:root{--color-bg:#fff;--color-text:#1a1a1e;--color-text-muted:#5b5b66;--color-border:#e6e6eb;--color-accent:#4f46e5;--color-accent-soft:#eef2ff;--color-card:#f8f8fa;--max-width:72rem;--radius:.75rem}*,:before,:after{box-sizing:border-box}html{color:var(--color-text);background:var(--color-bg);-webkit-text-size-adjust:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;line-height:1.6}body{flex-direction:column;min-height:100vh;margin:0;display:flex}main{flex:1}img{max-width:100%;height:auto}a{color:var(--color-accent);text-decoration:none}a:hover{text-decoration:underline}.container{width:100%;max-width:var(--max-width);margin-inline:auto;padding-inline:1.25rem}h1{margin:0 0 1rem;font-size:2.25rem;line-height:1.2}h2{margin:2.5rem 0 1rem;font-size:1.5rem}h3{margin:1.75rem 0 .75rem;font-size:1.2rem}.lede{color:var(--color-text-muted);max-width:46rem;font-size:1.2rem}.site-header{border-bottom:1px 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