:root {
  --bg: #0e1116;
  --surface: #161b22;
  --surface-2: #1f2630;
  --border: #2a323d;
  --text: #e6edf3;
  --text-dim: #9aa6b2;
  --accent: #58a6ff;
  --ok: #57c98a;
  --warn: #d29922;
  --bad: #f85149;
  --code: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Yu Gothic UI", system-ui, sans-serif;
}

main { max-width: 1280px; margin: 0 auto; padding: 32px 20px 80px; }
header { margin-bottom: 18px; }
h1 { font-size: 28px; margin: 0 0 8px; letter-spacing: -0.01em; }
h2 {
  font-size: 11.5px; font-weight: 600; margin: 0; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--text-dim);
}
.lede { margin: 0; color: var(--text-dim); max-width: 880px; }
.lede strong { color: var(--text); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--code); font-size: 12.5px;
  background: var(--surface-2); padding: 1px 5px; border-radius: 3px;
  border: 1px solid var(--border);
}

section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 12px;
}

/* ────────── toolbar ────────── */

.toolbar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}

.spacer { flex: 1; }

button {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 6px;
  font: inherit;
  font-size: 12.5px;
  font-family: var(--code);
  cursor: pointer;
}

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

.status {
  font-family: var(--code); font-size: 12px; color: var(--text-dim);
}

.status.ok { color: var(--ok); }
.status.bad { color: var(--bad); }

.fps {
  font-family: var(--code); font-size: 12px; color: var(--text-dim);
  min-width: 60px; text-align: right;
}

/* ────────── editor + canvas ────────── */

.editor-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 0;
  background: transparent;
  border: none;
}

@media (min-width: 900px) {
  .editor-section { grid-template-columns: 1fr 1fr; }
}

.editor-pane, .canvas-pane {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  display: flex;
  flex-direction: column;
}

.pane-head {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  margin-bottom: 8px;
  min-height: 22px;
}

.uniforms {
  display: flex; flex-wrap: wrap; gap: 6px;
  font-family: var(--code); font-size: 10.5px;
  color: var(--text-dim);
}

.uniform-chip {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
}

.uniform-chip strong { color: var(--accent); }

.canvas-hint {
  font-size: 11px; color: var(--text-dim); font-family: var(--code);
}

#editor {
  flex: 1;
  width: 100%;
  min-height: 380px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--code);
  font-size: 12.5px;
  line-height: 1.55;
  padding: 12px;
  border-radius: 6px;
  resize: vertical;
  outline: none;
  tab-size: 2;
}

#editor:focus { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.18); }

#canvas {
  width: 100%;
  height: 380px;
  display: block;
  background: #000;
  border-radius: 6px;
  border: 1px solid var(--border);
  image-rendering: pixelated;
}

/* ────────── errors ────────── */

.errors-section h2 { margin-bottom: 8px; }

.errors {
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--code);
  font-size: 12px;
}

.errors li {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--bad);
  border-radius: 4px;
  padding: 6px 10px;
  margin-bottom: 4px;
  display: flex;
  gap: 10px;
}

.errors li.warning { border-left-color: var(--warn); }

.err-line {
  color: var(--text-dim);
  min-width: 56px;
  font-weight: 600;
}

.err-line.warn { color: var(--warn); }
.err-line.err  { color: var(--bad); }

.err-msg { color: var(--text); word-break: break-word; }

/* ────────── footer ────────── */

footer { margin-top: 24px; font-size: 12.5px; color: var(--text-dim); }
footer p { margin: 4px 0; }