body {
    font-family: Arial, sans-serif;
    background: #f5f5f5; /* açık beyaz zemin */
    color: #222;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }
  
  .chat-container, .form-container {
    background: #ffffff; /* beyaz kart */
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
  }
  
  input, button {
    margin-top: 10px;
    padding: 10px;
    border-radius: 6px;
    border: 1px solid #ccc;
    font-size: 14px;
  }
  
  button {
    background: linear-gradient(135deg, #4CAF50, #2E7D32);
    color: white;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s ease;
  }
  
  button:hover {
    background: linear-gradient(135deg, #66BB6A, #388E3C);
  }
  
  .chat-box {
    flex: 1;
    height: 300px;
    overflow-y: auto;
    background: #e8f5e9; /* yeşilimsi açık arka plan */
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  /* Mesaj kutusu stili */
  .message {
    max-width: 80%;
    padding: 10px 14px;
    border-radius: 18px;
    word-wrap: break-word;
    font-size: 14px;
  }
  
  /* Gönderen kullanıcı (sağ) */
  .message.sent {
    align-self: flex-end;
    background-color: #4CAF50;
    color: #fff;
    border-bottom-right-radius: 4px;
  }
  
  /* Alınan mesaj (sol) */
  .message.received {
    align-self: flex-start;
    background-color: #dcedc8;
    color: #2e7d32;
    border-bottom-left-radius: 4px;
  }