.courses-header {
    background-size: 100% 100%;
    background-repeat: no-repeat;
    color: white;
    padding: 4rem 5%;
    text-align: center;
    margin-bottom: 3rem;
}

.courses-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-family: 'Microsoft Yahei';
}

.courses-subtitle {
    color: white;
    font-family: 'Microsoft Yahei';
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 1000px;
    margin: 0 auto;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding: 0 5%;
    margin-bottom: 4rem;
}

.course-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.course-image {
    height: 200px;
    overflow: hidden;
    position: relative;
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.course-card:hover .course-image img {
    transform: scale(1.05);
}

.course-price-tag {
    position: absolute;
    top: 15px;
    right: 15px;
    background: #1E90FF;
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.course-info {
    padding: 1.5rem;
}

.course-title {
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
    color: #000000;
}

.course-description {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.8;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid #eee;
    padding-top: 1rem;
}

.course-author {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.author-avatar {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: #191970;
}

.course-date {
    color: #888;
    font-size: 0.9rem;
}

.empty-courses {
    text-align: center;
    padding: 3rem;
    color: #666;
}

.empty-courses i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #ddd;
}

@media (max-width: 768px) {
    .courses-grid {
grid-template-columns: 1fr;
    }
}