/* ==========================================================================
   1. Variables Globales (:root)
   ========================================================================== */
:root {
    /* Paleta de colores principal (basada en index.html y about.html) */
    --primary: #4f46e5;        /* Morado moderno y accesible */
    --primary-dark: #3730a3;
    --primary-light: #818cf8;
    --secondary: #10b981;      /* Verde esmeralda para acentos y éxito */
    --secondary-dark: #059669;
    --accent: #f59e0b;          /* Naranja/ámbar para llamadas a la acción */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1e293b;            /* Azul oscuro casi negro para texto principal */
    --dark-blue: #0f172a;       /* Para fondos oscuros o elementos contrastantes */
    --light: #f8fafc;           /* Un blanco ligeramente cálido para fondos de página */
    --gray: #64748b;            /* Gris azulado para texto secundario */
    --gray-light: #e2e8f0;      /* Para bordes o fondos muy sutiles */
    --paper: #fdf6e3;           /* Color papel más cálido y amigable (usado en index) */
    --cream: #fffbeb;           /* Crema para secciones destacadas */

    /* Tipografía (consistente) */
    --font-heading: 'Space Grotesk', 'Merriweather', serif; /* Prioriza Space Grotesk si te gusta el look moderno, fallback a Merriweather */
    --font-body: 'Outfit', 'Montserrat', sans-serif;    /* Prioriza Outfit, fallback a Montserrat */
    --font-code: 'Fira Code', monospace;

    /* Espaciado (consistente) */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Bordes y sombras (consistente) */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 1px 1px rgba(0,0,0,0.02);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 10px 10px -5px rgba(0,0,0,0.03);
    --shadow-book: 0 15px 25px -12px rgba(0,0,0,0.3), 5px 5px 10px 0 rgba(0,0,0,0.1);

    /* Transiciones (consistente) */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   2. Resets y Estilos Base
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--dark);
    background-color: var(--paper); /* Fondo general tipo papel */
    line-height: 1.7;
    overflow-x: hidden;
    /* Fondo con patrón sutil, puedes elegir uno o quitarlo si prefieres un color sólido */
    background-image: 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='%23e0e0e0' fill-opacity='0.1' fill-rule='evenodd'/%3E%3C/svg%3E");
    background-attachment: fixed;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    color: var(--dark-blue); /* Usar un azul oscuro para mejor contraste en fondo claro */
    margin-bottom: var(--spacing-md); /* Ajustar margen base */
}

h1 { font-size: clamp(2.5rem, 5vw, 3.5rem); }
h2 { 
    font-size: clamp(2rem, 4vw, 2.8rem); 
    margin-top: var(--spacing-2xl);
    padding-bottom: var(--spacing-sm);
    position: relative;
}
/* Línea decorativa para H2 (opcional, pero consistente) */
h2::after {
    content: '';
    position: absolute;
    bottom: -5px; /* Ajustar posición */
    left: 0;
    width: 70px;
    height: 4px;
    background-color: var(--primary);
    border-radius: var(--radius-sm);
}
h3 { font-size: clamp(1.5rem, 3vw, 2.2rem); margin-top: var(--spacing-xl); color: var(--primary-dark); }
p  { font-size: clamp(1rem, 2.5vw, 1.125rem); margin-bottom: var(--spacing-lg); }
a  { text-decoration: none; color: var(--primary); transition: color var(--transition-normal); }
a:hover { color: var(--primary-dark); text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
button { cursor: pointer; font-family: var(--font-body); border: none; background: none; }

/* ==========================================================================
   3. Layout General y Contenedores
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px; /* Consistente */
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-3xl) 0;
}

/* ==========================================================================
   4. Header y Navegación
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000; /* Asegurar que esté por encima de otros elementos */
    background-color: rgba(253, 246, 227, 0.9); /* Fondo --paper con opacidad */
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal);
}
.header.scrolled {
    box-shadow: var(--shadow-md);
}
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px; /* Altura consistente */
}
.logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}
.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: var(--primary);
    color: white;
    border-radius: var(--radius-md);
    font-weight: 700;
}
.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}
.nav-link {
    font-weight: 500;
    color: var(--dark);
    position: relative;
    padding: var(--spacing-sm) 0;
}
.nav-link:hover {
    color: var(--primary);
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: width var(--transition-normal);
}
.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}
.nav-link.active {
    color: var(--primary);
}
.mobile-menu-btn {
    display: none;
    font-size: 1.8rem;
    color: var(--dark);
    background: transparent;
    border: none;
    padding: var(--spacing-sm);
    cursor: pointer;
}

/* ==========================================================================
   5. Botones
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem; /* Padding base */
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
    gap: var(--spacing-sm);
    text-align: center;
    text-decoration: none; /* Asegurar que no haya subrayado si es un <a> */
}
.btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.btn-secondary {
    background-color: var(--secondary);
    color: white;
    box-shadow: var(--shadow-sm);
}
.btn-secondary:hover {
    background-color: var(--secondary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.btn-outline {
    border: 2px solid var(--primary);
    color: var(--primary);
    background-color: transparent;
}
.btn-outline:hover {
    background-color: var(--primary);
    color: white;
}

