/* RESET GENERAL */
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { background: #f4f7f6; display: flex; height: 100vh; overflow: hidden; }

/* CONTENEDOR PRINCIPAL */
#main-container { display: flex; width: 100%; height: 100%; }

/* BARRA LATERAL (NAV) */
nav { 
    width: 260px; 
    background: #2c3e50; 
    color: white; 
    height: 100%; 
    transition: all 0.3s;
    flex-shrink: 0;
}

nav ul { list-style: none; padding: 20px 0; }
nav ul li a { 
    display: block; 
    padding: 15px 25px; 
    color: #bdc3c7; 
    text-decoration: none; 
    font-size: 14px;
    border-left: 4px solid transparent;
}

nav ul li a:hover { 
    background: #34495e; 
    color: white; 
    border-left: 4px solid #3498db; 
}

/* ÁREA DE CONTENIDO (DERECHA) */
#container { 
    flex-grow: 1; 
    overflow-y: auto; 
    padding: 20px; 
    background: #f4f7f6; 
}

/* HEADER (TOP BAR DENTRO DEL CONTENIDO) */
header { 
    background: white; 
    padding: 15px 30px; 
    margin: -20px -20px 20px -20px; 
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
}

/* WIDGETS DEL DASHBOARD */
.dashboard_widgets { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-top: 20px; }
.card { background: white; padding: 20px; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); text-align: center; }
.card i { font-size: 40px; color: #3498db; margin-bottom: 10px; }