* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary: #818cf8;
            --primary-light: #a5b4fc;
            --secondary: #22d3ee;
            --accent: #fbbf24;
            --dark: #f3f4f6;
            --text: #e5e7eb;
            --text-light: #9ca3af;
            --bg: #111827;
            --bg-light: #1f2937;
            --bg-accent: #374151;
            --border: #374151;
            --sidebar-bg: #1f2937;
            --success: #34d399;
        }

        body {
            font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            overflow-x: hidden;
        }

        /* Header & Navigation */
        header {
            background: rgba(17, 24, 39, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border);
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
        }

        nav {
            max-width: 1600px;
            margin: 0 auto;
            padding: 0 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            min-height: 75px;
        }

        .logo {
            font-family: 'Poppins', sans-serif;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            letter-spacing: -0.5px;
        }

        .mobile-menu-btn {
            display: none;
            background: var(--primary);
            border: none;
            padding: 10px 20px;
            border-radius: 6px;
            font-size: 0.9rem;
            cursor: pointer;
            color: white;
            font-weight: 600;
        }

        /* Sidebar Navigation */
        .sidebar {
            position: fixed;
            top: 75px;
            left: 0;
            width: 280px;
            height: calc(100vh - 75px);
            background: var(--sidebar-bg);
            border-right: 1px solid var(--border);
            overflow-y: auto;
            padding: 30px 0;
            z-index: 900;
            box-shadow: 2px 0 15px rgba(0, 0, 0, 0.4);
        }

        .sidebar-nav {
            list-style: none;
        }

        .sidebar-nav > li {
            margin-bottom: 5px;
        }

        .sidebar-nav a {
            display: block;
            padding: 12px 30px;
            color: var(--text);
            text-decoration: none;
            font-weight: 500;
            font-size: 0.95rem;
            transition: all 0.3s;
            border-left: 3px solid transparent;
        }

        .sidebar-nav > li > a {
            font-weight: 600;
        }

        .sidebar-nav a:hover,
        .sidebar-nav a.active {
            color: var(--primary);
            background: var(--bg-light);
            border-left-color: var(--primary);
        }

        .sidebar-nav .has-submenu > a {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .sidebar-nav .has-submenu > a::after {
            content: '▸';
            transition: transform 0.3s;
            font-size: 0.8rem;
        }

        .sidebar-nav .has-submenu.open > a::after {
            transform: rotate(90deg);
        }

        .submenu {
            list-style: none;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }

        .submenu.open {
            max-height: 500px;
        }

        .submenu a {
            padding: 10px 30px 10px 50px;
            font-size: 0.9rem;
            font-weight: 400;
            color: var(--text-light);
        }
        
        .experiment {
            padding-left: 20px;
            list-style: none;
        }

        .submenu a:hover,
        .submenu a.active {
            color: var(--primary);
            background: var(--bg-light);
        }
        .download a{
            color: var(--primary);
            background: var(--bg-light);
        }

        /* Main Layout with Sidebar */
        .main-wrapper {
            margin-left: 280px;
            margin-top: 75px;
        }

        /* Hero Section */
        .hero {
            min-height: 70vh;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
            background: linear-gradient(135deg, #1f2937 0%, #111827 50%, #1f2937 100%);
        }

        .hero::before {
            content: '';
            position: absolute;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(129, 140, 248, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            top: -200px;
            right: -200px;
        }

        .hero::after {
            content: '';
            position: absolute;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(34, 211, 238, 0.12) 0%, transparent 70%);
            border-radius: 50%;
            bottom: -150px;
            left: -150px;
        }

        .hero-content {
            max-width: 1000px;
            padding: 0 50px;
            position: relative;
            z-index: 2;
            text-align: center;
        }

         .snippet {
            z-index: 2;
            padding:10px;
            color: var(--text);
            background: grey;
            border-radius: 5px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }

        .hero h1 {
            font-family: 'Poppins', sans-serif;
            font-size: clamp(3rem, 7vw, 5.5rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 1.5rem;
            color: var(--dark);
            animation: fadeInUp 0.8s ease-out;
        }

        .hero h1 span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero h2 {
            font-size: clamp(1.3rem, 3vw, 2rem);
            font-weight: 500;
            color: var(--text-light);
            margin-bottom: 1rem;
            animation: fadeInUp 0.8s ease-out 0.2s both;
        }

        .hero h3 {
            font-size: clamp(1.1rem, 2vw, 1.4rem);
            font-weight: 400;
            color: var(--text);
            max-width: 700px;
            margin: 0 auto;
            padding: 1.5rem 2rem;
            background: gray;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            animation: fadeInUp 0.8s ease-out 0.4s both;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Main Content */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 30px 50px;
        }

        .page-content {
            display: none;
        }

        .page-content.active {
            display: block;
        }

        .section {
            margin-bottom: 60px;
        }

        .section-header {
            margin-bottom: 50px;
            text-align: center;
        }

        .section-title {
            font-family: 'Poppins', sans-serif;
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 1rem;
        }

