:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #18202a;
  --muted: #5e6978;
  --line: #d9dee7;
  --accent: #0f766e;
  --accent-dark: #0b514c;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.45 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.shell {
  width: min(1100px, calc(100vw - 32px));
  margin: 24px auto;
}
.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 14px;
}
h1, h2, p { margin: 0; }
h1 { font-size: 24px; }
h2 { font-size: 15px; margin-bottom: 8px; }
#status { color: var(--muted); margin-top: 4px; }
button {
  border: 0;
  background: var(--accent);
  color: white;
  padding: 10px 14px;
  border-radius: 6px;
  cursor: pointer;
}
button:hover { background: var(--accent-dark); }
.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}
.settings {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}
.metrics div, .transcript, .events {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.metrics div { padding: 12px; }
.metrics span { display: block; color: var(--muted); font-size: 12px; }
.metrics strong { display: block; font-size: 20px; margin-top: 4px; }
.transcript {
  min-height: 360px;
  padding: 14px;
  overflow: auto;
}
.message {
  max-width: 75%;
  padding: 10px 12px;
  border-radius: 8px;
  margin: 0 0 10px;
  white-space: pre-wrap;
}
.user { margin-left: auto; background: #dbeafe; }
.assistant { background: #ecfdf5; }
.composer {
  display: grid;
  grid-template-columns: 1fr minmax(180px, auto) auto auto auto;
  gap: 10px;
  margin: 12px 0;
}
input, select {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px;
  font: inherit;
  background: white;
}
.events { padding: 12px; }
ol { margin: 0; padding-left: 22px; color: var(--muted); }
li { margin: 4px 0; }
@media (max-width: 720px) {
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .settings { grid-template-columns: 1fr; }
  .message { max-width: 100%; }
  .composer { grid-template-columns: 1fr; }
}