:root {
    --deep-space-blue: #0A2463;
    --starlight-gold: #FFD700;
    --light-blue: #3E92CC;
    --dark-blue: #1E3A8A;
    --white: #FFFFFF;
    --light-gray: #F5F5F5;
    --dark-gray: #666666;
}

.course-detail-main {
    margin-top: 92px;
    min-height: calc(100vh - 92px);
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.breadcrumb {
    padding: 20px 0;
    font-size: 14px;
    color: #666;
}

.breadcrumb a {
    color: #666;
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb a:hover {
    color: var(--deep-space-blue);
}

.breadcrumb .separator {
    margin: 0 8px;
    color: #ccc;
}

.breadcrumb .current {
    color: var(--deep-space-blue);
    font-weight: 500;
}

.course-detail-content {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 30px;
    padding-bottom: 60px;
}

.main-content {
    background-color: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.course-header {
    padding: 30px;
    border-bottom: 1px solid #e0e0e0;
}

.course-category {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.category-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--light-blue);
    color: var(--white);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.grade-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--starlight-gold);
    color: var(--deep-space-blue);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.course-title {
    font-size: 28px;
    font-weight: bold;
    color: var(--deep-space-blue);
    margin-bottom: 20px;
    line-height: 1.4;
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: #666;
    font-size: 14px;
}

.meta-item svg {
    color: var(--light-blue);
}

.course-cover {
    padding: 20px;
    border-bottom: 1px solid #e0e0e0;
}

.cover-image-wrapper {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    height: 200px;
    display: flex;
    align-items: flex-end;
}

.cover-image {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: bottom;
}

.cover-title {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 12px 20px;
    background: linear-gradient(135deg, rgba(10, 36, 99, 0.9) 0%, rgba(62, 146, 204, 0.9) 100%);
    color: white;
    font-size: 20px;
    font-weight: 700;
    text-align: center;
    letter-spacing: 1px;
    border-radius: 6px;
}

.cover-placeholder {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #999;
}

.cover-placeholder svg {
    color: #ccc;
    margin-bottom: 15px;
}

.cover-placeholder p {
    font-size: 16px;
    color: #999;
}

.course-tabs {
    display: flex;
    border-bottom: 2px solid #e0e0e0;
    background-color: #f8f9fa;
}

.tab-btn {
    flex: 1;
    padding: 18px 20px;
    background: none;
    border: none;
    font-size: 16px;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.tab-btn:hover {
    color: var(--deep-space-blue);
    background-color: #f0f0f0;
}

.tab-btn.active {
    color: var(--deep-space-blue);
    font-weight: 600;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--starlight-gold);
}

.tab-content {
    display: none;
    padding: 30px;
}

.tab-content.active {
    display: block;
}

.tab-buttons {
    display: flex;
    width: 100%;
}

.tab-contents {
    width: 100%;
}

.content-section {
    margin-bottom: 30px;
}

.content-section:last-child {
    margin-bottom: 0;
}

.content-section h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--deep-space-blue);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--starlight-gold);
    display: inline-block;
}

.content-section p {
    color: #666;
    line-height: 1.8;
    margin-bottom: 15px;
}

.learning-objectives {
    list-style: none;
    padding: 0;
}

.learning-objectives li {
    padding: 10px 0 10px 30px;
    position: relative;
    color: #666;
    line-height: 1.6;
}

.learning-objectives li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--starlight-gold);
    font-weight: bold;
    font-size: 18px;
}

.course-harvest {
    padding: 30px;
}

.section-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--deep-space-blue);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--starlight-gold);
    display: inline-block;
}

.section-title::after {
    display: none;
}

.harvest-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.harvest-item {
    padding: 20px;
    background: linear-gradient(135deg, rgba(62, 146, 204, 0.05) 0%, rgba(10, 36, 99, 0.05) 100%);
    border-radius: 8px;
    border-left: 4px solid var(--starlight-gold);
    transition: all 0.3s ease;
    text-align: center;
}

.harvest-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(10, 36, 99, 0.15);
    background: linear-gradient(135deg, rgba(62, 146, 204, 0.1) 0%, rgba(10, 36, 99, 0.1) 100%);
}

