:root{--bg:#fafafa;--bg-soft:#ffffff;--fg:#1f2328;--muted:#6b7280;--border:#e5e7eb;--accent:#2563eb;--accent-soft:#eff6ff;--shadow:0 1px 2px rgba(0,0,0,.04), 0 1px 3px rgba(0,0,0,.06);--radius:10px}[data-theme=dark]{--bg:#0f1115;--bg-soft:#171a21;--fg:#e6e8eb;--muted:#9aa3ad;--border:#262b33;--accent:#3b82f6;--accent-soft:#16233b;--shadow:0 1px 2px rgba(0,0,0,.3)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,segoe ui,Roboto,pingfang sc,microsoft yahei,sans-serif;background:var(--bg);color:var(--fg);line-height:1.6;-webkit-font-smoothing:antialiased;display:flex;flex-direction:column;min-height:100vh}a{color:inherit;text-decoration:none}.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}.container{max-width:1080px;margin:0 auto;padding:0 20px}main{flex:1 0 auto;width:100%}.site-header{border-bottom:1px 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