/* 分栏功能说明书风 · 左目录右内容 */
:root{
  --bg:#f5f7fa;--card:#fff;--ink:#1a2332;--muted:#5f6b7a;--line:#e2e7ee;
  --brand:#e6252d;--brand-d:#c81c26;--navy:#1e3a5f;--toc:#0f1724;--code:#eef2f7;
  --max:1180px;--r:10px;
  --mono:"Cascadia Mono","Consolas","SF Mono",monospace;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.65}
a{color:inherit;text-decoration:none}img{max-width:100%;display:block}button{font:inherit}
.wrap{width:min(100% - 32px,var(--max));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:none;border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-family:var(--mono);font-size:14px}
.logo-mark{width:34px;height:34px;border-radius:6px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:12px;font-family:var(--mono)}
.nav-links{display:flex;align-items:center;gap:6px;flex-wrap:wrap;font-size:13px}
.nav-links a{padding:7px 12px;border-radius:6px;color:var(--muted)}
.nav-links a:hover{background:var(--code);color:var(--ink)}
.nav-links a.t-active{background:#ffe8ea;color:var(--brand);font-weight:700}
.nav-cta{background:var(--brand)!important;color:#fff!important;font-weight:700}
.nav-sep{width:1px;height:14px;background:var(--line);margin:0 4px}
.hero{position:relative;overflow:hidden;color:#fff;background:
  radial-gradient(ellipse 50% 60% at 88% 30%,rgba(230,37,45,.42) 0%,transparent 55%),
  radial-gradient(ellipse 80% 70% at 15% 35%,#0a2848 0%,transparent 55%),
  linear-gradient(165deg,#060a12 0%,#0c1828 42%,#0a121c 100%)}
.skyline{position:absolute;inset:auto 0 0 0;height:160px;opacity:.22;pointer-events:none;z-index:1}
.hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:center;padding:60px 0 72px}
.kicker{display:inline-flex;align-items:center;gap:8px;padding:5px 10px;border-radius:4px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);font-size:11px;color:#9eb4cc;margin-bottom:14px;font-family:var(--mono);letter-spacing:.06em}
.kicker i{width:6px;height:6px;background:#5ad0ff}
.hero h1{margin:0 0 12px;font-size:clamp(24px,3.6vw,40px);line-height:1.15;font-weight:800}
.hero-lead{margin:0 0 16px;color:#c5d0dc;font-size:14px;max-width:50ch}
.latency{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.latency span{padding:6px 10px;border-radius:4px;background:rgba(90,208,255,.08);border:1px solid rgba(90,208,255,.25);font-size:11px;color:#9fe0ff;font-family:var(--mono)}
.platform-pills{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.platform-pills button{border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.06);color:#eef3fa;padding:8px 14px;border-radius:6px;cursor:pointer;font-family:var(--mono);font-size:12px}
.platform-pills button.is-on{background:#fff;color:#121a24;font-weight:700;border-color:#fff}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:16px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 18px;border-radius:6px;font-weight:700;border:1px solid transparent;cursor:pointer;font-size:13px}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 0 24px rgba(230,37,45,.35)}
.btn-primary:hover{background:var(--brand-d)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.3)}
.btn-ghost:hover{background:rgba(255,255,255,.08)}
.btn-line{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-line:hover{border-color:var(--brand);color:var(--brand)}
.btn-sm{padding:8px 12px;font-size:12px}
.meta-row{display:flex;flex-wrap:wrap;gap:10px 16px;font-size:11px;color:#8b98a8;margin-bottom:12px;font-family:var(--mono)}
.update-list{margin:0;padding-left:18px;color:#a8b4c0;font-size:13px}
.update-list li{margin:3px 0}
.mock-wrap{position:relative;perspective:1000px}
.mock{background:linear-gradient(180deg,#1a2430,#0e1620);border:1px solid rgba(255,255,255,.12);border-radius:12px;padding:12px;box-shadow:0 30px 60px rgba(0,0,0,.45);transform:rotateY(-5deg) rotateX(2deg)}
