* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f4f7f6;
    color: #333;
}

/* Layout Principal usando Flexbox */
.layout-principal {
    display: flex;
    min-height: 100vh;
}

/* Menú Lateral */
.panel-lateral {
    width: 250px;
    background-color: #2c3e50;
    color: #ecf0f1;
    transition: all 0.3s ease;
    overflow-y: auto;
}

.panel-lateral.colapsado {
    width: 60px;
}

/* Panel Central (Resto de la pantalla) */
.panel-central {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.cabecera-top {
    background-color: #fff;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.btn-menu {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: #2c3e50;
}

.area-trabajo {
    padding: 20px;
}

/* Cuadrícula de Accesos Rápidos */
.grid-accesos {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.tarjeta-acceso {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    text-align: center;
    text-decoration: none;
    color: #333;
    transition: transform 0.2s, box-shadow 0.2s;
    border-top: 4px solid #3498db;
}

.tarjeta-acceso:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
}

/* Estilos internos del menú */
.nav-menu list {
    list-style: none;
}
.nav-menu li a {
    display: block;
    padding: 15px 20px;
    color: #ecf0f1;
    text-decoration: none;
    border-bottom: 1px solid #34495e;
}
.nav-menu li a:hover {
    background-color: #34495e;
}