:root{--navy: #0d3b66;--sea: #1b6ca8;--accent: #1e88d6;--bg: #ffffff;--surface: #f3f7fb;--text: #13212e;--muted: #5a6b7b;--border: #d8e2ec;--notice-bg: #fff6e5;--notice-border: #f0c36d;color-scheme:light dark}@media(prefers-color-scheme:dark){:root{--navy: #8ec5ff;--sea: #9ad0ec;--accent: #6cb6ff;--bg: #0e1620;--surface: #15212e;--text: #e4edf5;--muted: #9db0c2;--border: #263646;--notice-bg: #2b2414;--notice-border: #7a5d22}}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:17px;line-height:1.6;color:var(--text);background:var(--bg)}#root{min-height:100vh;display:flex;flex-direction:column}main{flex:1}a{color:var(--accent)}h1,h2,h3{color:var(--navy);line-height:1.25}h1{font-size:2.2rem;margin:0 0 .6em}h2{font-size:1.5rem;margin:1.8em 0 .6em}h3{font-size:1.15rem;margin:0 0 .4em}code{background:var(--surface);border:1px solid var(--border);border-radius:4px;padding:.05em .35em}.container{max-width:1040px;margin:0 auto;padding:0 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