/* =============================================================
   德州电玩 · 共享样式 /assets/site.css
   视觉体系：夜间控制台 × 版本档案柜
   ============================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

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, canvas { 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; border-spacing: 0; }
hr { border: 0; margin: 0; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色彩 */
  --c-night: #08130F;
  --c-night-deep: #050C0A;
  --c-carbon: #111417;
  --c-teal: #0E2721;
  --c-line: #1F3B34;
  --c-neon: #3DF2C0;
  --c-amber: #F0B429;
  --c-signal: #FF5D5D;
  --c-mist: #A9B7B1;
  --c-mist-dim: #6E7C77;
  --c-paper: #E9F5F0;
  --c-glow: #8CF6DC;

  /* 字阶 */
  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-base: 16px;
  --fs-md: 20px;
  --fs-lg: 26px;
  --fs-xl: 34px;
  --fs-2xl: 46px;
  --fs-3xl: 60px;

  --lh-tight: 1.24;
  --lh-snug: 1.5;
  --lh-body: 1.75;

  --ff-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --ff-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;
  --ff-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", Georgia, "Times New Roman", serif;

  --ls-wide: .04em;
  --ls-wider: .14em;

  /* 布局 */
  --shell: 1240px;
  --shell-narrow: 760px;
  --gutter: 24px;
  --header-h: 68px;

  --r-sm: 2px;
  --r-md: 5px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

@media (max-width: 767px) {
  :root {
    --fs-sm: 13px;
    --fs-base: 15px;
    --fs-md: 18px;
    --fs-lg: 23px;
    --fs-xl: 30px;
    --fs-2xl: 38px;
    --fs-3xl: 46px;
    --gutter: 18px;
    --header-h: 62px;
    --shell-narrow: 100%;
  }
}

/* ---------- 3. 基础与排版 ---------- */
body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--c-night);
  background-image:
    radial-gradient(1100px 560px at 14% -6%, rgba(61, 242, 192, .10), transparent 62%),
    radial-gradient(880px 480px at 96% 2%, rgba(240, 180, 41, .065), transparent 58%),
    radial-gradient(760px 900px at 84% 102%, rgba(31, 59, 52, .55), transparent 70%);
  background-attachment: fixed;
  color: var(--c-mist);
  font-family: var(--ff-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 全站细扫描线，控制台质感 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  background-image: repeating-linear-gradient(to bottom,
    rgba(233, 245, 240, .028) 0 1px,
    transparent 1px 3px);
  opacity: .85;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--c-paper);
  font-weight: 700;
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-wide);
  text-wrap: balance;
}

h1 { font-size: var(--fs-3xl); font-weight: 800; }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-lg); }
h5 { font-size: var(--fs-md); }
h6 { font-size: var(--fs-base); }

p { max-width: 44em; }

strong { color: var(--c-paper); font-weight: 600; }

.mono {
  font-family: var(--ff-mono);
  font-size: .92em;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
}

/* ---------- 4. 焦点与跳转 ---------- */
:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 11px 18px;
  background: var(--c-neon);
  color: #06120E;
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: var(--ls-wide);
  border-radius: var(--r-sm);
  box-shadow: 0 12px 32px -14px rgba(61, 242, 192, .9);
  transform: translateY(-180%);
  transition: transform .22s var(--ease);
}

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

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-family: var(--ff-sans);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: var(--ls-wide);
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease), box-shadow .25s var(--ease);
}

.btn-primary {
  background: var(--c-neon);
  color: #06120E;
  box-shadow: 0 0 0 1px rgba(61, 242, 192, .30), 0 14px 32px -20px rgba(61, 242, 192, .95);
}

.btn-primary:hover {
  background: var(--c-glow);
  box-shadow: 0 0 0 1px rgba(140, 246, 220, .65), 0 18px 38px -18px rgba(61, 242, 192, .9);
}

.btn-ghost {
  background: transparent;
  color: var(--c-paper);
  border-color: var(--c-line);
}

