/* ==========================================================================
   VARIABLES Y CONFIGURACIÓN CORPORATIVA CENEXP
   ========================================================================== */
:root {
    --azul-oscuro: #0B192C;       /* Color base institucional (Tecnológico/Formal) */
    --azul-medio: #1E3E62;        /* Color secundario para interacciones y hover */
    --dorado: #D4AF37;            /* Acentos y detalles de calidad */
    --dorado-hover: #AA8413;      /* Dorado más oscuro para efectos dinámicos */
    --blanco-fondo: #F5F7FA;      /* Fondo limpio para lectura óptima */
    --blanco-puro: #FFFFFF;       /* Fondos de tarjetas y contenedores */
    --texto-oscuro: #1A1A1A;      /* Color de texto principal de alta legibilidad */
    --texto-mutado: #606F7B;      /* Textos secundarios o subtítulos */
    --fuente-principal: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* Reset básico */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--fuente-principal);
    background-color: var(--blanco-fondo);
    color: var(--texto-oscuro);
    line-height: 1.6;
    overflow-x: hidden; /* red de seguridad contra desbordamientos horizontales */
}

/* Imágenes y videos siempre responsivos por defecto */
img, video, iframe {
    max-width: 100%;
    height: auto;
}

/* ==========================================================================
   COMPONENTES GLOBALES (HEADER Y FOOTER)
   ========================================================================== */
.main-header {
    background-color: var(--azul-oscuro);
    color: var(--blanco-puro);
    padding: 1rem 2rem;
    border-bottom: 3px solid var(--dorado); /* Adorno dorado solicitado */
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.logo .material-icons {
    color: var(--dorado);
}

.badge {
    border: 1px solid var(--dorado);
    padding: 0.25rem 0.75rem;
    font-size: 0.85rem;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--blanco-puro);
}

.main-footer {
    background-color: var(--azul-oscuro);
    color: var(--blanco-puro);
    text-align: center;
    padding: 1.5rem;
    font-size: 0.9rem;
    border-top: 2px solid var(--dorado);
    margin-top: auto;
}

/* ==========================================================================
   ESTILOS DE LA PÁGINA DE INICIO (INDEX.HTML)
   ========================================================================== */
.main-container {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.welcome-banner {
    background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-medio));
    color: var(--blanco-puro);
    padding: 2.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border-left: 5px solid var(--dorado);
}

.welcome-banner h2 {
    margin-bottom: 0.5rem;
}

.index-section {
    background-color: var(--blanco-puro);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.index-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--azul-oscuro);
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #E2E8F0;
    padding-bottom: 0.5rem;
}

.index-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.index-item {
    display: flex;
    align-items: center;
    background-color: var(--blanco-fondo);
    padding: 1rem;
    border-radius: 6px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

/* Efecto hover moderno y tecnológico */
.index-item:hover {
    transform: translateX(5px);
    border-left: 3px solid var(--dorado);
    background-color: #EDF2F7;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.item-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--azul-medio);
    margin-right: 1.5rem;
    min-width: 30px;
}

.item-info {
    flex-grow: 1;
    min-width: 0;
}

.item-info h4 {
    color: var(--azul-oscuro);
    margin-bottom: 0.25rem;
}

.item-info p {
    font-size: 0.9rem;
    color: var(--texto-mutado);
}

.arrow {
    color: var(--dorado);
    flex-shrink: 0;
}

/* ==========================================================================
   ESTILOS DE CAPÍTULOS Y MAQUETACIÓN RESPONSIVA (LAYOUT)
   ========================================================================== */
.course-layout {
    display: flex;
    min-height: calc(100vh - 140px); /* Ajuste de altura según header/footer */
}

/* Sidebar de navegación lateral */
.sidebar {
    width: 280px;
    background-color: var(--azul-oscuro);
    color: var(--blanco-puro);
    padding: 2rem 1rem;
    transition: transform 0.3s ease;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sidebar-link {
    display: flex;
    align-items: center;
    color: #A0AEC0;
    text-decoration: none;
    padding: 0.75rem 1rem;
    border-radius: 4px;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.sidebar-link:hover {
    color: var(--blanco-puro);
    background-color: var(--azul-medio);
}

.sidebar-link.active {
    background-color: var(--azul-medio);
    color: var(--dorado);
    font-weight: 600;
    border-right: 3px solid var(--dorado);
}

.home-link {
    color: var(--blanco-puro);
    font-weight: 500;
}

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

.sidebar-section-title {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--dorado);
    letter-spacing: 1px;
    padding-left: 1rem;
    margin-bottom: 0.5rem;
}

.sidebar-num {
    margin-right: 0.7rem;
    font-size: 0.85rem;
    opacity: 0.7;
}

/* Área de contenido del tema */
.content-area {
    flex-grow: 1;
    min-width: 0; /* evita que el contenido fuerce el ancho del layout en móviles */
    padding: 2.5rem;
    background-color: var(--blanco-fondo);
}

.lesson-card {
    background-color: var(--blanco-puro);
    padding: 2.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
}

.lesson-meta {
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--dorado);
    font-weight: 600;
    letter-spacing: 1px;
}

.lesson-title {
    color: var(--azul-oscuro);
    font-size: 2rem;
    margin-top: 0.25rem;
}