.harvest-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.harvest-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--deep-space-blue);
    margin-bottom: 10px;
}

.harvest-description {
    color: #666;
    line-height: 1.6;
    font-size: 14px;
}

.target-audience {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

/* 课程呈现形式样式 */
.course-presentation {
    padding: 30px;
}

.presentation-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.presentation-item {
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.presentation-item:hover {
    background-color: #e8ecf1;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.presentation-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--deep-space-blue);
    margin-bottom: 10px;
}

.presentation-description {
    color: #666;
    line-height: 1.6;
    font-size: 14px;
}

.audience-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.audience-item:hover {
    background-color: #e8ecf1;
    transform: translateY(-2px);
}

.audience-icon {
    font-size: 24px;
}

.course-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.feature-item {
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
    transition: all 0.3s ease;
    margin-bottom: 15px;
}

.feature-item:hover {
    background-color: #e8ecf1;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.feature-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--deep-space-blue);
    margin-bottom: 10px;
}

.feature-description {
    color: #666;
    line-height: 1.6;
    font-size: 14px;
}

.syllabus-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.syllabus-item {
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.syllabus-item:hover {
    border-color: var(--light-blue);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.syllabus-header {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-bottom: 1px solid #e0e0e0;
}

.week-badge {
    display: inline-block;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--deep-space-blue) 100%);
    color: var(--white);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.syllabus-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--deep-space-blue);
    margin: 0;
}

.syllabus-content {
    padding: 15px 20px;
}

.syllabus-content p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 10px;
}

.lesson-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.lesson-list li {
    padding: 5px 0 5px 20px;
    position: relative;
    color: #666;
    font-size: 14px;
}

.lesson-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--light-blue);
    font-weight: bold;
}

.teacher-info {
    display: flex;
    gap: 20px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.teacher-avatar {
    flex-shrink: 0;
    width: 100px;
    height: 100px;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--deep-space-blue) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 36px;
    font-weight: bold;
}

.teacher-details h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--deep-space-blue);
    margin-bottom: 5px;
}

.teacher-title {
    color: var(--light-blue);
    font-size: 14px;
    margin-bottom: 10px;
}

.teacher-bio {
    color: #666;
    line-height: 1.6;
    margin-bottom: 15px;
}

.teacher-stats {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.stat-item {
    color: #666;
    font-size: 14px;
}

.reviews-summary {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 30px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
    margin-bottom: 30px;
}

.overall-rating {
    text-align: center;
}

.rating-score {
    font-size: 48px;
    font-weight: bold;
    color: var(--deep-space-blue);
    line-height: 1;
}

.rating-stars {
    margin: 10px 0;
    color: var(--starlight-gold);
    font-size: 24px;
}

.rating-count {
    color: #666;
    font-size: 14px;
}

.rating-breakdown {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
}

.rating-bar {
    display: flex;
    align-items: center;
    gap: 10px;
}

.bar-label {
    width: 30px;
    font-size: 14px;
    color: #666;
}

.bar-container {
    flex: 1;
    height: 8px;
    background-color: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--starlight-gold) 0%, #FFA500 100%);
    border-radius: 4px;
}

.bar-count {
    width: 30px;
    font-size: 14px;
    color: #666;
    text-align: right;
}

.review-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.review-item {
    padding: 20px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.review-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.reviewer-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.reviewer-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--deep-space-blue) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: bold;
}

.reviewer-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.reviewer-name {
    font-weight: 500;
    color: var(--deep-space-blue);
}

.review-date {
    font-size: 12px;
    color: #999;
}

.review-rating {
    color: var(--starlight-gold);
    font-size: 16px;
}

.review-rating .star:last-child {
    color: #ccc;
}

.review-content p {
    color: #666;
    line-height: 1.6;
    margin: 0;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar-card {
    background-color: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    padding: 20px;
}

.sidebar-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--deep-space-blue);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--starlight-gold);
}

.course-action {
    position: sticky;
    top: 112px;
}

.action-price {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e0e0e0;
}

.price-label {
    font-size: 14px;
    color: #666;
}

.price-value {
    font-size: 28px;
    font-weight: bold;
    color: var(--deep-space-blue);
}

