:root {
            --primary-bg: #ffffff;
            --secondary-bg: #f8fafd;
            --accent-red: #E03B3B;
            --accent-dark: #1a2639;
            --text-primary: #2d3a4f;
            --text-secondary: #5e6f8d;
            --border-light: #eef2f6;
            --shadow-soft: 0 10px 30px -15px rgba(0,0,0,0.1), 0 5px 15px -10px rgba(224,59,59,0.1);
            --shadow-hover: 0 20px 35px -18px rgba(224,59,59,0.2);
            --transition: all 0.25s ease;
        }

        body {
            font-family: 'Inter', sans-serif;
            background: var(--secondary-bg);
            color: var(--text-primary);
            line-height: 1.5;
        }

        h1, h2, h3, h4, h5 {
            font-family: 'Plus Jakarta Sans', sans-serif;
            font-weight: 600;
            letter-spacing: -0.02em;
        }

        /* --- Clean Header --- */
        .course-header {
            background: linear-gradient(115deg, #1a2639 0%, #2c3a55 100%);
            padding: 200px 0 100px;
            position: relative;
            margin-bottom: -50px;
        }
        @keyframes flicker {
            0% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.8; transform: scale(1.1); }
            100% { opacity: 1; transform: scale(1); }
        }

        .header-badge {
            background: rgba(224,59,59,0.15);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(224,59,59,0.3);
            color: white;
            padding: 5px 16px;
            border-radius: 40px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 20px;
        }

        .header-badge i {
            color: var(--accent-red);
            font-size: 0.75rem;
        }

        .course-header h1 {
            color: white;
            font-size: 2.8rem;
            font-weight: 700;
            margin-bottom: 15px;
            line-height: 1.2;
        }

        .course-header .lead {
            color: rgba(255,255,255,0.85);
            font-size: 1.1rem;
            max-width: 600px;
            margin-bottom: 25px;
        }

        .header-meta {
            display: flex;
            gap: 25px;
            color: rgba(255,255,255,0.8);
            font-size: 0.95rem;
        }

        .header-meta i {
            color: var(--accent-red);
            margin-right: 6px;
        }

        /* --- Main Content Area --- */
        .content-wrapper {
            position: relative;
            z-index: 10;
            padding-bottom: 60px;
        }

        /* Left Column Cards */
        .card-modern {
            background: white;
            border-radius: 24px;
            padding: 28px;
            margin-bottom: 24px;
            box-shadow: var(--shadow-soft);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }

        .card-modern:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .card-label {
            display: inline-block;
            background: var(--accent-dark);
            color: white;
            padding: 4px 14px;
            border-radius: 30px;
            font-size: 0.7rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 18px;
        }

        .card-title {
            font-size: 1.5rem;
            color: var(--accent-dark);
            margin-bottom: 18px;
            font-weight: 700;
        }

        /* Video Container */
        .video-box {
            border-radius: 18px;
            overflow: hidden;
            box-shadow: 0 12px 25px -15px var(--accent-red);
            margin-bottom: 20px;
            border: 1px solid rgba(224,59,59,0.2);
        }

        /* Feature Grid */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
            margin: 20px 0;
        }

        .feature-item {
            background: var(--secondary-bg);
            padding: 20px 16px;
            border-radius: 18px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }

        .feature-item:hover {
            background: white;
            border-color: var(--accent-red);
        }

        .feature-item i {
            color: var(--accent-red);
            font-size: 1.3rem;
            margin-bottom: 10px;
            background: white;
            padding: 8px;
            border-radius: 14px;
            box-shadow: 0 5px 12px -8px var(--accent-red);
        }

        .feature-item h5 {
            font-size: 1rem;
            margin-bottom: 4px;
        }

        .feature-item p {
            font-size: 0.8rem;
            color: var(--text-secondary);
            margin: 0;
        }

        /* Demo Grid */
        .demo-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 18px;
        }

        .demo-card {
            background: var(--secondary-bg);
            border-radius: 16px;
            overflow: hidden;
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }

        .demo-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-red);
        }

        .demo-card .ratio {
            border-bottom: 2px solid var(--accent-red);
        }