/* ==========================================================================
   6. Footer
   ========================================================================== */
.footer {
    background-color: var(--dark-blue); /* Usar el azul más oscuro */
    color: white;
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-3xl); /* Espacio antes del footer */
}
.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    align-items: start; /* Alinear items al inicio */
}
.footer-column .footer-logo { /* Estilo específico para el logo en el footer */
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    display: inline-block;
    color: white; /* Asegurar color blanco */
}
.footer-description {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
}
.footer-social {
    display: flex;
    gap: var(--spacing-md);
}
.footer-social-link {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white; /* Asegurar que el icono sea blanco */
    font-size: 1.2rem; /* Tamaño del icono */
    transition: var(--transition-normal);
}
.footer-social-link:hover {
    background-color: var(--primary);
    transform: translateY(-3px);
}
.footer-heading {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: white;
    font-weight: 600;
}
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-link-item {
    margin-bottom: var(--spacing-sm);
}
.footer-link {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-normal);
    font-size: 0.9rem;
}
.footer-link a:hover { /* Aplicar hover al <a> dentro del <li> */
    color: white;
    padding-left: var(--spacing-sm);
}
.footer-bottom {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    flex-wrap: wrap; /* Para responsividad */
}
.footer-bottom-links {
    display: flex;
    gap: var(--spacing-lg);
}
.footer-bottom-link {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-normal);
}
.footer-bottom-link:hover {
    color: white;
}


/* ==========================================================================
   7. Estilos de Contenido de Capítulos (Común)
   ========================================================================== */
.chapter-header { /* Para los encabezados de las páginas de capítulo */
    padding-top: 120px;
    padding-bottom: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    position: relative;
    overflow: hidden;
    text-align: center; /* Centrar contenido del header */
}
.chapter-header::before { /* Patrón sutil para el header */
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.3; /* Ajustar opacidad del patrón */
}
.chapter-header-content {
    position: relative;
    z-index: 1;
}
.chapter-number {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}
.chapter-title {
    font-size: clamp(2.5rem, 6vw, 3.5rem); /* Título responsive */
    margin-bottom: var(--spacing-lg);
    color: white;
}
.chapter-meta {
    display: flex;
    flex-wrap: wrap; /* Para que se ajusten en móvil */
    justify-content: center; /* Centrar items */
    gap: var(--spacing-md) var(--spacing-lg); /* Espacio vertical y horizontal */
    font-size: 1rem; /* Ligeramente más pequeño */
    opacity: 0.9;
}
.chapter-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.chapter-content { /* Contenedor principal del contenido del capítulo */
    padding: var(--spacing-2xl) 0 var(--spacing-3xl);
}
.chapter-layout { /* Layout con sidebar (TOC) */
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: var(--spacing-2xl);
}
.content-wrapper { /* Contenedor del texto principal del capítulo */
    max-width: 800px;
    margin: 0 auto; /* Centrar si no hay sidebar o en móvil */
}
.chapter-layout .content-wrapper {
    margin: 0; /* Quitar margen auto cuando hay sidebar */
}

/* Tabla de Contenidos (TOC) */
.toc {
    position: sticky;
    top: 90px; /* Ajustar según altura del header + progress bar */
    max-height: calc(100vh - 120px); /* Dejar espacio para header y algo de margen */
    overflow-y: auto;
    padding-right: var(--spacing-md);
    font-size: 0.9rem;
}
.toc-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary);
    color: var(--primary-dark);
}
.toc-list {
    list-style: none;
    margin-left: 0;
    padding-left: 0;
}
.toc-item {
    margin-bottom: var(--spacing-sm);
}
.toc-link {
    display: block;
    padding: var(--spacing-xs) 0;
    color: var(--gray);
    border-left: 3px solid transparent;
    padding-left: var(--spacing-md);
    text-decoration: none;
    transition: all var(--transition-fast);
}
.toc-link:hover {
    color: var(--primary);
    padding-left: calc(var(--spacing-md) + 3px);
}
.toc-link.active {
    color: var(--primary);
    font-weight: 600;
    border-left-color: var(--primary);
    padding-left: calc(var(--spacing-md) + 3px);
}
.toc-sublist {
    list-style: none;
    margin-left: var(--spacing-lg);
    padding-left: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    border-left: 1px dashed var(--gray-light);
}

/* Bloques de Código */
.code-block {
    position: relative;
    margin: var(--spacing-xl) 0; /* Aumentar margen */
}
.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--dark);
    color: rgba(255,255,255,0.8); /* Color de texto más suave */
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    font-family: var(--font-code);
    font-size: 0.85rem; /* Ligeramente más pequeño */
}
.code-block-title {
    font-weight: 500; /* Menos peso */
}
.code-block-actions {
    display: flex;
    gap: var(--spacing-sm);
}
.code-block-action { /* Botón de copiar */
    background-color: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: rgba(255,255,255,0.7);
    cursor: pointer;
    transition: var(--transition-normal);
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}
.code-block-action:hover {
    background-color: rgba(255,255,255,0.2);
    color: white;
}
pre {
    background-color: var(--dark-blue);
    color: #f8f8f2; /* Color de texto común para temas oscuros */
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
    font-family: var(--font-code);
    font-size: 0.9rem; /* Consistente */
    line-height: 1.6; /* Mejorar legibilidad */
}
.code-block pre { /* Si el pre está dentro de code-block */
    margin: 0;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}
code { /* Para código inline */
    font-family: var(--font-code);
    background-color: var(--gray-light);
    color: var(--primary-dark); /* Para que resalte */
    padding: 0.2em 0.4em; /* sutil padding */
    border-radius: var(--radius-sm);
    font-size: 0.9em; /* Ligeramente más pequeño que el texto normal */
}
pre code { /* Para código dentro de <pre> */
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    font-size: 1em; /* Hereda de pre */
    color: inherit; /* Hereda de pre */
}

