/* ============================================================
   duiju-doudizhu.com.cn — 全站共享样式 /assets/site.css
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h, 76px) + 16px);
}

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

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

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

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

a { color: inherit; }

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

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 3px solid var(--neon);
  outline-offset: 3px;
  border-radius: 8px;
}

/* ---------- 2. Tokens ---------- */
:root {
  /* 色彩 */
  --ink: #0F2A22;
  --ink-deep: #0A1E18;
  --ink-soft: #16382D;
  --paper: #F5EFE2;
  --paper-raise: #FFFDF7;
  --paper-warm: #EDE4D1;
  --red: #C8102E;
  --red-dark: #8E0B21;
  --gold: #D9A441;
  --gold-soft: #F0DCA8;
  --black: #14181A;
  --grey: #4A6B5F;
  --grass: #1F7A5A;
  --neon: #5ECFC0;

  /* 形状 */
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --radius-pill: 999px;

  /* 版面 */
  --wrap: 1180px;
  --wrap-narrow: 860px;
  --wrap-wide: 1380px;
  --gutter: clamp(18px, 4vw, 44px);
  --header-h: 76px;

  /* 字体 */
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-head: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-num: "JetBrains Mono", "SFMono-Regular", "Cascadia Mono", Consolas, Menlo, "Courier New", monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --shadow-card: 0 20px 44px -34px rgba(15, 42, 34, .62);
  --shadow-float: 0 28px 52px -34px rgba(15, 42, 34, .58);
}

/* ---------- 3. 基座与中文排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--black);
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 92% -12%, rgba(217, 164, 65, .17), transparent 46%),
    radial-gradient(circle at -8% 22%, rgba(31, 122, 90, .10), transparent 44%);
  background-repeat: no-repeat;
  min-height: 100vh;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.24;
  color: var(--ink);
  text-wrap: balance;
}

h1 { font-size: clamp(30px, 4.6vw, 46px); letter-spacing: -.015em; }
h2 { font-size: clamp(24px, 3.2vw, 34px); letter-spacing: -.01em; }
h3 { font-size: clamp(18px, 2.1vw, 22px); }
h4 { font-size: 17px; }

p { text-wrap: pretty; }

.display {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.16;
  color: var(--ink);
}

.u-num,
.stat__value,
.num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: -.01em;
}

strong, b { font-weight: 700; }

/* ---------- 4. 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: var(--wrap-narrow); }
.wrap--wide { max-width: var(--wrap-wide); }

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(28px, 4vw, 52px); }

.section--ink,
.on-dark {
  background-color: var(--ink);
  color: rgba(245, 239, 226, .82);
}
.section--ink :is(h1, h2, h3, h4),
.on-dark :is(h1, h2, h3, h4) { color: var(--paper); }

.on-dark .display { color: var(--paper); }
.on-dark .lede { color: rgba(245, 239, 226, .72); }
.on-dark .eyebrow { color: var(--gold); }
.on-dark a { color: var(--gold); }

.grid {
  display: grid;
  gap: clamp(18px, 2.5vw, 30px);
}
.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)); }
.grid--sidebar { grid-template-columns: minmax(200px, 262px) minmax(0, 1fr); }

.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-12 { grid-column: span 12; }

/* ---------- 5. 通用文字件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  flex: 0 0 auto;
}

.lede {
  font-size: clamp(16px, 1.55vw, 18px);
  line-height: 1.82;
  color: var(--grey);
  max-width: 64ch;
}

.prose { max-width: 68ch; }
.prose p + p { margin-top: 1em; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  font-size: 12.5px;
  letter-spacing: .08em;
  line-height: 1.6;
  background: var(--gold-soft);
  color: #6B4F12;
  border: 1px solid rgba(217, 164, 65, .5);
  white-space: nowrap;
}
.tag--red {
  background: rgba(200, 16, 46, .09);
  color: var(--red-dark);
  border-color: rgba(200, 16, 46, .34);
}
.tag--ink {
  background: var(--ink-soft);
  color: var(--gold-soft);
  border-color: transparent;
}
.tag--green {
  background: rgba(31, 122, 90, .12);
  color: var(--grass);
  border-color: rgba(31, 122, 90, .34);
}

