/* Reset dan Base Styles */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #0d1525 0%, #1a237e 100%);
            color: #fff;
            line-height: 1.6;
            min-height: 100vh;
            padding-bottom: 60px; /* Space for bottom nav */
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        /* ===== DESKTOP STYLES ===== */
        .desktop-only {
            display: block;
        }

        .mobile-only {
            display: none;
        }

        /* Desktop Header */
        .desktop-header {
            background: linear-gradient(135deg, #1a237e 0%, #0d47a1 100%);
            /*padding: 15px 0;*/
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
            top: 0;
            z-index: 100;
        }
        
        .header-top-desktop {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 10px;
        }
        
        .logo-desktop {
            font-size: 28px;
            font-weight: 800;
            color: #ffd700;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }
        
        .logo-desktop span {
            color: #fff;
        }
        
        .search-box-desktop {
            display: flex;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 30px;
            padding: 8px 15px;
            width: 300px;
        }
        
        .search-box-desktop input {
            background: transparent;
            border: none;
            color: #fff;
            width: 100%;
            padding: 5px;
            outline: none;
        }
        
        .search-box-desktop input::placeholder {
            color: rgba(255, 255, 255, 0.7);
        }
        
        .nav-menu-desktop {
            display: flex;
            list-style: none;
            justify-content: center;
            flex-wrap: wrap;
            gap: 5px;
        }
        
        .nav-menu-desktop li {
            margin: 0 5px;
        }
        
        .nav-menu-desktop a {
            color: #fff;
            text-decoration: none;
            font-weight: 500;
            padding: 8px 15px;
            border-radius: 4px;
            font-size: 14px;
            transition: background 0.3s;
            white-space: nowrap;
        }
        
        .nav-menu-desktop a:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        /* Desktop Hero Section */
        .hero-desktop {
            padding: 60px 0;
            text-align: center;
            background: linear-gradient(rgba(13, 21, 37, 0.9), rgba(26, 35, 126, 0.8));
        }
        
        .hero-title-desktop {
            font-size: 2.5rem;
            font-weight: 700;
            color: #ffd700;
            margin-bottom: 20px;
            line-height: 1.3;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        
        .author-desktop {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 30px;
            gap: 15px;
        }
        
        .author-avatar-desktop {
            width: 50px;
            height: 50px;
            background: #ffd700;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: #1a237e;
            font-size: 18px;
        }
        
        .author-info-desktop {
            text-align: left;
        }
        
        .author-name-desktop {
            font-weight: 600;
            font-size: 16px;
        }
        
        .sales-desktop {
            color: #ffd700;
            font-size: 14px;
        }
        
        .hero-description-desktop {
            font-size: 1.2rem;
            color: #e0e0e0;
            margin-bottom: 30px;
            line-height: 1.6;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }
        
        /* Desktop Action Buttons */
        .action-buttons-desktop {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin: 30px 0;
        }
        
        .btn-desktop {
            padding: 15px 30px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            text-align: center;
            font-size: 16px;
            transition: all 0.3s;
            min-width: 150px;
        }
        
        .btn-login-desktop {
            background: rgba(255,255,255,0.1);
            color: #fff;
            border: 2px solid rgba(255,255,255,0.3);
        }
        
        .btn-register-desktop {
            background: linear-gradient(135deg, #ffd700 0%, #ff9800 100%);
            color: #1a237e;
            border: none;
        }
        
        .btn-desktop:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }

        /* Desktop Main Content */
        .main-content-desktop {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 30px;
            margin: 40px 0;
        }

        /* Desktop Tabs */
        .tabs-desktop {
            display: flex;
            background: #1a237e;
            border-radius: 10px 10px 0 0;
            overflow: hidden;
        }
        
        .tab-desktop {
            padding: 20px 30px;
            cursor: pointer;
            font-weight: 500;
            font-size: 16px;
            border-bottom: 3px solid transparent;
            transition: all 0.3s;
            flex: 1;
            text-align: center;
        }
        
        .tab-desktop.active {
            border-bottom-color: #ffd700;
            color: #ffd700;
            background: rgba(255,215,0,0.1);
        }

