*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

[hidden] {
  display: none !important;
}

:root {
  --colour-primary: #2563eb;
  --colour-primary-hover: #1d4ed8;
  --colour-bg: #fafafa;
  --colour-bg-secondary: #f4f4f5;
  --colour-bg-tertiary: #e4e4e7;
  --colour-border: #d4d4d8;
  --colour-text: #18181b;
  --colour-text-secondary: #52525b;
  --colour-block-bg: #ffffff;
  --colour-block-border: #e4e4e7;
  --colour-shadow: rgba(0, 0, 0, 0.1);
  --colour-input-border: #d4d4d8;
  --colour-input-focus: #2563eb;
  --colour-primary-light: #dbeafe;

  --dmg-0: #e0f8d0;
  --dmg-1: #88c070;
  --dmg-2: #346856;
  --dmg-3: #081820;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --colour-bg: #09090b;
    --colour-bg-secondary: #18181b;
    --colour-bg-tertiary: #27272a;
    --colour-border: #3f3f46;
    --colour-text: #fafafa;
    --colour-text-secondary: #a1a1aa;
    --colour-block-bg: #18181b;
    --colour-block-border: #27272a;
    --colour-shadow: rgba(0, 0, 0, 0.4);
    --colour-input-border: #3f3f46;
    --colour-primary-light: #1e3a5f;
  }
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--colour-text);
  background: var(--colour-bg);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

.text-secondary {
  color: var(--colour-text-secondary);
  font-size: 0.875rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.625rem var(--space-lg);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1;
  border: none;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

.btn-primary {
  background: var(--colour-primary);
  color: #fff;
}

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

.btn-secondary {
  background: var(--colour-bg-secondary);
  color: var(--colour-text);
  border: 1px solid var(--colour-border);
}

.btn-secondary:hover {
  background: var(--colour-bg-tertiary);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.input {
  padding: var(--space-sm) var(--space-md);
  font-size: 1rem;
  color: var(--colour-text);
  background: var(--colour-bg);
  border: 1px solid var(--colour-input-border);
  border-radius: 0.375rem;
}

.input:focus {
  outline: none;
  border-color: var(--colour-input-focus);
  box-shadow: 0 0 0 3px var(--colour-primary-light);
}

.input-sm {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.875rem;
}

/* App layout */
.app {
  max-width: 960px;
  margin-inline: auto;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.toolbar h1 {
  font-family: Georgia, "Times New Roman", Times, serif;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.mode-switch {
  display: flex;
  gap: 2px;
  background: var(--colour-bg-tertiary);
  border-radius: 0.375rem;
  padding: 2px;
}

.mode-switch .btn {
  background: transparent;
  color: var(--colour-text-secondary);
  border: none;
}

.mode-switch .btn.active {
  background: var(--colour-block-bg);
  color: var(--colour-text);
  box-shadow: 0 1px 2px var(--colour-shadow);
}

.mode-switch .btn:disabled {
  background: transparent;
}

/* Panel */
.panel {
  background: var(--colour-block-bg);
  border: 1px solid var(--colour-block-border);
  border-radius: 0.5rem;
  padding: var(--space-lg);
}

/* Overview canvas */
.canvas-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  background: var(--dmg-0);
  border-radius: 0.375rem;
  overflow: hidden;
  cursor: default;
}

.canvas-wrap:focus {
  outline: 2px solid var(--colour-primary);
  outline-offset: 2px;
}

.canvas-wrap canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.drop-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--dmg-3);
  font-size: 1rem;
  font-weight: 500;
  padding: var(--space-lg);
  border: 2px dashed var(--dmg-2);
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background 0.15s;
}

.drop-overlay:hover,
.drop-overlay.dragover {
  background: rgba(136, 192, 112, 0.25);
}

.drop-overlay.loaded {
  opacity: 0;
  pointer-events: none;
}

.overview-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
  min-height: 1.75rem;
  flex-wrap: wrap;
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

#zoomLevel {
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  min-width: 2.5rem;
  text-align: center;
}

/* Tile editor */
.tile-editor-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .tile-editor-layout {
    flex-direction: row;
  }

  .tile-editor-left {
    flex: 1;
    min-width: 0;
  }

  .tile-editor-right {
    flex: 0 0 auto;
  }
}

.tile-nav {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  font-size: 0.875rem;
}

.tile-nav #tileIndex {
  flex: 1;
  text-align: center;
}

.btn-delete {
  background: transparent;
  color: #ef4444;
  border: 1px solid #ef4444;
}

.btn-delete:hover {
  background: #ef4444;
  color: #fff;
}

.tile-nav-hint {
  font-size: 0.75rem;
  color: var(--colour-text-secondary);
  text-align: center;
  margin-bottom: var(--space-sm);
}

.tile-nav-hint kbd {
  display: inline-block;
  padding: 0.1em 0.4em;
  margin-right: 2px;
  font-family: inherit;
  font-size: 0.75rem;
  background: var(--colour-bg-secondary);
  border: 1px solid var(--colour-border);
  border-radius: 0.25rem;
  line-height: 1.2;
}

