 索引带 ---------- */
.mq-card {
  position: relative;
  display: block;
  background: #FFFFFF;
  border: 1px solid var(--mq-line);
  border-radius: var(--mq-radius);
  padding: 22px;
  transition: transform 0.18s var(--mq-ease), box-shadow 0.18s var(--mq-ease),
              border-color 0.18s var(--mq-ease);
}
.mq-card:hover,
.mq-card:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--mq-shadow-1);
  border-color: var(--mq-ice-pale);
}
.mq-card__time {
  display: block;
  margin-top: 12px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--mq-ice);
  opacity: 0;
  transition: opacity 0.18s var(--mq-ease);
}
.mq-card:hover .mq-card__time,
.mq-card:focus-within .mq-card__time { opacity: 1; }
@media (hover: none) { .mq-card__time { opacity: 1; } }
.mq-section--night .mq-card {
  background: rgba(247, 250, 252, 0.04);
  border-color: var(--mq-line-dark);
}
.mq-section--night .mq-card:hover { border-color: var(--mq-ice-pale); }

.mq-row {
  position: relative;
  display: block;
  padding: 13px 14px 13px 24px;
  border-bottom: 1px solid var(--mq-line-soft);
  transition: background-color 0.18s var(--mq-ease), color 0.18s var(--mq-ease);
}
.mq-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 2px;
  background: var(--mq-signal);
  transform: translateY(-50%);
  transition: width 0.18s var(--mq-ease);
}
.mq-row:hover,
.mq-row:focus-visible { background: rgba(220, 233, 240, 0.42); }
.mq-row:hover::before,
.mq-row:focus-visible::before { width: 14px; }

.mq-index-band {
  display: flex;
  overflow-x: auto;
  border-top: 1px solid var(--mq-line);
  border-bottom: 1px solid var(--mq-line);
  background: var(--mq-snow);
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}
.mq-index-band__item {
  flex: 0 0 auto;
  min-width: 176px;
  padding: 18px 20px;
  border-right: 1px solid var(--mq-line-soft);
  scroll-snap-align: start;
  transition: background-color 0.18s var(--mq-ease);
}
.mq-index-band__item:hover { background: rgba(220, 233, 240, 0.5); }
.mq-index-band__item:last-child { border-right: 0; }

/* ---------- 12. 表格 ---------- */
.mq-table {
  width: 100%;
  border: 1px solid var(--mq-line);
  border-radius: var(--mq-radius);
  background: #FFFFFF;
  font-size: 15px;
  overflow: hidden;
}
.mq-table caption {
  text-align: left;
  padding: 14px 16px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mq-slate);
  border-bottom: 1px solid var(--mq-line);
}
.mq-table th,
.mq-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--mq-line-soft);
}
.mq-table thead th {
  background: var(--mq-frost);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--mq-ice-deep);
}
.mq-table tbody tr:nth-child(even) { background: rgba(220, 233, 240, 0.4); }
.mq-table tbody tr:last-child th,
.mq-table tbody tr:last-child td { border-bottom: 0; }

/* ---------- 13. 标签 ---------- */
.mq-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--mq-line);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mq-ice-deep);
  background: rgba(220, 233, 240, 0.5);
  white-space: nowrap;
}
.mq-tag--ok {
  color: var(--mq-ok);
  border-color: rgba(46, 125, 91, 0.4);
  background: rgba(46, 125, 91, 0.08);
}
.mq-tag--signal {
  color: var(--mq-signal-deep);
  border-color: rgba(255, 122, 26, 0.42);
  background: rgba(255, 122, 26, 0.1);
}

