:root {
  --bg: #0f1419;
  --card: #1a222c;
  --line: #2a3544;
  --text: #e8eef5;
  --muted: #8b9bb0;
  --accent: #3d9cf0;
  --danger: #e05a5a;
  --ok: #3ecf8e;
  --warn: #e0a84a;
  font-family: "Segoe UI", system-ui, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(1200px 600px at 20% -10%, #1a3048, var(--bg));
  color: var(--text);
  min-height: 100vh;
}
#app { max-width: 720px; margin: 0 auto; padding: 20px 16px 48px; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
h1 { font-size: 1.25rem; margin: 0; letter-spacing: -0.02em; }
h2 { font-size: 0.95rem; margin: 0 0 12px; color: var(--muted); font-weight: 600; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 12px;
}
.row { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.grow { flex: 1; min-width: 0; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 0.8rem; color: var(--muted); }
input[type="text"], input:not([type]), select, #chatInput, #name, #room {
  width: 100%;
  background: #0d1218;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.95rem;
}
input[type="range"] { width: 100%; accent-color: var(--accent); }
button {
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-weight: 600;
  cursor: pointer;
  background: var(--line);
  color: var(--text);
}
button:disabled { opacity: 0.4; cursor: not-allowed; }
button.primary { background: var(--accent); color: #041018; }
button.ghost { background: transparent; border: 1px solid var(--line); }
button.toggle {
  width: 44px; height: 44px; flex: none; font-size: 1.2rem;
  background: #243040;
}
button.toggle.on { background: var(--danger); }
.pill {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 999px;
  background: #243040;
}
.pill.ok { background: #1a3d30; color: var(--ok); }
.pill.off { color: var(--muted); }
.val { width: 36px; text-align: right; font-variant-numeric: tabular-nums; color: var(--muted); }
.meter {
  height: 6px;
  background: #0d1218;
  border-radius: 4px;
  overflow: hidden;
  margin: 0 0 14px;
}
.meter i {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--ok), var(--warn), var(--danger));
  transition: width 60ms linear;
}
.hint, .muted, footer { color: var(--muted); font-size: 0.8rem; }
#peers { list-style: none; margin: 0; padding: 0; }
#peers li {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 0; border-bottom: 1px solid var(--line);
}
#peers li:last-child { border-bottom: none; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); flex: none; }
.dot.me { background: var(--accent); }
#chatLog {
  height: 140px; overflow: auto; background: #0d1218;
  border-radius: 8px; padding: 8px; margin-bottom: 8px;
  font-size: 0.85rem; line-height: 1.4;
}
#chatLog .meta { color: var(--muted); margin-right: 6px; }
.join-card { display: grid; grid-template-columns: 1fr 1fr auto auto; gap: 10px; align-items: end; }
@media (max-width: 640px) {
  .join-card { grid-template-columns: 1fr 1fr; }
  .join-card button { grid-column: span 1; }
}