:root{
  --bg:#0b1220; --bg2:#0f1a30; --panel:#111a2e; --ink:#0f172a; --muted:#64748b;
  --line:#e2e8f0; --soft:#f5f7fb; --brand:#2563eb; --brand2:#38bdf8;
  --green:#16a34a; --amber:#d97706; --red:#dc2626;
  --radius:16px; --shadow:0 18px 50px rgba(15,23,42,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:#fff;line-height:1.65}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.muted{color:var(--muted)}
.small{font-size:13px}
.tiny{font-size:12px}
.center{text-align:center}
.mt8{margin-top:8px}.mt16{margin-top:16px}.mt24{margin-top:24px}.mt40{margin-top:40px}
.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)}
@media(max-width:980px){.g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:1fr}.g2{grid-template-columns:1fr}}
@media(max-width:640px){.g4{grid-template-columns:1fr}.wrap{padding:0 18px}}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:26px;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:#0b1220}
.brand img{height:36px;width:auto}
.brand .txt{display:flex;flex-direction:column;line-height:1.15}
.brand .txt b{font-size:14.5px;letter-spacing:.2px}
.brand .txt span{font-size:10.5px;color:var(--muted);font-weight:500}
.nav{display:flex;gap:22px;margin-left:8px;font-size:14px;color:#334155}
.nav a{position:relative;padding:6px 0}
.nav a:hover{color:var(--brand)}
.header-cta{margin-left:auto;display:flex;gap:10px;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:10px;padding:10px 18px;font-size:14px;font-weight:700;border:1px solid transparent;cursor:pointer;transition:.18s;white-space:nowrap}
.btn.primary{background:var(--brand);color:#fff;box-shadow:0 8px 20px rgba(37,99,235,.28)}
.btn.primary:hover{background:#1d4ed8;transform:translateY(-1px)}
.btn.ghost{background:#fff;color:#0f172a;border-color:var(--line)}
.btn.ghost:hover{border-color:#cbd5e1;background:#f8fafc}
.btn.dark{background:#0b1220;color:#fff}
.btn.small{padding:7px 13px;font-size:12.5px;border-radius:8px}
@media(max-width:900px){.nav{display:none}.site-header .wrap{gap:12px}}

/* hero */
.hero{background:radial-gradient(1200px 500px at 80% -10%,rgba(37,99,235,.35),transparent 60%),linear-gradient(180deg,#0b1220 0%,#0f1a30 60%,#0b1220 100%);color:#fff;padding:76px 0 86px;position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);background-size:56px 56px;mask-image:linear-gradient(180deg,#000 20%,transparent 90%)}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center}
@media(max-width:980px){.hero .wrap{grid-template-columns:1fr}}
.kicker{font-size:12px;letter-spacing:3px;color:#93c5fd;font-weight:800}
.hero h1{font-size:46px;line-height:1.18;margin:14px 0 16px;letter-spacing:-.5px;max-width:760px}
.hero p.lead{font-size:16.5px;color:#cbd5e1;max-width:640px;margin:0 0 26px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.hero .note{margin-top:18px;font-size:12.5px;color:#94a3b8}
.hero-card{background:rgba(255,255,255,.06);border:1px solid rgba(148,163,184,.25);border-radius:20px;padding:14px;backdrop-filter:blur(8px);box-shadow:0 30px 80px rgba(0,0,0,.35)}
.hero-card img{border-radius:12px;border:1px solid rgba(255,255,255,.12)}
.hero-card .cap{font-size:12px;color:#94a3b8;padding:10px 6px 2px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:46px;position:relative}
.stat{background:rgba(255,255,255,.055);border:1px solid rgba(148,163,184,.22);border-radius:14px;padding:16px 18px}
.stat .v{font-size:26px;font-weight:800;color:#fff;line-height:1.2}
.stat .l{font-size:12px;color:#94a3b8;margin-top:4px}
@media(max-width:760px){.hero h1{font-size:36px}.stats{grid-template-columns:repeat(2,1fr)}}

/* section */
.section{padding:78px 0}
.section.alt{background:var(--soft)}
.section-head{max-width:760px;margin-bottom:36px}
.section-head .k{font-size:12px;letter-spacing:2px;color:var(--brand);font-weight:800}
.section-head h2{font-size:32px;margin:8px 0 10px;letter-spacing:-.3px}
.section-head p{color:var(--muted);margin:0;font-size:15px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:0 2px 10px rgba(15,23,42,.03)}
.feature .ico{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,#dbeafe,#eff6ff);color:var(--brand);display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:800;margin-bottom:14px}
