:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --secondary: #7c3aed;
            --accent: #10b981;
            --accent-dark: #059669;
            --dark: #0f172a;
            --light: #f8fafc;
            --gray: #64748b;
            --gray-light: #f1f5f9;
            --border: #e2e8f0;
            --shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 25px 50px rgba(0, 0, 0, 0.12);
            --radius: 16px;
            --radius-sm: 8px;
            --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            --gradient: linear-gradient(135deg, #2563eb, #7c3aed);
            --gradient-dark: linear-gradient(135deg, #1d4ed8, #6d28d9);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        html {
            scroll-behavior: smooth;
        }
        
        body {
            font-family: 'Inter', sans-serif;
            line-height: 1.8;
            color: var(--dark);
            background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
            overflow-x: hidden;
            font-weight: 400;
        }
        
        h1, h2, h3, h4, h5 {
            font-family: 'Poppins', sans-serif;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1.5rem;
        }
        
        h1 {
            font-size: 3.5rem;
            background: linear-gradient(135deg, var(--dark), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 1rem;
        }
        
        h2 {
            font-size: 2.5rem;
            color: var(--dark);
            position: relative;
            padding-bottom: 1rem;
        }
        
        h2:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: var(--gradient);
            border-radius: 2px;
        }
        
        h3 {
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }
        
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            color: var(--gray);
            font-weight: 400;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* Author Section */
        .author-section {
            max-width: 800px;
            margin: 2rem auto 3rem;
            padding: 25px;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(124, 58, 237, 0.05));
            border-radius: var(--radius);
            border-left: 4px solid var(--primary);
            position: relative;
        }
        
        .author-content {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        
        .author-avatar {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--gradient);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 2rem;
            font-weight: bold;
            flex-shrink: 0;
        }
        
        .author-info {
            flex: 1;
            min-width: 250px;
        }
        
        .author-name {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 5px;
        }
        
        .author-title {
            font-size: 1rem;
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 10px;
        }
        
        .author-description {
            font-size: 1rem;
            color: var(--gray);
            line-height: 1.6;
        }
        
        /* Central Email List Building Image */
        .central-image-section {
            padding: 60px 0;
            text-align: center;
            background: linear-gradient(135deg, #f1f5f9 0%, #ffffff 100%);
            margin: 60px 0;
            border-radius: var(--radius);
            position: relative;
            overflow: hidden;
        }
        
        .central-image-section:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(45deg, rgba(37, 99, 235, 0.03), rgba(124, 58, 237, 0.03));
            z-index: 0;
        }
        
        .central-image-container {
            position: relative;
            z-index: 1;
            max-width: 900px;
            margin: 0 auto;
        }
        
        .central-image-title {
            font-size: 2.2rem;
            color: var(--dark);
            margin-bottom: 1.5rem;
            position: relative;
            display: inline-block;
        }
        
        .central-image-title:after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--gradient);
            border-radius: 2px;
        }
        
        .central-image-description {
            font-size: 1.2rem;
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto 2.5rem;
            line-height: 1.7;
        }
        
        .email-list-image {
            width: 100%;
            max-width: 900px;
            height: auto;
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            transition: var(--transition);
            margin: 0 auto;
            display: block;
            border: 1px solid rgba(226, 232, 240, 0.5);
        }
        
        .email-list-image:hover {
            transform: translateY(-5px);
            box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
        }
        
        .image-caption {
            margin-top: 20px;
            font-size: 1rem;
            color: var(--gray);
            font-style: italic;
            text-align: center;
            padding: 0 20px;
        }
        
        /* FAQ Section */
        .faq-section {
            padding: 80px 0;
            background: var(--light);
            margin: 60px 0;
        }
        
        .faq-container {
            max-width: 900px;
            margin: 0 auto;
        }
        
        .faq-item {
            background: white;
            border-radius: var(--radius);
            margin-bottom: 25px;
            padding: 30px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border-left: 4px solid transparent;
        }
        
        .faq-item:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-left-color: var(--primary);
        }
        
        .faq-question {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--dark);
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .faq-question:before {
            content: 'Q:';
            color: var(--primary);
            font-weight: 700;
            font-size: 1.5rem;
            min-width: 30px;
        }
        
        .faq-answer {
            color: var(--gray);
            line-height: 1.8;
            padding-left: 42px;
            position: relative;
            font-size: 1.05rem;
        }
        
        .faq-answer:before {
            content: 'A:';
            position: absolute;
            left: 0;
            color: var(--accent);
            font-weight: 700;
            font-size: 1.5rem;
            top: 0;
        }
        
