:root{--bg: #fafafa;--surface: #ffffff;--text: #1d1d1f;--text-soft: #6b6b70;--border: #e6e6e6;--accent: #1d1d1f;--code-bg: #f2f2f2;--chip-bg: #f0eefb;--chip-text: #534AB7;--max: 720px;--max-wide: 960px;--radius: 14px}[data-theme=dark]{--bg: #0e0e10;--surface: #161618;--text: #ececf1;--text-soft: #9a9aa2;--border: #262629;--accent: #ececf1;--code-bg: #1c1c1f;--chip-bg: #2a2440;--chip-text: #b9aef0}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.container{max-width:var(--max);margin:0 auto;padding:0 20px}.site-header{display:flex;align-items:center;justify-content:space-between;max-width:var(--max-wide);margin:0 auto;padding:26px 20px}.site-header .brand{font-weight:700;font-size:20px;letter-spacing:.5px}.site-header 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