/* ==========================================================================
           1. SISTEMA DE DISEÑO (BRANDING ARTE EN LINK + TOQUE MASCULINO)
           ========================================================================== */
        :root {
            /* Base Corporativa de ArteEnLink */
            --color-fondo: #FAF6F0; /* Beige cálido */
            --color-seccion-clara: #F0EBE1; 
            --color-texto-principal: #0A192F; 
            --color-texto-secundario: #4A5568; 
            
            /* Acento Masculino (Reemplaza al Rose Gold): Azul Zafiro / Carbón */
            --color-acento-masculino: #1E3A8A; /* Azul profundo elegante */
            --color-acento-hover: #1E40AF;
            --color-acento-secundario: #DBEAFE; /* Azul muy claro para fondos de iconos */
            --color-glow-tech: #0EA5E9; /* Cyan para el brillo premium */
            
            --fuente-titulos: 'Playfair Display', serif;
            --fuente-textos: 'Poppins', sans-serif;
            
            /* Sombras Fijas */
            --sombra-suave: 0 10px 30px rgba(10, 25, 47, 0.05);
            --sombra-fuerte: 0 20px 40px rgba(30, 58, 138, 0.15);
            
            --borde-radio: 16px;
        }

        /* ==========================================================================
           2. RESET Y ESTILOS GLOBALES (CRÍTICO: JITTER FIX)
           ========================================================================== */
        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        
        body { 
            font-family: var(--fuente-textos); 
            background-color: var(--color-fondo); 
            color: var(--color-texto-principal); 
            line-height: 1.6; 
            overflow-x: hidden; 
            /* LA REGLA DE ORO: Fuentes nítidas siempre */
            -webkit-font-smoothing: antialiased; 
            -moz-osx-font-smoothing: grayscale; 
        }

        h1, h2, h3, h4 { font-family: var(--fuente-titulos); color: var(--color-texto-principal); }
        p { color: var(--color-texto-secundario); font-size: 1rem; }
        a { text-decoration: none; color: inherit; }
        
        .contenedor { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 5%; }
        .seccion-padding { padding: 80px 0; }

        /* --- PRELOADER CORPORATIVO --- */
        #preloader { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: var(--color-fondo); z-index: 99999; display: flex; flex-direction: column; justify-content: center; align-items: center; transition: opacity 0.6s ease, visibility 0.6s ease; }
        #preloader.oculto { opacity: 0; visibility: hidden; }
        .loader-logo { font-family: var(--fuente-titulos); font-size: 2.5rem; font-weight: 700; color: var(--color-texto-principal); margin-bottom: 20px; animation: pulse 1.5s infinite ease-in-out; }
        .loader-logo span { color: var(--color-acento-masculino); font-style: italic; }
        .loader-spinner { width: 40px; height: 40px; border: 3px solid var(--color-acento-secundario); border-top: 3px solid var(--color-acento-masculino); border-radius: 50%; animation: spin 1s linear infinite; }
        
        @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
        @keyframes pulse { 0%, 100% { opacity: 1; transform: translate3d(0,0,0); } 50% { opacity: 0.7; transform: translate3d(0,-2px,0); } }

        /* --- CLASES DE ANIMACIÓN AL SCROLL --- */
        .animar-oculto { opacity: 0; transform: translate3d(0, 40px, 0); transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1); }
        .animar-visible { opacity: 1; transform: translate3d(0, 0, 0); }
        .delay-1 { transition-delay: 100ms; } .delay-2 { transition-delay: 200ms; } .delay-3 { transition-delay: 300ms; }

        /* ==========================================================================
           3. BOTONES (ESTILO ARTEENLINK)
           ========================================================================== */
        .btn-principal { display: inline-flex; justify-content: center; align-items: center; gap: 8px; background-color: var(--color-acento-masculino); color: #FFFFFF; padding: 12px 24px; border-radius: 50px; font-size: 0.95rem; font-weight: 500; transition: transform 0.3s ease, box-shadow 0.3s ease; border: none; cursor: pointer; text-align: center; box-shadow: 0 4px 15px rgba(30, 58, 138, 0.2); }
        .btn-principal:hover { background-color: var(--color-acento-hover); transform: translate3d(0, -3px, 0); box-shadow: 0 6px 20px rgba(30, 58, 138, 0.3); color: #FFFFFF; } /* NO SCALE */
        
        .btn-secundario { display: inline-flex; justify-content: center; align-items: center; gap: 8px; background-color: transparent; color: var(--color-texto-principal); padding: 10px 24px; border-radius: 50px; font-size: 0.95rem; font-weight: 500; border: 2px solid var(--color-texto-principal); transition: all 0.3s ease; text-align: center; }
        .btn-secundario:hover { background-color: var(--color-texto-principal); color: #FFFFFF; transform: translate3d(0, -3px, 0); }

