:root {
  --bg: #0f1117;
  --panel: #171a22;
  --border: #2a3140;
  --text: #e8ecf4;
  --muted: #8b95a8;
  --accent: #6ea8fe;
  --ok: #3dd68c;
  --warn: #f5a524;
  --err: #f87171;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}
header {
  padding: 1.25rem 1.5rem 0.5rem;
  border-bottom: 1px solid var(--border);
}
h1 { margin: 0; font-size: 1.35rem; }
.sub { margin: 0.25rem 0 0.75rem; color: var(--muted); font-size: 0.9rem; }
.header-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
}
.metrics-bar, .chat-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.85rem;
  font-size: 0.78rem;
  color: var(--muted);
}
.metrics-bar.hidden, .chat-stats.hidden { display: none; }
.metric-chip {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
}
.metric-chip strong { color: var(--ok); font-weight: 600; }
.pill {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.pill.idle { background: #2a3140; color: var(--muted); }
.pill.ready { background: #163d2f; color: var(--ok); }
.pill.loading, .pill.downloading { background: #3d3316; color: var(--warn); }
.pill.error { background: #3d1a1a; color: var(--err); }
nav {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--border);
}
.tab {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.4rem 0.9rem;
  border-radius: 8px;
  cursor: pointer;
}
.tab.active { background: var(--panel); border-color: var(--accent); color: var(--accent); }
main { max-width: 900px; margin: 0 auto; padding: 1rem 1.5rem 2rem; }
.panel { display: none; }
.panel.active { display: block; }
.messages {
  min-height: 320px;
  max-height: 55vh;
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
}
.msg { margin-bottom: 1rem; white-space: pre-wrap; line-height: 1.45; }
.msg-metrics {
  margin-top: 0.35rem;
  font-size: 0.75rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
}
.msg-metrics span strong { color: var(--ok); }
.msg.user { color: var(--accent); }
.msg.assistant { color: var(--text); }
.msg.system { color: var(--muted); font-size: 0.9rem; }
.chat-form textarea, .settings-form input, .settings-form select {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  margin-top: 0.35rem;
}
.settings-form label { display: block; margin-bottom: 1rem; font-size: 0.9rem; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.row { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; }
button {
  background: var(--accent);
  color: #0b1020;
  border: none;
  border-radius: 8px;
  padding: 0.55rem 1rem;
  font-weight: 600;
  cursor: pointer;
}
button.secondary { background: var(--panel); color: var(--text); border: 1px solid var(--border); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.hint { color: var(--muted); font-size: 0.85rem; }
.status-log, .code {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  overflow-x: auto;
  font-size: 0.82rem;
  color: var(--muted);
}
.check { display: flex; align-items: center; gap: 0.4rem; font-size: 0.9rem; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }