* {
    margin: 0;
    padding: 0;
    box-sizing: border-box; 
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #EEF4F8;
    color: #123b5d;
}

.site-header {
    display: flex;
    justify-content: center;
    align-self: center;
    padding: 25px 20px;
    background-color: #ffffff;
    border-bottom: 5px solid #f4b400;
}

.logo {
    width: 80%;
    max-width: 270px;
    height: auto;
}

.  min-height: 68vh;
    background: linear-gradient(rgba(0, 50, 90, 0.58),rgba(0, 50, 90, 0.58)),url("images/banniere-ais.jpg");
    background-size: cover;
    background-position: center;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 40px 20px;hero {
  
}

.hero-overlay {
    max-width: 1000px;
    color: #ffffff;
}

.hero {
    min-height: 65vh;
    background: linear-gradient(
        135deg,
        #6f91aa,
        #dceaf3
    );

    display: flex;
    justify-content: center;
    align-items: center;

    text-align: center;
    padding: 60px 20px;

    border-bottom: 5px solid #f4b400;
}

.hero h1 {
    .hero h1 {
    font-size: 3rem;
    color: #123b5d;
    margin-bottom: 15px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.18);
}

.hero h1::after {
    content:"";
    display: block;
    width: 100px;
    height: 5px;
    background-color: #f4b400;
    margin: 18px auto;
    border-radius: 5px;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 40px;
    line-height: 1.6;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.45);
}

.main-menu {
 .main-menu {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 25px;
    flex-wrap: wrap;
    margin-top: 35px;
}

.main-menu a {
    display: block;
    width: 300px;
}

.main-menu img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 14px;
    transition: transform 0.25s ease,
                box-shadow 0.25s ease;
}

.main-menu img:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.22);
}

footer {
    background-color: #123b5d;
    color:#ffffff;
    text-align: center;
    padding: 22px 15px;
    font-size: 0.9rem;
    border-top: 5px solid #f4b400;
}

@media (max-width: 700px) {

    .site-header {
        padding: 18px;
    }

    .logo {
        max-width: 220px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.05rem;
    }

    .main-menu {
        flex-direction: column;
    }

    .main-menu a {
        width: 85%;
        max-width: 320px;
    }
}