:root {
  --bg: #111418;
  --fg: #e6e6e6;
  --dim: #888;
  --accent: #ffb86b;
  --panel: #1b1f25;
  --border: #2a2f37;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

header {
  padding: 16px 24px 8px;
  border-bottom: 1px solid var(--border);
}

header h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 500;
}

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

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 16px;
  padding: 16px 24px;
  max-width: 1400px;
  margin: 0 auto;
}

#canvas-wrap {
  position: relative;
  background: #000;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

#canvas {
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
}

#canvas:focus {
  box-shadow: inset 0 0 0 2px var(--accent);
}

#loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dim);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: rgba(0,0,0,0.6);
  pointer-events: none;
}

#controls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px 16px;
}

#controls h2 {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}

#controls .hint {
  margin: 0 0 12px;
  color: var(--dim);
  font-size: 12px;
}

#controls ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

#controls li {
  padding: 3px 0;
  font-size: 12px;
  color: #c8c8c8;
}

kbd {
  display: inline-block;
  padding: 1px 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  background: #0a0c10;
  border: 1px solid #333;
  border-radius: 3px;
  color: var(--fg);
}

footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  color: var(--dim);
  font-size: 12px;
  text-align: center;
}

footer a {
  color: var(--dim);
  text-decoration: none;
}

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

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; }
}