.btn-ghost:hover {
  color: var(--c-neon);
  border-color: var(--c-neon);
  box-shadow: 0 0 18px -6px rgba(61, 242, 192, .6);
}

.btn-amber {
  background: var(--c-amber);
  color: #1A1206;
}

.btn-amber:hover { background: #FFC94A; }

.btn-sm {
  padding: 8px 14px;
  font-size: var(--fs-xs);
}

.btn:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 3px;
}

/* ---------- 6. 标签 ---------- */
.batch-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  border: 1px dashed var(--c-line);
  border-radius: var(--r-sm);
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .06em;
  color: var(--c-amber);
  white-space: nowrap;
  opacity: .5;
  transition: opacity .35s var(--ease), border-color .35s var(--ease);
}

.site-header.is-scrolled .batch-chip {
  opacity: 1;
  border-color: rgba(240, 180, 41, .45);
}

.batch-chip::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
}

.label-print {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: var(--c-mist);
  background: rgba(17, 20, 23, .5);
}

.tag-mono {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
}

/* ---------- 7. 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  padding: 0 var(--gutter);
  border-bottom: 1px solid transparent;
  background-image: linear-gradient(180deg,
    rgba(8, 19, 15, .94) 0%,
    rgba(8, 19, 15, .66) 58%,
    rgba(8, 19, 15, 0) 100%);
  transition: background-color .4s var(--ease), border-color .4s var(--ease),
              box-shadow .4s var(--ease), backdrop-filter .4s var(--ease);
}

.site-header.is-scrolled {
  background-image: none;
  background-color: rgba(8, 19, 15, .88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--c-line);
  box-shadow: 0 22px 46px -36px #000;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: var(--shell);
  min-height: var(--header-h);
  margin: 0 auto;
}

/* 品牌 */
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  padding: 4px 0;
}

.brand-mark {
  position: relative;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  border: 1px solid var(--c-neon);
  border-radius: var(--r-sm);
  background: linear-gradient(150deg, rgba(61, 242, 192, .22), transparent 66%);
  box-shadow: 0 0 20px -8px rgba(61, 242, 192, .85),
              inset 0 0 14px -8px rgba(61, 242, 192, .9);
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  background: var(--c-neon);
}

.brand-mark::before {
  left: 6px;
  right: 6px;
  top: 9px;
  height: 2px;
}

.brand-mark::after {
  left: 6px;
  bottom: 9px;
  width: 10px;
  height: 2px;
  box-shadow: 0 0 7px rgba(61, 242, 192, .85);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  color: var(--c-paper);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: var(--ls-wider);
}

.brand-sub {
  color: var(--c-amber);
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: .18em;
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 12px;
  border-radius: var(--r-sm);
  color: var(--c-mist);
  font-size: var(--fs-sm);
  letter-spacing: var(--ls-wide);
  transition: color .2s var(--ease), background-color .2s var(--ease);
}

.nav-link::before {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 1px;
  background: var(--c-neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .3s var(--ease);
}

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

.nav-link:hover::before,
.nav-link:focus-visible::before { transform: scaleX(1); }

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

.nav-link[aria-current="page"]::before {
  transform: scaleX(1);
  box-shadow: 0 0 10px rgba(61, 242, 192, .8);
}

.nav-side {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 版本分段 */
.version-switch {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: rgba(17, 20, 23, .62);
}

.version-btn {
  padding: 6px 12px;
  border-radius: var(--r-sm);
  color: var(--c-mist-dim);
  font-size: var(--fs-xs);
  letter-spacing: var(--ls-wide);
  white-space: nowrap;
  transition: background-color .22s var(--ease), color .22s var(--ease);
}

.version-btn:hover { color: var(--c-paper); }

.version-btn[aria-pressed="true"] {
  background: var(--c-teal);
  color: var(--c-neon);
  box-shadow: inset 0 0 0 1px rgba(61, 242, 192, .28);
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  color: var(--c-paper);
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--ls-wider);
  transition: border-color .22s var(--ease), color .22s var(--ease);
}

