/* --- VARIABLES Y ESTILOS GLOBALES --- */
:root {
    --color-bg: #121212;
    --color-bg-light: #1E1E1E;
    --color-primary: #3a7bd5;
    --color-secondary: #00d2ff;
    --color-text: #E0E0E0;
    --color-text-dark: #A0A0A0;
    --color-white: #FFFFFF;
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Roboto', sans-serif;
    --border-radius: 12px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

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

h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--color-white);
}

h1 { font-size: clamp(2.5rem, 5vw, 3.5rem); line-height: 1.2; }
h2 { font-size: clamp(2rem, 4vw, 2.8rem); margin-bottom: 20px; }
p { margin-bottom: 1rem; }
a { color: var(--color-primary); text-decoration: none; }

/* --- BOTONES --- */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    font-family: var(--font-heading);
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-image: linear-gradient(45deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    box-shadow: 0 4px 15px rgba(58, 123, 213, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 210, 255, 0.4);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* --- HEADER --- */
#main-header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 15px 0;
    transition: all 0.3s ease;
}

#main-header.scrolled {
    background-color: rgba(18, 18, 18, 0.8);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

#main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
}
.by-libretitan {
    font-size: 0.8rem;
    color: var(--color-text-dark);
    font-weight: 400;
    display: block;
    line-height: 1;
}

#main-header nav ul {
    list-style: none;
    display: flex;
    gap: 30px;
}

#main-header nav a {
    color: var(--color-text);
    font-weight: 500;
    position: relative;
    padding: 5px 0;
}
#main-header nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-image: linear-gradient(45deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    transition: width 0.3s ease;
}
#main-header nav a:hover::after {
    width: 100%;
}


/* --- SECCIONES --- */
section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}
.section-title p {
    max-width: 600px;
    margin: 10px auto 0;
    color: var(--color-text-dark);
}

/* Hero */
#hero {
    background: linear-gradient(rgba(18,18,18,0.9), rgba(18,18,18,0.9)), url('https://www.transparenttextures.com/patterns/cubes.png');
    padding-top: 150px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}
.hero-container {
    display: flex;
    align-items: center;
    gap: 50px;
}
.hero-content {
    flex: 1;
}
.hero-image {
    flex: 1;
    text-align: center;
}
.hero-image img {
    max-width: 400px;
    width: 100%;
    animation: float 6s ease-in-out infinite;
}

/* Animación flotante */
@keyframes float {
	0% { transform: translateY(0px); }
	50% { transform: translateY(-20px); }
	100% { transform: translateY(0px); }
}

/* Problema/Solución */
.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}
.problem-card {
    background-color: var(--color-bg-light);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid #2a2a2a;
}
.problem-card i {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 20px;
}

/* Módulos */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}
.module-card {
    background: var(--color-bg-light);
    padding: 30px 25px;
    border-radius: var(--border-radius);
    border: 1px solid transparent;
    transition: all 0.3s ease;
    border-left: 3px solid var(--color-primary);
}
.module-card:hover {
    transform: translateY(-5px);
    border-color: #2a2a2a;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.module-card i {
    font-size: 2rem;
    margin-bottom: 15px;
    background: -webkit-linear-gradient(45deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.module-card h3 {
    margin-bottom: 10px;
}

/* Tarifas */
#tarifas { background-color: var(--color-bg-light); }
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    align-items: center;
}
.pricing-card {
    background-color: var(--color-bg);
    padding: 40px;
    border-radius: var(--border-radius);
    border: 1px solid #2a2a2a;
    text-align: center;
    transition: all 0.3s ease;
}
.pricing-card:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}
.pricing-card.popular {
    transform: scale(1.05);
    border: 2px solid var(--color-primary);
    position: relative;
}
.popular-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background-image: linear-gradient(45deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}
.pricing-card h3 { font-size: 1.8rem; }
.pricing-card .description { color: var(--color-text-dark); }
.price {
    font-size: 3rem;
    font-weight: 700;
    margin: 20px 0;
    font-family: var(--font-heading);
}
.price span { font-size: 1rem; color: var(--color-text-dark); }
.pricing-card ul { list-style: none; margin: 30px 0; text-align: left; }
.pricing-card ul li { margin-bottom: 15px; }
.pricing-card ul i { color: var(--color-primary); margin-right: 10px; }
.pricing-note { text-align: center; margin-top: 40px; color: var(--color-text-dark); font-size: 0.9rem; }