        .btn-premium { display: inline-flex; justify-content: center; align-items: center; gap: 8px; background-color: transparent; color: var(--color-acento-masculino); padding: 12px 24px; border-radius: 50px; font-size: 0.95rem; font-weight: 500; border: 2px solid var(--color-acento-masculino); transition: all 0.3s ease; text-align: center; }
        .btn-premium:hover { background-color: var(--color-acento-masculino); color: #FFFFFF; transform: translate3d(0, -3px, 0); box-shadow: 0 6px 20px rgba(30, 58, 138, 0.3); }

        .btn-whatsapp { display: flex; align-items: center; justify-content: center; gap: 8px; background-color: #25D366; color: white; padding: 12px 24px; border-radius: 50px; font-weight: 600; font-size: 0.95rem; transition: transform 0.3s ease, box-shadow 0.3s ease; box-shadow: 0 4px 15px rgba(37, 211, 102, 0.3); }
        .btn-whatsapp:hover { background-color: #128C7E; transform: translate3d(0, -3px, 0); box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4); color: white; }

        /* ==========================================================================
           4. CABECERA
           ========================================================================== */
        header { position: fixed; top: 0; left: 0; width: 100%; background-color: rgba(250, 246, 240, 0.95); backdrop-filter: blur(10px); z-index: 1000; box-shadow: 0 2px 15px rgba(0,0,0,0.03); padding: 15px 0; transition: all 0.3s ease; }
        .nav-container { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; padding: 0 5%; }
        .logo { font-family: var(--fuente-titulos); font-size: 1.8rem; font-weight: 700; color: var(--color-texto-principal); letter-spacing: -0.5px; }
        .logo span { color: var(--color-acento-masculino); font-style: italic; }
        .volver-inicio { display: flex; align-items: center; gap: 8px; font-weight: 500; font-size: 0.95rem; transition: color 0.3s; }
        .volver-inicio:hover { color: var(--color-acento-masculino); }

        /* ==========================================================================
           5. HERO DE CATEGORÍA
           ========================================================================== */
        .hero-categoria { padding-top: 140px; padding-bottom: 40px; text-align: center; position: relative; }
        .hero-categoria h1 { font-size: 3.5rem; margin-bottom: 15px; }
        .hero-categoria p { font-size: 1.1rem; max-width: 600px; margin: 0 auto; margin-bottom: 30px; }
        
        .alerta-personalizacion {
            background-color: var(--color-seccion-clara);
            border: 1px solid rgba(30, 58, 138, 0.1);
            border-left: 4px solid var(--color-acento-masculino);
            padding: 20px 30px;
            border-radius: 0 12px 12px 0;
            display: inline-flex;
            align-items: center;
            gap: 15px;
            max-width: 800px;
            margin: 0 auto;
            text-align: left;
            box-shadow: var(--sombra-suave);
        }
        .alerta-personalizacion i { font-size: 2rem; color: var(--color-acento-masculino); }
        .alerta-personalizacion p { margin: 0; font-size: 0.95rem; color: var(--color-texto-principal); }

        /* ==========================================================================
           6. ESCAPARATE VIP (LOS 3 CELULARES - MOBILE FIRST)
           ========================================================================== */
        .escaparate-vip { padding: 60px 0; }
        .grid-celulares { display: grid; grid-template-columns: 1fr; gap: 60px; justify-items: center; align-items: end; }
        
        .columna-modelo { display: flex; flex-direction: column; align-items: center; width: 100%; max-width: 320px; }
        .etiqueta-nivel { font-family: var(--fuente-titulos); font-size: 1.5rem; margin-bottom: 20px; color: var(--color-texto-principal); font-weight: 600; }
        
        /* Estructura Base del Celular */
        .celular-demo {
            background: #000; border-radius: 40px; border: 10px solid var(--color-texto-principal);
            overflow: hidden; box-shadow: var(--sombra-suave); position: relative; width: 100%; aspect-ratio: 9/19;
            margin-bottom: 25px; 
            /* Aceleración por hardware forzada */
            will-change: transform; -webkit-backface-visibility: hidden; backface-visibility: hidden; transform-style: preserve-3d;
        }
        
        /* Notch (Cámara) */
        .celular-demo::before { content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 120px; height: 25px; background-color: var(--color-texto-principal); border-bottom-left-radius: 15px; border-bottom-right-radius: 15px; z-index: 10; }
        
        /* Imagen del Demo (Oscura/Tech por ser para hombres) */
        .celular-demo img { width: 100%; height: 100%; object-fit: cover; transition: filter 0.8s ease; }
        .celular-demo:hover img { filter: brightness(1.15) contrast(1.1); } /* En lugar de scale, usamos filter para hover interactivo */