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

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform .26s var(--ease), opacity .2s var(--ease),
              background-color .2s var(--ease);
}

.nav-toggle-bars { position: relative; }

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }

.site-header[data-open] .nav-toggle-bars { background: transparent; }
.site-header[data-open] .nav-toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-neon), var(--c-amber));
  box-shadow: 0 0 12px rgba(61, 242, 192, .7);
  opacity: 0;
  transition: opacity .35s var(--ease);
}

.site-header.is-scrolled .scroll-progress { opacity: 1; }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 20;
  margin-top: 104px;
  border-top: 1px solid var(--c-line);
  background: linear-gradient(180deg, var(--c-night) 0%, #060F0C 58%, var(--c-night-deep) 100%);
  color: var(--c-mist);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--c-neon) 20%,
    var(--c-amber) 56%,
    transparent 90%);
  opacity: .6;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(260px, 1.35fr) repeat(3, minmax(112px, .75fr));
  gap: 48px 40px;
  align-items: start;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 72px var(--gutter) 48px;
}

.brand-lockup--footer .brand-name { font-size: 17px; }

.footer-tag {
  margin-top: 16px;
  color: var(--c-glow);
  font-size: var(--fs-sm);
  letter-spacing: var(--ls-wide);
  max-width: 20em;
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--c-line);
  font-size: var(--fs-sm);
  color: var(--c-mist);
}

.footer-contact-list .mono { color: var(--c-paper); }

.footer-note {
  margin-top: 18px;
  max-width: 32em;
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: var(--c-mist-dim);
}

.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: var(--ls-wider);
  color: var(--c-mist-dim);
  text-transform: uppercase;
}

.col-index { color: var(--c-amber); }

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 11px;
}

.footer-col a {
  display: inline-block;
  color: var(--c-mist);
  font-size: var(--fs-sm);
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: var(--c-neon);
  border-bottom-color: rgba(61, 242, 192, .5);
}

.footer-legal {
  border-top: 1px solid var(--c-line);
  background: rgba(5, 12, 10, .72);
}

.footer-legal-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 22px var(--gutter) 26px;
  font-size: var(--fs-xs);
  color: var(--c-mist-dim);
}

.footer-copy { max-width: none; }

.legal-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.legal-links a {
  transition: color .2s var(--ease);
}

.legal-links a:hover,
.legal-links a:focus-visible { color: var(--c-neon); }

.footer-icp {
  max-width: none;
  font-family: var(--ff-mono);
  letter-spacing: .06em;
  color: var(--c-mist-dim);
}

/* ---------- 9. 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.shell--narrow { max-width: var(--shell-narrow); }

.prose { max-width: 40em; }
.prose p + p { margin-top: 1.05em; }
.prose ul,
.prose ol {
  margin-top: 1em;
  padding-left: 1.2em;
  list-style: none;
}
.prose li {
  position: relative;
  padding-left: 1.1em;
  margin-bottom: .55em;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--c-amber);
}
.prose a {
  color: var(--c-neon);
  border-bottom: 1px solid rgba(61, 242, 192, .38);
  transition: border-color .2s var(--ease);
}
.prose a:hover { border-bottom-color: var(--c-neon); }
.prose blockquote {
  margin: 1.6em 0;
  padding-left: 20px;
  border-left: 2px solid var(--c-neon);
  font-family: var(--ff-serif);
  font-size: var(--fs-md);
  line-height: 1.7;
  color: var(--c-glow);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .06em;
  color: var(--c-mist-dim);
}

.breadcrumb li { display: flex; align-items: center; gap: 9px; }

.breadcrumb li + li::before {
  content: "/";
  color: var(--c-line);
}

.breadcrumb a { color: var(--c-mist); transition: color .2s var(--ease); }
.breadcrumb a:hover { color: var(--c-neon); }
.breadcrumb [aria-current="page"] { color: var(--c-amber); }

