* {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', sans-serif;
            background-color: #0a0a0a;
            color: #e5e5e5;
        }
        
        .course-path {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .course-node {
            transition: all 0.3s ease;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .course-node:hover {
            transform: scale(1.05);
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
            background: rgba(255, 255, 255, 0.1);
        }

        svg path {
            transition: stroke 0.3s ease;
        }

        .course-node:hover + svg path,
        svg path:hover {
            stroke: url(#grad1-hover);
        }

        @media (max-width: 768px) {
            .course-path {
                flex-direction: column;
                align-items: center;
                min-height: auto !important;
            }

            .course-path svg {
                display: none;
            }

            .course-path .grid {
                grid-template-columns: 1fr !important;
                grid-template-rows: auto !important;
                gap: 1.5rem !important;
                min-height: auto !important;
            }

            .course-node {
                margin: 0 auto;
                max-width: 100% !important;
                width: 100%;
            }
            
            .header-container {
                padding: 0.75rem !important;
            }
            
            .nav-item, .signin-btn, .download-btn {
                font-size: 0.75rem !important;
                padding: 0.5rem 0.75rem !important;
            }
            
            .logo-text {
                font-size: 1rem !important;
            }
            
            .logo-icon {
                width: 1.5rem !important;
                height: 1.5rem !important;
            }
            
            .logo-inner {
                width: 1.2rem !important;
                height: 1.2rem !important;
            }
            
            .tab {
                padding: 0.5rem !important;
                font-size: 0.75rem !important;
            }
            
            .vercel-card {
                padding: 1rem !important;
            }
            
            .course-icon {
                font-size: 4rem !important;
            }
            
            .footer-grid {
                grid-template-columns: 1fr !important;
                gap: 2rem !important;
            }
            
            .footer-section {
                margin-bottom: 1.5rem;
            }
            
            .cta-card {
                padding: 1.5rem !important;
            }
            
            .path-line {
                display: none !important;
            }
        }

        @media (min-width: 769px) {
            .course-path .grid {
                grid-template-columns: repeat(3, 1fr);
                grid-template-rows: repeat(4, auto);
            }
        }

        svg defs {
        }
        svg defs::after {
            content: '';
            display: none;
        }
        #grad1-hover {
            stop-color: rgba(138, 43, 226, 1);
            stop-opacity: 1;
        }
        
        .path-line {
            position: absolute;
            background: linear-gradient(to right, rgba(138, 43, 226, 0.5), rgba(75, 0, 130, 0.5));
            z-index: 1;
        }
        
        .path-line-horizontal {
            height: 2px;
            width: 100px;
        }
        
        .path-line-vertical {
            width: 2px;
            height: 60px;
        }
        
        .path-line-diagonal {
            width: 120px;
            height: 2px;
            transform: rotate(-45deg);
            transform-origin: left center;
        }
        
        .path-line-curved {
            width: 100px;
            height: 80px;
            border: 2px solid transparent;
            border-image: linear-gradient(to right, rgba(138, 43, 226, 0.5), rgba(75, 0, 130, 0.5));
            border-image-slice: 1;
            border-right: none;
            border-bottom: none;
            border-radius: 50% 0 0 0;
        }
        
        @media (max-width: 1024px) {
            .path-line-horizontal {
                width: 60px;
            }
            
            .path-line-diagonal {
                width: 80px;
            }
            
            .path-line-curved {
                width: 60px;
                height: 50px;
            }
        }
        
        .header-container {
            background: #000;
            border-radius: 9999px;
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .nav-item {
            position: relative;
            letter-spacing: 0.5px;
            transition: all 0.3s ease;
        }
        .nav-item:hover {
            transform: translateY(-2px);
            text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
        }
        .signin-btn {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: all 0.3s ease;
        }
        .signin-btn:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: scale(1.05);
        }
        .download-btn {
            background: white;
            color: black;
            transition: all 0.3s ease;
        }
        .download-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
        }
        
        @media (max-width: 640px) {
            .header-nav {
                display: none !important;
            }
            
            .header-buttons {
                margin-left: auto;
            }
            
            .hero-title {
                font-size: 2.25rem !important;
                line-height: 1.2 !important;
            }
            
            .hero-subtitle {
                font-size: 1rem !important;
            }
            
            .section-title {
                font-size: 1.75rem !important;
            }
            
            .section-subtitle {
                font-size: 1rem !important;
            }
            
            .course-grid {
                grid-template-columns: 1fr !important;
            }
            
            .learning-paths {
                grid-template-columns: 1fr !important;
            }
            
            .course-card-title {
                font-size: 1.125rem !important;
            }
            
            .footer-logo {
                text-align: center;
                margin-bottom: 1.5rem;
            }
            
            .footer-links {
                text-align: center;
            }
            
            .footer-copyright {
                text-align: center;
            }
        }
        
        @media (min-width: 641px) and (max-width: 768px) {
            .header-nav {
                display: none !important;
            }
            
            .hero-title {
                font-size: 3rem !important;
            }
            
            .course-grid {
                grid-template-columns: repeat(2, 1fr) !important;
            }
        }

        /* Modal styles for login/signup */
        .modal {
            animation: modalFadeIn 0.3s ease-out;
        }
        @keyframes modalFadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .loader {
            animation: spin 1s linear infinite;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .vercel-btn {
            background: white;
            color: black;
            border-radius: 5px;
            padding: 0.5rem 1rem;
            font-weight: 500;
            transition: all 0.2s ease;
        }
        .vercel-btn:hover {
            background: #e5e5e5;
            transform: translateY(-1px);
        }
        .btn-secondary {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.2);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        .tab-active {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: white;
        }
        .vercel-card {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .vercel-card:hover {
            background: rgba(255, 255, 255, 0.05);
            border-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-3px);
        }
        .hover-scale {
            transition: transform 0.3s ease;
        }
        .hover-scale:hover {
            transform: scale(1.05);
        }
        
        /* Mobile menu specific styles */
        #mobileMenuButton {
            position: fixed;
            top: 1.5rem;
            right: 1rem;
            z-index: 55;
        }
        
        #mobileMenuOverlay {
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            z-index: 60;
        }
        
        #mobileMenu {
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            z-index: 61;
            max-height: 100vh;
            overflow-y: auto;
        }
        
        /* Ensure mobile menu appears above header */
        header {
            z-index: 50;
        }