:root {
  color-scheme: light;
  font-family: system-ui, sans-serif;
  line-height: 1.6;
}

body {
  margin: 0;
  background: #f5f7fa;
  color: #1f2937;
}

main {
  width: min(100% - 2rem, 48rem);
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

#chat-log {
  display: grid;
  gap: 1rem;
  margin: 2rem 0;
}

.message {
  padding: 1rem;
  border-radius: 0.75rem;
  background: #fff;
  border: 1px solid #dbe2ea;
}

.message-user {
  background: #e8f1ff;
}

.message-assistant {
  background: #fff;
}

label,
textarea,
select,
button {
  display: block;
}

label {
  margin-top: 1rem;
  font-weight: 700;
}

textarea,
select {
  box-sizing: border-box;
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.7rem;
  font: inherit;
}

button {
  margin-top: 1rem;
  padding: 0.7rem 1.2rem;
  font: inherit;
  cursor: pointer;
}

button:disabled {
  cursor: wait;
  opacity: 0.6;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}