/* ============================================================
   奔驰电玩城 · 共享样式 /assets/site.css
   结构：令牌 → 重置 → 排版 → 栅格 → 表面 → 部件 → 头部 → 页脚 → 动效 → 响应式
   ============================================================ */

:root{
  --ink:#07090F;
  --panel:#10151F;
  --glass:rgba(200,220,255,.08);
  --glass-line:rgba(200,220,255,.16);
  --glass-hair:rgba(200,220,255,.10);
  --text:#F2F4F8;
  --muted:rgba(242,244,248,.68);
  --faint:rgba(242,244,248,.40);
  --blue:#2E7BFF;
  --red:#FF2D55;
  --gold:#E7C87A;
  --jade:#2FD3A8;
  --amber:#FFB020;
  --wine:#4A1220;
  --indigo:#1B1440;
  --teal:#0C2B2E;

  --shell:1240px;
  --radius:14px;
  --edge:22px;

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

/* ---------- 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--ink);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(58% 42% at 10% -4%,rgba(46,123,255,.20),transparent 70%),
    radial-gradient(48% 38% at 92% 4%,rgba(255,45,85,.16),transparent 72%),
    radial-gradient(70% 46% at 50% 104%,rgba(231,200,122,.10),transparent 72%);
}
h1,h2,h3,h4,h5{margin:0 0 .6em;font-weight:400;line-height:1.15;letter-spacing:-.02em}
p{margin:0 0 1.05em}
img{display:block;max-width:100%;height:auto}
a{color:var(--blue);text-decoration:none;transition:color .16s ease}
a:hover{color:var(--gold)}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:4px}
::selection{background:rgba(255,45,85,.55);color:#fff}

.skip-link{
  position:fixed;
  top:.8rem;
  left:.8rem;
  z-index:300;
  padding:.7em 1.2em;
  background:var(--gold);
  color:#1A1206;
  font-size:13px;
  font-weight:700;
  letter-spacing:.14em;
  border-radius:8px;
  transform:translateY(-220%);
  transition:transform .18s ease;
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);color:#1A1206}

/* ---------- 排版层级 ---------- */
.display-xl{font-size:clamp(56px,11vw,132px);line-height:.96;letter-spacing:-.03em;font-weight:400;margin:0 0 .35em}
.display-l{font-size:clamp(40px,7vw,88px);line-height:1.02;letter-spacing:-.03em;font-weight:400;margin:0 0 .4em}
.display-m{font-size:clamp(30px,4.4vw,56px);line-height:1.08;letter-spacing:-.02em;font-weight:400;margin:0 0 .5em}
.display-s{font-size:clamp(21px,2.8vw,32px);line-height:1.22;letter-spacing:-.01em;font-weight:500;margin:0 0 .6em}
.neon-title{
  font-weight:700;
  letter-spacing:.02em;
  color:#fff;
  -webkit-text-stroke:1px rgba(255,45,85,.72);
  text-shadow:0 0 7px rgba(255,45,85,.85),0 0 26px rgba(255,45,85,.5),0 0 46px rgba(46,123,255,.35);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.7em;
  margin:0 0 1em;
  font-size:11px;
  letter-spacing:.18em;
  line-height:1;
  color:var(--gold);
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.75}
.lede{font-size:clamp(17px,1.6vw,20px);line-height:1.85;color:var(--muted);max-width:34em}
.mono{font-family:var(--font-mono);letter-spacing:.04em;font-variant-numeric:tabular-nums}
.prose{max-width:34em}
.prose h2{font-size:clamp(22px,2.6vw,30px);margin:1.8em 0 .6em}
.prose h3{font-size:19px;font-weight:500;margin:1.6em 0 .5em}
.prose p,.prose li{color:var(--muted)}
.prose strong{color:var(--text);font-weight:700}
.prose code{
  font-family:var(--font-mono);
  font-size:15px;
  letter-spacing:.04em;
  color:var(--gold);
  background:var(--glass);
  border:1px solid var(--glass-hair);
  border-radius:6px;
  padding:.1em .45em;
}
.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1.2em}
.stat{display:flex;flex-direction:column;gap:.2em}
.stat__num{font-family:var(--font-mono);font-size:clamp(26px,3.4vw,42px);line-height:1.1;color:var(--gold);letter-spacing:.02em}
.stat__label{font-size:11px;letter-spacing:.18em;color:var(--faint)}