.title-divider {
    border: 0;
    height: 2px;
    background-color: var(--blanco-fondo);
    margin: 1.5rem 0;
}

.lesson-content h3 {
    color: var(--azul-medio);
    margin: 2rem 0 1rem 0;
}

.lesson-content p {
    margin-bottom: 1.25rem;
    color: #2D3748;
}

/* Cuadro destacado tecnológico */
.highlight-box {
    display: flex;
    gap: 1rem;
    background-color: var(--blanco-fondo);
    border-left: 4px solid var(--dorado);
    padding: 1.25rem;
    border-radius: 0 6px 6px 0;
    margin: 2rem 0;
}

.box-icon {
    color: var(--azul-medio);
}

/* Botones navegadores */
.lesson-navigation {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: space-between;
    margin-top: 3rem;
    border-top: 1px solid #E2E8F0;
    padding-top: 1.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: background 0.2s;
}

.btn-primary {
    background-color: var(--dorado);
    color: var(--azul-oscuro);
}

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

.btn-secondary {
    background-color: var(--azul-oscuro);
    color: var(--blanco-puro);
}

.btn-secondary:hover {
    background-color: var(--azul-medio);
}

/* Botón responsivo oculto por defecto */
.menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--dorado);
    color: var(--blanco-puro);
    padding: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
}

/* ==========================================================================
   MEDIA QUERIES (RESPONSIVIDAD MÓVIL)
   ========================================================================== */
@media (max-width: 768px) {
    .menu-toggle {
        display: block; /* Aparece el menú hamburguesa en móviles */
    }

    .header-container {
        flex-wrap: wrap;
        row-gap: 8px;
    }

    .logo h1 {
        font-size: 1.1rem;
    }

    .badge {
        font-size: 0.75rem;
        padding: 0.2rem 0.5rem;
    }

    .course-layout {
        position: relative;
    }

    /* Ocultamos el menú lateral en pantallas pequeñas por defecto */
    .sidebar {
        position: absolute;
        left: 0;
        top: 0;
        height: 100%;
        z-index: 99;
        transform: translateX(-100%); /* Oculto a la izquierda */
    }

    /* Clase activa para activar por JavaScript */
    .sidebar.open {
        transform: translateX(0);
    }

    .content-area {
        padding: 1.2rem;
    }

    .lesson-card {
        padding: 1.5rem;
    }

    .lesson-title {
        font-size: 1.5rem;
    }
}

/* ==========================================================================
   COMPONENTES REUTILIZABLES PARA EL CONTENIDO DE LOS CAPÍTULOS
   ========================================================================== */

/* Caja para texto normal (transcrito, sin diseño especial de origen) */
.texto-box {
    background: var(--blanco-fondo);
    border-left: 4px solid var(--dorado);
    border-radius: 0 6px 6px 0;
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    color: #2D3748;
}
.texto-box p { margin-bottom: 0.9rem; color: #2D3748; }
.texto-box p:last-child { margin-bottom: 0; }

/* Caja de definición / concepto destacado (títulos como "Autenticidad", "Integridad", etc.) */
.def-box {
    background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-medio));
    border-radius: 8px;
    padding: 1.75rem 2rem;
    margin: 1.5rem 0;
    color: #F1F5F9;
    box-shadow: 0 6px 15px rgba(11,25,44,0.15);
}
.def-box h4 {
    color: var(--dorado);
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}
.def-box h4 .material-icons { flex-shrink: 0; }
.def-box p { line-height: 1.65; margin: 0; }
.def-box p { color: #F1F5F9; }
.def-box .cita {
    display: block;
    text-align: right;
    margin-top: 1rem;
    font-weight: 700;
    color: var(--dorado);
}

/* Cita textual de documento legal / técnico */
.cita-legal {
    background: #F8FAFC; border: 1px dashed #CBD5E1; border-radius: 6px;
    padding: 16px 20px; margin: 18px 0; font-style: italic; color: #334155; font-size: 0.95rem;
}
.cita-legal strong { font-style: normal; color: var(--azul-oscuro); }

/* Cuadrícula de características cortas (tarjetas estáticas) */
.caracteristicas-grid {
    display: flex; flex-wrap: wrap; gap: 14px; margin: 1.5rem 0;
}
.caracteristica-card {
    flex: 1; min-width: 200px;
    background: #FFFFFF;
    border-top: 3px solid var(--dorado);
    border-radius: 6px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.caracteristica-card h5 {
    color: var(--azul-oscuro); margin-bottom: 8px; font-size: 0.98rem;
    display: flex; align-items: center; flex-wrap: wrap; gap: 6px;
}
.caracteristica-card h5 .material-icons { flex-shrink: 0; }
.caracteristica-card h5 .material-icons { color: var(--dorado); font-size: 1.1rem; }
.caracteristica-card p { margin: 0; font-size: 0.85rem; color: var(--texto-mutado); line-height: 1.5; }

