:root {
  --bg: #0d1117;
  --panel: #161b22;
  --border: #30363d;
  --text: #c9d1d9;
  --muted: #8b949e;
  --accent: #2ea043;
  --danger: #f85149;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  background: radial-gradient(circle at top left, #161b22, #0d1117 55%);
  color: var(--text);
}

.layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 16px;
}

.panel {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 95%, black);
  border-radius: 12px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

h1,
h2 {
  margin: 0;
  font-size: 1rem;
}

.actions {
  display: flex;
  gap: 8px;
}

button {
  border: 1px solid var(--border);
  background: #21262d;
  color: var(--text);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
}

#runBtn {
  background: color-mix(in srgb, var(--accent) 30%, #21262d);
}

#stopBtn {
  background: color-mix(in srgb, var(--danger) 25%, #21262d);
}

textarea {
  width: 100%;
  flex: 1;
  min-height: 320px;
  resize: vertical;
  background: #0b1016;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  font-size: 13px;
  line-height: 1.45;
}

.hint {
  color: var(--muted);
  margin: 8px 0 0;
  font-size: 12px;
}

.status {
  color: var(--muted);
  font-size: 12px;
}

canvas {
  width: 100%;
  max-width: 600px;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #000;
  image-rendering: pixelated;
}

#log {
  margin: 8px 0 0;
  min-height: 110px;
  max-height: 200px;
  overflow: auto;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #0b1016;
  color: #9ecbff;
  font-size: 12px;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }
}