:root {
            --primary-color: #e74c3c;
            --dark-gray: #333;
            --medium-gray: #666;
            --light-gray: #f5f5f5;
            --border-color: #ddd;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', Arial, sans-serif;
        }
        
        body {
            background-color: var(--light-gray);
            color: var(--dark-gray);
            line-height: 1.6;
            font-weight: 300;
        }
        
        .background {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            display: flex;
            justify-content: center;
            align-items: center;
            opacity: 0.1;
        }
        
        .background img {
            max-width: 70%;
            max-height: 70%;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            margin-bottom: 40px;
            border-bottom: 1px solid var(--border-color);
        }
        
        .logo {
            max-width: 200px;
        }
        
        .logo-link {
            display: inline-block;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav ul li {
            margin-left: 30px;
        }
        
        nav ul li a {
            text-decoration: none;
            color: var(--dark-gray);
            font-weight: 400;
            transition: color 0.3s;
            padding: 5px 0;
            position: relative;
        }
        
        nav ul li a.active {
            color: var(--primary-color);
        }
        
        nav ul li a.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }
        
        nav ul li a:hover {
            color: var(--primary-color);
        }
        
        .page {
            display: none;
        }
        
        .page.active {
            display: block;
        }
        
        /* Home Page */
        .home-content {
            text-align: center;
            padding: 60px 0;
        }
        
        .home-title {
            font-size: 3rem;
            margin-bottom: 20px;
            color: var(--dark-gray);
            font-weight: 500;
        }
        
        .home-subtitle {
            font-size: 1.5rem;
            margin-bottom: 40px;
            color: var(--medium-gray);
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }
        
        /* Products Page */
        .products-page h1 {
            text-align: center;
            margin: 40px 0;
            font-weight: 500;
        }
        
        .products {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }
        
        .product-card {
            background: white;
            border-radius: 5px;
            overflow: hidden;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s, box-shadow 0.3s;
            border: 1px solid var(--border-color);
        }
        
        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12);
        }
        
        .product-img {
            height: 200px;
            background-color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            border-bottom: 1px solid var(--border-color);
            border-radius: 5px;
        }
        
        .product-img img {
            max-width: 100%;
            max-height: 100%;
            object-fit: cover;
        }
        
        .product-info {
            padding: 25px;
        }
        
        .product-title {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: var(--dark-gray);
            font-weight: 500;
        }
        
        .product-desc {
            color: var(--medium-gray);
            margin-bottom: 20px;
            line-height: 1.6;
        }
        
        /* About Page */
        .about-content {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .about-title {
            font-size: 2.5rem;
            margin-bottom: 30px;
            text-align: center;
            font-weight: 500;
        }
        
        .about-section {
            margin-bottom: 40px;
        }
        
        .about-section h2 {
            margin-bottom: 15px;
            color: var(--dark-gray);
            font-weight: 500;
        }
        
        .about-section p {
            margin-bottom: 15px;
            line-height: 1.7;
        }
        
        .team-member {
            margin-top: 20px;
            padding: 20px;
            background: white;
            border-radius: 5px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }
        
        .team-member h3 {
            margin-bottom: 5px;
            font-weight: 500;
        }
        
        /* Buttons */
        .cta-button, .product-btn, .download-btn {
            border-radius: 0;
            border-top: 2px solid #ffffff;
            border-left: 2px solid #ffffff;
            border-right: 2px solid #888888;
            border-bottom: 2px solid #888888;
            box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
            padding: 10px 25px;
            background-color: #d0d0d0;
            color: #000000;
            font-weight: 500;
            text-decoration: none;
            transition: background-color 0.2s;
            display: inline-block;
            cursor: pointer;
        }
        
        .cta-button:hover, .product-btn:hover, .download-btn:hover {
            background-color: #e0e0e0;
            color: #ffffff;
        }
        
        .cta-button:active, .product-btn:active, .download-btn:active {
            border-top: 2px solid #888888;
            border-left: 2px solid #888888;
            border-right: 2px solid #ffffff;
            border-bottom: 2px solid #ffffff;
            transform: translateY(1px) translateX(1px);
        }
        
        .cta-button {
            font-size: 1.1rem;
            padding: 12px 30px;
        }
        
        .cta-button:hover {
            background-color: var(--primary-color);
        }
        
        .product-btn:hover {
            background-color: var(--primary-color);
        }
        
        .email-link {
            color: #000;
            text-decoration: none; 
            font-weight: 400; 
            position: relative; 
            overflow: hidden; 
        }
        
        .email-link::before {
            content: ''; 
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color); 
            transform: scaleX(0); 
            transform-origin: bottom right;
            transition: transform 0.4s ease; 
        }
        
        .email-link:hover::before {
            transform: scaleX(1); 
            transform-origin: bottom left; 
        }
        
        .email-link:hover {
            color: var(--primary-color); 
            text-decoration: none; 
        }
        
        /* Download Pages */
        .download-page {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            z-index: 1000;
            justify-content: center;
            align-items: flex-start;
            overflow-y: auto;
            padding: 20px 0;
        }
        
        .download-container {
            background-color: #ffffff;
            padding: 30px;
            border-radius: 8px;
            max-width: 800px;
            width: 90%;
            margin: 0 auto;
            position: relative;
            overflow-y: scroll;
            max-height: 90vh;
            box-shadow: 0 5px 25px rgba(0, 0, 0, 0.2);
        }
        
        .close-btn {
            position: absolute;
            top: 15px;
            right: 20px; 
            font-size: 24px;
            cursor: pointer;
            color: #666;
            z-index: 1001;
            background-color: white;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
        }
        
        .close-btn:hover {
            color: var(--primary-color);
            background-color: #f0f0f0; 
        }
        
