.cos-online{--ink:#16112e;--violet:#2b1b5a;--violet2:#4a2fa8;--coral:#ff5a5f;--coral-d:#e3444a;--coraltext:#c9353b;--muted:#54506a;--paper:#ffffff;--soft:#f5f3fb;--line:#e6e2f2;--onDark:#efeaff;--onDarkMuted:#c7bff0;width:100%;max-width:none;overflow-x:clip;box-sizing:border-box;background:var(--paper);color:var(--ink);font-family:var(--ab-font);font-size:17px;line-height:1.6}
.cos-online *,.cos-online *::before,.cos-online *::after{box-sizing:border-box}
.cos-online .wrap{max-width:1140px;margin:0 auto;padding:0 20px}
.cos-online section{padding:88px 0}
.cos-online h1,.cos-online h2,.cos-online h3{font-family:inherit;line-height:1.12;margin:0 0 14px;letter-spacing:-.025em;color:var(--ink)}
.cos-online h1{font-size:clamp(2.2rem,5.6vw,3.8rem);font-weight:800}
.cos-online h2{font-size:clamp(1.7rem,3.4vw,2.4rem);font-weight:800}
.cos-online h3{font-size:1.12rem;font-weight:700}
.cos-online p{margin:0 0 14px}
.cos-online a{color:var(--violet2)}
.cos-online .tag{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--coraltext);margin-bottom:12px}
.cos-online .intro{max-width:720px;margin-bottom:40px}
.cos-online .intro p{color:var(--muted);font-size:1.08rem}
.cos-online .btn{display:inline-flex;align-items:center;justify-content:center;padding:15px 26px;border-radius:12px;font-weight:700;font-size:1.02rem;line-height:1.2;text-decoration:none;transition:background .2s ease,transform .2s ease}
.cos-online .btn-primary{background:var(--coral);color:#fff}
.cos-online .btn-primary:hover{background:var(--coral-d);color:#fff;transform:translateY(-1px)}
.cos-online .btn-ghost{border:1px solid rgba(239,234,255,.45);color:#fff}
.cos-online .btn-ghost:hover{background:rgba(255,255,255,.08);color:#fff}
.cos-online .link-arrow{font-weight:700;text-decoration:none;color:var(--violet2)}
.cos-online .link-arrow:hover{text-decoration:underline}
.cos-online .hero{background:radial-gradient(900px 480px at 100% 0%,rgba(255,90,95,.28),transparent 60%),radial-gradient(800px 500px at 0% 100%,rgba(74,47,168,.55),transparent 60%),var(--violet);color:var(--onDark);padding:84px 0 92px}
.cos-online .hero h1{color:#fff}
.cos-online .hero-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center}
.cos-online .lead{font-size:1.2rem;color:var(--onDarkMuted);max-width:600px}
.cos-online .chip{display:inline-flex;gap:8px;align-items:center;border:1px solid rgba(239,234,255,.3);border-radius:999px;padding:6px 14px;font-size:.85rem;font-weight:600;margin-bottom:22px;color:var(--onDark)}
.cos-online .btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.cos-online .flow{background:rgba(255,255,255,.06);border:1px solid rgba(239,234,255,.18);border-radius:18px;padding:22px}
.cos-online .node{display:flex;align-items:center;gap:12px;background:#fff;color:var(--ink);border-radius:12px;padding:12px 14px;font-weight:600;font-size:.92rem;box-shadow:0 10px 24px -14px rgba(0,0,0,.5)}
.cos-online .node small{display:block;font-weight:500;color:var(--muted);font-size:.78rem}
.cos-online .node i{flex:0 0 auto;width:30px;height:30px;border-radius:8px;display:grid;place-items:center;color:#fff;font-style:normal;font-size:.8rem;font-weight:800}
.cos-online .node .n1{background:#4a2fa8}
.cos-online .node .n2{background:#ff5a5f}
.cos-online .node .n3{background:#7c6bd6}
.cos-online .node .n4{background:#16a34a}
.cos-online .node .n5{background:#0ea5e9}
.cos-online .edge{width:2px;height:20px;background:rgba(239,234,255,.45);margin:0 0 0 28px}
