:root {
  --bg: #f8f8f8;
  --text: #111;
  --muted: #555;
  --link: #334466;
  --panel-bg: #fff;
  --panel-border: #ddd;
  --label: #333;
  --input-bg: #fff;
  --input-border: #ddd;
  --tool-bg: #fff;
  --tool-border: #aaa;
  --tool-hover: #eee;
  --tool-active-bg: #333;
  --tool-active-fg: #fff;
  --swatch-border: #333;
  --cell-border: #bbb;
  --select-outline: #000;
  --heading: #666;
  --placeholder: #aaa;
  --faint: #888;
  --grid-bg: #fff;
  --grid-border: #ddd;
  --swatch-item-border: rgba(0,0,0,.12);
  --footer-bar: 0px;
}
[data-theme="dark"] {
  --bg: #141414;
  --text: #f0f0f0;
  --muted: #aaa;
  --link: #9ab4d0;
  --panel-bg: #222;
  --panel-border: #444;
  --label: #ddd;
  --input-bg: #1a1a1a;
  --input-border: #555;
  --tool-bg: #2a2a2a;
  --tool-border: #555;
  --tool-hover: #333;
  --tool-active-bg: #e8e8e8;
  --tool-active-fg: #111;
  --swatch-border: #ccc;
  --cell-border: #555;
  --select-outline: #fff;
  --heading: #999;
  --placeholder: #666;
  --faint: #777;
  --grid-bg: #1a1a1a;
  --grid-border: #444;
  --swatch-item-border: rgba(255,255,255,.15);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 16px;
  padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right))
    max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  font-family: 'Roboto Slab', serif;
  line-height: 1.5;
  background: var(--bg);
  color: var(--text);
}
button, input, label, select {
  font-family: inherit;
}
h1, h2 {
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  font-weight: bold;
}
h1 {
  font-size: 1.75rem;
  letter-spacing: 2px;
  margin: 0 0 8px;
}
.theme-toggle {
  position: fixed;
  top: max(16px, env(safe-area-inset-top));
  right: max(16px, env(safe-area-inset-right));
  z-index: 20;
}
.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}
.theme-toggle svg[hidden] {
  display: none;
}
.hint {
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 12px;
  max-width: 40em;
}
.hint a { color: var(--link); }
.workspace {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: flex-start;
}
.grid-panel {
  flex: 0 1 auto;
  width: min(100%, 528px);
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}
.grid-stage {
  flex: 1 1 0;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.grid-stage .grid-wrap {
  width: 100%;
  height: auto;
  max-width: 100%;
  max-height: 100%;
  aspect-ratio: 1 / 1;
  flex-shrink: 0;
}
.paint-controls,
.tone-ramp-wrap,
.grid-sizing {
  flex-shrink: 0;
}
.paint-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.tone-ramp-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  background: var(--panel-bg);
}
.tone-ramp-label {
  flex: 0 0 auto;
  font: inherit;
  font-size: 12px;
  color: var(--label);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  touch-action: manipulation;
}
.tone-ramp-label:hover,
.tone-ramp-label:focus-visible {
  color: var(--text);
  text-decoration: underline;
}
.tone-ramp {
  display: flex;
  flex: 1;
  min-width: 0;
  gap: 4px;
}
.tone-ramp button {
  flex: 1;
  min-width: 0;
  height: 28px;
  border: 1px solid var(--swatch-item-border);
  border-radius: 3px;
  padding: 0;
  cursor: pointer;
  touch-action: manipulation;
}
.tone-ramp button[aria-selected="true"] {
  outline: 2px solid var(--select-outline);
  outline-offset: 2px;
}
.grid-sizing {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  padding: 8px 10px;
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  background: var(--panel-bg);
}
.grid-sizing-label {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1 1 180px;
  min-width: 0;
  font-size: 12px;
  color: var(--label);
  cursor: default;
}
.grid-sizing-label span {
  flex: 0 0 6.5em;
}
.grid-sizing-label input[type="range"] {
  flex: 1;
  min-width: 0;
  margin: 0;
  cursor: pointer;
  accent-color: #c0c0c0;
}
.grid-sizing-label output {
  flex: 0 0 2.5em;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--muted);
}
.grid-sizing-units {
  flex: 0 0 auto;
  margin: 0;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  white-space: nowrap;
}
.grid-wrap {
  position: relative;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  height: auto;
  padding: 0;
  background: var(--grid-bg);
  border: 1px solid var(--grid-border);
  border-radius: 4px;
  overflow: hidden;
  flex-shrink: 0;
}
.grid-wrap table {
  position: absolute;
  top: 0;
  left: 0;
  margin: 0;
  border-collapse: collapse;
  border-spacing: 0;
  table-layout: fixed;
  line-height: 0;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.grid-wrap tr {
  margin: 0;
  padding: 0;
  line-height: 0;
}
.grid-wrap td {
  padding: 0;
  margin: 0;
  line-height: 0;
  font-size: 0;
  vertical-align: top;
  overflow: hidden;
  border: 1px solid var(--cell-border);
  cursor: crosshair;
}
.grid-wrap td.silver:not(.filled) { background-color: #c0c0c0; }
.grid-wrap td.silver { cursor: default; }
.grid-wrap.no-borders td { border: 0; }
.palette-panel {
  flex: 1 1 260px;
  min-width: 0;
