/* ============================================================
   冰娱网 · 共享样式  /assets/site.css
   极地夜场 + 霓虹冰晶：深空蓝底、冰蓝/极光青双色、冰蚀切角
   ============================================================ */

/* ---------- 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, blockquote, dl, dd { margin: 0; }
ul, ol { list-style: none; padding: 0; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #06121F;   /* 夜冰黑 */
  --ink-800: #0B1E33;   /* 深空蓝 */
  --ink-700: #123A5C;   /* 深冰蓝 */
  --ink-600: #0F2A44;   /* 卡片底 */
  --ice:     #4FC3F7;   /* 冰蓝 */
  --aurora:  #7CFFCB;   /* 极光青 */
  --snow:    #F4FAFF;   /* 雪白 */
  --line:    #E3F2FD;   /* 冷白描边 */
  --mist:    #6E8CA8;   /* 冰晶灰蓝 */
  --neon:    #8B5CF6;   /* 霓虹紫 */
  --ember:   #FF8A3D;   /* 暖橙 */

  --rail-w: 0px;
  --topbar-h: 62px;
  --cut: 20px;
  --radius: 18px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --maxw: 1360px;

  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB",
               "Microsoft YaHei UI", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", "Courier New", monospace;
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  padding-top: var(--topbar-h);
  padding-left: var(--rail-w);
  min-height: 100vh;
  overflow-x: hidden;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: .012em;
  color: var(--snow);
  background-color: var(--ink-800);
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(900px 620px at 88% -12%, rgba(79, 195, 247, .16), transparent 66%),
    radial-gradient(760px 520px at 6% 108%, rgba(124, 255, 203, .10), transparent 72%),
    linear-gradient(180deg, #0B1E33 0%, #08192B 46%, #06121F 100%);
}
body.nav-open { overflow: hidden; }

p { text-wrap: pretty; }
h1, h2, h3, h4 { line-height: 1.2; font-weight: 800; letter-spacing: -.02em; }
strong { font-weight: 700; color: var(--snow); }
[id] { scroll-margin-top: calc(var(--topbar-h) + 22px); }

:focus-visible {
  outline: 2px solid var(--aurora);
  outline-offset: 3px;
  border-radius: 4px;
}
::selection { background: rgba(124, 255, 203, .28); color: var(--snow); }

.vh {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0;
}
.mono { font-family: var(--font-mono); letter-spacing: .04em; }

/* 冰蚀切角 */
.cut {
  clip-path: polygon(
    var(--cut, 20px) 0, 100% 0,
    100% calc(100% - var(--cut, 20px)), calc(100% - var(--cut, 20px)) 100%,
    0 100%, 0 var(--cut, 20px)
  );
}
.cut--alt {
  clip-path: polygon(
    0 0, calc(100% - var(--cut, 20px)) 0, 100% var(--cut, 20px),
    100% 100%, var(--cut, 20px) 100%, 0 calc(100% - var(--cut, 20px))
  );
}

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px; left: 10px;
  z-index: 300;
  padding: 11px 18px;
  border-radius: 10px;
  font-size: 14px; font-weight: 700;
  color: var(--ink-900);
  background: linear-gradient(120deg, var(--aurora), var(--ice));
  transform: translateY(-180%);
  transition: transform .24s var(--ease);
}
.skip-link:focus, .skip-link:focus-visible { transform: translateY(0); }

/* ---------- 5. 头部 · 侧边轨道 ---------- */
.site-header { position: relative; z-index: 100; }

.rail {
  position: fixed;
  top: 0; bottom: 0; left: 0;
  z-index: 60;
  width: min(86vw, 320px);
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: 26px 20px 28px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: linear-gradient(172deg, #06121F 0%, #0B1E33 56%, #0A2137 100%);
  border-right: 1px solid rgba(227, 242, 253, .12);
  transform: translateX(-101%);
  transition: transform .42s var(--ease);
}
.rail::after {
  content: "";
  position: absolute;
  top: 0; right: -1px;
  width: 1px; height: 40%;
  background: linear-gradient(180deg, transparent, var(--ice) 45%, transparent);
  opacity: .85;
  pointer-events: none;
}
.site-header[data-open] .rail { transform: translateX(0); }

