.container {
    min-height: 100vh;
    background-color: #fff;
    display: flex;
    flex-direction: column;
}

.header {
    padding: 20px;
    background-color: #f5f5f5;
    text-align: center;
    border-bottom: 1px solid #ddd;
}

.title {
    font-size: 20px;
    font-weight: bold;
    margin: 0;
}

.progress-container {
    padding: 10px 20px;
    background-color: #f5f5f5;
    border-bottom: 1px solid #ddd;
}

.progress-text {
    font-size: 16px;
    color: #333;
    text-align: center;
}

.content {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
}

.word-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    padding: 5px;
}

.word-container {
    width: 30%;
    margin: 5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.word-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    flex-shrink: 0;
}

.word-button {
    flex: 1;
    height: 80px;
    background-color: #87ceeb;
    border-radius: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
}

.word-text {
    font-size: 18px;
    font-weight: 500;
    color: #333;
}

.bottom-container {
    padding: 20px;
    background-color: #f5f5f5;
    border-top: 1px solid #ddd;
}

.return-button {
    width: 100%;
    background-color: #FF6B6B;
    padding: 10px;
    border-radius: 5px;
    border: none;
    color: white;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
}

.word-button:hover, .return-button:hover {
    opacity: 0.9;
}

.word-button.checked {
    background-color: #b2dfee;  /* ここを変更 */
    border: 2px solid #87ceeb;  /* 必要に応じてボーダーの色も変更 */
}

.word-text {
    display: flex;
    flex-direction: column;
    align-items: center;
}