.feature h3{margin:0 0 8px;font-size:16.5px}
.feature p{margin:0;color:var(--muted);font-size:13.5px}
.how{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.how .step{position:relative;padding-top:18px}
.how .n{font-size:13px;font-weight:800;color:var(--brand)}
.how h3{margin:6px 0 6px;font-size:16px}
.how p{margin:0;color:var(--muted);font-size:13px}
@media(max-width:900px){.how{grid-template-columns:repeat(2,1fr)}}
.shot{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.shot img{width:100%;border-bottom:1px solid var(--line)}
.shot .cap{padding:16px 18px}
.shot .cap b{font-size:14.5px}
.shot .cap p{margin:4px 0 0;color:var(--muted);font-size:12.5px}
.case{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 2px 12px rgba(15,23,42,.04)}
.case .top{padding:22px 22px 0}
.tag{display:inline-block;font-size:11.5px;font-weight:700;color:var(--brand);background:#eff6ff;border-radius:999px;padding:3px 10px}
.case h3{margin:10px 0 6px;font-size:18px}
.case p{margin:0 0 14px;color:var(--muted);font-size:13.5px}
.case .metrics{padding:0 22px 18px;display:flex;gap:8px;flex-wrap:wrap}
.metric{font-size:11.5px;color:#166534;background:#ecfdf3;border-radius:999px;padding:3px 9px}
.price-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;position:relative}
.price-card.featured{border:2px solid var(--brand);box-shadow:0 24px 60px rgba(37,99,235,.16)}
.price-card .name{font-size:15px;font-weight:800}
.price-card .price{font-size:34px;font-weight:800;margin:8px 0 2px;color:#0b1220}
.price-card .unit{color:var(--muted);font-size:12.5px}
.price-card ul{list-style:none;padding:0;margin:16px 0 20px;color:#334155;font-size:13.5px}
.price-card li{padding:5px 0;border-bottom:1px dashed #eef2f7}
.price-card li:last-child{border:0}
.badge-rec{position:absolute;top:-12px;right:18px;background:var(--brand);color:#fff;font-size:11px;font-weight:800;padding:3px 10px;border-radius:999px}
.faq details{border:1px solid var(--line);border-radius:12px;padding:14px 18px;background:#fff;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:700;font-size:14.5px}
.faq p{color:var(--muted);font-size:13.5px;margin:10px 0 0}
.cta-band{background:linear-gradient(135deg,#0b1220,#12224a);color:#fff;border-radius:20px;padding:40px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.cta-band h3{margin:0 0 6px;font-size:24px}
.cta-band p{margin:0;color:#94a3b8;font-size:13.5px}
.footer{background:#0b1220;color:#94a3b8;padding:54px 0 30px;font-size:13px}
.footer a{color:#cbd5e1}
.footer a:hover{color:#fff}
.footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:30px;margin-bottom:36px}
@media(max-width:900px){.footer .cols{grid-template-columns:1fr 1fr}}
.footer h4{color:#fff;font-size:14px;margin:0 0 12px}
.footer ul{list-style:none;padding:0;margin:0}
.footer li{margin:7px 0}
.footer .bottom{border-top:1px solid rgba(148,163,184,.18);padding-top:18px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:12px;color:#64748b}
.download-item{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:16px 0;border-bottom:1px dashed var(--line)}
.download-item:last-child{border:0}
.notice{background:#fff8e6;border:1px solid #fde68a;color:#92400e;border-radius:12px;padding:12px 16px;font-size:13px}

/* public user center */
.auth-wrap{min-height:calc(100vh - 68px);display:flex;align-items:center;justify-content:center;padding:40px 18px;background:linear-gradient(160deg,#f5f7fb,#eef4ff)}
.auth-card{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:30px;width:100%;max-width:420px}
.auth-card h2{margin:0 0 6px;font-size:22px}
.field{margin:14px 0}
.field label{display:block;font-size:12.5px;color:#475569;margin-bottom:6px;font-weight:700}
.input{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 13px;font-size:14px;background:#fff;outline:none}
.input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.msg{border-radius:10px;padding:10px 13px;font-size:13px;margin:10px 0}
.msg.err{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.msg.ok{background:#ecfdf5;color:#166534;border:1px solid #bbf7d0}
.dash-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:800px){.dash-cards{grid-template-columns:1fr}}

/* internal */
