body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #0f172a;
  color: #e5e7eb;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.chat {
  width: 420px;
  height: 600px;
  background: #020617;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,.6);
}

.header {
  padding: 16px;
  font-weight: bold;
  text-align: center;
  background: #020617;
  border-bottom: 1px solid #1e293b;
}

.messages {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
}

.msg {
  max-width: 80%;
  padding: 10px 14px;
  margin-bottom: 10px;
  border-radius: 12px;
  line-height: 1.4;
}

.user {
  background: #38bdf8;
  color: #020617;
  margin-left: auto;
}

.ai {
  background: #1e293b;
}

.input {
  display: flex;
  border-top: 1px solid #1e293b;
}

.input input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 14px;
  color: #e5e7eb;
  outline: none;
}

.input button {
  background: #38bdf8;
  border: none;
  padding: 0 18px;
  font-weight: bold;
  cursor: pointer;
}