body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #ffffff;
    min-height: 100vh;
     overflow: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    padding: 40px 20px 30px;
    color: #000;
    font-size: 1.8em;
    font-weight: 300;
    letter-spacing: -0.5px;
}

/* Menu Horizontal Minimaliste */
#menu_pas_a_pas {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 0;
    border-bottom: 1px solid #e0e0e0;
    padding: 0 20px;
    background: #fff;
}

#menu_pas_a_pas ul {
    display: flex;
    justify-content: flex-start;
    gap: 5px;
    /* border-bottom: 1px solid #e0e0e0; */
    padding: 0 20px;
    background: #fff;
    flex-direction: row;
    flex-wrap: wrap;
}

#menu_pas_a_pas li {
    flex: 0 1 auto;
}

#menu_pas_a_pas a {
    display: block;
    padding: 5px ;
    text-decoration: none;
    color: #666;
    font-weight: 400;
    font-size: 0.95em;
    letter-spacing: 0.3px;
    transition: all 0.2s ease;
    position: relative;
    border-bottom: 2px solid transparent;
}

#menu_pas_a_pas a::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 0;
    height: 2px;
    background: #000;
    transition: width 0.3s ease;
}

#menu_pas_a_pas a:hover {
    color: #000;
}

#menu_pas_a_pas a:hover::after {
    width: 100%;
}

#menu_pas_a_pas li.clic a {
    color: #000;
    font-weight: 500;
}

#menu_pas_a_pas li.clic a::after {
    width: 100%;
}

/* Zone de contenu */
.content-area {
    padding: 40px 20px;
}

iframe {
    width: 100%;
    height: 650px;
    border: 1px solid #e0e0e0;
    background: #fafafa;
    margin-top:40px;
}

/* Responsive */
@media (max-width: 968px) {
    #menu_pas_a_pas {
        flex-wrap: wrap;
    }

    #menu_pas_a_pas a {
        font-size: 0.9em;
    }
}

@media (max-width: 640px) {
    h1 {
        font-size: 1.4em;
        padding: 30px 20px 20px;
    }

    #menu_pas_a_pas {
        flex-direction: column;
        border-bottom: none;
        border-right: 1px solid #e0e0e0;
    }

    #menu_pas_a_pas a {
        border-right: 2px solid transparent;
    }

    #menu_pas_a_pas a::after {
        bottom: 0;
        left: auto;
        right: -1px;
        width: 2px;
        height: 0;
    }

    #menu_pas_a_pas a:hover::after,
    #menu_pas_a_pas li.clic a::after {
        width: 2px;
        height: 100%;
    }

    iframe {
        height: 500px;
    }
}