:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel-2: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
  overscroll-behavior: none;
  touch-action: none;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
}

#stage {
  flex: 1 1 auto;
  display: block;
  width: 100%;
  touch-action: none;
  image-rendering: pixelated;
}

#toolbar {
  flex: 0 0 auto;
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 6px 8px calc(6px + var(--safe-bottom));
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.element-row {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 2px;
}
.element-row::-webkit-scrollbar {
  display: none;
}

.element-btn {
  flex: 0 0 auto;
  min-width: 56px;
  padding: 8px 6px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font-size: 12px;
  font-weight: 600;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}
.element-btn .swatch {
  width: 22px;
  height: 22px;
  border-radius: 5px;
  border: 1px solid rgba(255, 255, 255, 0.15);
}
.element-btn.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.4);
}

.controls-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 2px;
}
.ctrl {
  flex: 0 0 auto;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.ctrl:active {
  transform: translateY(1px);
}
.brush-size {
  font-size: 14px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  min-width: 44px;
  text-align: center;
}

.toast {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(22, 27, 34, 0.95);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  font-size: 13px;
  z-index: 10;
  pointer-events: none;
}