/* Cajas destacadas */
.highlight-box, .note-box, .warning-box, .celebration-box, .history-box, .movie-box {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md); /* Redondeo generalizado */
    margin: var(--spacing-xl) 0;
    border-left-width: 5px; /* Borde izquierdo más grueso */
    border-left-style: solid;
}
.highlight-box {
    background-color: rgba(var(--primary-rgb, 79,70,229), 0.05); /* Usar RGB para opacidad */
    border-left-color: var(--primary);
    color: var(--dark);
}
.note-box {
    background-color: rgba(var(--secondary-rgb, 236,72,153), 0.05);
    border-left-color: var(--secondary);
    color: var(--dark);
}
.warning-box {
    background-color: rgba(var(--warning-rgb, 245,158,11), 0.08);
    border-left-color: var(--warning);
    color: #855000; /* Texto oscuro para warning */
}
.warning-box strong { color: #c27803; }

.celebration-box {
    background-color: rgba(var(--success-rgb, 16,185,129), 0.05);
    border-left-color: var(--success);
    color: var(--dark);
}
.history-box, .movie-box {
    background-color: rgba(var(--accent-rgb, 6,182,212), 0.05);
    border-left-color: var(--accent);
    color: var(--dark);
}
.history-box { display: flex; gap: var(--spacing-lg); align-items: center; }
.history-image { width: 100px; flex-shrink: 0; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
.history-content { flex: 1; }
.history-title, .movie-title { font-size: 1.2rem; font-weight: 600; margin-bottom: var(--spacing-sm); color: var(--accent); }


/* Estilos para Tablas */
.table-container {
    overflow-x: auto;
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}
table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
}
th, td {
    padding: var(--spacing-md);
    text-align: left;
    border: 1px solid var(--gray-light);
}
th {
    background-color: var(--primary-light); /* Fondo más suave para th */
    color: var(--primary-dark);
    font-weight: 600;
}
tr:nth-child(even) {
    background-color: #f9f9f9; /* Alternar color más sutil */
}
tr:hover {
    background-color: rgba(var(--primary-rgb, 79,70,229), 0.05);
}

/* Navegación entre capítulos */
.chapter-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-light);
}
.nav-btn { /* Reutiliza .btn pero se puede especializar */
    text-decoration: none;
}
.nav-btn.prev { /* Estilo para el botón "anterior" */
    /* Puedes añadir estilos específicos si lo necesitas */
}
.nav-btn.next { /* Estilo para el botón "siguiente" */
    background-color: var(--primary); /* Ya definido en .btn-primary */
    color: white;
}
.nav-btn.next:hover {
    background-color: var(--primary-dark);
}

/* Barra de progreso de lectura */
.progress-container {
    position: fixed;
    top: 70px; /* Debajo del header */
    left: 0;
    width: 100%;
    height: 5px;
    background-color: transparent; /* Hacerla sutil o quitar si no te gusta */
    z-index: 999; /* Justo debajo del header */
}
.progress-bar {
    height: 100%;
    background-color: var(--secondary); /* Color de acento */
    width: 0%;
    transition: width 0.1s ease-out; /* Transición suave */
}

/* Página "Acerca de" (about.html) - Estilos específicos */
.page-header { /* Generalizado para cualquier página con un header similar */
    padding-top: 120px;
    padding-bottom: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    position: relative;
    overflow: hidden;
    text-align: center;
}
.page-header::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.6;
}
.page-header-content { position: relative; z-index: 1; max-width: 900px; margin: 0 auto; padding: 0 var(--spacing-lg); }
.page-title { font-size: clamp(2.8rem, 6vw, 4rem); margin-bottom: var(--spacing-md); color: white; text-shadow: 1px 1px 3px rgba(0,0,0,0.2); }
.page-description { font-size: clamp(1.1rem, 2.8vw, 1.3rem); max-width: 700px; margin: 0 auto var(--spacing-xl); opacity: 0.9; line-height: 1.8; }

.about-section { margin-bottom: var(--spacing-3xl); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-2xl); align-items: center; margin-bottom: var(--spacing-3xl); }
.about-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.about-content { padding: var(--spacing-lg); }
.about-title { /* Ya cubierto por h2 global */ }
.about-text { font-size: 1.1rem; margin-bottom: var(--spacing-lg); } /* Ajuste tamaño fuente */
.about-list { list-style: none; margin-bottom: var(--spacing-xl); padding-left: 0; }
.about-list-item { display: flex; align-items: flex-start; gap: var(--spacing-sm); margin-bottom: var(--spacing-md); }
.about-list-icon { color: var(--success); font-size: 1.25rem; flex-shrink: 0; margin-top: 2px; }