.rail__close {
  position: absolute;
  top: 14px; right: 12px;
  z-index: 3;
  width: 36px; height: 36px;
  border-radius: 10px;
  border: 1px solid rgba(227, 242, 253, .2);
  background: rgba(18, 58, 92, .55);
  transition: border-color .2s, background .2s;
}
.rail__close:hover { border-color: var(--aurora); background: rgba(124, 255, 203, .12); }
.rail__close span { position: absolute; top: 50%; left: 50%; width: 14px; height: 14px; transform: translate(-50%, -50%); }
.rail__close span::before, .rail__close span::after {
  content: ""; position: absolute; top: 50%; left: 0;
  width: 14px; height: 1.5px; border-radius: 2px; background: var(--snow);
}
.rail__close span::before { transform: rotate(45deg); }
.rail__close span::after { transform: rotate(-45deg); }

/* 品牌 */
.brand { display: flex; align-items: center; gap: 12px; padding: 2px; }
.brand__plate {
  --cut: 11px;
  flex: 0 0 auto;
  width: 44px; height: 44px;
  display: grid; place-items: center;
  font-size: 20px; font-weight: 800; letter-spacing: -.02em;
  color: #04141F;
  background: linear-gradient(135deg, var(--aurora) 0%, var(--ice) 100%);
  filter: drop-shadow(0 0 14px rgba(79, 195, 247, .45));
}
.brand__text { display: flex; flex-direction: column; gap: 2px; }
.brand__name { font-size: 18px; font-weight: 800; letter-spacing: .01em; color: var(--snow); }
.brand__sub { font-family: var(--font-mono); font-size: 10px; letter-spacing: .22em; color: var(--mist); }

/* 导航 */
.site-nav { display: flex; flex-direction: column; gap: 10px; flex: 1 1 auto; }
.site-nav__title {
  padding-left: 10px;
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: .26em;
  color: var(--mist);
}
.site-nav__list { display: flex; flex-direction: column; gap: 3px; }
.site-nav__link {
  position: relative;
  display: flex; align-items: center; gap: 12px;
  padding: 11px 14px;
  border-radius: 12px;
  color: rgba(244, 250, 255, .74);
  transition: color .24s var(--ease), background .24s var(--ease), transform .24s var(--ease);
}
.site-nav__link::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 3px; height: 0;
  transform: translateY(-50%);
  border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--aurora), var(--ice));
  transition: height .3s var(--ease);
}
.site-nav__index {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .08em;
  color: var(--mist);
  transition: color .24s;
}
.site-nav__label { font-size: 15px; font-weight: 600; letter-spacing: .02em; }
.site-nav__link:hover { color: var(--snow); background: rgba(79, 195, 247, .1); transform: translateX(2px); }
.site-nav__link:hover::before { height: 52%; }
.site-nav__link[aria-current="page"] {
  color: var(--snow);
  background: linear-gradient(90deg, rgba(79, 195, 247, .22), rgba(124, 255, 203, .05) 68%, transparent);
}
.site-nav__link[aria-current="page"]::before { height: 72%; }
.site-nav__link[aria-current="page"] .site-nav__index { color: var(--aurora); }

.site-nav__meta {
  display: flex; flex-direction: column; gap: 10px;
  margin-top: auto;
  padding: 16px 12px 0;
  border-top: 1px solid rgba(227, 242, 253, .1);
}
.version-tag {
  --cut: 6px;
  align-self: flex-start;
  padding: 4px 11px;
  font-family: var(--font-mono);
  font-size: 12px; font-weight: 700; letter-spacing: .12em;
  color: #351403;
  background: linear-gradient(120deg, var(--ember), #FFC08A);
}
.site-nav__meta-text { font-size: 12px; line-height: 1.7; color: var(--mist); }

