body{font-family:Inter,Segoe UI,Roboto,sans-serif;background-color:#f9fafb;color:#111827;margin:0;padding:0;line-height:1.6}h1,h2,h3{font-weight:600;margin-bottom:12px;color:#1f2937}button{background-color:#3b82f6;color:#fff;padding:10px 16px;border:none;border-radius:8px;font-weight:600;cursor:pointer;transition:background-color .2s ease}button:hover{background-color:#2563eb}button:disabled{background-color:#9ca3af;cursor:not-allowed}.alert{padding:12px;border-radius:6px;font-weight:500;margin-bottom:12px}.alert-error{background-color:#fee2e2;color:#991b1b}.alert-success{background-color:#dcfce7;color:#166534}