/* Caja de actividad (ejercicio a realizar) */
.activity-box {
    background: #0F172A; border-left: 5px solid var(--dorado);
    border-radius: 4px 8px 8px 4px; padding: 22px; margin: 25px 0;
    color: #F8FAFC; box-shadow: 0 4px 15px rgba(15, 23, 42, 0.15);
}
.activity-box h3 {
    color: var(--dorado); margin-top: 0; margin-bottom: 12px;
    display: flex; align-items: center; flex-wrap: wrap; gap: 8px; font-size: 1.15rem;
}
.activity-box h3 .material-icons { flex-shrink: 0; }
.activity-box ol { padding-left: 1.2rem; margin: 0; }
.activity-box li { margin-bottom: 10px; line-height: 1.55; }
.activity-box li:last-child { margin-bottom: 0; }
.activity-box p { color: #F8FAFC; }

/* Ejemplo visual del valor hash */
.hash-example {
    background: var(--azul-oscuro); border-radius: 8px; padding: 20px 25px;
    margin: 1.5rem 0; color: #fff; display: flex; flex-wrap: wrap; gap: 30px; align-items: center;
}
.hash-example .hash-diagrama { flex: 1; min-width: 200px; }
.hash-example .hash-fila { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; margin-bottom: 6px; font-family: 'Courier New', monospace; }
.hash-example .hash-fila .archivo { background: #1E3E62; padding: 4px 10px; border-radius: 4px; font-size: 0.85rem; }
.hash-example .hash-fila .flecha-hash { color: var(--dorado); font-size: 0.8rem; }
.hash-example .hash-fila .valor { color: var(--dorado); font-weight: 700; font-size: 0.85rem; }
.hash-example .hash-copia { font-size: 0.75rem; color: #94A3B8; margin: 2px 0 6px 14px; }
.hash-example .hash-texto { flex: 1; min-width: 200px; }
.hash-example .hash-texto h4 { color: var(--dorado); margin-bottom: 8px; }
.hash-example .hash-texto p { margin: 0; font-size: 0.88rem; color: #E2E8F0; line-height: 1.5; }

/* Nota sobre espacio reservado para video */
.video-placeholder-note {
    font-size: 0.8rem; color: var(--texto-mutado); font-style: italic;
    margin: 0.5rem 0; display: flex; align-items: center; gap: 6px;
}
.video-placeholder-note .material-icons { font-size: 1rem; color: var(--dorado); }

/* Acordeón vertical de fases/pasos (se abren uno por uno, con flecha conectora) */
.fases-vertical { margin: 1.5rem 0; }
.fase-item {
    border-radius: 8px; overflow: hidden; margin-bottom: 4px;
    box-shadow: 0 3px 8px rgba(11,25,44,0.12);
}
.fase-header {
    cursor: pointer; color: #fff; padding: 14px 20px;
    display: flex; align-items: center; flex-wrap: wrap; gap: 12px; user-select: none;
    font-weight: 700; letter-spacing: 0.3px;
    transition: filter 0.2s;
}
.fase-header .fase-num { flex-shrink: 0; }
.fase-header:hover { filter: brightness(1.1); }
.fase-header .fase-num {
    background: rgba(255,255,255,0.18); border-radius: 50%;
    width: 30px; height: 30px; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center; font-size: 0.9rem;
}
.fase-header .material-icons.chevron { margin-left: auto; transition: transform 0.25s; color: var(--dorado); }
.fase-item.abierto .fase-header .material-icons.chevron { transform: rotate(180deg); }
.fase-panel { max-height: 0; overflow: hidden; background: #EAF1FA; transition: max-height 0.3s ease; }
.fase-item.abierto .fase-panel { max-height: 3000px; }
.fase-panel p { margin: 0; padding: 16px 20px; font-size: 0.9rem; color: #2D3748; line-height: 1.55; }
.fase-flecha-conectora {
    display: flex; justify-content: center; color: var(--dorado); font-size: 1.4rem; margin: -2px 0;
}

/* Referencias bibliográficas pequeñas dentro de un def-box */
.def-box .referencias {
    margin-top: 1rem; padding-top: 0.75rem; border-top: 1px solid rgba(255,255,255,0.2);
    font-size: 0.72rem; color: #CBD5E1; line-height: 1.5;
}

/* Recuadro amarillo/dorado para citas textuales de leyes, tesis y jurisprudencia */
.cita-normativa {
    background: #FBF3D9;
    border: 1px solid #E6C866;
    border-left: 5px solid var(--dorado);
    border-radius: 0 8px 8px 0;
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    color: #4A3F1A;
}
.cita-normativa .cita-titulo {
    display: block; font-weight: 700; color: var(--azul-oscuro);
    margin-bottom: 0.6rem; text-transform: uppercase; font-size: 0.92rem; letter-spacing: 0.2px;
}
.cita-normativa .cita-subtitulo {
    display: block; text-align: center; font-weight: 700; color: var(--azul-oscuro);
    margin-bottom: 0.8rem;
}
.cita-normativa p { margin: 0 0 0.8rem 0; font-size: 0.92rem; line-height: 1.6; color: #4A3F1A; }
.cita-normativa p:last-child { margin-bottom: 0; }

