/* --- CSS VARIABLES & RESET --- */
        :root {
            --bg-dark: #090d16;
            --bg-card: #111827;
            --accent-cyan: #06b6d4;
            --accent-blue: #2563eb;
            --accent-insta: #e1306c;
            --accent-yt: #ff0000;
            --text-main: #f3f4f6;
            --text-muted: #9ca3af;
            --border-color: #1f2937;
            --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

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

        body {
            background-color: var(--bg-dark);
            color: var(--text-main);
            font-family: var(--font-family);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* --- BACKGROUND CANVAS --- */
        #bg-canvas {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            pointer-events: none;
        }

        /* --- NAVBAR --- */
        header {
            position: fixed;
            top: 0;
            width: 100%;
        
            background: rgba(9, 13, 22, 0.85);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 2rem 1rem;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: 2px;
            color: #fff;
            text-decoration: none;
        }

        .logo span {
            color: var(--accent-cyan);
        }
        .ctn{
            color: var(--bg-dark);
            background: #06b6d4;
        }

        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
        }

        .nav-links a {
            color: var(--text-main);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            padding: 0.4rem 0.8rem;
            border-radius: 6px;
            
        }

        .nav-links a:hover {
            color: var(--accent-cyan);
            
            border-radius: 8px;
            border: 8px;
            background-color: var(--text-main);
        }

        /* --- SECTIONS COMMON --- */
        section {
            padding: 6rem 2rem 1rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        .section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: 1rem;
            color: #fff;
        }

        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            max-width: 650px;
            margin: 0 auto 3rem;
        }

        /* --- HERO SECTION --- */
        .hero {
            min-height: 80vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            padding-top: 4rem;
        }

        .hero h1 {
            font-size: 3.5rem;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            background: linear-gradient(135deg, #ffffff 0%, var(--accent-cyan) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            font-size: 1.25rem;
            color: var(--text-muted);
            max-width: 750px;
            margin-bottom: 2.5rem;
        }

        .btn-group {
            display: flex;
            gap: 1rem;
        }

        .btn {
            padding: 0.8rem 2rem;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .btn-primary {
            background: var(--accent-cyan);
            color: #000;
        }

        .btn-primary:hover {
            box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
            transform: translateY(-2px);
        }

        .btn-secondary {
            border: 1px solid var(--border-color);
            color: var(--text-main);
            background: rgba(255, 255, 255, 0.05);
        }

        .btn-secondary:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        /* --- SERVICES SECTION --- */
        #services {
            padding-top: 8rem; /* Padding adjusted for fixed header */
        }

        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
        }

        .service-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 2.5rem;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .service-card:hover {
            transform: translateY(-6px);
            border-color: var(--accent-cyan);
            box-shadow: 0 10px 25px rgba(6, 182, 212, 0.15);
        }

        .service-icon {
            font-size: 2.5rem;
            margin-bottom: 1.2rem;
        }

        .service-card h3 {
            color: #fff;
            font-size: 1.4rem;
            margin-bottom: 0.8rem;
        }

        .service-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 1.5rem;
            line-height: 1.5;
        }

        .service-features {
            list-style: none;
            margin-bottom: 2rem;
            padding: 0;
        }

        .service-features li {
            color: var(--text-main);
            font-size: 0.9rem;
            margin-bottom: 0.6rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .service-features li::before {
            content: "✓";
            color: var(--accent-cyan);
            font-weight: bold;
        }

        .service-btn {
            display: inline-block;
            text-align: center;
            padding: 0.75rem 1.2rem;
            border-radius: 6px;
            background: transparent;
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .service-btn:hover {
            background: var(--accent-cyan);
            color: #000;
        }

        /* --- RESEARCH DIVISIONS --- */
        .division-nav {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin-bottom: 2rem;
        }

