:root {
  color-scheme: dark;
  --ui: rgba(20, 20, 20, 0.88);
  --text: #eee;
  --muted: #999;
  --field: #1f1f1f;
  --line: #3a3a3a;
  --accent: #8ab4ff;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #000;
  color: var(--text);
  font: 14px/1.4 system-ui, -apple-system, sans-serif;
}

body.idle {
  cursor: none;
}

#stage {
  position: fixed;
  inset: 0;
  background: #000;
}

#tiles {
  position: absolute;
  inset: 0;
}

.tile {
  position: absolute;
  overflow: hidden;
  background: #111;
}

.tile video {
  position: absolute;
  inset: 2px;
  width: calc(100% - 4px);
  height: calc(100% - 4px);
  object-fit: cover;
}

#placeholder {
  position: absolute;
  inset: 0;
  margin: 0;
  display: grid;
  place-items: center;
  color: #666;
}

#message {
  position: absolute;
  top: 16px;
  left: 16px;
  right: 16px;
  margin: 0;
  padding: 10px 14px;
  border-radius: 6px;
  background: #4a1d1d;
  color: var(--text);
}

#controls {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px 16px;
  background: var(--ui);
  transition: opacity 0.4s;
}

#controls.hidden {
  opacity: 0;
  pointer-events: none;
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin-bottom: 8px;
}

label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
}

input,
button {
  font: inherit;
  color: var(--text);
  background: var(--field);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 10px;
}

input[type="url"] {
  flex: 1 1 320px;
  min-width: 0;
}

input[type="number"] {
  width: 72px;
}

input[type="range"] {
  width: 120px;
  accent-color: var(--accent);
}

button {
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

.hint {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 600px) {
  #controls {
    padding: 12px 16px;
  }

  .hint {
    display: none;
  }
}