:root {
            --primary-color: #1a3a6c;
            /* Azul marino */
            --primary-light: #2c5282;
            --primary-dark: #0a2a52;
            --secondary-color: #2c3e50;
            --accent-color: #38b2ac;
            /* Turquesa para acentos */
            --light-color: #f8f9fa;
            --dark-color: #1a1a1a;
            --gray-light: #e9ecef;
            --gradient-color: linear-gradient(135deg, #1a3a6c, #0a2a52);
            --gradient-light: linear-gradient(135deg, #e3eaf7, #d0ddf1);
            --font-heading: 'Montserrat', sans-serif;
            --font-body: 'Roboto', sans-serif;
            --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.1);
            --shadow-md: 0 8px 15px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 15px 25px rgba(0, 0, 0, 0.15);
            --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }
        
        html {
            scroll-behavior: smooth;
        }
        
        body {
            font-family: var(--font-body);
            color: var(--secondary-color);
            margin: 0;
            background-color: var(--light-color);
            overflow-x: hidden;
            line-height: 1.6;
        }
        /* Parallax Container */
        
        .parallax-container {
            position: relative;
            overflow: hidden;
            height: 100vh;
        }
        
        .parallax-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 120%;
            /* background-image: url('https://checkextintor.com/assets/img/background.jpgimages.unsplash.com/photo-1587731556938-38755b4803a6?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2078&q=80'); */
            background-image: url('https://checkextintor.com/images/background.jpg');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            filter: grayscale(30%) brightness(70%);
            z-index: -1;
            transform: translateZ(0);
        }
        /* Navbar */
        
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background-color: transparent;
            padding: 1.5rem 0;
            transition: background-color 0.4s ease, padding 0.4s ease;
        }
        
        .navbar.scrolled {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: var(--shadow-sm);
            padding: 1rem 0;
            backdrop-filter: blur(10px);
        }
        
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }
        
        .nav-logo {
            font-family: var(--font-heading);
            font-weight: 800;
            font-size: 1.8rem;
            color: white;
            text-decoration: none;
            transition: color 0.4s ease;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .nav-logo i {
            color: var(--accent-color);
        }
        
        .navbar.scrolled .nav-logo {
            color: var(--primary-color);
        }
        
        .nav-links {
            display: flex;
            gap: 2rem;
        }
        
        .nav-links a {
            color: white;
            text-decoration: none;
            font-family: var(--font-heading);
            font-weight: 600;
            font-size: 0.95rem;
            position: relative;
            transition: color 0.3s ease;
            padding: 0.5rem 0;
        }
        
        .navbar.scrolled .nav-links a {
            color: var(--primary-color);
        }
        
        .nav-links a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: var(--accent-color);
            transition: width 0.3s ease;
        }
        
        .nav-links a:hover::after {
            width: 100%;
        }
        
        .nav-cta {
            background-color: var(--accent-color);
            color: white;
            padding: 0.7rem 1.5rem;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--transition);
            margin-left: 1.5rem;
        }
        
        .nav-cta:hover {
            background-color: #2d9c96;
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        /* Mobile menu */
        
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            z-index: 1100;
        }
        
        .bar {
            width: 25px;
            height: 3px;
            background-color: white;
            margin: 4px 0;
            transition: all 0.3s ease;
            border-radius: 2px;
        }
        
        .navbar.scrolled .bar {
            background-color: var(--primary-color);
        }
        
        .mobile-menu {
            position: fixed;
            top: 0;
            right: -300px;
            width: 280px;
            height: 100vh;
            background-color: white;
            z-index: 1050;
            box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
            transition: right 0.4s ease;
            padding: 6rem 2rem 2rem;
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        
        .mobile-menu.active {
            right: 0;
        }
        
        .mobile-menu a {
            color: var(--primary-color);
            text-decoration: none;
            font-family: var(--font-heading);
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 1px solid var(--gray-light);
        }
        
        .mobile-menu .nav-cta {
            margin-top: 1rem;
            text-align: center;
            background-color: var(--primary-color);
        }
        
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1040;
            display: none;
        }
        
        .overlay.active {
            display: block;
        }
        /* Hero Section */
        