        .tab-btn {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            color: var(--text-muted);
            padding: 0.6rem 1.2rem;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .tab-btn.active, .tab-btn:hover {
            background: var(--accent-cyan);
            color: #000;
            border-color: var(--accent-cyan);
            font-weight: 600;
        }

        .division-display {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 2.5rem;
            min-height: 250px;
        }

        .division-display h3 {
            font-size: 1.8rem;
            color: var(--accent-cyan);
            margin-bottom: 1rem;
        }

        .division-display p {
            color: var(--text-muted);
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }

        .focus-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }

        .tag {
            background: rgba(6, 182, 212, 0.1);
            color: var(--accent-cyan);
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.85rem;
            border: 1px solid rgba(6, 182, 212, 0.2);
        }

        /* --- YOUTUBE MEDIA SECTION --- */
        .channel-header {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 2rem;
            margin-bottom: 2.5rem;
            flex-wrap: wrap;
        }

        .channel-info {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }

        .channel-avatar-btn {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: #ff0000;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            color: #fff;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .channel-avatar-btn:hover {
            transform: scale(1.08);
            box-shadow: 0 0 15px rgba(255, 0, 0, 0.6);
        }

        .video-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 1.5rem;
        }

        .video-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
            transition: transform 0.3s, border-color 0.3s;
            cursor: pointer;
        }

        .video-card:hover {
            transform: translateY(-5px);
            border-color: #ff0000;
        }

        .thumbnail-container {
            position: relative;
            width: 100%;
            padding-top: 56.25%;
            background: #000;
        }

        .thumbnail-container img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .play-icon {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 50px;
            height: 50px;
            background: rgba(255, 0, 0, 0.85);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
            transition: scale 0.2s;
        }

        .video-card:hover .play-icon {
            scale: 1.1;
        }

        .video-info {
            padding: 1.2rem;
        }

        .video-info h4 {
            font-size: 1.05rem;
            color: #fff;
            margin-bottom: 0.5rem;
            line-height: 1.4;
        }

        .video-meta {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* --- MODAL PLAYER --- */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.9);
            z-index: 2000;
            align-items: center;
            justify-content: center;
            padding: 2rem;
        }

        .modal-content {
            position: relative;
            width: 100%;
            max-width: 900px;
            aspect-ratio: 16/9;
            background: #000;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
        }

        .modal-close {
            position: absolute;
            top: -40px;
            right: 0;
            color: #fff;
            font-size: 2rem;
            cursor: pointer;
            transition: color 0.2s;
        }

        .modal-close:hover {
            color: var(--accent-cyan);
        }

        .modal iframe {
            width: 100%;
            height: 100%;
            border: none;
        }
        .YTL {
            text-decoration: none;
        }

        /* --- FOOTER & CONTACT LINKS --- */
        footer {
            border-top: 1px solid var(--border-color);
            background: var(--bg-card);
            padding: 3rem 2rem 2rem;
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2rem;
        }

        .footer-brand {
            text-align: center;
        }

        .footer-links-grid {
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
        }

        .footer-link-item {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--text-main);
            text-decoration: none;
            padding: 0.6rem 1.2rem;
            border-radius: 6px;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .footer-link-item:hover {
            border-color: var(--accent-cyan);
            color : var(--accent-cyan);
            transform : translateY(-2px);
        }

        .footer-link-item.yt:hover {
            border-color: var(--accent-yt);
            color: var(--accent-yt);
        }

        .footer-link-item.insta:hover {
            border-color: orangered;
            color: orangered;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            width: 100%;
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.85rem;
        }

        /* RESPONSIVE DESIGN */
        @media (max-width: 768px) {
            .hero h1 { font-size: 2.2rem; }
            .nav-links { display: none; }
            .btn-group { flex-direction: column; width: 100%; }
            .btn { text-align: center; }
            .channel-header { flex-direction: column; text-align: center; }
            .channel-info { flex-direction: column; }
            .footer-links-grid { flex-direction: column; width: 100%; }
            .footer-link-item { justify-content: center; }
        }