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, rgba(217, 164, 65, .7), rgba(15, 42, 34, .1) 62%, transparent);
  margin-block: clamp(22px, 3vw, 36px);
}
.on-dark .rule {
  background: linear-gradient(90deg, rgba(217, 164, 65, .8), rgba(245, 239, 226, .12) 62%, transparent);
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-head);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .2s var(--ease), background-color .22s, color .22s, border-color .22s, box-shadow .22s;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--red);
  color: #FFF6F1;
  border-color: var(--red-dark);
  box-shadow: 0 12px 24px -16px rgba(200, 16, 46, 1);
}
.btn--primary:hover { background: var(--red-dark); }

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(217, 164, 65, .58);
}
.btn--ghost:hover {
  background: rgba(217, 164, 65, .14);
  border-color: var(--gold);
}

.btn--gold {
  background: var(--gold);
  color: var(--ink);
  border-color: #B5842C;
  box-shadow: 0 12px 26px -18px rgba(180, 132, 44, 1);
}
.btn--gold:hover { background: var(--gold-soft); }

.btn--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: rgba(15, 42, 34, .18);
}
.btn--paper:hover { background: #FFFDF7; border-color: rgba(217, 164, 65, .8); }

.btn--block { width: 100%; }

/* ---------- 7. 卡片 / 指标 / 图片框 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border-radius: var(--radius-lg);
  background: var(--paper-raise);
  border: 1px solid rgba(15, 42, 34, .10);
  box-shadow: var(--shadow-card);
  transition: transform .22s var(--ease), border-color .22s, box-shadow .22s;
}
.card:hover {
  transform: translateY(-2px);
  border-color: rgba(217, 164, 65, .78);
  box-shadow: var(--shadow-float);
}
.card--ink {
  background: var(--ink);
  border-color: rgba(217, 164, 65, .24);
  color: rgba(245, 239, 226, .8);
}
.card--ink :is(h2, h3, h4) { color: var(--paper); }
.card--flat { box-shadow: none; }
.card--flat:hover { transform: none; box-shadow: none; }
.card--offset { transform: translateY(-14px); }
.card--offset:hover { transform: translateY(-16px); }

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat__value {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--red);
}
.on-dark .stat__value,
.card--ink .stat__value { color: var(--gold); }
.stat__label {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--grey);
}
.on-dark .stat__label,
.card--ink .stat__label { color: rgba(245, 239, 226, .6); }

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background:
    linear-gradient(142deg, rgba(217, 164, 65, .30), rgba(94, 207, 192, .16) 58%, rgba(15, 42, 34, .9)),
    var(--ink);
  border: 1px solid rgba(217, 164, 65, .28);
}
.media-frame > img,
.media-frame > svg,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--grey);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb li:not(:last-child)::after {
  content: "／";
  color: rgba(74, 107, 95, .48);
}
.breadcrumb a {
  color: var(--grey);
  text-decoration: none;
  transition: color .2s;
}
.breadcrumb a:hover { color: var(--red); }
.breadcrumb [aria-current="page"] { color: var(--ink); font-weight: 700; }
.on-dark .breadcrumb,
.on-dark .breadcrumb a { color: rgba(245, 239, 226, .62); }
.on-dark .breadcrumb [aria-current="page"] { color: var(--gold); }