        .hero {
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: white;
            position: relative;
            overflow: hidden;
            padding: 0 2rem;
        }
        
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 900px;
        }
        
        .hero-content h1 {
            font-family: var(--font-heading);
            font-size: 4rem;
            font-weight: 800;
            margin: 0;
            animation: fadeInDown 1s ease-in-out;
            line-height: 1.1;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        }
        
        .hero-content p {
            font-size: 1.5rem;
            margin-top: 1.5rem;
            max-width: 700px;
            line-height: 1.6;
            animation: fadeInUp 1s ease-in-out;
            animation-delay: 0.3s;
            opacity: 0.9;
            font-weight: 300;
        }
        
        .hero-cta {
            margin-top: 3rem;
            animation: zoomIn 1s ease-in-out;
            animation-delay: 0.6s;
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        
        .hero-cta a {
            background-color: white;
            color: var(--primary-color);
            text-decoration: none;
            padding: 1rem 2.5rem;
            border-radius: 50px;
            font-family: var(--font-heading);
            font-weight: 700;
            letter-spacing: 0.5px;
            transition: var(--transition);
            box-shadow: var(--shadow-md);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .hero-cta a:first-child {
            background: var(--gradient-color);
            color: white;
        }
        
        .hero-cta a:hover {
            transform: translateY(-5px) scale(1.05);
            box-shadow: var(--shadow-lg);
        }
        
        .scroll-down {
            position: absolute;
            bottom: 2rem;
            left: 50%;
            transform: translateX(-50%);
            color: white;
            font-size: 2rem;
            animation: bounce 2s infinite;
            cursor: pointer;
            z-index: 10;
        }
        /* Common styles */
        
        .section {
            padding: 8rem 2rem;
            max-width: 1200px;
            margin: 0 auto;
            opacity: 0;
            transform: translateY(50px);
            transition: opacity 0.8s ease, transform 0.8s ease;
            position: relative;
        }
        
        .section.visible {
            opacity: 1;
            transform: translateY(0);
        }
        
        .section-title {
            font-family: var(--font-heading);
            font-size: 2.8rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 5rem;
            color: var(--primary-color);
            position: relative;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--accent-color);
            border-radius: 2px;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }
        /* Acerca de Section */
        
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }
        
        .about-image {
            position: relative;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            transform: perspective(1000px) rotateY(-5deg);
            transition: var(--transition);
        }
        
        .about-image:hover {
            transform: perspective(1000px) rotateY(0deg);
        }
        
        .about-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
        }
        
        .about-image:hover img {
            transform: scale(1.05);
        }
        
        .about-content h3 {
            font-family: var(--font-heading);
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            color: var(--primary-color);
        }
        
        .about-content p {
            font-size: 1.1rem;
            line-height: 1.8;
            margin-bottom: 1.5rem;
        }
        
        .about-features {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
            margin-top: 2rem;
        }
        
        .about-feature {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
        }
        
        .about-feature i {
            color: var(--accent-color);
            font-size: 1.5rem;
            min-width: 30px;
        }
        /* Ventajas Section */
        
        #ventajas {
            background-color: var(--light-color);
            position: relative;
            overflow: hidden;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2.5rem;
            text-align: center;
        }
        
        .feature-item {
            padding: 2.5rem 2rem;
            background-color: white;
            border-radius: 15px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            z-index: 1;
        }
        
        .feature-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 0;
            background: var(--gradient-light);
            z-index: -1;
            transition: height 0.5s ease;
        }
        
        .feature-item:hover::before {
            height: 100%;
        }
        
        .feature-item:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }
        
        .feature-icon {
            font-size: 3.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            transition: var(--transition);
        }
        
        .feature-item:hover .feature-icon {
            transform: scale(1.1);
        }
        
        .feature-item h4 {
            font-family: var(--font-heading);
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--primary-dark);
        }
        
        .feature-item p {
            font-size: 1rem;
            color: #555;
        }
        /* Cómo Funciona Section */
        
        #como-funciona {
            background: linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.9)), url('https://images.unsplash.com/photo-1556911220-ef412ae179a9?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1974&q=80');
            background-size: cover;
            background-attachment: fixed;
            background-position: center;
        }
        
