:root{--bg:#f5f7fb;--panel:#fff;--text:#0f172a;--muted:#64748b;--border:#dbe2ea;--primary:#2563eb;--danger:#dc2626}*{box-sizing:border-box}html,body{color:var(--text);background:var(--bg);margin:0;padding:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}button,input,select,textarea{font:inherit}