/* Espacio reservado para capturas de pantalla (fondo azul institucional) */
.captura-placeholder {
    background: linear-gradient(135deg, var(--azul-medio), var(--azul-oscuro));
    border-radius: 8px;
    min-height: 220px;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    color: #fff; margin: 0.75rem 0 1.75rem 0; gap: 8px; text-align: center; padding: 20px;
}
.captura-placeholder .material-icons { font-size: 2.5rem; color: var(--dorado); overflow-wrap: break-word; width: 100%; }
.captura-placeholder .nombre-captura { font-weight: 700; font-size: 1rem; max-width: 100%; width: 100%; overflow-wrap: break-word; word-break: break-word; }
.captura-placeholder .instruccion-captura { font-size: 0.8rem; color: #CBD5E1; max-width: 100%; width: 100%; overflow-wrap: break-word; word-break: break-word; }

/* Barras horizontales de información (etiqueta + descripción) */
.barras-info { margin: 1.25rem 0; display: flex; flex-direction: column; gap: 10px; }
.barra-info {
    display: flex; align-items: stretch; border-radius: 6px; overflow: hidden;
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}
.barra-info .barra-etiqueta {
    background: var(--azul-oscuro); color: var(--dorado); font-weight: 700;
    padding: 16px 20px; display: flex; align-items: center; min-width: 190px;
    font-size: 0.95rem; flex-shrink: 0;
}
.barra-info .barra-descripcion {
    background: #EAF1F8; color: #1E293B; padding: 16px 20px; display: flex; align-items: center;
    font-size: 0.9rem; line-height: 1.5;
}
@media (max-width: 700px) {
    .barra-info { flex-direction: column; }
    .barra-info .barra-etiqueta { min-width: unset; }
}


/* Distribución en dos columnas para pantallas grandes */
.landing-layout {
    display: grid;
    grid-template-columns: 1.6fr 1.1fr;
    gap: 2.5rem;
    max-width: 1200px;
    margin: 2rem auto;
    align-items: start;
}

.course-main-title {
    color: var(--azul-oscuro);
    font-size: 2.3rem;
    line-height: 1.2;
}

/* Contenedor de Video Responsivo (Mantiene proporción 16:9) */
.video-responsive-container {
    position: relative;
    padding-bottom: 56.25%; /* Relación de aspecto 16:9 */
    height: 0;
    overflow: hidden;
    background-color: #000;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    margin-bottom: 2rem;
    border: 1px solid var(--azul-medio);
}

.video-responsive-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Tarjetas de datos rápidos */
.quick-facts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.fact-card {
    background-color: var(--blanco-puro);
    padding: 1rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-bottom: 3px solid var(--dorado);
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    min-width: 0;
}
.fact-card > div { min-width: 0; }
.fact-card p, .fact-card strong { overflow-wrap: break-word; word-break: break-word; }
.fact-card .material-icons { flex-shrink: 0; }

.fact-card .material-icons {
    color: var(--azul-medio);
    font-size: 2rem;
}

.fact-card strong {
    color: var(--azul-oscuro);
    display: block;
    font-size: 0.9rem;
}

.fact-card p {
    font-size: 0.85rem;
    margin: 0;
    color: var(--texto-mutado);
}

/* Tarjeta del Formulario de Login */
.login-sidebar {
    position: sticky;
    top: 100px;
}

.login-card {
    background-color: var(--azul-oscuro);
    color: var(--blanco-puro);
    padding: 2.5rem 2rem;
    border-radius: 8px;
    border-top: 4px solid var(--dorado);
    box-shadow: 0 10px 25px rgba(11, 25, 44, 0.2);
}

.pixkay-brand {
    text-align: center;
    margin-bottom: 2rem;
}

.pixkay-brand h3 {
    font-size: 1.4rem;
    letter-spacing: 1px;
    color: var(--blanco-puro);
    margin-top: 0.5rem;
}

.pixkay-brand p {
    font-size: 0.85rem;
    color: #A0AEC0;
    margin-top: 0.25rem;
}

.text-gold {
    color: var(--dorado);
    font-size: 2.5rem;
}

/* Elementos de Formulario Modernos */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    color: #E2E8F0;
}

.input-icon-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--texto-mutated);
    font-size: 1.2rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem 0.75rem 0.75rem 35px;
    border-radius: 4px;
    border: 1px solid var(--azul-medio);
    background-color: #112240;
    color: var(--blanco-puro);
    font-size: 0.95rem;
    transition: all 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--dorado);
    box-shadow: 0 0 0 2px rgba(212, 175, 55, 0.2);
}

.btn-block {
    width: 100%;
    justify-content: center;
    margin-top: 1rem;
    cursor: pointer;
}

/* Mensajes de error */
.error-message {
    background-color: #742A2A;
    color: #FFF5F5;
    padding: 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Responsividad para móviles en la Landing */
@media (max-width: 900px) {
    .landing-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .course-info-section, .login-sidebar {
        min-width: 0;
    }
    .login-sidebar {
        position: static;
    }
    .quick-facts {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   ANIMACIONES Y EFECTOS VISUALES REFORZADOS
   (Curso "Cadena de Custodia para Evidencia Digital" y sucesivos)
   ========================================================================== */