/* ---------- 骨架容器 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(18px,4vw,40px)}
.shell--wide{max-width:1560px}
.shell--tight{max-width:820px}
.stack{display:flex;flex-direction:column;gap:clamp(14px,2vw,24px)}
.stack--tight{gap:.7em}
.cluster{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(16px,2vw,28px)}
.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}
.tube-gap{
  height:1px;
  border:0;
  margin:clamp(28px,4vw,56px) 0;
  background:linear-gradient(90deg,transparent,rgba(200,220,255,.32),transparent);
}
.seam{
  width:1px;
  align-self:stretch;
  background:linear-gradient(180deg,transparent,var(--red),transparent);
  opacity:.7;
}

/* ---------- 表面与色区 ---------- */
.zone{position:relative;padding-block:clamp(48px,7vw,104px)}
.zone--ink{background:var(--ink)}
.zone--wine{background:linear-gradient(180deg,var(--wine),#2B0A14)}
.zone--indigo{background:linear-gradient(180deg,var(--indigo),#100C2B)}
.zone--teal{background:linear-gradient(180deg,var(--teal),#06181A)}
.panel{
  background:var(--panel);
  border:1px solid var(--glass-hair);
  border-radius:var(--radius);
  padding:clamp(20px,3vw,32px);
}
.glass{
  background:var(--glass);
  border:1px solid var(--glass-line);
  border-radius:var(--radius);
  backdrop-filter:blur(10px) saturate(140%);
  -webkit-backdrop-filter:blur(10px) saturate(140%);
}
.slice-card{
  position:relative;
  background:var(--panel);
  border:1px solid var(--glass-hair);
  padding:clamp(20px,3vw,30px);
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--edge)),calc(100% - var(--edge)) 100%,0 100%);
}
.slice-card--left{
  clip-path:polygon(var(--edge) 0,100% 0,100% 100%,0 100%,0 var(--edge));
}

/* ---------- 按钮 / 标签 / 芯片 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.6em;
  padding:.85em 1.55em;
  border:1px solid transparent;
  border-radius:10px;
  font-family:var(--font-sans);
  font-size:14px;
  font-weight:700;
  letter-spacing:.14em;
  line-height:1;
  white-space:nowrap;
  cursor:pointer;
  transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease,color .16s ease,border-color .16s ease;
}
.btn--neon{
  background:linear-gradient(140deg,var(--red),#A3123A);
  color:#fff;
  box-shadow:0 0 0 1px rgba(231,200,122,.45),0 12px 26px -16px rgba(255,45,85,.95);
}
.btn--neon:hover{color:#fff;transform:translateY(-2px);box-shadow:0 0 0 1px var(--gold),0 0 24px -4px rgba(255,45,85,.75)}
.btn--ghost{
  background:var(--glass);
  border-color:var(--glass-line);
  color:var(--text);
}
.btn--ghost:hover{color:var(--gold);border-color:rgba(231,200,122,.6);box-shadow:0 0 20px -8px rgba(231,200,122,.9)}
.btn--gold{
  background:linear-gradient(140deg,var(--gold),#B99442);
  color:#1A1206;
}
.btn--gold:hover{color:#1A1206;transform:translateY(-2px);box-shadow:0 0 22px -8px rgba(231,200,122,.95)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:.55em .85em;
  border:1px solid var(--glass-line);
  border-radius:999px;
  background:var(--glass);
  color:var(--text);
  font-size:11px;
  letter-spacing:.18em;
  line-height:1;
  white-space:nowrap;
}
.tag__dot{width:7px;height:7px;border-radius:50%;background:currentColor;box-shadow:0 0 8px currentColor}
.tag--gold{color:var(--gold);border-color:rgba(231,200,122,.5);background:rgba(231,200,122,.08)}
.tag--jade{color:var(--jade);border-color:rgba(47,211,168,.5);background:rgba(47,211,168,.08)}
.tag--amber{color:var(--amber);border-color:rgba(255,176,32,.5);background:rgba(255,176,32,.08)}
.tag--red{color:#FF7C99;border-color:rgba(255,45,85,.55);background:rgba(255,45,85,.12)}
.tag--blue{color:#8FBBFF;border-color:rgba(46,123,255,.55);background:rgba(46,123,255,.12)}

.pill{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:.5em 1em;
  border:1px solid var(--glass-line);
  border-radius:999px;
  background:var(--glass);
  color:var(--muted);
  font-size:12px;
  letter-spacing:.14em;
  line-height:1.4;
  cursor:pointer;
  transition:color .16s ease,background-color .16s ease,border-color .16s ease;
}
.pill:hover{color:var(--text)}
.pill[aria-pressed="true"],.pill.is-active{color:#1A1206;background:var(--gold);border-color:var(--gold)}

