/* 随机切换按钮 */
.random-choice .random-button {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
    background-color: #2563eb; /* 蓝色按钮 */
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    transition: background-color 0.2s;
}

/* 按钮悬停效果 */
.random-choice .random-button:hover {
    background-color: #1e40af;
}

.random-placeholder {
    text-align: center;
    margin-top: 1.5em;
    margin-bottom: 1.5em;
}