  max-width: 400px;
}
.current {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1 1 auto;
  min-width: 0;
}
.current-swatch {
  width: 40px;
  height: 40px;
  border: 2px solid var(--swatch-border);
  border-radius: 4px;
  flex-shrink: 0;
}
.current-label {
  font-size: 13px;
  color: var(--label);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.tool-row {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  flex: 0 0 auto;
  margin-left: auto;
}
.color-picker-backdrop {
  position: fixed;
  inset: 0;
  z-index: 25;
  background: rgba(0, 0, 0, 0.35);
  cursor: default;
}
.color-picker-backdrop[hidden] {
  display: none;
}
.color-picker-popover[hidden] {
  display: none;
}
.color-picker-popover {
  position: fixed;
  z-index: 30;
  width: min(280px, calc(100vw - max(16px, env(safe-area-inset-left)) - max(16px, env(safe-area-inset-right))));
  padding: 12px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.18);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.color-picker-popover.is-mobile {
  left: max(16px, env(safe-area-inset-left));
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  width: auto;
}
.color-picker-sv {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 6px;
  overflow: hidden;
  touch-action: none;
  cursor: crosshair;
}
.color-picker-sv-white,
.color-picker-sv-black {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.color-picker-sv-white {
  background: linear-gradient(to right, #fff, transparent);
}
.color-picker-sv-black {
  background: linear-gradient(to top, #000, transparent);
}
.color-picker-sv-cursor {
  position: absolute;
  width: 14px;
  height: 14px;
  margin: -7px 0 0 -7px;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.45);
  pointer-events: none;
}
.color-picker-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 14px;
  margin: 0;
  border: none;
  border-radius: 7px;
  outline: none;
  cursor: pointer;
  touch-action: manipulation;
}
.color-picker-hue {
  background: linear-gradient(
    to right,
    #f00 0%,
    #ff0 17%,
    #0f0 33%,
    #0ff 50%,
    #00f 67%,
    #f0f 83%,
    #f00 100%
  );
}
.color-picker-sat {
  background: linear-gradient(to right, var(--picker-sat-start, #888), var(--picker-sat-end, #f00));
}
.color-picker-val {
  background: linear-gradient(to right, var(--picker-val-start, #000), var(--picker-val-end, #fff));
}
.color-picker-slider::-webkit-slider-runnable-track {
  height: 14px;
  border-radius: 7px;
  background: transparent;
}
.color-picker-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  margin-top: -4px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: var(--picker-thumb, #fff);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.35), inset 0 0 0 1px rgba(0, 0, 0, 0.12);
}
.color-picker-slider::-moz-range-track {
  height: 14px;
  border-radius: 7px;
  background: inherit;
  border: none;
}
.color-picker-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: var(--picker-thumb, #fff);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.35), inset 0 0 0 1px rgba(0, 0, 0, 0.12);
}
.color-picker-hex-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.color-picker-preview {
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}
.color-picker-hex {
  flex: 1;
  min-width: 0;
  box-sizing: border-box;
  font: inherit;
  font-size: 13px;
  letter-spacing: 1px;
  padding: 8px 10px;
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  background: var(--input-bg);
  color: var(--text);
}
button.tool {
  font: inherit;
  font-size: 13px;
  letter-spacing: 2px;
  padding: 8px 12px;
  border: 1px solid var(--tool-border);
  border-radius: 4px;
  background: var(--tool-bg);
  color: var(--text);
  cursor: pointer;
  touch-action: manipulation;
}
button.tool-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  letter-spacing: 0;
}
button.tool-icon svg {
  width: 20px;
  height: 20px;
  display: block;
  pointer-events: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}
button.tool:hover { background: var(--tool-hover); }
button.tool[aria-pressed="true"] {
  background: var(--tool-active-bg);
  color: var(--tool-active-fg);
  border-color: var(--tool-active-bg);
}
.palette-scroll {
  padding: 4px;
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  background: var(--panel-bg);
}
.color-group { margin-bottom: 14px; }
.color-group:last-child { margin-bottom: 0; }
.color-group h2 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--heading);
  margin: 0 0 6px;
  padding: 0 2px;
}
.palette {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(28px, 1fr));
  gap: 4px;
}
.palette button {
  width: 100%;
  aspect-ratio: 1;
  border: 1px solid var(--swatch-item-border);
  border-radius: 3px;
  padding: 0;
  cursor: pointer;
  touch-action: manipulation;
}
.palette button[aria-selected="true"] {
  outline: 2px solid var(--select-outline);
  outline-offset: 2px;
}
.recent-section {
  margin-bottom: 14px;
}
.recent-section h2 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--heading);
