body {
  font-family: Arial, sans-serif;
  background: #f0f5f9;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}
.chat-container {
  width: 90%;
  max-width: 500px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.chat-log {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
}
.message {
  margin-bottom: 0.8rem;
}
.message.user { text-align: right; }
.message.bot { text-align: left; }
.chat-form {
  display: flex;
  border-top: 1px solid #ddd;
}
.chat-form input {
  flex: 1;
  border: none;
  padding: 0.8rem;
  font-size: 1rem;
}
.chat-form button {
  background: #0077b6;
  color: #fff;
  border: none;
  padding: 0 1rem;
  cursor: pointer;
}