/* Sección Misión (reusada en About) */
.mission-section { background-color: var(--dark-blue); color: white; padding: var(--spacing-3xl) 0; margin: var(--spacing-3xl) 0; }
.mission-container { max-width: 1000px; margin: 0 auto; text-align: center; }
.mission-title { color: white; /* Ya cubierto por h2 global, pero especificidad por si acaso */ }
.mission-text { font-size: 1.25rem; margin-bottom: var(--spacing-xl); opacity: 0.9; }
.mission-values { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: var(--spacing-xl); margin-top: var(--spacing-2xl); }
.mission-value { background-color: rgba(255, 255, 255, 0.05); border-radius: var(--radius-lg); padding: var(--spacing-xl); transition: var(--transition-normal); border: 1px solid rgba(255, 255, 255, 0.1); }
.mission-value:hover { transform: translateY(-5px); background-color: rgba(255, 255, 255, 0.1); }
.mission-value-icon { font-size: 2.5rem; margin-bottom: var(--spacing-md); } /* Asumimos que son emojis o iconos de fuente */
.mission-value-title { font-size: 1.25rem; margin-bottom: var(--spacing-md); color: white; }
.mission-value-text { color: rgba(255, 255, 255, 0.7); font-size: 0.95rem; }

/* Estilos de Tarjetas (reusables para episodios, cursos, etc.) */
.book-card, .course-card, .social-card {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    display: flex;
    flex-direction: column;
    height: 100%; /* Para que las tarjetas en una fila tengan la misma altura */
    text-decoration: none; /* Si son enlaces */
}
.book-card:hover, .course-card:hover, .social-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl); /* Sombra más pronunciada al hacer hover */
}
.book-card-image-placeholder, .course-image, .social-card-image {
    height: 200px; /* Altura fija para la imagen/placeholder */
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem; /* Para placeholders de texto como E1, E2 */
    color: white;
    font-family: var(--font-heading);
}
.book-card-image-placeholder { /* Placeholder específico */
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent) 100%);
}
.course-image, .social-card-image { /* Para imágenes reales */
    width: 100%;
    object-fit: cover; /* Asegura que la imagen cubra el área sin distorsionarse */
}

.book-card-content, .course-content, .social-card-content {
    padding: var(--spacing-lg);
    flex-grow: 1; /* Para que el contenido ocupe el espacio y el footer quede abajo */
    display: flex;
    flex-direction: column;
}
.book-card-title, .course-title, .social-card-title {
    font-size: 1.5rem; /* Consistente */
    margin-bottom: var(--spacing-sm);
    color: var(--dark-blue);
    font-weight: 700;
}
.book-card-subtitle, .course-description, .social-card-text {
    font-size: 0.95rem;
    color: var(--gray);
    margin-bottom: var(--spacing-lg);
    flex-grow: 1; /* Para empujar el meta/footer hacia abajo */
}

/* Meta de las tarjetas (nivel, estado, etc.) */
.book-card-meta, .course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--gray);
    margin-top: auto; /* Empujar al final */
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-light);
}
.book-card-level, .book-card-status, .course-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    color: white;
}
.level-beginner { background-color: var(--success); }
.level-intermediate { background-color: var(--warning); }
.level-advanced { background-color: var(--danger); }
.status-available { background-color: var(--secondary); }
.status-coming-soon { background-color: var(--accent); color: var(--dark-blue); }
.course-badge { /* Usado en la imagen del curso */
    position: absolute; top: var(--spacing-md); right: var(--spacing-md);
}
.book-card-chapters-count, .course-meta {
    font-weight: 500;
}
.course-meta span { display: inline-flex; align-items: center; gap: var(--spacing-xs); } /* Para iconos en meta */
.course-link, .social-card-link {
    color: var(--primary);
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    margin-top: auto; /* Para social-card-link */
}
.course-link:hover, .social-card-link:hover {
    background-color: var(--primary-light);
    color: var(--primary-dark);
    text-decoration: none;
}

/* Estilos para la página de índice (indice.html) */
.search-box { margin-bottom: var(--spacing-2xl); position: relative; }
.search-input {
    width: 100%; padding: var(--spacing-md) var(--spacing-lg);
    padding-left: 3.5rem; border: 1px solid var(--gray-light);
    border-radius: var(--radius-lg); font-size: 1.1rem;
    transition: var(--transition-normal); box-shadow: var(--shadow-sm);
}
.search-input:focus {
    outline: none; border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229, 0.25); /* Usar RGB de --primary */
}
.search-icon {
    position: absolute; left: var(--spacing-lg); top: 50%;
    transform: translateY(-50%); color: var(--gray); font-size: 1.5rem;
}