/* ---------- 9. 折叠面板基础 ---------- */
.accordion {
  border-radius: var(--radius-md);
  border: 1px solid rgba(15, 42, 34, .12);
  background: var(--paper-raise);
  overflow: hidden;
}
.accordion + .accordion { margin-top: 12px; }
.accordion__trigger {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: background-color .2s;
}
.accordion__trigger:hover { background: rgba(240, 220, 168, .35); }
.accordion__trigger::after {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--red);
  border-bottom: 2px solid var(--red);
  transform: rotate(45deg) translateY(-2px);
  transition: transform .28s var(--ease);
}
.accordion[data-open] .accordion__trigger::after { transform: rotate(225deg) translateY(-2px); }
.accordion__panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height .34s var(--ease);
}
.accordion[data-open] .accordion__panel { max-height: 640px; }
.accordion__panel > * {
  padding-inline: 20px;
}
.accordion__panel > *:last-child { padding-bottom: 18px; }

/* ---------- 10. 页头 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform .22s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 1px solid rgba(217, 164, 65, .24);
  transition: background-color .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease);
}

.site-header--overlay {
  background: transparent;
  border-bottom-color: transparent;
}
.site-header--overlay.is-stuck {
  background: var(--ink);
  border-bottom-color: rgba(217, 164, 65, .34);
  box-shadow: 0 16px 38px -26px rgba(0, 0, 0, .85);
}

.site-header__inner {
  position: relative;
  max-width: var(--wrap-wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 18px;
}

.site-header__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--red), var(--gold) 72%, var(--neon));
  pointer-events: none;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  flex: 0 0 auto;
}
.brand__chip {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 32% 26%, var(--gold-soft), var(--gold) 58%, #A87A28 100%);
  box-shadow:
    inset 0 0 0 3px rgba(15, 42, 34, .88),
    0 6px 16px -10px rgba(0, 0, 0, .9);
  color: var(--ink);
  flex: 0 0 auto;
}
.brand__pip {
  font-size: 18px;
  line-height: 1;
  transform: translateY(-1px);
}
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}
.brand__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: .02em;
  color: inherit;
}
.brand__tagline {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--gold);
  white-space: nowrap;
}

/* 导航 */
.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.site-nav__list a {
  display: inline-block;
  padding: 8px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 14.5px;
  font-weight: 500;
  line-height: 1.5;
  color: rgba(245, 239, 226, .78);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s, background-color .2s, border-color .2s;
}
.site-nav__list a:hover {
  color: var(--gold);
  border-color: rgba(217, 164, 65, .48);
}
.site-nav__list a[aria-current="page"] {
  background: var(--red);
  color: #FFF6F1;
  border-color: var(--red-dark);
  font-weight: 700;
  box-shadow: 0 8px 20px -14px rgba(200, 16, 46, 1);
}
.site-nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  background: rgba(245, 239, 226, .08);
  border: 1px solid rgba(217, 164, 65, .48);
  color: var(--paper);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color .2s, border-color .2s;
}
.nav-toggle:hover { background: rgba(217, 164, 65, .16); border-color: var(--gold); }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
}
.nav-toggle__bars i {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--gold);
  transition: transform .26s var(--ease), opacity .2s;
}
.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); }

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: rgba(245, 239, 226, .78);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red), var(--gold) 46%, var(--neon));
  opacity: .9;
}
.site-footer::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -170px;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(94, 207, 192, .15), transparent 68%);
  pointer-events: none;
}

.site-footer__inner {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(46px, 6.5vw, 78px) var(--gutter) clamp(30px, 4vw, 46px);
  display: grid;
  grid-template-columns: minmax(250px, 1fr) minmax(0, 1.85fr);
  gap: clamp(32px, 5vw, 72px);
}

.site-footer__brand .brand { margin-bottom: 18px; }
.site-footer__brand .brand__name { color: var(--paper); font-size: 20px; }

.footer-note {
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(245, 239, 226, .62);
  max-width: 36ch;
}

