/* Reset some default styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Body & Page Background */
body {
    font-family: 'Arial', sans-serif;
    background-color: #f5f5f5;
    padding: 20px;
}

/* 页眉导航栏 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #2575fc;
    padding: 10px 30px;
    color: white;
    border-radius: 10px;
    margin-bottom: 30px;
}

.navbar .logo h1 {
    font-size: 24px;
    font-weight: bold;
}

.navbar-links a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-size: 16px;
    transition: color 0.3s;
}

.navbar-links a:hover {
    color: #f1c40f;
}

.navbar .avatar img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid white;
}

/* Dashboard 主体部分 */
.dashboard {
    max-width: 1200px;
    margin: 0 auto;
}

.dashboard-title {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 20px;
    text-align: center;
    
}

/* 课程卡片容器 */
.course-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}

/* 课程卡片 */
.course-card {
    width: 300px;
    height: 500px;
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    position: relative;
    transition: transform 0.3s;
}

.course-card:hover {
    transform: translateY(-10px); /* 提升效果 */
}

.course-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.course-info {
    padding: 20px;
}

.course-name {
    font-size: 22px;
    font-weight: bold;
    color: #333;
}

.course-description {
    font-size: 14px;
    color: #777;
    margin-top: 10px;
}
/* 右侧滑出进度卡片样式 */
.course-progress {
    position: fixed;
    top: 0;
    right: -400px;  /* 初始时在屏幕外 */
    width: 400px;
    height: 100%;
    background-color: #fff;
    box-shadow: -2px 0 5px rgba(0, 0, 0, 0.1);
    padding: 30px;
    transition: right 0.3s ease;
    z-index: 9999;
    border-radius: 15px;  /* 添加圆角 */
}

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

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

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}


/* 章节和子章节样式 */
.chapter-list {
    list-style-type: none;
    padding-left: 0;
}

.chapter-item {
    margin: 5px 0;
    padding: 5px;
    cursor: pointer;
}

.chapter-item .chapter-title {
    font-size: 16px;
    font-weight: bold;
}

.chapter-item .sub-chapter-list {
    display: none; /* 初始状态下子章节隐藏 */
    padding-left: 20px;
}

.chapter-item.open .sub-chapter-list {
    display: block; /* 展开时显示子章节 */
}

.chapter-item:hover {
    background-color: #f1f1f1;
    border-radius: 5px;
}

/* 子章节的样式 */
.sub-chapter-item {
    margin: 3px 0;
    padding: 3px;
    font-size: 14px;
}

.sub-chapter-item:hover {
    background-color: #e8e8e8;
}