.index-section { margin-bottom: var(--spacing-3xl); }
.index-section-title { /* Ya cubierto por h2 */ }
.index-section-title .episode-icon {
    margin-right: var(--spacing-md);
    font-size: 1.5em; /* Relativo al h2 */
    color: var(--primary);
}
.index-list { list-style: none; padding-left: 0; }
.index-item {
    background-color: white; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md); margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    border-left: 5px solid var(--primary-light);
}
.index-item:hover {
    transform: translateY(-5px) scale(1.01);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--primary);
}
.index-item-header { display: flex; align-items: flex-start; gap: var(--spacing-md); margin-bottom: var(--spacing-sm); flex-wrap: wrap;}
.index-item-prefix {
    font-weight: 600; font-size: 0.8rem;
    background-color: var(--primary-light); color: var(--primary-dark);
    padding: var(--spacing-xs) var(--spacing-sm); border-radius: var(--radius-sm);
    flex-shrink: 0;
}
.index-item-title {
    font-size: clamp(1.2rem, 2.8vw, 1.5rem); font-weight: 600;
    color: var(--dark-blue); margin-bottom: var(--spacing-xs); line-height: 1.4;
    flex-grow: 1; /* Para que ocupe espacio y el status quede a la derecha */
}
.index-item-title a { color: inherit; text-decoration: none; }
.index-item-title a:hover { color: var(--primary); }
.index-item-status { font-size: 0.8rem; font-weight: 600; padding: var(--spacing-xs) var(--spacing-sm); border-radius: var(--radius-full); margin-left: auto; align-self: flex-start; }
.index-item-description { font-size: 0.95rem; color: var(--gray); margin-bottom: var(--spacing-md); }
.index-item-meta { display: flex; flex-wrap: wrap; gap: var(--spacing-sm) var(--spacing-md); font-size: 0.8rem; color: var(--gray); align-items: center; }
.index-item-meta-item { display: flex; align-items: center; gap: var(--spacing-xs); background-color: var(--gray-light); padding: var(--spacing-xs) var(--spacing-sm); border-radius: var(--radius-full); }
.index-item-meta-item svg { width: 1em; height: 1em; margin-right: 0.3em; }
.index-item-link-container { margin-top: var(--spacing-md); text-align: right; }
.index-item-link { /* Usa .btn .btn-outline o similar */
    display: inline-flex; align-items: center; gap: var(--spacing-xs);
    font-weight: 600; font-size: 0.9rem; color: var(--primary-dark);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--primary-light); border-radius: var(--radius-full);
}
.index-item-link:hover { background-color: var(--primary-dark); color: white; border-color: var(--primary-dark); text-decoration: none;}

/* ==========================================================================
   8. Estilos para Componentes Interactivos Específicos
      (Considera mover a otro CSS si se vuelven muy extensos y solo se usan en páginas específicas)
   ========================================================================== */

/* Estilos de componentes-interactivos.html */
.computer-container { position: relative; width: 100%; height: 600px; background-color: #f8f9fa; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); overflow: hidden; }
.computer-case { position: absolute; width: 80%; height: 90%; top: 5%; left: 10%; background-color: #2d3748; border-radius: 10px; box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5); overflow: hidden; }
.computer-case::before, .computer-case::after { content: ''; position: absolute; left: 10px; right: 10px; height: 30px; background-color: #1a202c; border-radius: 5px; }
.computer-case::before { top: 10px; }
.computer-case::after { bottom: 10px; }
.component { position: absolute; cursor: pointer; transition: transform 0.3s ease, filter 0.3s ease; }
.component:hover { transform: translateY(-5px); filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.6)); }
.component.active { filter: drop-shadow(0 0 12px rgba(236, 72, 153, 0.8)); }
.motherboard { width: 60%; height: 70%; top: 15%; left: 20%; }
.cpu { width: 10%; height: 10%; top: 30%; left: 45%; z-index: 2; }
.ram { width: 30%; height: 8%; top: 20%; left: 30%; z-index: 2; }
.hdd { width: 15%; height: 12%; top: 50%; left: 35%; z-index: 2; }
.psu { width: 20%; height: 15%; top: 70%; left: 25%; z-index: 2; }
.info-panel { position: absolute; top: 0; right: 0; width: 30%; height: 100%; background-color: white; box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1); padding: var(--spacing-lg); transform: translateX(100%); transition: transform 0.3s ease; z-index: 10; overflow-y: auto; }
.info-panel.active { transform: translateX(0); }
.info-title { font-family: var(--font-heading); font-size: 1.5rem; margin-bottom: var(--spacing-md); color: var(--primary-dark); border-bottom: 2px solid var(--primary-light); padding-bottom: var(--spacing-sm); }
.info-description { margin-bottom: var(--spacing-lg); }
.info-specs { background-color: #f1f5f9; padding: var(--spacing-md); border-radius: var(--radius-md); margin-bottom: var(--spacing-lg); }
.info-specs h3 { font-size: 1rem; margin-bottom: var(--spacing-sm); color: var(--gray); }
.spec-item { display: flex; justify-content: space-between; margin-bottom: var(--spacing-xs); }
.spec-label { font-weight: 600; }
.info-image { width: 100%; border-radius: var(--radius-md); margin-bottom: var(--spacing-lg); }
.close-btn { position: absolute; top: 10px; right: 10px; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--gray); }
.close-btn:hover { color: var(--danger); }
.component-label { position: absolute; background-color: rgba(255, 255, 255, 0.9); padding: 2px 8px; border-radius: 12px; font-size: 0.8rem; font-weight: 600; color: var(--primary-dark); box-shadow: var(--shadow-sm); pointer-events: none; opacity: 0; transition: opacity 0.3s ease; }
.component:hover + .component-label { opacity: 1; }
.legend { display: flex; justify-content: center; flex-wrap: wrap; gap: var(--spacing-md); margin-top: var(--spacing-lg); }
.legend-item { display: flex; align-items: center; gap: var(--spacing-xs); padding: var(--spacing-xs) var(--spacing-sm); background-color: white; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); cursor: pointer; transition: transform 0.2s ease; }
.legend-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.legend-color { width: 12px; height: 12px; border-radius: 50%; }
.legend-text { font-size: 0.9rem; font-weight: 500; }
.motherboard-color { background-color: #10b981; } .cpu-color { background-color: #ec4899; } .ram-color { background-color: #6366f1; } .hdd-color { background-color: #06b6d4; } .psu-color { background-color: #f59e0b; }
.instructions { text-align: center; margin: var(--spacing-lg) 0; font-style: italic; color: var(--gray); }