        .faq-answer strong {
            color: var(--dark);
            font-weight: 600;
        }
        
        /* Call to Action Box */
        .cta-guide-box {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            padding: 40px;
            border-radius: var(--radius);
            margin: 50px 0;
            text-align: center;
            box-shadow: var(--shadow-lg);
            position: relative;
            overflow: hidden;
        }
        
        .cta-guide-box:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(45deg, rgba(255,255,255,0.1), transparent);
            z-index: 0;
        }
        
        .cta-guide-content {
            position: relative;
            z-index: 1;
        }
        
        .cta-guide-title {
            font-size: 2rem;
            margin-bottom: 15px;
            color: white;
        }
        
        .cta-guide-text {
            font-size: 1.2rem;
            margin-bottom: 25px;
            color: rgba(255, 255, 255, 0.9);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .cta-guide-button {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            background: white;
            color: var(--primary);
            padding: 16px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.1rem;
            text-decoration: none;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
            transition: var(--transition);
            border: none;
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }
        
        .cta-guide-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
            background: var(--light);
        }
        
        /* Header - Mobile First Approach */
        header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.5);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            padding: 15px 0;
            transition: var(--transition);
        }
        
        header.scrolled {
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            background: rgba(255, 255, 255, 0.98);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }
        
        /* Logo */
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            flex-shrink: 0;
        }
        
        .logo-img {
            height: 40px;
            width: 40px;
            object-fit: contain;
        }
        
        .logo-text {
            font-family: 'Poppins', sans-serif;
            font-size: 1.5rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--dark), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            white-space: nowrap;
        }
        
        /* CTA Button */
        .header-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--gradient);
            color: white;
            padding: 12px 24px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            text-decoration: none;
            box-shadow: 0 8px 20px rgba(37, 99, 235, 0.2);
            transition: var(--transition);
            border: none;
            cursor: pointer;
            white-space: nowrap;
            flex-shrink: 0;
        }
        
        .header-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 25px rgba(37, 99, 235, 0.3);
        }
        
        .cta-button {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            background: var(--gradient);
            color: white;
            padding: 16px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.05rem;
            text-decoration: none;
            box-shadow: 0 10px 25px rgba(37, 99, 235, 0.2);
            transition: var(--transition);
            border: none;
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }
        
        .cta-button:before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: 0.5s;
        }
        
        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 35px rgba(37, 99, 235, 0.3);
        }
        
        .cta-button:hover:before {
            left: 100%;
        }
        
        /* Hero Section */
        .hero {
            padding: 150px 0 80px;
            position: relative;
            overflow: hidden;
            background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
            margin-top: 70px;
        }
        
        .hero:before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 50%;
            height: 100%;
            background: linear-gradient(45deg, rgba(124, 58, 237, 0.05), rgba(37, 99, 235, 0.05));
            clip-path: polygon(100% 0, 100% 100%, 0 100%, 25% 0);
            z-index: 0;
        }
        
        .hero-content {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }
        
        .hero-subtitle {
            font-size: 1.1rem;
            color: var(--primary);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            margin-bottom: 1rem;
            display: inline-block;
        }
        
        .hero-description {
            font-size: 1.2rem;
            line-height: 1.7;
            color: var(--gray);
            margin-bottom: 2.5rem;
            font-weight: 400;
        }
        
        /* Stats Section */
        .stats {
            padding: 60px 0;
            background: var(--light);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }
        
        .stat-item {
            text-align: center;
            padding: 30px;
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .stat-item:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }
        
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 0.5rem;
            line-height: 1;
        }
        
        .stat-label {
            font-size: 1rem;
            color: var(--gray);
            font-weight: 500;
        }
        
        /* Steps Section */
        .steps-section {
            padding: 80px 0;
            position: relative;
        }
        
        .steps-section:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border), transparent);
        }
        
        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 60px;
        }
        
        .section-subtitle {
            font-size: 1rem;
            color: var(--primary);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            margin-bottom: 1rem;
        }
        
        .steps-container {
            position: relative;
        }
        
        .steps-container:before {
            content: '';
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 2px;
            background: linear-gradient(to bottom, transparent, var(--border), transparent);
            transform: translateX(-50%);
            z-index: 0;
        }
        
        .step {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            margin-bottom: 80px;
            position: relative;
            z-index: 1;
        }
        
        .step:nth-child(even) {
            direction: rtl;
        }
        
        .step:nth-child(even) .step-content {
            direction: ltr;
        }
        
        .step-content {
            padding: 40px;
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            position: relative;
            transition: var(--transition);
        }
        
