:root{
  --bg:#050816;
  --bg2:#0b1025;
  --card:rgba(255,255,255,.06);
  --card2:rgba(255,255,255,.08);
  --stroke:rgba(255,255,255,.12);
  --text:#eaf0ff;
  --muted:#9aa8c7;
  --primary:#7c3aed;
  --primary2:#22d3ee;
  --accent:#4ade80;
  --shadow:0 20px 60px rgba(0,0,0,.35);
  --radius:20px;
  --radius-lg:28px;
  --max:1200px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}

body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);
  background:
    radial-gradient(circle at top left, rgba(124,58,237,.25), transparent 35%),
    radial-gradient(circle at top right, rgba(34,211,238,.18), transparent 28%),
    radial-gradient(circle at 20% 80%, rgba(74,222,128,.12), transparent 26%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  min-height:100vh;
  overflow-x:hidden;
  line-height:1.6;
}

a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

.container{
  width:min(100% - 32px, var(--max));
  margin-inline:auto;
}

/* 背景 */
.bg-grid{
  position:fixed;
  inset:0;
  pointer-events:none;
  opacity:.28;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size:72px 72px;
  mask-image:radial-gradient(circle at center, black 25%, transparent 85%);
  z-index:0;
}
.glow{
  position:fixed;
  width:420px;height:420px;
  border-radius:50%;
  filter:blur(110px);
  opacity:.22;
  pointer-events:none;
  z-index:0;
}
.glow.one{top:60px;left:-120px;background:#7c3aed}
.glow.two{top:180px;right:-120px;background:#22d3ee}
.glow.three{bottom:-120px;left:25%;background:#4ade80}

/* Header */
header{
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter:blur(18px);
  background:rgba(5,8,22,.55);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  min-height:74px;
  gap:16px;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  font-weight:700;
  letter-spacing:.5px;
}
.logo{
  width:38px;height:38px;
  border-radius:12px;
  background:linear-gradient(135deg, var(--primary), var(--primary2));
  display:grid;
  place-items:center;
  box-shadow:0 10px 30px rgba(124,58,237,.35);
  position:relative;
  overflow:hidden;
  flex:0 0 auto;
}
.logo span{
  position:relative;
  z-index:1;
  font-size:18px;
  font-weight:900;
  color:#fff;
}
.brand-name{
  line-height:1.1;
}
.brand-name small{
  display:block;
  color:var(--muted);
  font-weight:500;
  font-size:12px;
  margin-top:3px;
}
.nav-links{
  display:flex;
  align-items:center;
  gap:26px;
  color:#dbe5ff;
  font-size:14px;
}
.nav-links a{
  position:relative;
  padding:8px 0;
  color:var(--muted);
  transition:.25s ease;
}
.nav-links a:hover{color:var(--text)}
.nav-links a::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:0;height:2px;
  border-radius:2px;
  background:linear-gradient(90deg, var(--primary), var(--primary2));
  transition:.25s ease;
}
.nav-links a:hover::after{width:100%}

.nav-actions{
  display:flex;
  align-items:center;
  gap:12px;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 18px;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.06);
  color:var(--text);
  font-weight:600;
  transition:.25s ease;
  cursor:pointer;
  white-space:nowrap;
}
.btn:hover{
  transform:translateY(-1px);
  background:rgba(255,255,255,.1);
}
.btn.primary{
  border:none;
  background:linear-gradient(135deg, var(--primary), var(--primary2));
  color:#fff;
  box-shadow:0 16px 30px rgba(34,211,238,.18);
}
.menu-btn{
  display:none;
  width:44px;height:44px;
  border-radius:14px;
}

