:root {
  /* Brand and text */
  --colour-background: #dce5e9;
  --colour-panel: #c2d0d7;
  --colour-text: #0b2833;
  --colour-muted: #48626f;
  --colour-border: #374f5a;

  /* Buttons */
  --colour-button-background: #ffffff;
  --colour-button-hover: #dce5e9;
  --colour-primary: #1f2933;
  --colour-primary-hover: #374f5a;
  --colour-primary-text: #ffffff;

  /* Drawing */
  --colour-pen-default: #111111;
  --colour-brush-preview: #1f2933;
  --colour-eraser-preview: rgba(31, 41, 51, 0.16);
  --colour-eraser-preview-border: #1f2933;
  --colour-eraser-composite: rgba(0, 0, 0, 1);

  /* Dice and canvas */
  --colour-dice-background: #ffffff;
  --colour-canvas-background: #ffffff;
  --colour-board-shadow: rgba(0, 0, 0, 0.15);
  --colour-empty-background: rgba(255, 255, 255, 0.7);
}

* {
  box-sizing: border-box;
}
a:link, a:visited {
  color: var(--colour-primary);
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--colour-background);
  color: var(--colour-text);
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--colour-border);
  background: var(--colour-panel);
}

h1 {
  margin: 0;
  font-size: 1.25rem;
}

p {
  margin: 0.25rem 0 0;
  color: var(--colour-muted);
}

.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: calc(100vh - 82px);
}

.tools {
  padding: 1rem;
  border-right: 1px solid var(--colour-border);
  background: var(--colour-panel);
}

.tool-group {
  margin-top: 1rem;
}

label,
.tool-label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

input[type="color"],
button,
.file-button {
  width: 100%;
  border: 1px solid var(--colour-border);
  border-radius: 0.65rem;
  background: var(--colour-button-background);
  color: var(--colour-text);
  font: inherit;
}

button,
.file-button {
  padding: 0.65rem 0.75rem;
  cursor: pointer;
  text-align: center;
  font-weight: 700;
}

button:hover,
.file-button:hover {
  background: var(--colour-button-hover);
}

.primary {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 0.45rem;
  background: var(--colour-primary);
  color: var(--colour-primary-text);
  border-color: var(--colour-primary);
}

.primary:hover {
  background: var(--colour-primary-hover);
}

.file-button input {
  display: none;
}

input[type="range"] {
  width: 100%;
}

.size-control {
  display: grid;
  grid-template-columns: 1fr 52px;
  gap: 0.75rem;
  align-items: center;
}

.brush-preview-wrap {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border: 1px solid var(--colour-border);
  border-radius: 0.65rem;
  background: var(--colour-button-background);
}

.brush-preview {
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--colour-brush-preview);
}

.brush-preview.eraser {
  background: var(--colour-eraser-preview);
  border: 2px solid var(--colour-eraser-preview-border);
}

.tool-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.tool-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
}

.tool-button.active {
  background: var(--colour-primary);
  border-color: var(--colour-primary);
  color: var(--colour-primary-text);
}

.button-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.65rem;
  margin-top: 1rem;
}

.play-area {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.dice-panel {
  display: grid;
  grid-template-columns: 140px 180px 140px;
  gap: 0.85rem;
  align-items: center;
}

.dice-panel .primary,
.dice-panel .bonus-roll {
  width: 140px;
}

.bonus-roll {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 0.45rem;
}

.dice-result {
  min-width: 180px;
  min-height: 52px;
  padding: 0.45rem 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  border: 1px solid var(--colour-border);
  border-radius: 0.65rem;
  background: var(--colour-dice-background);
  font-size: 2.25rem;
  font-weight: 800;
}

.dice-plus {
  color: var(--colour-muted);
  font-size: 1.25rem;
}

.die-icon {
  line-height: 1;
  font-size: 2.25rem;
}

.dice-result.rolling .die-icon {
  animation: dice-shake 0.12s linear infinite;
}

@keyframes dice-shake {
  0% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(2px, -2px) rotate(8deg); }
  50% { transform: translate(-2px, 1px) rotate(-8deg); }
  75% { transform: translate(1px, 2px) rotate(5deg); }
  100% { transform: translate(0, 0) rotate(0deg); }
}

.stage-wrap {
  position: relative;
  overflow: auto;
  padding: 1rem;
  min-width: 0;
}

.board {
  position: relative;
  display: none;
  background: var(--colour-canvas-background);
  box-shadow: 0 8px 25px var(--colour-board-shadow);
}

.board canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
}

#sheetCanvas {
  z-index: 1;
}

#drawCanvas {
  z-index: 2;
  cursor: crosshair;
}

#drawCanvas.eraser-cursor {
  cursor: cell;
}

.empty-state {
  min-height: 60vh;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 0.4rem;
  color: var(--colour-muted);
  border: 2px dashed var(--colour-border);
  border-radius: 1rem;
  background: var(--colour-empty-background);
}

.empty-state strong {
  color: var(--colour-text);
  font-size: 1.1rem;
}

.hint {
  margin-top: 1rem;
  font-size: 0.9rem;
}

@media (max-width: 800px) {
  .topbar,
  .layout {
    display: block;
  }

  .dice-panel {
    grid-template-columns: 1fr 1.2fr 1fr;
    width: 100%;
    margin-top: 0.75rem;
  }

  .dice-panel .primary,
  .dice-panel .bonus-roll {
    width: 100%;
  }

  .dice-result {
    min-width: 0;
    min-height: 52px;
    font-size: 2.25rem;
  }

  .die-icon {
    font-size: 2.25rem;
  }

  .tools {
    border-right: 0;
    border-bottom: 1px solid var(--colour-border);
  }

  .button-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 980px) and (min-width: 801px) {
  .topbar {
    align-items: flex-start;
  }

  .dice-panel {
    grid-template-columns: 1fr 1.25fr 1fr;
    width: min(100%, 480px);
  }

  .dice-panel .primary,
  .dice-panel .bonus-roll {
    width: 100%;
  }
}