/* ============================================================
   金多宝赛场 · /assets/site.css
   共享外壳：reset / 变量 / 排版 / 页头 / 页脚 / 基础组件
   ============================================================ */

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

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

body {
  margin: 0;
  background-color: #0A1B33;
  color: #F4F7FB;
  font-family: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

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

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

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: #F4F7FB;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink-deep: #0A1B33;
  --ink-night: #132C4C;
  --snow: #F4F7FB;
  --gold: #F2B705;
  --gold-deep: #C68A00;
  --grass: #1FA85C;
  --alert: #FF7A33;
  --mist: #8FA3BF;
  --ice: #4DA3FF;
  --murk: #06121F;

  --font-sans: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --fs-1: 56px;
  --fs-2: 40px;
  --fs-3: 28px;
  --fs-4: 20px;
  --fs-5: 17px;
  --fs-6: 15px;
  --fs-7: 13px;

  --shell: 1280px;
  --gutter: clamp(18px, 4vw, 56px);
  --header-h: 74px;
  --cut: 12px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --line-soft: rgba(143, 163, 191, 0.18);
}

/* ---------- 3. 基础排版与焦点 ---------- */
:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
  border-radius: 2px;
}

.mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: var(--fs-7);
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--gold);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  background: currentColor;
  flex: 0 0 20px;
}

/* main 内容与固定页头之间的安全距离，页面可自行覆盖 */
#main-content { padding-top: var(--header-h); }

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 400;
  padding: 11px 18px;
  background: var(--gold);
  color: var(--murk);
  font-size: var(--fs-6);
  font-weight: 700;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transform: translateY(-220%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 5. 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: linear-gradient(
    180deg,
    rgba(6, 18, 31, 0.95) 0%,
    rgba(6, 18, 31, 0.72) 58%,
    rgba(6, 18, 31, 0) 100%
  );
  transition: background 0.28s var(--ease), box-shadow 0.28s var(--ease),
    backdrop-filter 0.28s var(--ease);
}

.site-header[data-scrolled] {
  background: rgba(10, 27, 51, 0.96);
  box-shadow: 0 1px 0 rgba(242, 183, 5, 0.26), 0 22px 38px -30px rgba(0, 0, 0, 0.95);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.6vw, 40px);
}

/* 品牌锁定 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  padding: 6px 0;
}

.brand-glyph {
  position: relative;
  width: 26px;
  height: 26px;
  flex: 0 0 26px;
  display: block;
}

.brand-glyph i {
  position: absolute;
  top: 0;
  width: 5px;
  height: 100%;
  background: var(--gold);
  transform: skewX(-18deg);
  transition: height 0.24s var(--ease), top 0.24s var(--ease);
}

.brand-glyph i:nth-child(1) { left: 0; }
.brand-glyph i:nth-child(2) { left: 10px; background: var(--grass); height: 82%; top: 9%; }
.brand-glyph i:nth-child(3) { left: 20px; background: var(--ice); height: 60%; top: 20%; }

.brand:hover .brand-glyph i:nth-child(1) { height: 100%; }
.brand:hover .brand-glyph i:nth-child(2) { height: 100%; top: 0; }
.brand:hover .brand-glyph i:nth-child(3) { height: 100%; top: 0; }

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-name {
  font-size: 19px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--snow);
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  line-height: 1.3;
  color: var(--mist);
}

/* 移动端导航按钮 */
.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 10px;
  padding: 9px 13px;
  border: 1px solid rgba(143, 163, 191, 0.38);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

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

.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 18px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--snow);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* 主导航 */
.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 30px);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.9vw, 28px);
}

.nav-list a {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: var(--fs-6);
  font-weight: 500;
  color: rgba(244, 247, 251, 0.78);
  white-space: nowrap;
  transition: color 0.18s var(--ease);
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 3px;
  width: 0;
  height: 2px;
  background: var(--gold);
  transition: width 0.22s var(--ease), background 0.18s var(--ease);
}

.nav-list a:hover { color: var(--snow); }
.nav-list a:hover::after { width: 100%; }

.nav-list a[aria-current="page"] {
  color: var(--snow);
  font-weight: 700;
}

.nav-list a[aria-current="page"]::after {
  width: 100%;
  background: var(--gold);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 17px;
  background: var(--gold);
  color: var(--murk);
  font-size: var(--fs-7);
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.nav-cta::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--murk);
  transform: rotate(45deg);
  flex: 0 0 7px;
  transition: background 0.18s var(--ease);
}

.nav-cta:hover {
  background: var(--gold-deep);
  color: var(--snow);
}

.nav-cta:hover::before { background: var(--snow); }

/* 滚动进度条（由 JS 注入） */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(143, 163, 191, 0.16);
  overflow: hidden;
  pointer-events: none;
}

.scroll-meter-fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--grass) 0%, var(--gold) 70%, var(--gold-deep) 100%);
  transition: width 0.1s linear;
}

/* ---------- 6. 页面骨架工具 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(20px, 3.6vw, 64px);
  align-items: start;
}

