* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, #0f172a 0%, #111827 100%);
  color: #f9fafb;
}
.app-shell {
  max-width: 980px;
  margin: 0 auto;
  padding: 18px;
  display: grid;
  gap: 16px;
}
.panel {
  background: rgba(17, 24, 39, 0.95);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  padding: 20px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.25);
}
.brand {
  display: inline-block;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(59,130,246,0.18);
  color: #93c5fd;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 10px;
}
h1,h2,h3{margin-top:0}
.sub,.helper,.muted{color:#9ca3af}
.small{font-size:12px}
.notice-box {
  margin-top: 14px;
  padding: 14px;
  background: rgba(245,158,11,0.12);
  border: 1px solid rgba(245,158,11,0.25);
  border-radius: 14px;
}
.notice-box p { margin-bottom: 0; }
label {
  display:block; font-size:13px; margin-bottom:6px; color:#d1d5db; font-weight:700;
}
input {
  width:100%; padding:13px 14px; border-radius:12px; border:1px solid #374151;
  background:#111827; color:#f9fafb; margin-bottom:12px; font-size:15px;
}
.btn { border:none; border-radius:12px; padding:12px 16px; font-size:15px; font-weight:700; cursor:pointer; }
.btn.primary{background:#2563eb;color:#fff}
.btn.secondary{background:#374151;color:#fff}
.btn.danger{background:#dc2626;color:#fff}
.room-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.badge{display:inline-flex;align-items:center;justify-content:center;padding:8px 12px;border-radius:999px;background:rgba(34,197,94,0.18);color:#86efac;font-size:12px;font-weight:700}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px}
.stat-card{background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.06);border-radius:16px;padding:14px}
.stat-title{display:block;font-size:12px;color:#9ca3af;margin-bottom:8px}
.controls{margin-top:16px;display:flex;gap:10px;flex-wrap:wrap}
.section-block{margin-top:18px}
.participant-list,.chat-list,.log-list{
  min-height:120px; max-height:280px; overflow:auto; border-radius:14px;
  border:1px solid rgba(255,255,255,0.08); background:rgba(255,255,255,0.03); padding:12px;
}
.participant-item,.chat-item,.log-item{padding:10px 12px;border-radius:12px;background:rgba(255,255,255,0.04);margin-bottom:8px}
.participant-item strong,.chat-item strong{display:block;margin-bottom:4px}
.chat-input-row{display:grid;grid-template-columns:1fr 90px;gap:8px;margin-top:10px}
.hidden{display:none!important}
code{background:#111827;padding:2px 6px;border-radius:6px}
@media (max-width:700px){
  .app-shell{padding:12px}
  .stats-grid{grid-template-columns:1fr}
  .chat-input-row{grid-template-columns:1fr}
  .room-top{flex-direction:column;align-items:flex-start}
}