/* Estilos para el simulador de terminal y Python (capitulo-1 y otros) */
.terminal-container, .python-terminal-container { background-color: var(--dark-blue); border-radius: var(--radius-md); padding: var(--spacing-lg); margin: var(--spacing-xl) 0; font-family: var(--font-code); color: white; }
.terminal-header, .python-terminal-header { display: flex; align-items: center; margin-bottom: var(--spacing-md); }
.terminal-title, .python-terminal-title { font-size: 1rem; margin-left: var(--spacing-md); color: rgba(255, 255, 255, 0.7); }
.terminal-dots { display: flex; gap: 6px; }
.terminal-dot { width: 12px; height: 12px; border-radius: 50%; }
.terminal-dot-red { background-color: #ff5f56; } .terminal-dot-yellow { background-color: #ffbd2e; } .terminal-dot-green { background-color: #27c93f; }
.terminal-body, .python-terminal-body { height: 300px; /* Ajustar según necesidad */ overflow-y: auto; padding: var(--spacing-md); background-color: rgba(0,0,0,0.3); border-radius: var(--radius-sm); line-height: 1.5; }
.terminal-output, .python-terminal-output { margin-bottom: var(--spacing-sm); white-space: pre-wrap; }
.terminal-prompt, .python-terminal-prompt { display: flex; align-items: center; margin-bottom: var(--spacing-sm); }
.terminal-prompt-symbol, .python-terminal-prompt-symbol { color: var(--success); margin-right: var(--spacing-sm); font-weight: bold; }
.terminal-input, .python-terminal-input { background: none; border: none; color: white; font-family: var(--font-code); font-size: 0.9rem; width: 100%; outline: none; }
.python-prompt { color: var(--primary-light); margin-right: var(--spacing-sm); } /* Específico para prompt de Python >>> */

/* ==========================================================================
   9. Clases de Utilidad
   ========================================================================== */
.text-center { text-align: center; }
.mt-1 { margin-top: var(--spacing-sm); } .mt-2 { margin-top: var(--spacing-md); } .mt-3 { margin-top: var(--spacing-lg); } .mt-4 { margin-top: var(--spacing-xl); } .mt-5 { margin-top: var(--spacing-2xl); }
.mb-1 { margin-bottom: var(--spacing-sm); } .mb-2 { margin-bottom: var(--spacing-md); } .mb-3 { margin-bottom: var(--spacing-lg); } .mb-4 { margin-bottom: var(--spacing-xl); } .mb-5 { margin-bottom: var(--spacing-2xl); }
.animate-fade-in { animation: fadeIn 0.5s ease-out forwards; }
.delay-100 { animation-delay: 100ms; } .delay-200 { animation-delay: 200ms; } .delay-300 { animation-delay: 300ms; } .delay-400 { animation-delay: 400ms; } .delay-500 { animation-delay: 500ms; }

/* ==========================================================================
   10. Animaciones
   ========================================================================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   11. Estilos Responsivos
   ========================================================================== */
@media (max-width: 992px) { /* Tablets y pantallas medianas */
    .chapter-layout { grid-template-columns: 1fr; }
    .toc { display: none; } /* Ocultar TOC o convertir en menú desplegable */
    .about-grid { grid-template-columns: 1fr; }
    .about-image { order: -1; margin-bottom: var(--spacing-lg); }
    .page-title { font-size: 2.8rem; }
    .chapter-title { font-size: 2.5rem; }
    .mission-title, .contact-title { font-size: 2.2rem; }
    .mission-text, .page-description { font-size: 1.1rem; }
}

@media (max-width: 768px) { /* Móviles grandes y tablets pequeñas */
    .header-container { height: 60px; }
    .progress-container { top: 60px; } /* Ajustar si el header es más pequeño */
    .nav {
        position: fixed; top: 60px; left: 0; width: 100%; height: 0;
        background-color: var(--paper); /* Fondo del menú móvil */
        flex-direction: column; align-items: flex-start;
        padding: 0 var(--spacing-lg); overflow: hidden;
        transition: height var(--transition-normal), opacity var(--transition-normal), visibility var(--transition-normal);
        box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; z-index: 999;
    }
    .nav.active { height: auto; min-height: calc(100vh - 60px); padding: var(--spacing-lg); opacity: 1; visibility: visible; }
    .nav-link { width: 100%; padding: var(--spacing-md) 0; border-bottom: 1px solid var(--gray-light); }
    .nav-link:last-child { border-bottom: none; }
    .nav .btn { width: 100%; margin-top: var(--spacing-md); }
    .mobile-menu-btn { display: block; }