/* ---------- 6. 头部 · 顶部轻量条 ---------- */
.topbar {
  position: fixed;
  top: 0; left: var(--rail-w); right: 0;
  z-index: 50;
  height: var(--topbar-h);
  background: rgba(6, 18, 31, .76);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  backdrop-filter: blur(16px) saturate(1.3);
  border-bottom: 1px solid rgba(227, 242, 253, .1);
}
.topbar__inner {
  height: 100%;
  max-width: 1720px;
  margin: 0 auto;
  padding: 0 14px;
  display: flex; align-items: center; gap: 12px;
}
.nav-toggle {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 13px; font-weight: 700;
  color: var(--snow);
  border: 1px solid rgba(227, 242, 253, .18);
  background: rgba(79, 195, 247, .09);
  transition: border-color .2s, background .2s;
}
.nav-toggle:hover { border-color: var(--aurora); background: rgba(124, 255, 203, .12); }
.nav-toggle__bars { position: relative; display: block; width: 16px; height: 10px; }
.nav-toggle__bars::before, .nav-toggle__bars::after {
  content: ""; position: absolute; left: 0; right: 0;
  height: 1.5px; border-radius: 2px; background: var(--aurora);
  transition: transform .28s var(--ease);
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(4.25px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-4.25px) rotate(-45deg); }

.topbar__brand {
  display: inline-flex; align-items: baseline; gap: 6px;
  font-size: 17px; font-weight: 800; letter-spacing: -.01em;
  color: var(--snow);
}
.topbar__brand-ver {
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 10px; font-weight: 400; letter-spacing: .1em;
  color: var(--ember);
  border: 1px solid rgba(255, 138, 61, .5);
  border-radius: 4px;
}

.quick-links { margin-left: auto; display: flex; align-items: center; gap: 8px; min-width: 0; }
.quick {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 13px;
  border-radius: 999px;
  font-size: 13px; font-weight: 600;
  color: rgba(244, 250, 255, .8);
  border: 1px solid rgba(227, 242, 253, .15);
  background: rgba(18, 58, 92, .48);
  transition: color .22s, border-color .22s, background .22s, transform .22s;
}
.quick:hover { color: var(--snow); border-color: rgba(124, 255, 203, .55); background: rgba(79, 195, 247, .16); transform: translateY(-1px); }
.quick__glyph { position: relative; width: 12px; height: 12px; border: 1.5px solid currentColor; border-radius: 50%; }
.quick__glyph::after {
  content: ""; position: absolute; right: -4px; bottom: -3px;
  width: 6px; height: 1.5px; border-radius: 2px;
  background: currentColor; transform: rotate(45deg);
}
.quick__dot { width: 6px; height: 6px; border-radius: 50%; background: var(--aurora); box-shadow: 0 0 8px var(--aurora); }
.quick--verify .quick__dot { background: var(--ice); box-shadow: 0 0 8px var(--ice); }
.quick--contact .quick__dot { background: var(--ember); box-shadow: 0 0 8px var(--ember); }

/* 滚动进度 */
.scroll-progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: rgba(227, 242, 253, .08); }
.scroll-progress__bar {
  display: block; width: 0; height: 100%;
  background: linear-gradient(90deg, var(--ice), var(--aurora));
  box-shadow: 0 0 12px rgba(124, 255, 203, .55);
  transition: width .12s linear;
}

/* 遮罩 */
.nav-scrim {
  position: fixed; inset: 0; z-index: 55;
  border: 0; padding: 0;
  background: rgba(6, 18, 31, .72);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .32s var(--ease);
}
.site-header[data-open] .nav-scrim { opacity: 1; pointer-events: auto; }