/* ---------- 面包屑 ---------- */
.crumbs{padding-block:14px}
.crumbs__list{display:flex;flex-wrap:wrap;gap:.6em;list-style:none;margin:0;padding:0}
.crumbs__item{font-size:11px;letter-spacing:.16em;color:var(--faint)}
.crumbs__item a{color:var(--muted)}
.crumbs__item a:hover{color:var(--gold)}
.crumbs__sep{opacity:.5}

/* ---------- 图片容器（页面阶段放入占位图） ---------- */
.figure{margin:0}
.figure__media{
  position:relative;
  overflow:hidden;
  border:1px solid var(--glass-line);
  border-radius:12px;
  aspect-ratio:16/9;
  background:
    linear-gradient(135deg,#10151F 0%,#1B1440 55%,#0C2B2E 100%);
}
.figure__media img{width:100%;height:100%;object-fit:cover}
.figure__media--square{aspect-ratio:1/1}
.figure__media--wide{aspect-ratio:21/9}
.figure__media--tall{aspect-ratio:3/4}
.figure__media--neon{box-shadow:0 0 0 1px rgba(255,45,85,.45),0 0 34px -16px rgba(255,45,85,.95)}
.figure__cap{margin-top:.7em;font-size:12px;letter-spacing:.1em;color:var(--faint)}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(7,9,15,.9);
  border-bottom:1px solid var(--glass-hair);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
}
.header-slab{
  background:
    linear-gradient(90deg,rgba(74,18,32,.55) 0%,rgba(7,9,15,0) 58%),
    repeating-linear-gradient(102deg,rgba(242,244,248,.045) 0 1px,transparent 1px 7px);
}
.header-slab__inner{
  display:flex;
  align-items:center;
  gap:18px;
  min-height:78px;
  padding-block:12px;
}
.wordmark{display:flex;align-items:center;gap:14px;min-width:0;color:var(--text)}
.wordmark:hover{color:var(--text)}
.wordmark__mark{
  display:grid;
  place-items:center;
  flex:none;
  width:42px;height:42px;
  border-radius:10px;
  background:linear-gradient(160deg,var(--red),#8C0F2C);
  color:#fff;
  font-size:20px;
  font-weight:700;
  line-height:1;
  box-shadow:0 0 0 1px rgba(231,200,122,.5),0 0 20px -6px rgba(255,45,85,.85);
}
.wordmark__body{display:flex;flex-direction:column;min-width:0}
.wordmark__name{font-size:20px;font-weight:700;letter-spacing:.06em;line-height:1.25}
.wordmark__line{
  font-size:11px;
  letter-spacing:.18em;
  color:var(--faint);
  line-height:1.6;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.header-meta{display:flex;align-items:center;gap:14px;margin-left:auto}
.header-meta__icp{font-size:11px;color:var(--faint)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid var(--glass-line);
  border-radius:10px;
  background:var(--glass);
  color:var(--text);
  font-size:13px;
  letter-spacing:.16em;
  line-height:1;
  cursor:pointer;
  transition:border-color .16s ease,color .16s ease;
}
.nav-toggle:hover{border-color:rgba(231,200,122,.6);color:var(--gold)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle__bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background:var(--red);
  box-shadow:0 0 8px rgba(255,45,85,.85);
  transition:transform .18s ease,width .18s ease;
}
.nav-toggle__bars span:nth-child(2){width:70%}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg);width:100%}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){transform:scaleX(0)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg);width:100%}

.nav-rail{
  border-top:1px solid var(--glass-hair);
  background:linear-gradient(180deg,rgba(200,220,255,.045),rgba(7,9,15,0));
}
.nav-rail__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding-block:4px;
}
.site-nav{min-width:0}
.site-nav__list{display:flex;flex-wrap:wrap;align-items:stretch;gap:2px;list-style:none;margin:0;padding:0}
.site-nav__item{display:flex}
.site-nav__link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:.55em;
  padding:14px 16px 13px;
  color:var(--muted);
  font-size:15px;
  letter-spacing:.06em;
  line-height:1;
  transition:color .16s ease,filter .16s ease;
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:14px;right:14px;bottom:6px;
  height:2px;
  border-radius:2px;
  background:rgba(200,220,255,.16);
  transition:background .16s ease,box-shadow .16s ease;
}
.site-nav__link:hover{color:var(--text);filter:brightness(1.35)}
.site-nav__link:hover::after{background:var(--blue);box-shadow:0 0 12px rgba(46,123,255,.9)}
.site-nav__link[aria-current="page"]{color:var(--gold);filter:none}
.site-nav__link[aria-current="page"]::after{
  background:var(--gold);
  box-shadow:0 0 12px rgba(231,200,122,.95),0 0 26px rgba(231,200,122,.45);
}
.site-nav__idx{font-size:10px;color:var(--faint)}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--gold);opacity:.85}
.header-cta{flex:none;margin-block:10px}

