:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --text: #e7ecf3;
  --muted: #8b9bb0;
  --accent: #3d8bfd;
  --user: #243044;
  --assistant: #1e2a3d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.top {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #2a3545;
}

.top h1 {
  margin: 0 0 0.35rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.meta {
  margin: 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.meta .warn {
  color: #f0b429;
}

.chat {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 5rem);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding-bottom: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.bubble {
  max-width: 95%;
  padding: 0.65rem 0.9rem;
  border-radius: 0.75rem;
  line-height: 1.45;
  white-space: pre-wrap;
}

.bubble--user {
  align-self: flex-end;
  background: var(--user);
  border: 1px solid #334155;
}

.bubble--assistant {
  align-self: flex-start;
  background: var(--assistant);
  border: 1px solid #2d3a4f;
}

.sources {
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0.5rem 0.75rem;
  background: #141c28;
  border-radius: 0.5rem;
  border: 1px solid #2a3545;
}

.sources ul {
  margin: 0.35rem 0 0;
  padding-left: 1.1rem;
}

.src-name {
  color: var(--accent);
}

.composer {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
  padding-top: 0.5rem;
  border-top: 1px solid #2a3545;
}

.composer textarea {
  flex: 1;
  resize: vertical;
  min-height: 2.5rem;
  padding: 0.5rem 0.65rem;
  border-radius: 0.5rem;
  border: 1px solid #334155;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}

.composer button {
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.composer button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.error {
  color: #f87171;
  font-size: 0.875rem;
  margin: 0.5rem 0 0;
}