:root {
            --primary-color: #2563eb;
            --primary-dark: #1d4ed8;
            --secondary-color: #10b981;
            --accent-color: #f59e0b;
            --text-primary: #1f2937;
            --text-secondary: #6b7280;
            --bg-primary: #ffffff;
            --bg-secondary: #f9fafb;
            --border-color: #e5e7eb;
            --error-color: #ef4444;
            --success-color: #10b981;
            --warning-color: #f59e0b;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            line-height: 1.6;
            color: var(--text-primary);
            background-color: var(--bg-primary);
            overflow-x: hidden;
        }

        /* Smooth scrolling */
        html {
            scroll-behavior: smooth;
        }

        /* Navigation */
        .navbar {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            transition: all 0.3s ease;
        }

        .navbar.scrolled {
            background: rgba(255, 255, 255, 0.98);
            box-shadow: var(--shadow-md);
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
        }

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

        .nav-link {
            text-decoration: none;
            color: var(--text-primary);
            font-weight: 500;
            transition: color 0.3s ease;
            position: relative;
        }

        .nav-link:hover {
            color: var(--primary-color);
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-color);
            transition: width 0.3s ease;
        }

        .nav-link:hover::after {
            width: 100%;
        }

        .mobile-menu-toggle {
            display: none;
            flex-direction: column;
            cursor: pointer;
            padding: 5px;
        }

        .hamburger {
            width: 25px;
            height: 3px;
            background: var(--text-primary);
            margin: 3px 0;
            transition: 0.3s;
        }

        /* Hero Section */
        .hero {
            background: var(--gradient-primary);
            padding: 120px 20px 80px;
            text-align: center;
            color: white;
            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 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
            opacity: 0.3;
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .hero h1 {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }

        .hero p {
            font-size: 1.25rem;
            margin-bottom: 2.5rem;
            opacity: 0.9;
        }

        /* MAC Lookup Tool */
        .lookup-tool {
            background: white;
            padding: 40px;
            border-radius: 20px;
            box-shadow: var(--shadow-lg);
            margin: -60px auto 0;
            max-width: 600px;
            position: relative;
            z-index: 2;
        }

        .input-group {
            position: relative;
            margin-bottom: 20px;
        }

        .mac-input {
            width: 100%;
            padding: 16px 20px;
            border: 2px solid var(--border-color);
            border-radius: 12px;
            font-size: 1.1rem;
            transition: all 0.3s ease;
            background: var(--bg-secondary);
        }

        .mac-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }

        .mac-input.error {
            border-color: var(--error-color);
            box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
        }

        .mac-input.success {
            border-color: var(--success-color);
            box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
        }

        .input-label {
            position: absolute;
            top: -10px;
            left: 15px;
            background: white;
            padding: 0 5px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .validation-message {
            margin-top: 8px;
            font-size: 0.875rem;
            padding-left: 5px;
        }

        .validation-message.error {
            color: var(--error-color);
        }

        .validation-message.success {
            color: var(--success-color);
        }

        .lookup-btn {
            width: 100%;
            padding: 16px;
            background: var(--primary-color);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .lookup-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .lookup-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .loading-spinner {
            display: none;
            width: 20px;
            height: 20px;
            border: 2px solid transparent;
            border-top: 2px solid currentColor;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-right: 10px;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Results Section */
        .results-section {
            max-width: 1200px;
            margin: 80px auto;
            padding: 0 20px;
            display: none;
        }

        .results-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .results-header h2 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 15px;
        }

        .results-container {
            background: white;
            border-radius: 20px;
            box-shadow: var(--shadow-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
        }

        .result-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 30px;
            border-bottom: 1px solid var(--border-color);
        }

        .result-item:last-child {
            border-bottom: none;
        }

        .result-label {
            font-weight: 600;
            color: var(--text-secondary);
            min-width: 150px;
        }

        .result-value {
            font-weight: 500;
            color: var(--text-primary);
            text-align: right;
            flex: 1;
        }

        .result-actions {
            margin-top: 30px;
            display: flex;
            gap: 15px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .action-btn {
            padding: 12px 24px;
            border: 2px solid var(--primary-color);
            background: transparent;
            color: var(--primary-color);
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .action-btn:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-2px);
        }

        .action-btn.primary {
            background: var(--primary-color);
            color: white;
        }

        .action-btn.primary:hover {
            background: var(--primary-dark);
        }

        /* Content Sections */
        .section {
            padding: 80px 20px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 15px;
        }

        .section-subtitle {
            font-size: 1.2rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        /* Features Grid */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
            margin-top: 60px;
        }

        .feature-card {
            background: white;
            padding: 40px 30px;
            border-radius: 16px;
            box-shadow: var(--shadow-md);
            text-align: center;
            transition: all 0.3s ease;
            border: 1px solid var(--border-color);
        }

        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }

        .feature-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 20px;
            background: var(--gradient-primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
        }

        .feature-title {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 15px;
            color: var(--text-primary);
        }

        .feature-description {
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* How It Works */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-top: 60px;
        }

        .step-card {
            text-align: center;
            position: relative;
        }

        .step-number {
            width: 60px;
            height: 60px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0 auto 20px;
        }

        .step-title {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .step-description {
            color: var(--text-secondary);
        }

        /* FAQ Section */
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: white;
            border-radius: 12px;
            margin-bottom: 20px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
        }

