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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }

        .tfci-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .tfci-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
        }

        .tfci-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }

        .tfci-logo {
            height: 40px;
            width: auto;
        }

        .tfci-nav-menu {
            display: flex;
            list-style: none;
            gap: 30px;
        }

        .tfci-nav-link {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            transition: color 0.3s ease;
            position: relative;
        }

        .tfci-nav-link:hover {
            color: #25D366;
        }

        .tfci-nav-link::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: #25D366;
            transition: width 0.3s ease;
        }

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

        .tfci-main {
            margin-top: 80px;
            min-height: calc(100vh - 80px);
        }

        .tfci-hero {
            background: linear-gradient(135deg, rgba(37, 211, 102, 0.9), rgba(25, 135, 84, 0.9));
            color: white;
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .tfci-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"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1.5" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="80" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
            animation: tfci-float 20s infinite linear;
        }

        @keyframes tfci-float {
            0% { transform: translateY(0px); }
            100% { transform: translateY(-100px); }
        }

        .tfci-hero-content {
            position: relative;
            z-index: 2;
        }

        .tfci-hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }

        .tfci-hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 30px;
            opacity: 0.9;
        }

        .tfci-cta-button {
            display: inline-block;
            background: white;
            color: #25D366;
            padding: 15px 40px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            transition: all 0.3s ease;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
        }

        .tfci-cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
        }

        .tfci-features {
            background: white;
            padding: 80px 0;
        }

        .tfci-section-title {
            text-align: center;
            font-size: 2.5rem;
            color: #333;
            margin-bottom: 50px;
            position: relative;
        }

        .tfci-section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: #25D366;
            border-radius: 2px;
        }

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

        .tfci-feature-card {
            background: white;
            padding: 40px 30px;
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            text-align: center;
            transition: transform 0.3s ease;
            border: 1px solid #f0f0f0;
        }

        .tfci-feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
        }

        .tfci-feature-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, #25D366, #128C7E);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 2rem;
            color: white;
        }

        .tfci-feature-title {
            font-size: 1.5rem;
            color: #333;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .tfci-feature-desc {
            color: #666;
            line-height: 1.6;
        }

        .tfci-compatibility {
            background: #f8f9fa;
            padding: 80px 0;
        }

        .tfci-compatibility-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .tfci-compatibility-text {
            padding-right: 20px;
        }

        .tfci-compatibility-title {
            font-size: 2.2rem;
            color: #333;
            margin-bottom: 25px;
            font-weight: 600;
        }

        .tfci-compatibility-desc {
            color: #666;
            font-size: 1.1rem;
            line-height: 1.7;
            margin-bottom: 30px;
        }

        .tfci-requirements-list {
            list-style: none;
            padding: 0;
        }

        .tfci-requirements-item {
            padding: 12px 0;
            border-bottom: 1px solid #eee;
            display: flex;
            align-items: center;
        }

        .tfci-requirements-item::before {
            content: '✓';
            color: #25D366;
            font-weight: bold;
            margin-right: 15px;
            font-size: 1.2rem;
        }

        .tfci-phone-mockup {
            text-align: center;
            position: relative;
        }

        .tfci-phone-frame {
            width: 300px;
            height: 600px;
            background: #333;
            border-radius: 40px;
            padding: 20px;
            margin: 0 auto;
            position: relative;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }

        .tfci-phone-screen {
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, #25D366, #128C7E);
            border-radius: 25px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
            font-weight: 600;
        }

        .tfci-download-section {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 80px 0;
            text-align: center;
        }

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

        .tfci-download-desc {
            font-size: 1.2rem;
            margin-bottom: 40px;
            opacity: 0.9;
        }

        .tfci-download-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        .tfci-download-btn {
            display: inline-flex;
            align-items: center;
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            color: white;
            padding: 15px 30px;
            border-radius: 15px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            border: 2px solid rgba(255, 255, 255, 0.3);
        }

        .tfci-download-btn:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-3px);
        }

        .tfci-footer {
            background: #333;
            color: white;
            padding: 40px 0;
            text-align: center;
        }

        .tfci-footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 30px;
        }

        .tfci-footer-section h3 {
            margin-bottom: 20px;
            color: #25D366;
        }

        .tfci-footer-links {
            list-style: none;
        }

        .tfci-footer-links li {
            margin-bottom: 10px;
        }

        .tfci-footer-links a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .tfci-footer-links a:hover {
            color: #25D366;
        }

        .tfci-footer-bottom {
            border-top: 1px solid #555;
            padding-top: 20px;
            color: #999;
        }

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

            .tfci-hero-title {
                font-size: 2.5rem;
            }

            .tfci-compatibility-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .tfci-phone-frame {
                width: 250px;
                height: 500px;
            }

            .tfci-download-buttons {
                flex-direction: column;
                align-items: center;
            }
        }