        .step-content:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }
        
        .step-number {
            position: absolute;
            top: -25px;
            left: 40px;
            width: 60px;
            height: 60px;
            background: var(--gradient);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            font-weight: 700;
            box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
            z-index: 2;
        }
        
        .step-feature-list {
            list-style: none;
            margin: 1.5rem 0;
        }
        
        .step-feature-list li {
            margin-bottom: 0.8rem;
            padding-left: 30px;
            position: relative;
            color: var(--gray);
        }
        
        .step-feature-list li:before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--accent);
            font-weight: bold;
            font-size: 1.2rem;
        }
        
        .step-image {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            position: relative;
            transition: var(--transition);
        }
        
        .step-image:hover {
            transform: scale(1.02);
            box-shadow: var(--shadow-lg);
        }
        
        .step-image:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(45deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
            z-index: 1;
            opacity: 0;
            transition: var(--transition);
        }
        
        .step-image:hover:before {
            opacity: 1;
        }
        
        .step-image img {
            width: 100%;
            height: 350px;
            object-fit: cover;
            display: block;
        }
        
        /* Tool Section */
        .tool-section {
            padding: 80px 0;
            background: linear-gradient(135deg, #f1f5f9 0%, #ffffff 100%);
            position: relative;
            overflow: hidden;
        }
        
        .tool-section:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%232563eb' fill-opacity='0.03' fill-rule='evenodd'/%3E%3C/svg%3E");
            z-index: 0;
        }
        
        .tool-container {
            position: relative;
            z-index: 1;
            background: white;
            border-radius: var(--radius);
            padding: 50px 40px;
            box-shadow: var(--shadow-lg);
            text-align: center;
        }
        
        .tool-features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 25px;
            margin: 40px 0;
        }
        
        .tool-feature {
            padding: 25px;
            background: var(--light);
            border-radius: var(--radius);
            transition: var(--transition);
        }
        
        .tool-feature:hover {
            background: var(--gradient);
            color: white;
            transform: translateY(-5px);
        }
        
        .tool-feature:hover i,
        .tool-feature:hover h4 {
            color: white;
        }
        
        .tool-feature i {
            font-size: 2.2rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }
        
        .tool-feature h4 {
            font-size: 1.2rem;
            margin-bottom: 0.5rem;
        }
        
        /* Final CTA */
        .final-cta {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--dark), #1e293b);
            color: white;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        
        .final-cta:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%23ffffff' fill-opacity='0.05' fill-rule='evenodd'/%3E%3C/svg%3E");
            z-index: 0;
        }
        
        .final-cta .container {
            position: relative;
            z-index: 1;
        }
        
        .final-cta h2 {
            color: white;
        }
        
        .final-cta h2:after {
            background: white;
        }
        
        .final-cta p {
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            margin: 0 auto 2.5rem;
            font-size: 1.2rem;
        }
        
        /* Footer */
        footer {
            background: #0f172a;
            color: white;
            padding: 60px 0 30px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 50px;
        }
        
        .footer-column h3 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        
        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.9rem;
        }
        
        /* Tool Demo */
        .tool-demo {
            background: linear-gradient(135deg, #f8fafc, #ffffff);
            border-radius: var(--radius);
            padding: 30px;
            margin: 40px 0;
            border: 1px solid rgba(226, 232, 240, 0.5);
        }
        
        .demo-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
            margin: 25px 0;
        }
        
        .demo-input {
            padding: 16px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-family: 'Inter', sans-serif;
            transition: var(--transition);
            background: white;
        }
        
        .demo-input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }
        
        /* Responsive Design - Mobile First */
        @media (max-width: 1200px) {
            h1 {
                font-size: 3rem;
            }
            
            h2 {
                font-size: 2.2rem;
            }
            
            .central-image-title {
                font-size: 2rem;
            }
        }
        
        @media (max-width: 992px) {
            h1 {
                font-size: 2.5rem;
            }
            
            h2 {
                font-size: 2rem;
            }
            
            h3 {
                font-size: 1.6rem;
            }
            
            .step {
                grid-template-columns: 1fr;
                gap: 40px;
                margin-bottom: 60px;
            }
            
            .step:nth-child(even) {
                direction: ltr;
            }
            
            .steps-container:before {
                display: none;
            }
            
            .step-number {
                left: 30px;
            }
            
            .step-image img {
                height: 300px;
            }
            
            .central-image-title {
                font-size: 1.8rem;
            }
            
            .central-image-description {
                font-size: 1.1rem;
            }
        }
        
        @media (max-width: 768px) {
            /* Header for Mobile */
            .header-container {
                padding: 0 15px;
            }
            
