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

        :root {
            --primary-blue: #0284c7;
            --primary-teal: #008B8B;
            --earth-tone: #d4a574;
            --dark-slate: #1a3a3a;
            --light-bg: #f8fafb;
            --white: #ffffff;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --accent-light: #e0f2fe;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
        }

        /* Navigation */
        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            z-index: 1000;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 700;
            color: var(--primary-blue);
            font-size: 1.1rem;
            text-decoration: none;
        }

        .nav-logo-image {
            width: 40px;
            height: 40px;
            background: var(--primary-blue);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 800;
            font-size: 0.8rem;
        }

        .nav-menu {
            display: flex;
            gap: 2rem;
            list-style: none;
            align-items: center;
        }

        .nav-menu a {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.3s;
            cursor: pointer;
        }

        .nav-menu a:hover {
            color: var(--primary-blue);
        }

        .nav-menu a.active {
            color: var(--primary-blue);
            border-bottom: 2px solid var(--primary-blue);
            padding-bottom: 4px;
        }

        .cta-button {
            background: var(--primary-blue);
            color: white;
            padding: 0.6rem 1.4rem;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
            font-size: 0.95rem;
        }

        .cta-button:hover {
            background: var(--primary-teal);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
        }

        .cta-button-outline {
            background: transparent;
            color: var(--primary-blue);
            border: 2px solid var(--primary-blue);
            padding: 0.5rem 1.3rem;
        }

        .cta-button-outline:hover {
            background: var(--accent-light);
        }

        /* Hero Section */
        .page {
            display: none;
            padding-top: 80px;
        }

        .page.active {
            display: block;
            animation: fadeIn 0.5s ease-in;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .hero {
            background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 50%, #0891b2 100%);
            color: white;
            padding: 8rem 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><path d="M0 300 Q300 200 600 300 T1200 300" stroke="rgba(255,255,255,0.1)" stroke-width="2" fill="none"/><path d="M0 400 Q300 300 600 400 T1200 400" stroke="rgba(255,255,255,0.05)" stroke-width="2" fill="none"/></svg>');
            background-repeat: repeat-x;
            opacity: 0.3;
        }

        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 900px;
            margin: 0 auto;
        }

        .hero h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 0.5rem;
            line-height: 1.2;
        }

        .hero .subtitle {
            font-size: 2.4rem;
            font-weight:500;
            margin-bottom: 0.5rem;
            opacity: 0.95;
        }

        .hero .tagline {
            font-size: 1.1rem;
            font-weight: 500;
            margin-bottom: 1rem;
            color: #e0f2fe;
        }

        .hero .event-details {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin: 2rem 0;
            flex-wrap: wrap;
            font-size: 0.95rem;
            opacity: 0.9;
        }

        .event-detail {
            background: rgba(255, 255, 255, 0.1);
            padding: 0.8rem 1.5rem;
            border-radius: 30px;
            backdrop-filter: blur(10px);
        }

        .hero .cta-group {
            display: flex;
            gap: 1rem;
            justify-content: center;
            margin-top: 2.5rem;
            flex-wrap: wrap;
        }

        .hero .cta-button {
            background: white;
            color: var(--primary-blue);
            font-weight: 600;
        }

        .hero .cta-button:hover {
            background: #e0f2fe;
        }

        /* Sections */
        section {
            padding: 4rem 2rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        section h2 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            color: var(--dark-slate);
        }

        section h3 {
            font-size: 1.8rem;
            margin-bottom: 0.8rem;
            color: var(--text-dark);
        }

        section p {
            margin-bottom: 1.2rem;
            color: var(--text-light);
            font-size: 1rem;
            line-height: 1.8;
        }

        .section-lead {
            font-size: 1.1rem;
            color: var(--text-dark);
            margin-bottom: 2rem;
            font-weight: 500;
        }

        .vision-intro {
            background: white;
            padding: 3rem;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
            margin: 2rem 0;
            border-left: 4px solid var(--primary-blue);
        }

        /* Five Layer System */
        .layers-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }

        .layer-card {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            transition: all 0.3s;
            border-top: 3px solid var(--primary-blue);
        }