.btn-large {
    width: 100%;
    padding: 14px 20px;
    font-size: 16px;
    margin-bottom: 10px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--deep-space-blue) 100%);
    color: var(--white);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(10, 36, 99, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--deep-space-blue);
    border: 2px solid var(--deep-space-blue);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn-secondary:hover {
    background-color: var(--deep-space-blue);
    color: var(--white);
}

.btn-outline {
    background-color: transparent;
    color: var(--deep-space-blue);
    border: 2px solid var(--deep-space-blue);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    padding: 10px 20px;
    width: 100%;
}

.btn-outline:hover {
    background-color: var(--deep-space-blue);
    color: var(--white);
}

.action-info {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    font-size: 14px;
}

.info-label {
    color: #666;
}

.info-value {
    color: var(--deep-space-blue);
    font-weight: 500;
}

.recommended-courses {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.recommended-course {
    display: flex;
    gap: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.recommended-course:hover {
    transform: translateX(5px);
}

.course-thumb {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
}

.thumb-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.course-info h4 {
    font-size: 14px;
    font-weight: 500;
    color: var(--deep-space-blue);
    margin-bottom: 5px;
    line-height: 1.4;
}

.course-info p {
    font-size: 12px;
    color: #999;
    margin: 0;
}

.resource-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.resource-list li {
    padding: 8px 0;
    border-bottom: 1px solid #f0f0f0;
}

.resource-list li:last-child {
    border-bottom: none;
}

.resource-list a {
    color: #666;
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 14px;
}

.resource-list a:hover {
    color: var(--deep-space-blue);
}

.contact-info p {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 15px;
}

.directions-container {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.direction-item {
    display: flex;
    align-items: flex-start;
    gap: 25px;
    background: var(--white);
    border-radius: 16px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.direction-item:hover {
    transform: translateX(8px);
    box-shadow: 0 8px 30px rgba(10, 36, 99, 0.15);
}

.direction-item.agriculture {
    border-left-color: #4CAF50;
}

.direction-item.agriculture .direction-icon {
    background: linear-gradient(135deg, #4CAF50 0%, #8BC34A 100%);
}

.direction-item.manufacturing {
    border-left-color: #FF9800;
}

.direction-item.manufacturing .direction-icon {
    background: linear-gradient(135deg, #FF9800 0%, #FFC107 100%);
}

.direction-item.aerospace {
    border-left-color: #2196F3;
}

.direction-item.aerospace .direction-icon {
    background: linear-gradient(135deg, #2196F3 0%, #03A9F4 100%);
}

.direction-item.ai {
    border-left-color: #00BCD4;
}

.direction-item.ai .direction-icon {
    background: linear-gradient(135deg, #00BCD4 0%, #009688 100%);
}

.direction-item.life-science {
    border-left-color: #9C27B0;
}

.direction-item.life-science .direction-icon {
    background: linear-gradient(135deg, #9C27B0 0%, #E91E63 100%);
}

.direction-icon {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.direction-icon img {
    width: 60%;
    height: 60%;
    object-fit: contain;
}

.direction-info {
    flex: 1;
}

.direction-name {
    font-size: 22px;
    font-weight: 700;
    color: var(--deep-space-blue);
    margin: 0 0 8px 0;
}

.direction-slogan {
    font-size: 16px;
    font-weight: 600;
    color: var(--light-blue);
    margin: 0 0 15px 0;

}

.direction-desc {
    font-size: 14px;
    line-height: 1.8;
    color: #666;
    margin: 0 0 20px 0;
}

.direction-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.direction-tags .tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--light-gray);
    border-radius: 20px;
    font-size: 13px;
    color: var(--deep-space-blue);
    font-weight: 500;
    transition: all 0.2s ease;
}

.direction-tags .tag:hover {
    transform: translateY(-2px);
}

.agriculture-tags .tag {
    background: rgba(76, 175, 80, 0.1);
    color: #4CAF50;
    border: 1px solid rgba(76, 175, 80, 0.3);
}

.agriculture-tags .tag:hover {
    background: #4CAF50;
    color: white;
    border-color: #4CAF50;
}

