body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
  }
  
  /* Login Styles */
  #login-container {
    width: 100%;
    max-width: 400px;
    margin: 100px auto;
    text-align: center;
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
  }
  
  input {
    width: 90%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
  }
  
  button {
    padding: 10px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  button:hover {
    background: #0056b3;
  }
  
  /* Chat Container */
  #chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
  }
  
  header {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    background: #007bff;
    color: white;
  }
  
  #date-list {
    display: flex;
    overflow-x: auto;
    padding: 10px;
    background: #f5f5f5;
  }
  
  .date-item {
    padding: 8px;
    margin-right: 5px;
    background: white;
    border-radius: 5px;
    cursor: pointer;
    box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.1);
  }
  
  .date-item:hover {
    background: #e0e0e0;
  }
  
  /* Chat Box */
  #chat-box {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    background: white;
  }
  
  .message {
    padding: 10px;
    border-radius: 5px;
    margin: 5px;
    width: fit-content;
    max-width: 80%;
  }
  
  .sent {
    background: #007bff;
    color: white;
    align-self: flex-end;
  }
  
  .received {
    background: #f1f1f1;
  }
  
  /* Chat Input */
  #chat-input {
    display: flex;
    padding: 10px;
    background: white;
    border-top: 1px solid #ccc;
  }
  
  #message {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
  }
  
  #file-upload {
    display: none;
  }