* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #1a1a1a;
    color: white;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    width: 100%;
    max-width: 1200px;
    padding: 20px;
}

.controls {
    text-align: right;
    margin-bottom: 20px;
}

.mute-button {
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: 10px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
}

.mute-button:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.sirens-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.siren-item {
    background-color: #2a2a2a;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s;
}

.siren-item:hover {
    transform: scale(1.02);
}

.siren-item.active {
    background-color: #3a3a3a;
}

.light {
    width: 150px;
    height: 150px;
    margin: 0 auto 15px;
    border-radius: 50%;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}

.air-raid {
    background-image: url('static/img/a2.png');
}

.ambulance {
    background-image: url('static/img/a3.png');
}

.fire-truck {
    background-image: url('static/img/a4.png');
}

.police1 {
    background-image: url('static/img/a5.png');
}

.police2 {
    background-image: url('static/img/a5.png');
}

.warning {
    background-image: url('static/img/w_warning_light_off.png');
}

/* 闪烁动画 */
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.light.active {
    animation: blink 0.5s infinite;
}

.warning.active {
    background-image: url('static/img/w_warning_light_on.png');
}

.siren-item p {
    margin-top: 10px;
    font-size: 16px;
    color: #fff;
} 
.footer {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
    color: #888;
}