* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all 0.3s ease;
  }
  
  body {
    font-family: Arial, sans-serif;
    background-color: #fff;
    color: #222;
  }
  
  .dark {
    background-color: #1e1e1e;
    color: #f5f5f5;
  }
  
  .dark header {
    background-color: #333;
  }
  
  .dark .left-column,
  .dark .right-column {
    background-color: #2d2d2d;
    color: #f5f5f5;
  }
  
  .dark .center-column {
    background-color: #252525;
    color: #f5f5f5;
  }
  
  .dark .trello,
  .dark .planning,
  .dark .user-info {
    background: #333;
    color: #f5f5f5;
  }
  
  .dark .dropdown-content,
  .dark .nested-content {
    background-color: #333;
    color: #f5f5f5;
    border: 1px solid #555;
  }
  
  .dark .dropdown-content a,
  .dark .nested-content a {
    color: #f5f5f5;
  }
  
  .dark .dropdown-content a:hover,
  .dark .nested-content a:hover {
    background-color: #444;
  }
  
  #toggle-darkmode {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 0.5rem;
    border-radius: 50%;
    border: none;
    background-color: #444;
    color: white;
    cursor: pointer;
  }
  
  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: #222;
    color: white;
    position: relative;
  }
  
  .nav-link a, .nav-link span {
    color: white;
    text-decoration: none;
    margin: 0 10px;
    cursor: pointer;
  }
  
  /* Menu Contacter */
  .nav-link.dropdown {
    position: relative;
    display: inline-block;
  }
  
  .dropdown-content {
    display: none;
    position: absolute;
    background-color: white;
    color: #333;
    min-width: 200px;
    padding: 0.5rem;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
    border-radius: 5px;
    z-index: 10;
    top: 100%;
    left: 0;
    margin-top: 5px;
    border: 1px solid #ddd;
  }
  
  .dropdown-content.show {
    display: block;
  }
  
  .dropdown-content a {
    color: #333;
    padding: 8px 12px;
    display: block;
    text-decoration: none;
  }
  
  .dropdown-content a:hover {
    background-color: #f5f5f5;
  }
  
  /* Sous-menus */
  .nested-dropdown {
    position: relative;
  }
  
  .nested-content {
    display: none;
    position: absolute;
    left: 100%;
    top: 0;
    background-color: white;
    min-width: 160px;
    border-radius: 5px;
    z-index: 20;
    margin-left: 5px;
    border: 1px solid #ddd;
  }
  
  .nested-content.show {
    display: block;
  }
  
  .expandable::after {
    content: " ▼";
    font-size: 0.8em;
  }
  
  .notification {
    position: relative;
    cursor: pointer;
  }
  
  .notification .notification-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    background-color: white;
    color: black;
    min-width: 200px;
    padding: 0.5rem;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
    z-index: 10;
  }
  
  .notification.active .notification-dropdown {
    display: block;
  }
  
  .profile-menu {
    position: relative;
    cursor: pointer;
  }
  
  .profile-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    background-color: white;
    color: black;
    min-width: 160px;
    padding: 0.5rem;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
    z-index: 10;
  }
  
  .profile-menu.active .profile-dropdown {
    display: block;
  }
  
  main {
    display: flex;
    flex-direction: row;
    height: calc(100vh - 60px);
  }
  
  .left-column {
    width: 20%;
    padding: 1rem;
    background-color: #f0f0f0;
  }
  
  .center-column {
    width: 60%;
    padding: 2rem;
    background-color: #ffffff;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .right-column {
    width: 20%;
    padding: 1rem;
    background-color: #f0f0f0;
  }
  
  .main-title {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2.5rem;
  }
  
  .trello {
    background: #ddd;
    border-radius: 10px;
    padding: 2rem;
    width: 100%;
    height: 100%;
  }
  
  .planning, .user-info {
    background: #ddd;
    border-radius: 10px;
    padding: 1rem;
    height: 100%;
  }
  
  /* Modal de contact */
  .modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
  }
  
  .modal-content {
    background-color: #fefefe;
    margin: 10% auto;
    padding: 20px;
    border-radius: 10px;
    width: 80%;
    max-width: 500px;
  }
  
  .dark .modal-content {
    background-color: #333;
    color: white;
  }
  
  .close-modal {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
  }
  
  .close-modal:hover {
    color: black;
  }
  
  .dark .close-modal:hover {
    color: white;
  }
  
  .modal-content textarea {
    width: 100%;
    height: 150px;
    margin: 15px 0;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ddd;
    resize: none;
  }
  
  .dark .modal-content textarea {
    background-color: #444;
    color: white;
    border-color: #555;
  }
  
  .modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
  }
  
  .btn-cancel {
    background-color: #ff4444 !important;
    padding: 8px 20px;
  }
  
  .btn-send {
    background-color: #4CAF50 !important;
    padding: 8px 20px;
  }
  
  @media screen and (max-width: 768px) {
    main {
      flex-direction: column;
    }
    .left-column, .center-column, .right-column {
      width: 100%;
      height: auto;
    }
    
    header {
      flex-wrap: wrap;
    }
    
    .dropdown-content,
    .nested-content {
      position: relative;
      width: 100%;
      left: 0;
      margin-left: 0;
    }
    
    .modal-content {
      margin: 20% auto;
      width: 90%;
    }
  }

  /* Supprimer tous les styles .learn-more et les remplacer par : */

.button-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    width: 100%;
  }
  
  .simple-btn {
    width: 100%;
    padding: 12px 0;
    border: none;
    border-radius: 6px;
    background-color: #4CAF50;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
    text-align: center;
    font-size: 1rem;
  }
  
  .simple-btn:hover {
    background-color: #45a049;
  }
  
  .dark .simple-btn {
    background-color: #282936;
  }
  
  .dark .simple-btn:hover {
    background-color: #1e1e2a;
  }
  
  /* Adapter la colonne droite */
  .right-column {
    width: 20%;
    padding: 1rem;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
  }
  
  .dark .right-column {
    background-color: #2d2d2d;
  }