body{margin:0;font-family:system-ui,sans-serif;background:#f5f5f5}button{background:#25d366;color:#fff;border:none;border-radius:4px;padding:6px 12px;font-size:1em;transition:background .2s}button:hover{background:#128c7e}select{padding:6px 12px;border-radius:4px;border:1px solid #ccc}.notification{position:fixed;top:24px;left:50%;transform:translate(-50%);background:#333;color:#fff;padding:12px 32px;border-radius:8px;box-shadow:0 2px 12px #00000026;z-index:1000;font-size:1rem;text-align:center;max-width:90vw}