/* Entrada escalonada (fade + slide-up) para tarjetas y secciones */
@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(22px); }
    to   { opacity: 1; transform: translateY(0); }
}
.anim-entrada {
    opacity: 0;
    animation: fadeSlideUp 0.7s ease forwards;
}
.anim-d1 { animation-delay: 0.05s; }
.anim-d2 { animation-delay: 0.15s; }
.anim-d3 { animation-delay: 0.25s; }
.anim-d4 { animation-delay: 0.35s; }
.anim-d5 { animation-delay: 0.45s; }
.anim-d6 { animation-delay: 0.55s; }

/* Brillo dorado pulsante para el badge del header */
@keyframes pulseDorado {
    0%, 100% { box-shadow: 0 0 0 0 rgba(212,175,55,0.45); }
    50%      { box-shadow: 0 0 0 6px rgba(212,175,55,0); }
}
.badge-pulso { animation: pulseDorado 2.4s ease-in-out infinite; }

/* Efecto "escaneo": línea de luz diagonal que cruza la tarjeta al pasar el mouse */
.card-escaneo {
    position: relative;
    overflow: hidden;
}
.card-escaneo::before {
    content: "";
    position: absolute;
    top: 0; left: -60%;
    width: 40%; height: 100%;
    background: linear-gradient(120deg, transparent, rgba(212,175,55,0.28), transparent);
    transform: skewX(-20deg);
    transition: left 0.6s ease;
    pointer-events: none;
}
.card-escaneo:hover::before { left: 120%; }

/* Tarjeta con glow dorado creciente al hover (para fact-card y similares) */
.card-glow {
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.card-glow:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(212,175,55,0.25), 0 4px 10px rgba(0,0,0,0.06);
}

/* Contador numérico animado (se anima vía JS cambiando el contenido) */
.contador-animado {
    font-variant-numeric: tabular-nums;
}

/* Borde dorado tipo "trazo" que se dibuja alrededor de la tarjeta de login al cargar */
@keyframes trazoDorado {
    from { border-image-width: 0; opacity: 0; }
    to   { opacity: 1; }
}
.login-card.anim-entrada {
    animation: fadeSlideUp 0.8s ease forwards, trazoDorado 1.2s ease forwards;
}

/* Botones con efecto ripple al hacer clic */
.btn-ripple {
    position: relative;
    overflow: hidden;
}
.btn-ripple .ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255,255,255,0.55);
    transform: scale(0);
    animation: rippleAnim 0.6s ease-out;
    pointer-events: none;
}
@keyframes rippleAnim {
    to { transform: scale(3); opacity: 0; }
}

/* Icono del fact-card con leve "latido" continuo */
@keyframes latido {
    0%, 100% { transform: scale(1); }
    50%      { transform: scale(1.12); }
}
.icono-latido { animation: latido 2.8s ease-in-out infinite; }

/* Respeta a usuarios que prefieren menos movimiento */
@media (prefers-reduced-motion: reduce) {
    .anim-entrada, .badge-pulso, .icono-latido, .login-card.anim-entrada {
        animation: none !important;
        opacity: 1 !important;
    }
    .card-escaneo::before { display: none; }
}

/* ==========================================================================
   COMPONENTES ADICIONALES — Curso "Cadena de Custodia para Evidencia Digital"
   (comparativas VS, diagramas circulares, banners de portada, efectos extra)
   ========================================================================== */

/* Banner oscuro de portada de capítulo (título sobre imagen, estilo "REC/PLAY") */
.cap-portada-banner {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    margin: 0.5rem 0 1.75rem 0;
    box-shadow: 0 6px 18px rgba(11,25,44,0.25);
}
.cap-portada-banner img {
    display: block;
    width: 100%;
    filter: grayscale(15%);
}
.cap-portada-banner .cap-portada-titulo {
    position: absolute;
    top: 0; left: 0; right: 0;
    background: var(--azul-oscuro);
    color: #4EA8FF;
    font-weight: 800;
    letter-spacing: 0.5px;
    padding: 14px 20px;
    font-size: 1rem;
    text-transform: uppercase;
    border-bottom: 3px solid var(--dorado);
}

/* Ribbon / listón de título (ej. "Diferencias entre") */
.ribbon-titulo-wrap { display: flex; justify-content: center; margin: 1.75rem 0 1.25rem; }
.ribbon-titulo {
    position: relative;
    background: var(--azul-oscuro);
    color: #fff;
    font-weight: 800;
    font-size: 1.3rem;
    padding: 12px 40px;
    border-radius: 4px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}
.ribbon-titulo::before, .ribbon-titulo::after {
    content: "";
    position: absolute;
    top: 0;
    border: 20px solid var(--azul-oscuro);
    filter: brightness(0.75);
}
.ribbon-titulo::before { left: -18px; border-left-color: transparent; }
.ribbon-titulo::after { right: -18px; border-right-color: transparent; }

