body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #e3f2fd, #bbdefb);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.chat-container {
  background: white;
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  width: 400px;
  max-height: 90vh;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

h1 {
  text-align: center;
  margin-bottom: 10px;
  color: #0288d1;
}

.username-display {
  text-align: center;
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 10px;
}

.chat-box {
  flex-grow: 1;
  background: #f5f5f5;
  border-radius: 10px;
  padding: 10px;
  overflow-y: auto;
  margin-bottom: 10px;
  max-height: 300px;
  border: 1px solid #ccc;
}

.chat-message {
  background-color: #e1f5fe;
  margin: 5px 0;
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 0.9rem;
  word-wrap: break-word;
}

#chat-input {
  border: 1px solid #ccc;
  border-radius: 8px;
  padding: 10px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.3s;
}

#chat-input:focus {
  border-color: #0288d1;
}