:root {
    --sentinel-black: #111;
    --sentinel-blue: #007bff;
    --sentinel-blue-hover: #0056b3;
    /* Menú lateral: ítem activo (mismo criterio que submenú, sin azul primario) */
    --sentinel-nav-active-bg: rgba(0, 0, 0, 0.35);
    --sentinel-nav-active-color: #ffffff;
}

.main-header.navbar {
    background-color: #222 !important;
    border-bottom: none !important;
    box-shadow: none !important;
    min-height: calc(3.5rem + 1px) !important;
    height: calc(3.5rem + 1px) !important;
    padding-top: 0 !important;
    padding-bottom: 0 !important;
}

.main-header .nav-link {
    color: #fff !important;
}

.main-sidebar,
.brand-link {
    background-color: #222 !important;
}

.main-sidebar {
    background-color: #333 !important;
}

.main-sidebar .nav-link,
.brand-link .brand-text {
    color: #fff !important;
}

/* Marca SENTINEL: negrita (AdminLTE usa font-weight-light en el span) */
.main-sidebar .brand-text {
    font-weight: 700 !important;
}

/* Logo junto a SENTINEL: círculo negro + mismo SVG que el login */
.main-sidebar .brand-link .brand-image.sentinel-brand-logo-img,
.navbar-brand .brand-image.sentinel-brand-logo-img {
    background-color: #000 !important;
    box-shadow: none !important;
    padding: 6px !important;
    width: 36px !important;
    height: 36px !important;
    max-height: none !important;
    object-fit: contain;
    opacity: 1 !important;
}

/* Título del área principal (content header) */
.content-header h1 {
    font-weight: 700 !important;
}

/* Menú lateral: primer ítem (Dashboard) más abajo, espacio respecto al bloque superior */
.main-sidebar .sidebar > nav {
    margin-top: 30px !important;
}

/*
 * AdminLTE marca el padre del treeview como "active" cuando un hijo coincide.
 * Dejamos el acento solo en el hijo (p. ej. Pasajeros), no en "Configuraciones".
 */
.main-sidebar .nav-item.has-treeview > .nav-link.active {
    background-color: transparent !important;
    color: rgba(255, 255, 255, 0.85) !important;
}

/* Ítems activos del menú (Dashboard, Automatizaciones, Pasajeros, etc.): fondo oscuro, sin #007bff */
.main-sidebar .nav-sidebar > .nav-item:not(.has-treeview) > .nav-link.active,
.main-sidebar .nav-treeview > .nav-item > .nav-link.active,
.main-sidebar .nav-treeview > .nav-item > .nav-link.active:hover,
.main-sidebar .nav-treeview > .nav-item > .nav-link.active:focus {
    background-color: var(--sentinel-nav-active-bg) !important;
    color: var(--sentinel-nav-active-color) !important;
    box-shadow: none !important;
    font-weight: 600;
}

.main-sidebar.sidebar-light-primary .nav-sidebar.nav-legacy > .nav-item > .nav-link.active {
    border-color: transparent !important;
}

/* Marca (SENTINEL): sin borde gris + un poco más de alto (layout-navbar-fixed) */
.layout-navbar-fixed .wrapper .main-sidebar .brand-link:not([class*="navbar"]),
[class*="sidebar-light"] .brand-link,
.main-sidebar .brand-link {
    border-bottom: none !important;
    background-color: #222 !important;
    box-shadow: none !important;
    min-height: calc(3.5rem + 1px) !important;
    display: flex !important;
    align-items: center !important;
    padding-top: 0.95rem !important;
    padding-bottom: 0.95rem !important;
    box-sizing: border-box !important;
}

.layout-navbar-fixed.sidebar-mini.sidebar-collapse .wrapper .brand-link:not([class*="navbar"]) {
    min-height: unset !important;
    height: calc(3.5rem + 1px) !important;
    padding-top: 0.8125rem !important;
    padding-bottom: 0.8125rem !important;
    display: block !important;
}

a {
    color: var(--sentinel-blue);
}

a:hover,
a:focus {
    color: var(--sentinel-blue-hover);
}

.preloader {
    background-color: #222 !important;
}

.preloader img {
    background-color: var(--sentinel-black);
    border-radius: 50%;
    width: 72px !important;
    height: 72px !important;
    padding: 14px;
}