.cos-online .split{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.cos-online .pain{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.cos-online .pain div{background:var(--soft);border-radius:16px;padding:24px}
.cos-online .pain p{color:var(--muted);margin:0}
.cos-online .channels{display:flex;flex-wrap:wrap;gap:10px}
.cos-online .channels span{border:1px solid var(--line);background:#fff;border-radius:999px;padding:9px 16px;font-weight:600;font-size:.95rem}
.cos-online .feat{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}
.cos-online .card{border:1px solid var(--line);border-radius:16px;padding:26px;background:#fff;box-shadow:0 1px 2px rgba(43,27,90,.05),0 14px 34px -24px rgba(43,27,90,.3)}
.cos-online .card p{color:var(--muted);margin:0}
.cos-online .ico{width:44px;height:44px;border-radius:12px;background:var(--soft);color:var(--violet2);display:grid;place-items:center;margin-bottom:16px}
.cos-online .bg-soft{background:var(--soft)}
.cos-online .plays{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.cos-online .play{background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px;border-left:5px solid var(--coral)}
.cos-online .play ol{margin:8px 0 0;padding-left:20px;color:var(--muted)}
.cos-online .play li{margin:4px 0}
.cos-online .open{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.cos-online .open > div p{color:var(--muted)}
.cos-online .open ul{list-style:none;margin:0;padding:0}
.cos-online .open li{padding:12px 0 12px 32px;border-bottom:1px solid var(--line);position:relative;color:var(--muted)}
.cos-online .open li strong{color:var(--ink)}
.cos-online .open li::before{content:"";position:absolute;left:0;top:16px;width:18px;height:18px;border-radius:50%;background:var(--coral);-webkit-mask:radial-gradient(circle,transparent 0 3px,#000 4px);mask:radial-gradient(circle,transparent 0 3px,#000 4px)}
.cos-online .topics{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.cos-online .topic{display:block;text-decoration:none;background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;color:var(--ink);transition:border-color .2s ease,transform .2s ease}
.cos-online .topic:hover{border-color:var(--violet2);transform:translateY(-2px)}
.cos-online .topic b{display:block;font-size:1.06rem;color:var(--ink);margin-bottom:6px}
.cos-online .topic span{display:block;font-size:.93rem;color:var(--muted);line-height:1.55}
.cos-online .blog-cta{margin-top:30px;text-align:center}
.cos-online .faq-list{max-width:820px}
.cos-online .faq details{border:1px solid var(--line);border-radius:14px;padding:0 22px;margin-bottom:12px;background:#fff}
.cos-online .faq summary{cursor:pointer;font-weight:700;padding:18px 0}
.cos-online .faq details p{color:var(--muted);margin:0 0 18px}
.cos-online .cta{background:radial-gradient(800px 360px at 100% 0%,rgba(255,90,95,.28),transparent 60%),linear-gradient(135deg,var(--violet),#120c2a);color:var(--onDark);text-align:center}
.cos-online .cta h2{color:#fff}
.cos-online .cta p{color:var(--onDarkMuted);max-width:600px;margin:0 auto 6px}
.cos-online .cta .btns{justify-content:center}
@media (max-width:900px){.cos-online .hero-grid,.cos-online .open{grid-template-columns:1fr;gap:40px}.cos-online .feat,.cos-online .pain,.cos-online .topics{grid-template-columns:1fr 1fr}}
@media (max-width:620px){.cos-online{font-size:16px}.cos-online .wrap{padding:0 16px}.cos-online section{padding:60px 0}.cos-online .hero{padding:52px 0 60px}.cos-online .lead{font-size:1.1rem}.cos-online .feat,.cos-online .pain,.cos-online .plays,.cos-online .split,.cos-online .topics{grid-template-columns:1fr}.cos-online .btn{width:100%}.cos-online .intro{margin-bottom:28px}}