/* ============================================
   beijingsaiche.cn — "Speed Dashboard" 骨架
   差异化：仪表盘卡片 / 赛道分隔线 / 速度表盘色
   ============================================ */

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Noto Sans SC',sans-serif;
  background:#0b0e14;
  color:#e4e7ed;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block;border-radius:10px}
a{color:#6cf;text-decoration:none;transition:color .2s}
a:hover{color:#9ef}
::selection{background:#3b82f6;color:#fff}

/* --- Speed Dashboard Color Tokens --- */
:root{
  --bg-deep:#0b0e14;
  --bg-card:#131a24;
  --bg-card-hover:#1a2432;
  --accent:#f59e0b;
  --accent-dim:#b8860b;
  --accent-glow:#fbbf24;
  --speed-red:#ef4444;
  --speed-green:#22c55e;
  --speed-blue:#3b82f6;
  --text-muted:#8899aa;
  --border-dim:#1e2a38;
  --gauge-track:#1e2a38;
}

/* --- Gauge / Speed accent bar --- */
.gauge-bar{
  height:3px;background:linear-gradient(90deg,var(--speed-green),var(--accent),var(--speed-red));
  border-radius:3px;margin:12px 0 16px;width:100%;
}

/* --- Skip link --- */
.skip{
  position:absolute;top:-100px;left:0;z-index:999;
  background:var(--accent);color:#000;padding:8px 16px;border-radius:0 0 8px 0;
  font-weight:600;
}
.skip:focus{top:0}

/* --- Layout --- */
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
.grid{display:grid;gap:28px;padding:20px 0 40px}

/* --- Header / Topbar --- */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 20px;background:rgba(11,14,20,.92);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border-dim);position:sticky;top:0;z-index:100;
}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:17px}
.brand:hover{color:var(--accent)}
.brand .logo{
  display:inline-flex;align-items:center;justify-content:center;
  width:32px;height:32px;background:var(--accent);border-radius:50%;
  font-size:16px;color:#000;font-weight:800;
}
.nav{display:flex;gap:8px;flex-wrap:wrap}
.nav .chip{
  padding:6px 14px;border-radius:20px;font-size:13px;font-weight:500;
  background:var(--bg-card);color:var(--text-muted);border:1px solid var(--border-dim);
  transition:all .2s;
}
.nav .chip:hover,.nav .chip.active{background:var(--accent);color:#000;border-color:var(--accent)}

/* --- Card --- */
.card{
  background:var(--bg-card);border-radius:14px;border:1px solid var(--border-dim);
  overflow:hidden;transition:background .25s,box-shadow .25s;
}
.card:hover{background:var(--bg-card-hover);box-shadow:0 4px 30px rgba(0,0,0,.3)}
.card.pad{padding:28px 24px}
.cardTitle{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-bottom:16px;
}
.cardTitle h2{font-size:20px;font-weight:700;color:#fff}
.badge{
  font-size:11px;font-weight:600;padding:3px 10px;border-radius:12px;
  background:var(--accent);color:#000;white-space:nowrap;
}

/* --- Hero (仪表盘风格) --- */
.hero{
  padding:40px 0 10px;
}
.heroCard{
  background:linear-gradient(135deg,var(--bg-card) 0%,#0f1a26 100%);
  border-radius:16px;border:1px solid var(--border-dim);padding:32px 28px;overflow:hidden;
  position:relative;
}
.heroCard::before{
  content:'';position:absolute;top:-50%;right:-20%;
  width:400px;height:400px;
  background:radial-gradient(circle,rgba(245,158,11,.06) 0%,transparent 70%);
  pointer-events:none;
}
.heroInner{display:flex;gap:30px;align-items:center;flex-wrap:wrap;position:relative;z-index:1}
.heroInner > div:first-child{flex:1;min-width:280px}
.heroMedia{flex:0 0 320px}
.heroMedia img{width:100%;border-radius:12px;box-shadow:0 8px 40px rgba(0,0,0,.4)}
.kicker{
  font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:1.5px;
  color:var(--accent);margin-bottom:8px;
}
.hero h1{font-size:clamp(24px,4vw,36px);font-weight:800;line-height:1.2;color:#fff;margin-bottom:14px}
.hero .lead{color:var(--text-muted);font-size:15px;max-width:560px;margin-bottom:18px}
.ctaRow{display:flex;gap:12px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:6px;padding:10px 22px;
  border-radius:8px;font-size:14px;font-weight:600;transition:all .2s;
  background:var(--bg-card);color:#fff;border:1px solid var(--border-dim);
}
.btn:hover{background:#1e2a38;color:#fff;transform:translateY(-1px);box-shadow:0 4px 12px rgba(0,0,0,.3)}
.btn.primary{background:var(--accent);color:#000;border-color:var(--accent)}
.btn.primary:hover{background:var(--accent-glow);box-shadow:0 0 20px rgba(245,158,11,.3);transform:translateY(-1px)}
.btn.outline{background:transparent;border-color:var(--accent);color:var(--accent)}
.btn.outline:hover{background:var(--accent);color:#000}