/* ---------- 14. 图片容器（供页面阶段填图） ---------- */
.mq-figure { margin: 0; }
.mq-figure__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--mq-line);
  border-radius: var(--mq-radius);
  background: var(--mq-grad-night);
  aspect-ratio: 16 / 10;
  box-shadow: var(--mq-shadow-1);
}
.mq-figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 12% 8%, rgba(111, 182, 204, 0.34) 0%, rgba(11, 22, 32, 0) 62%);
  pointer-events: none;
}
.mq-figure__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.mq-figure__cap {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mq-slate);
}
.mq-figure--wide .mq-figure__frame { aspect-ratio: 21 / 9; }
.mq-figure--tall .mq-figure__frame { aspect-ratio: 3 / 4; }
.mq-figure--screen .mq-figure__frame {
  aspect-ratio: 4 / 3;
  background: linear-gradient(160deg, #0A4F65 0%, #0E6E8C 58%, #6FB6CC 100%);
}

/* ---------- 15. 返回顶部 ---------- */
.mq-backtop {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 80;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--mq-night);
  color: var(--mq-snow);
  border: 1px solid var(--mq-line-dark);
  font-size: 12px;
  letter-spacing: 0.06em;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.18s var(--mq-ease), transform 0.18s var(--mq-ease);
}
.mq-backtop[data-visible] { opacity: 1; transform: none; pointer-events: auto; }
.mq-backtop:hover { border-color: var(--mq-signal); color: var(--mq-signal); }

/* ---------- 16. 显现动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.42s var(--mq-ease), transform 0.42s var(--mq-ease);
}
[data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1080px) {
  .mq-header__status { display: none; }
  .mq-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mq-col-3, .mq-col-4 { grid-column: span 6; }
  .mq-col-8, .mq-col-9 { grid-column: span 12; }
}

@media (max-width: 900px) {
  :root { --mq-header-h: 62px; }

  .mq-header__hours { margin-left: auto; font-size: 11.5px; }
  .mq-brand__sub { display: none; }

  .mq-header__lower-inner { gap: 10px; }
  .mq-header__cta { display: none; }
  .mq-nav-toggle { display: inline-flex; }

  .mq-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 95;
    flex: 0 0 auto;
    background: var(--mq-snow);
    border-bottom: 1px solid var(--mq-line);
    box-shadow: var(--mq-shadow-2);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 0.24s var(--mq-ease), visibility 0.24s var(--mq-ease);
  }
  .mq-nav[data-open] {
    max-height: min(72vh, 560px);
    overflow-y: auto;
    visibility: visible;
  }
  .mq-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 24px 20px;
    overflow: visible;
  }
  .mq-nav__item { width: 100%; }
  .mq-nav__link {
    display: flex;
    justify-content: space-between;
    padding: 15px 2px;
    font-size: 17px;
    border-bottom: 1px solid var(--mq-line-soft);
  }
  .mq-nav__link::after {
    left: -14px;
    right: auto;
    bottom: auto;
    top: 50%;
    width: 2px;
    height: 18px;
    transform: translateY(-50%) scaleY(0);
    transform-origin: center;
  }
  .mq-nav__link:hover::after { transform: translateY(-50%) scaleY(1); }
  .mq-nav__link[aria-current="page"]::after {
    width: 2px;
    height: 18px;
    transform: translateY(-50%) scaleY(1);
  }

  .mq-axis {
    position: static;
    border-left: 0;
    border-top: 2px solid var(--mq-signal);
    padding-left: 0;
    padding-top: 10px;
  }
  .mq-footer__grid { grid-template-columns: 1fr; gap: 22px; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .mq-shell { padding-inline: 18px; }
  .mq-col-3, .mq-col-4, .mq-col-6 { grid-column: span 12; }
  .mq-card { padding: 18px; }
  .mq-index-band__item { min-width: 148px; padding: 16px; }
  .mq-footer__base { justify-content: flex-start; }
  .mq-backtop { right: 14px; bottom: 14px; width: 42px; height: 42px; }
}

@media (min-width: 901px) {
  .mq-nav[data-open] { max-height: none; visibility: visible; }
}

/* ---------- 18. 减少动态效果 ---------- */
@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;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .mq-backtop { transform: none; }
}