*{/*selector universal*/
    margin: 0;
    padding: 0;
}

*, *::before, *::after{
    box-sizing: border-box;
}

body{
    font-family: Arial, Helvetica, sans-serif; /*fuente de letra*/
    background-color: #f1f5f9; /*fondo de la pagina*/
    color: #333333;
    line-height: 1.6;

    display: grid;
    grid-template-columns: 200px 1fr 250px;
    grid-template-rows: auto 1fr auto;

    grid-template-areas: 
        "encabezado encabezado encabezado"
        "menu contenido avisos"
        "pie pie pie";
    min-height: 100vh;
}

/*Encabezado*/
header{
    grid-area: encabezado; 
    background-color: #0f172a;
    color: #ffffff;
    padding: 15px 20px; /*espacio de arriba y abajo*/

    display:flex;
    justify-content: space-between;
    align-items: center;
    
}

header span{
 color: #2f9bc9;
}
header p{
    font-size: 18px;
}


/*menu*/
.menu-nav{
    grid-area: menu;
    padding: 20px 0;
    font-size: 19px;
    background-color: #1e3a5f;
}

.menu-nav ul{
    list-style: none;
}

.menu-nav a{
    display: block;
    color: #ffffff;
    text-decoration: none;
    padding: 12px;
    border-bottom: 1px solid #466080;
}

.menu-nav a:focus-within{
    background-color: #0284c7;
}

.menu-nav a.destacado{
     border: 5px solid #3498db;
    position: relative;
}

/*contenido*/
main{
    grid-area: contenido;
    min-width: 0;
    padding: 20px;
}

main section{
    margin-bottom: 24px;
    padding: 20px 0;
}

.tarjetas-resumen{
    display: flex;
    justify-content: space-between;
    gap: 15px;
}

.tarjeta{
    background-color: #ffffff;
    padding: 20px;
    border-radius: 10px;
    flex: 1; /*reparte el espacio entre las tarjetas*/
}

.tarjeta h3{
    font-size: 18px;
    font-weight: bold;
    color:#27538c
}

.tarjeta p{
    font-size: 28px; /*tamano fuente*/
    font-weight: bold; /*en negritas*/
    color: #0284c7;
}

/*Tabla */
.contenedor-principal{
    background-color: #ffffff;
    padding: 25px;

}

.contenedor-principal h2{
    color:#446ea4;
    font-weight: 800;
    font-size: 22px;
    margin-bottom: 20px; /*espacio entre el h2 con la tabla*/
}

table{
    width: 100%;
    border-collapse: collapse;
    background-color: #ffffff;
}

thead{
    background-color: #cae8f4;
}
.tabla-encabezado{
    color:#2a5c9d;
    font-weight: 800;
    font-size: 15px;
    text-align: left;
    padding: 10px;
}

td{
    color:#1a607e;
    padding: 12px;
    font-size: 17px;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

.tabla-estado{
    background-color: #bbf7d0;
    color:#166534;
    padding: 3px 6px;
    border-radius: 4px;
    font-weight: bold;
}

.tabla-estado.destacado{
     background-color: #fef08a;
    color:#854d0e;
    padding: 3px 6px;
    border-radius: 4px;
    font-weight: bold;
}

tbody tr:nth-child(even){
    background-color: #eaf0f6;
}

/*Aside*/
aside{
    grid-area: avisos;
    font-size: 17px;
    background-color: #ffffff;
    padding: 20px;
    border-left: 1px solid #e2e8f0;
}

aside h2{
    margin-bottom: 12px;
    font-size: 19px;
    font-weight:800;
    color:#2a5c9d;
    
}

aside ul{
    padding-left: 20px;
}

aside li{
    margin-bottom: 10px;
    color:#27538c;
    
}

aside span{
    font-weight: 800;
}
/*pie de pagina*/
footer{
    grid-area: pie;
    background-color: #0f172a;
    color:#afcde0;
    text-align: center;
    padding: 12px 20px ;
    font-size: 20px;
}

/*diseno responsive*/
@media(max-width: 768px){
    body{
        grid-template-columns: 1fr;
        grid-template-rows: auto auto 1fr;
        grid-template-areas:
            "encabezado"
            "menu"
            "contenido"
            "avisos"
            "pie";
    }
    header{
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .tarjetas-resumen{
        flex-direction: column;
    }
    aside{
        border-left: none;
        border-top: 1px solid #e2e8f0;
    }
    .contenedor-tabla{
        overflow-x: auto;
    }

}