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

    body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: #333;
      background: #f5f5f5;
      background-image: url('https://static.vecteezy.com/ti/vecteur-libre/p1/830014-futuriste-banniere-fond-avec-filaire-terrain-gratuit-vectoriel.jpg');
      background-attachment:fixed;
      background-size: cover;
    }

    /* Barre de progression */
    #progress-bar {
      position: fixed;
      top: 0;
      left: 0;
      height: 4px;
      background: linear-gradient(90deg, #6a11cb, #2575fc);
      width: 0%;
      z-index: 2000;
      transition: width 0.2s ease-out;
    }

    header {
      background: linear-gradient(135deg, #6a11cb, #2575fc);
      color: white;
      padding: 1.2rem 1rem;
    }

    header .header-content {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      max-width: 1200px;
      margin: 0 auto;
    }

    header .header-text h1 {
      font-size: 2.2rem;
      margin-bottom: 0.3rem;
    }

    header .header-text p {
      font-size: 1.1rem;
      opacity: 0.9;
      font-style: italic;
    }

    /* Drapeaux langue empilés */
    .language-flags {
      margin-top: 0.1rem;
      display: flex;
      flex-direction: column;
      align-items: flex-end;
    }

    .language-flags a {
      margin: 0.2rem 0;
      display: inline-block;
    }

    .language-flags img {
      width: 30px;
      height: auto;
      border: 1px solid #fff;
      border-radius: 3px;
      transition: transform 0.2s;
    }

    .language-flags img:hover {
      transform: scale(1.1);
    }

    /* Barre de navigation */
    nav {
      display: flex;
      justify-content: center;
      align-items: center;
      background: #222;
      padding: 0.5rem 1rem;
      position: relative;
    }

    nav ul {
      list-style: none;
      display: flex;
      gap: 1rem;
    }

    nav a {
      color: white;
      text-decoration: none;
      padding: 0.5rem 1rem;
      position: relative;
      transition: color 0.3s;
    }

    nav a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 3px;
      background: #2575fc;
      transition: width 0.3s;
    }

    nav a:hover::after {
      width: 100%;
    }

    /* Menu burger */
    .menu-toggle {
      display: none;
      font-size: 1.5rem;
      color: white;
      cursor: pointer;
    }

    @media (max-width: 768px) {
      nav ul {
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #222;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
      }

      nav ul.open {
        max-height: 500px;
      }

      .menu-toggle {
        display: block;
        position: absolute;
        right: 1rem;
      }
    }

    /* Section Accueil */
    main {
      padding: 2rem 1rem;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    section#accueil {
      background: #fff;
      border: 2px solid #000;
      padding: 2rem;
      border-radius: 15px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
      max-width: 800px;
      width: 100%;
      transition: box-shadow 0.3s ease, transform 0.3s ease;
    }

    
    section#accueil:hover {
      box-shadow: 0 12px 30px rgba(0,0,0,0.45);
      transform: translateY(-4px);
    }

    section#accueil h2,
    section#accueil p {
      opacity: 0;
      transform: translateY(20px);
      animation: fadeInUp 1s forwards;
    }

    section#accueil p {
      animation-delay: 1.1s;
    }

    section#accueil ul {
      padding: 0;
      margin-top: 1rem;
      list-style-position: inside;
    }

    section#accueil li {
      opacity: 0;
      transform: translateY(20px);
      animation: fadeInUp 0.8s forwards;
    }

    /* Cascade : chaque li apparaît avec un petit décalage */
    section#accueil li:nth-child(1) {
      animation-delay: 1.7s;
    }
    section#accueil li:nth-child(2) {
      animation-delay: 1.9s;
    }
    section#accueil li:nth-child(3) {
      animation-delay: 2.1s;
    }
    section#accueil li:nth-child(4) {
      animation-delay: 2.3s;
    }
    section#accueil li:nth-child(5) {
      animation-delay: 2.5s;
    }
      

    @keyframes fadeInUp {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    section h2 {
      margin-bottom: 1rem;
      color: #222;
      font-size: 1.8rem;
      text-align: center;
    }

    section p {
      font-size: 1.1rem;
      text-align: center;
    }

    /* Footer */
    footer {
      text-align: center; /* centré */
      padding: 1.5rem;
      background: #222; /* fond noir */
      color: white;
      margin-top: 2rem;
    }

    footer .last-modified {
      font-style: italic;
      margin-left: 0.5rem;
      font-size: 0.85rem; /* texte plus petit */
    }

    /* Autre section */    

.autre-section {
      background: #fff;
      border: 2px solid #000;
      padding: 2rem;
      border-radius: 15px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
      max-width: 800px;
      width: 100%;
      transition: box-shadow 0.3s ease, transform 0.3s ease;
    }

.autre-section:hover {
      box-shadow: 0 12px 30px rgba(0,0,0,0.45);
      transform: translateY(-4px);
    }