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 0;
  padding: 68px 0 28px;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(6, 18, 31, 0) 0%, #08192B 34%, #06121F 100%);
  border-top: 1px solid rgba(227, 242, 253, .1);
}
.site-footer::before {
  content: "";
  position: absolute; top: -1px; left: 0;
  width: min(460px, 62%); height: 2px;
  background: linear-gradient(90deg, var(--ice), var(--aurora), transparent);
}
.footer__glow {
  position: absolute;
  top: -180px; right: -120px;
  width: 520px; height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(139, 92, 246, .18), transparent 68%);
  pointer-events: none;
}
.footer__inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  display: flex; flex-direction: column; gap: 40px;
}
.footer__head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; flex-wrap: wrap;
}
.footer__brand { display: flex; align-items: center; gap: 12px; }
.footer__brand-text { display: flex; flex-direction: column; gap: 2px; }
.footer__brand-text strong { font-size: 20px; font-weight: 800; letter-spacing: -.01em; }
.footer__brand-text span { font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em; color: var(--mist); }
.footer__back {
  --cut: 9px;
  padding: 11px 20px;
  font-size: 13px; font-weight: 700;
  color: #04141F;
  background: linear-gradient(120deg, var(--aurora), var(--ice));
  transition: filter .22s, transform .22s;
}
.footer__back:hover { filter: brightness(1.08); transform: translateY(-1px); }

.footer__grid { display: grid; gap: 30px; grid-template-columns: 1fr; }
.footer__col { min-width: 0; }
.footer__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px; font-weight: 700; letter-spacing: .2em;
  color: var(--aurora);
}
.footer__links { display: flex; flex-direction: column; gap: 11px; }
.footer__links a {
  position: relative;
  padding-left: 15px;
  font-size: 14px;
  color: rgba(244, 250, 255, .72);
  transition: color .2s, padding-left .2s;
}
.footer__links a::before {
  content: ""; position: absolute; left: 0; top: .82em;
  width: 6px; height: 1px; background: var(--ice);
  transition: width .2s, background .2s;
}
.footer__links a:hover { color: var(--snow); padding-left: 19px; }
.footer__links a:hover::before { width: 11px; background: var(--aurora); }

.footer__meta {
  display: grid; gap: 22px;
  padding-top: 30px;
  border-top: 1px solid rgba(227, 242, 253, .1);
}
.footer__facts { display: grid; gap: 11px; align-content: start; }
.footer__facts li { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; font-size: 13.5px; }
.footer__fact-key {
  flex: 0 0 70px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .16em;
  color: var(--mist);
}
.footer__fact-val { color: rgba(244, 250, 255, .86); }
.copy-btn {
  padding: 3px 9px;
  border-radius: 7px;
  border: 1px dashed rgba(79, 195, 247, .45);
  font-size: 13px;
  color: var(--ice);
  transition: color .2s, border-color .2s, background .2s;
}
.copy-btn:hover { color: var(--aurora); border-color: var(--aurora); background: rgba(124, 255, 203, .08); }
.copy-btn[data-copied] {
  color: var(--aurora);
  border-style: solid;
  border-color: var(--aurora);
  background: rgba(124, 255, 203, .14);
}
.copy-btn[data-copied]::after {
  content: "已复制";
  margin-left: 8px;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0;
}
.footer__note { max-width: 46ch; font-size: 13px; line-height: 1.95; color: var(--mist); }

.footer__bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px 26px; flex-wrap: wrap;
  padding-top: 20px;
  border-top: 1px solid rgba(227, 242, 253, .08);
}
.footer__copy { font-size: 12px; letter-spacing: .08em; color: var(--mist); }
.footer__legal { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.footer__legal a { font-size: 12.5px; color: rgba(244, 250, 255, .62); transition: color .2s; }
.footer__legal a:hover { color: var(--aurora); }

/* ---------- 8. 通用布局组件 ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.section { padding: 64px 0; }
.section--tight { padding: 40px 0; }
.section--wide { padding: 88px 0; }
.rule { height: 1px; border: 0; margin: 0; background: linear-gradient(90deg, rgba(79, 195, 247, .5), rgba(227, 242, 253, .06) 62%, transparent); }

.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--wide { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid--tight { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }

.prose { max-width: 38em; line-height: 1.9; color: rgba(244, 250, 255, .82); }
.prose > * + * { margin-top: 1em; }
.prose h2, .prose h3 { margin-top: 1.9em; color: var(--snow); }
.prose a { color: var(--ice); border-bottom: 1px solid rgba(79, 195, 247, .4); }
.prose a:hover { color: var(--aurora); border-color: var(--aurora); }
.prose ul { padding-left: 1.1em; }
.prose li { position: relative; padding-left: .2em; }
.prose li::before { content: ""; position: absolute; left: -1em; top: .85em; width: 6px; height: 1px; background: var(--aurora); }