        .how-it-works-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 3rem;
            text-align: center;
            position: relative;
        }
        
        .how-it-works-grid::before {
            content: '';
            position: absolute;
            top: 30%;
            left: 50%;
            transform: translateX(-50%);
            width: 80%;
            height: 2px;
            background-color: #ddd;
            z-index: 0;
        }
        
        .step {
            position: relative;
            background: white;
            padding: 2.5rem 2rem;
            border-radius: 15px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        
        .step:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }
        
        .step-number {
            width: 70px;
            height: 70px;
            background: var(--gradient-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-family: var(--font-heading);
            font-size: 1.8rem;
            font-weight: 700;
            box-shadow: var(--shadow-md);
            transition: var(--transition);
        }
        
        .step:hover .step-number {
            transform: scale(1.1) rotate(5deg);
        }
        
        .step h4 {
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.3rem;
            margin-bottom: 1rem;
            color: var(--primary-dark);
        }
        
        .step p {
            color: #555;
        }
        /* Precios Section */
        
        #precios {
            background-color: var(--primary-color);
            color: white;
        }
        
        #precios .section-title {
            color: white;
        }
        
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2.5rem;
        }
        
        .pricing-card {
            background: rgba(255, 255, 255, 0.1);
            border-radius: 15px;
            padding: 3rem 2rem;
            text-align: center;
            transition: var(--transition);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            position: relative;
            overflow: hidden;
        }
        
        .pricing-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: var(--gradient-color);
        }
        
        .pricing-card.popular {
            transform: scale(1.05);
            background: rgba(255, 255, 255, 0.15);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        }
        
        .pricing-card.popular::before {
            height: 8px;
            background: var(--accent-color);
        }
        
        .pricing-card.popular .popular-tag {
            display: block;
        }
        
        .popular-tag {
            position: absolute;
            top: 20px;
            right: -35px;
            background: var(--accent-color);
            color: white;
            padding: 0.3rem 2.5rem;
            font-size: 0.8rem;
            font-weight: 600;
            transform: rotate(45deg);
            display: none;
        }
        
        .pricing-card h3 {
            font-family: var(--font-heading);
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
        }
        
        .price {
            font-family: var(--font-heading);
            font-size: 3.5rem;
            font-weight: 700;
            margin: 1.5rem 0;
        }
        
        .price small {
            font-size: 1rem;
            font-weight: 400;
            opacity: 0.8;
        }
        
        .pricing-features {
            list-style: none;
            padding: 0;
            margin: 2rem 0;
            text-align: left;
        }
        
        .pricing-features li {
            padding: 0.8rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }
        
        .pricing-features li i {
            color: var(--accent-color);
        }
        
        .pricing-features li.disabled {
            opacity: 0.5;
        }
        
        .pricing-cta {
            display: block;
            background: var(--accent-color);
            color: white;
            text-decoration: none;
            padding: 1rem;
            border-radius: 50px;
            font-family: var(--font-heading);
            font-weight: 600;
            margin-top: 1.5rem;
            transition: var(--transition);
        }
        
        .pricing-cta:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
        }
        
        .pricing-card.popular .pricing-cta {
            background: white;
            color: var(--primary-color);
        }
        /* Contacto Section */
        
        .contact-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }
        
        .contact-info {
            background: var(--gradient-color);
            padding: 3rem;
            border-radius: 15px;
            color: white;
            box-shadow: var(--shadow-lg);
        }
        
        .contact-info h3 {
            font-family: var(--font-heading);
            font-size: 1.8rem;
            margin-bottom: 2rem;
            position: relative;
        }
        
        .contact-info h3::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 3px;
            background-color: var(--accent-color);
        }
        
        .contact-details {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        
        .contact-item {
            display: flex;
            align-items: flex-start;
            gap: 1.2rem;
        }
        
        .contact-item i {
            font-size: 1.3rem;
            color: var(--accent-color);
            min-width: 30px;
        }
        
        .contact-form {
            background-color: white;
            padding: 3rem;
            border-radius: 15px;
            box-shadow: var(--shadow-lg);
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
            color: var(--primary-dark);
        }
        
