/* =========================================================
   乐鱼赛场 · 共享站点样式 /assets/site.css
   夜场泳道 × 电子记分牌
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(74px + 16px);
}

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

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

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

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

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

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

::selection { background: #2DE2C5; color: #021A24; }

/* ---------- 2. 变量 ---------- */
:root {
  --deep: #062A3A;
  --lane: #0B3B52;
  --cyan: #2DE2C5;
  --orange: #FF8A3D;
  --yellow: #FFD166;
  --paper: #F4FBFC;
  --mist: #C9E4EA;
  --steel: #8FB9C7;
  --ink: #021A24;
  --danger: #FF5A5F;

  --line: rgba(143, 185, 199, .28);
  --line-soft: rgba(143, 185, 199, .16);
  --line-cyan: rgba(45, 226, 197, .42);
  --grid-line: rgba(45, 226, 197, .10);

  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-cond: "Oswald", "Noto Sans SC Condensed", "Arial Narrow", "PingFang SC", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 1200px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 74px;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--deep);
  background-image:
    repeating-linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(180deg, rgba(45, 226, 197, .05) 0 1px, transparent 1px 96px);
  background-attachment: fixed;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-cond);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: .02em;
  color: var(--paper);
}

h1 { font-size: clamp(34px, 4.6vw, 56px); }
h2 { font-size: clamp(26px, 3.2vw, 38px); }
h3 { font-size: clamp(19px, 2vw, 24px); }

p { max-width: 68ch; }

strong { color: var(--cyan); font-weight: 700; }

small { font-size: 13px; color: var(--steel); }

/* ---------- 4. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 96px); }

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--line-cyan), var(--line-soft) 40%, transparent);
  margin-block: clamp(20px, 3vw, 34px);
}

/* ---------- 5. 文字工具 ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--steel);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--orange);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: clamp(12px, 2vw, 32px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(22px, 3vw, 38px);
}

.section-title {
  font-family: var(--font-cond);
  font-size: clamp(24px, 3vw, 36px);
  letter-spacing: .04em;
  color: var(--paper);
}

.section-sub {
  font-size: 14.5px;
  color: var(--steel);
  max-width: 52ch;
}

.lede {
  font-size: clamp(15.5px, 1.5vw, 17.5px);
  line-height: 1.85;
  color: var(--mist);
  max-width: 60ch;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .08em;
  line-height: 1.2;
  cursor: pointer;
  background: none;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.btn-solid {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.btn-solid:hover,
.btn-solid:focus-visible {
  background: var(--paper);
  border-color: var(--paper);
  color: var(--ink);
}

.btn-ghost {
  background: rgba(45, 226, 197, .06);
  border-color: rgba(45, 226, 197, .5);
  color: var(--paper);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: rgba(45, 226, 197, .16);
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn-orange {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.btn-orange:hover,
.btn-orange:focus-visible {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--ink);
}

/* ---------- 7. 标签与数据 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
  background: rgba(11, 59, 82, .5);
}

.tag-cyan { border-color: rgba(45, 226, 197, .55); color: var(--cyan); background: rgba(45, 226, 197, .1); }
.tag-orange { border-color: rgba(255, 138, 61, .55); color: var(--orange); background: rgba(255, 138, 61, .1); }
.tag-yellow { border-color: rgba(255, 209, 102, .55); color: var(--yellow); background: rgba(255, 209, 102, .12); }

.kpi {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 12px;
  border-left: 2px solid var(--line-cyan);
}

.kpi-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.kpi-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--steel);
}

.data-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.data-num--orange { color: var(--orange); }
.data-num--cyan { color: var(--cyan); }

/* ---------- 8. 档案卡 ---------- */
.lane-card {
  position: relative;
  background:
    repeating-linear-gradient(90deg, rgba(45, 226, 197, .05) 0 1px, transparent 1px 56px),
    var(--lane);
  border: 1px solid var(--line);
  padding: clamp(16px, 2vw, 26px);
  color: var(--mist);
  border-radius: 0;
}

.lane-card::before,
.lane-card::after {
  content: "";
  position: absolute;
  width: 13px;
  height: 13px;
  pointer-events: none;
}

.lane-card::before {
  top: -1px; left: -1px;
  border-top: 2px solid var(--cyan);
  border-left: 2px solid var(--cyan);
}

.lane-card::after {
  bottom: -1px; right: -1px;
  border-bottom: 2px solid var(--cyan);
  border-right: 2px solid var(--cyan);
}

.lane-card--light {
  background: var(--paper);
  border-color: rgba(6, 42, 58, .16);
  color: var(--deep);
}