.footer-contact {
  margin-top: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-contact li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}
.footer-contact__k {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
  flex: 0 0 auto;
  min-width: 4.6em;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px dashed rgba(94, 207, 192, .42);
  background: rgba(94, 207, 192, .06);
  color: rgba(245, 239, 226, .86);
  font-family: var(--font-num);
  font-size: 13.5px;
  letter-spacing: .01em;
  cursor: pointer;
  transition: background-color .2s, border-color .2s, color .2s;
}
.copy-btn:hover {
  background: rgba(94, 207, 192, .14);
  border-color: var(--neon);
  color: #FFFFFF;
}
.copy-btn__hint {
  font-family: var(--font-head);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--neon);
  opacity: .8;
}
.copy-btn.is-copied {
  border-style: solid;
  border-color: var(--gold);
  background: rgba(217, 164, 65, .16);
}
.copy-btn.is-copied .copy-btn__hint { color: var(--gold-soft); }

.footer-address {
  margin-top: 14px;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(245, 239, 226, .5);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px 24px;
}

.footer-col__title {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--gold);
  margin-bottom: 16px;
  padding-bottom: 11px;
  border-bottom: 1px solid rgba(217, 164, 65, .26);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col__list a,
.footer-col__list span {
  display: inline-block;
  font-size: 14.5px;
  line-height: 1.6;
  color: rgba(245, 239, 226, .7);
  text-decoration: none;
}
.footer-col__list a { transition: color .2s, padding-left .22s var(--ease); }
.footer-col__list a:hover { color: var(--gold); padding-left: 7px; }

.footer-col__list--index span {
  position: relative;
  padding-left: 16px;
  color: rgba(245, 239, 226, .54);
}
.footer-col__list--index span::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(217, 164, 65, .7);
}

.site-footer__legal {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(245, 239, 226, .12);
  background: rgba(10, 30, 24, .55);
}
.site-footer__legal-inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 20px var(--gutter) 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
}
.site-footer__copy {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .03em;
  color: rgba(245, 239, 226, .66);
}
.site-footer__service {
  font-size: 13px;
  color: rgba(245, 239, 226, .48);
}

/* ---------- 12. 显现动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .62s var(--ease), transform .62s var(--ease);
  will-change: opacity, transform;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1180px) {
  .site-nav { gap: 10px; }
  .site-nav__list a { padding: 7px 11px; font-size: 13.5px; }
  .site-nav__actions .btn { padding: 9px 15px; font-size: 13.5px; }
  .brand__tagline { display: none; }
}

@media (max-width: 980px) {
  :root { --header-h: 68px; }

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

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h);
    z-index: 70;
    display: block;
    margin-left: 0;
    padding: 20px var(--gutter) 28px;
    background: var(--ink);
    border-bottom: 1px solid rgba(217, 164, 65, .3);
    box-shadow: 0 30px 46px -30px rgba(0, 0, 0, .9);
    max-height: calc(100vh - var(--header-h));
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .26s var(--ease), transform .26s var(--ease), visibility .26s linear;
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .site-nav__list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }
  .site-nav__list li { flex: 0 0 auto; }
  .site-nav__list a {
    padding: 9px 16px;
    font-size: 15px;
    border-color: rgba(245, 239, 226, .16);
  }
  .site-nav__actions {
    margin-top: 20px;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  .site-nav__actions .btn { width: 100%; padding: 12px 20px; font-size: 15px; }

  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }
  .footer-note { max-width: 100%; }

  .grid--sidebar { grid-template-columns: minmax(0, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 20px; }
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 12; }
  .card--offset { transform: none; }
  .card--offset:hover { transform: translateY(-2px); }
  .site-footer__legal-inner { flex-direction: column; align-items: flex-start; }
  .footer-contact li { flex-direction: column; align-items: flex-start; gap: 6px; }
  .footer-contact__k { min-width: 0; }
  .copy-btn { width: 100%; justify-content: space-between; }
}

@media (max-width: 460px) {
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
  .brand__name { font-size: 17px; }
  .brand__chip { width: 36px; height: 36px; }
}

/* ---------- 14. 减少动态偏好 ---------- */
@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;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .card:hover,
  .btn:hover { transform: none; }

  .site-header__progress { display: none; }
}