body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: #f8fafc;
  margin: 0;
  color: #0f172a;
}

.chat-container {
  max-width: 680px;
  margin: 40px auto;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.05);
}

#chatBox {
  height: 420px;
  overflow-y: auto;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 12px;
  background: #f8fafc;
}

.msg {
  padding: 10px 12px;
  margin: 8px 0;
  border-radius: 10px;
  line-height: 1.4;
}

.msg.user {
  background: #dbeafe;
  align-self: flex-end;
}

.msg.assistant {
  background: #e2e8f0;
}

.input-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

input#userInput {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  font-size: 14px;
}

button {
  padding: 10px 14px;
  border: none;
  background: #2563eb;
  color: white;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}