:root{
  --brand:#0b6bff; --brand-d:#0050c8; --amber:#ff9f1c; --ink:#16233b;
  --muted:#5b6b85; --bg:#f6f8fc; --line:#e3e9f2; --card:#fff;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}

/* ===== 顶部导航 ===== */
.nav-top{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line)}
.nav-in{max-width:1120px;margin:0 auto;padding:0 20px;height:64px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--ink)}
.logo .dot{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--brand),#37a0ff);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px}
.nav-links{display:flex;gap:22px;margin-left:auto}
.nav-links a{color:var(--ink);font-size:15px}
.nav-links a:hover{color:var(--brand);text-decoration:none}
.nav-cta{background:var(--brand);color:#fff!important;height:36px;display:inline-flex;align-items:center;padding:0 16px;border-radius:8px;font-size:14px}
.nav-cta:hover{background:var(--brand-d);text-decoration:none}
.nav-login{color:var(--brand)!important;font-size:14px;height:36px;display:inline-flex;align-items:center;padding:0 16px;border-radius:8px;border:1px solid var(--brand);background:#fff}
.nav-login:hover{background:var(--brand);color:#fff!important;text-decoration:none}
.nav-burger{display:none;margin-left:auto;background:none;border:0;font-size:22px;cursor:pointer;color:var(--ink)}

/* ===== 通用区块 ===== */
.hero{background:linear-gradient(150deg,#0b6bff 0%,#0050c8 55%,#0a3f8f 100%);color:#fff;padding:68px 0 62px}
.hero h1{font-size:34px;line-height:1.3;font-weight:700}
.hero p.sub{font-size:16px;color:#dce8ff;margin-top:16px;max-width:640px}
.hero .cta-row{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 22px;border-radius:10px;font-size:15px;font-weight:600}
.btn-w{background:#fff;color:var(--brand)}
.btn-o{background:transparent;border:1px solid rgba(255,255,255,.6);color:#fff}
.btn-b{background:var(--brand);color:#fff}
.btn-b:hover{background:var(--brand-d);text-decoration:none}
.section{padding:70px 0}
.section .h2{font-size:28px;font-weight:700;text-align:center}
.section .h2-s{text-align:center;color:var(--muted);margin-top:8px;font-size:16px}
.sec-head{margin-bottom:44px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px}
.card .ic{width:46px;height:46px;border-radius:11px;background:#eaf2ff;color:var(--brand);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:14px}
.card h3{font-size:17px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14.5px}
.two{display:grid;grid-template-columns:1.1fr .9fr;gap:34px;align-items:center}
.muted{color:var(--muted)}
.stat-row{display:flex;gap:22px;justify-content:center;flex-wrap:wrap;margin-top:40px}
.stat{text-align:center;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:14px;padding:20px 34px}
.stat b{font-size:26px;display:block}
.stat span{font-size:13px;color:#dce8ff}
.alt{background:#fff}
ul.check{list-style:none}
ul.check li{padding-left:28px;position:relative;margin-bottom:9px;color:var(--ink)}
ul.check li:before{content:"✓";position:absolute;left:0;top:0;color:var(--brand);font-weight:700}

/* ===== 帮助/文字内容页 ===== */
.shell{padding:44px 0 70px}
.crumbs{font-size:13.5px;color:var(--muted);margin-bottom:22px}
.doc{background:#fff;border:1px solid var(--line);border-radius:14px;padding:40px 48px}
.doc h1{font-size:28px;margin-bottom:6px}
.doc h2{font-size:21px;margin:30px 0 12px;padding-top:10px;border-top:1px solid var(--line)}
.doc h3{font-size:17px;margin:22px 0 8px}
.doc p,.doc li{margin-bottom:8px}
.doc ul,.doc ol{margin:6px 0 12px 22px}
.doc table{width:100%;border-collapse:collapse;margin:12px 0 18px;font-size:14px}
.doc th,.doc td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.doc th{background:#f1f6ff}
.doc code,.doc .kbd{background:#eef2f8;border:1px solid var(--line);border-radius:5px;padding:1px 7px;font-size:13px}
.doc blockquote{border-left:4px solid var(--amber);background:#fff8ec;padding:10px 16px;border-radius:0 8px 8px 0;margin:12px 0}
.toc{background:#f6f9ff;border:1px solid var(--line);border-radius:10px;padding:16px 22px;font-size:14px}
.toc a{display:block;padding:2px 0;color:var(--ink)}
.toc a:hover{color:var(--brand);text-decoration:none}

/* ===== 定价 ===== */
.price-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px;margin-top:30px}
.pcol{background:#fff;border:1px solid var(--line);border-radius:14px;padding:30px;text-align:center}
.pcol.hot{border:2px solid var(--brand);box-shadow:0 10px 30px rgba(11,107,255,.12)}
.pcol h3{font-size:18px}
.pcol .price{font-size:34px;font-weight:700;color:var(--brand);margin:14px 0 4px}
.pcol ul{list-style:none;text-align:left;margin-top:18px;font-size:14px;color:var(--muted)}
.pcol li{padding:6px 0;border-bottom:1px dashed var(--line)}
.pcol .btn{margin-top:20px}
.tag{display:inline-block;background:var(--amber);color:#fff;font-size:12px;border-radius:99px;padding:2px 10px;margin-left:8px;vertical-align:middle}

/* ===== 底部 ===== */
.footer{background:#0e1a33;color:#b7c3db;font-size:14px;padding:46px 0 34px}
.footer .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:28px}
.footer h4{color:#fff;font-size:15.5px;margin-bottom:12px}
.footer a{color:#b7c3db;display:block;padding:4px 0}
.footer a:hover{color:#fff;text-decoration:none}
.cright{margin-top:34px;border-top:1px solid #22335a;padding-top:18px;text-align:center;color:#7d8bb0;font-size:13px}

/* ===== 打印(帮助/宣传) ===== */
@media print{
  .nav-top,.footer,.btn,.crumbs,.no-print{display:none!important}
  body{background:#fff}
  .doc,.shell{margin:0;padding:0;border:0}
  .doc{max-width:none}
  a{color:inherit;text-decoration:none}
}
@media(max-width:820px){
  .hero h1{font-size:30px}
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:16px 24px;border-bottom:1px solid var(--line)}
  .nav-links.open{display:flex}
  .nav-burger{display:block}
  .two{grid-template-columns:1fr}
  .wrap{overflow:hidden}
}