:root {
    --primary: #1abc9c;
    --primary-hover: #16a085;
    --background: #121212;
    --surface: #1e1e1e;
    --text: #e0e0e0;
    --text-secondary: #b0b0b0;
    --user-message: #2a3f4d;
    --bot-message: #2d2d2d;
    --border: #333;
    --shadow: rgba(0, 0, 0, 0.5);
  }
  
  body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background);
    color: var(--text);
  }
  
  .container {
    display: flex;
    height: 100vh;
  }
  
  .sidebar {
    width: 250px;
    background-color: var(--surface);
    color: var(--text);
    padding: 20px;
    box-shadow: 2px 0 5px var(--shadow);
    border-right: 1px solid var(--border);
  }
  
  .sidebar h2 {
    margin-bottom: 30px;
    font-size: 1.5rem;
    color: var(--primary);
  }
  
  .mode-selector {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  .mode-btn {
    padding: 10px 15px;
    background-color: #2a2a2a;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
  }
  
  .mode-btn.active {
    background-color: var(--primary);
    color: #000;
    border-color: var(--primary);
  }
  
  .mode-btn:hover {
    background-color: #333;
  }
  
  .chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    background-color: var(--background);
  }
  
  .chat-box {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background-color: var(--surface);
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px var(--shadow);
    border: 1px solid var(--border);
  }
  
  .chat-form {
    display: flex;
    gap: 10px;
  }
  
  .chat-form input {
    flex: 1;
    padding: 12px 15px;
    background-color: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 5px;
    font-size: 1rem;
  }
  
  .chat-form input:focus {
    outline: 1px solid var(--primary);
  }
  
  .chat-form button {
    padding: 12px 20px;
    background-color: var(--primary);
    color: #000;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    font-weight: bold;
  }
  
  .chat-form button:hover {
    background-color: var(--primary-hover);
  }
  
  .message {
    margin-bottom: 15px;
    padding: 12px 16px;
    border-radius: 8px;
    max-width: 80%;
    line-height: 1.4;
  }
  
  .user-message {
    background-color: var(--user-message);
    margin-left: auto;
    border-bottom-right-radius: 0;
    border: 1px solid #2a4d66;
  }
  
  .bot-message {
    background-color: var(--bot-message);
    margin-right: auto;
    border-bottom-left-radius: 0;
    border: 1px solid #333;
  }
  
  .sources {
    margin-top: 10px;
    font-size: 0.8rem;
    color: var(--text-secondary);
  }
  
  .sources a {
    color: var(--primary);
    text-decoration: none;
  }
  
  .sources a:hover {
    text-decoration: underline;
  }
  
  /* Modal styles */
  .modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.9);
  }
  
  .modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    background-color: var(--surface);
    border-radius: 8px;
    padding: 20px;
    border: 1px solid var(--border);
  }
  
  .close-btn {
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 24px;
    cursor: pointer;
    z-index: 1001;
    color: var(--text);
  }
  
  .close-btn:hover {
    color: var(--primary);
  }
  
  /* Scrollbar styling */
  ::-webkit-scrollbar {
    width: 8px;
  }
  
  ::-webkit-scrollbar-track {
    background: var(--surface);
  }
  
  ::-webkit-scrollbar-thumb {
    background: #444;
    border-radius: 4px;
  }
  
  ::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
  }