body {
    font-family: 'Arial', sans-serif; 
    margin: 0;
    padding: 0;
    width: 100vw;
    overflow-x: hidden;
    font-family: "Inter", sans-serif;
}
/* En-tête */
header {
    background: white; 
    padding: 10px 20px;
    text-align: center;
    height: 5vh;
    display: flex;
    align-items: center; 
}
header h1{
    width: 25vw;
    margin-left: 5vw;
    color: black;
}

nav ul {
    margin-left: 40vw;
    width: 25vw;
    display: flex;
    justify-content: space-between; 
    list-style: none; 
    padding: 0;
}
nav ul li {
    display: inline; 
    margin-right: 10px;
}
nav ul li a {
    text-decoration: none; 
    color: black;
}
.hamburger-menu {
    display: none; 
    font-size: 2rem;
    background: none;
    border: none;
    cursor: pointer;
}
/* sections principales */
main {
    padding: 0px;
    margin-top: 0px; 
}
/* Premiere partie */
#partie1 h1{
    text-align: center;
    color: #3A6E8C;
    font-size: 4em;
}
#firsttext{
    width:40vw;
    margin-left: 30vw;
    text-align: center;
    font-size: 1.2em;
    font-size: bold;
}
.contact-form {
    background: #fff;
    padding: 20px; 
    margin: 20px auto; 
    width: 90%; 
    max-width: 600px; 
    font-family: "Inter", sans-serif;
}
.contact-form label {
    display: block; 
    margin: 0.5em 0 0.2em;
    color: #3A6E8C; 
    font-size: 1.3em;
    font-family: "Inter", sans-serif;
}
.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form input[type="tel"],
.contact-form textarea {
    width: 100%; 
    padding: 0.5em; 
    margin-bottom: 1em; 
    border-radius: 4px; 
    border: 1px solid grey;
}
.contact-form textarea {
    height: 100px; 
    resize: vertical; 
}
.contact-form button[type="submit"] {
    padding: 10px 15px; 
    background-color: #3A6E8C; 
    border: none; 
    border-radius: 4px; 
    color: white; 
    font-size: 1em; 
    cursor: pointer; 
    display: block; 
    border: 1px solid #3A6E8C;
    width: 100%;
}
.contact-form button[type="submit"]:hover {
    background-color: #333; 
}
/* Pied de page */
footer {
    background: #3A6E8C;
    color: #ffffff;
    text-align: center;
    height: 20vh;
    width: 100%;
    display: flex;
    justify-content: space-around; 
    align-items: center;
}
footer div{
    width: 20vw;
    height: 18vh;
}
.btn3 {
    display: inline-block; 
    padding: 10px 20px;
    margin: 2px; 
    background-color: white; 
    color: #3A6E8C; 
    text-align: center; 
    text-decoration: none; 
    font-weight: bold; 
    border-radius: 5px; 
    transition: background-color 0.3s, transform 0.2s; 
}
@media (max-width: 1068px) {
    header h1{
        font-size: 1em;
        width: 75%;
        text-align: left;
    }
    nav ul {
        display: none; 
        flex-direction: column;
        width: 100%; 
        background: white;
        transition: all 0.3s;
        position: absolute;
        top: 5vh;
        left: 0;
        margin: 0;
        padding: 0;
    }
    nav ul li {
        text-align: center; 
        padding: 10px 0; 
        width: 100%;
    }
    nav ul li a {
        display: block; 
    }
    .hamburger-menu {
        display: block; 
    }
    #partie1 h1{
        font-size: 2em;
    }
    #firsttext{
        width:70vw;
        margin-left: 15vw;
        font-size: 1em;
    }
    .contact-form {
        padding: 0px; 
        margin: 0px auto; 
        width: 80%; 
        height: 1400px;
        margin-top: 5vh;
    }
    .contact-form input[type="text"],
    .contact-form input[type="email"],
    .contact-form input[type="tel"],
    .contact-form textarea {
        font-size: 1.5em;
    }
    footer {
        height: 25vh;
        flex-wrap: wrap;
        margin: 0;
        padding: 0;
    }
    footer div{
        width: 45vw;
        height: 9vh;
        font-size: 0.6em;
    }
    .btn3 {
        font-size: 0.7em;
    }
}