:root{--bg:#f6f7f9;--surface:#fff;--border:#e3e6ea;--text:#1f2430;--muted:#6b7280;--accent:#3b5bdb;--accent-soft:#edf0fc;--green:#2f9e44;--green-soft:#e9f6ec;--amber:#e8a33d;--amber-soft:#fbf3e3;--red:#d6453d;--red-soft:#fae9e8;--radius:10px;--shadow:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.04)}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji;font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}h1{font-size:22px;margin:0 0 4px}h2{font-size:16px;margin:0 0 12px}h3{font-size:14px;margin:0 0 8px}.topnav{background:var(--surface);border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;z-index:20}.topnav-inner{max-width:1180px;margin:0 auto;padding:0 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