        .form-control {
            width: 100%;
            padding: 1rem;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-family: var(--font-body);
            transition: border-color 0.3s ease;
            font-size: 1rem;
        }
        
        .form-control:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(56, 178, 172, 0.2);
        }
        
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        
        .btn-submit {
            display: block;
            width: 100%;
            background: var(--gradient-color);
            color: white;
            border: none;
            padding: 1.2rem;
            border-radius: 50px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        
        .btn-submit:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        /* WhatsApp Button */
        
        .whatsapp-button {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 60px;
            height: 60px;
            background-color: #25D366;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            box-shadow: var(--shadow-lg);
            z-index: 100;
            transition: var(--transition);
        }
        
        .whatsapp-button:hover {
            transform: scale(1.1) rotate(10deg);
        }
        /* Footer */
        
        .footer {
            background-color: var(--primary-dark);
            color: var(--light-color);
            padding: 5rem 0 2rem;
            position: relative;
            overflow: hidden;
        }
        
        .footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: var(--accent-color);
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 3rem;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }
        
        .footer-column h3 {
            font-family: var(--font-heading);
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
            position: relative;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 40px;
            height: 3px;
            background-color: var(--accent-color);
        }
        
        .footer-logo {
            font-family: var(--font-heading);
            font-weight: 800;
            font-size: 1.8rem;
            color: white;
            text-decoration: none;
            display: inline-block;
            margin-bottom: 1.5rem;
        }
        
        .footer-about p {
            opacity: 0.8;
            margin-bottom: 1.5rem;
        }
        
        .social-icons {
            display: flex;
            gap: 1rem;
        }
        
        .social-icons a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            color: white;
            border-radius: 50%;
            transition: var(--transition);
        }
        
        .social-icons a:hover {
            background-color: var(--accent-color);
            transform: translateY(-3px);
        }
        
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        
        .footer-links a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .footer-links a:hover {
            color: var(--accent-color);
            transform: translateX(5px);
        }
        
        .footer-contact li {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            margin-bottom: 1.2rem;
        }
        
        .footer-contact i {
            color: var(--accent-color);
            font-size: 1.2rem;
            min-width: 20px;
        }
        
        .copyright {
            text-align: center;
            padding: 2rem 0 0;
            margin-top: 3rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            opacity: 0.7;
        }
        /* Animations */
        
        @keyframes fadeInDown {
            from {
                opacity: 0;
                transform: translateY(-30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        @keyframes zoomIn {
            from {
                opacity: 0;
                transform: scale(0.8);
            }
            to {
                opacity: 1;
                transform: scale(1);
            }
        }
        
        @keyframes bounce {
            0%,
            20%,
            50%,
            80%,
            100% {
                transform: translateY(0);
            }
            40% {
                transform: translateY(-20px);
            }
            60% {
                transform: translateY(-10px);
            }
        }
        /* Media Queries para Responsividad */
        
        @media (max-width: 992px) {
            .about-grid {
                grid-template-columns: 1fr;
                gap: 3rem;
            }
            .features-grid,
            .how-it-works-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .pricing-grid,
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
            }
            .contact-container {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 2.4rem;
            }
            .hero-content h1 {
                font-size: 3.2rem;
            }
        }
        
        @media (max-width: 768px) {
            .nav-links,
            .nav-cta {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .hero-content h1 {
                font-size: 2.5rem;
            }
            .hero-content p {
                font-size: 1.2rem;
            }
            .features-grid,
            .how-it-works-grid,
            .pricing-grid {
                grid-template-columns: 1fr;
            }
            .pricing-card.popular {
                transform: scale(1);
            }
            .footer-content {
                grid-template-columns: 1fr;
                gap: 2.5rem;
            }
            .section {
                padding: 6rem 1.5rem;
            }
            .contact-form,
            .contact-info {
                padding: 2rem;
            }
        }
        
        @media (max-width: 576px) {
            .hero-cta {
                flex-direction: column;
                gap: 1rem;
            }
            .hero-cta a {
                width: 100%;
                justify-content: center;
            }
            .about-features {
                grid-template-columns: 1fr;
            }
        }