.col-rail { grid-column: 1; min-width: 0; }
.col-main { grid-column: 2; min-width: 0; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 26px;
  padding-bottom: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-7);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.breadcrumb a { transition: color 0.18s var(--ease); }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb-sep { color: rgba(143, 163, 191, 0.5); }

.prose {
  max-width: 46rem;
  font-size: var(--fs-5);
  line-height: 1.75;
  color: rgba(244, 247, 251, 0.86);
}

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

.prose h2 {
  font-size: var(--fs-3);
  margin-top: 1.9em;
  color: var(--snow);
}

.prose h3 {
  font-size: var(--fs-4);
  margin-top: 1.5em;
  color: var(--snow);
}

.prose strong { color: var(--snow); font-weight: 700; }

.prose a {
  color: var(--ice);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(77, 163, 255, 0.45);
  transition: color 0.18s var(--ease), text-decoration-color 0.18s var(--ease);
}

.prose a:hover {
  color: var(--gold);
  text-decoration-color: var(--gold-deep);
}

.prose ul {
  display: grid;
  gap: 0.5em;
}

.prose ul li {
  position: relative;
  padding-left: 1.35em;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--gold);
}

/* ---------- 7. 装饰语言：斜向切片 ---------- */
.slice-band {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px clamp(12px, 2vw, 26px);
  margin: clamp(28px, 5vw, 62px) 0;
  padding: 15px clamp(16px, 2.6vw, 32px);
  background:
    repeating-linear-gradient(
      115deg,
      rgba(242, 183, 5, 0.13) 0 2px,
      rgba(242, 183, 5, 0) 2px 16px
    ),
    linear-gradient(96deg, rgba(19, 44, 76, 0.94) 0%, rgba(10, 27, 51, 0.62) 58%, rgba(6, 18, 31, 0.92) 100%);
  clip-path: polygon(0 13px, 100% 0, 100% calc(100% - 13px), 0 100%);
  font-family: var(--font-mono);
  font-size: var(--fs-7);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.slice-band b {
  color: var(--gold);
  font-weight: 600;
}

/* ---------- 8. 组件：切角面板 ---------- */
.cut-card {
  position: relative;
  display: block;
  background: var(--ink-night);
  border: 1px solid var(--line-soft);
  padding: clamp(18px, 2.4vw, 28px);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.cut-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 26px;
  background: var(--gold);
  transition: height 0.24s var(--ease);
}

.cut-card:hover {
  background: #17324f;
  border-color: rgba(242, 183, 5, 0.32);
}

.cut-card:hover::before { height: 62px; }

.cut-card--grass::before { background: var(--grass); }
.cut-card--grass:hover { border-color: rgba(31, 168, 92, 0.36); }

.cut-card--alert::before { background: var(--alert); }
.cut-card--alert:hover { border-color: rgba(255, 122, 51, 0.36); }

.cut-card__meta {
  position: absolute;
  top: 16px;
  right: 22px;
  font-family: var(--font-mono);
  font-size: var(--fs-7);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 9. 组件：状态标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--mist);
  border: 1px solid rgba(143, 163, 191, 0.34);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
}

.tag--gold { color: var(--gold); border-color: rgba(242, 183, 5, 0.5); }
.tag--grass { color: var(--grass); border-color: rgba(31, 168, 92, 0.5); }
.tag--alert { color: var(--alert); border-color: rgba(255, 122, 51, 0.5); }

/* ---------- 10. 组件：按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  font-size: var(--fs-6);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.4;
  border: 1px solid transparent;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.btn--gold {
  background: var(--gold);
  color: var(--murk);
}
.btn--gold:hover {
  background: var(--snow);
  color: var(--murk);
}

.btn--ghost {
  background: transparent;
  color: var(--snow);
  border-color: rgba(143, 163, 191, 0.46);
}
.btn--ghost:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.btn--grass {
  background: var(--grass);
  color: #04150c;
}
.btn--grass:hover {
  background: #26c46d;
  color: #04150c;
}

/* ---------- 11. 组件：图片容器 ---------- */
.figure-frame {
  position: relative;
  margin: 0;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(140deg, var(--ink-night) 0%, var(--murk) 100%);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.figure-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.06);
}

.figure-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(10, 27, 51, 0.1) 0%, rgba(6, 18, 31, 0.5) 100%);
  pointer-events: none;
}

.figure-frame > figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 16px 18px 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-7);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: rgba(244, 247, 251, 0.86);
  background: linear-gradient(180deg, rgba(6, 18, 31, 0) 0%, rgba(6, 18, 31, 0.88) 100%);
}

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

.img-ph {
  display: grid;
  place-items: center;
  gap: 8px;
  width: 100%;
  height: 100%;
  padding: 20px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--fs-7);
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* ---------- 12. 返回顶部（由 JS 注入） ---------- */
.to-top {
  position: fixed;
  right: clamp(14px, 2.4vw, 32px);
  bottom: clamp(14px, 2.4vw, 32px);
  z-index: 180;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(10, 27, 51, 0.94);
  border: 1px solid rgba(242, 183, 5, 0.44);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: var(--fs-7);
  font-weight: 600;
  letter-spacing: 0.1em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s linear,
    background 0.18s var(--ease), color 0.18s var(--ease);
}