.tube-progress{
  height:2px;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--red),var(--gold) 54%,var(--blue));
  box-shadow:0 0 14px rgba(255,45,85,.6);
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,120px);
  background:linear-gradient(180deg,rgba(27,20,64,.55),rgba(7,9,15,1) 62%);
  border-top:1px solid var(--glass-line);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;right:0;
  height:2px;
  background:linear-gradient(90deg,transparent,var(--red) 22%,var(--gold) 50%,var(--blue) 78%,transparent);
  opacity:.85;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(240px,1.5fr) minmax(140px,1fr) minmax(130px,1fr) minmax(220px,1.4fr);
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(40px,6vw,72px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px}
.wordmark--footer{align-items:flex-start}
.footer-note{margin:0;font-size:14px;line-height:1.8;color:var(--muted);max-width:26em}
.footer-stamp{margin:0;font-size:12px;color:var(--faint)}
.footer-col{min-width:0}
.footer-col__title{
  margin:0 0 1.1em;
  font-size:11px;
  font-weight:400;
  letter-spacing:.18em;
  color:var(--gold);
  position:relative;
  padding-bottom:.7em;
}
.footer-col__title::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:34px;height:1px;
  background:currentColor;
  opacity:.7;
}
.footer-col__list{list-style:none;margin:0;padding:0}
.footer-col__list li{padding:.3em 0;font-size:14px;line-height:1.75;color:var(--muted)}
.footer-col__list a{color:var(--muted);border-bottom:1px solid transparent}
.footer-col__list a:hover{color:var(--gold);border-bottom-color:rgba(231,200,122,.6)}
.footer-col__list--plain li{font-size:13px;color:var(--faint)}
.footer-col__list--plain li:first-child{word-break:break-all}

.footer-base{border-top:1px solid var(--glass-hair);background:rgba(0,0,0,.35)}
.footer-base__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  padding-block:18px;
  font-size:12px;
}
.footer-sign{margin:0;color:var(--gold);letter-spacing:.08em}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:0;font-size:12px;color:var(--faint)}
.footer-dot{opacity:.5}

/* ---------- 滚动显现 ---------- */
html.js-ready [data-reveal],
html.js-ready [data-reveal-item]{opacity:0;transform:translateY(12px)}
html.js-ready [data-reveal].is-in,
html.js-ready [data-reveal-item].is-in{
  opacity:1;
  transform:none;
  transition:opacity .5s ease,transform .52s cubic-bezier(.22,.7,.2,1);
}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .header-meta__icp{display:none}
  .footer-top{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .wordmark__line{display:none}
  .nav-rail__inner{flex-direction:column;align-items:stretch;gap:0;padding-block:0}
  .site-nav{display:none;padding-block:6px 2px}
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;gap:0}
  .site-nav__item{border-top:1px solid rgba(200,220,255,.08)}
  .site-nav__item:first-child{border-top:0}
  .site-nav__link{padding:15px 6px 15px 16px;font-size:16px}
  .site-nav__link::after{
    left:0;right:auto;
    top:50%;bottom:auto;
    width:2px;height:20px;
    transform:translateY(-50%);
  }
  .header-cta{width:100%;margin:14px 0 18px}
  .grid-12{grid-template-columns:repeat(6,1fr)}
  .span-4,.span-5,.span-6{grid-column:span 3}
  .span-7,.span-8{grid-column:span 6}
}
@media (max-width:600px){
  body{font-size:16px}
  .header-meta{display:none}
  .wordmark__name{font-size:17px}
  .wordmark__mark{width:36px;height:36px;font-size:17px}
  .header-slab__inner{min-height:66px}
  .footer-top{grid-template-columns:1fr;padding-block:36px}
  .footer-base__inner{flex-direction:column;align-items:flex-start}
  .grid-12{grid-template-columns:repeat(2,1fr)}
  .span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 2}
  .btn{width:100%}
  .cluster .btn{width:auto}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  html.js-ready [data-reveal],
  html.js-ready [data-reveal-item]{opacity:1;transform:none}
  html.js-ready [data-reveal].is-in,
  html.js-ready [data-reveal-item].is-in{transition-duration:.01ms}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .skip-link{transition:none}
}