        .layer-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
        }

        .layer-card.layer-1 { border-top-color: #0284c7; }
        .layer-card.layer-2 { border-top-color: #0891b2; }
        .layer-card.layer-3 { border-top-color: #06b6d4; }
        .layer-card.layer-4 { border-top-color: #0ea5e9; }
        .layer-card.layer-5 { border-top-color: #22d3ee; }

        .layer-icon {
            width: 50px;
            height: 50px;
            background: var(--accent-light);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin-bottom: 1rem;
        }

        .layer-card h4 {
            font-size: 1.3rem;
            margin-bottom: 0.8rem;
            color: var(--text-dark);
        }

        .layer-card p {
            font-size: 0.95rem;
            margin-bottom: 0;
            color: var(--text-light);
        }

        /* Paper Themes */
        .papers-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }

        .paper-card {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            transition: all 0.3s;
            cursor: pointer;
        }

        .paper-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
            border-top: 3px solid var(--primary-blue);
        }

        .paper-category {
            display: inline-block;
            background: var(--accent-light);
            color: var(--primary-blue);
            padding: 0.4rem 0.8rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 0.8rem;
            text-transform: uppercase;
        }

        .paper-card h4 {
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
            color: var(--text-dark);
        }

        .paper-card p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 0;
        }

        /* Features Grid */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }

        .feature-card {
            text-align: center;
            padding: 1.5rem;
        }

        .feature-icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }

        .feature-card h4 {
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
            color: var(--text-dark);
        }

        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-light);
        }

        /* Stats */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }

        .stat-box {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            text-align: center;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-blue);
            margin-bottom: 0.5rem;
        }

        .stat-label {
            color: var(--text-light);
            font-weight: 500;
        }

        /* Partners Section */
        .partners-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
            align-items: center;
            justify-items: center;
        }

        .partner-logo {
            width: 120px;
            height: 80px;
            background: white;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid #e5e7eb;
            font-weight: 600;
            color: var(--text-light);
            font-size: 0.85rem;
            text-align: center;
            padding: 1rem;
        }

        /* Form */
        .form-group {
            margin-bottom: 1.5rem;
        }

        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--text-dark);
        }

        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #e5e7eb;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: border-color 0.3s;
        }

        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.1);
        }

        textarea {
            resize: vertical;
            min-height: 120px;
        }

        .form-container {
            max-width: 600px;
            margin: 0 auto;
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }

        /* Footer */
        footer {
            background: var(--dark-slate);
            color: white;
            padding: 3rem 2rem;
            margin-top: 4rem;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer-section h4 {
            margin-bottom: 1rem;
            font-size: 1.1rem;
        }

        .footer-section p, .footer-section a {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 0.8rem;
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-section a:hover {
            color: white;
        }

        .footer-divider {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 2rem;
            text-align: center;
            font-size: 0.9rem;
            opacity: 0.8;
        }

        .social-links {
            display: flex;
            gap: 1rem;
            margin-top: 1rem;
        }

        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            transition: all 0.3s;
        }

        .social-links a:hover {
            background: var(--primary-blue);
            transform: translateY(-2px);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }

            .hero h1 {
                font-size: 2.2rem;
            }

            .hero .event-details {
                flex-direction: column;
                gap: 1rem;
            }

            section h2 {
                font-size: 1.8rem;
            }

            .layers-grid, .papers-grid, .features-grid, .stats-grid {
                grid-template-columns: 1fr;
            }

            .hero .cta-group {
                flex-direction: column;
            }

            .hero .cta-button {
                width: 100%;
            }
        }

        .breadcrumb {
            opacity: 0.7;
            margin-bottom: 2rem;
            font-size: 0.9rem;
        }

        .breadcrumb a {
            color: var(--primary-blue);
            text-decoration: none;
            cursor: pointer;
        }

        .breadcrumb a:hover {
            text-decoration: underline;
        }

        .list-styled {
            list-style: none;
            padding: 0;
        }

        .list-styled li {
            padding-left: 1.5rem;
            margin-bottom: 0.8rem;
            position: relative;
            color: var(--text-light);
        }

