:root{--bg:#fff;--fg:#1f1f1f;--muted:#6b7280;--border:#e5e7eb;--border-strong:#d1d5db;--accent:#3730a3;--accent-soft:#eef2ff;--radius:10px;--max:1000px;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Inter","Helvetica Neue",Arial,sans-serif;--mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font);color:var(--fg);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;font-size:16px}a{color:inherit;text-decoration:none}button{font-family:var(--font)}.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}.header{position:-webkit-sticky;position:sticky;top:0;z-index:50;background:hsla(0,0%,100%,.9);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}.nav{justify-content:space-between;height:60px}.logo,.nav{display:flex;align-items:center}.logo{gap:8px;font-weight:600;letter-spacing:-.01em}.logo 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