:root {
            --color-primary: #1F2937;
            --color-secondary: #0EA5E9;
            --color-accent: #06B6D4;
            --color-success: #10B981;
            --color-warning: #F59E0B;
            --color-danger: #EF4444;
            --color-bg: #FFFFFF;
            --color-bg-light: #F9FAFB;
            --color-text: #111827;
            --color-text-light: #6B7280;
            --color-border: #E5E7EB;
            --spacing-xs: 8px;
            --spacing-sm: 12px;
            --spacing-md: 16px;
            --spacing-lg: 24px;
            --spacing-xl: 32px;
            --spacing-2xl: 48px;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background-color: var(--color-bg);
            color: var(--color-text);
            line-height: 1.6;
            font-size: 16px;
        }

        /* Header & Navigation */
        header {
            background: linear-gradient(135deg, var(--color-primary) 0%, #374151 100%);
            color: white;
            padding: var(--spacing-lg) 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-md);
        }

        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--spacing-md);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 24px;
            font-weight: 700;
            letter-spacing: -0.5px;
        }

        .nav-links {
            display: flex;
            gap: var(--spacing-lg);
            list-style: none;
        }

        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: opacity 0.3s ease;
        }

        .nav-links a:hover {
            opacity: 0.8;
        }

        /* Hero Section */
        .hero {
            background: linear-gradient(135deg, #0EA5E9 0%, #06B6D4 100%);
            color: white;
            padding: var(--spacing-2xl) var(--spacing-lg);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 500px;
            height: 500px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            animation: float 20s ease-in-out infinite;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(30px); }
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: 48px;
            font-weight: 800;
            margin-bottom: var(--spacing-md);
            letter-spacing: -1px;
        }

        .hero p {
            font-size: 20px;
            margin-bottom: var(--spacing-lg);
            opacity: 0.95;
        }

        /* Button Styles */
        .btn {
            display: inline-block;
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--radius-md);
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
            font-size: 16px;
        }

        .btn-primary {
            background: var(--color-success);
            color: white;
            box-shadow: var(--shadow-md);
        }

        .btn-primary:hover {
            background: #059669;
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .btn-secondary {
            background: white;
            color: var(--color-secondary);
            border: 2px solid var(--color-secondary);
        }

        .btn-secondary:hover {
            background: var(--color-secondary);
            color: white;
        }

        .cta-buttons {
            display: flex;
            gap: var(--spacing-md);
            justify-content: center;
            flex-wrap: wrap;
            margin-top: var(--spacing-lg);
        }

        /* Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }

        /* Sections */
        section {
            padding: var(--spacing-2xl) 0;
            border-bottom: 1px solid var(--color-border);
        }

        section.light {
            background: var(--color-bg-light);
        }

        h2 {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: var(--spacing-lg);
            color: var(--color-primary);
        }

        h3 {
            font-size: 24px;
            font-weight: 600;
            margin: var(--spacing-lg) 0 var(--spacing-md) 0;
            color: var(--color-primary);
        }

        /* Grid Layouts */
        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: var(--spacing-lg);
            margin-top: var(--spacing-lg);
        }

        .card {
            background: white;
            border-radius: var(--radius-lg);
            padding: var(--spacing-lg);
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            border: 1px solid var(--color-border);
        }

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

        .card-icon {
            font-size: 32px;
            margin-bottom: var(--spacing-md);
        }

        .card h4 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: var(--spacing-sm);
            color: var(--color-primary);
        }

        .card p {
            color: var(--color-text-light);
            margin-bottom: 0;
        }

        /* Feature List */
        .features-list {
            list-style: none;
        }

        .features-list li {
            padding: var(--spacing-sm) 0;
            border-bottom: 1px solid var(--color-border);
            display: flex;
            gap: var(--spacing-md);
        }

        .features-list li:last-child {
            border-bottom: none;
        }

        .features-list li::before {
            content: '✓';
            color: var(--color-success);
            font-weight: bold;
            font-size: 20px;
            flex-shrink: 0;
        }

        /* Image Placeholder */
        .image-placeholder {
            background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-accent) 100%);
            border-radius: var(--radius-lg);
            aspect-ratio: 16 / 9;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 18px;
            font-weight: 600;
            margin: var(--spacing-lg) 0;
            box-shadow: var(--shadow-md);
        }

        /* Testimonials */
        .testimonial {
            background: white;
            border-left: 4px solid var(--color-secondary);
            padding: var(--spacing-lg);
            margin: var(--spacing-md) 0;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
        }

        .testimonial-author {
            font-weight: 600;
            color: var(--color-primary);
            margin-top: var(--spacing-md);
        }

        .testimonial-role {
            color: var(--color-text-light);
            font-size: 14px;
        }

        .stars {
            color: #FBBF24;
            margin-bottom: var(--spacing-sm);
        }

        /* FAQ Accordion */
        .faq-item {
            background: white;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            margin: var(--spacing-md) 0;
            overflow: hidden;
        }

        .faq-question {
            padding: var(--spacing-lg);
            background: var(--color-bg-light);
            cursor: pointer;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 0.3s ease;
        }

        .faq-question:hover {
            background: #F3F4F6;
        }

        .faq-answer {
            padding: var(--spacing-lg);
            display: none;
            border-top: 1px solid var(--color-border);
            color: var(--color-text-light);
        }

        .faq-answer.active {
            display: block;
        }

        .faq-toggle {
            font-size: 20px;
            transition: transform 0.3s ease;
        }

        .faq-toggle.active {
            transform: rotate(180deg);
        }

        /* Footer */
        footer {
            background: var(--color-primary);
            color: white;
            padding: var(--spacing-2xl) var(--spacing-lg);
            text-align: center;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .footer-links {
            display: flex;
            gap: var(--spacing-lg);
            justify-content: center;
            flex-wrap: wrap;
            margin: var(--spacing-lg) 0;
        }

        .footer-links a {
            color: white;
            text-decoration: none;
            font-size: 14px;
            transition: opacity 0.3s ease;
        }

        .footer-links a:hover {
            opacity: 0.8;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.2);
            padding-top: var(--spacing-lg);
            font-size: 14px;
            opacity: 0.9;
        }

        /* Download Stats */
        .stats {
            display: flex;
            justify-content: space-around;
            gap: var(--spacing-lg);
            flex-wrap: wrap;
            margin: var(--spacing-xl) 0;
            padding: var(--spacing-xl);
            background: linear-gradient(135deg, rgba(14,165,233,0.1) 0%, rgba(6,182,212,0.1) 100%);
            border-radius: var(--radius-lg);
        }

        .stat {
            text-align: center;
        }

        .stat-number {
            font-size: 32px;
            font-weight: 700;
            color: var(--color-secondary);
            display: block;
        }

        .stat-label {
            color: var(--color-text-light);
            font-size: 14px;
            margin-top: var(--spacing-xs);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 32px;
            }

            .hero p {
                font-size: 16px;
            }

            h2 {
                font-size: 28px;
            }

            .nav-links {
                display: none;
            }

            .cta-buttons {
                flex-direction: column;
            }

            .btn {
                width: 100%;
                text-align: center;
            }

            .stats {
                flex-direction: column;
            }
        }

        /* Accessibility */
        :focus-visible {
            outline: 2px solid var(--color-secondary);
            outline-offset: 2px;
        }

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            white-space: nowrap;
            border-width: 0;
        }