/* FAQ */
.faq-container { max-width: 800px; margin: 0 auto; }
.faq-item {
    background-color: var(--color-bg-light);
    margin-bottom: 10px;
    border-radius: var(--border-radius);
    border: 1px solid #2a2a2a;
}
.faq-question {
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-family: var(--font-heading);
    font-size: 1.1rem;
}
.faq-question i { transition: transform 0.3s ease; }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.5s ease;
}
.faq-answer p { padding: 0 20px 20px; margin: 0; }
.faq-item.active .faq-answer { max-height: 200px; }
.faq-item.active .faq-question i { transform: rotate(180deg); }

/* Contacto */
#contacto { background-color: var(--color-bg-light); }
.contact-form { max-width: 600px; margin: 0 auto; }
.form-group { margin-bottom: 20px; }
.contact-form input, .contact-form textarea {
    width: 100%;
    padding: 15px;
    border-radius: var(--border-radius);
    border: 1px solid #333;
    background-color: #2a2a2a;
    color: var(--color-text);
    font-family: var(--font-body);
}
.contact-form input:focus, .contact-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}
.contact-form button { width: 100%; }

/* FOOTER */
footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid #2a2a2a;
}
.footer-links {
    margin-top: 10px;
    color: var(--color-text-dark);
    font-size: 0.9rem;
}
.footer-links a {
    color: var(--color-text-dark);
}
.footer-links a:hover {
    color: var(--color-white);
}

/* --- ANIMACIONES DE SCROLL --- */
.hidden {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.show {
    opacity: 1;
    transform: translateY(0);
}

.fade-in {
    opacity: 0;
    animation: fadeIn 0.8s ease-out forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}
.fade-in[data-delay="100"] { animation-delay: 0.1s; }
.fade-in[data-delay="200"] { animation-delay: 0.2s; }
.fade-in[data-delay="300"] { animation-delay: 0.3s; }


/* --- RESPONSIVIDAD --- */
@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    .hero-image { margin-top: 50px; }
    .hero-image img { max-width: 300px; }
}

@media (max-width: 768px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    #main-header .container {
        flex-direction: column;
        gap: 15px;
    }
    #main-header nav ul {
        gap: 20px;
    }
    #main-header .btn { display: none; } /* Ocultar botón demo en móvil */
}
/* --- NUEVA ANIMACIÓN LLAMATIVA DE VOLTEO (FLIP) --- */

/* Contenedor de la palabra que se anima. Es vital para que transform funcione. */
.word-swapper {
    display: inline-block; /* Permite aplicar transformaciones */
    transition: transform 0.6s cubic-bezier(0.2, 1, 0.3, 1), opacity 0.5s;
    transform-style: preserve-3d; /* Activa el contexto 3D */
    transform-origin: center 60%; /* Ajusta el eje de rotación para que se vea natural */
}

/* Estado cuando la palabra está "oculta" o "volteada" */
.word-is-swapping {
    transform: rotateX(180deg) translateY(15px); /* La voltea y la mueve un poco */
    opacity: 0;
}

/* Para un efecto extra, podemos cambiar el color durante la transición */
.word-swapper[data-content="Telegram"] {
    color: #0088cc; /* Color azul de Telegram */
    font-weight: 600; /* Le damos un poco más de énfasis */
}

.word-swapper[data-content="WhatsApp"] {
    color: #25D366; /* Color verde de WhatsApp */
    font-weight: 600;
}