    .hero-container { flex-direction: column-reverse; text-align: center; gap: var(--spacing-xl); }
    .hero-title::after { left: 50%; transform: translateX(-50%); }
    .hero-buttons { justify-content: center; flex-direction: column; width: 100%; max-width: 300px; margin: var(--spacing-xl) auto 0; }
    .hero-buttons .btn { width: 100%; }
    
    .page-title { font-size: 2.2rem; }
    .chapter-title { font-size: 2rem; }
    .page-description { font-size: 1rem; }
    .section-title { font-size: 1.8rem; }
    .about-title, .contact-title, .mission-title { font-size: 1.8rem; }
    .about-text, .mission-text, .social-description, .contact-description { font-size: 1rem; }
    
    .footer-container { grid-template-columns: 1fr; text-align: center; }
    .footer-column { margin-bottom: var(--spacing-lg); }
    .footer-social { justify-content: center; }
    .footer-bottom { flex-direction: column; gap: var(--spacing-md); text-align: center; }
    .footer-bottom-links { justify-content: center; flex-wrap: wrap; }
    
    .episodes-container, .courses-grid, .social-grid, .contact-methods, .mission-values { grid-template-columns: 1fr; }
    .chapter-meta { flex-direction: column; align-items: center; gap: var(--spacing-sm); }
    .chapter-navigation { flex-direction: column; gap: var(--spacing-md); }
    .nav-btn { width: 100%; justify-content: center; }
}

@media (max-width: 576px) { /* Móviles pequeños */
    .page-title { font-size: 1.8rem; }
    .chapter-title { font-size: 1.8rem; }
    .hero-title { font-size: 1.8rem; }
    .section-title, .about-title, .contact-title, .mission-title { font-size: 1.6rem; } /* Unificar títulos de sección */
    .book-card, .course-card { width: 100%; height: auto; }
    .book-card-title, .course-title { font-size: 1.2rem; } /* Títulos de tarjeta más pequeños */
    .about-content { padding: var(--spacing-md) 0; }
    .footer-bottom-links { flex-direction: column; gap: var(--spacing-sm); }
    .code-block-header { flex-direction: column; align-items: flex-start; gap: var(--spacing-xs);}
    .code-block-actions { margin-top: var(--spacing-xs); }
}

/* Estilos específicos para la página en-construccion.html */
.construction-main-content { /* Renombrar para evitar colisión con .main-content general */
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    padding-top: 70px; /* Para el header fijo */
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    position: relative; overflow: hidden;
}
.construction-main-content::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}
.construction-container {
    position: relative; z-index: 1; max-width: 800px;
    margin: 0 auto; padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center; color: white;
}
.construction-icon { font-size: 5rem; margin-bottom: var(--spacing-xl); animation: bounce 2s infinite; }
@keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }
.construction-title { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: var(--spacing-lg); color: white; } /* Hereda color de .construction-container */
.construction-text { font-size: 1.25rem; margin-bottom: var(--spacing-2xl); opacity: 0.9; max-width: 600px; margin-left: auto; margin-right: auto; }
.btn-light { background-color: white; color: var(--primary); } /* Botón específico para esta página */
.btn-light:hover { background-color: rgba(255, 255, 255, 0.9); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.construction-buttons { display: flex; gap: var(--spacing-md); justify-content: center; margin-top: var(--spacing-xl); flex-wrap: wrap; }
.construction-buttons .btn { width: 100%; max-width: 300px; } /* Para que los botones se apilen en móvil */

