:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --line: #d4d4d4;
  --ink: #171717;
  --muted: #666666;
  --active: #111111;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, sans-serif;
}

button,
textarea,
input {
  font: inherit;
}

.app {
  padding: 8px;
}

.editor-shell {
  max-width: 1200px;
  margin: 0 auto;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 168px;
  gap: 6px;
  align-items: start;
}

.canvas-stage {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 4px;
  align-items: start;
}

.canvas-toolbar {
  display: grid;
  gap: 8px;
  padding: 2px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.toolbar-group {
  display: grid;
  gap: 4px;
  padding-bottom: 8px;
  border-bottom: 1px solid #ececec;
}

.toolbar-group:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.tool-button,
.export-button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  cursor: pointer;
}

.tool-button:disabled {
  color: #b8b8b8;
  cursor: default;
}

.tool-button-history {
  background: #f5f7fa;
  color: #3f5368;
  border-color: #cfd9e3;
}

.tool-button-history:hover:not(:disabled) {
  background: #e8eef5;
}

.tool-button-action {
  background: #fbfbfb;
  color: #555555;
}

.tool-button {
  width: 28px;
  height: 28px;
  padding: 0;
  display: grid;
  place-items: center;
}

.material-symbols-outlined {
  font-size: 18px;
  line-height: 1;
}

.tool-button.is-active {
  background: var(--active);
  color: #ffffff;
  border-color: var(--active);
}

.canvas-wrap {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 2px;
}

.canvas-meta {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 4px;
  font-size: 12px;
  color: var(--muted);
}

.meta-row {
  display: flex;
  gap: 8px;
}

.canvas-viewport {
  position: relative;
  width: min(100%, 920px);
}

#pixelCanvas {
  display: block;
  width: 100%;
  height: auto;
  background: #ffffff;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  display: none;
  background-image:
    linear-gradient(to right, rgba(0, 0, 0, 0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.22) 1px, transparent 1px);
  background-size: calc(100% / 252) calc(100% / 252);
}

.canvas-viewport.grid-on .grid-overlay {
  display: block;
}

.export-dock {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 4px;
}

.export-bar {
  display: grid;
  gap: 4px;
}

.export-options {
  display: grid;
  gap: 4px;
  margin-top: 4px;
}

.export-toggle {
  display: grid;
  grid-template-columns: 14px 1fr;
  gap: 6px;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
}

.function-name-input {
  width: 100%;
  min-height: 28px;
  border: 1px solid var(--line);
  padding: 4px 6px;
  outline: none;
}

.function-name-input.is-hidden {
  display: none;
}

.function-name-input.is-flashing {
  border-color: #d33;
  box-shadow: 0 0 0 2px rgba(221, 51, 51, 0.18);
  animation: flash-input 420ms ease 2;
}

.export-button {
  padding: 4px 8px;
  min-height: 28px;
  width: 100%;
}

.export-button-secondary {
  color: var(--muted);
}

.output-panel {
  margin-top: 4px;
}

.output-panel.is-collapsed {
  display: none;
}

#output {
  width: 100%;
  min-height: 220px;
  resize: vertical;
  border: 1px solid var(--line);
  padding: 6px;
  font-family: Consolas, monospace;
  font-size: 12px;
  line-height: 1.3;
  background: #ffffff;
  color: var(--ink);
}

@keyframes flash-input {
  0% {
    border-color: #d33;
    box-shadow: 0 0 0 2px rgba(221, 51, 51, 0.18);
  }

  50% {
    border-color: #ff8f8f;
    box-shadow: 0 0 0 3px rgba(221, 51, 51, 0.28);
  }

  100% {
    border-color: #d33;
    box-shadow: 0 0 0 2px rgba(221, 51, 51, 0.18);
  }
}

@media (max-width: 720px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .canvas-stage {
    grid-template-columns: 1fr;
  }

  .canvas-toolbar {
    grid-template-columns: repeat(3, auto);
    width: fit-content;
  }

  .toolbar-group {
    grid-auto-flow: column;
    grid-auto-columns: 28px;
    padding-right: 8px;
    padding-bottom: 0;
    border-right: 1px solid #ececec;
    border-bottom: 0;
  }

  .toolbar-group:last-child {
    padding-right: 0;
    border-right: 0;
  }
}