:root{--bg:#000;--s1:#0c0d0f;--s2:#131417;--tx:#F4F5F6;--tx-dim:#9aa0a8;--tx-mute:#62666d;--accent:#2B52BC;--accent-hi:#3A63D4;--container:760px;--r:10px;--r-sm:8px;--ease:cubic-bezier(.22,.61,.36,1)}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--tx);font-family:"Geist",-apple-system,BlinkMacSystemFont,system-ui,sans-serif;font-size:16.5px;line-height:1.65;letter-spacing:-.011em;-webkit-font-smoothing:antialiased}
::selection{background:var(--accent);color:#fff}
a{color:inherit;text-decoration:none}
.container{max-width:var(--container);margin:0 auto;padding:0 28px}
.nav{position:sticky;top:0;z-index:10;padding:18px 0;background:rgba(8,8,10,.72);backdrop-filter:blur(14px) saturate(140%)}
.nav-inner{display:flex;align-items:center;height:40px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:-.02em;font-size:16px}
.brand .mark{width:28px;height:28px;border-radius:7px;flex:none;background:var(--s2);display:grid;place-items:center;overflow:hidden}
.brand .mark img{width:20px;height:auto;display:block}
.back{margin-left:auto;font-size:14.5px;color:var(--tx-dim);transition:color .15s var(--ease)}
.back:hover{color:var(--tx)}
header.page{padding:64px 0 8px}
header.page h1{font-size:clamp(32px,4.5vw,44px);font-weight:700;letter-spacing:-.03em;line-height:1.08}
.meta{color:var(--tx-dim);font-size:13.5px;margin-top:15px}
.meta a{text-decoration:underline;text-decoration-color:rgba(255,255,255,.28);text-underline-offset:3px}
.meta a:hover{color:var(--tx);text-decoration-color:rgba(255,255,255,.7)}
main{padding:26px 0 28px}
main h2{font-size:22px;font-weight:600;letter-spacing:-.02em;line-height:1.2;margin:40px 0 12px}
main h3{font-size:17px;font-weight:600;letter-spacing:-.01em;margin:24px 0 8px}
main p{color:var(--tx-dim);margin:0 0 14px}
main ul{list-style:none;display:flex;flex-direction:column;gap:10px;margin:0 0 16px;padding:0}
main li{color:var(--tx-dim);position:relative;padding-left:18px}
main li::before{content:"";position:absolute;left:2px;top:11px;width:5px;height:5px;border-radius:50%;background:var(--accent)}
main strong{color:var(--tx);font-weight:600}
main a{color:var(--tx);text-decoration:underline;text-decoration-color:rgba(255,255,255,.34);text-underline-offset:3px}
main a:hover{text-decoration-color:rgba(255,255,255,.7)}
.lead{color:var(--tx-dim);font-size:18px;margin-bottom:8px}
code{font-family:"Geist Mono","Geist",monospace;font-size:.92em;background:var(--s2);padding:.08em .36em;border-radius:5px;color:var(--tx)}
pre{background:var(--s1);border:1px solid rgba(255,255,255,.08);border-radius:var(--r);padding:16px 18px;overflow-x:auto;margin:0 0 16px}
pre code{background:none;padding:0;font-size:13.5px;line-height:1.7;color:var(--tx-dim)}
.cta-card{background:var(--s1);border:1px solid var(--accent);border-radius:14px;padding:22px 24px;margin:26px 0 6px;display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.cta-card p{margin:0;flex:1 1 260px;color:var(--tx-dim)}
.cta-card strong{color:var(--tx)}
.btn{display:inline-flex;align-items:center;height:44px;padding:0 20px;border-radius:var(--r-sm);font-size:15px;font-weight:700;background:var(--accent);color:#fff;flex:none;text-decoration:none;transition:background .18s var(--ease),transform .18s var(--ease)}
.btn:hover{background:var(--accent-hi)}
.btn:active{transform:translateY(1px)}
.fine{color:var(--tx-mute);font-size:13.5px;margin-top:26px}
.demo{margin:26px 0 8px}
.demo video{display:block;width:100%;height:auto;border-radius:14px;background:var(--s1)}
.demo figcaption{color:var(--tx-dim);font-size:13.5px;margin-top:10px}
.guide-list{display:flex;flex-direction:column;gap:14px;margin-top:28px}
.guide-link{display:block;background:var(--s1);border-radius:14px;padding:22px 24px;text-decoration:none;transition:background .18s var(--ease),transform .18s var(--ease)}
.guide-link:hover{background:var(--s2);transform:translateY(-1px)}
.guide-link h2{margin:0 0 7px;font-size:21px;color:var(--tx)}
.guide-link p{margin:0;color:var(--tx-dim)}
.guide-link.primary{background:#10193a}
.guide-link.primary:hover{background:#152451}
footer{padding:24px 0 48px;text-align:center;color:var(--tx-mute);font-size:13px}
.footer-links{display:flex;justify-content:center;gap:18px;margin-bottom:8px}
.footer-links a{color:var(--tx-dim);transition:color .15s var(--ease)}
.footer-links a:hover{color:var(--tx)}
@media(max-width:560px){header.page{padding:44px 0 4px}.container{padding:0 22px}.nav{padding:14px 0}.back{font-size:14px}.guide-link{padding:20px}.demo video{border-radius:10px}}