        /* Desktop Content Section */
        .content-section-desktop {
            background: rgba(30, 41, 59, 0.8);
            padding: 30px;
            border-radius: 0 0 10px 10px;
            margin-bottom: 30px;
        }
        
        .section-title-desktop {
            font-size: 24px;
            color: #ffd700;
            margin-bottom: 20px;
        }
        
        .content-text-desktop {
            font-size: 16px;
            line-height: 1.7;
            color: #e0e0e0;
            margin-bottom: 20px;
        }
        
        .features-list-desktop {
            list-style: none;
            margin: 20px 0;
        }
        
        .features-list-desktop li {
            padding: 10px 0;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            font-size: 16px;
        }
        
        .features-list-desktop li:before {
            content: "✓";
            color: #ffd700;
            margin-right: 15px;
            font-weight: bold;
            font-size: 18px;
        }

        /* Desktop Product Card */
        .product-card-desktop {
            background: rgba(30, 41, 59, 0.9);
            border-radius: 15px;
            padding: 30px;
            border: 2px solid rgba(255,215,0,0.3);
            position: sticky;
            top: 100px;
        }
        
        .rating-desktop {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
            gap: 10px;
        }
        
        .stars-desktop {
            color: #ffd700;
            font-size: 20px;
        }
        
        .rating-value-desktop {
            font-weight: 600;
            font-size: 18px;
        }
        
        .rating-count-desktop {
            color: #94a3b8;
            font-size: 14px;
        }
        
        .license-desktop {
            background: rgba(15, 23, 42, 0.8);
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 20px;
        }
        
        .license-header-desktop {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
        }
        
        .license-title-desktop {
            font-weight: 600;
            font-size: 18px;
        }
        
        .license-price-desktop {
            font-size: 28px;
            font-weight: 700;
            color: #ffd700;
        }
        
        .license-desc-desktop {
            font-size: 14px;
            color: #94a3b8;
        }
        
        .extend-support-desktop {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: rgba(30, 41, 59, 0.6);
            padding: 15px 20px;
            border-radius: 10px;
            margin-bottom: 20px;
            font-size: 14px;
        }
        
        .extend-price-desktop {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .original-price-desktop {
            text-decoration: line-through;
            color: #94a3b8;
        }
        
        .discount-price-desktop {
            color: #ffd700;
            font-weight: 700;
        }
        
        .add-to-cart-desktop {
            background: linear-gradient(135deg, #ffd700 0%, #ff9800 100%);
            color: #1a237e;
            border: none;
            padding: 18px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 18px;
            cursor: pointer;
            width: 100%;
            transition: all 0.3s;
        }
        
        .add-to-cart-desktop:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(255,215,0,0.4);
        }

        /* Desktop Footer */
        .footer-desktop {
            background: rgba(13, 19, 33, 0.9);
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        
        .footer-content-desktop {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-column-desktop h3 {
            color: #ffd700;
            margin-bottom: 20px;
            font-size: 18px;
        }
        
        .footer-links-desktop {
            list-style: none;
        }
        
        .footer-links-desktop li {
            margin-bottom: 10px;
        }
        
        .footer-links-desktop a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.3s;
            font-size: 14px;
        }
        
        .footer-links-desktop a:hover {
            color: #ffd700;
        }
        
        .copyright-desktop {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #94a3b8;
            font-size: 14px;
        }

        /* ===== MOBILE STYLES ===== */
        @media (max-width: 768px) {
            .desktop-only {
                display: none !important;
            }
            
            .mobile-only {
                display: block !important;
            }

            /* Mobile Header */
            .mobile-header {
                background: linear-gradient(135deg, #1a237e 0%, #0d47a1 100%);
                padding: 12px 0;
                position: sticky;
                top: 0;
                z-index: 100;
                box-shadow: 0 2px 10px rgba(0,0,0,0.3);
            }
            
            .header-top-mobile {
                display: flex;
                justify-content: space-between;
                align-items: center;
            }
            
            .logo-mobile {
                font-size: 18px;
                font-weight: 800;
                color: #ffd700;
                text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
            }
            
            .logo-mobile span {
                color: #fff;
                font-size: 14px;
            }
            
            .mobile-menu-btn {
                background: none;
                border: none;
                color: #fff;
                font-size: 20px;
                cursor: pointer;
                padding: 5px;
            }