.lane-card--light .lane-card-title { color: var(--deep); }

.lane-card-title {
  font-family: var(--font-cond);
  font-size: 18px;
  letter-spacing: .05em;
  color: var(--paper);
  margin-bottom: 8px;
}

/* ---------- 9. 索引列表 ---------- */
.index-list {
  border-top: 1px solid var(--line-soft);
}

.index-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  color: var(--mist);
}

.index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--orange);
  min-width: 2.4em;
}

/* ---------- 10. 图片容器（页面阶段放占位） ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink);
  border-radius: 0;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    repeating-linear-gradient(115deg, rgba(45, 226, 197, .16) 0 1px, transparent 1px 24px),
    radial-gradient(120% 90% at 10% 6%, rgba(45, 226, 197, .22), transparent 62%),
    linear-gradient(180deg, rgba(11, 59, 82, .92), rgba(2, 26, 36, .96));
}

.media-frame > img,
.media-frame > svg,
.media-frame > picture {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

/* ---------- 11. 面包屑 ---------- */
.breadcrumb {
  padding-block: 14px;
  border-bottom: 1px solid var(--line-soft);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--steel);
}

.breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(143, 185, 199, .5);
}

.breadcrumb-list a {
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

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

/* ---------- 12. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 12px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  transition: top .18s ease;
}

.skip-link:focus {
  top: 12px;
}

/* ---------- 13. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  color: var(--paper);
  background: linear-gradient(180deg, rgba(2, 26, 36, .96) 0%, rgba(6, 42, 58, .80) 68%, rgba(6, 42, 58, .58) 100%);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(45, 226, 197, .18);
  transition: box-shadow .28s ease, border-color .28s ease, background-color .28s ease;
}

.site-header[data-scrolled="true"] {
  background: var(--deep);
  border-bottom-color: var(--line-cyan);
  box-shadow: 0 22px 46px -34px #000;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 26px);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--header-h);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  color: var(--paper);
}

.brand-marker {
  display: inline-flex;
  align-items: flex-end;
  gap: 3px;
  height: 28px;
  padding-right: 11px;
  border-right: 1px solid var(--line-cyan);
}

.lane-bar {
  display: block;
  width: 3px;
  background: var(--cyan);
}

.lane-bar:nth-child(1) { height: 10px; opacity: .5; }
.lane-bar:nth-child(2) { height: 18px; opacity: .8; }
.lane-bar:nth-child(3) { height: 28px; background: var(--orange); }

.brand-text { display: block; }

.brand-name {
  display: block;
  font-family: var(--font-cond);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .16em;
  line-height: 1.05;
  color: var(--paper);
}

.brand-sub {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--steel);
}

/* 导航 */
.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(6px, 1.3vw, 20px);
}

.nav-item { position: relative; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 2px;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--mist);
  white-space: nowrap;
  transition: color .18s ease;
}

.nav-idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--steel);
  transition: color .18s ease;
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--cyan); }

.nav-link:hover .nav-idx,
.nav-link:focus-visible .nav-idx { color: var(--orange); }

.nav-link[aria-current="page"] { color: var(--paper); }

.nav-link[aria-current="page"] .nav-idx { color: var(--orange); }

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--cyan);
}

/* 移动端面板内附加区（桌面隐藏） */
.nav-extra { display: none; }

.nav-extra-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--steel);
  margin-bottom: 12px;
}

.nav-extra-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav-extra-actions .btn { flex: 1 1 auto; }

/* 右侧工具条 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.version-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 9px;
  border: 1px solid rgba(255, 138, 61, .45);
  background: rgba(255, 138, 61, .08);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.version-chip-k { font-size: 9px; color: var(--steel); letter-spacing: .18em; }
.version-chip-v { color: var(--orange); font-variant-numeric: tabular-nums; }

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 10px 12px;
  background: rgba(6, 42, 58, .7);
  border: 1px solid rgba(45, 226, 197, .35);
  color: var(--paper);
  cursor: pointer;
  border-radius: 0;
}

.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 17px;
  height: 14px;
}

.nav-toggle-bar {
  display: block;
  width: 17px;
  height: 2px;
  background: var(--cyan);
  transition: transform .2s ease, opacity .2s ease;
}

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.site-header[data-open="true"] .nav-toggle-bar:first-child {
  transform: translateY(3px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle-bar:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

/* 滚动进度 */
.header-progress {
  display: block;
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--yellow));
  transition: width .12s linear;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(90deg, rgba(45, 226, 197, .07) 0 1px, transparent 1px 88px),
    linear-gradient(180deg, rgba(11, 59, 82, .55), transparent 46%);
  color: var(--mist);
  border-top: 1px solid var(--line-cyan);
}

