:root {
  --bg: #0f172a;
  --panel: #111827;
  --border: #334155;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --accent: #22c55e;
  --accent-2: #16a34a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: linear-gradient(180deg, #020617, #0f172a);
  color: var(--text);
}
button, input, textarea {
  font: inherit;
}
button {
  background: var(--accent);
  color: #052e16;
  border: 0;
  border-radius: 12px;
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-weight: 700;
}
button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
input, textarea {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #020617;
  color: var(--text);
  padding: 0.85rem 1rem;
}
textarea { resize: vertical; }
.shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1rem;
  padding: 1rem;
}
.card {
  background: rgba(17, 24, 39, 0.94);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.25);
}
.sidebar {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.chat {
  padding: 1rem;
  min-height: calc(100vh - 2rem);
}
.chatHeader {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.fill {
  height: 100%;
  display: flex;
  flex-direction: column;
}
.messages {
  flex: 1;
  overflow: auto;
  padding: 1rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.msg {
  max-width: 75%;
  padding: 0.85rem 1rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  white-space: pre-wrap;
}
.msg.me {
  align-self: flex-end;
  background: #052e16;
  border-color: #166534;
}
.msg.them {
  align-self: flex-start;
  background: #0b1220;
}
.msgMeta {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.75rem;
}
.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.stack { display: flex; flex-direction: column; gap: 0.75rem; }
.hidden { display: none !important; }
.center { height: 100%; display: grid; place-items: center; text-align: center; }
.muted { color: var(--muted); }
.tiny { font-size: 0.8rem; }
.tabs { display: flex; gap: 0.5rem; }
.tabs button { flex: 1; }
.tabs button.active { outline: 2px solid #86efac; }
.userRow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #0b1220;
}
.inset {
  padding: 0.75rem;
  background: #0b1220;
}
pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}
@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }
  .chat { min-height: 65vh; }
  .composer { grid-template-columns: 1fr; }
}