body {
      font-family: Arial, sans-serif;
      background: #f3f4f6;
      margin: 0;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }

    .container {
      width: 60%;
      height: 70%;
      background: #fff;
      border-radius: 12px;
      box-shadow: 0 4px 15px rgba(0,0,0,0.1);
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }

    header {
      background: #3b82f6;
      color: white;
      padding: 12px;
      text-align: center;
      font-weight: bold;
    }

    #connection_status {
      font-size: 0.85rem;
      color: #d1fae5;
    }

    .forms {
      padding: 12px;
      border-bottom: 1px solid #e5e7eb;
    }

    .forms p {
      margin: 6px 0;
      font-weight: 600;
      color: #374151;
    }

    .forms form {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 8px;
    }

    input[type="text"],
    input[type="password"] {
      flex: 1;
      padding: 8px;
      border: 1px solid #d1d5db;
      border-radius: 6px;
    }

    input[type="submit"] {
      background: #3b82f6;
      color: white;
      padding: 8px 14px;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      font-weight: 600;
    }

    input[type="submit"]:hover {
      background: #2563eb;
    }

    #message-box {
      flex: 1;
      padding: 12px;
      overflow-y: auto;
      background: #f9fafb;
    }

    .message {
      max-width: max-content;
      padding: 10px;
      margin: 6px 0;
      border-radius: 10px;
      word-wrap: break-word;
      position: relative;
    }

    .message.user {
      background: #3b82f6;
      color: white;
      margin-left: auto;
      text-align: right;
    }

    .message.other {
      background: #e5e7eb;
      color: #111827;
      margin-right: auto;
      text-align: left;
    }

    .sender {
      font-weight: bold;
      font-size: 0.8rem;
      margin-bottom: 4px;
      display: block;
    }

    .time {
      font-size: 0.7rem;
      opacity: 0.7;
      margin-top: 4px;
      display: block;
    }

    .chat-input {
      display: flex;
      padding: 10px;
      border-top: 1px solid #e5e7eb;
      background: white;
    }

    .chat-input input[type="text"] {
      flex: 1;
      padding: 10px;
      border: 1px solid #d1d5db;
      border-radius: 8px;
    }

    .chat-input input[type="submit"] {
      margin-left: 8px;
      background: #3b82f6;
      border-radius: 8px;
    }