:root {
  --bg: #0e1116;
  --surface: #161b22;
  --surface-2: #1f2630;
  --border: #2a323d;
  --text: #e6edf3;
  --text-dim: #9aa6b2;
  --accent: #58a6ff;
  --canvas-bg: #fafaf9;
  --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;
  /* prevent default touch behaviors stealing pointer input */
  touch-action: none;
  overscroll-behavior: contain;
}

main {
  max-width: 920px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header {
  margin-bottom: 18px;
}

h1 {
  font-size: 28px;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.lede {
  margin: 0;
  color: var(--text-dim);
  max-width: 720px;
}

.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: 14px 16px;
  margin-bottom: 12px;
}

/* ────────── toolbar ────────── */

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}

.tool-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tool-label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.colors {
  display: flex;
  gap: 6px;
}

.color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
  transition: transform 0.1s, border-color 0.12s;
}

.color-swatch:hover {
  transform: scale(1.1);
}

.color-swatch.active {
  border-color: var(--accent);
  transform: scale(1.1);
}

.size-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--text-dim);
  cursor: pointer;
}

#size {
  width: 100px;
  accent-color: var(--accent);
}

.size-value {
  font-family: var(--code);
  font-size: 12px;
  min-width: 36px;
  text-align: right;
}

.buttons {
  margin-left: auto;
}

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;
  cursor: pointer;
  font-family: var(--code);
}

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

/* ────────── canvas ────────── */

.canvas-section {
  padding: 0;
  overflow: hidden;
  background: var(--canvas-bg);
}

#canvas {
  display: block;
  width: 100%;
  height: 480px;
  cursor: crosshair;
  background:
    linear-gradient(to right, rgba(0, 0, 0, 0.04) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(to bottom, rgba(0, 0, 0, 0.04) 1px, transparent 1px) 0 0 / 24px 24px,
    var(--canvas-bg);
  /* Don't let touch gestures (pan/zoom/swipe) hijack drawing input. */
  touch-action: none;
}

/* ────────── status ────────── */

.status-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

@media (min-width: 600px) {
  .status-row {
    grid-template-columns: repeat(4, 1fr);
  }
}

.status-item {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
}

.status-label {
  font-size: 10.5px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 4px;
}

.status-item code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: 14px;
  color: var(--text);
}

/* ────────── footer ────────── */

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

footer p {
  margin: 4px 0;
}