/* Comparativa "VS" de dos columnas (ej. Cadena de Custodia vs Cadena de Custodia Digital) */
.comparativa-vs {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: start;
    gap: 1.5rem;
    margin: 1.5rem 0 2rem;
}
.comparativa-vs .columna-vs { display: flex; flex-direction: column; gap: 10px; }
.comparativa-vs .col-titulo {
    color: #fff; text-align: center; font-weight: 800; padding: 12px;
    border-radius: 999px; font-size: 1.05rem; box-shadow: 0 3px 8px rgba(0,0,0,0.15);
}
.comparativa-vs .col-azul .col-titulo { background: linear-gradient(135deg, var(--azul-medio), var(--azul-oscuro)); }
.comparativa-vs .col-naranja .col-titulo { background: linear-gradient(135deg, #E8873A, #C4621A); }
.comparativa-vs .item-vs {
    background: #fff; border-radius: 8px; padding: 10px 14px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.06); font-size: 0.88rem; text-align: center; font-weight: 600;
    color: var(--texto-oscuro);
}
.comparativa-vs .col-azul .item-vs { border-top: 3px solid var(--azul-medio); }
.comparativa-vs .col-naranja .item-vs { border-top: 3px solid #E8873A; }
.comparativa-vs .item-vs .sub {
    display: block; font-weight: 400; font-size: 0.78rem; color: var(--texto-mutado); margin-top: 3px;
}
.comparativa-vs .vs-circulo {
    align-self: center;
    width: 60px; height: 60px; border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #fff, #cbd5e1);
    display: flex; align-items: center; justify-content: center;
    font-weight: 900; font-size: 1.1rem; color: var(--azul-oscuro);
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    border: 3px solid var(--dorado);
}
.comparativa-vs .enfoque-final {
    grid-column: 1 / -1;
    display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-top: 0.5rem;
}
.comparativa-vs .enfoque-final .enfoque-tag {
    color: #fff; text-align: center; font-weight: 700; padding: 10px; border-radius: 4px; font-size: 0.9rem;
}
.comparativa-vs .col-azul ~ .enfoque-final .enfoque-tag:first-child,
.enfoque-final .enfoque-azul { background: var(--azul-medio); }
.enfoque-final .enfoque-naranja { background: #E8873A; }
@media (max-width: 700px) {
    .comparativa-vs { grid-template-columns: 1fr; }
    .comparativa-vs .vs-circulo { margin: 0 auto; }
    .comparativa-vs .enfoque-final { grid-template-columns: 1fr; }
}

/* Diagrama circular de trazabilidad (nodo central + nodos alrededor conectados) */
.trazabilidad-diagrama {
    position: relative;
    max-width: 480px;
    margin: 2rem auto;
    aspect-ratio: 1 / 1;
}
.trazabilidad-diagrama .nodo-central {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    background: var(--azul-oscuro); color: var(--dorado); border-radius: 10px;
    padding: 14px 18px; font-weight: 700; font-size: 0.85rem; text-align: center;
    box-shadow: 0 6px 16px rgba(11,25,44,0.3); z-index: 2; border: 2px solid var(--dorado);
}
.trazabilidad-diagrama .nodo-orbita {
    position: absolute;
    display: flex; flex-direction: column; align-items: center; gap: 6px;
    text-align: center; z-index: 2;
}
.trazabilidad-diagrama .nodo-orbita .icono-circulo {
    width: 54px; height: 54px; border-radius: 50%;
    background: linear-gradient(135deg, var(--azul-medio), var(--azul-oscuro));
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.18);
    transition: transform 0.25s;
}
.trazabilidad-diagrama .nodo-orbita:hover .icono-circulo { transform: scale(1.12); }
.trazabilidad-diagrama .nodo-orbita .icono-circulo .material-icons { color: var(--dorado); font-size: 1.5rem; }
.trazabilidad-diagrama .nodo-orbita span.etiqueta { font-size: 0.78rem; font-weight: 700; color: var(--azul-oscuro); }
.trazabilidad-diagrama svg.conectores { position: absolute; inset: 0; z-index: 1; }
.trazabilidad-diagrama svg.conectores path {
    stroke: var(--dorado); stroke-width: 2; fill: none; stroke-dasharray: 6 5; opacity: 0.6;
}

/* Efecto "typewriter" para frases/definiciones destacadas cortas */
@keyframes typewriter {
    from { width: 0; }
    to   { width: 100%; }
}
.efecto-typewriter {
    display: inline-block;
    overflow: hidden;
    white-space: nowrap;
    border-right: 2px solid var(--dorado);
    animation: typewriter 2s steps(40, end) forwards, parpadeoCursor 0.75s step-end infinite;
}
@keyframes parpadeoCursor { 50% { border-color: transparent; } }

/* Tarjeta flip (concepto por un lado / definición-ejemplo por el otro) */
.flip-card { perspective: 1000px; min-height: 160px; margin: 1rem 0; }
.flip-card-inner {
    position: relative; width: 100%; height: 100%; min-height: 160px;
    transition: transform 0.6s; transform-style: preserve-3d; cursor: pointer;
}
.flip-card:hover .flip-card-inner, .flip-card.flipped .flip-card-inner { transform: rotateY(180deg); }
.flip-card-front, .flip-card-back {
    position: absolute; width: 100%; height: 100%; min-height: 160px;
    backface-visibility: hidden; border-radius: 8px; padding: 1.25rem;
    display: flex; flex-direction: column; justify-content: center;
}
.flip-card-front {
    background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-medio));
    color: #F1F5F9;
}
.flip-card-front h5 { color: var(--dorado); margin-bottom: 6px; }
.flip-card-back {
    background: #fff; border: 2px solid var(--dorado); color: var(--texto-oscuro);
    transform: rotateY(180deg); font-size: 0.88rem;
}