.mock-bar{height:10px;display:flex;gap:5px;margin-bottom:8px}
.mock-bar span{width:8px;height:8px;border-radius:2px;background:#3a4a58}
.mock-screen{display:grid;grid-template-columns:1.3fr .9fr;gap:6px;background:#080c12;border-radius:8px;overflow:hidden;min-height:250px}
.mock-chart{padding:8px;position:relative}
.mock-chart img{width:100%;height:150px;object-fit:cover;border-radius:6px;opacity:.92}
.chart-line{position:absolute;left:12px;right:12px;top:48%;height:2px;background:linear-gradient(90deg,transparent,#5ad0ff,transparent);opacity:.55}
.mock-side{border-left:1px solid rgba(255,255,255,.06);padding:8px;font-size:10px;font-family:var(--mono)}
.mock-side h4{margin:0 0 6px;color:#5ad0ff;font-size:10px;letter-spacing:.08em}
.stk{display:flex;justify-content:space-between;padding:4px 0;border-bottom:1px solid rgba(255,255,255,.05);color:#e6edf5}
.stk em{font-style:normal;color:#f8a9a0}
.badge-adfree{position:absolute;top:-8px;right:-6px;background:var(--brand);color:#fff;font-size:11px;font-weight:800;padding:9px 12px;transform:rotate(12deg);border-radius:6px;z-index:2;font-family:var(--mono)}
.section{padding:56px 0}
.section-head{margin-bottom:24px}
.section-head h2{margin:0 0 8px;font-size:clamp(20px,2.6vw,28px)}
.section-head p{margin:0;max-width:64ch;color:var(--muted);font-size:14px}
.docs{display:grid;grid-template-columns:220px 1fr;gap:20px;align-items:start;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:0 8px 24px rgba(15,23,36,.05)}
.docs-toc{background:var(--toc);color:#c5d0dc;padding:18px 14px;min-height:100%;position:sticky;top:72px}
.docs-toc h3{margin:0 0 12px;font-size:12px;letter-spacing:.1em;color:#8b98a8;font-family:var(--mono)}
.docs-toc a{display:block;padding:8px 10px;border-radius:6px;font-size:13px;color:#aeb8c6;margin-bottom:4px}
.docs-toc a:hover,.docs-toc a.is-on{background:rgba(255,255,255,.06);color:#fff}
.docs-toc a small{display:block;font-size:10px;color:#6a7688;font-family:var(--mono);margin-top:2px}
.docs-body{padding:24px}
.doc-block{margin-bottom:28px;padding-bottom:24px;border-bottom:1px solid var(--line)}
.doc-block:last-child{border-bottom:0;margin-bottom:0;padding-bottom:0}
.doc-block h3{margin:0 0 8px;font-size:18px}
.doc-block .code{display:inline-block;margin-bottom:8px;padding:2px 8px;background:var(--code);border-radius:4px;font-family:var(--mono);font-size:11px;color:var(--navy)}
.doc-block p{margin:0 0 10px;color:var(--muted);font-size:14px}
.doc-block ul{margin:0;padding-left:18px;color:var(--muted);font-size:13px}
.doc-block li{margin:3px 0}
.platforms{display:grid;gap:14px}
.plat-pc{position:relative;overflow:hidden;display:grid;grid-template-columns:auto 1fr auto;gap:18px;align-items:center;background:linear-gradient(120deg,#fff 0%,#fff0f2 100%);border:1px solid #f0d2db;border-radius:var(--r);padding:24px;box-shadow:0 12px 28px rgba(230,37,45,.08)}
.ribbon{position:absolute;top:16px;left:-30px;background:var(--brand);color:#fff;font-size:11px;font-weight:800;padding:5px 38px;transform:rotate(-45deg);font-family:var(--mono)}
.plat-ico{width:54px;height:54px;border-radius:10px;background:var(--brand);display:grid;place-items:center;font-size:20px;color:#fff;font-family:var(--mono);font-weight:800}
.plat-pc h3{margin:0 0 4px;font-size:18px}
.plat-pc p{margin:0;color:var(--muted);font-size:13px}
.plat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.plat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;text-align:center}
.plat-card h3{margin:0 0 6px;font-size:14px}
.plat-card p{margin:0 0 10px;color:var(--muted);font-size:12px}
.feat{display:grid;gap:20px}
.feat-row{display:grid;grid-template-columns:1fr 1fr;gap:0;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.feat-row.reverse .feat-media{order:2}
