/* 课程首页样式 */
.courses-hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #6A11CB 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
    margin-bottom: 60px;
}

.courses-hero h1 {
    font-size: 3rem;
    margin-bottom: 16px;
}

.courses-hero p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* 课程网格 */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    padding: 40px 0;
}

.course-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    cursor: pointer;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.course-card-header {
    padding: 30px 24px;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, #3A5BD0 100%);
    color: white;
}

.course-card-header h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.course-card-body {
    padding: 24px;
}

.course-card-body p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    color: var(--text-light);
    font-size: 0.9rem;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

/* 单个课程页面 */
.course-header {
    background: var(--bg-primary);
    padding: 60px 0;
    text-align: center;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
}

.course-title {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.course-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto;
}

/* 实验作业网格 */
.experiments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    padding: 40px 0;
}

.experiment-card {
    padding: 30px;
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.experiment-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.experiment-card h3 {
    margin-bottom: 16px;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.experiment-card p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 0.95rem;
}

/* 标签样式 */
.tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-right: 8px;
    margin-bottom: 8px;
}

.tag-primary {
    background-color: rgba(77, 119, 255, 0.1);
    color: var(--primary-color);
}

.tag-success {
    background-color: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
}

.tag-warning {
    background-color: rgba(255, 167, 38, 0.1);
    color: var(--warning-color);
}

/* 作业详情页面 */
.assignment-detail {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-sm);
    margin: 40px auto;
    max-width: 800px;
}

.assignment-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.assignment-content {
    line-height: 1.8;
}

.assignment-content h3 {
    margin: 24px 0 16px;
    color: var(--text-primary);
}

.assignment-content pre {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 20px 0;
}

.code-block {
    background: #f8f9fa;
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    margin: 20px 0;
    font-family: 'Consolas', 'Monaco', monospace;
}