/* 计时器样式 */
.counter {
    font-family: 'Share Tech Mono', monospace;
    font-size: 20px;
    background-color: #000;
    color: #f00;
    padding: 5px 10px;
    border-radius: 3px;
    min-width: 60px;
    text-align: center;
    transition: color 0.3s ease;
}

.counter.warning {
    color: orange;
}

.counter.danger {
    color: red;
    font-weight: bold;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}