/* 教程页面样式 */

.tutorials-page {
    padding: 32px 0 80px;
    background: var(--bg-secondary);
}

.page-header {
    margin-bottom: 32px;
}

.page-header h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 16px;
}

/* 分类标签 */
.category-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.category-tab {
    padding: 10px 20px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 24px;
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.category-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.category-tab.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* 精选课程 */
.featured-courses {
    margin-bottom: 60px;
}

.section-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title i {
    color: var(--accent-color);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.courses-grid.large {
    grid-template-columns: 1.5fr 1fr 1fr;
}

.course-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.course-image {
    position: relative;
    height: 160px;
    background: linear-gradient(135deg, var(--primary-light) 0%, #E8F0FE 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-card.featured .course-image {
    height: 200px;
}

.image-placeholder {
    font-size: 56px;
    color: var(--primary-color);
    opacity: 0.3;
}

.image-placeholder.small {
    font-size: 48px;
}

.course-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--accent-color);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.course-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.course-card:hover .course-overlay {
    opacity: 1;
}

.play-btn {
    width: 56px;
    height: 56px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--primary-color);
}

.play-btn:hover {
    transform: scale(1.1);
}

.course-content {
    padding: 20px;
}

.course-meta {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 12px;
}

.level {
    padding: 4px 10px;
    border-radius: 10px;
    font-weight: 500;
}

.level.beginner {
    background: #E8F5E9;
    color: #43A047;
}

.level.intermediate {
    background: #FFF3E0;
    color: #FB8C00;
}

.level.advanced {
    background: #FCE4EC;
    color: #E91E63;
}

.duration, .lessons {
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.course-content h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.course-card.featured h3 {
    font-size: 18px;
}

.course-content p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
    margin-bottom: 16px;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.instructor {
    display: flex;
    align-items: center;
    gap: 8px;
}

.avatar {
    width: 28px;
    height: 28px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--text-tertiary);
}

.stats {
    display: flex;
    gap: 12px;
    font-size: 12px;
    color: var(--text-tertiary);
}

.stats span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 教程列表 */
.all-tutorials {
    margin-bottom: 60px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.sort-filter select {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    cursor: pointer;
}

.tutorials-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.tutorial-item {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.tutorial-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.tutorial-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #0044B8 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.tutorial-content {
    flex: 1;
}

.tutorial-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.category-tag {
    background: var(--primary-light);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 500;
}

.difficulty {
    padding: 4px 10px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 500;
}

.difficulty.easy {
    background: #E8F5E9;
    color: #43A047;
}

.difficulty.medium {
    background: #FFF3E0;
    color: #FB8C00;
}

.difficulty.hard {
    background: #FCE4EC;
    color: #E91E63;
}

.tutorial-content h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
}

.tutorial-content p {
    color: var(--text-secondary);
    font-size: 14px;
}

.tutorial-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.author-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.author-avatar {
    width: 24px;
    height: 24px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
}

.tutorial-stats {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-tertiary);
}

.tutorial-stats span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.btn-start {
    padding: 10px 24px;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.btn-start:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.btn-load-more {
    width: 100%;
    padding: 16px;
    background: white;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 15px;
    margin-top: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-load-more:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--primary-light);
}

/* 学习路径 */
.learning-paths {
    margin-bottom: 60px;
}

.paths-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.path-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 2px solid transparent;
}

.path-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
    transform: translateY(-4px);
}

.path-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #0044B8 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: white;
    margin-bottom: 20px;
}

.path-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.path-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.6;
}

.path-courses {
    list-style: none;
    margin-bottom: 20px;
}

.path-courses li {
    padding: 8px 0;
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.path-courses i {
    color: var(--secondary-color);
}

.path-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    font-size: 13px;
    color: var(--text-tertiary);
}

.path-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-path-start {
    width: 100%;
    padding: 12px;
    background: var(--primary-light);
    color: var(--primary-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
}

.btn-path-start:hover {
    background: var(--primary-color);
    color: white;
}

/* 响应式 */
@media (max-width: 1024px) {
    .courses-grid.large {
        grid-template-columns: 1fr;
    }

    .course-card.featured .course-image {
        height: 160px;
    }

    .course-card.featured h3 {
        font-size: 16px;
    }
}

@media (max-width: 768px) {
    .category-tabs {
        gap: 8px;
    }

    .category-tab {
        padding: 8px 16px;
        font-size: 13px;
    }

    .tutorial-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .tutorial-number {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }

    .btn-start {
        width: 100%;
        justify-content: center;
    }

    .tutorial-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}