/* ����������ʽ */
.content-section {
    padding: 60px 0;
}

.content-wrapper {
    display: flex;
    gap: 40px;
}

/* ��������ʽ */
.main-content {
    flex: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .content-section {
        padding: 40px 0;
    }
    
    .content-wrapper {
        flex-direction: column;
        gap: 30px;
    }
    
    .sidebar {
        display: none;
    }
    
    .article {
        padding: 30px 20px;
        border-radius: 10px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    }
    
    .article h1 {
        font-size: 24px;
        line-height: 1.4;
    }
    
    .article-meta {
        flex-direction: column;
        gap: 10px;
        padding-bottom: 15px;
        font-size: 13px;
    }
    
    .article-content h2 {
        font-size: 20px;
        margin: 25px 0 15px;
    }
    
    .article-content h3 {
        font-size: 18px;
        margin: 20px 0 12px;
    }
    
    .article-content p {
        font-size: 14px;
        line-height: 1.7;
        text-align: left;
    }
    
    .outline-item {
        padding: 15px;
        margin-bottom: 15px;
    }
    
    .expert-item {
        flex-direction: column;
        text-align: center;
        gap: 15px;
        padding: 15px;
    }
    
    .expert-item img {
        width: 80px;
        height: 80px;
        margin: 0 auto;
    }
    
    .related-news {
        margin-top: 30px;
        padding: 20px;
    }
    
    .related-list {
        flex-direction: column;
        gap: 15px;
    }
    
    .related-item {
        flex-direction: row;
        align-items: center;
        gap: 15px;
        padding: 12px;
    }
    
    .related-item img {
        width: 80px;
        height: 60px;
        flex-shrink: 0;
    }
}

@media (max-width: 480px) {
    .content-section {
        padding: 30px 0;
    }
    
    .article {
        padding: 20px 15px;
    }
    
    .article h1 {
        font-size: 22px;
    }
    
    .article-content h2 {
        font-size: 18px;
    }
    
    .article-content h3 {
        font-size: 16px;
    }
    
    .article-content p {
        font-size: 13px;
    }
    
    .related-item {
        padding: 10px;
    }
    
    .related-item img {
        width: 70px;
        height: 50px;
    }
}

.article {
    background-color: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.article h1 {
    font-size: 32px;
    color: #2c3e50;
    margin-bottom: 20px;
    line-height: 1.3;
}

.article-meta {
    display: flex;
    gap: 30px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #e0e0e0;
    color: #7f8c8d;
    font-size: 14px;
}

.article-cover {
    margin-bottom: 30px;
    text-align: center;
}

.article-cover img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.article-content p {
    margin-bottom: 20px;
    line-height: 1.8;
    color: #333;
    text-align: justify;
}

.article-content h2 {
    font-size: 24px;
    color: #2c3e50;
    margin: 30px 0 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #3498db;
}

.article-content h3 {
    font-size: 20px;
    color: #2c3e50;
    margin: 25px 0 15px;
}

.article-content ul {
    margin-bottom: 20px;
    padding-left: 20px;
}

.article-content li {
    margin-bottom: 10px;
    line-height: 1.6;
}

/* �γ̴����ʽ */
.course-outline {
    margin-bottom: 30px;
}

.outline-item {
    margin-bottom: 20px;
    padding: 20px;
    background-color: #f8f9fa;
    border-left: 4px solid #3498db;
    border-radius: 0 4px 4px 0;
}

/* ʦ��������ʽ */
.teacher-list {
    margin-bottom: 30px;
}

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

.teacher-item img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
}

.teacher-info h4 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #2c3e50;
}

.teacher-info p {
    margin-bottom: 0;
    font-size: 14px;
    color: #666;
}

/* ѧԱ������ʽ */
.student-feedback {
    margin-bottom: 30px;
}

.student-feedback blockquote {
    margin-bottom: 20px;
    padding: 20px;
    background-color: #f8f9fa;
    border-left: 4px solid #3498db;
    font-style: italic;
}

.student-feedback blockquote p {
    margin-bottom: 10px;
}

.student-feedback blockquote footer {
    text-align: right;
    color: #7f8c8d;
    font-style: normal;
}

/* �γ̲�����ť */
.course-actions {
    display: flex;
    gap: 20px;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid #e0e0e0;
}

.btn-primary {
    background-color: #3498db;
    color: #fff;
    padding: 12px 30px;
    font-size: 16px;
    border-radius: 4px;
    text-decoration: none;
    transition: background-color 0.3s;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-secondary {
    background-color: #f8f9fa;
    color: #3498db;
    padding: 12px 30px;
    font-size: 16px;
    border: 1px solid #3498db;
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background-color: #3498db;
    color: #fff;
}

/* ��ؿγ���ʽ */
.related-courses {
    margin-top: 40px;
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.related-courses h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: #2c3e50;
}

.related-list {
    display: flex;
    gap: 20px;
}

.related-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: #333;
    transition: transform 0.3s;
}

.related-item:hover {
    transform: translateY(-5px);
}

.related-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 10px;
}

.related-item span {
    font-size: 14px;
    text-align: center;
}

/* �������ʽ */
.sidebar {
    width: 350px;
    flex-shrink: 0;
}

/* �γ���Ϣ��Ƭ */
.course-info-card {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.course-info-card h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: #2c3e50;
}

.info-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    font-size: 14px;
}

.info-item .label {
    color: #7f8c8d;
}

.info-item .price {
    color: #e74c3c;
    font-size: 18px;
    font-weight: bold;
}

/* ���ſγ� */
.hot-courses {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.hot-courses h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: #2c3e50;
}

.hot-courses ul {
    list-style: none;
}

.hot-courses li {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e0e0e0;
}

.hot-courses li:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.hot-courses a {
    color: #333;
    text-decoration: none;
    transition: color 0.3s;
}

.hot-courses a:hover {
    color: #3498db;
}

/* ��ϵ��ʽ��Ƭ */
.contact-card {
    background-color: #3498db;
    color: #fff;
    padding: 30px;
    border-radius: 8px;
    text-align: center;
}

.contact-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
}

.contact-card p {
    margin-bottom: 20px;
    font-size: 14px;
    opacity: 0.9;
}

.contact-phone {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 15px;
}