/* Timeline con trazo que se dibuja progresivamente al hacer scroll (línea vertical) */
.timeline-trazo { position: relative; margin: 1.75rem 0; padding-left: 40px; }
.timeline-trazo::before {
    content: ""; position: absolute; left: 14px; top: 0; bottom: 0; width: 3px;
    background: linear-gradient(to bottom, var(--dorado), var(--azul-medio));
    border-radius: 3px;
}
.timeline-trazo .paso-trazo { position: relative; margin-bottom: 1.5rem; }
.timeline-trazo .paso-trazo::before {
    content: ""; position: absolute; left: -33px; top: 4px;
    width: 16px; height: 16px; border-radius: 50%;
    background: var(--dorado); border: 3px solid var(--azul-oscuro);
}
.timeline-trazo .paso-trazo h5 { color: var(--azul-oscuro); margin-bottom: 4px; }
.timeline-trazo .paso-trazo p { font-size: 0.88rem; color: var(--texto-mutado); margin: 0; }

/* Barra de progreso animada tipo "verificación de hash" para simuladores */
@keyframes barraVerificacion {
    from { width: 0%; }
}
.barra-verificacion-hash {
    background: #E2E8F0; border-radius: 999px; height: 10px; overflow: hidden; margin: 8px 0;
}
.barra-verificacion-hash .relleno {
    height: 100%; border-radius: 999px;
    background: linear-gradient(90deg, var(--dorado), #4EA8FF);
    animation: barraVerificacion 1.4s ease forwards;
}

/* Chip animado con glow dorado al hover (para listas de conceptos cortos) */
.mini-chip {
    display: inline-flex; align-items: center; gap: 6px;
    background: #EAF1F8; color: var(--azul-oscuro); font-weight: 600; font-size: 0.82rem;
    padding: 6px 14px; border-radius: 999px; margin: 3px; transition: all 0.25s;
    border: 1px solid transparent;
}
.mini-chip:hover {
    background: #fff; border-color: var(--dorado);
    box-shadow: 0 0 10px rgba(212,175,55,0.4);
    transform: translateY(-2px);
}

/* ==========================================================================
   DESCARGAS DE CAPÍTULO (PDFs y materiales de referencia)
   ========================================================================== */
.descargas-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px; margin: 1.25rem 0 1.75rem 0;
}
.descarga-card {
    display: flex; align-items: center; gap: 12px;
    background: #F8FAFC; border: 1px solid #E2E8F0; border-left: 4px solid var(--dorado);
    border-radius: 8px; padding: 14px 16px; text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.descarga-card:hover {
    transform: translateY(-3px); box-shadow: 0 8px 18px rgba(11,25,44,0.12);
    border-left-color: var(--azul-medio);
}
.descarga-card .material-icons.descarga-icon {
    color: #DC2626; font-size: 2rem; flex-shrink: 0;
}
.descarga-card .descarga-info h5 { margin: 0 0 3px 0; color: var(--azul-oscuro); font-size: 0.92rem; }
.descarga-card .descarga-info p { margin: 0; font-size: 0.78rem; color: var(--texto-mutado); }
.descarga-card .material-icons.descarga-download { margin-left: auto; color: var(--azul-medio); flex-shrink: 0; }

/* Simulador embebido: contenedor sin scroll propio, adaptado al ancho de la lección */
.simulador-embed {
    border: 1px solid #E2E8F0; border-radius: 10px; overflow: hidden;
    margin: 1.5rem 0; box-shadow: 0 4px 14px rgba(11,25,44,0.08);
}
.simulador-embed .simulador-titulo {
    background: var(--azul-oscuro); color: var(--dorado); font-weight: 700;
    padding: 10px 16px; font-size: 0.85rem; display: flex; align-items: center; gap: 8px;
}

/* Variante de portada de capítulo sin foto: fondo degradado + icono temático grande */
.cap-portada-banner .cap-portada-visual {
    height: 220px; position: relative; overflow: hidden;
    background: linear-gradient(135deg, #0B192C 0%, #16243B 55%, #1E3A5F 100%);
    display: flex; align-items: center; justify-content: center;
}
.cap-portada-banner .cap-portada-visual::before {
    content: "01001010 11010101 00110101 10101100 01011010 11001010";
    position: absolute; inset: 0; color: rgba(255,255,255,0.05);
    font-family: 'Courier New', monospace; font-size: 1.4rem; line-height: 2.2rem;
    letter-spacing: 6px; padding: 10px; overflow: hidden; white-space: pre-wrap; word-break: break-all;
}
.cap-portada-banner .cap-portada-visual .material-icons.icono-portada {
    font-size: 6rem; color: var(--dorado); opacity: 0.9; position: relative; z-index: 1;
    filter: drop-shadow(0 4px 10px rgba(0,0,0,0.4));
}
@media (max-width: 700px) {
    .cap-portada-banner .cap-portada-visual { height: 150px; }
    .cap-portada-banner .cap-portada-visual .material-icons.icono-portada { font-size: 3.6rem; }
}

