body::before {
    content: "DEMO MODE - ALL WEATHER READINGS ARE SIMULATED";
    display: block; position: sticky; top: 0; z-index: 10000;
    padding: 12px 16px; background: #ffdc82; color: #382700;
    text-align: center; font: bold 15px/1.5 system-ui, sans-serif;
}