/* Estilos generales */
:root {
    --primary-color: #1A3A6E;
    --secondary-color: #C8A951;
    --bg-color: #f7f8fa;
    --text-color: #1f2937;
    --text-muted: #4b5563;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.25s ease-in-out;
}

/* --- RESET Y BASE --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Merriweather', serif;
    font-weight: 700;
    line-height: 1.3;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: var(--secondary-color);
}

/* --- CONTENEDOR PRINCIPAL --- */
.container {
    width: 90%;
    max-width: 1400px;
    margin: 0 auto;
}

/* --- HEADER --- */
header {
    background-color: var(--card-bg);
    padding: 1rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.8rem;
    margin: 0;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-muted);
}

.header-accent {
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
}

/* --- NAVEGACIÓN --- */
nav {
    background-color: #eef1f6;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.main-menu {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    color: var(--text-muted);
}

.menu-item:hover, .menu-item.active {
    background-color: var(--card-bg);
    color: var(--primary-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.menu-item.active {
    border-left: 4px solid var(--secondary-color);
    padding-left: calc(1rem - 4px);
}

.menu-toggle {
    display: none;
    cursor: pointer;
    font-weight: 600;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    align-items: center;
}
.menu-toggle:hover { background-color: rgba(26,58,110,.08); }

/* --- CONTENIDO PRINCIPAL --- */
main {
    padding: 2rem 0;
}

.welcome-banner {
    background: var(--card-bg);
    border-left: 4px solid var(--primary-color);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.welcome-banner h2 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

.welcome-banner p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* --- CONTENEDOR PARA PÁGINAS DE ANCHO COMPLETO --- */
.content-full-width {
    /* Esta clase es para páginas sin sidebar, para que el .document-content ocupe todo el espacio */
}

/* --- CONTENEDOR DE DOCUMENTO CON SIDEBAR (index.html) --- */
.document-container {
    display: grid;
    grid-template-columns: 1fr; /* Default para mobile */
    gap: 2rem;
    align-items: flex-start;
}

.document-sidebar {
    position: sticky;
    top: 140px; /* Ajustar según altura de header+nav */
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.document-sidebar h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 1.2rem;
}

/* Search styles */
.search-container {
    margin-bottom: 1.5rem;
}

#search-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    transition: var(--transition);
}
#search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 58, 110, 0.1);
}

#search-results {
    margin-top: 0.5rem;
    max-height: 200px;
    overflow-y: auto;
}

/* Table of Contents (ToC) */
.toc {
    list-style: none;
}
.toc li a {
    display: block;
    padding: 0.6rem 0.75rem;
    border-radius: 6px;
    color: var(--text-muted);
    font-weight: 600;
    border-left: 3px solid transparent;
}
.toc li a:hover, .toc li a.active {
    background-color: #eef1f6;
    color: var(--primary-color);
    border-left-color: var(--secondary-color);
}

/* --- CONTENEDOR DE DOCUMENTO --- */
.document-content {
    background-color: var(--card-bg);
    padding: 2rem 2.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.document-title {
    color: var(--primary-color);
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.section-title {
    color: var(--secondary-color);
    font-size: 1.6rem;
    margin-bottom: 1rem;
    margin-top: 2.5rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid var(--border-color);
}

.section-reference {
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--text-muted);
    font-style: italic;
}

.article {
    margin-bottom: 1.5rem;
    padding: 1rem;
    border-left: 3px solid var(--secondary-color);
    background-color: #fdfdfd;
    border-radius: 0 4px 4px 0;
}

.article-number {
    color: var(--primary-color);
    font-weight: bold;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 2rem 0;
}

/* --- BOTÓN DE DESCARGA --- */
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;    
    margin-bottom: 1.5rem;
    font-weight: 600;
    gap: 0.5rem;
    box-shadow: var(--shadow);
}

.download-btn:hover {
    background-color: #0f2347;
    transform: translateY(-2px);
    color: white;
}

/* --- TABLAS --- */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    box-shadow: var(--shadow);
}

table th, table td {
    padding: 1rem;
    text-align: left;
    border: 1px solid var(--border-color);
}

table th {
    background-color: var(--primary-color);
    color: white;
    font-family: 'Open Sans', sans-serif;
}

table tbody tr:nth-child(even) {
    background-color: #fdfdfd;
}

table tfoot {
    font-weight: bold;
    background-color: #eef1f6;
}

/* --- FOOTER --- */
footer {
    background-color: var(--text-color);
    color: var(--bg-color);
    padding: 2rem 0;
    margin-top: 3rem;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

/* --- TARJETAS INTERACTIVAS (CONCEPTOS CLAVE) --- */
.concept-grid {
    display: grid;
    grid-template-columns: 1fr; /* 1 columna por defecto para móviles */
    gap: 1.5rem;
    perspective: 1000px; /* Añade perspectiva para el efecto 3D */
}

.concept-card {
    background-color: transparent;
    /* min-height: 250px; */ /* Reemplazado por aspect-ratio */
    aspect-ratio: 4 / 3; /* Mantiene la proporción, haciendo las tarjetas más grandes */
    border-radius: 8px;
    cursor: pointer;
}

.concept-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    box-shadow: var(--shadow);
    border-radius: 8px;
}

.concept-card.is-flipped .concept-card-inner {
    transform: rotateY(180deg);
}

.concept-card-front, .concept-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden; /* Safari */
    backface-visibility: hidden;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
}

.concept-card-front {
    background-color: var(--card-bg);
    color: var(--primary-color);
}

.concept-card-back {
    background-color: var(--primary-color);
    color: var(--card-bg);
    transform: rotateY(180deg);
}

/* --- ACORDEÓN (GUIA.HTML) --- */
.accordion {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.accordion-item {
    border-bottom: 1px solid var(--border-color);
}
.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    background-color: var(--card-bg);
    width: 100%;
    border: none;
    text-align: left;
    padding: 1.25rem 1.5rem;
    font-size: 1.2rem;
    font-family: 'Merriweather', serif;
    font-weight: 700;
    color: var(--primary-color);
    cursor: pointer;
    transition: background-color 0.2s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.accordion-header:hover {
    background-color: #f9fafb;
}

.accordion-header::after {
    content: '\f078'; /* Font Awesome chevron-down */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.9rem;
    transition: transform 0.3s ease;
}

.accordion-header.active::after {
    transform: rotate(180deg); /* chevron-up */
}

.accordion-content {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    background-color: #fdfdfd;
}

/* --- MEDIA QUERIES ADICIONALES PARA REJILLAS --- */
@media (min-width: 600px) {
    .concept-grid {
        grid-template-columns: repeat(2, 1fr); /* 2 columnas para tabletas */
    }
}
@media (min-width: 992px) {
    .concept-grid {
        grid-template-columns: repeat(3, 1fr); /* 3 columnas para escritorio */
    }
}

/* --- RESPONSIVE --- */
@media (max-width: 900px){
    .header-container { flex-direction: column; gap: 0.5rem; }
    .menu-toggle { display: flex; }
    .main-menu { display: none; width: 100%; flex-direction: column; gap: 0.25rem; padding-top: 0.5rem; }
    .main-menu.show { display: flex; }
    .document-content { padding: 1.5rem; }
    .document-container { grid-template-columns: 1fr; }
    .document-sidebar { position: static; } /* Un-stick sidebar on mobile */
}

@media (min-width: 901px) {
    .document-container { grid-template-columns: 280px 1fr; }
}