        /* --- ANIMACIONES FLUIDAS (CERO SCALE) --- */
        
        /* 1. BÁSICO */
        .celular-basico { animation: flotarBasico 5s ease-in-out infinite; }
        @keyframes flotarBasico { 0%, 100% { transform: translate3d(0, 0, 0); } 50% { transform: translate3d(0, -10px, 0); } }
        
        /* 2. INTERMEDIO (Acento Masculino) */
        .celular-intermedio { border-color: var(--color-acento-masculino); box-shadow: 0 15px 35px rgba(30, 58, 138, 0.2); animation: flotarInter 4.5s ease-in-out 0.5s infinite; }
        .celular-intermedio::before { background-color: var(--color-acento-masculino); }
        @keyframes flotarInter { 0%, 100% { transform: translate3d(0, 0, 0); } 50% { transform: translate3d(0, -12px, 0); } }
        
        /* 3. PREMIUM (Dark Mode interior con Glow animando Opacity) */
        .celular-premium { background: #0A192F; border-color: #0A192F; animation: flotarPremium 4s ease-in-out 1s infinite; position: relative; }
        .celular-premium::before { background-color: #0A192F; }
        
        /* GLOW EXTERIOR PREMIUM (Animando solo opacidad, sin scale) */
        .celular-premium::after { 
            content: ''; position: absolute; inset: -10px; border-radius: 45px; 
            box-shadow: 0 0 40px rgba(14, 165, 233, 0.6); /* Glow Cyan/Azul */
            z-index: -1; opacity: 0.4; pointer-events: none;
            animation: respirarGlowPremium 3s ease-in-out infinite alternate;
        }
        
        @keyframes flotarPremium { 0%, 100% { transform: translate3d(0, 0, 0); } 50% { transform: translate3d(0, -15px, 0); } }
        @keyframes respirarGlowPremium { 0% { opacity: 0.3; } 100% { opacity: 0.8; } }

        .acciones-modelo { display: flex; flex-direction: column; gap: 12px; width: 100%; }

        /* ==========================================================================
           7. PASOS DE COMPRA
           ========================================================================== */
        .pasos-compra { margin-top: 60px; padding-top: 60px; border-top: 1px solid rgba(0,0,0,0.05); }
        .pasos-header { text-align: center; margin-bottom: 40px; }
        .pasos-header h2 { font-size: 2.2rem; margin-bottom: 10px; }
        
        .pasos-grid { display: grid; grid-template-columns: 1fr; gap: 25px; }
        
        .paso-card { background: #FFFFFF; padding: 30px 25px; border-radius: var(--borde-radio); box-shadow: var(--sombra-suave); position: relative; transition: transform 0.3s ease, border-color 0.3s ease; border-top: 3px solid transparent; }
        .paso-card:hover { transform: translate3d(0, -5px, 0); border-top-color: var(--color-acento-masculino); }
        .paso-numero { width: 45px; height: 45px; background: var(--color-acento-secundario); color: var(--color-acento-masculino); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-family: var(--fuente-titulos); font-size: 1.5rem; font-weight: bold; margin-bottom: 20px; }
        .paso-card h3 { font-size: 1.1rem; margin-bottom: 10px; color: var(--color-texto-principal); }
        .paso-card p { font-size: 0.9rem; }

        /* ==========================================================================
           8. PAQUETES Y PRECIOS (Detalle XV Años Hombres)
           ========================================================================== */
        .precios { background-color: var(--color-seccion-clara); }
        .precios-grid { display: grid; grid-template-columns: 1fr; align-items: center; gap: 30px; margin-top: 40px; }
        
        .precio-card { background: var(--color-fondo); border-radius: var(--borde-radio); padding: 40px 30px; width: 100%; text-align: center; box-shadow: var(--sombra-suave); position: relative; transition: transform 0.3s ease; border: 2px solid transparent; }
        .precio-card:hover { transform: translate3d(0, -10px, 0); }
        
        .precio-card.popular { border-color: var(--color-acento-masculino); box-shadow: var(--sombra-fuerte); z-index: 2; }
        
        /* Tarjeta Premium - Conservamos el fondo oscuro elegante, pero con acentos azules/cyan */
        .precio-card.premium { background: linear-gradient(135deg, var(--color-texto-principal) 0%, #112240 100%); color: #FFFFFF; border: 1px solid rgba(30, 58, 138, 0.5); z-index: 1; position: relative; will-change: transform, box-shadow; -webkit-backface-visibility: hidden; backface-visibility: hidden; transform-style: preserve-3d; transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.25s ease; }
        
        /* Efecto de Respiración y Levitación constante sin scale */
        .precio-card.premium.animar-visible {
            animation: respirarTarjeta 4s ease-in-out infinite; /* Removido el delay de 1s para que no haya retrasos al aparecer */
        }
        @keyframes respirarTarjeta {
            0%, 100% { transform: translate3d(0, 0, 0); }
            50% { transform: translate3d(0, -10px, 0); }
        }
        