.internal-body{background:#f4f6fb;min-height:100vh}
.internal-header{background:#0b1220;color:#fff}
.internal-header .wrap{display:flex;align-items:center;gap:16px;height:62px}
.internal-header .brand{color:#fff}
.internal-header .brand .txt span{color:#94a3b8}
.internal-header .who{margin-left:auto;display:flex;align-items:center;gap:14px;font-size:13px;color:#cbd5e1}
.internal-header .who a{color:#93c5fd}
.internal-layout{display:grid;grid-template-columns:220px 1fr;gap:24px;padding:26px 0 60px}
@media(max-width:900px){.internal-layout{grid-template-columns:1fr}}
.internal-nav{background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px;align-self:start;position:sticky;top:20px}
.internal-nav a{display:block;padding:10px 12px;border-radius:9px;font-size:13.5px;color:#334155;margin:2px 0}
.internal-nav a:hover{background:#f1f5f9}
.internal-nav a.active{background:#eff6ff;color:var(--brand);font-weight:800}
.internal-main{min-width:0}
.internal-main h1{margin:0 0 6px;font-size:26px}
.internal-main .sub{color:var(--muted);font-size:13px;margin-bottom:22px}
.kv{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:22px}
@media(max-width:900px){.kv{grid-template-columns:repeat(2,1fr)}}
.kv .k{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px}
.kv .k .v{font-size:22px;font-weight:800}
.kv .k .l{color:var(--muted);font-size:12px;margin-top:4px}
.internal-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;margin-bottom:18px}
.internal-card h2{margin:0 0 12px;font-size:18px}
.doc-row{display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px dashed var(--line);font-size:13.5px}
.doc-row:last-child{border:0}
.doc-row .t{font-weight:700}
.doc-row .m{color:var(--muted);font-size:12px;margin-top:3px}
.pill{display:inline-block;font-size:11.5px;padding:2px 9px;border-radius:999px;background:#eff6ff;color:var(--brand);font-weight:700}
.pill.green{background:#ecfdf3;color:#166534}.pill.amber{background:#fff7ed;color:#9a3412}.pill.gray{background:#f1f5f9;color:#475569}
.table{width:100%;border-collapse:collapse;font-size:13px}
.table th,.table td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:top}
.table th{color:var(--muted);font-weight:700;font-size:12px}
.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:radial-gradient(900px 420px at 80% -10%,rgba(37,99,235,.4),transparent 60%),#0b1220}
.login-card{width:100%;max-width:420px;background:#fff;border-radius:18px;padding:32px;box-shadow:0 40px 80px rgba(0,0,0,.4)}
.login-card .logo{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.login-card .logo img{height:34px}
.login-card h1{font-size:21px;margin:0 0 6px}
.login-card .hint{color:var(--muted);font-size:12.5px;margin-bottom:18px}
.internal-foot{color:#94a3b8;font-size:12px;text-align:center;padding:20px 0 40px}
.noindex-warn{background:#fef3c7;border:1px solid #fcd34d;color:#92400e;border-radius:10px;padding:10px 14px;font-size:12.5px;margin-bottom:16px}
.faq{border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px;background:#fff}
.faq summary{cursor:pointer;font-weight:600;font-size:14px}
.faq-a{margin-top:10px;color:#475569;font-size:13.5px;line-height:1.8}
.doc-view h1{font-size:24px;margin:0 0 12px}
.doc-view h2{font-size:19px;margin:22px 0 8px;padding-bottom:6px;border-bottom:1px solid var(--line)}
.doc-view h3{font-size:16px;margin:16px 0 6px}
.doc-view h4{font-size:14px;margin:12px 0 4px}
.doc-view p,.doc-view li{font-size:13.5px;color:#334155;line-height:1.8}
.doc-view ul{padding-left:22px}
.doc-view pre{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:14px;overflow:auto;font-size:12.5px}
.doc-view code{background:#f1f5f9;border-radius:5px;padding:1px 5px;font-size:12.5px}
.doc-view pre code{background:none;padding:0;color:inherit}
.video-wrap{max-width:960px;margin:0 auto;text-align:center}
.demo-video{width:100%;display:block;border-radius:16px;border:1px solid var(--line);box-shadow:0 24px 60px rgba(15,23,42,.16);background:#000}
.video-note{margin-top:12px;color:var(--muted);font-size:12.5px}
.progress{height:8px;background:#eef2f7;border-radius:999px;overflow:hidden;margin-top:6px}
.progress i{display:block;height:100%;background:linear-gradient(90deg,#2563eb,#38bdf8);border-radius:999px}