.tile-grid-wrap {
  background: var(--dmg-0);
  border-radius: 0.375rem;
  overflow: auto;
  max-height: 360px;
  padding: var(--space-xs);
}

.tile-grid-wrap canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  cursor: pointer;
}

.tile-zoom-wrap {
  display: flex;
  justify-content: center;
}

.tile-zoom-wrap canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  cursor: crosshair;
  border-radius: 0.375rem;
  max-width: 100%;
  height: auto;
}

.palette-picker {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
  justify-content: center;
}

.palette-label {
  font-size: 0.875rem;
  font-weight: 500;
}

.palette-btn {
  width: 36px;
  height: 36px;
  border-radius: 0.375rem;
  border: 2px solid var(--colour-border);
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  padding: 0;
}

.palette-btn[data-color="0"] { background: var(--dmg-0); }
.palette-btn[data-color="1"] { background: var(--dmg-1); }
.palette-btn[data-color="2"] { background: var(--dmg-2); }
.palette-btn[data-color="3"] { background: var(--dmg-3); }

.palette-btn.active {
  border-color: var(--colour-primary);
  box-shadow: 0 0 0 2px var(--colour-primary);
  transform: scale(1.15);
}

/* Output */
.output-panel h2 {
  font-family: Georgia, "Times New Roman", Times, serif;
  font-size: 1.125rem;
  font-weight: 600;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.output-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.output-controls .input {
  width: 10rem;
}

.cluster-label {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8125rem;
  color: var(--colour-text-secondary);
  white-space: nowrap;
}

.cluster-input {
  width: 3rem !important;
  text-align: center;
}

.code-output {
  background: var(--colour-bg-secondary);
  border: 1px solid var(--colour-border);
  border-radius: 0.375rem;
  padding: var(--space-md);
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Monaco, Consolas, monospace;
  font-size: 0.8125rem;
  line-height: 1.5;
  overflow-x: auto;
  max-height: 24rem;
  overflow-y: auto;
  white-space: pre;
  tab-size: 2;
}

.code-output:focus {
  outline: none;
  border-color: var(--colour-input-focus);
  box-shadow: 0 0 0 3px var(--colour-primary-light);
}

.code-output.parse-error {
  border-color: #ef4444;
  box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.2);
}

.parse-status {
  font-size: 0.75rem;
  min-height: 1.25rem;
  margin-top: var(--space-xs);
}

.parse-status.error {
  color: #ef4444;
}

.parse-status.ok {
  color: var(--colour-text-secondary);
}

/* Font controls */
.font-link {
  margin-top: 0.25rem;
  display: block;
}

.font-link a {
  color: var(--colour-primary);
  text-decoration: underline;
  cursor: pointer;
}

.font-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm) var(--space-lg);
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--colour-bg-secondary);
  border: 1px solid var(--colour-border);
  border-radius: 0.375rem;
}

.font-control-label {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8125rem;
  color: var(--colour-text-secondary);
  white-space: nowrap;
}

.font-control-label input[type="range"] {
  width: 6rem;
  accent-color: var(--colour-primary);
}

.font-control-label input[type="checkbox"] {
  accent-color: var(--colour-primary);
}

.font-char-map {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  gap: 1px;
  background: var(--colour-border);
  border: 1px solid var(--colour-border);
  border-radius: 0.25rem;
  overflow: hidden;
}

.font-char-map .char-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--dmg-0);
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  cursor: pointer;
  font-size: 0;
  line-height: 0;
  position: relative;
}

.font-char-map .char-cell canvas {
  width: 100%;
  height: 100%;
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.font-char-map .char-cell.selected {
  outline: 2px solid #ef4444;
  outline-offset: -2px;
  z-index: 1;
}

.font-char-map .char-cell:hover {
  outline: 2px solid var(--colour-primary);
  outline-offset: -2px;
  z-index: 1;
}

/* Font debug reference */
#fontDebugPanel summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--colour-text-secondary);
}

.debug-content {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.font-debug-html-wrap {
  overflow-x: auto;
  border: 1px solid var(--colour-border);
  border-radius: 0.375rem;
  padding: var(--space-sm);
  background: var(--dmg-0);
}

.font-debug-grid {
  display: grid;
  grid-template-columns: repeat(16, auto);
  gap: 0;
  width: fit-content;
}

.font-debug-grid .glyph-cell {
  overflow: hidden;
  color: #000;
  background: var(--dmg-0);
  border: 1px solid rgba(0,0,0,0.08);
  box-sizing: content-box;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

/* Glyph info (VWF mode) */
.glyph-info {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--colour-text-secondary);
  margin-top: var(--space-sm);
  min-height: 1.25rem;
}

/* Character map wrap (VWF mode) */
.char-map-wrap {
  margin-top: var(--space-sm);
}

/* Font mode toggle */
.font-mode-label {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--colour-text-secondary);
  white-space: nowrap;
  cursor: pointer;
}

.font-mode-label input[type="checkbox"] {
  accent-color: var(--colour-primary);
}