:root{
  --bg:#0b1026;--card:#121a2f;--primary:#4f9bff;--text:#e6e8ee;--sub:#9aa3c0;--ok:#22c55e;--warn:#f59e0b;
}
*{box-sizing:border-box;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial}
body{margin:0;background:radial-gradient(1200px 600px at 50% -10%,#1b2547,#0b1026);color:var(--text);line-height:1.6}
header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid rgba(255,255,255,.06);backdrop-filter:blur(8px)}
header .brand{font-weight:700;letter-spacing:.5px}
header .nav{display:flex;gap:14px;align-items:center}
header a{color:var(--sub);text-decoration:none}
header a.active,header a:hover{color:var(--text)}
/* 窄屏：品牌名 + 4 个链接 + 点数挤在一行会溢出 */
@media (max-width:600px){
  header{flex-wrap:wrap;gap:8px;padding:12px 14px}
  header .nav{flex-wrap:wrap;gap:6px 12px;font-size:14px}
}
.credits{display:flex;gap:8px;align-items:center;background:rgba(79,155,255,.18);padding:6px 10px;border-radius:999px}
.container{max-width:980px;margin:0 auto;padding:28px 18px;display:flex;flex-direction:column;gap:18px}
.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}
.card{background:linear-gradient(180deg,rgba(255,255,255,.02),transparent);border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:22px;box-shadow:0 40px 60px -40px rgba(79,155,255,.25)}
.hero h1{margin:0;font-size:34px}
.hero p{color:var(--sub);margin:10px 0 18px}
.actions{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:10px 18px;text-decoration:none;border:1px solid transparent}
.btn-primary{background:linear-gradient(90deg,#4f9bff,#7aa8ff);color:#fff}
.btn-ghost{border-color:rgba(255,255,255,.16);color:var(--text)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.pkg{display:flex;flex-direction:column;gap:10px;position:relative;overflow:hidden}
.pkg.popular::after{content:"最受欢迎";position:absolute;top:14px;right:-36px;transform:rotate(45deg);background:linear-gradient(90deg,#22d3ee,#4f9bff);padding:4px 40px;font-size:12px}
.pkg-header{display:flex;align-items:baseline;justify-content:space-between}
.pkg-price{font-size:28px;font-weight:700}
.pkg-price span{font-size:14px;color:var(--sub);margin-left:6px}
.pkg-list{margin:0;padding-left:18px;color:var(--sub);display:flex;flex-direction:column;gap:6px}
.form{display:flex;flex-direction:column;gap:12px}
input{background:transparent;border:1px solid rgba(255,255,255,.14);border-radius:12px;padding:10px 14px;color:var(--text)}
.notice{color:var(--sub);font-size:14px}
footer{padding:20px;text-align:center;color:var(--sub)}
footer a{color:var(--sub);text-decoration:none;margin:0 8px}
footer a:hover{color:var(--text)}

/* 文档页（使用说明 / 协议 / 隐私） */
.doc{max-width:760px;margin:0 auto}
.doc h1{margin:0 0 6px;font-size:28px}
.doc h2{margin:26px 0 8px;font-size:19px}
.doc h3{margin:18px 0 6px;font-size:16px;color:#cdd6f4}
.doc p,.doc li{color:#c3cada}
.doc ul,.doc ol{padding-left:22px;margin:8px 0}
.doc li{margin:4px 0}
.doc .meta{color:var(--sub);font-size:13px;margin-bottom:6px}
.doc code{background:rgba(255,255,255,.08);padding:1px 6px;border-radius:6px}
.doc .callout{background:rgba(79,155,255,.10);border:1px solid rgba(79,155,255,.25);border-radius:12px;padding:12px 14px;margin:14px 0}
.doc .callout.warn{background:rgba(245,158,11,.12);border-color:rgba(245,158,11,.35);color:#fde68a}
.steps{counter-reset:step;list-style:none;padding-left:0}
.steps li{counter-increment:step;position:relative;padding-left:38px;margin:12px 0}
.steps li::before{content:counter(step);position:absolute;left:0;top:2px;width:24px;height:24px;border-radius:50%;background:linear-gradient(90deg,#4f9bff,#7aa8ff);color:#fff;font-size:13px;text-align:center;line-height:24px}
@media(max-width:880px){.hero{grid-template-columns:1fr}}