:root{--blue:#2563eb;--navy:#1e3a8a;--pale:#eef4ff;--ink:#0f172a;--muted:#475569;--line:#dbe4f5;--max:1080px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:17px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:#fff}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue)}
code{font:0.9em ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--pale);padding:.1em .35em;border-radius:4px;word-break:break-word}
pre{background:#0f172a;color:#e2e8f0;padding:14px 16px;border-radius:10px;overflow-x:auto;font:14px/1.5 ui-monospace,Menlo,Consolas,monospace}
pre code{background:none;padding:0;color:inherit}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
header.top{position:sticky;top:0;z-index:5;background:rgba(255,255,255,.95);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;gap:14px;min-height:60px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--navy);text-decoration:none}
.brand img{width:34px;height:34px}
nav{display:flex;gap:16px;flex-wrap:wrap;margin-left:auto;font-size:15px}
nav a{color:var(--navy);text-decoration:none}
nav a:hover{text-decoration:underline}
.hero{background:linear-gradient(180deg,var(--pale),#fff);padding:64px 0 40px}
.hero .wrap{display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center}
.hero h1{font-size:clamp(32px,5vw,50px);line-height:1.1;margin:0 0 14px;color:var(--navy)}
.hero p.lead{font-size:20px;color:var(--muted);margin:0 0 24px}
.btn{display:inline-block;background:var(--blue);color:#fff;text-decoration:none;font-weight:600;padding:12px 20px;border-radius:10px;border:0}
.btn:hover{background:var(--navy)}
.btn.ghost{background:#fff;color:var(--navy);border:1px solid var(--line)}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.shot{border:1px solid var(--line);border-radius:12px;box-shadow:0 10px 30px rgba(30,58,138,.12);background:#fff;overflow:hidden}
figure{margin:0}
figcaption{font-size:14px;color:var(--muted);margin-top:8px}
section{padding:56px 0;border-top:1px solid var(--line)}
section.alt{background:var(--pale)}
h2{font-size:30px;color:var(--navy);margin:0 0 16px;line-height:1.2}
h3{font-size:20px;margin:0 0 6px;color:var(--ink)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px}
.card p{margin:0;color:var(--muted)}
.feature{display:grid;grid-template-columns:1fr 1.2fr;gap:32px;align-items:center;margin:36px 0}
.feature:nth-child(even) .ftext{order:2}
.feature p{color:var(--muted)}
ol.steps li{margin:0 0 10px}
.note{border-left:4px solid var(--blue);background:var(--pale);padding:12px 16px;border-radius:0 8px 8px 0}
.dl{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;margin:20px 0}
.sha{font:13px ui-monospace,Menlo,Consolas,monospace;word-break:break-all;color:var(--muted)}
details{border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:10px 0;background:#fff}
summary{cursor:pointer;font-weight:600}
footer{background:var(--navy);color:#dbe4ff;padding:36px 0;font-size:15px}
footer a{color:#fff}
footer .wrap{display:flex;gap:24px;flex-wrap:wrap;justify-content:space-between}
.paper h2{margin-top:40px;font-size:26px}
.paper main{max-width:780px;margin:0 auto;padding:40px 20px}
.paper table{border-collapse:collapse;width:100%;font-size:15px}
.paper td,.paper th{border:1px solid var(--line);padding:8px;text-align:left;vertical-align:top}
.herologo{display:flex;justify-content:center}
.heroshot img{width:100%}
.herologo img{width:260px;filter:drop-shadow(0 18px 30px rgba(30,58,138,.22))}
@media (max-width:820px){
 .herologo{display:none}
 .hero{padding:36px 0 24px}
 .hero .wrap,.feature{grid-template-columns:1fr;gap:20px}
 .feature:nth-child(even) .ftext{order:0}
 nav{margin-left:0;gap:12px;font-size:14px}
 section{padding:40px 0}
}