            /* Mobile Navigation Sidebar */
            .mobile-nav {
                background: rgba(26, 35, 126, 0.95);
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100vh;
                z-index: 1000;
                transform: translateX(-100%);
                transition: transform 0.3s ease;
                padding: 20px;
            }
            
            .mobile-nav.active {
                transform: translateX(0);
            }
            
            .mobile-nav-header {
                display: flex;
                justify-content: space-between;
                align-items: center;
                margin-bottom: 30px;
                padding-bottom: 15px;
                border-bottom: 1px solid rgba(255,255,255,0.2);
            }
            
            .mobile-nav-close {
                background: none;
                border: none;
                color: #fff;
                font-size: 24px;
                cursor: pointer;
            }
            
            .mobile-nav-menu {
                list-style: none;
            }
            
            .mobile-nav-menu li {
                margin-bottom: 15px;
            }
            
            .mobile-nav-menu a {
                color: #fff;
                text-decoration: none;
                font-size: 16px;
                padding: 12px 15px;
                display: block;
                border-radius: 8px;
                background: rgba(255,255,255,0.1);
                transition: background 0.3s;
            }

            /* Hero Section Mobile */
            .hero-mobile {
                padding: 30px 0;
                text-align: center;
                background: linear-gradient(rgba(13, 21, 37, 0.9), rgba(26, 35, 126, 0.8));
            }
            
            .hero-title-mobile {
                font-size: 22px;
                font-weight: 700;
                color: #ffd700;
                margin-bottom: 15px;
                line-height: 1.3;
                text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
            }
            
            .author-mobile {
                display: flex;
                align-items: center;
                justify-content: center;
                margin-bottom: 20px;
                gap: 10px;
            }
            
            .author-avatar-mobile {
                width: 35px;
                height: 35px;
                background: #ffd700;
                border-radius: 50%;
                display: flex;
                align-items: center;
                justify-content: center;
                font-weight: bold;
                color: #1a237e;
                font-size: 14px;
            }
            
            .author-info-mobile {
                text-align: left;
            }
            
            .author-name-mobile {
                font-weight: 600;
                font-size: 14px;
            }
            
            .sales-mobile {
                color: #ffd700;
                font-size: 12px;
            }
            
            .hero-description-mobile {
                font-size: 14px;
                color: #e0e0e0;
                margin-bottom: 25px;
                line-height: 1.5;
            }

            /* Action Buttons Mobile */
            .action-buttons-mobile {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 10px;
                margin: 20px 0;
            }
            
            .btn-mobile {
                padding: 12px 15px;
                border-radius: 25px;
                font-weight: 600;
                text-decoration: none;
                text-align: center;
                font-size: 14px;
                transition: all 0.3s;
            }
            
            .btn-login-mobile {
                background: rgba(255,255,255,0.1);
                color: #fff;
                border: 1px solid rgba(255,255,255,0.3);
            }
            
            .btn-register-mobile {
                background: linear-gradient(135deg, #ffd700 0%, #ff9800 100%);
                color: #1a237e;
                border: none;
            }

            /* Tabs Mobile */
            .tabs-mobile {
                display: flex;
                background: #1a237e;
                border-radius: 10px 10px 0 0;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                scrollbar-width: none;
                margin-top: 20px;
            }
            
            .tabs-mobile::-webkit-scrollbar {
                display: none;
            }
            
            .tab-mobile {
                padding: 15px 20px;
                white-space: nowrap;
                font-weight: 500;
                font-size: 14px;
                border-bottom: 3px solid transparent;
            }
            
            .tab-mobile.active {
                border-bottom-color: #ffd700;
                color: #ffd700;
            }

            /* Content Sections Mobile */
            .content-section {
                background: rgba(30, 41, 59, 0.8);
                padding: 20px;
                border-radius: 0 0 10px 10px;
                margin-bottom: 20px;
            }
            
            .section-title {
                font-size: 18px;
                color: #ffd700;
                margin-bottom: 15px;
            }
            
            .content-text {
                font-size: 14px;
                line-height: 1.6;
                color: #e0e0e0;
                margin-bottom: 15px;
            }
            
            .features-list {
                list-style: none;
                margin: 15px 0;
            }
            
