:root{--color-bg:#f9fafb;--color-surface:#fff;--color-text:#111827;--color-text-muted:#6b7280;--color-border:#e5e7eb;--color-primary:#1e40af;--color-primary-light:#dbeafe;--color-primary-dark:#1e3a8a;--max-width:1200px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--color-bg);color:var(--color-text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Sans,Yu Gothic UI,system-ui,sans-serif;line-height:1.7}a{color:var(--color-primary);text-underline-offset:2px;text-decoration:underline;text-decoration-thickness:1px}a:hover{color:var(--color-primary-dark)}.skip-link{background:var(--color-primary);color:#fff;z-index:200;padding:8px 16px;position:absolute;top:0;left:-9999px}.skip-link:focus{left:0}.site-header{background:var(--color-surface);border-bottom:1px solid var(--color-border);z-index:100;padding:12px 0;position:sticky;top:0}.site-header-inner{max-width:var(--max-width);justify-content:space-between;align-items:center;gap:24px;margin:0 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