:root{
  --bg:#0b1220;
  --card:#111b2e;
  --text:#e8eefc;
  --muted:#a9b7da;
  --brand:#4ea3ff;
  --brand2:#7c5cff;
  --border:rgba(255,255,255,.10);
  --shadow:0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: system-ui,-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",Arial,sans-serif;
  color:var(--text);
  background: radial-gradient(1200px 600px at 20% 0%, rgba(78,163,255,.18), transparent 60%),
              radial-gradient(900px 500px at 80% 10%, rgba(124,92,255,.16), transparent 55%),
              var(--bg);
  line-height:1.7;
}
a{color:var(--brand); text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(1100px, 92vw); margin:0 auto}
header{
  position:sticky; top:0; z-index:20;
  background: rgba(11,18,32,.78);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--border);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 0;
  gap:16px;
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-weight:800; letter-spacing:.2px;
  color:var(--text);
}
.brand-badge{
  width:34px; height:34px; border-radius:10px;
  background: linear-gradient(135deg, rgba(78,163,255,.95), rgba(124,92,255,.95));
  box-shadow: var(--shadow);
  display:grid; place-items:center;
  font-weight:900;
}
nav ul{list-style:none; display:flex; gap:14px; margin:0; padding:0; flex-wrap:wrap}
nav a{color:var(--text); opacity:.92; padding:6px 8px; border-radius:10px}
nav a:hover{background: rgba(255,255,255,.04); text-decoration:none}
nav a[aria-current="page"]{color:var(--brand); opacity:1; font-weight:800}
.breadcrumbs{
  font-size:13px;
  color:var(--muted);
  padding:12px 0 0;
}
.breadcrumbs a{color:var(--muted)}
main{padding:14px 0 44px}
.hero{padding:34px 0 10px}
.hero-grid{
  display:grid; grid-template-columns: 1.2fr .8fr;
  gap:18px; align-items:stretch;
}
@media (max-width: 900px){ .hero-grid{grid-template-columns:1fr} }
.card{
  background: rgba(17,27,46,.75);
  border:1px solid var(--border);
  border-radius:16px;
  box-shadow: var(--shadow);
}
.hero .card{padding:22px}
h1,h2,h3{line-height:1.25}
h1{font-size:34px; margin:0 0 12px}
h2{margin:0 0 10px}
section{margin-top:22px}
.p16{padding:16px}
.subtitle{color:var(--muted); margin:0 0 16px}
.muted{color:var(--muted)}
.cta{display:flex; gap:12px; flex-wrap:wrap; margin-top:14px}
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:10px;
  border-radius:12px;
  padding:10px 14px;
  border:1px solid var(--border);
  color:var(--text);
  background: rgba(255,255,255,.04);
  text-decoration:none;
}
.btn-primary{
  background: linear-gradient(135deg, rgba(78,163,255,.95), rgba(124,92,255,.95));
  border-color: transparent;
  color:#081023;
  font-weight:900;
}
.grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:14px}
@media (max-width: 900px){ .grid-3{grid-template-columns:1fr} }
.tag{
  display:inline-block;
  padding:2px 10px;
  border:1px solid var(--border);
  border-radius:999px;
  font-size:12px;
  color:var(--muted);
  margin-right:8px;
}
.note{
  padding:14px 16px;
  border-left:4px solid var(--brand);
  background: rgba(78,163,255,.08);
  border-radius:12px;
  border:1px solid rgba(78,163,255,.18);
}
.kpi{
  display:grid; grid-template-columns:repeat(2,1fr);
  gap:12px;
  margin-top:10px;
}
.kpi .item{
  padding:14px;
  border-radius:14px;
  background: rgba(255,255,255,.03);
  border:1px solid var(--border);
}
.kpi .num{font-weight:900; font-size:18px}
.kpi .label{color:var(--muted); font-size:13px}

/* SEO/可用性：锚点定位不被吸顶头遮挡 */
.anchor{
  scroll-margin-top: 92px;
}

.table{
  width:100%;
  border-collapse:collapse;
  overflow:hidden;
  border-radius:14px;
  border:1px solid var(--border);
}
.table th, .table td{
  padding:12px 12px;
  border-bottom:1px solid var(--border);
  vertical-align:top;
}
.table th{background: rgba(255,255,255,.03); text-align:left}

.faq details{
  background: rgba(255,255,255,.03);
  border:1px solid var(--border);
  border-radius:14px;
  padding:12px 14px;
  margin:10px 0;
}
.faq summary{cursor:pointer; font-weight:800}

input, textarea{
  width:100%;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.04);
  color: var(--text);
  outline: none;
}
textarea{min-height:120px; resize:vertical}
label{display:block; font-size:13px; color:var(--muted); margin:10px 0 6px}
.sr-only{
  position:absolute; width:1px; height:1px;
  padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}
footer{
  border-top:1px solid var(--border);
  padding:18px 0;
  color:var(--muted);
  font-size:13px;
}