            .features-list li {
                padding: 8px 0;
                border-bottom: 1px solid rgba(255,255,255,0.1);
                font-size: 14px;
            }
            
            .features-list li:before {
                content: "✓";
                color: #ffd700;
                margin-right: 10px;
                font-weight: bold;
            }

            /* Product Card Mobile */
            .product-card-mobile {
                background: rgba(30, 41, 59, 0.9);
                border-radius: 12px;
                padding: 20px;
                margin: 20px 0;
                border: 1px solid rgba(255,215,0,0.3);
            }
            
            .rating-mobile {
                display: flex;
                align-items: center;
                margin-bottom: 15px;
                gap: 8px;
            }
            
            .stars-mobile {
                color: #ffd700;
                font-size: 16px;
            }
            
            .rating-value-mobile {
                font-weight: 600;
                font-size: 14px;
            }
            
            .rating-count-mobile {
                color: #94a3b8;
                font-size: 12px;
            }
            
            .license-mobile {
                background: rgba(15, 23, 42, 0.8);
                padding: 15px;
                border-radius: 8px;
                margin-bottom: 15px;
            }
            
            .license-header-mobile {
                display: flex;
                justify-content: space-between;
                align-items: center;
                margin-bottom: 10px;
            }
            
            .license-title-mobile {
                font-weight: 600;
                font-size: 16px;
            }
            
            .license-price-mobile {
                font-size: 20px;
                font-weight: 700;
                color: #ffd700;
            }
            
            .license-desc-mobile {
                font-size: 13px;
                color: #94a3b8;
            }
            
            .extend-support-mobile {
                display: flex;
                justify-content: space-between;
                align-items: center;
                background: rgba(30, 41, 59, 0.6);
                padding: 12px 15px;
                border-radius: 8px;
                margin-bottom: 15px;
                font-size: 13px;
            }
            
            .extend-price-mobile {
                display: flex;
                align-items: center;
                gap: 8px;
            }
            
            .original-price-mobile {
                text-decoration: line-through;
                color: #94a3b8;
            }
            
            .discount-price-mobile {
                color: #ffd700;
                font-weight: 700;
            }
            
            .add-to-cart-mobile {
                background: linear-gradient(135deg, #ffd700 0%, #ff9800 100%);
                color: #1a237e;
                border: none;
                padding: 15px;
                border-radius: 25px;
                font-weight: 700;
                font-size: 16px;
                cursor: pointer;
                width: 100%;
                transition: transform 0.3s;
            }
            
            .add-to-cart-mobile:active {
                transform: scale(0.98);
            }

            /* Bottom Navigation Mobile - FIXED */
            .bottom-nav {
                position: fixed;
                bottom: 0;
                left: 0;
                width: 100%;
                background: linear-gradient(135deg, #1a237e 0%, #0d47a1 100%);
                display: flex !important;
                justify-content: space-around;
                align-items: center;
                padding: 10px 0;
                box-shadow: 0 -2px 10px rgba(0,0,0,0.3);
                z-index: 9999;
                border-top: 1px solid rgba(255,255,255,0.2);
            }
            
            .nav-item {
                display: flex;
                flex-direction: column;
                align-items: center;
                text-decoration: none;
                color: #fff;
                font-size: 10px;
                gap: 4px;
                flex: 1;
                min-width: 0;
                padding: 5px 2px;
            }
            
            .nav-item:active {
                transform: scale(0.95);
                background: rgba(255,255,255,0.1);
                border-radius: 8px;
            }
            
            .nav-icon {
                font-size: 18px;
                display: block;
            }
            
            .nav-text {
                font-size: 10px;
                font-weight: 600;
                white-space: nowrap;
                display: block;
            }
        }

        /* Utility Classes */
        .hidden {
            display: none !important;
        }
        
        .text-center {
            text-align: center;
        }
        
        .mb-20 {
            margin-bottom: 20px;
        }
        
        .mt-20 {
            margin-top: 20px;
        }

        .success-message {
            background: #4CAF50;
            color: white;
            padding: 12px;
            border-radius: 8px;
            font-size: 14px;
            margin-top: 15px;
        }
        
        .success {
            background: #4CAF50 !important;
        }