:root {
  color-scheme: dark;
  font-family: ui-sans-serif, system-ui, sans-serif;
}

body {
  margin: 0;
  background: #10131a;
  color: #e8edf5;
}

main {
  width: min(760px, calc(100% - 32px));
  margin: 40px auto;
}

#messages {
  min-height: 360px;
  padding: 20px;
  border: 1px solid #2d3544;
  border-radius: 12px;
  background: #171c26;
}

.message {
  margin: 0 0 16px;
  white-space: pre-wrap;
}

.user {
  color: #9ac7ff;
}

.assistant {
  color: #e8edf5;
}

.meta {
  color: #93a0b5;
  font-size: 0.85rem;
}

form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 10px;
  margin-top: 16px;
}

label {
  grid-column: 1 / -1;
  font-weight: 600;
}

input {
  min-width: 0;
  padding: 12px;
  color: inherit;
  background: #171c26;
  border: 1px solid #3d4960;
  border-radius: 8px;
}

button {
  padding: 0 18px;
  color: #07121f;
  background: #7dc4ff;
  border: 0;
  border-radius: 8px;
  font-weight: 700;
}

button:disabled {
  opacity: 0.5;
}