@import url('https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&display=swap');
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Open Sans", sans-serif;
}
body {
    height: 100vh; 
}

#groupe1{
    background: url(Baan_thip.jpg);
    background-size: cover;
/*   background-position: center; */
    background-position: 30% 50%;
}


header {
    display: flex;
    flex-direction: row-reverse;
    justify-content: space-between;
    align-items: center;
    padding: 20px 5%;
    box-shadow: rgba(0,0,0,0.1) 0 0 10px;
    background-color: #442c60;
}

.logo {
    font-size: 45px;
}
ul {
    list-style: none;
    display: flex;
}

ul li {
    margin: 0 10px;
}
a {
    text-decoration: none;
    color:#f5bf5b;
    font-weight: bold;
    padding: 10px 20px;
    transition: 0.5s;
    border-radius: 6px;
}
a:hover {
    background-color: #000;
    color: #fff;
}

.flex-container {
    display: flex;
    flex-direction: row; /* Par défaut, en colonne */
}

@media screen and (max-width: 800px) {
    body {
        position: relative;
    }

    header {
        background-color: #4b0081;
    }
    
    #groupe1{
        background: url(LOGO_SMARTPHONE.jpg);
        background-size: cover;
        background-position: center;
    }

    .flex-container {
        display: flex;
        flex-direction: column; /* Par défaut, en colonne */
     }

     ul {
        flex-direction: column;
        position: absolute;
        top: 0;
        left: -1500px;
        height: 100vh;
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
        background-color: rgba(255, 255, 255, 0.8);
        transition: 0.5s;
        backdrop-filter: blur(10px);
        
    }
    ul li {
        margin: 20px 0;
    }
    ul li a{

        text-transform: uppercase;

    }
    ul li a:hover{
        color: #fff;

    }
    .button{
        z-index: 100;
        width: 50px;
        height: 50px;
        position: relative;
        display: flex;
        justify-content: center;
        align-items: center;
        cursor: pointer;
    }
    .button::after{
        content: "";
        position: absolute;
        width: 35px;
        height: 2px;
        background-color: #000;
        transform: translateY(-10px);
        box-shadow: 0 10px 0 #000 ;
        transition: 0.5s;
    }
    .button.active::after{
        transform: rotate(45deg);
        box-shadow: 0 0 0 #000 ;
    }
    .button::before{
        content: "";
        position: absolute;
        width: 35px;
        height: 2px;
        background-color: #000;
        transform: translateY(10px);
        transition: 0.5s;
    }
    .button.active::before{
        transform: rotate(-45deg);
    }
    ul.active {
        left :0 ;
    }
   
    img {
        width :  50vh;
        height : 50vh;
    }
}