:root {
            --main-azure: #1a3a5f; 
            --brand-red: #e63946; 
            --brand-green: #25d366; 
            --brand-yellow: #ffb703;
            --bg-azure-light: #f8fbff;
            --white: #ffffff;
        }

        * { 
            margin: 0; 
            padding: 0; 
            box-sizing: border-box; 
        }
        
        body { 
            font-family: 'Poppins', sans-serif; 
            background-color: var(--bg-azure-light); 
            color: #1d1e2c; 
            line-height: 1.6; 
            scroll-behavior: smooth; 
            font-weight: 400;
            overflow-x: hidden; /* Evita scroll horizontal */
        }

        h1, h2, h3, h4, .nav-phone, .btn-submit { 
            font-weight: 800 !important; 
        }

        /* ANIMACIÓN DE PARPADEO / PULSO */
        @keyframes pulse-green {
            0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7); }
            70% { transform: scale(1.05); box-shadow: 0 0 0 10px rgba(37, 211, 102, 0); }
            100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
        }

        /* NAVEGACIÓN */
        nav { 
            background: rgba(255, 255, 255, 0.95); 
            backdrop-filter: blur(10px);
            padding: 10px 5%; 
            display: flex; 
            justify-content: space-between; 
            align-items: center; 
            position: sticky; 
            top: 0; 
            z-index: 1000; 
            box-shadow: 0 4px 15px rgba(0,0,0,0.1); 
        }

        .logo-house { position: relative; display: flex; align-items: center; overflow: hidden; border-radius: 8px; }
        .logo-img { height: 45px; width: auto; transition: transform 0.3s ease; } /* Tamaño ajustable para móvil */

        .logo-house::after {
            content: ""; position: absolute; top: 0; left: -150%; width: 50%; height: 100%;
            background: linear-gradient(to right, transparent, rgba(255,255,255,0.8), transparent);
            transform: skewX(-25deg); animation: shine 4s infinite;
        }

        @keyframes shine { 10% { left: 150%; } 100% { left: 150%; } }

        /* NÚMERO DE CELULAR */
        .nav-phone { 
            background: var(--brand-green); 
            color: white; 
            padding: 8px 15px; 
            border-radius: 50px; 
            text-decoration: none; 
            font-size: 0.8rem;
            transition: 0.3s ease;
            animation: pulse-green 2s infinite;
            white-space: nowrap;
        }

        /* BIENVENIDA / HERO */
        section { padding: 60px 5%; text-align: center; }
        .section-title { font-size: 1.8rem; color: var(--main-azure); margin-bottom: 10px; text-transform: uppercase; }
        .title-underline { width: 60px; height: 5px; background: var(--brand-red); margin: 0 auto 40px; border-radius: 10px; }
        
        .bienvenida { 
            position: relative; 
            padding: 100px 5%; 
            background: url('img/mantenimientonevera.webp') no-repeat center center/cover; 
            color: white; 
            min-height: 70vh;
            display: flex;
            align-items: center;
        }
        .bienvenida::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(13, 27, 42, 0.75); z-index: 1; }
        .bienvenida-content { position: relative; z-index: 2; width: 100%; }
        .bienvenida .section-title { color: white; font-size: 2.2rem; }
        .welcome-text { max-width: 800px; margin: 0 auto 30px; font-size: 1.1rem; min-height: 60px; font-weight: 400; }

        .cta-hero {
            display: inline-block;
            background: var(--brand-green);
            color: white;
            padding: 15px 30px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 800;
            font-size: 1rem;
            box-shadow: 0 10px 20px rgba(37, 211, 102, 0.4);
            transition: 0.3s;
        }

        /* MARCAS SLIDER */
        .marcas-seccion { background: #fff; padding: 40px 0; overflow: hidden; }
        .slider-track { display: flex; width: calc(150px * 12); animation: scroll-marcas 25s linear infinite; }
        .slide { width: 150px; padding: 0 20px; }
        .slide img { width: 100px; height: 50px; object-fit: contain; filter: grayscale(100%); opacity: 0.5; }

        @keyframes scroll-marcas { 0% { transform: translateX(0); } 100% { transform: translateX(calc(-150px * 6)); } }

