body {
  margin: 0;
  font-family: Arial;
  background: #0b1220;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: white;
}

.app {
  width: 420px;
  height: 650px;
  background: #111a2e;
  border-radius: 15px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.header {
  padding: 12px;
  background: #1e293b;
  text-align: center;
  font-weight: bold;
  color: #38bdf8;
}

#chat {
  flex: 1;
  padding: 10px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.msg {
  padding: 10px;
  border-radius: 10px;
  max-width: 80%;
  white-space: pre-wrap;
}

.user {
  background: #2563eb;
  align-self: flex-end;
}

.ai {
  background: #334155;
  align-self: flex-start;
}

.input-area {
  display: flex;
  padding: 10px;
  background: #1e293b;
  gap: 8px;
}

input {
  flex: 1;
  padding: 10px;
  border: none;
  border-radius: 10px;
  outline: none;
  background: #0b1220;
  color: white;
}

button {
  padding: 10px 14px;
  border: none;
  border-radius: 10px;
  background: #22c55e;
}