body {
        margin: 0;
        font-family: 'Segoe UI', sans-serif;
        background: #f9f9f9;
    }

    header {
        /*background-image*/
        position: relative;
        z-index: 1;
        background-color: #000;
        color: white;
        margin: 1em 2em 0em 2em;
        padding: 1em 1em 1em 1em;
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
    }
    .frontpic {
        border-radius: 10px;
        max-height: 280px;
        width: 70%;
        pointer-events: none;
        z-index: 0;
        position: relative;
        margin: auto;
    }

    .front-title {
        position: absolute;
        bottom: 0;
        left: 0;
        width: 100%;
        z-index: 10000;
        background-color: rgba(0, 0, 0, 0.7);
        color: white;
        text-align: center;
        padding: 10px 0;
        font-size: 18px;
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    header:hover .front-title {
        opacity: 0.7;
    }
    header h1 {
        font-size: 1.5em;
        margin: 0;
    }

    /*Hamburger menu*/
    .menu-toggle {
        width: 30px;
        height: 25px;
        display: flex;
        z-index: 1001;
        position: absolute;
        flex-direction: column;
        justify-content: space-between;
        cursor: pointer;
    }

    .menu-toggle span {
        height: 4px;
        background: #f8f8f8;
        border-radius: 4px;
        transition: all 0.3s ease;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .side-menu {
        position: fixed;
        top: 0;
        left: -300px;
        width: 300px;
        height: 100%;
        background: #111;
        color: #fff;
        padding: 20px;
        box-sizing: border-box;
        transition: left 0.3s ease;
        z-index: 1000;
        overflow-y: auto;
        max-height: auto;
    }

    .side-menu.open {
        left: 0;
    }

    .side-menu h2 {
        margin-top: 0;
    }

    .side-menu ul {
        list-style: none;
        padding: 0;
    }

    .side-menu li {
        margin: 20px 0;
        font-size: 1.1em;
        cursor: pointer;
        color: #ffffff;
    }

    .side-menu li i {
        margin-right: 10px;
    }

    .side-menu li:hover {
        color: #0af;
    }
    .side-menu a {
        text-decoration: none;
    }
    .side-menu a:hover {
        color: #0af;
    }
    .side-menu a:visited {
        color: #ffffff;
        text-decoration: none;
    }

    .overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0,0,0,0.3);
        display: none;
        z-index: 999;
    }

    .overlay.active {
        display: block;
    }

    main {
        padding: 2em;
        z-index: 1;
    }

    .content-section_1 {
        background: #4A2C2A;
        padding: 2em 2em 2em 2em;
        margin-bottom: 20px;
        border-radius: 8px;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }
    .content-section_1 h2 {
        text-align: center;
        font-size: 2.5em;
        color: #f8f8f8;
        font-family: 'Yellowtail';
    }

    .content-section_2 {
        background: #fbfbfb;
        padding: 40px;
        margin-bottom: 20px;
        border-radius: 8px;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }

    .text-section {
        font-size: 1.1em;
        text-align: justify;
    }    

    .menu-droite {
        position: fixed;
        right: 0;
        top: 50%;
        transform: translateY(-50%);
        z-index: 1002;
    }

    /* small transparent menu buton */
    .menu-droite > .label {
        background: rgba(00, 00, 00, 1);  /* semi-transparent background: rgba(27, 36, 49, 0.7); */
        color: #fff;                        /* text not transparent */
        border: none;
        border-radius: 15px 0 0 15px;
        cursor: pointer;
        padding: 20px 10px;
        font-size: 1.1em;
        font-weight: bold;
        writing-mode: vertical-rl;
        text-orientation: mixed;
        transition: all 0.3s ease;
        box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }

    /* menu hidden */
    .menu-droite ul {
        list-style: none;
        margin: 0;
        padding: 20px;
        position: absolute;
        right: 10%;
        top: 50%;
        transform: translateY(-50%) translateX(20px);
        width: 260px;
        background: #1b2431;
        border-radius: 15px 0 0 15px;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }

    /* show menu hover */
    .menu-droite:hover ul,
    .menu-droite:focus-within ul {
        opacity: 1;
        visibility: visible;
        transform: translateY(-50%) translateX(0);
}

    /* links within menus */
    .menu-droite ul a {
        display: block;
        text-decoration: none;
        color: #fff;
        font-size: 1.1em;
        margin: 6px 0;
        transition: color 0.2s, transform 0.2s;
}