        /* GRIDS RESPONSIVOS (Servicios, Ventajas, Testimonios) */
        .tipos-grid { 
            display: grid; 
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); 
            gap: 20px; 
        }

        .servicios-tipos { background: var(--main-azure); color: white; border-radius: 40px 40px 0 0; }
        .servicios-tipos .section-title { color: white; }
        .tipo-card { padding: 30px; border-radius: 25px; background: rgba(255,255,255,0.08); transition: 0.3s; border: 1px solid rgba(255,255,255,0.1); }
        .tipo-card i { font-size: 2.5rem; color: var(--brand-red); margin-bottom: 20px; }

        /* GALERIA RESPONSIVA */
        .galeria-grid { 
            display: grid; 
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); 
            gap: 15px; 
        }
        .galeria-item { height: 250px; border-radius: 20px; overflow: hidden; position: relative; }
        .galeria-item img { width: 100%; height: 100%; object-fit: cover; }
        .galeria-label { position: absolute; bottom: 0; background: linear-gradient(transparent, rgba(26, 58, 95, 0.95)); color: white; width: 100%; padding: 30px 15px 15px; text-align: left; font-weight: 600; font-size: 0.9rem; }

        /* TESTIMONIOS Y VENTAJAS */
        .card-blanca { background: white; padding: 25px; border-radius: 20px; box-shadow: 0 10px 30px rgba(0,0,0,0.05); text-align: left; }
        .ventaja-item { padding: 20px; }
        .ventaja-item i { font-size: 2.5rem; color: var(--brand-red); margin-bottom: 15px; }

        /* PAGOS */
        .pagos-grid { display: flex; justify-content: center; gap: 15px; flex-wrap: wrap; }
        .pago-item { padding: 20px; border-radius: 15px; width: 100%; max-width: 250px; color: white; font-weight: 700 !important; }

        /* FORMULARIO */
        .form-wrapper { max-width: 600px; margin: 0 auto; background: var(--white); padding: 25px; border-radius: 25px; box-shadow: 0 15px 35px rgba(0,0,0,0.1); border-top: 5px solid var(--brand-red); }
        input, select, textarea { width: 100%; padding: 14px; margin-bottom: 15px; border: 2px solid #eee; border-radius: 10px; font-family: inherit; font-size: 16px; /* Evita zoom en iOS */ }

        /* WHATSAPP FLOAT */
        .float-wa { position: fixed; bottom: 20px; right: 20px; background: #25d366; width: 55px; height: 55px; border-radius: 50%; display: flex; justify-content: center; align-items: center; color: white; font-size: 30px; z-index: 2000; text-decoration: none; animation: pulse-green 2s infinite; }
        .wa-status { position: absolute; top: -15px; right: 0; background: white; color: #25d366; font-size: 0.6rem; padding: 2px 8px; border-radius: 10px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); font-weight: 600; }

        /* --- MEDIA QUERIES PARA COMPUTADOR (PANTALLAS GRANDES) --- */
        @media (min-width: 768px) {
            .logo-img { height: 60px; }
            .nav-phone { font-size: 0.9rem; padding: 12px 25px; }
            .section-title { font-size: 2.2rem; }
            .bienvenida .section-title { font-size: 3.5rem; }
            .welcome-text { font-size: 1.3rem; }
            .galeria-grid { grid-template-columns: repeat(4, 1fr); }
            .galeria-item { height: 320px; }
            .pago-item { width: 220px; }
            .form-wrapper { padding: 40px; }
            section { padding: 80px 8%; }
        }

        footer { padding: 40px 5%; background: #0a141e; color: white; text-align: center; }



        .btn-submit {
    background: linear-gradient(135deg, #25d366, #1ebe5d);
    color: white;
    font-size: 18px;
    font-weight: 600;
    padding: 14px 20px;
    border: none;
    border-radius: 10px;
    width: 100%;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

/* Hover (cuando pasan el mouse) */
.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(37, 211, 102, 0.6);
    background: linear-gradient(135deg, #1ebe5d, #25d366);
}

/* Click (feedback visual) */
.btn-submit:active {
    transform: scale(0.98);
}

/* Animación sutil */
.btn-submit::after {
    content: '📲';
    font-size: 18px;
}