        /* Brillo de la tarjeta premium usando pseudo-elemento (Sin Scale) */
        .precio-card.premium::after {
            content: ''; position: absolute; inset: 0; border-radius: var(--borde-radio);
            box-shadow: 0 0 35px rgba(14, 165, 233, 0.4); opacity: 0; pointer-events: none;
            transition: opacity 0.25s ease, box-shadow 0.25s ease; /* Transición hiper rápida */
        }
        
        .precio-card.premium.animar-visible::after {
            animation: pulsoGlowTarjeta 3s ease-in-out infinite alternate;
        }
        @keyframes pulsoGlowTarjeta {
            0% { opacity: 0.15; }
            100% { opacity: 0.7; }
        }
        
        .precio-card.premium:hover { 
            animation: none !important; /* Anular la animación permite que "transition" actúe instantáneamente sin lag */
            transform: translate3d(0, -15px, 0) !important;
            border-color: var(--color-glow-tech);
        }
        .precio-card.premium:hover::after { 
            animation: none !important; 
            opacity: 1 !important; 
            box-shadow: 0 0 50px rgba(14, 165, 233, 0.6) !important; /* Intensificamos el brillo al tocar */
        }
        
        .etiqueta-popular { position: absolute; top: -15px; left: 50%; transform: translateX(-50%); background: var(--color-acento-masculino); color: #fff; padding: 5px 15px; border-radius: 20px; font-size: 0.85rem; font-weight: 600; white-space: nowrap; }
        
        .etiqueta-estrella { position: absolute; top: -15px; left: 50%; transform: translateX(-50%); background: linear-gradient(90deg, #1E3A8A, #3B82F6, #1E3A8A); color: #FFF; padding: 6px 20px; border-radius: 20px; font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; box-shadow: 0 4px 10px rgba(30, 58, 138, 0.4); white-space: nowrap;}
        
        .precio-header h3 { font-size: 1.5rem; margin-bottom: 10px; }
        .precio-card.premium .precio-header h3 { color: var(--color-glow-tech); }
        
        .precio-monto { font-family: var(--fuente-titulos); font-size: 3rem; color: var(--color-texto-principal); font-weight: 700; margin-bottom: 20px; }
        .precio-card.premium .precio-monto { color: #FFFFFF; }
        .precio-monto span { font-size: 1rem; color: var(--color-texto-secundario); font-weight: 400; font-family: var(--fuente-textos); }
        .precio-card.premium .precio-monto span { color: #A0AEC0; }
        
        .lista-funciones { list-style: none; text-align: left; margin-bottom: 30px; }
        .lista-funciones li { margin-bottom: 12px; font-size: 0.95rem; display: flex; align-items: flex-start; gap: 10px; }
        .lista-funciones li i { color: var(--color-acento-masculino); margin-top: 4px; }
        .precio-card.premium .lista-funciones li i { color: var(--color-glow-tech); }
        .lista-funciones li.no-incluido { color: #A0AEC0; text-decoration: line-through; }
        .lista-funciones li.no-incluido i { color: #A0AEC0; }
        .precio-card.premium .lista-funciones li { color: #f1f5f9; }

        /* ==========================================================================
           9. FOOTER
           ========================================================================== */
        footer { background-color: var(--color-texto-principal); color: #FFFFFF; padding: 60px 0 20px; }
        .footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; margin-bottom: 40px; text-align: center; }
        .footer-col h3 { font-family: var(--fuente-titulos); color: #FFFFFF; font-size: 1.5rem; margin-bottom: 20px; }
        .footer-col h3 span { color: var(--color-acento-secundario); }
        .footer-col p { color: #A0AEC0; font-size: 0.9rem; margin-bottom: 10px; }
        .copyright { text-align: center; border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; color: #A0AEC0; font-size: 0.85rem; }

        /* ==========================================================================
           10. RESPONSIVO
           ========================================================================== */
        @media (min-width: 768px) {
            .pasos-grid { grid-template-columns: repeat(2, 1fr); }
        }
        
        @media (min-width: 992px) {
            .grid-celulares { grid-template-columns: repeat(3, 1fr); gap: 40px; }
            .pasos-grid { grid-template-columns: repeat(4, 1fr); }
            .precios-grid { grid-template-columns: repeat(3, 1fr); }
            
            /* En escritorio el intermedio es ligeramente más grande, sin usar scale (usamos transform origin / padding si fuera necesario, pero lo dejamos al mismo tamaño visual para evitar blur) */
            .celular-intermedio { margin-bottom: 35px; }
            .precio-card.popular { transform: translate3d(0, -15px, 0); }
            .precio-card.popular:hover { transform: translate3d(0, -25px, 0); }
            .precio-card.premium:hover { transform: translate3d(0, -25px, 0) !important; }
        }