.modern-countdown-timer {
    max-width: 400px;
    margin: 20px auto;
    padding: 20px;
    background: #f5f5f5;
    border-radius: 8px;
    text-align: center;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.timer-container {
    padding: 20px;
}

#countdown-time {
    padding: 8px;
    margin: 10px;
    width: 150px;
    text-align: center;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    padding: 8px 16px;
    margin: 5px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.countdown-display {
    font-size: 48px;
    font-weight: bold;
    margin: 20px 0;
    font-family: monospace;
}