        .section-title span {
            color: var(--primary);
        }

        .section-subtitle {
            font-size: 1.15rem;
            color: var(--text-light);
            max-width: 650px;
            margin: 0 auto;
        }

        /* About Section */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: start;
        }

        .about-card {
            background: var(--bg-light);
            padding: 45px;
            border-radius: 16px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
            border: 1px solid var(--border);
            transition: all 0.3s;
        }

        .about-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 30px rgba(129, 140, 248, 0.3);
            border-color: var(--primary);
        }

        .about-card h3 {
            font-family: 'Poppins', sans-serif;
            font-size: 1.75rem;
            margin-bottom: 1.5rem;
            color: var(--primary);
            font-weight: 700;
        }

        .about-card h4 {
            font-family: 'Poppins', sans-serif;
            font-size: 1.25rem;
            margin-bottom: 1.25rem;
            color: var(--primary);
            font-weight: 600;
        }

        .about-card p {
            color: var(--text);
            line-height: 1.8;
            margin-bottom: 1.25rem;
            font-size: 0.98rem;
        }

        .about-card strong {
            color: var(--dark);
            font-weight: 600;
        }

        .credentials {
            margin-top: 2rem;
            padding-top: 2rem;
            border-top: 2px solid var(--bg-accent);
        }

        .credential-item {
            display: flex;
            align-items: start;
            margin-bottom: 1rem;
            padding-left: 30px;
            position: relative;
            color: var(--text);
        }

        .credential-item::before {
            content: '🎓';
            position: absolute;
            left: 0;
            font-size: 1.2rem;
        }

        .about-card ul {
            margin-left: 0;
            margin-top: 15px;
            list-style: none;
        }

        .about-card li {
            margin-bottom: 1rem;
            color: var(--text);
            position: relative;
            padding-left: 25px;
        }

        .about-card li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--success);
            font-weight: 700;
        }

        .status-box {
            margin-top: 2rem;
            padding: 20px;
            background: rgba(34, 211, 238, 0.1);
            border-radius: 10px;
            border-left: 4px solid var(--secondary);
        }

        .status-box strong {
            color: var(--secondary);
            display: block;
            margin-bottom: 8px;
        }

        .status-box p {
            color: var(--text);
        }

        /* Products Grid */
        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 50px;
        }

        .product-card {
            background: var(--bg-light);
            padding: 35px;
            border-radius: 14px;
            border: 2px solid var(--border);
            transition: all 0.3s;
            cursor: pointer;
        }

        .product-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 40px rgba(129, 140, 248, 0.3);
            border-color: var(--primary);
            background: var(--bg-accent);
        }

        .product-card h4 {
            font-family: 'Poppins', sans-serif;
            font-size: 1.5rem;
            margin-bottom: 1rem;
            color: var(--primary);
            font-weight: 700;
        }

        .product-card p {
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* Technologies */
        .tech-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 50px;
            justify-content: center;
        }

        .tech-item {
            background: var(--bg-light);
            border: 2px solid var(--border);
            padding: 12px 24px;
            border-radius: 8px;
            font-weight: 600;
            color: var(--text);
            font-size: 0.9rem;
            transition: all 0.3s;
        }

        .tech-item:hover {
            border-color: var(--primary);
            background: var(--primary);
            color: var(--bg);
            transform: translateY(-3px);
            box-shadow: 0 4px 12px rgba(129, 140, 248, 0.4);
        }

        /* Note Box */
        .note-box {
            background: rgba(251, 191, 36, 0.1);
            border-left: 4px solid var(--accent);
            padding: 30px;
            border-radius: 12px;
            margin: 60px 0;
            border: 1px solid rgba(251, 191, 36, 0.2);
        }

        .note-box strong {
            color: var(--accent);
            display: block;
            margin-bottom: 12px;
            font-size: 1.05rem;
            font-weight: 700;
        }

        .note-box p {
            color: #fde68a;
            margin-bottom: 10px;
        }

        /* Footer */
        footer {
            background: var(--bg-light);
            border-top: 1px solid var(--border);
            padding: 50px 30px;
            text-align: center;
        }

        footer p {
            color: var(--text-light);
            font-size: 0.95rem;
        }

        footer p:first-child {
            margin-bottom: 8px;
            color: var(--text);
            font-weight: 600;
        }

        /* Responsive */
        @media (max-width: 968px) {
            nav {
                padding: 0 20px;
            }

            .mobile-menu-btn {
                display: block;
            }

            .sidebar {
                left: -280px;
                transition: left 0.3s;
                box-shadow: 2px 0 15px rgba(0, 0, 0, 0.6);
                background: var(--sidebar-bg);
            }

            .sidebar.mobile-open {
                left: 0;
            }

            .main-wrapper {
                margin-left: 0;
            }

            .hero {
                min-height: 60vh;
            }

            .hero-content {
                padding: 0 20px;
            }

            .container {
                padding: 60px 20px;
            }

            .about-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .products-grid {
                grid-template-columns: 1fr;
            }

            .about-card {
                padding: 30px;
            }
        }

        /* Scroll animations */
        .reveal {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.6s ease-out;
        }

        .reveal.active {
            opacity: 1;
            transform: translateY(0);
        }