:root{--c:#1f4fd1;--c2:#163aa0;--ink:#111827;--mut:#4b5563;--line:#e5e7eb;--bg:#f7f8fb;--ok:#0f766e;--r:14px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",Arial,sans-serif;color:var(--ink);line-height:1.65;background:#fff;font-size:16px}
a{color:var(--c);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.narrow{max-width:820px}
/* language bar */
.langbar{display:none;background:#eef2ff;border-bottom:1px solid #dbe3ff;font-size:14px}
.langbar.show{display:block}
.langbar .wrap{display:flex;gap:12px;align-items:center;justify-content:center;padding:8px 20px;flex-wrap:wrap}
.langbar button{font:inherit;border:1px solid #c7d2fe;background:#fff;border-radius:8px;padding:2px 10px;cursor:pointer}
.langbar a.btn-s{border:1px solid var(--c);background:var(--c);color:#fff;border-radius:8px;padding:2px 10px}
/* header */
header.top{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:saturate(1.4) blur(6px)}
header.top .wrap{display:flex;align-items:center;gap:20px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand img{width:30px;height:30px}
.brand small{font-weight:500;color:var(--mut);font-size:14px}
nav.main{display:flex;gap:18px;flex:1}
nav.main a{color:var(--ink);font-size:15px}
nav.main a.on{color:var(--c);font-weight:600}
.acts{display:flex;gap:12px;align-items:center;font-size:15px}
.acts .lang{color:var(--mut)}
.btn{display:inline-block;border-radius:10px;padding:10px 18px;font-weight:600;border:1px solid var(--c);background:var(--c);color:#fff;line-height:1.3;text-align:center}
.btn:hover{background:var(--c2);text-decoration:none}
.btn.ghost{background:#fff;color:var(--c)}
.btn.ghost:hover{background:#eef2ff}
.btn.sm{padding:7px 14px;font-size:14px}
.btn.lg{padding:13px 24px;font-size:17px}
/* sections */
.hero{padding:72px 0 56px;background:linear-gradient(180deg,#f3f6ff 0%,#fff 100%)}
.hero h1{font-size:44px;line-height:1.2;margin:0 0 16px;letter-spacing:-.01em}
.hero p.sub{font-size:19px;color:var(--mut);max-width:760px;margin:0 0 26px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap}
.hero .note{font-size:14px;color:var(--mut);margin-top:14px}
.pagehead{padding:56px 0 28px;background:linear-gradient(180deg,#f3f6ff 0%,#fff 100%)}
.pagehead h1{font-size:36px;line-height:1.25;margin:0 0 12px}
.pagehead p.sub{font-size:18px;color:var(--mut);margin:0 0 20px;max-width:780px}
.meta{font-size:14px;color:var(--mut)}
section.s{padding:48px 0}
section.alt{background:var(--bg)}
h2{font-size:28px;line-height:1.3;margin:0 0 20px}
h3{font-size:19px;margin:0 0 8px}
.lead{color:var(--mut);margin-top:-8px;margin-bottom:24px}
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.g5{grid-template-columns:repeat(5,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px}
.card p{margin:0 0 10px;color:var(--mut)}
.card .more{font-weight:600}
.step{counter-increment:st}
.steps{counter-reset:st}
.step h3:before{content:counter(st);display:inline-flex;width:28px;height:28px;border-radius:50%;background:var(--c);color:#fff;font-size:15px;align-items:center;justify-content:center;margin-right:10px}
.price{position:relative}
.price .amt{font-size:30px;font-weight:700;margin:6px 0 2px;color:var(--ink)}
.price .per{font-size:14px;color:var(--mut)}
.price ul{padding-left:18px;margin:12px 0 16px;color:var(--mut);font-size:15px}
.price.main{border:2px solid var(--c)}
.tag{display:inline-block;background:#eef2ff;color:var(--c);border-radius:999px;padding:1px 10px;font-size:13px;font-weight:600}
table.t{width:100%;border-collapse:collapse;background:#fff;font-size:15px}
table.t th,table.t td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
table.t th{background:#f3f4f6;font-weight:600}
.tw{overflow-x:auto}
.box{border-left:4px solid var(--c);background:#f5f7ff;padding:14px 18px;border-radius:8px;color:#1f2937}
.box.mut{border-color:#9ca3af;background:#f9fafb;color:var(--mut);font-size:15px}
details.q{border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:0 0 12px;background:#fff}
details.q summary{cursor:pointer;font-weight:600;list-style:none}
details.q summary::-webkit-details-marker{display:none}
details.q summary:after{content:"+";float:right;color:var(--mut)}
details.q[open] summary:after{content:"–"}
details.q p{margin:10px 0 0;color:var(--mut)}
pre{background:#0f172a;color:#e5e7eb;padding:14px 16px;border-radius:10px;overflow-x:auto;font-size:14px;line-height:1.5}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92em}
p code,li code,td code{background:#f3f4f6;padding:1px 5px;border-radius:5px}
.doc h2{margin-top:36px;font-size:24px}
.doc h3{margin-top:24px}
.doc ul,.doc ol{padding-left:22px}
.doc li{margin:4px 0}
.ctabar{background:var(--c);color:#fff;padding:40px 0;text-align:center}
.ctabar p{font-size:20px;margin:0 0 16px}
.ctabar .btn{background:#fff;color:var(--c);border-color:#fff}
.ctabar .btn:hover{background:#eef2ff}
form.f{display:grid;gap:14px;max-width:620px}
form.f label{font-weight:600;font-size:15px;display:grid;gap:6px}
form.f input[type=text],form.f input[type=email],form.f select,form.f textarea{font:inherit;padding:10px 12px;border:1px solid #cbd5e1;border-radius:10px;width:100%;font-weight:400}
form.f .chk{display:flex;gap:8px;align-items:flex-start;font-weight:400}
form.f .err{color:#b91c1c;font-size:14px;min-height:1em}
.hide{display:none}
/* footer */
footer.ft{background:#0f172a;color:#cbd5e1;padding:44px 0 28px;font-size:14px;margin-top:0}
footer.ft a{color:#e2e8f0}
footer.ft .cols{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:24px}
footer.ft h4{color:#fff;margin:0 0 10px;font-size:15px}
footer.ft ul{list-style:none;padding:0;margin:0}
footer.ft li{margin:6px 0}
footer.ft .disc{border-top:1px solid #1e293b;margin-top:28px;padding-top:18px;color:#94a3b8;line-height:1.6}
@media (max-width:900px){
  nav.main{display:none}
  .g3,.g4,.g5{grid-template-columns:1fr 1fr}
  footer.ft .cols{grid-template-columns:1fr 1fr}
  .hero h1{font-size:34px}
}
@media (max-width:600px){
  .g2,.g3,.g4,.g5{grid-template-columns:1fr}
  .acts .login{display:none}
  .hero{padding:48px 0 36px}
  .hero h1{font-size:30px}
  .pagehead h1{font-size:28px}
  h2{font-size:23px}
}
.mt{margin-top:32px}