:root {
            --color-primary: #2C3E50;
            --color-secondary: #34495E;
            --color-accent: #1A2530;
            --color-light: #ECF0F1;
            --color-dark: #2C3E50;
            --color-bg: #F8F9FA;
            --color-border: #DDE4E9;
            --sidebar-width: 280px;
            --sidebar-collapsed-width: 80px;
            --color-active: #3498DB;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Roboto', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: var(--color-bg);
            color: var(--color-dark);
            overflow-x: hidden;
        }
        
        /* Layout Principal */
        .main-container {
            display: flex;
            min-height: 100vh;
        }
        
        /* Sidebar base */
        .sidebar {
            width: var(--sidebar-width);
            background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
            color: white;
            transition: all 0.3s ease;
            position: fixed;
            height: 100vh;
            z-index: 1000;
            box-shadow: 3px 0 10px rgba(0, 0, 0, 0.1);
            display: flex;
            flex-direction: column; /* divide el sidebar en header, menú y footer */
        }
        
        .sidebar-header {
            padding: 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo-icon {
            font-size: 24px;
            margin-right: 10px;
            color: white;
        }
        
        .logo-text {
            font-weight: 500;
            font-size: 18px;
            color: white;
        }
        
        .toggle-btn {
            background: none;
            border: none;
            color: white;
            font-size: 20px;
            cursor: pointer;
            display: none;
        }
        
        .sidebar-menu {
            flex: 1; /* ocupa todo el espacio disponible entre header y footer */
            overflow-y: auto; /* el scroll se aplica aquí */
            padding: 20px 0;
            scrollbar-width: thin;
            scrollbar-color: rgba(255,255,255,0.3) rgba(0,0,0,0.2);
        }

        .sidebar-menu::-webkit-scrollbar {
            width: 8px;
        }

        .sidebar-menu::-webkit-scrollbar-thumb {
            background-color: rgba(255,255,255,0.3);
            border-radius: 4px;
        }

        .sidebar-menu::-webkit-scrollbar-thumb:hover {
            background-color: rgba(255,255,255,0.5);
        }
        
        .menu-title {
            padding: 10px 20px;
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 1px;
            opacity: 0.7;
            margin-top: 15px;
        }
        
        .menu-item {
            display: flex;
            align-items: center;
            padding: 12px 20px;
            text-decoration: none;
            color: rgba(255, 255, 255, 0.8);
            transition: all 0.2s;
            position: relative;
        }
        
        .menu-item:hover {
            background-color: rgba(255, 255, 255, 0.1);
            color: white;
        }
        
        .menu-item.active {
            background-color: rgba(52, 152, 219, 0.2);
            color: white;
        }
        
        .menu-item.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            height: 100%;
            width: 4px;
            background-color: var(--color-active);
        }
        
        .menu-icon {
            font-size: 18px;
            margin-right: 15px;
            width: 24px;
            text-align: center;
        }
        
        .menu-text {
            flex: 1;
        }
        
        .menu-badge {
            background-color: rgba(255, 255, 255, 0.2);
            padding: 2px 8px;
            border-radius: 10px;
            font-size: 12px;
        }
        
        .submenu {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        
        .submenu.open {
            max-height: 500px;
        }
        
        .submenu-item {
            padding: 10px 20px 10px 60px;
            display: block;
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: all 0.2s;
            font-size: 14px;
        }
        
        .submenu-item:hover, .submenu-item.active {
            color: white;
            background-color: rgba(255, 255, 255, 0.05);
        }
        
.sidebar-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background: linear-gradient(180deg, var(--color-secondary), var(--color-primary));
    padding: 20px;
    flex-shrink: 0; /* evita que se contraiga */
    position: sticky;
    bottom: 0;
}
        
        .user-info {
            display: flex;
            align-items: center;
        }
        
        .user-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--color-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 10px;
            color: var(--color-primary);
            font-weight: bold;
        }
        
        .user-details {
            flex: 1;
        }
        
        .user-name {
            font-weight: 500;
            font-size: 14px;
        }
        
        .user-role {
            font-size: 12px;
            opacity: 0.7;
        }
        
        /* Contenido Principal */
        .main-content {
            flex: 1;
            margin-left: var(--sidebar-width);
            transition: margin-left 0.3s ease;
        }
        
        .topbar {
            background-color: white;
            padding: 15px 30px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .search-bar {
            display: flex;
            align-items: center;
            background-color: var(--color-bg);
            border-radius: 6px;
            padding: 8px 15px;
            width: 300px;
        }
        
        .search-bar input {
            border: none;
            background: none;
            outline: none;
            flex: 1;
            margin-left: 10px;
        }
        