.manufacturing-tags .tag {
    background: rgba(255, 152, 0, 0.1);
    color: #FF9800;
    border: 1px solid rgba(255, 152, 0, 0.3);
}

.manufacturing-tags .tag:hover {
    background: #FF9800;
    color: white;
    border-color: #FF9800;
}

.aerospace-tags .tag {
    background: rgba(33, 150, 243, 0.1);
    color: #2196F3;
    border: 1px solid rgba(33, 150, 243, 0.3);
}

.aerospace-tags .tag:hover {
    background: #2196F3;
    color: white;
    border-color: #2196F3;
}

.ai-tags .tag {
    background: rgba(0, 188, 212, 0.1);
    color: #00BCD4;
    border: 1px solid rgba(0, 188, 212, 0.3);
}

.ai-tags .tag:hover {
    background: #00BCD4;
    color: white;
    border-color: #00BCD4;
}

.life-science-tags .tag {
    background: rgba(156, 39, 176, 0.1);
    color: #9C27B0;
    border: 1px solid rgba(156, 39, 176, 0.3);
}

.life-science-tags .tag:hover {
    background: #9C27B0;
    color: white;
    border-color: #9C27B0;
}

@media (max-width: 992px) {
    .course-cover {
        padding: 25px;
    }

    .cover-title {
        font-size: 24px;
        padding: 18px 25px;
    }

    .directions-container {
        gap: 20px;
    }

    .direction-item {
        padding: 20px;
        gap: 20px;
    }

    .direction-icon {
        width: 70px;
        height: 70px;
    }

    .direction-name {
        font-size: 20px;
    }

    .direction-slogan {
        font-size: 15px;
    }

    .direction-desc {
        font-size: 13px;
    }

    .direction-tags .tag {
        font-size: 12px;
        padding: 5px 12px;
    }

    .agriculture-tags .tag,
    .manufacturing-tags .tag,
    .aerospace-tags .tag,
    .ai-tags .tag,
    .life-science-tags .tag {
        font-size: 12px;
        padding: 5px 12px;
    }
}

@media (max-width: 768px) {
    .course-cover {
        padding: 20px;
    }

    .cover-image-wrapper {
        border-radius: 6px;
    }

    .cover-title {
        font-size: 22px;
        padding: 15px 20px;
        letter-spacing: 1px;
    }

    .direction-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .direction-icon {
        width: 90px;
        height: 90px;
    }

    .direction-name {
        font-size: 18px;
    }

    .direction-slogan {
        font-size: 14px;
    }

    .direction-desc {
        font-size: 13px;
    }

    .direction-tags {
        justify-content: center;
    }

    .direction-tags .tag {
        font-size: 11px;
        padding: 4px 10px;
    }

    .agriculture-tags .tag,
    .manufacturing-tags .tag,
    .aerospace-tags .tag,
    .ai-tags .tag,
    .life-science-tags .tag {
        font-size: 11px;
        padding: 4px 10px;
    }
}



.floating-toolbar {
    position: fixed;
    right: 30px;
    bottom: 30px;
    transform: none;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.toolbar-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--deep-space-blue) 100%);
    color: white;
    border-radius: 50px;
    box-shadow: 0 4px 12px rgba(10, 36, 99, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.toolbar-item:hover {
    transform: translateX(-10px);
    box-shadow: 0 6px 16px rgba(10, 36, 99, 0.4);
}

.toolbar-item svg {
    flex-shrink: 0;
}

.toolbar-item span {
    font-size: 14px;
    font-weight: 500;
}

@media (max-width: 992px) {
    .course-detail-content {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .reviews-summary {
        grid-template-columns: 1fr;
    }

    .overall-rating {
        margin-bottom: 20px;
    }
}

/* 课程结构部分颜色样式 */
.structure-section {
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 25px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.structure-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* 为每个部分添加渐变背景 */
.section-color-blue {
    background: linear-gradient(135deg, #E6F0FF 0%, #F0F7FF 100%);
    border-left: 4px solid #1E3A8A;
}

.section-color-light-blue {
    background: linear-gradient(135deg, #E6F7FF 0%, #F0FCFF 100%);
    border-left: 4px solid #3E92CC;
}