        .download-title {
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid #eee;
            font-weight: 500;
        }
        
        .download-options {
            margin-top: 20px;
        }
        
        .download-btn {
            margin-right: 15px;
            margin-bottom: 15px;
            font-size: 0.9rem;
        }
        
        .download-btn:hover {
            background-color: var(--primary-color);
        }
        
        .system-requirements {
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid #eee;
        }
        
        .system-requirements h3 {
            margin-bottom: 10px;
            font-weight: 500;
        }
        
        .system-requirements ul {
            margin: 10px 0;
            padding-left: 20px;
        }
        
        .system-requirements ul ul {
            margin: 5px 0;
            padding-left: 20px;
        }
        
        .image-gallery {
            margin: 30px 0;
        }
        
        .gallery-title {
            margin-bottom: 15px;
            font-size: 1.2rem;
            font-weight: 500;
        }
        
        .gallery-container {
            position: relative;
            height: 400px;
            display: block;
            overflow: hidden;
            margin-bottom: 10px;
            border-radius: 4px;
        }
        
        .gallery-image {
            position: relative;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: none;
            object-fit: contain;
            cursor: pointer;
        }
        
        .gallery-thumbnail {
            display: flex;
            overflow-x: auto;
            white-space: nowrap;
            gap: 10px;
            padding-bottom: 10px;
            justify-content: center;
        }
        
        .thumbnail {
            width: 60px;
            height: 40px;
            border-radius: 4px;
            cursor: pointer;
            border: 2px solid transparent;
            object-fit: cover;
            transition: transform 0.2s ease, border-color 0.2s ease;
            flex-shrink: 0;
        }
        
        .thumbnail:hover {
            transform: scale(1.1);
        }
        
        .thumbnail.active {
            border-color: var(--primary-color);
        }
        
        #imageZoomModal {
            display: none;
            position: fixed;
            z-index: 1500;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0, 0, 0, 0.9);
            align-items: center;
            justify-content: center;
        }
        
        #zoomedImage {
            max-width: 90%;
            max-height: 90%;
            display: block;
            margin: auto;
        }
        
        #imageZoomModal .close-btn {
            position: fixed;
            top: 20px;
            right: 30px;
            font-size: 40px;
            font-weight: bold;
            cursor: pointer;
            color: white;
            background-color: rgba(0, 0, 0, 0.8);
            border-radius: 50%;
            width: 50px;
            height: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1501;
        }
        
        #imageZoomModal .close-btn:hover {
            background-color: rgba(255, 255, 255, 0.8);
            color: black;
        }
        
        /* Footer */
        footer {
            text-align: center;
            padding: 40px 0;
            color: var(--medium-gray);
            margin-top: 80px;
            border-top: 1px solid var(--border-color);
        }
        
        /* Back to top button */
        .back-to-top-btn {
            display: none;
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 99;
            border-radius: 20px;
            border: 1px solid #9c9c9c;
            background-color: #e0e0e0;
            color: #000000;
            cursor: pointer;
            width: 50px;
            height: 40px;
            text-align: center;
            box-shadow: 2px 2px 0 #e0e0d5;
            transition: all 0.1s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        
        .back-to-top-btn:hover {
            background-color: #e0e0e0;
        }
        
        .back-to-top-btn:active {
            transform: translateY(2px) translateX(2px);
            box-shadow: 0 0 0 var(--primary-color);
        }
        
        /* Responsive Design */
        @media screen and (max-width: 768px) {
            header {
                flex-direction: column;
                align-items: center;
                padding: 10px 0;
            }
            
            .logo {
                margin-bottom: 15px;
            }
            
            nav ul {
                flex-direction: column;
                align-items: center;
            }
            
            nav ul li {
                margin: 8px 0;
                margin-left: 0;
            }
            
            .home-title {
                font-size: 2rem;
            }
            
            .home-subtitle {
                font-size: 1.2rem;
            }
            
            .products {
                grid-template-columns: 1fr;
            }
            
            .download-container {
                width: 95%;
                padding: 15px;
            }
            
            .gallery-container {
                height: 250px;
            }
            
            .download-options {
                display: flex;
                flex-direction: column;
            }
            
            .download-btn {
                margin-right: 0;
                margin-bottom: 10px;
                text-align: center;
            }
        }
        
        @media screen and (max-width: 480px) {
            .container {
                padding: 10px;
            }
            
            .home-title {
                font-size: 1.8rem;
            }
            
            .home-subtitle {
                font-size: 1rem;
            }
            
            .cta-button {
                font-size: 1rem;
                padding: 10px 20px;
            }
            
            .product-title {
                font-size: 1.3rem;
            }
            
            .about-title {
                font-size: 2rem;
            }
            
            .gallery-container {
                height: 200px;
            }
            
            .thumbnail {
                width: 50px;
                height: 30px;
            }
        }

        .about-section {
            max-width: 900px;
            margin: 0 auto;
            padding: 40px 20px;
            text-align: center;
        }

        .about-section h2 {
            font-size: 2rem;
            margin-bottom: 10px;
        }

        .about-section p {
            margin-bottom: 30px;
            color: #555;
        }

        .about-section .team-container {
            display: flex;
            gap: 40px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .about-section .team-member {
            background: #f9f9f9;
            border-radius: 5px;
            padding: 20px;
            flex: 1 1 250px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }

        .about-section .team-member h3 {
            margin: 0 0 5px;
            font-size: 1.2rem;
        }

        .about-section .team-member p {
            margin: 0;
            font-size: 0.9rem;
            color: #777;
            text-align: left;
        }
 
        @media (min-width: 768px) {
            #backToTopBtn {
                display: none;
            }
        }