/* Teacherboard 样式 */
.teacherboard {
    padding: 20px;
    font-family: Arial, sans-serif;
}

.teacherboard-title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 20px;
}

.course-cards {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    gap: 20px;
}

.course-card {
    width: 250px;
    background-color: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    cursor: pointer;
}

.course-image {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 5px;
}

.course-info {
    margin-top: 10px;
}

.course-name {
    font-size: 20px;
    font-weight: bold;
}

.course-description {
    font-size: 14px;
    color: #555;
}

/* 课程目录弹出框 */

.course-details {
    position: fixed;
    top: 0;
    right: -400px;
    width: 300px;
    height: 100%;
    background-color: #fff;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    transition: right 0.3s ease;
    z-index: 9999;
    border-radius: 15px;  /* 添加圆角 */
}

.course-details.open {
    right: 0;  /* 打开时显示 */
}

.details-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.details-header button {
    background-color: transparent;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

.details-content {
    padding-right: 20px;
}
.lesson-item {
    display: flex;
    align-items: center;
    justify-content: space-between; /* 让垃圾桶靠右 */
    padding: 5px 0;
}
.lesson-text {
    cursor: pointer;  /* 鼠标悬停时变成手指 */
    transition: color 0.3s;
    flex: 1;  /* 占据左侧空间 */
}

.lesson-text:hover {
    color: #2575fc;  /* 这里你可以设置悬停时的颜色 */
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    margin-left: 8px;
    color: #666;
    font-size: 14px;
    transition: color 0.2s;
}

.icon-btn:hover {
    color: #2575fc; /* hover 高亮 */
}

.delete-btn {
    color: #c0392b; /* 红色垃圾桶 */
}

.delete-btn:hover {
    color: #e74c3c;
}
.new-chapter-input {
    width: 200px;
    padding: 8px;
    margin-top: 10px;
    margin-bottom: 10px;
    font-size: 14px;
    border-radius: 4px;
    border: 1px solid #ddd;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    margin-left: 8px;
    color: #666;
    font-size: 14px;
    transition: color 0.2s;
}

.icon-btn:hover {
    color: #2575fc; /* hover 高亮 */
}

.delete-btn {
    color: #c0392b; /* 红色垃圾桶 */
}

.delete-btn:hover {
    color: #e74c3c;
}


.add-chapter-btn {
    background-color: #2575fc;
    color: white;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
}

/* 编辑弹窗 */
.edit-modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.edit-modal-content {
    display: flex;
    flex-direction: column;
}

.edit-modal-content input,
.edit-modal-content textarea {
    margin-bottom: 10px;
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.edit-modal-content button {
    background-color: #2575fc;
    color: white;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
}