        .list-styled li::before {
            content: '→';
            position: absolute;
            left: 0;
            color: var(--primary-blue);
            font-weight: bold;
        }

        .emphasis-box {
            background: linear-gradient(135deg, #e0f2fe 0%, #cffafe 100%);
            border-left: 4px solid var(--primary-blue);
            padding: 1.5rem;
            border-radius: 6px;
            margin: 2rem 0;
        }

        .emphasis-box strong {
            color: var(--primary-blue);
        }

        .button-group {
            display: flex;
            gap: 1rem;
            margin-top: 2rem;
            flex-wrap: wrap;
        }

        .research-callout {
            background: white;
            border: 2px solid var(--primary-blue);
            padding: 2rem;
            border-radius: 10px;
            margin: 2rem 0;
            text-align: center;
        }

        .research-callout h3 {
            color: var(--primary-blue);
            margin-bottom: 1rem;
        }

        .toggle-btn {
            background: var(--accent-light);
            color: var(--primary-blue);
            border: 1px solid var(--primary-blue);
            padding: 0.6rem 1.2rem;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s;
        }

        .toggle-btn:hover {
            background: var(--primary-blue);
            color: white;
        }

        .toggle-content {
            display: none;
            margin-top: 1rem;
            padding-top: 1rem;
            border-top: 1px solid #e5e7eb;
        }

        .toggle-content.show {
            display: block;
        }

        .content-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: start;
        }
        
        
        
        /* ========================================
        MOBILE HAMBURGER MENU STYLES
        ======================================== */
        
        /* Hamburger Button */
        .hamburger-menu {
        display: none; /* Hidden by default on desktop */
        flex-direction: column;
        justify-content: space-around;
        width: 30px;
        height: 25px;
        background: transparent;
        border: none;
        cursor: pointer;
        padding: 0;
        z-index: 1001;
        transition: transform 0.3s ease;
        }
        
        .hamburger-menu span {
        width: 100%;
        height: 3px;
        background: #0284c7;
        border-radius: 2px;
        transition: all 0.3s ease;
        transform-origin: center;
        }
        
        /* Hamburger Animation when Open */
        .hamburger-menu.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
        }
        
        .hamburger-menu.active span:nth-child(2) {
        opacity: 0;
        transform: scale(0);
        }
        
        .hamburger-menu.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
        }
        
        /* Mobile Menu Overlay (Dark Background) */
        .mobile-menu-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        transition: opacity 0.3s ease;
        }
        
        .mobile-menu-overlay.active {
        display: block;
        opacity: 1;
        }
        
        /* Mobile Navigation Menu */
        .mobile-nav {
        display: none;
        position: fixed;
        top: 70px;
        right: -100%;
        width: 280px;
        max-width: 85%;
        height: calc(100vh - 70px);
        background: white;
        box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
        z-index: 1000;
        overflow-y: auto;
        transition: right 0.3s ease;
        padding: 20px 0;
        }
        
        .mobile-nav.active {
        right: 0;
        }
        
        .mobile-nav a {
        display: block;
        padding: 15px 25px;
        color: #1e293b;
        text-decoration: none;
        font-size: 16px;
        font-weight: 500;
        border-bottom: 1px solid #e2e8f0;
        transition: all 0.2s ease;
        }
        
        .mobile-nav a:hover {
        background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
        color: white;
        padding-left: 30px;
        }
        
        .mobile-nav a:last-child {
        border-bottom: none;
        }
        
        /* Show hamburger menu on mobile devices */
        @media (max-width: 768px) {
        .hamburger-menu {
        display: flex;
        }
        
        .mobile-nav {
        display: block;
        }
        
        /* Hide desktop navigation on mobile */
        nav ul {
        display: none !important;
        }
        }
        
        /* Extra small devices */
        @media (max-width: 480px) {
        .mobile-nav {
        width: 100%;
        max-width: 100%;
        }
        }



        @media (max-width: 768px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .hero .subtitle
            {
                font-size: 1.4rem;
            }
        }