:root {
            --primary-color: #6C63FF;
            --secondary-color: #4A44C6;
            --accent-color: #FF6584;
            --success-color: #4CAF50;
            --text-color: #2D3748;
            --text-light: #718096;
            --bg-color: #F7FAFC;
            --card-bg: #FFFFFF;
            --border-color: #E2E8F0;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --radius: 16px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --header-height: 70px;
        }

        .dark-mode {
            --primary-color: #8B85FF;
            --secondary-color: #6C63FF;
            --accent-color: #FF7B9C;
            --success-color: #66BB6A;
            --text-color: #E2E8F0;
            --text-light: #A0AEC0;
            --bg-color: #1A202C;
            --card-bg: #2D3748;
            --border-color: #4A5568;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
        }

       
        /* Course Hero Section */
        .course-hero {
            padding: 30px 0;
            margin-bottom: 20px;
        }

        .course-hero-content {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        @media (min-width: 768px) {
            .course-hero-content {
                flex-direction: row;
            }
        }

        .course-main {
            flex: 2;
        }

        .course-sidebar {
            flex: 1;
        }

        .course-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .course-description {
            font-size: 16px;
            color: var(--text-light);
            margin-bottom: 20px;
        }

        .course-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-bottom: 20px;
        }

        .meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-light);
        }

        .meta-icon {
            color: var(--primary-color);
        }

        .course-image {
            width: 100%;
            height: 200px;
            border-radius: var(--radius);
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 48px;
            margin-bottom: 20px;
            overflow: hidden;
        }

        @media (min-width: 768px) {
            .course-image {
                height: 300px;
            }
        }

        .course-video-preview {
            width: 100%;
            height: 200px;
            border-radius: var(--radius);
            background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 48px;
            margin-bottom: 20px;
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }

        .video-play-btn {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 60px;
            height: 60px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-color);
            font-size: 24px;
            transition: var(--transition);
        }

        .course-video-preview:hover .video-play-btn {
            background: white;
            transform: translate(-50%, -50%) scale(1.1);
        }

        /* Enrollment Card */
        .enrollment-card {
            background-color: var(--card-bg);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
            margin-bottom: 20px;
            position: sticky;
            top: 90px;
        }

        .course-price {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 10px;
        }

        .price-note {
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 20px;
        }

        .enroll-btn {
            display: block;
            width: 100%;
            padding: 15px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            margin-bottom: 15px;
            text-align: center;
            text-decoration: none;
        }

        .enroll-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(108, 99, 255, 0.3);
        }

        .course-features {
            list-style: none;
            margin-top: 20px;
        }

        .course-features li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 10px;
            color:#6c757d;
        }

        .course-features li:last-child {
            border-bottom: none;
        }

        .feature-icon {
            color: var(--success-color);
        }

        /* Tabs Navigation */
        .tabs-container {
            margin-bottom: 30px;
        }

        .tabs {
            display: flex;
            overflow-x: auto;
            background-color: var(--card-bg);
            border-radius: var(--radius);
            padding: 8px;
            box-shadow: var(--shadow);
            margin-bottom: 20px;
            gap: 5px;
        }

        .tab {
            padding: 12px 20px;
            background: none;
            border: none;
            border-radius: 30px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .tab.active {
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: white;
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
            animation: fadeIn 0.5s ease;
            width:100%;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        /* Section Styles */
        .section {
            margin-bottom: 30px;
            width: 100%;
        }
        
        .selected-rating
        {
            color: #b964bf;
        }

        .section-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
            position: relative;
            display: inline-block;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -5px;
            right: 0;
            width: 40px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }

        /* Curriculum Section */
        .curriculum-list {
            background-color: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        .curriculum-item {
            border-bottom: 1px solid var(--border-color);
        }

        .curriculum-item:last-child {
            border-bottom: none;
        }

        .curriculum-header {
            padding: 16px 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            transition: var(--transition);
        }

        .curriculum-header:hover {
            background-color: var(--bg-color);
        }

        .curriculum-title {
                font-size: 15px;
                font-weight: 600;
                display: flex;
                align-items: center;
                gap: 10px;
                color: #555;
        }

        .curriculum-icon {
            color: var(--primary-color);
        }

        .curriculum-info {
            display: flex;
            align-items: center;
            gap: 15px;
            font-size: 14px;
            color: var(--text-light);
        }

        .curriculum-content {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .curriculum-item.active .curriculum-content {
            max-height: 1000px;
            padding-bottom: 20px;
        }

        .lesson-list {
            list-style: none;
        }

        .lesson-item {
            padding: 12px 0;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .lesson-item:last-child {
            border-bottom: none;
        }

        .lesson-title {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: #6c757d;
        }