/* Hero */
.hero{
  position:relative;
  z-index:1;
  padding:84px 0 40px;
}
.hero-wrap{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:28px;
  align-items:center;
  min-height:calc(100vh - 110px);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  border-radius:999px;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.1);
  color:#d9e4ff;
  font-size:13px;
  margin-bottom:18px;
}
.dot{
  width:8px;height:8px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 18px rgba(74,222,128,.9);
}

h1{
  margin:0;
  font-size:clamp(40px, 6vw, 72px);
  line-height:1.05;
  letter-spacing:-.03em;
  max-width:12ch;
}
.grad{
  background:linear-gradient(135deg, #ffffff 0%, #c7d2fe 45%, #67e8f9 100%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero p{
  color:var(--muted);
  font-size:18px;
  line-height:1.8;
  max-width:58ch;
  margin:22px 0 28px;
}
.hero-actions{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
  margin-bottom:26px;
}
.hero-stats{
  display:flex;
  gap:18px;
  flex-wrap:wrap;
  margin-top:8px;
}
.stat{
  min-width:148px;
  padding:16px 18px;
  border-radius:18px;
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.1);
  box-shadow:var(--shadow);
  backdrop-filter:blur(12px);
}
.stat strong{
  display:block;
  font-size:22px;
  margin-bottom:4px;
}
.stat span{
  color:var(--muted);
  font-size:13px;
}

.hero-card{
  position:relative;
  padding:24px;
  border-radius:var(--radius-lg);
  background:linear-gradient(180deg, rgba(255,255,255,.09), rgba(255,255,255,.05));
  border:1px solid rgba(255,255,255,.12);
  box-shadow:var(--shadow);
  overflow:hidden;
}
.hero-card::before{
  content:"";
  position:absolute;
  inset:-1px;
  background:linear-gradient(135deg, rgba(124,58,237,.28), rgba(34,211,238,.18), rgba(74,222,128,.12));
  filter:blur(38px);
  opacity:.5;
  z-index:0;
}
.hero-card > *{position:relative;z-index:1}
.card-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:18px;
}
.chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border-radius:999px;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.1);
  font-size:12px;
  color:#dbe5ff;
}
.pulse{
  width:8px;height:8px;border-radius:50%;
  background:#67e8f9;
  box-shadow:0 0 0 0 rgba(103,232,249,.6);
  animation:pulse 2s infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(103,232,249,.55)}
  70%{box-shadow:0 0 0 14px rgba(103,232,249,0)}
  100%{box-shadow:0 0 0 0 rgba(103,232,249,0)}
}

.card-grid{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:14px;
}
.mini{
  padding:16px;
  border-radius:18px;
  background:rgba(10,15,35,.55);
  border:1px solid rgba(255,255,255,.08);
  min-height:122px;
}
.mini h3{
  margin:0 0 8px;
  font-size:16px;
}
.mini p{
  margin:0;
  color:var(--muted);
  font-size:13px;
  line-height:1.7;
}
.mini .tag{
  display:inline-flex;
  margin-top:12px;
  padding:6px 10px;
  border-radius:999px;
  background:rgba(34,211,238,.12);
  border:1px solid rgba(34,211,238,.18);
  color:#b8f4ff;
  font-size:12px;
}

/* Section */
section{
  position:relative;
  z-index:1;
  padding:72px 0;
}
.section-title{
  margin-bottom:30px;
}
.section-title h2{
  margin:0 0 12px;
  font-size:clamp(28px, 4vw, 42px);
  line-height:1.15;
}
.section-title p{
  margin:0;
  color:var(--muted);
  max-width:100ch;
  line-height:1.8;
}

.grid-4{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}
.grid-3{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
}
.grid-2{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:18px;
}

.card{
  padding:22px;
  border-radius:var(--radius);
  background:linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.04));
  border:1px solid rgba(255,255,255,.1);
  box-shadow:var(--shadow);
  backdrop-filter:blur(12px);
  transition:.25s ease;
}
.card:hover{
  transform:translateY(-3px);
  border-color:rgba(34,211,238,.2);
  box-shadow:0 24px 60px rgba(0,0,0,.42);
}
.icon{
  width:52px;height:52px;
  border-radius:16px;
  display:grid;
  place-items:center;
  margin-bottom:16px;
  background:linear-gradient(135deg, rgba(124,58,237,.24), rgba(34,211,238,.16));
  border:1px solid rgba(255,255,255,.12);
  font-size:24px;
}
.card h3{
  margin:0 0 10px;
  font-size:20px;
}
.card p{
  color:var(--muted);
  line-height:1.75;
  margin:0;
}

