body {
    font-family: 'Arial', sans-serif;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
    background-color: #f5f5f5;
}

h1 {
    color: #333;
    margin-bottom: 30px;
}

.slider-container {
    margin: 30px 0;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#reloadSlider {
    width: 100%;
    margin: 15px 0;
    accent-color: #4CAF50;
}

#sliderValue {
    display: inline-block;
    min-width: 50px;
    font-weight: bold;
    color: #2c3e50;
}

.time-unit {
    margin-left: 5px;
    color: #7f8c8d;
}

.button-container {
    margin: 25px 0;
}

button {
    padding: 12px 24px;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    margin: 0 10px;
    transition: all 0.3s ease;
}

#startBtn {
    background-color: #4CAF50;
    color: white;
}

#startBtn:hover {
    background-color: #45a049;
    transform: translateY(-2px);
}

#stopBtn {
    background-color: #e74c3c;
    color: white;
}

#stopBtn:hover:not(.disabled) {
    background-color: #c0392b;
    transform: translateY(-2px);
}

.disabled {
    background-color: #95a5a6 !important;
    cursor: not-allowed;
    transform: none !important;
}

#nextReload {
    margin-top: 30px;
    padding: 15px;
    font-size: 1.2em;
    color: #2c3e50;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* レスポンシブ対応 */
@media (max-width: 480px) {
    .button-container {
        display: flex;
        flex-direction: column;
    }
    
    button {
        margin: 5px 0;
        width: 100%;
    }
}