:root{
  --ink:#16213a; --muted:#5b6478; --line:#e6e8ef; --bg:#ffffff;
  --soft:#f6f7fb; --brand:#0c6efc; --brand-dark:#0a58ca; --accent:#7a4de8;
  --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-dark)}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* header */
header.site{position:sticky;top:0;background:#fff;border-bottom:1px solid var(--line);z-index:50}
.hd{display:flex;align-items:center;gap:28px;height:64px}
.logo{font-size:26px;font-weight:800;letter-spacing:1px;color:var(--ink)}
.logo span{color:var(--brand)}
nav.main{display:flex;gap:20px;flex:1;flex-wrap:wrap}
nav.main a{color:var(--ink);font-size:15px}
nav.main a:hover{color:var(--brand)}
.langs{display:flex;gap:6px;font-size:13px}
.langs a{color:var(--muted);padding:4px 8px;border:1px solid var(--line);border-radius:20px}
.langs a.on,.langs a:hover{color:#fff;background:var(--brand);border-color:var(--brand)}
.burger{display:none;font-size:24px;background:none;border:0;cursor:pointer}
@media(max-width:860px){
  nav.main{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;
    flex-direction:column;padding:16px 20px;border-bottom:1px solid var(--line)}
  nav.main.open{display:flex}
  .burger{display:block;margin-left:auto}
  .langs{margin-left:auto}
}

/* hero */
.hero{background:linear-gradient(135deg,#0c6efc 0%,#7a4de8 100%);color:#fff;
  padding:72px 0;text-align:center}
.hero h1{font-size:40px;line-height:1.3;margin-bottom:16px}
.hero p{font-size:18px;opacity:.92;max-width:720px;margin:0 auto 28px}
@media(max-width:640px){.hero h1{font-size:28px}}
.btn{display:inline-block;background:#fff;color:var(--brand);font-weight:700;
  padding:13px 30px;border-radius:30px;font-size:16px}
.btn:hover{background:#eef4ff;color:var(--brand-dark)}
.btn.brand{background:var(--brand);color:#fff}
.btn.brand:hover{background:var(--brand-dark)}

/* page head */
.phead{background:var(--soft);padding:48px 0;border-bottom:1px solid var(--line)}
.phead h1{font-size:32px}
.phead p{color:var(--muted);margin-top:8px;max-width:760px}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:10px}
.crumbs a{color:var(--muted)}

/* content */
main.page{padding:44px 0 64px}
article h2{font-size:24px;margin:36px 0 12px;padding-top:8px}
article h3{font-size:19px;margin:24px 0 8px}
article p{margin:12px 0}
article ul,article ol{margin:12px 0 12px 24px}
article li{margin:6px 0}
.lede{font-size:18px;color:var(--muted)}

/* cards */
.grid{display:grid;gap:20px;margin:28px 0}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
@media(max-width:860px){.grid.c3,.grid.c4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.grid.c2,.grid.c3,.grid.c4{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;transition:box-shadow .2s}
.card:hover{box-shadow:0 8px 24px rgba(22,33,58,.08)}
.card h3{margin:0 0 8px;font-size:18px}
.card p{color:var(--muted);font-size:15px;margin:0}
.card .ic{font-size:28px;margin-bottom:10px}
a.card{color:var(--ink)}
a.card h3{color:var(--brand)}

/* table */
table.tb{width:100%;border-collapse:collapse;margin:20px 0;font-size:15px}
table.tb th,table.tb td{border:1px solid var(--line);padding:10px 14px;text-align:left}
table.tb th{background:var(--soft)}
table.tb tr:nth-child(even) td{background:#fbfbfd}

/* faq */
details.faq{border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin:10px 0}
details.faq summary{font-weight:600;cursor:pointer}
details.faq p{margin-top:10px;color:var(--muted)}

/* cta band */
.cta{background:linear-gradient(135deg,#0c6efc,#7a4de8);color:#fff;text-align:center;
  border-radius:var(--radius);padding:44px 24px;margin:44px 0 8px}
.cta h2{color:#fff;margin:0 0 10px;font-size:26px}
.cta p{opacity:.92;margin-bottom:20px}

.notice{background:#fff8e6;border:1px solid #f3e2a9;border-radius:10px;
  padding:14px 18px;font-size:14px;color:#7a6518;margin:24px 0}

/* footer */
footer.site{background:#10182e;color:#aab3c8;padding:48px 0 24px;margin-top:40px}
footer.site h4{color:#fff;font-size:15px;margin-bottom:12px}
footer.site a{color:#aab3c8;font-size:14px;display:block;margin:6px 0}
footer.site a:hover{color:#fff}
.fgrid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px}
@media(max-width:760px){.fgrid{grid-template-columns:1fr 1fr}}
.copy{border-top:1px solid #26314f;margin-top:32px;padding-top:18px;
  font-size:13px;color:#7c86a0}