.model-list{
  list-style:none;
  padding:0;
  margin:16px 0 0;
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.model-list li{
  padding:8px 12px;
  border-radius:999px;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.1);
  color:#dbe5ff;
  font-size:13px;
}

.scene-item{
  display:flex;
  gap:14px;
  align-items:flex-start;
}
.scene-item .num{
  width:38px;height:38px;
  border-radius:12px;
  flex:0 0 38px;
  display:grid;
  place-items:center;
  background:linear-gradient(135deg, rgba(124,58,237,.28), rgba(34,211,238,.18));
  border:1px solid rgba(255,255,255,.12);
  font-weight:700;
  color:#fff;
}
.scene-item h3{
  margin:0 0 6px;
  font-size:18px;
}
.scene-item p{
  margin:0;
  color:var(--muted);
  line-height:1.7;
}

/* FAQ */
.faq{
  display:grid;
  gap:14px;
}
details{
  border-radius:18px;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.1);
  padding:18px 20px;
  box-shadow:var(--shadow);
}
summary{
  cursor:pointer;
  list-style:none;
  font-weight:700;
  font-size:16px;
  outline:none;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
summary::-webkit-details-marker{display:none}
summary::after{
  content:"+";
  color:#cbd5ff;
  font-size:22px;
  line-height:1;
}
details[open] summary::after{content:"–"}
details p{
  color:var(--muted);
  line-height:1.8;
  margin:14px 0 0;
}

/* CTA */
.cta{
  padding:34px;
  border-radius:30px;
  background:
    radial-gradient(circle at top left, rgba(124,58,237,.25), transparent 34%),
    radial-gradient(circle at bottom right, rgba(34,211,238,.18), transparent 35%),
    linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.04));
  border:1px solid rgba(255,255,255,.12);
  box-shadow:var(--shadow);
  display:flex;
  justify-content:space-between;
  gap:22px;
  align-items:center;
  flex-wrap:wrap;
}
.cta h2{
  margin:0 0 10px;
  font-size:clamp(26px, 4vw, 38px);
}
.cta p{
  margin:0;
  color:var(--muted);
  line-height:1.8;
  max-width:60ch;
}

/* Footer */
footer{
  position:relative;
  z-index:1;
  padding:30px 0 50px;
  color:var(--muted);
  border-top:1px solid rgba(255,255,255,.08);
  margin-top:40px;
}
.footer-wrap{
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  align-items:center;
}
.footer-links{
  display:flex;
  gap:18px;
  flex-wrap:wrap;
}
.footer-links a:hover{color:var(--text)}

/* Responsive */
@media (max-width: 1100px){
  .hero-wrap{grid-template-columns:1fr; min-height:auto; padding-top:30px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
}

@media (max-width: 768px){
  .nav-links{
    position:fixed;
    left:16px;
    right:16px;
    top:84px;
    flex-direction:column;
    align-items:flex-start;
    padding:18px;
    gap:14px;
    border-radius:20px;
    background:rgba(5,8,22,.95);
    border:1px solid rgba(255,255,255,.1);
    box-shadow:var(--shadow);
    display:none;
  }
  .nav-links.show{display:flex}
  .menu-btn{display:inline-flex}
  .nav-actions .btn:not(.primary){display:none}
  .grid-4,.grid-3,.grid-2{grid-template-columns:1fr}
  .hero{padding-top:40px}
  .hero p{font-size:16px}
  .card-grid{grid-template-columns:1fr}
  .cta{padding:24px}
  .hero-stats{gap:12px}
  .stat{min-width:unset; flex:1 1 140px}
}