/* Estilos para el modal de index.html (lista de capítulos) */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.6); /* Fondo oscuro semitransparente */
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex; justify-content: center; align-items: center;
    opacity: 0; visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal {
    width: 90%; max-width: 800px; max-height: 90vh;
    background-color: var(--light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden; /* Para que el contenido no se desborde del radio */
    display: flex; flex-direction: column; /* Para organizar header, body, footer */
    transform: scale(0.95) translateY(10px);
    opacity: 0;
    transition: transform var(--transition-normal) 0.1s, opacity var(--transition-normal) 0.1s; /* Pequeño delay en la transición */
}
.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
    opacity: 1;
}
.modal-header {
    padding: var(--spacing-lg);
    background: var(--primary); color: white;
    display: flex; justify-content: space-between; align-items: center;
    border-bottom: 1px solid var(--primary-dark);
}
.modal-title { font-size: 1.5rem; margin-bottom: 0; color: white; }
.modal-subtitle { font-size: 1rem; opacity: 0.9; color:white; margin-top: var(--spacing-xs);}
.modal-close {
    background: transparent; border: none; color: white;
    font-size: 2rem; line-height: 1; cursor: pointer;
    transition: transform var(--transition-fast), color var(--transition-fast);
    padding: var(--spacing-xs);
}
.modal-close:hover { transform: rotate(90deg); color: var(--primary-light); }
.modal-body {
    padding: var(--spacing-lg);
    max-height: calc(90vh - 140px); /* Ajustar según altura del header y footer del modal */
    overflow-y: auto;
}
.chapters-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); /* Columnas responsivas */
    gap: var(--spacing-lg);
}
.chapter-item {
    background-color: white; border-radius: var(--radius-md);
    padding: var(--spacing-lg); box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border-left: 4px solid var(--primary-light);
    display: flex; flex-direction: column; /* Para alinear el footer */
}
.chapter-item:hover {
    transform: translateY(-5px); box-shadow: var(--shadow-lg);
    border-left-color: var(--primary);
}
.chapter-item-title { font-size: 1.2rem; margin-bottom: var(--spacing-sm); color: var(--dark-blue); }
.chapter-item-description { color: var(--gray); margin-bottom: var(--spacing-md); font-size: 0.875rem; flex-grow: 1; }
.chapter-item-footer { display: flex; justify-content: space-between; align-items: center; margin-top: auto; padding-top: var(--spacing-sm); border-top: 1px solid var(--gray-light); }
.chapter-item-meta { display: flex; align-items: center; gap: var(--spacing-sm); color: var(--gray); font-size: 0.75rem; }
.chapter-item-link {
    color: var(--primary); font-weight: 600; font-size: 0.875rem;
    display: inline-flex; align-items: center; gap: 4px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius:var(--radius-sm);
    text-decoration: none;
}
.chapter-item-link:hover {
    background-color: var(--primary-light);
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Estilos para el hero section de index.html */
.hero { position: relative; min-height: 90vh; display: flex; align-items: center; padding-top: 100px; overflow: hidden; }
.hero-container { display: flex; align-items: center; gap: var(--spacing-3xl); width: 100%; }
.hero-content { flex: 1.2; animation: fadeIn 0.8s ease-out forwards; }
.hero-title { font-size: clamp(2.5rem, 5vw, 4rem); margin-bottom: var(--spacing-lg); color: var(--dark-blue); position: relative; line-height: 1.2; }
.hero-title::after { content: ''; position: absolute; bottom: -12px; left: 0; width: 80px; height: 5px; background-color: var(--secondary); border-radius: var(--radius-sm); }
.hero-subtitle { font-size: clamp(1rem, 2.5vw, 1.25rem); margin-bottom: var(--spacing-xl); color: var(--gray); max-width: 600px; }
.hero-buttons { display: flex; gap: var(--spacing-md); margin-top: var(--spacing-xl); flex-wrap: wrap; }
.hero-book { flex: 0.8; position: relative; display: flex; justify-content: center; align-items: center; }
.book-cover { width: clamp(250px, 30vw, 320px); height: auto; aspect-ratio: 2 / 3; background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%); border-radius: var(--radius-md); box-shadow: var(--shadow-book); position: relative; overflow: hidden; transform: perspective(1200px) rotateY(-12deg) rotateX(2deg); transition: transform 0.4s var(--transition-normal); }
.book-cover:hover { transform: perspective(1500px) rotateY(-5deg) rotateX(0deg) scale(1.03); }
.book-content { position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: var(--spacing-lg); color: white; text-align: center; z-index: 1; }
.book-title { font-size: clamp(1.5rem, 4vw, 2rem); margin-bottom: var(--spacing-sm); line-height: 1.2; font-weight: 700; }
.book-author { font-size: clamp(0.875rem, 2vw, 1rem); margin-bottom: var(--spacing-lg); opacity: 0.85; }
.book-cover img { max-width: 60%; height: auto; margin-bottom: var(--spacing-md); }
.book-subtitle-text { font-size: clamp(0.75rem, 1.8vw, 0.875rem); opacity: 0.8; line-height: 1.4; }

/* Episodios Section (index.html) */
.episodes { padding: var(--spacing-3xl) 0; background-color: var(--cream); }
.section-title { /* Ya cubierto por h2 */ text-align: center; }
.section-title::after { /* Estilo de línea centrado para títulos de sección */
    left: 50%; transform: translateX(-50%);
}
.section-subtitle { font-size: clamp(1rem, 2.5vw, 1.2rem); margin-bottom: var(--spacing-2xl); text-align: center; color: var(--gray); max-width: 700px; margin-left: auto; margin-right: auto; }
.episodes-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: var(--spacing-xl); }

/* YouTube Section (index.html) */
.youtube-section { padding: var(--spacing-3xl) 0; background-color: var(--light); /* Alternar fondo */ }
.youtube-container { text-align: center; }
.youtube-embed { position: relative; width: 100%; max-width: 850px; margin: 0 auto var(--spacing-xl); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-xl); aspect-ratio: 16 / 9; /* Para mantener proporción del video */ }
.youtube-embed iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; }
.youtube-cta { margin-top: var(--spacing-xl); } /* Ya .mt-4 existe como clase de utilidad */

/* Future Courses (index.html) */
.future-courses { padding: var(--spacing-3xl) 0; }
.courses-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); gap: var(--spacing-xl); margin-top: var(--spacing-2xl); }