  margin: 0 0 6px;
  padding: 0 2px;
}
.recent {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  min-height: 32px;
  padding: 6px;
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  background: var(--panel-bg);
}
.recent:empty::before,
.recent-empty {
  font-size: 12px;
  color: var(--placeholder);
  padding: 4px 2px;
}
.recent button {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border: 1px solid var(--swatch-item-border);
  border-radius: 3px;
  padding: 0;
  cursor: pointer;
  touch-action: manipulation;
}
.recent button[aria-selected="true"] {
  outline: 2px solid var(--select-outline);
  outline-offset: 2px;
}
.loading-palette {
  font-size: 13px;
  color: var(--faint);
  padding: 8px;
}
.page-head {
  padding-right: 3rem;
}
.site-footer {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-top: 12px;
  flex-shrink: 0;
}
.site-footer > a {
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  font-size: 1.1em;
  font-weight: normal;
  letter-spacing: 2px;
  line-height: 1;
  color: var(--text);
  text-decoration: underline;
  border: none;
  padding-top: 0.7em;
}
.site-footer > a:focus,
.site-footer > a:hover {
  color: var(--link);
}
@media (orientation: landscape) {
  :root {
    --footer-bar: calc(2.75rem + env(safe-area-inset-bottom, 0px));
  }
  body {
    display: flex;
    flex-direction: column;
    height: 100dvh;
    max-height: 100dvh;
    overflow: hidden;
    padding-bottom: max(8px, env(safe-area-inset-bottom));
  }
  .page {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    overflow: hidden;
  }
  .page-head {
    flex-shrink: 0;
  }
  .hint {
    margin-bottom: 8px;
  }
  .workspace {
    flex: 1;
    min-height: 0;
    flex-wrap: nowrap;
    align-items: stretch;
    overflow: hidden;
  }
  .grid-panel {
    flex: 0 1 auto;
    width: min(42vw, 528px);
    max-width: min(42vw, 528px);
    height: 100%;
  }
  .grid-stage {
    container-type: size;
  }
  .grid-stage .grid-wrap {
    width: min(100cqw, 100cqh);
  }
  .palette-panel {
    flex: 1 1 0;
    min-width: 0;
    max-width: none;
    width: 0;
    height: 100%;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }
  .recent-section {
    flex-shrink: 0;
  }
  .palette-scroll {
    flex: 1 1 0;
    min-height: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 12px;
  }
  .site-footer {
    flex-shrink: 0;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    min-height: var(--footer-bar);
    padding: 10px 0 max(8px, env(safe-area-inset-bottom));
    border-top: 1px solid var(--panel-border);
    background: var(--bg);
  }
  .site-footer > a {
    padding-top: 0;
    text-decoration: none;
    border-bottom: 1px solid var(--text);
  }
  .site-footer > a:focus,
  .site-footer > a:hover {
    border-bottom-color: var(--link);
  }
}
@media (max-width: 720px) and (orientation: landscape) {
  .grid-panel {
    width: min(48vw, 528px);
    max-width: min(48vw, 528px);
  }
  .palette-panel {
    flex: 1 1 0;
    min-width: 0;
    width: 0;
  }
  .paint-controls {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
  }
  .current {
    flex: 1 1 auto;
    width: auto;
  }
  .tool-row {
    margin-left: auto;
    width: auto;
  }
}
@media (max-width: 720px) and (orientation: portrait) {
  body {
    min-height: 100dvh;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .workspace { flex-direction: column; }
  .grid-panel {
    width: 100%;
    max-width: 100%;
    flex-shrink: 0;
    max-height: min(72dvh, 100%);
  }
  .grid-stage {
    width: 100%;
    container-type: size;
  }
  .grid-stage .grid-wrap {
    width: min(100cqw, 100cqh);
  }
  .palette-panel {
    width: 100%;
    max-width: 100%;
    flex: 0 0 auto;
  }
}
@media (max-width: 720px) {
  .paint-controls {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .current {
    flex: none;
    width: 100%;
  }
  .tool-row {
    margin-left: 0;
    width: 100%;
  }
  .palette {
    grid-template-columns: repeat(auto-fill, minmax(11vw, 1fr));
    gap: clamp(4px, 1.2vw, 8px);
  }
  .recent button {
    width: clamp(36px, 10vw, 52px);
    height: clamp(36px, 10vw, 52px);
  }
}
@media (min-width: 721px) and (orientation: portrait) {
  .workspace {
    flex-wrap: nowrap;
    align-items: stretch;
  }
  .grid-panel,
  .palette-panel {
    flex: 1 1 0;
    min-width: 0;
    max-width: none;
    width: auto;
  }
  .paint-controls {
    flex-wrap: nowrap;
  }
}
@media (min-width: 721px) and (orientation: landscape) {
  .workspace {
    flex-wrap: nowrap;
    align-items: stretch;
    overflow: hidden;
  }
  .grid-panel {
    flex: 0 1 auto;
    width: min(42vw, 528px);
    max-width: min(42vw, 528px);
    min-width: 0;
  }
  .palette-panel {
    flex: 1 1 0;
    min-width: 0;
    width: 0;
    max-width: none;
  }
  .paint-controls {
    flex-wrap: nowrap;
  }
}
@media (hover: hover) {
  .palette button:hover { transform: scale(1.1); z-index: 1; position: relative; }