/* ==========================================================================
   PORTADA E IMAGEN DE VIDEO DE CAPÍTULO (según diseño original del curso)
   ========================================================================== */
.img-portada {
    width: 100%; max-width: 1100px; height: auto; display: block;
    margin: 0 auto 22px auto; border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}
.video-adaptive-container {
    position: relative; border-radius: 8px; overflow: hidden;
    background-color: #000; box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    margin: 0 0 22px 0; border: 1px solid var(--azul-medio);
    aspect-ratio: 16 / 9; width: 100%;
}
.video-adaptive-container video { width: 100%; height: 100%; display: block; object-fit: cover; }

/* Simulador embebido directamente (sin iframe), acotado con clase .sim-capN */
.simulador-inline {
    border: 1px solid #E2E8F0; border-radius: 10px; overflow: hidden;
    margin: 1.5rem 0; box-shadow: 0 4px 14px rgba(11,25,44,0.08);
}
.simulador-inline .simulador-titulo {
    background: var(--azul-oscuro); color: var(--dorado); font-weight: 700;
    padding: 10px 16px; font-size: 0.85rem; display: flex; align-items: center; gap: 8px;
}
.simulador-inline .simulador-cuerpo { padding: 14px; overflow-x: auto; }

/* ==========================================================================
   QUIZ DEL CAPÍTULO (diseño original — antes solo vivía en el HTML de referencia,
   se traslada aquí para que todos los capítulos lo hereden correctamente)
   ========================================================================== */
.quiz-section { background:#FFFFFF; border:1px solid #E2E8F0; border-radius:8px; padding:25px; margin-top:30px; }
.student-info { background:#F1F5F9; padding:15px; border-radius:6px; margin-bottom:25px; }
.student-info input { width:100%; max-width:400px; padding:8px; border:1px solid #CBD5E1; border-radius:4px; }
.quiz-question { display:none; margin-bottom:20px; padding:20px; background:#fdfdfd; border-radius:8px; border:1px solid #f1f1f1; }
.quiz-question.active { display:block; }
.quiz-question p { font-weight:600; margin-bottom:15px; color:#334155; font-size:1.1rem; }
.quiz-options { display:flex; flex-direction:column; gap:10px; }
.quiz-options label { display:flex; align-items:flex-start; gap:10px; padding:12px; background:#F8FAFC; border:1px solid #E2E8F0; border-radius:6px; cursor:pointer; transition:all 0.2s; }
.quiz-options label input { flex-shrink:0; margin-top:3px; }
.quiz-options label:hover { background:#F1F5F9; border-color:#D4AF37; }
.quiz-progress { font-size:0.9rem; color:#64748B; margin-bottom:10px; font-weight:600; }
.quiz-results { margin-top:25px; padding:20px; border-radius:6px; display:none; text-align:center; }
.results-approved { background-color:#DCFCE7; color:#14532D; border:1px solid #BBF7D0; }
.results-failed { background-color:#FEE2E2; color:#7F1D1D; border:1px solid #FCA5A5; }
.quiz-nav-buttons { display:flex; flex-wrap:wrap; justify-content:space-between; margin-top:20px; gap:10px; }

/* ==========================================================================
   TABLAS COMPARATIVAS (diseño original — mismo motivo que el bloque anterior)
   ========================================================================== */
.tabla-comparativa-wrap { overflow-x:auto; margin:1rem 0 1.5rem 0; border-radius:8px; box-shadow:0 2px 8px rgba(0,0,0,0.06); }
.tabla-comparativa { width:100%; border-collapse:collapse; font-size:0.84rem; min-width:520px; }
.tabla-comparativa th { background:var(--azul-oscuro); color:var(--dorado); text-align:left; padding:10px 14px; font-size:0.8rem; text-transform:uppercase; letter-spacing:0.3px; }
.tabla-comparativa td { padding:10px 14px; border-bottom:1px solid #E2E8F0; vertical-align:top; color:#2D3748; }
.tabla-comparativa tbody tr:nth-child(even) { background:#F8FAFC; }
.tabla-comparativa tbody tr:last-child td { border-bottom:none; }

/* ==========================================================================
   FONDO DE LOS ENCABEZADOS DE ACORDEÓN (antes definido solo por capítulo en la
   referencia; sin esto el texto blanco quedaba invisible sobre fondo blanco)
   ========================================================================== */
.fase-header { background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-medio)); }

/* Placeholder de video de capítulo (hasta que se agregue el archivo real en videos/) */
.video-placeholder {
    position: relative; width: 100%; aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, #0B192C 0%, #16243B 60%, #1E3A5F 100%);
    border-radius: 8px; overflow: hidden; margin: 0 0 22px 0;
    border: 1px solid var(--azul-medio); box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 10px;
}
.video-placeholder .material-icons.play-icon {
    font-size: 4.2rem; color: var(--dorado); opacity: 0.95;
    filter: drop-shadow(0 3px 8px rgba(0,0,0,0.4));
    transition: transform 0.2s;
}
.video-placeholder:hover .material-icons.play-icon { transform: scale(1.08); }
.video-placeholder .video-placeholder-texto {
    color: #CBD5E1; font-size: 0.82rem; letter-spacing: 0.3px; text-align: center; padding: 0 14px;
}
@media (max-width: 700px) {
    .video-placeholder .material-icons.play-icon { font-size: 3rem; }
}