:root {
            --primary: #2A5CAA;
            --primary-light: #4A7CC8;
            --secondary: #F5F7FA;
            --accent: #FF6B35;
            --text: #333333;
            --text-light: #555555;
            --border: #E0E0E0;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --radius: 8px;
            --transition: all 0.3s ease;
            --purple: #9b59b6;
        }

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

        body {
            font-family: 'Roboto', sans-serif;
            line-height: 1.6;
            color: var(--text);
            background-color: white;
            padding: 20px;
        }

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

        .feature-section {
            padding: 60px 0;
        }

        .section-title {
            font-family: 'Montserrat', sans-serif;
            font-size: 2rem;
            text-align: center;
            margin-bottom: 50px;
            color: var(--primary);
            position: relative;
        }

        .section-title:after {
            content: '';
            display: block;
            width: 80px;
            height: 4px;
            background: var(--primary);
            margin: 15px auto 0;
        }

        .methods-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .method-card {
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
            overflow: hidden;
        }

        .method-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
        }

        .method-header {
            background: var(--primary);
            color: white;
            padding: 25px;
            text-align: center;
        }

        .method-header h3 {
            font-size: 1.8rem;
            margin-bottom: 10px;
        }

        .method-body {
            padding: 30px;
        }

        .method-icon {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 20px;
            text-align: center;
        }

        .method-features {
            margin: 25px 0;
        }

        .method-features li {
            display: flex;
            align-items: flex-start;
            margin-bottom: 12px;
            padding-left: 25px;
            position: relative;
        }

        .method-features li::before {
            content: '\f00c';
            font-family: 'Font Awesome 5 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            top: 5px;
            color: #27ae60;
        }

        .method-link {
            display: block;
            text-align: center;
            background: var(--primary);
            color: white;
            padding: 14px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
            margin-top: 20px;
        }

        .method-link:hover {
            background: #1E4A89;
            transform: translateY(-3px);
        }

        .video-container {
            width: 100%;
            border-radius: var(--radius);
            overflow: hidden;
            margin: 15px 0;
            position: relative;
            padding-bottom: 56.25%; /* 16:9 aspect ratio */
            height: 0;
        }

        .video-container iframe {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            border: none;
        }

        .model-number {
            font-weight: bold;
            margin: 15px 0;
            color: var(--text);
            font-size: 1.1rem;
        }

        .note-text {
            background: var(--secondary);
            padding: 25px;
            border-radius: var(--radius);
            margin-top: 40px;
            border-left: 4px solid var(--accent);
            font-size: 1.1rem;
            line-height: 1.7;
        }

        .note-text strong {
            color: var(--accent);
        }

        /* Color variations */
        .method-card:nth-child(2) .method-header {
            background: #27ae60;
        }
        .method-card:nth-child(2) .method-link {
            background: #27ae60;
        }
        
        .method-card:nth-child(3) .method-header {
            background: #e67e22;
        }
        .method-card:nth-child(3) .method-link {
            background: #e67e22;
        }
        
        .method-card:nth-child(4) .method-header {
            background: var(--purple);
        }
        .method-card:nth-child(4) .method-link {
            background: var(--purple);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .section-title {
                font-size: 1.8rem;
            }
            
            .method-header h3 {
                font-size: 1.5rem;
            }
            
            .methods-container {
                grid-template-columns: 1fr;
            }
        }