body {
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: #0d0d12;
  color: #e8e8f0;
  font-family: system-ui, sans-serif;
}
#messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}
.msg { margin-bottom: 12px; }
.msg.me { color: #8ab4f8; }
.msg.ai { color: #e8e8f0; }
#bar {
  display: flex;
  padding: 12px;
  gap: 8px;
  border-top: 1px solid #222;
}
#input {
  flex: 1;
  padding: 10px 14px;
  border-radius: 20px;
  border: none;
  background: #1b1b24;
  color: #eee;
  font-size: 16px;
  outline: none;
}
#send {
  padding: 10px 18px;
  border-radius: 20px;
  border: none;
  background: #e8e8f0;
  color: #0d0d12;
  font-size: 16px;
  cursor: pointer;
}