.courseDetail_1 .sidebar {
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 15px var(--primary);
    overflow: hidden;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.courseDetail_1 .sidebar:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.courseDetail_1 .sidebar-header {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: white;
    padding: 1.2rem 1.5rem;
    font-weight: 600;
    font-size: 1.2rem;
}

.courseDetail_1 .subject-item {
    border-bottom: 1px solid #f0f0f0;
}

.courseDetail_1 .subject-title {
    padding: 1rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
}

.courseDetail_1 .subject-title:hover {
    background-color: #f8f9ff;
    color: var(--primary);
}

.courseDetail_1 .course-card {
    transition: all 0.3s ease;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
    border: none;
}

.courseDetail_1 .course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0.5rem 1.5rem 0 var(--primary);
}

.courseDetail_1 .course-img {
    height: 450px;
    object-fit: cover;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.courseDetail_1 .duration-badge {
    background-color: rgba(108, 141, 240, 0.31);
    color: var(--primary);
    padding: 5px 10px;
    border-radius: 20px;
    font-weight: 600;
}

.courseDetail_1 .price-tag {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--secondary);
}

.courseDetail_1 .course-title {
    color: var(--primary);
    font-weight: 700;
}

.courseDetail_1 .instructor-img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--primary);
}

@media (max-width: 768px) {
    .courseDetail_1 .course-img {
        height: 300px;
    }

    .courseDetail_1 .sidebar {
        margin-bottom: 30px;
    }
}