html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: system-ui, -apple-system, sans-serif;
}

#map {
    width: 100%;
    height: 100%;
}

#play-btn {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    padding: 16px 48px;
    font-size: 18px;
    font-weight: 600;
    color: white;
    background: #4facfe;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    z-index: 1000;
    transition: background 0.2s;
}

#play-btn:active {
    transform: translateX(-50%) scale(0.96);
}

#play-btn.playing {
    background: #f5576c;
}