/* Eléments principaux de la page */

body{
    font-family: 'Trebuchet MS', Arial, sans-serif;
    color: #181818;
    background-color: white;
    position: relative;
    text-align: justify;
    margin: auto


}


body p {
    margin-left: 20px;
    margin-right: 20px;
    height: auto;
    font-size: 18px;
}

h1{
    text-align: center;
    font-weight: bold;
    background-color: #CCC;
    padding: 2%;
    opacity: 75%;
}

/* HEADER  */

header{
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

#titre_principal{
    display: flex;
    flex-direction: column;
}

header h2{
    margin-top: 3%;
    margin-left: 20%;
    font-weight: normal;
    letter-spacing: 0.2em; /*espacement des lettres*/
}



/*NAVIGATION*/
nav{
    width: 60%;
    margin: 0 auto;
    background-color: white;
    position: sticky;
    top: 0px;
}

nav input[type=checkbox]{
    display: none;
}
nav label{
    display: inline-block;
    width: 80%;
   margin-right: 0px;
    text-align: center;
}
nav ul{
    display: none;
    list-style-type: none;
}
nav input[type=checkbox]:checked + ul{
    display: flex;
    flex-flow : column wrap;
}
nav ul li{
    flex: 1 1 auto;
    text-align: center;
}
nav > div > ul > li > a{
    color: white;
}
nav a{
    display: block;
    text-decoration: none;
    color: black;
    padding: 10px 0px;
    font-size: 20px;
}


/* FOOTER */

footer{
    display: flex;
    padding: 15px;
    background-color: rgba(19, 18, 18, 0.87);
    width: auto;
    color: white;
    margin-top: 5%;
    height: auto;
    margin-bottom: 0px;
}

footer p, footer ul{
    font-size: 1.3em;
}
footer h4 {
    font-size: 20px;
}
.logo {
    margin-right: 50%;
}

footer h1{
    font-size: 1.1em;
}

.info_footer{
    grid-column: 1 / 3;
    margin-left: 5%;
}

.menu_footer{
    grid-column: 2 / 3;
    margin-left: 15%;
}
.contact_footer{
    grid-column: 3 / 3;
    margin-left: 20%;
}

.contact_footer img {
    width: 40px;
}

.info_footer img {
    width: 200px;
}

.logo_upec {
  width : 200px;
}

.golo img {
  width: 60px;
}

/*LIEN*/
/*Couleur lien*/
footer a:link {
    color: white;
}
footer a:visited{
    color: white;
}
/*enlever souligne lien*/
a:link{
    text-decoration:none;
}

h2 a:link {
    color: black;
}
h2 a:visited{
    color: black;
} 

/*DIVERS*/

/*les espaces*/
.espace_petit{
    margin-top: 5%;
}
.espace_grand{
    margin-top: 15%;
}
.espace_mini{
    margin-top: 2%;
}
.espace_moyen {
    margin-top: 8%;
}


/*centrer une image*/
.center_image{
    display: block;
    margin-left: auto;
    margin-right: auto;
}


/*syle de la barre*/
::-webkit-scrollbar {
    height: 6px;
    background-color: #F5F5F5;
}
::-webkit-scrollbar-thumb {
    background-color:orange; /*barre*/
    border-radius: 3px;
}

/*MEDIA QUERIES*/


@media screen and (max-width: 646px){
    body h1{
        font-size: 18px;
    }
    body p {
      font-size: 14px;
    }

    section h2 {
        font-size: 18px;
    }

    section p {
        font-size: 14px;
    }
    p {
        font-size: 13px;
    }

    footer p {
        font-size: x-small;
    }

    footer h4 {
        font-size: 12px;
    }

    .contact_footer img {
        width: 20px;
    }

    .info_footer img {
        width: 90px;
    }
    .info_footer{
        grid-column: 1 / 3;
        margin-left: 0px;
    }
    .menu_footer{
        grid-column: 2 / 3;
        margin-left: 3%;
    }
    .contact_footer{
        grid-column: 3 / 3;
        margin-left: 5%;
   }
   .logo_upec {
     width : 100px;
   }
   .golo img {
     width: 30px;
   }


}


@media screen and (max-height :819px ){
    .espace_petit{
        margin-top: 2%;
    }

    .espace_grand{
        margin-top: 10%;
    }

    .espace_mini{
        margin-top: 1%
    }

    .espace_moyen {
        margin-top: 5%;
    }
}


@media screen and (min-width: 980px){
   
    nav label, nav input{
        display: none;

    }
    nav input[type=checkbox]:checked + ul, nav ul{
        display: flex;
        flex-flow: row wrap;
    }
    nav ul li{
        position: relative;
        z-index: 1;
    }

    nav a{
        border-bottom: 1px solid transparent;
    }
    nav a:hover{
       color: orange;
        border-bottom: 1px solid gold;
        font-weight: bold;
    }

}