            .logo-img {
                height: 35px;
                width: 35px;
            }
            
            .logo-text {
                font-size: 1.3rem;
            }
            
            .header-cta {
                padding: 10px 20px;
                font-size: 0.9rem;
                gap: 8px;
            }
            
            .header-cta i {
                font-size: 0.9rem;
            }
            
            /* Author Section */
            .author-content {
                flex-direction: column;
                text-align: center;
                gap: 15px;
            }
            
            .author-info {
                text-align: center;
            }
            
            /* Central Image Section */
            .central-image-section {
                padding: 40px 0;
                margin: 40px 0;
            }
            
            .central-image-title {
                font-size: 1.6rem;
            }
            
            .central-image-description {
                font-size: 1rem;
                padding: 0 15px;
            }
            
            .email-list-image {
                max-width: 95%;
            }
            
            /* Hero */
            .hero {
                padding: 120px 0 60px;
                margin-top: 60px;
            }
            
            .hero-description {
                font-size: 1.1rem;
            }
            
            /* Steps */
            .step-content {
                padding: 30px 20px;
            }
            
            .step-number {
                left: 20px;
                width: 50px;
                height: 50px;
                font-size: 1.5rem;
                top: -20px;
            }
            
            /* Tool Section */
            .tool-container {
                padding: 30px 20px;
            }
            
            .tool-features {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            
            .tool-feature {
                padding: 20px;
            }
            
            /* Stats */
            .stats-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            
            .stat-item {
                padding: 25px;
            }
            
            /* FAQ Section */
            .faq-question {
                font-size: 1.2rem;
            }
            
            .faq-answer {
                font-size: 1rem;
                padding-left: 35px;
            }
            
            .cta-guide-box {
                padding: 30px 20px;
                margin: 40px 0;
            }
            
            .cta-guide-title {
                font-size: 1.6rem;
            }
            
            .cta-guide-text {
                font-size: 1.1rem;
            }
        }
        
        @media (max-width: 576px) {
            h1 {
                font-size: 2rem;
            }
            
            h2 {
                font-size: 1.7rem;
            }
            
            h3 {
                font-size: 1.4rem;
            }
            
            .hero-subtitle {
                font-size: 0.9rem;
                letter-spacing: 1px;
            }
            
            .author-section {
                padding: 20px;
                margin: 1.5rem auto 2rem;
            }
            
            .author-avatar {
                width: 70px;
                height: 70px;
                font-size: 1.8rem;
            }
            
            .author-name {
                font-size: 1.2rem;
            }
            
            .author-title {
                font-size: 0.95rem;
            }
            
            /* Central Image */
            .central-image-section {
                padding: 30px 0;
            }
            
            .central-image-title {
                font-size: 1.4rem;
            }
            
            .central-image-description {
                font-size: 0.95rem;
                margin-bottom: 2rem;
            }
            
            .cta-button {
                padding: 14px 28px;
                font-size: 1rem;
            }
            
            .cta-guide-button {
                padding: 14px 28px;
                font-size: 1rem;
            }
            
            .tool-features {
                grid-template-columns: 1fr;
            }
            
            .demo-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            
            /* Very small screens */
            @media (max-width: 400px) {
                .logo-text {
                    font-size: 1.1rem;
                }
                
                .header-cta {
                    padding: 8px 16px;
                    font-size: 0.85rem;
                }
                
                .header-cta i {
                    display: none;
                }
                
                .step-image img {
                    height: 250px;
                }
                
                .faq-item {
                    padding: 20px 15px;
                }
                
                .faq-question {
                    font-size: 1.1rem;
                }
                
                .faq-answer {
                    padding-left: 30px;
                }
                
                .central-image-title {
                    font-size: 1.3rem;
                }
            }
        }
        
        @media (max-width: 350px) {
            .logo {
                gap: 8px;
            }
            
            .logo-text {
                font-size: 1rem;
            }
            
            .header-cta {
                padding: 8px 14px;
                font-size: 0.8rem;
            }
            
            .author-avatar {
                width: 60px;
                height: 60px;
                font-size: 1.5rem;
            }
            
            .faq-question {
                font-size: 1rem;
            }
            
            .faq-answer {
                font-size: 0.95rem;
                padding-left: 25px;
            }
        }
        
        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .animate {
            animation: fadeInUp 0.8s ease forwards;
        }
        
        .delay-1 {
            animation-delay: 0.2s;
        }
        
        .delay-2 {
            animation-delay: 0.4s;
        }
        
        .delay-3 {
            animation-delay: 0.6s;
        }