:root {
  color-scheme: light;
  --white: #fff;
  --transparent: transparent;
  --upn-yellow: #fdba30;
  --black: #000;
  --muted: #6c757d;
  --text: #212529;
  --primary: #007bff;
  --border: #dee2e6;
  --danger: #dc3545;
  --success: #28a745;
  --dark: #343a40;
  --background: #f8f9fa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background: var(--background);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app-shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 52px 0 64px; }
.hero { display: flex; align-items: end; justify-content: space-between; gap: 28px; margin-bottom: 28px; }
.upn-logo { display: block; width: 174px; height: auto; margin: 0 0 18px; }
.eyebrow, .room-mode { margin: 0 0 8px; color: var(--dark); font-size: .72rem; font-weight: 800; letter-spacing: .11em; }
h1, h2, p { margin-top: 0; }
h1 { max-width: 620px; margin-bottom: 8px; font-size: clamp(2rem, 4vw, 3.3rem); line-height: 1.06; letter-spacing: -.045em; }
.subtitle { margin-bottom: 0; color: var(--muted); font-size: 1.05rem; }

.connection-card {
  display: flex; align-items: center; gap: 12px; min-width: 285px; padding: 14px 17px;
  border: 1px solid var(--border); border-radius: 14px; background: var(--white);
  box-shadow: 0 9px 24px var(--transparent);
}
.connection-card strong, .connection-card small { display: block; }
.connection-card small { margin-top: 3px; color: var(--muted); font-size: .77rem; overflow-wrap: anywhere; }
.connection-dot, .legend-dot { display: inline-block; flex: none; width: 11px; height: 11px; border-radius: 50%; background: var(--upn-yellow); }
.connection-dot.connected, .legend-dot.live { background: var(--success); box-shadow: 0 0 0 4px var(--transparent); }
.legend-dot.simulated { background: var(--muted); }

.legend { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; margin-bottom: 22px; color: var(--muted); font-size: .84rem; }
.legend span { display: inline-flex; align-items: center; gap: 7px; }
.legend #last-refresh { margin-left: auto; }
.rooms-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }

.room-card { min-height: 254px; padding: 22px; border: 1px solid var(--border); border-radius: 18px; background: var(--white); box-shadow: 0 9px 25px var(--transparent); }
.room-card.is-live { border: 2px solid var(--primary); background: var(--white); box-shadow: 0 12px 30px var(--transparent); }
.room-header { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; }
.room-header h2 { margin-bottom: 20px; font-size: 1.35rem; letter-spacing: -.025em; }
.room-status { padding: 5px 9px; border-radius: 999px; font-size: .71rem; font-weight: 800; white-space: nowrap; }
.room-status.online { color: var(--white); background: var(--success); }
.room-status.waiting { color: var(--text); background: var(--upn-yellow); }
.room-status.demo { color: var(--white); background: var(--muted); }
.metrics { display: grid; gap: 12px; }
.metric { display: flex; align-items: center; gap: 11px; }
.metric-icon { display: grid; width: 33px; height: 33px; place-items: center; border-radius: 10px; color: var(--dark); background: var(--upn-yellow); font-size: 1rem; }
.metric small, .metric strong { display: block; }
.metric small { color: var(--muted); font-size: .72rem; }
.metric strong { margin-top: 1px; font-size: .91rem; }
.room-footer { display: flex; justify-content: space-between; gap: 8px; margin-top: 20px; padding-top: 14px; border-top: 1px solid var(--border); color: var(--muted); font-size: .72rem; }
.room-footer time { color: var(--dark); font-weight: 700; }
.error-message { min-height: 1.2em; margin: 18px 0 0; color: var(--danger); font-size: .9rem; }

@media (max-width: 900px) { .rooms-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) {
  .app-shell { width: min(100% - 24px, 520px); padding-top: 32px; }
  .hero { display: block; }
  .connection-card { min-width: 0; margin-top: 22px; }
  .legend #last-refresh { width: 100%; margin-left: 0; }
  .rooms-grid { grid-template-columns: 1fr; }
}