:root{
  --bg:#0b1220;
  --card:#101a2e;
  --text:#e9eefc;
  --muted:#a7b3d7;
  --line:rgba(255,255,255,.10);
  --brand:#4aa3ff;
  --brand2:#7cf7c9;
  --shadow: 0 18px 40px rgba(0,0,0,.35);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;
  background: radial-gradient(1000px 600px at 20% 0%, rgba(74,163,255,.22), transparent 60%),
              radial-gradient(900px 540px at 80% 10%, rgba(124,247,201,.14), transparent 55%),
              var(--bg);
  color:var(--text);
  line-height:1.7;
}

a{color:var(--text);text-decoration:none}
a:hover{opacity:.88}
img{max-width:100%;height:auto;border-radius:16px}

.container{width:min(1120px, 92%); margin:0 auto}

.header{
  position:sticky; top:0; z-index:20;
  backdrop-filter: blur(10px);
  background: rgba(11,18,32,.72);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 0;
}

.logo{display:flex; flex-direction:column; gap:4px}
.logo-main{font-weight:800; letter-spacing:.02em}
.logo-sub{font-size:12px; color:var(--muted)}

.nav{
  display:flex; gap:18px; align-items:center;
}
.nav a{
  color:var(--muted);
  padding:8px 10px;
  border-radius:12px;
}
.nav a.active{color:var(--text); background:rgba(255,255,255,.06)}
.nav a.btn{color:var(--bg)}

.nav-toggle{
  display:none;
  border:1px solid var(--line);
  background:rgba(255,255,255,.06);
  color:var(--text);
  border-radius:12px;
  padding:8px 12px;
  cursor:pointer;
}

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:10px 14px;
  border-radius:14px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.06);
  color:var(--text);
  font-weight:700;
  box-shadow:none;
}
.btn.primary{
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  color:#071019;
  border:0;
}
.btn.ghost{
  background:transparent;
}
.btn-row{display:flex; gap:12px; flex-wrap:wrap}
.btn-row.center{justify-content:center}

.hero{
  padding:38px 0 20px;
}
.hero-inner{
  display:grid;
  grid-template-columns: 1.2fr .9fr;
  gap:26px;
  align-items:center;
}
.hero h1{
  font-size: clamp(28px, 4vw, 44px);
  margin:0 0 10px;
  letter-spacing:.02em;
}
.lead{color:var(--muted); margin:0 0 16px}

.hero-cta{display:flex; gap:12px; flex-wrap:wrap; margin:12px 0 18px}

.quick-info{
  display:grid;
  gap:10px;
  margin-top:10px;
}
.qi-item{
  border:1px solid var(--line);
  background: rgba(255,255,255,.04);
  border-radius:16px;
  padding:12px 14px;
}
.qi-label{color:var(--muted); font-size:12px}
.qi-value{font-weight:650}

.section{
  padding:38px 0;
}
.section.alt{
  background: rgba(255,255,255,.03);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.section-title{
  font-size:22px;
  margin:0 0 14px;
}

.cards{margin-top:18px}
.card{
  border:1px solid var(--line);
  background: rgba(16,26,46,.78);
  border-radius:18px;
  padding:18px;
  box-shadow: var(--shadow);
}
.card h2, .card h3{margin-top:0}
.mt{margin-top:18px}

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

.product{align-items:center}
.product-text .note{margin-top:12px}

.checklist{padding-left:20px; margin:0}
.checklist li{margin:8px 0}
.small{font-size:12px}
.muted{color:var(--muted)}
.note{
  padding:12px 14px;
  border:1px dashed rgba(255,255,255,.18);
  border-radius:16px;
  background: rgba(255,255,255,.03);
}

.table-wrap{overflow:auto; border-radius:16px; border:1px solid var(--line)}
.table{width:100%; border-collapse:collapse; min-width:520px}
.table th, .table td{
  padding:12px 14px;
  border-bottom:1px solid var(--line);
}
.table th{text-align:left; color:var(--muted); width:200px}
.table tr:last-child th, .table tr:last-child td{border-bottom:0}

.steps{padding-left:20px; margin:0}
.steps li{margin:10px 0}

.badge-row{display:flex; gap:10px; flex-wrap:wrap; margin-top:12px}
.badge{
  font-size:12px;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.04);
}

.page-head{
  padding:26px 0 0;
}
.page-head h1{margin:0}
.page-head p{margin:6px 0 0}

.cta{
  padding:34px 0;
  border-top:1px solid var(--line);
  background: linear-gradient(135deg, rgba(74,163,255,.15), rgba(124,247,201,.08));
}
.cta-inner{
  display:flex; align-items:center; justify-content:space-between;
  gap:16px; flex-wrap:wrap;
}

.footer{
  padding:28px 0;
  border-top:1px solid var(--line);
  background: rgba(0,0,0,.12);
}
.footer-inner{
  display:flex; justify-content:space-between; gap:20px; flex-wrap:wrap;
}
.footer-title{font-weight:800}
.footer-text{color:var(--muted); font-size:13px}
.footer-links{display:flex; gap:14px; flex-wrap:wrap}
.footer-links a{color:var(--muted)}

@media (max-width: 900px){
  .hero-inner{grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .nav-toggle{display:inline-flex}
  .nav{
    position:absolute;
    right:4%;
    top:64px;
    display:none;
    flex-direction:column;
    gap:8px;
    padding:12px;
    border:1px solid var(--line);
    border-radius:16px;
    background: rgba(11,18,32,.92);
    width:min(360px, 92vw);
  }
  .nav.show{display:flex}
}

/* ===== Hero Slider ===== */
.slider{
  position: relative;
  width: 100%;
  aspect-ratio: 13 / 16;          /* 可以改成 16/9 或 4/3 */
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  box-shadow: var(--shadow);
}

.slider .slide{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;            /* 保持好看铺满 */
  opacity: 0;
  transition: opacity 0.8s ease;
}

.slider .slide.active{
  opacity: 1;
}