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

.to-top:hover {
  background: var(--gold);
  color: var(--murk);
}

/* ---------- 13. 滚动显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  padding-bottom: 28px;
  background: var(--murk);
  color: var(--snow);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(
    90deg,
    var(--gold) 0%,
    var(--gold) 18%,
    var(--grass) 18%,
    var(--grass) 36%,
    var(--ice) 36%,
    var(--ice) 50%,
    var(--gold-deep) 50%,
    var(--gold-deep) 62%,
    rgba(143, 163, 191, 0.35) 62%,
    rgba(143, 163, 191, 0.35) 100%
  );
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(42px, 6vw, 76px) var(--gutter) 0;
  display: grid;
  grid-template-columns: minmax(230px, 1.5fr) repeat(4, minmax(0, 1fr));
  gap: clamp(26px, 3.4vw, 52px);
}

.footer-brand-name {
  display: block;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.25;
  color: var(--snow);
}

.footer-brand-line {
  margin-top: 10px;
  max-width: 30ch;
  font-size: var(--fs-6);
  line-height: 1.7;
  color: var(--mist);
}

.footer-brand-since {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(143, 163, 191, 0.7);
}

.footer-contact {
  margin-top: 22px;
  display: grid;
  gap: 9px;
}

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

.footer-contact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.footer-contact dd {
  margin: 0;
  font-size: var(--fs-7);
  line-height: 1.65;
  color: rgba(244, 247, 251, 0.88);
  word-break: break-word;
}

.footer-col h3 {
  position: relative;
  padding-bottom: 12px;
  margin-bottom: 15px;
  border-bottom: 1px solid var(--line-soft);
  font-size: var(--fs-7);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.footer-col h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 28px;
  height: 2px;
  background: var(--gold);
}

.footer-col--anchor h3::after {
  width: 44px;
  background: var(--grass);
}

.footer-col li + li { margin-top: 9px; }

.footer-col a {
  position: relative;
  display: inline-block;
  padding-left: 0;
  font-size: var(--fs-6);
  color: rgba(244, 247, 251, 0.78);
  transition: color 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.footer-col a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--gold);
  transition: width 0.18s var(--ease);
}

.footer-col a:hover {
  color: var(--gold);
  padding-left: 16px;
}

.footer-col a:hover::before { width: 11px; }

.footer-base {
  max-width: var(--shell);
  margin: clamp(32px, 5vw, 58px) auto 0;
  padding: 20px var(--gutter) 0;
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  font-size: var(--fs-7);
  color: var(--mist);
}

.footer-base-sep {
  width: 18px;
  height: 2px;
  background: rgba(242, 183, 5, 0.6);
  flex: 0 0 18px;
}

.footer-base-note {
  margin-left: auto;
  color: rgba(143, 163, 191, 0.82);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    left: auto;
    width: min(360px, 88vw);
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 24px var(--gutter) 42px;
    background: rgba(6, 18, 31, 0.98);
    border-left: 1px solid rgba(242, 183, 5, 0.22);
    overflow-y: auto;
    transform: translateX(102%);
    visibility: hidden;
    transition: transform 0.28s var(--ease), visibility 0.28s linear;
  }

  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
  }

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

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

  .nav-list a {
    display: block;
    padding: 15px 0;
    font-size: var(--fs-5);
  }

  .nav-list a::after {
    left: 0;
    bottom: 10px;
    height: 2px;
    width: 0;
  }

  .nav-list a[aria-current="page"]::after { width: 30px; }

  .nav-cta {
    justify-content: center;
    margin-top: 26px;
    padding: 15px 20px;
    font-size: var(--fs-6);
  }

  .split {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(24px, 4vw, 44px);
  }

  .col-rail,
  .col-main { grid-column: 1; }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px;
  }

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

@media (max-width: 720px) {
  :root { --header-h: 62px; }

  body { font-size: 16px; }

  .brand-tagline { display: none; }
  .brand-name { font-size: 17px; }
  .brand-glyph { width: 22px; height: 22px; flex: 0 0 22px; }
  .brand-glyph i { width: 4px; }
  .brand-glyph i:nth-child(2) { left: 8px; }
  .brand-glyph i:nth-child(3) { left: 16px; }

  .nav-toggle-text { display: none; }

  .figure-frame,
  .figure-frame--wide { aspect-ratio: 16 / 10; }

  .slice-band { font-size: 12px; letter-spacing: 0.06em; }

  .footer-base { flex-direction: column; align-items: flex-start; gap: 8px; }
  .footer-base-note { margin-left: 0; }
  .footer-base-sep { display: none; }

  .to-top { padding: 9px 12px; letter-spacing: 0.06em; }
}

@media (max-width: 560px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 16. 无动画偏好 ---------- */
@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;
  }

  [data-reveal],
  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}