:root {
  color-scheme: dark;
  --bg: #0e0e10;
  --fg: #e8e8ea;
  --muted: #8b8b94;
  --accent: #ff5500;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, sans-serif;
}

main {
  max-width: 56rem;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

h1 { margin: 0; font-size: 1.75rem; }
h2 { margin: 2.5rem 0 0.5rem; font-size: 1.25rem; }
.sub, #status { color: var(--muted); margin: 0.25rem 0; }
#status { min-height: 1.5rem; }
#status.error { color: #ff6b6b; }

a { color: var(--accent); }

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.slot { display: flex; flex-direction: column; gap: 0.75rem; }

.frames { position: relative; min-height: 166px; background: #18181b; }
.frames iframe { display: block; width: 100%; height: 166px; border: 0; }
.frames iframe.probe { position: absolute; inset: 0; visibility: hidden; }

button {
  padding: 0.75rem;
  border: 0;
  border-radius: 0.5rem;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button:disabled { background: #2a2a30; color: var(--muted); cursor: default; }

#board { margin: 0; padding-left: 1.5rem; }
#board li { padding: 0.25rem 0; }
#board .record { color: var(--muted); font-size: 0.875rem; margin-left: 0.5rem; }

.probes { position: absolute; width: 0; height: 0; overflow: hidden; }

@media (max-width: 42rem) {
  .pair { grid-template-columns: 1fr; }
}