/* --- Variables para Modos Oscuro/Claro --- */
:root {
    --bg-main: #f4f7f9;
    --bg-sidebar: #ffffff;
    --text-color: #1f2937;
    --text-secondary: #6b7280;
    --accent-color: #3b82f6;
    --card-bg: #ffffff;
    --card-hover-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    --border-color: #e5e7eb;
}

[data-theme="dark"] {
    --bg-main: #111827;
    --bg-sidebar: #1f2937;
    --text-color: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent-color: #60a5fa;
    --card-bg: #1f2937;
    --card-hover-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
    --border-color: #374151;
}

/* --- Estilos Generales y Reset --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-color);
    /* Animación de transición para los cambios de tema */
    transition: background-color 0.3s, color 0.3s; 
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
}

/* --- Layout Principal (Dashboard) --- */
#dashboard {
    display: grid;
    grid-template-columns: 250px 1fr; /* 250px para el sidebar */
    min-height: 100vh;
}

/* --- Sidebar --- */
#sidebar {
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 20px 0;
    display: flex;
    flex-direction: column;
    gap: 30px;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.05);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 20px;
    margin-bottom: 20px;
}

.logo span {
    color: var(--accent-color);
    font-size: 28px;
}

.logo h3 {
    font-size: 1.4em;
    font-weight: 700;
}

#sidebar h4 {
    color: var(--text-secondary);
    font-size: 0.85em;
    padding: 0 20px;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-link {
    display: block;
    padding: 8px 20px;
    color: var(--text-secondary);
    font-size: 0.95em;
    transition: background-color 0.2s, color 0.2s;
}

.nav-link:hover {
    background-color: var(--accent-color);
    color: #ffffff;
    font-weight: 600;
}

/* --- Contenido Principal (Main) --- */
#content {
    padding: 30px 40px;
    overflow-y: auto;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 1.8em;
    font-weight: 600;
    color: var(--text-color);
}

#theme-toggle {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px;
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

#theme-toggle:hover {
    background-color: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
}

/* --- Grupos de Tarjetas --- */
.card-group {
    margin-bottom: 40px;
}

.card-group h2 {
    font-size: 1.4em;
    font-weight: 600;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 5px;
}

.card-grid {
    display: grid;
    /* 4 columnas para el 4x2 */
    grid-template-columns: repeat(4, 1fr); 
    gap: 20px;
}

/* --- Tarjeta Individual (4x2: 120x120px) --- */
.card {
    height: 120px;
    width: 100%; /* Adaptable al ancho de la celda */
    padding: 15px;
    background-color: var(--card-bg);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    cursor: pointer;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
    color: var(--text-color);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
    border-color: var(--accent-color);
}

.card span {
    /* Estilo para los iconos */
    font-size: 36px;
    color: var(--accent-color);
    margin-bottom: 5px;
}

.card p {
    font-size: 0.9em;
    font-weight: 500;
    line-height: 1.2;
}

/* Estilos específicos para tarjetas AI */
.ai-card span {
    color: #f59e0b; /* Icono amarillo/naranja */
}

/* Estilos para tarjetas estándar (no enlaces) */
.standard-card {
    opacity: 0.7;
    pointer-events: none; /* No son clickeables */
}
.standard-card span {
     color: var(--text-secondary);
}

/* Responsive básico para pantallas más pequeñas */
@media (max-width: 1200px) {
    .card-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 900px) {
    #dashboard {
        grid-template-columns: 1fr; 
    }
    #sidebar {
        display: none; 
    }
    #content {
        padding: 20px;
    }
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}