:root {
  --bg: #ffffff;
  --panel: #fafafa;
  --border: #ccc;
  --text: #222;
  --muted: #666;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1c;
    --panel: #262626;
    --border: #444;
    --text: #ddd;
    --muted: #999;
  }
}

* {
  box-sizing: border-box;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  padding: 16px 20px;
}

h1 {
  font-size: 1.3rem;
  font-weight: bold;
  margin: 0 0 4px;
}

p.subtitle {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 14px;
}

main {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.views {
  display: flex;
  gap: 12px;
  flex: 3;
  min-width: 300px;
  flex-wrap: wrap;
}

.view-panel {
  flex: 1;
  min-width: 260px;
}

.view-panel h2 {
  font-size: 0.9rem;
  font-weight: bold;
  margin: 0 0 4px;
}

.view-panel .frame {
  background: #000;
  border: 1px solid var(--border);
}

.view-panel video,
.view-panel canvas {
  width: 100%;
  display: block;
}

.controls {
  flex: 1;
  min-width: 220px;
  max-width: 280px;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 12px 14px;
}

.control {
  margin-bottom: 14px;
}

.control label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 2px;
}

.control .value {
  color: var(--muted);
}

.control input[type="range"] {
  width: 100%;
}

.control .hint {
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 2px;
}

.buttons {
  margin: 10px 0;
}

button {
  padding: 6px 14px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
  margin-right: 6px;
}

button:hover:not(:disabled) {
  background: var(--border);
}

#start-btn {
  background: #2e7d32;
  color: #fff;
  border-color: #2e7d32;
}

#start-btn:hover:not(:disabled) {
  background: #256428;
}

#stop-btn {
  background: #c62828;
  color: #fff;
  border-color: #c62828;
}

#stop-btn:hover:not(:disabled) {
  background: #a02121;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.status {
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 8px;
  margin-top: 10px;
}

.status .fps {
  font-size: 1.4rem;
  font-weight: bold;
  color: var(--text);
}

.legend {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 6px 0 0;
}

@media (max-width: 700px) {
  main {
    flex-direction: column;
  }
  .controls {
    max-width: none;
    width: 100%;
  }
}