        .demo-card p {
            padding: 12px;
            font-weight: 500;
            font-size: 0.9rem;
            margin: 0;
            color: var(--accent-dark);
        }

        /* Images */
        .img-modern {
            border-radius: 18px;
            border: 1px solid var(--border-light);
            width: 100%;
            transition: var(--transition);
        }

        .img-modern:hover {
            border-color: var(--accent-red);
        }

        /* --- Right Sidebar - Enrollment Card --- */
        .enroll-sidebar {
            position: sticky;
            top: 90px;
        }

        .enroll-card {
            background: white;
            border-radius: 28px;
            padding: 28px;
            box-shadow: 0 20px 40px -20px rgba(0,0,0,0.2);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }

        .enroll-card:hover {
            box-shadow: 0 25px 45px -22px var(--accent-red);
        }

        .enroll-badge {
            background: var(--accent-red);
            color: white;
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 15px;
        }

        .enroll-card h3 {
            font-size: 1.6rem;
            color: var(--accent-dark);
            margin-bottom: 5px;
        }

        .price-section {
            margin: 20px 0 25px;
            display: flex;
            align-items: baseline;
            gap: 12px;
            flex-wrap: wrap;
        }

        .current-price {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--accent-dark);
        }

        .old-price {
            text-decoration: line-through;
            color: var(--text-secondary);
            font-size: 1.1rem;
        }

        .discount {
            background: #fee9e9;
            color: var(--accent-red);
            padding: 3px 10px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
        }

        .btn-enroll {
            background: var(--accent-red);
            color: white;
            width: 100%;
            padding: 14px;
            border-radius: 60px;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            margin-bottom: 12px;
            transition: var(--transition);
        }

        .btn-enroll:hover {
            background: var(--accent-dark);
            color: white;
            transform: translateY(-2px);
        }

        .btn-scholar {
            background: transparent;
            color: var(--accent-dark);
            width: 100%;
            padding: 12px;
            border-radius: 60px;
            font-weight: 500;
            border: 2px solid var(--accent-dark);
            display: block;
            text-align: center;
            text-decoration: none;
            font-size: 0.95rem;
            transition: var(--transition);
            margin-bottom: 20px;
        }

        .btn-scholar:hover {
            background: var(--accent-dark);
            color: white;
        }

        .feature-list {
            list-style: none;
            padding: 0;
            margin: 20px 0;
        }

        .feature-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
            color: var(--text-primary);
            font-size: 0.95rem;
        }

        .feature-list i {
            color: var(--accent-red);
            font-size: 0.9rem;
            width: 18px;
        }

        .contact-box {
            background: var(--secondary-bg);
            border-radius: 18px;
            padding: 16px;
            text-align: center;
            border: 1px solid var(--border-light);
        }

        .contact-box small {
            color: var(--text-secondary);
            font-size: 0.75rem;
        }

        .contact-box a {
            color: var(--accent-dark);
            font-size: 1.1rem;
            font-weight: 600;
            text-decoration: none;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin-top: 5px;
        }

        .contact-box i {
            color: var(--accent-red);
            font-size: 1rem;
        }

        /* FAQ Accordion */
        .accordion-modern {
            background: white;
            border-radius: 20px;
            overflow: hidden;
        }

        .accordion-item {
            border: none;
            border-bottom: 1px solid var(--border-light);
        }

        .accordion-button {
            padding: 18px 20px;
            font-weight: 600;
            color: var(--accent-dark);
            background: white;
        }

        .accordion-button:not(.collapsed) {
            background: var(--secondary-bg);
            color: var(--accent-red);
        }

        .accordion-button:focus {
            box-shadow: none;
        }

        .accordion-body {
            padding: 18px 20px;
            color: var(--text-secondary);
            background: white;
        }

        /* Responsive */
        @media (max-width: 991px) {
            .course-header h1 {
                font-size: 2.2rem;
            }
            
            .enroll-sidebar {
                position: static;
                margin-top: 30px;
            }
            
            .features-grid {
                grid-template-columns: 1fr;
            }
            
            .demo-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 576px) {
            .card-modern {
                padding: 20px;
            }
            
            .course-header {
                padding: 60px 0 80px;
            }
        }