    .menu-droite ul a:hover {
        color: #00aced;
        transform: translateX(5px);
}

.thumbnail {
    width: 200px;
    cursor: pointer;
    border-radius: 10px;
    margin: 5px;
    transition: transform 0.2s;
}
.thumbnail:hover {
    transform: scale(1.05);
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    z-index: 10000;
    inset: 0;
    background: rgba(0,0,0,0.8);
    justify-content: center;
    align-items: center;
}
.lightbox img {
    max-width: 90%;
    max-height: 90%;
    border-radius: 10px;
}

.image-container {
    position: relative;
    display: inline-block;
}

.hover-text {
    position: absolute;
    bottom: 8px;
    left: 0;
    right: 0;
    text-align: center;
    color: white;
    background: rgba(0, 0, 0, 0.6);
    padding: 6px;
    border-radius: 0 0 8px 8px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 14px;
}

.image-container:hover .hover-text {
    opacity: 1;
}

    footer {
        background: black;
        height:350px;
        color: white;
        text-align: center;
        padding: 1em;
    }

    .foot-section {
        display: flex;
        justify-content: center;
        gap: 20px;
        background-color: #000;
        text-decoration: none;
        font-size: 1.1em;
        padding: 20px;
        margin: 20px;
        -moz-box-shadow: 0px 0px 8px #000;
        -webkit-box-shadow: 0px 0px 8px #000;
        box-shadow: 0px 0px 8px #000;
    }

    div.foot-section a {padding: 0px 30px; text-align: right; text-decoration: none;}
    div.foot-section a:link {color:#ffffff;}
    div.foot-section a:visited {color:#ffffff;}
    div.foot-section a:hover {color:#696969;}

    a.valeurs {
        position:relative;
        text-align:center;
    }
    a.valeurs:hover {
        background: none;
        z-index: 50;
    }
    a.valeurs span {
        display: none;
    }
    a.valeurs:hover span {
        display: block;
        position: absolute;
        bottom: 37px;
        right: 10px;
        font-family:arial, verdana, sans-serif;
        text-align:justify;
        font-size:12px;
        font-weight:normal;
        width:380px;
        background:#fff;
        padding: 5px 20px 20px 20px;
        border: 10px solid #ddd;
        -webkit-box-shadow: 0px 0px 20px #000;
        -moz-box-shadow: 0px 0px 20px #000;
        box-shadow: 0px 0px 20px #000;
        /*--Coins arrondis en CSS3--*/
        -webkit-border-radius: 10px;
        -moz-border-radius: 10px;
        border-radius: 10px;}

    a.infobox {
        position:relative;
        text-align:center;
    }
    a.infobox:hover {
        background: none;
        z-index: 50;
    }
    a.infobox span {
        display: none;
    }
    a.infobox:hover span {
        display: block;
        position: absolute;
        bottom: 37px;
        right: 10px;
        font-family:arial, verdana, sans-serif;
        color: black;
        text-align:justify;
        font-size:0.7em;
        font-weight:normal;
        width:380px;
        background:#fff;
        padding: 5px 20px 20px 20px;
        border: 10px solid #ddd;
        -webkit-box-shadow: 0px 0px 20px #000;
        -moz-box-shadow: 0px 0px 20px #000;
        box-shadow: 0px 0px 20px #000;
        /*--Coins arrondis en CSS3--*/
        -webkit-border-radius: 10px;
        -moz-border-radius: 10px;
        border-radius: 10px;
    }
    /* Responsive */
    @media (max-width: 768px) {
        .menu-toggle {
            display: block;
            z-index: 10000;
            width: 25px;
            height: 20px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            cursor: pointer;
        }
        .content-section_1 h2 {
            font-size: 1.8em;
        }

        .nav-links {
            display: none;
            flex-direction: column;
            background-color: #d3d3d3;
            text-align: center;
        }

        .nav-links.active {
            display: flex;
        }

        .author-section, .publication-section {
            flex-wrap: wrap;
            /*flex-direction: column;*/
            text-align: center;
        }
        .content-section_2 {
            padding: 10px;
        }

        .slides img {
            max-width: 100%;
        }
        .foot-section {
            flex-direction: column;
            align-items: center;
        }
        .frontpic {
            width: 100%;
        }
        header {
            margin: 0;
        }
        .thumbnail {
            width: 100px;
        }
    }