        .lesson-icon {
            color: var(--text-light);
        }

        .lesson-duration {
            font-size: 12px;
            color: var(--text-light);
        }

        /* Instructor Section */
        .instructor-card {
            background-color: var(--card-bg);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
            display: flex;
            gap: 20px;
            align-items: center;
        }

        .instructor-avatar {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 30px;
            flex-shrink: 0;
        }

        .instructor-info {
            flex: 1;
        }

        .instructor-name {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 5px;
        }

        .instructor-title {
            font-size: 14px;
            color: var(--primary-color);
            margin-bottom: 10px;
        }

        .instructor-bio {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
        }

        /* Reviews Section */
        .reviews-summary {
            background-color: var(--card-bg);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
            margin-bottom: 20px;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        @media (min-width: 768px) {
            .reviews-summary {
                flex-direction: row;
                align-items: center;
            }
        }

        .rating-overview {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
            flex: 1;
        }

        .average-rating {
            font-size: 36px;
            font-weight: 700;
            color: var(--primary-color);
        }

        .rating-stars {
            color: #FFC107;
            font-size: 18px;
        }

        .rating-count {
            font-size: 14px;
            color: var(--text-light);
        }

        .rating-bars {
            flex: 2;
        }

        .rating-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 8px;
        }

        .rating-label {
            font-size: 14px;
            width: 80px;
            color: rgba(0, 0, 0, .5);
        }

        .rating-progress {
            flex: 1;
            height: 8px;
            background-color: var(--border-color);
            border-radius: 4px;
            overflow: hidden;
        }

        .rating-progress-fill {
            height: 100%;
            background-color: #FFC107;
            border-radius: 4px;
        }

        .reviews-list {
            background-color: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        .review-card {
            padding: 20px;
            border-bottom: 1px solid var(--border-color);
        }

        .review-card:last-child {
            border-bottom: none;
        }

        .review-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
        }

        .reviewer {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .reviewer-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 16px;
        }

        .reviewer-info {
            display: flex;
            flex-direction: column;
        }

        .reviewer-name {
            font-size: 14px;
            font-weight: 600;
            color: #495057;
        }

        .review-date {
            font-size: 12px;
            color: var(--text-light);
        }

        .review-rating {
            color: #FFC107;
        }

        .review-content {
            font-size: 14px;
            line-height: 1.6;
            margin-bottom: 10px;
            color: #6c757d;
        }

        .review-actions {
            display: flex;
            gap: 15px;
        }

        .review-action {
            background: none;
            border: none;
            font-size: 12px;
            color: var(--text-light);
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 5px;
            transition: var(--transition);
        }

        .review-action:hover {
            color: var(--primary-color);
        }

        /* Add Review Form */
        .add-review {
            background-color: var(--card-bg);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
            margin-top: 20px;
        }

        .add-review-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .rating-input {
            margin-bottom: 2px;
        }

        .rating-stars-input {
            display: flex;
            gap: 5px;
            direction: ltr;
            margin-bottom: 10px;
        }

        .rating-star {
            font-size: 24px;
            color: #E2E8F0;
            cursor: pointer;
            transition: var(--transition);
        }

        .rating-star.active, .rating-star:hover {
            color: #FFC107;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
            margin-bottom: 15px;
        }

        .form-label {
            font-size: 14px;
            font-weight: 500;
            color: #666;
        }

        .form-input, .form-textarea {
            padding: 12px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            background-color: var(--bg-color);
            color: var(--text-color);
            font-size: 14px;
            transition: var(--transition);
        }

        .form-input:focus, .form-textarea:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.1);
        }

        .form-textarea {
            min-height: 120px;
            resize: vertical;
        }

        .submit-btn {
            padding: 12px 24px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }

        .submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(108, 99, 255, 0.3);
        }

        /* Related Courses */
        .courses-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
        }

        .course-card {
            background-color: var(--card-bg);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            cursor: pointer;
        }

        .course-card:hover {
            transform: translateY(-5px);
        }

        .course-card-image {
            height: 140px;
            width: 100%;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 32px;
        }

        .course-card-content {
            padding: 15px;
        }

        .course-card-title {
            font-size: 16px;
            margin-bottom: 8px;
            font-weight: 600;
            line-height: 1.4;
        }

        .course-card-info {
            display: flex;
            justify-content: space-between;
            font-size: 12px;
            color: var(--text-light);
            margin-bottom: 10px;
        }

        .course-card-price {
            font-weight: 700;
            color: var(--primary-color);
        }

        /* Responsive Design */
        @media (min-width: 768px) {
            .container {
                max-width: 750px;
                padding: 0 20px;
            }
        }

        @media (min-width: 992px) {
            .container {
                max-width: 970px;
            }
        }

        @media (min-width: 1200px) {
            .container {
                max-width: 1140px;
            }
        }