        .topbar-actions {
            display: flex;
            align-items: center;
        }
        
        .action-item {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-left: 15px;
            color: var(--color-dark);
            background-color: var(--color-bg);
            position: relative;
            text-decoration: none;
            transition: all 0.2s;
        }
        
        .action-item:hover {
            background-color: var(--color-primary);
            color: white;
        }
        
        .badge {
            position: absolute;
            top: -5px;
            right: -5px;
            background-color: #E74C3C;
            color: white;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 10px;
        }
        
        .content {
            padding: 30px;
        }
        
        .page-title {
            font-weight: 500;
            margin-bottom: 20px;
            color: var(--color-primary);
        }
        
        .card {
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            margin-bottom: 25px;
            border: none;
        }
        
        .card-header {
            background-color: white;
            border-bottom: 1px solid var(--color-border);
            padding: 15px 20px;
            font-weight: 500;
            color: var(--color-primary);
        }
        
        .card-body {
            padding: 20px;
        }
        
        /* Sidebar colapsado */
        .sidebar-collapsed .sidebar {
            width: var(--sidebar-collapsed-width);
        }
        
        .sidebar-collapsed .main-content {
            margin-left: var(--sidebar-collapsed-width);
        }
        
        .sidebar-collapsed .logo-text,
        .sidebar-collapsed .menu-text,
        .sidebar-collapsed .menu-badge,
        .sidebar-collapsed .menu-title,
        .sidebar-collapsed .user-details,
        .sidebar-collapsed .submenu {
            display: none;
        }
        
        .sidebar-collapsed .sidebar-header {
            justify-content: center;
        }
        
        .sidebar-collapsed .menu-item {
            justify-content: center;
            padding: 15px;
        }
        
        .sidebar-collapsed .menu-icon {
            margin-right: 0;
        }
        
        /* Indicador de página actual para sidebar colapsado */
        .sidebar-collapsed .menu-item.active:after {
            content: "";
            position: absolute;
            right: 5px;
            top: 50%;
            transform: translateY(-50%);
            width: 8px;
            height: 8px;
            background-color: var(--color-active);
            border-radius: 50%;
        }
        
        /* Responsive */
        @media (max-width: 992px) {
            .sidebar {
                width: var(--sidebar-collapsed-width);
                transform: translateX(-100%);
            }
            
            .main-content {
                margin-left: 0;
            }
            
            .sidebar-open .sidebar {
                transform: translateX(0);
                width: var(--sidebar-width);
            }
            
            .sidebar-open .logo-text,
            .sidebar-open .menu-text,
            .sidebar-open .menu-badge,
            .sidebar-open .menu-title,
            .sidebar-open .user-details,
            .sidebar-open .submenu {
                display: block;
            }
            
            .sidebar-open .sidebar-header {
                justify-content: space-between;
            }
            
            .sidebar-open .menu-item {
                justify-content: flex-start;
                padding: 12px 20px;
            }
            
            .sidebar-open .menu-icon {
                margin-right: 15px;
            }
            
            .toggle-btn {
                display: block;
            }
            
            .overlay {
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background-color: rgba(0, 0, 0, 0.5);
                z-index: 999;
                display: none;
            }
            
            .sidebar-open .overlay {
                display: block;
            }
            
            .search-bar {
                width: 200px;
            }
        }
        
        @media (max-width: 576px) {
            .search-bar {
                display: none;
            }
            
            .topbar {
                padding: 15px;
            }
            
            .content {
                padding: 15px;
            }
        }
        
        /* Contenido de ejemplo */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }
        
        .stat-card {
            background: white;
            border-radius: 8px;
            padding: 20px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            text-align: center;
        }
        
        .stat-value {
            font-size: 2rem;
            font-weight: 600;
            color: var(--color-primary);
            margin-bottom: 5px;
        }
        
        .stat-label {
            color: #666;
            font-size: 0.9rem;
        }


        /* === Scroll interno para sidebar === */
.sidebar {
    overflow-y: auto; /* Permite scroll vertical */
    scrollbar-width: thin; /* Scroll más discreto en Firefox */
    scrollbar-color: rgba(255,255,255,0.3) rgba(0,0,0,0.2); /* Color del scroll */
}

/* Para navegadores basados en WebKit (Chrome, Edge, Safari) */
.sidebar::-webkit-scrollbar {
    width: 8px;
}

.sidebar::-webkit-scrollbar-thumb {
    background-color: rgba(255,255,255,0.3);
    border-radius: 4px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background-color: rgba(255,255,255,0.5);
}