* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
}
.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
}
.bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
h1 { margin: 0; font-size: 22px; }
h2 { margin-top: 0; font-size: 17px; }
#meta { margin: 6px 0 0; color: #94a3b8; font-size: 13px; }
.badge {
  background: #334155;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
}
.panel {
  margin-top: 14px;
  padding: 14px;
  background: #111827;
  border: 1px solid #1f2937;
  border-radius: 8px;
}
.ptt {
  width: 100%;
  padding: 16px;
  border: 0;
  border-radius: 8px;
  background: #6b7280;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
}
.ptt:disabled {
  opacity: .6;
}
.ptt.talking {
  background: #16a34a;
}
.ptt.listening {
  background: #dc2626;
}
.hint {
  margin: 10px 0 0;
  color: #94a3b8;
  font-size: 13px;
}
#participants {
  list-style: none;
  margin: 0;
  padding: 0;
}
#participants li {
  padding: 8px 10px;
  border-bottom: 1px solid #1f2937;
  font-size: 14px;
}
#participants li:last-child { border-bottom: 0; }