        .faq-question {
            padding: 25px 30px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: var(--bg-secondary);
            transition: background 0.3s ease;
        }

        .faq-question:hover {
            background: #f3f4f6;
        }

        .faq-question h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0;
        }

        .faq-toggle {
            font-size: 1.5rem;
            color: var(--primary-color);
            transition: transform 0.3s ease;
        }

        .faq-answer {
            padding: 0 30px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .faq-answer.active {
            padding: 25px 30px;
            max-height: 200px;
        }

        .faq-answer p {
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }

        /* Article Section */
        .article-section {
            background: var(--bg-secondary);
            padding: 80px 20px;
        }

        .article-content {
            max-width: 800px;
            margin: 0 auto;
            background: white;
            padding: 60px;
            border-radius: 20px;
            box-shadow: var(--shadow-md);
        }

        .article-content h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 30px;
        }

        .article-content h3 {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--text-primary);
            margin: 30px 0 15px;
        }

        .article-content p {
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .article-content ul {
            margin: 20px 0;
            padding-left: 30px;
        }

        .article-content li {
            color: var(--text-secondary);
            margin-bottom: 10px;
            line-height: 1.6;
        }

        /* CTA Section */
        .cta-section {
            background: var(--gradient-secondary);
            padding: 80px 20px;
            text-align: center;
            color: white;
        }

        .cta-content {
            max-width: 600px;
            margin: 0 auto;
        }

        .cta-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .cta-description {
            font-size: 1.2rem;
            margin-bottom: 30px;
            opacity: 0.9;
        }

        .cta-button {
            display: inline-block;
            padding: 16px 32px;
            background: white;
            color: var(--primary-color);
            text-decoration: none;
            border-radius: 12px;
            font-weight: 600;
            font-size: 1.1rem;
            transition: all 0.3s ease;
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }

        /* Footer */
        .footer {
            background: var(--text-primary);
            color: white;
            padding: 60px 20px 30px;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }

        .footer-section h3 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .footer-section p,
        .footer-section a {
            color: #9ca3af;
            text-decoration: none;
            line-height: 1.6;
            margin-bottom: 10px;
            display: block;
        }

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

        .footer-bottom {
            border-top: 1px solid #374151;
            margin-top: 40px;
            padding-top: 20px;
            text-align: center;
            color: #9ca3af;
        }

        /* Cookie Notice */
        .cookie-notice {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: var(--text-primary);
            color: white;
            padding: 20px;
            z-index: 1001;
            transform: translateY(100%);
            transition: transform 0.3s ease;
        }

        .cookie-notice.show {
            transform: translateY(0);
        }

        .cookie-content {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        .cookie-text {
            flex: 1;
            font-size: 0.9rem;
        }

        .cookie-actions {
            display: flex;
            gap: 15px;
        }

        .cookie-btn {
            padding: 8px 16px;
            border: 1px solid white;
            background: transparent;
            color: white;
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.9rem;
            transition: all 0.3s ease;
        }

        .cookie-btn:hover {
            background: white;
            color: var(--text-primary);
        }

        .cookie-btn.accept {
            background: var(--primary-color);
            border-color: var(--primary-color);
        }

        .cookie-btn.accept:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 70px);
                background: white;
                flex-direction: column;
                justify-content: flex-start;
                align-items: center;
                padding: 50px 0;
                transition: left 0.3s ease;
                box-shadow: var(--shadow-lg);
            }

            .nav-menu.active {
                left: 0;
            }

            .mobile-menu-toggle {
                display: flex;
            }

            .mobile-menu-toggle.active .hamburger:nth-child(1) {
                transform: rotate(-45deg) translate(-5px, 6px);
            }

            .mobile-menu-toggle.active .hamburger:nth-child(2) {
                opacity: 0;
            }

            .mobile-menu-toggle.active .hamburger:nth-child(3) {
                transform: rotate(45deg) translate(-5px, -6px);
            }

            .hero h1 {
                font-size: 2.5rem;
            }

            .hero p {
                font-size: 1.1rem;
            }

            .lookup-tool {
                margin: -40px 20px 0;
                padding: 30px 20px;
            }

            .section-title {
                font-size: 2rem;
            }

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

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

            .article-content {
                padding: 40px 30px;
            }

            .cookie-content {
                flex-direction: column;
                text-align: center;
            }

            .cookie-actions {
                width: 100%;
                justify-content: center;
            }

            .result-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }

            .result-value {
                text-align: left;
            }

            .result-actions {
                flex-direction: column;
                align-items: stretch;
            }
        }

        @media (max-width: 480px) {
            .hero {
                padding: 100px 15px 60px;
            }

            .lookup-tool {
                margin: -30px 15px 0;
                padding: 25px 15px;
            }

            .section {
                padding: 60px 15px;
            }

            .article-content {
                padding: 30px 20px;
            }

            .nav-container {
                padding: 0 15px;
            }
        }

        /* Lazy loading styles */
        .lazy {
            opacity: 0;
            transition: opacity 0.3s;
        }

        .lazy.loaded {
            opacity: 1;
        }

        /* Animation classes */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.6s ease;
        }

        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* Pulse animation for loading */
        .pulse {
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% {
                opacity: 1;
            }
            50% {
                opacity: 0.5;
            }
        }