/* --- 速度仪表盘网格 (差异化视觉) --- */
.gaugeGrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px;margin-top:16px}
.gaugeItem{
  text-align:center;padding:16px 10px;background:rgba(30,42,56,.5);border-radius:10px;
  border:1px solid var(--border-dim);transition:all .2s;
}
.gaugeItem:hover{border-color:var(--accent);background:rgba(245,158,11,.06)}
.gaugeItem .num{font-size:28px;font-weight:800;color:var(--accent);line-height:1}
.gaugeItem .label{font-size:12px;color:var(--text-muted);margin-top:6px}

/* --- Link Grid (关键词互链) --- */
.linkGrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;margin-top:12px}
.linkItem{
  display:block;padding:14px 16px;border-radius:10px;
  background:rgba(30,42,56,.4);border:1px solid var(--border-dim);
  transition:all .2s;
}
.linkItem:hover{border-color:var(--accent);background:rgba(245,158,11,.06);transform:translateY(-2px)}
.linkItem .k{font-size:11px;color:var(--accent);font-weight:600;text-transform:uppercase;letter-spacing:.5px}
.linkItem .t{font-size:14px;color:#fff;margin-top:4px;font-weight:600}

/* --- Content Modules --- */
.mod{margin-bottom:24px}
.mod:last-child{margin-bottom:0}
.mod h3{font-size:17px;font-weight:700;color:var(--accent);margin-bottom:8px;display:flex;align-items:center;gap:8px}
.mod p{color:var(--text-muted);font-size:14px;margin-bottom:8px}
.mod ul{list-style:none;padding:0}
.mod ul li{padding:6px 0 6px 18px;position:relative;font-size:14px;color:#ccc}
.mod ul li::before{content:'›';position:absolute;left:0;color:var(--accent);font-weight:700}

/* --- Steps / Process --- */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-top:12px}
.step{
  padding:18px 16px;background:rgba(30,42,56,.4);border-radius:10px;
  border-left:3px solid var(--accent);transition:all .2s;
}
.step:hover{background:rgba(30,42,56,.7)}
.step h3{font-size:15px;font-weight:700;color:#fff;margin-bottom:6px}
.step p{font-size:13px;color:var(--text-muted)}

/* --- FAQ --- */
.faq details{
  padding:14px 0;border-bottom:1px solid var(--border-dim);cursor:pointer;
}
.faq details:last-child{border-bottom:none}
.faq summary{
  font-size:14px;font-weight:600;color:#fff;list-style:none;display:flex;align-items:center;gap:8px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{
  content:'+';color:var(--accent);font-size:18px;font-weight:700;flex-shrink:0;
  transition:transform .2s;
}
.faq details[open] summary::before{content:'−'}
.faq details p{font-size:13px;color:var(--text-muted);margin-top:8px;padding-left:26px}

/* --- Cols --- */
.cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-top:10px}
.cols .meta{font-size:12px;font-weight:600;text-transform:uppercase;color:var(--accent);letter-spacing:1px;margin-bottom:8px}
.list{list-style:none;padding:0}
.list li{padding:6px 0;font-size:14px}
.list li a{color:#ccc}
.list li a:hover{color:var(--accent)}

/* --- Contact Box --- */
.contactBox{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;
  padding:18px 20px;background:rgba(30,42,56,.5);border-radius:10px;border:1px solid var(--border-dim);
}

/* --- Table (数据表模块) --- */
.dataTable{width:100%;border-collapse:collapse;font-size:13px;margin-top:10px}
.dataTable th,.dataTable td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border-dim)}
.dataTable th{color:var(--accent);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.5px}
.dataTable tr:hover td{background:rgba(30,42,56,.5)}

/* --- Tags / 关键词标签云 --- */
.tagCloud{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.tag{
  padding:5px 14px;border-radius:20px;font-size:12px;font-weight:500;
  background:rgba(30,42,56,.5);border:1px solid var(--border-dim);color:var(--text-muted);
  transition:all .2s;
}
.tag:hover{background:var(--accent);color:#000;border-color:var(--accent)}

/* --- Disclaimer --- */
.disclaimer{
  font-size:12px;color:var(--text-muted);padding:16px 20px;background:rgba(30,42,56,.3);
  border-radius:8px;border:1px solid var(--border-dim);line-height:1.5;
}

/* --- Footer --- */
footer{
  text-align:center;padding:30px 20px;font-size:12px;color:var(--text-muted);border-top:1px solid var(--border-dim);margin-top:10px;
}

/* --- Reveal animation --- */
.reveal{animation:fadeUp .5s ease-out both}
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}

/* --- Responsive --- */
@media(max-width:768px){
  .topbar{flex-direction:column;gap:10px;padding:12px 16px}
  .heroInner{flex-direction:column}
  .heroMedia{flex:unset;width:100%;max-width:400px;margin:0 auto}
  .heroCard{padding:24px 18px}
  .card.pad{padding:20px 16px}
  .linkGrid{grid-template-columns:1fr 1fr}
  .gaugeGrid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
}
@media(max-width:480px){
  .linkGrid{grid-template-columns:1fr}
  .ctaRow{flex-direction:column}
  .ctaRow .btn{width:100%;justify-content:center}
}