:root {
    --primary-color: #0F172A;
    --secondary-color: #1E293B;
    --accent-color: #2563EB;
    --accent-hover: #1D4ED8;
    --bg-color: #F8FAFC;
    --card-bg: #FFFFFF;
    --text-color: #334155;
    --text-muted: #64748B;
    --border-color: #E2E8F0;
    --danger-color: #EF4444;
    --success-color: #10B981;
    --warning-color: #F59E0B;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header & Navbar */
.site-header {
    background-color: var(--primary-color);
    color: #FFFFFF;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    flex-wrap: wrap;
    gap: 1rem;
}

.brand-title {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: #FFFFFF;
    text-decoration: none;
}

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

.user-nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-nav span {
    font-size: 0.9rem;
    color: #94A3B8;
}

/* Botones Principales y de Navegación */
.btn-header-nav {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: #E2E8F0;
    background-color: #334155;
    padding: 0.45rem 0.85rem;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s ease;
    border: 1px solid #475569;
}

.btn-header-nav:hover {
    background-color: var(--accent-color);
    color: #FFFFFF;
    border-color: var(--accent-color);
}

.btn-logout {
    color: #F8FAFC;
    background-color: #334155;
    padding: 0.45rem 0.85rem;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.85rem;
    transition: background 0.2s;
    border: 1px solid #475569;
}

.btn-logout:hover {
    background-color: var(--danger-color);
    border-color: var(--danger-color);
}

/* Barra del Sub-Menu Global */
.sub-header-bar {
    background-color: #1E293B;
    padding: 0.5rem 2rem;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0.75rem;
    border-top: 1px solid #334155;
}

/* Layout Principal */
.main-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem;
}

/* Contenedores de Módulo */
.module-container {
    width: 100%;
    max-width: 1100px;
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
}

.module-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}

.module-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.btn-action {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1.2rem;
    background-color: var(--accent-color);
    color: #FFFFFF;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: background-color 0.2s;
    border: none;
    cursor: pointer;
}

.btn-action:hover {
    background-color: var(--accent-hover);
}

.btn-secondary {
    background-color: #64748B;
    color: #FFFFFF;
}

.btn-secondary:hover {
    background-color: #475569;
}

.btn-outline {
    background-color: transparent;
    color: var(--secondary-color);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background-color: #F1F5F9;
    border-color: #CBD5E1;
}

.btn-sm {
    padding: 0.35rem 0.7rem;
    font-size: 0.8rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    margin-right: 0.3rem;
}

.btn-edit {
    background-color: #3B82F6;
    color: #FFF;
}

.btn-delete {
    background-color: var(--danger-color);
    color: #FFF;
}

/* Tablas */
.table-responsive {
    overflow-x: auto;
}

.custom-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    font-size: 0.9rem;
}

.custom-table th, .custom-table td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.custom-table th {
    background-color: #F1F5F9;
    color: var(--secondary-color);
    font-weight: 700;
}

.custom-table tr:hover {
    background-color: #F8FAFC;
}

/* Badges / Insignias */
.badge {
    padding: 0.25rem 0.6rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-success {
    background-color: #D1FAE5;
    color: #065F46;
}

.badge-danger {
    background-color: #FEE2E2;
    color: #991B1B;
}

/* Formularios GRID */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.form-group-full {
    grid-column: span 2;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    background-color: #F8FAFC;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    background-color: #FFFFFF;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Mensajes y Alertas */
.alert-success {
    background-color: #ECFDF5;
    border: 1px solid #A7F3D0;
    color: #065F46;
    padding: 0.85rem;
    border-radius: 8px;
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
}

/* Footer Requerido */
.site-footer {
    background-color: var(--primary-color);
    color: #94A3B8;
    text-align: center;
    padding: 1rem;
    font-size: 0.85rem;
    border-top: 1px solid #334155;
    margin-top: auto;
}

.site-footer a {
    color: #38BDF8;
    text-decoration: none;
    font-weight: 600;
}

.site-footer a:hover {
    color: #7DD3FC;
    text-decoration: underline;
}