.course-single-header {
    background: linear-gradient(135deg, #dbeafe 0%, #ffffff 100%);
}
.course-single-cover {
    transition: transform 0.3s ease;
}
.course-single-cover:hover {
    transform: scale(1.02);
}
.course-single-title {
    color: #1e293b;
    line-height: 1.3;
}
.course-single-meta-badge {
    background-color: #dbeafe;
    color: #2563eb;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
}
.course-single-status-badge {
    background-color: #10b981;
    color: white;
}
.course-single-description {
    background-color: #f8fafc;
    border-left: 4px solid #2563eb;
}
.course-single-section-card {
    background: white;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    border: none;
    overflow: hidden;
}
.course-single-section-icon {
    width: 40px;
    height: 40px;
    background-color: #dbeafe;
    color: #2563eb;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.course-single-section-title {
    margin: 0;
    color: #1e293b;
}
.course-single-chapter-item {
    border: 1px solid #e2e8f0;
    overflow: hidden;
}
.course-single-chapter-header {
    background-color: #f8fafc;
    cursor: pointer;
}
.course-single-chapter-number {
    width: 36px;
    height: 36px;
    background-color: #2563eb;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}
.course-single-chapter-title {
    margin: 0;
}
.course-single-chapter-meta {
    color: #64748b;
    font-size: 0.9rem;
}
.course-single-video-thumbnail {
    width: 120px;
    height: 68px;
    object-fit: cover;
    background-color: #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #64748b;
}
.course-single-video-title {
    font-weight: 600;
}
.course-single-video-description {
    color: #64748b;
    font-size: 0.9rem;
}
.course-single-video-meta {
    font-size: 0.85rem;
    color: #64748b;
}

.course-single-access-badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}
.course-single-access-free {
    background-color: #ecfdf5;
    color: #047857;
}
.course-single-access-users {
    background-color: #eff6ff;
    color: #1d4ed8;
}
.course-single-access-vip {
    background-color: #fef3c7;
    color: #b45309;
}
.course-single-play-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: #2563eb;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    border: none;
}
.course-single-play-btn:hover {
    transform: scale(1.05);
    background-color: #1e40af;
}
@media (max-width: 768px) {
    .course-single-video-thumbnail {
        width: 100%;
        height: auto;
        aspect-ratio: 16/9;
    }

    .course-single-meta-badge {
        font-size: 0.75rem;
    }
}