:root{--bg:#f6f7f9;--surface:#ffffff;--border:#e2e5ea;--text:#1c1f24;--muted:#6b7280;--primary:#2563eb;--primary-hover:#1d4ed8;--danger:#dc2626;--success:#16a34a;--radius:8px}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:15px;line-height:1.5}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}button,input,select{font:inherit}