.section-color-green {
    background: linear-gradient(135deg, #F0FFF4 0%, #F7FFF9 100%);
    border-left: 4px solid #4CAF50;
}

.section-color-orange {
    background: linear-gradient(135deg, #FFF7EB 0%, #FFFBF5 100%);
    border-left: 4px solid #FF9800;
}

.section-color-red {
    background: linear-gradient(135deg, #FFF0F0 0%, #FFFAFA 100%);
    border-left: 4px solid #F44336;
}

.section-color-purple {
    background: linear-gradient(135deg, #F3E5F5 0%, #FAF7FD 100%);
    border-left: 4px solid #9C27B0;
}

/* 为每个部分添加装饰元素 */
.section-color-blue::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="80" cy="20" r="10" fill="rgba(30, 58, 138, 0.1)"/></svg>');
    background-repeat: no-repeat;
    opacity: 0.5;
}

.section-color-light-blue::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="80" cy="20" r="10" fill="rgba(62, 146, 204, 0.1)"/></svg>');
    background-repeat: no-repeat;
    opacity: 0.5;
}

.section-color-green::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="80" cy="20" r="10" fill="rgba(76, 175, 80, 0.1)"/></svg>');
    background-repeat: no-repeat;
    opacity: 0.5;
}

.section-color-orange::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="80" cy="20" r="10" fill="rgba(255, 152, 0, 0.1)"/></svg>');
    background-repeat: no-repeat;
    opacity: 0.5;
}

.section-color-red::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="80" cy="20" r="10" fill="rgba(244, 67, 54, 0.1)"/></svg>');
    background-repeat: no-repeat;
    opacity: 0.5;
}

.section-color-purple::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="80" cy="20" r="10" fill="rgba(156, 39, 176, 0.1)"/></svg>');
    background-repeat: no-repeat;
    opacity: 0.5;
}

.section-subtitle {
    font-size: 20px;
    font-weight: 700;
    color: var(--deep-space-blue);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid rgba(10, 36, 99, 0.1);
    display: inline-block;
}

.section-description {
    line-height: 1.7;
    color: #555;
    margin-bottom: 15px;
}

/* 课程结构部分的列表样式 */
.structure-section ul {
    list-style: none;
    padding: 0;
    margin: 15px 0;
}

.structure-section ul li {
    padding: 8px 0 8px 25px;
    position: relative;
    color: #555;
    line-height: 1.6;
    transition: all 0.2s ease;
}

.structure-section ul li:hover {
    color: var(--deep-space-blue);
    transform: translateX(5px);
}

.structure-section ul li::before {
    content: '•';
    position: absolute;
    left: 10px;
    color: var(--light-blue);
    font-weight: bold;
    font-size: 18px;
}

/* 课程安排部分的样式 */
.structure-section ul:last-child {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.structure-section ul:last-child li::before {
    content: '📚';
    font-size: 14px;
}

/* 响应式设计优化 */
@media (max-width: 768px) {
    .structure-section {
        padding: 20px;
        margin-bottom: 20px;
    }
    
    .section-subtitle {
        font-size: 18px;
    }
    
    .structure-section ul li {
        padding: 6px 0 6px 20px;
    }
    
    .structure-section ul li::before {
        left: 5px;
        font-size: 16px;
    }
}

@media (max-width: 768px) {
    .course-cover {
        padding: 15px;
    }

    .cover-title {
        font-size: 16px;
        padding: 10px 15px;
        letter-spacing: 0.5px;
    }

    .course-title {
        font-size: 24px;
    }

    .course-meta {
        flex-direction: column;
        gap: 10px;
    }

    .course-tabs {
        overflow-x: auto;
    }

    .tab-btn {
        white-space: nowrap;
        min-width: 100px;
    }

    .target-audience {
        grid-template-columns: 1fr;
    }

    .course-features {
        grid-template-columns: 1fr;
    }

    .teacher-info {
        flex-direction: column;
        text-align: center;
    }

    .teacher-stats {
        justify-content: center;
    }

    .structure-section {
        padding: 15px;
        margin-bottom: 15px;
    }

    .section-subtitle {
        font-size: 16px;
    }
}