.feat-media img{width:100%;height:240px;object-fit:cover}
.feat-body{padding:24px}
.feat-body .pill{display:inline-block;margin-bottom:8px;padding:3px 8px;border-radius:4px;background:var(--code);color:var(--navy);font-size:11px;font-family:var(--mono)}
.feat-body h3{margin:0 0 8px;font-size:18px}
.feat-body p{margin:0;color:var(--muted);font-size:14px}
.more-feats{margin-top:20px}
.more-feats summary{cursor:pointer;list-style:none;padding:12px 16px;background:#fff;border:1px solid var(--line);border-radius:6px;font-weight:700;font-size:13px;font-family:var(--mono)}
.more-feats summary::-webkit-details-marker{display:none}
.more-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:10px}
.more-item{background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px}
.more-item h4{margin:0 0 4px;font-size:13px;font-family:var(--mono)}
.more-item p{margin:0;font-size:12px;color:var(--muted)}
.community{padding:64px 0;background:linear-gradient(135deg,#3b1a5c 0%,#7a2e1e 55%,#c45a1a 100%)}
.community .section-head h2,.community .section-head p{color:#fff}
.community .section-head p{opacity:.9}
.phones{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:720px;margin:0 auto}
.phone{background:#0a0e12;border:3px solid #1a2230;border-radius:28px;padding:12px;box-shadow:0 24px 48px rgba(0,0,0,.3);max-width:280px;margin:0 auto;width:100%}
.phone-notch{width:40%;height:8px;background:#1a2230;border-radius:0 0 8px 8px;margin:0 auto 10px}
.feed{background:#121820;border-radius:18px;padding:12px;min-height:300px}
.feed-item{padding:10px 0;border-bottom:1px solid #1e2834}
.feed-item:last-child{border:0}
.feed-item strong{display:block;font-size:13px;margin-bottom:4px;color:#fff}
.feed-item span{font-size:12px;color:#a8b4c0}
.site-footer{background:#0f1724;color:#c5d0dc;padding:48px 0 24px}
.qr-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:28px}
.qr-box{text-align:center}
.qr-fake{width:80px;height:80px;margin:0 auto 6px;background:
  repeating-linear-gradient(0deg,#1a2838 0 4px,transparent 4px 8px),
  repeating-linear-gradient(90deg,#1a2838 0 4px,transparent 4px 8px),#0a1420;border:1px solid #2a3a4a;border-radius:6px}
.qr-box span{font-size:12px;color:#8a98a8}
.foot-links{display:flex;flex-wrap:wrap;gap:10px 16px;margin-bottom:14px;font-size:13px;font-family:var(--mono)}
.foot-links a:hover{color:#5ad0ff}
.foot-contact{font-size:12px;color:#8a98a8;margin-bottom:12px}
.foot-copy{font-size:11px;color:#5a6878;border-top:1px solid #1a2838;padding-top:12px;font-family:var(--mono)}
.page-hero{padding:40px 0 14px;background:linear-gradient(180deg,#eef2f7,#f5f7fa)}
.page-hero h1{margin:0 0 8px;font-size:clamp(22px,2.8vw,30px)}
.page-hero p{margin:0;color:var(--muted);max-width:60ch;font-size:14px}
.crumbs{font-size:12px;color:var(--muted);margin-bottom:10px;font-family:var(--mono)}
.crumbs a{color:var(--brand)}
.card-list{display:grid;gap:10px}
.dl-card,.faq-item{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px}
.dl-card{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center}
.dl-card h2,.faq-item h2{margin:0 0 6px;font-size:15px}
.dl-card p,.faq-item p{margin:0;color:var(--muted);font-size:13px}
@media (max-width:900px){
  .hero-grid,.feat-row,.feat-row.reverse .feat-media,.plat-pc,.phones,.plat-grid,.more-grid,.qr-grid,.dl-card,.docs{grid-template-columns:1fr}
  .docs-toc{position:static}
  .feat-row.reverse .feat-media{order:0}
  .plat-pc{justify-items:start}
  .hide-sm{display:none!important}
}

/* perf */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}
.site-header{backdrop-filter:none!important;-webkit-backdrop-filter:none!important}
.feat-media img,.mock-chart img,.feat-row img{content-visibility:auto}
.community,.site-footer{content-visibility:auto;contain-intrinsic-size:800px}
img{height:auto}