/* ---------- 9. 文字组件 ---------- */
.display {
  font-size: clamp(40px, 7vw, 96px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.04;
  text-shadow: 0 0 1px rgba(227, 242, 253, .85);
}
.display--ice {
  background: linear-gradient(118deg, #F4FAFF 0%, var(--ice) 56%, var(--aurora) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: none;
}
.section__title { font-size: clamp(28px, 4vw, 56px); font-weight: 800; letter-spacing: -.02em; line-height: 1.12; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .26em;
  color: var(--aurora);
  text-transform: uppercase;
}

/* ---------- 10. 面层组件 ---------- */
.glass {
  border: 1px solid rgba(227, 242, 253, .15);
  border-radius: var(--radius);
  background: rgba(18, 58, 92, .34);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
}
.card {
  padding: 22px;
  border: 1px solid rgba(227, 242, 253, .12);
  border-radius: var(--radius);
  background: linear-gradient(160deg, #12324F 0%, #0F2A44 60%, #0C2238 100%);
  transition: border-color .24s, transform .24s var(--ease);
}
.card:hover { border-color: rgba(79, 195, 247, .42); transform: translateY(-3px); }

/* ---------- 11. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px; font-weight: 700; letter-spacing: .02em;
  transition: transform .22s var(--ease), background .22s, color .22s, border-color .22s, box-shadow .22s;
}
.btn--primary {
  color: #04141F;
  background: linear-gradient(120deg, var(--ice), var(--aurora));
  box-shadow: 0 12px 30px -16px rgba(79, 195, 247, .95);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 18px 36px -16px rgba(124, 255, 203, .95); }
.btn--ghost {
  color: var(--snow);
  border-color: rgba(227, 242, 253, .26);
  background: rgba(79, 195, 247, .06);
}
.btn--ghost:hover { color: var(--aurora); border-color: var(--aurora); background: rgba(124, 255, 203, .1); }
.btn--ember { color: #351403; background: linear-gradient(120deg, var(--ember), #FFC08A); }
.btn--ember:hover { transform: translateY(-2px); }
.btn--neon { color: #F6F2FF; background: linear-gradient(120deg, var(--neon), #B79BFF); }
.btn--neon:hover { transform: translateY(-2px); }
.btn--sm { padding: 9px 16px; font-size: 13px; }

/* ---------- 12. 标签 ---------- */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid rgba(227, 242, 253, .2);
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .1em;
  color: var(--mist);
}
.tag--ice { color: var(--ice); border-color: rgba(79, 195, 247, .46); background: rgba(79, 195, 247, .12); }
.tag--aurora { color: var(--aurora); border-color: rgba(124, 255, 203, .46); background: rgba(124, 255, 203, .1); }
.tag--neon { color: #CBB6FF; border-color: rgba(139, 92, 246, .5); background: rgba(139, 92, 246, .16); }
.tag--ember { color: #FFC49B; border-color: rgba(255, 138, 61, .5); background: rgba(255, 138, 61, .13); }

/* ---------- 13. 面包屑 ---------- */
.crumb { margin: 24px 0 0; }
.crumb__list {
  display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: .12em;
  color: var(--mist);
}
.crumb__list li { display: inline-flex; align-items: center; gap: 10px; }
.crumb__list li + li::before { content: "/"; color: rgba(110, 140, 168, .6); }
.crumb__list a { color: rgba(244, 250, 255, .72); transition: color .2s; }
.crumb__list a:hover { color: var(--aurora); }
.crumb__list [aria-current="page"] { color: var(--aurora); }

/* ---------- 14. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid rgba(227, 242, 253, .12);
  background: linear-gradient(140deg, #12324F, #06121F);
}
.media img { width: 100%; height: 100%; object-fit: cover; }
.media::after {
  content: "";
  position: absolute; inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 30, 51, 0) 42%, rgba(6, 18, 31, .74) 100%);
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media__caption {
  position: absolute;
  left: 16px; right: 16px; bottom: 14px;
  z-index: 1;
  font-size: 12px;
  color: rgba(244, 250, 255, .84);
}

