body {

  
      padding-right: 17px;
      overflow-y: scroll;
      font-family: 'Segoe UI', sans-serif;
      background-color: #f0f0f5;
      margin: 0;
      padding: 0;
      transition: color 0.3s, background-color 0.3s;
      }

    nav {
        background-color: #1a252f;
        padding: 15px 20px;
        display: flex;
        justify-content: center;
        gap: 30px;
        box-shadow: 0 2px 4px rgba(0,0,0,0.2);
        position: sticky;
        top: 0;
        z-index: 1000;
      }
  
      nav a {
        color: #ffffff;
        text-decoration: none;
        font-weight: bold;
        transition: color 0.3s;
      }
  
      nav a:hover {
        color: #ffd700;
      }

      header {
        background: linear-gradient(to bottom, #2c3e50, #1a252f); /* dégradé du header vers la nav */
        color: white;
        padding: 20px 20px;
        text-align: center;
        transition: color 0.3s;
      }

    h1 {
      margin: 0;
    }

    main {
      max-width: 900px;
      margin: 40px auto;
      background-color: white;
      padding: 30px;
      border-radius: 10px;
      box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
      transition: color 0.3s, background-color 0.3s;
    }

    section {
      margin-bottom: 40px;
    }

    h2 {
      color: #2c3e50;
      border-bottom: 2px solid #ddd;
      padding-bottom: 5px;
    }

    p {
      line-height: 1.6;
      color: #333;
    }

    footer {
      text-align: center;
      padding: 20px;
      background-color: #ecf0f1;
      color: #777;
      transition: color 0.3s, background-color 0.3s;
    }

    .fade-in {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 1s ease-out, transform 1s ease-out;
    }

    .fade-in.visible {
      opacity: 1;
      transform: none;
    }

    .ban {
      position: relative;
      padding-left: 20px;
    }

    .ban::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 5px;
      background-color: #2c3e50;
    }

    .bann {
      position: relative;
      padding-left: 20px;
    }

    .bann::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 5px;
      background-color: #2c3e5082;
    }

    button {
      background-color: #2c3e50;
      color: #ffffff;
      border: none;
      padding: 10px 20px;
      border-radius: 5px;
      font-size: 16px;
      cursor: pointer;
      transition: background-color 0.3s, transform 0.2s;
      text-align: center;
      margin: 20px auto;
      display: block;
    }

    button:hover {
      background-color: #1a252f;
      transform: scale(1.05);
    }

    button:active {
      background-color: #34495e;
    }