:root{
  --blue:#007AFF; --purple:#9b5cff; --ink:#0f1220; --body:#31384a;
  --muted:#5b6472; --line:#e6e8ef; --bg:#f5f6fa; --soft:#f0f3fb;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--body);background:var(--bg);line-height:1.65;-webkit-print-color-adjust:exact;print-color-adjust:exact}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.grad{background:linear-gradient(90deg,var(--blue),var(--purple));-webkit-background-clip:text;background-clip:text;color:transparent}
.topbar{background:#0A0A0A;color:#fff}
.topbar .in{max-width:860px;margin:0 auto;padding:16px 28px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:17px;letter-spacing:-.3px;color:#fff}
.brand .mk{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--blue),var(--purple));display:flex;align-items:center;justify-content:center;font-weight:800}
.topbar nav a{color:#c9cfda;font-size:13px;margin-left:18px}
.topbar nav a:hover{color:#fff;text-decoration:none}
.wrap{max-width:860px;margin:0 auto;background:#fff;padding:46px 56px 60px;min-height:60vh}
.doc-head{border-bottom:3px solid transparent;border-image:linear-gradient(90deg,var(--blue),var(--purple)) 1;padding-bottom:20px;margin-bottom:8px}
h1{font-size:30px;margin:0;letter-spacing:-.6px;color:var(--ink)}
.eff{color:var(--muted);font-size:13px;margin-top:8px}
h2{font-size:19px;margin:32px 0 10px;letter-spacing:-.3px;color:var(--ink)}
h2 .bar{display:inline-block;width:6px;height:17px;border-radius:3px;background:linear-gradient(180deg,var(--blue),var(--purple));margin-right:9px;vertical-align:-2px}
h3{font-size:15px;margin:20px 0 6px;color:var(--ink)}
p,li{font-size:14px}
ul{margin:8px 0;padding-left:20px}
li{padding:3px 0}
.lead{font-size:15px;color:#31384a}
.callout{background:var(--soft);border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:10px;padding:14px 18px;margin:16px 0;font-size:13.5px}
table{width:100%;border-collapse:collapse;margin:14px 0;font-size:13.5px}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
th{background:var(--soft);font-weight:700;color:var(--ink)}
code{background:#0f1220;color:#e6f0ff;padding:2px 7px;border-radius:6px;font-size:12.5px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
pre{background:#0f1220;color:#e6f0ff;padding:16px 18px;border-radius:12px;overflow:auto;font-size:12.5px;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
pre code{background:none;padding:0}
.hub{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
.hub a{display:block;border:1px solid var(--line);border-radius:14px;padding:18px 20px;color:var(--ink);transition:box-shadow .15s,border-color .15s}
.hub a:hover{text-decoration:none;border-color:var(--blue);box-shadow:0 8px 26px rgba(0,122,255,.10)}
.hub a b{display:block;font-size:15px;margin-bottom:3px}
.hub a span{font-size:13px;color:var(--muted)}
.hero{width:100%;border-radius:16px;margin:6px 0 4px;display:block}
footer{max-width:860px;margin:0 auto;padding:22px 56px 40px;color:var(--muted);font-size:12px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
footer a{color:var(--muted)}
@media (max-width:640px){.wrap{padding:30px 20px}.hub{grid-template-columns:1fr}.topbar .in,footer{padding-left:20px;padding-right:20px}.topbar nav a{margin-left:12px}}