.footer-scan {
  display: block;
  height: 62px;
  background-image:
    repeating-linear-gradient(90deg, rgba(45, 226, 197, .22) 0 2px, transparent 2px 14px),
    linear-gradient(180deg, rgba(45, 226, 197, .18), transparent 82%);
  opacity: .55;
  pointer-events: none;
}

.footer-inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.5fr .85fr 1.35fr .9fr;
  gap: clamp(22px, 3vw, 46px);
  padding-block: clamp(26px, 3.4vw, 46px) clamp(28px, 3.6vw, 50px);
}

.footer-brandcol { min-width: 0; }

.footer-brand {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--cyan);
}

.footer-brand-name {
  font-family: var(--font-cond);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--paper);
}

.footer-brand-sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--steel);
}

.footer-note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
  max-width: 34ch;
}

.footer-feedback {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
  padding: 12px 14px;
  border: 1px solid rgba(255, 138, 61, .5);
  background: rgba(255, 138, 61, .09);
  transition: background-color .18s ease, border-color .18s ease;
}

.footer-feedback:hover,
.footer-feedback:focus-visible {
  background: rgba(255, 138, 61, .2);
  border-color: var(--orange);
}

.footer-feedback-k {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .2em;
  color: var(--orange);
}

.footer-feedback-t {
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--paper);
}

.footer-feedback-a {
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--orange);
}

.footer-col { min-width: 0; }

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.footer-list li + li { margin-top: 8px; }

.footer-list a {
  font-size: 14px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--cyan);
}

.contact-list { display: grid; gap: 12px; }

.contact-row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.contact-key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--steel);
  padding-top: 2px;
}

.contact-val {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
  word-break: break-word;
}

.contact-val--num {
  font-family: var(--font-mono);
  letter-spacing: .02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.data-list { display: grid; gap: 0; border-top: 1px solid var(--line-soft); }

.data-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line-soft);
}

.data-row dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--steel);
}

.footer-legal {
  border-top: 1px solid var(--line-soft);
  background: rgba(2, 26, 36, .6);
}

.footer-legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 16px var(--gutter);
}

.legal-copy {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--steel);
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 12.5px;
  color: var(--steel);
}

.legal-links a {
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

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

/* ---------- 15. 焦点与可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.site-footer :focus-visible { outline-color: var(--yellow); }

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1180px) {
  .version-chip { display: none; }
  .nav-list { gap: 8px; }
  .nav-link { font-size: 13.5px; }
}

@media (max-width: 1024px) {
  .header-actions { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    background-color: var(--ink);
    background-image:
      repeating-linear-gradient(90deg, rgba(45, 226, 197, .08) 0 1px, transparent 1px 72px);
    border-top: 1px solid var(--line-soft);
    border-bottom: 1px solid var(--line-cyan);
    padding: 0 var(--gutter);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
    transition: opacity .22s ease, transform .22s ease, visibility .22s ease;
  }

  .site-header[data-open="true"] .site-nav {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 4px;
  }

  .nav-item { border-bottom: 1px solid var(--line-soft); }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 15px 4px;
    font-size: 16px;
    letter-spacing: .06em;
  }

  .nav-link[aria-current="page"] { background: rgba(45, 226, 197, .08); }

  .nav-link[aria-current="page"]::after {
    left: 0;
    right: auto;
    bottom: auto;
    top: 50%;
    width: 3px;
    height: 22px;
    transform: translateY(-50%);
  }

  .nav-extra {
    display: block;
    padding: 18px 0 24px;
    border-top: 1px dashed var(--line);
  }

  .footer-main { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brandcol { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .grid-2,
  .grid-3 { grid-template-columns: minmax(0, 1fr); }

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

  .span-3, .span-4, .span-5, .span-6,
  .span-7, .span-8, .span-9 { grid-column: auto; }

  .section-head { align-items: flex-start; }
}

@media (max-width: 720px) {
  .brand-sub { display: none; }
  .footer-main { grid-template-columns: minmax(0, 1fr); }
  .footer-legal-inner { flex-direction: column; align-items: flex-start; }
  .footer-scan { height: 42px; }
}

@media (max-width: 420px) {
  .brand-name { font-size: 18px; letter-spacing: .12em; }
  .nav-toggle-label { display: none; }
  .contact-row { grid-template-columns: minmax(0, 1fr); gap: 2px; }
}

/* ---------- 17. 动效偏好 ---------- */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .header-progress { transition: none; }
  .site-nav { transition: none; }
}