.course-section {
    margin: 20vh 0;
}

.sidebar-menu {
    width: 100%;
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 0 20px 20px 0;
    color: #fff;
    font-size: 20px;
    padding: 20px 0;
}

.sidebar-menu a {
    color: #fff;
    text-decoration: none;
    padding: .5rem;
}

.sidebar-menu a:hover {
    color: #fff !important;
}

.menu-item {
    margin: 10px 20px;
}

.menu-item.active {
    list-style: none;
    margin-right: 50px;
    margin-left: -2rem;
}

.menu-item.active .sidebar-link {
    font-weight: 700;
    font-size: 24px;
    color: var(--primary-color);
    background: #fff;
    border-radius: 0 40px 40px 0;
    margin: revert;
}

.menu-sub-item.active>.sidebar-sub-link {
    font-weight: 600;
    color: var(--primary-color);
    /* đồng nhất với menu chính */
    background-color: #f0f0f0;
    /* nền nhẹ để phân biệt */
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
    border-radius: 0 20px 20px 0;
}

.menu-sub-item.active {
    text-decoration: underline;
}

.menu-item.active a:hover {
    color: var(--primary-color) !important;
}

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

.owl-nav {
    display: none !important;
}

.course-name {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 20px;
    margin-top: 20px;
}

.course-desc {
    font-size: 18px;
    color: #000;
    margin: 10px 0 0 0;
}

.course-sub-desc {
    font-size: 14px;
}

.course-image {
    width: 100%;
    object-fit: cover;
    border-radius: 20px;
    overflow: hidden;
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.3s ease-in-out;
}

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

@media (min-width: 1024px) {
    .collapse {
        height: 100%;
    }
}

@media (max-width: 768px) {
    .sidebar-menu {
        border-radius: 0;
        font-size: 14px;
        overflow-y: auto;
    }
}