/* ---------- 15. 滚动显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .62s var(--ease), transform .62s var(--ease);
}
.js [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 16. 响应式 · 平板 768–1199 ---------- */
@media (min-width: 768px) {
  :root { --rail-w: 78px; }

  .rail {
    width: var(--rail-w);
    align-items: center;
    gap: 20px;
    padding: 22px 10px 26px;
    transform: none;
    transition: none;
  }
  .site-header[data-open] .rail { transform: none; }
  .rail__close { display: none; }
  .brand { justify-content: center; }
  .brand__text { display: none; }

  .site-nav { width: 100%; align-items: center; }
  .site-nav__title { display: none; }
  .site-nav__list { width: 100%; gap: 6px; }
  .site-nav__link { justify-content: center; padding: 13px 0; border-radius: 12px; }
  .site-nav__link:hover { transform: none; }
  .site-nav__link::before { left: auto; right: -10px; border-radius: 3px 0 0 3px; }
  .site-nav__index { font-size: 13px; letter-spacing: .04em; color: rgba(244, 250, 255, .6); }
  .site-nav__label {
    position: absolute !important;
    width: 1px; height: 1px;
    overflow: hidden; clip-path: inset(50%); white-space: nowrap;
  }
  .site-nav__meta { align-items: center; padding: 14px 0 0; width: 100%; }
  .site-nav__meta-text { display: none; }
  .version-tag { align-self: center; }

  .nav-toggle, .topbar__brand { display: none; }
  .nav-scrim { display: none; }
  .footer__inner { padding: 0 32px; }
  .wrap { padding: 0 32px; }
}

/* ---------- 17. 响应式 · 桌面 ≥1200 ---------- */
@media (min-width: 1200px) {
  :root { --rail-w: 240px; --topbar-h: 66px; }

  .rail {
    align-items: stretch;
    gap: 26px;
    padding: 26px 20px 30px;
  }
  .brand { justify-content: flex-start; }
  .brand__text { display: flex; }

  .site-nav { align-items: stretch; }
  .site-nav__title { display: block; }
  .site-nav__link { justify-content: flex-start; padding: 11px 14px; }
  .site-nav__link::before { left: 0; right: auto; border-radius: 0 3px 3px 0; }
  .site-nav__index { font-size: 11px; color: var(--mist); }
  .site-nav__label {
    position: static !important;
    width: auto; height: auto;
    overflow: visible; clip-path: none; white-space: normal;
  }
  .site-nav__meta { align-items: flex-start; padding: 16px 12px 0; }
  .site-nav__meta-text { display: block; }
  .version-tag { align-self: flex-start; }

  .footer__inner { padding: 0 48px; }
  .footer__grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 34px; }
  .footer__meta { grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 36px; }
  .wrap { padding: 0 48px; }
}

/* ---------- 18. 小屏微调 ---------- */
@media (max-width: 640px) {
  .quick--verify .quick__label,
  .quick--contact .quick__label {
    position: absolute !important;
    width: 1px; height: 1px;
    overflow: hidden; clip-path: inset(50%); white-space: nowrap;
  }
  .quick--verify, .quick--contact { padding: 8px 10px; }
  .footer__head { flex-direction: column; align-items: flex-start; }
  .footer__back { width: 100%; text-align: center; justify-content: center; }
  .footer__bar { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 520px) {
  .quick--search .quick__label {
    position: absolute !important;
    width: 1px; height: 1px;
    overflow: hidden; clip-path: inset(50%); white-space: nowrap;
  }
  .quick--search { padding: 8px 11px; }
  .topbar__brand { font-size: 16px; }
}

/* ---------- 19. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }
  .rail { transform: none; }
  .js [data-reveal] { opacity: 1; transform: none; }
  .quick:hover, .btn:hover, .card:hover, .footer__back:hover { transform: none; }
}