.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 10. 通用组件 ---------- */
.panel {
  position: relative;
  padding: 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: var(--c-carbon);
}

.panel--teal {
  background: linear-gradient(158deg, var(--c-teal) 0%, var(--c-carbon) 72%);
}

.section-band {
  position: relative;
  padding: 14px 0;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  background: linear-gradient(90deg,
    var(--c-teal) 0%,
    rgba(14, 39, 33, .28) 58%,
    transparent 100%);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.section-num {
  font-family: var(--ff-mono);
  font-size: var(--fs-sm);
  letter-spacing: .14em;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
}

/* 图片容器：页面阶段直接放入 img / picture 即可 */
.frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background-color: var(--c-carbon);
  background-image:
    linear-gradient(135deg, rgba(61, 242, 192, .11), transparent 44%),
    repeating-linear-gradient(45deg,
      rgba(233, 245, 240, .032) 0 1px,
      transparent 1px 7px);
}

.frame--wide { aspect-ratio: 21 / 9; }
.frame--screen { aspect-ratio: 16 / 9; }
.frame--square { aspect-ratio: 1 / 1; }
.frame--tall { aspect-ratio: 4 / 5; }

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

.frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(to bottom,
    rgba(8, 19, 15, .38) 0 1px,
    transparent 1px 3px);
  opacity: .5;
}

.frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  max-width: 100%;
  padding: 6px 11px;
  border-top: 1px solid var(--c-line);
  border-right: 1px solid var(--c-line);
  background: rgba(8, 19, 15, .88);
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .07em;
  color: var(--c-glow);
}

.media-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

/* ---------- 11. 显现动效 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .72s var(--ease), transform .72s var(--ease);
}

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

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1119px) {
  .nav-side .batch-chip { display: none; }
  .site-nav { gap: 16px; }
}

@media (max-width: 1023px) {
  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 55;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    margin-left: 0;
    padding: 30px var(--gutter) 56px;
    overflow-y: auto;
    background: rgba(6, 15, 12, .985);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity .26s var(--ease), transform .26s var(--ease),
                visibility .26s var(--ease);
  }

  .site-header[data-open] .site-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .nav-list li { width: 100%; }

  .nav-link {
    display: block;
    padding: 17px 6px;
    border-bottom: 1px solid var(--c-line);
    font-size: var(--fs-md);
    letter-spacing: var(--ls-wide);
    color: var(--c-paper);
  }

  .nav-link::before {
    display: none;
  }

  .nav-link[aria-current="page"] {
    padding-left: 16px;
    border-left: 2px solid var(--c-neon);
    background: linear-gradient(90deg, rgba(61, 242, 192, .10), transparent 70%);
  }

  .nav-side {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
    margin-top: 30px;
    padding-top: 26px;
    border-top: 1px solid var(--c-line);
  }

  .nav-side .batch-chip { display: inline-flex; opacity: 1; }
  .nav-side .btn { width: 100%; padding: 14px 20px; font-size: var(--fs-base); }
  .version-switch { width: 100%; }
  .version-btn { flex: 1 1 0; padding: 10px 8px; text-align: center; }
}

@media (max-width: 900px) {
  .grid-3,
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px 28px;
    padding: 56px var(--gutter) 38px;
  }

  .footer-brand {
    grid-column: 1 / -1;
    padding-bottom: 8px;
  }
}

@media (max-width: 600px) {
  .grid-2,
  .grid-3,
  .grid-4,
  .media-pair { grid-template-columns: minmax(0, 1fr); }

  .site-footer { margin-top: 76px; }

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

  .footer-legal-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .legal-links { gap: 14px; }
}

@media (max-width: 480px) {
  .brand-sub { display: none; }
  .brand-name { font-size: 15px; }
  .nav-toggle-text { display: none; }
}

/* ---------- 13. 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;
  }

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

  body::before { display: none; }
}