:root {
  --bg: #0f0f0f;
  --panel: #1a1a1a;
  --line: #2a2a2a;
  --text: #e0e0e0;
  --dim: #777;
  --accent: #e0e0e0;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", ui-sans-serif, system-ui, sans-serif;
  font-size: 12px;
  height: 100vh;
  overflow: hidden;
}

.app { display: flex; height: 100vh; }

/* ───────── panel ───────── */
.panel {
  width: 310px;
  flex-shrink: 0;
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 18px 16px;
  overflow-y: auto;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.panel h1 { font-size: 13px; font-weight: 500; letter-spacing: 0.5px; color: var(--text); }
.panel h1 span { color: var(--dim); }

.hist-btns { display: flex; gap: 4px; }
.hist-btns button {
  background: none;
  border: 1px solid var(--line);
  color: var(--dim);
  width: 26px; height: 26px;
  border-radius: 3px;
  cursor: pointer;
  font-size: 13px;
  display: flex; align-items: center; justify-content: center;
}
.hist-btns button:hover { border-color: #444; color: var(--text); }
.hist-btns button:disabled { opacity: 0.3; cursor: default; }

section {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
section h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--dim);
  margin-bottom: 10px;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
section h2::after {
  content: '▾';
  font-size: 11px;
  transition: transform 0.2s;
  color: #444;
}
section.collapsed h2::after {
  transform: rotate(-90deg);
}
section.collapsed h2 {
  margin-bottom: 0;
}
section.collapsed > *:not(h2) {
  display: none;
}
section h3 {
  font-family: "Fragment Mono", ui-monospace, monospace;
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: #444;
  margin: 14px 0 8px;
  font-weight: 400;
}
section h3:first-child { margin-top: 0; }

label {
  display: block;
  margin-bottom: 12px;
  color: var(--dim);
  font-size: 11px;
}
label:last-child { margin-bottom: 0; }

.val { float: right; color: var(--text); }
input.val {
  width: 52px;
  margin-top: 0;
  padding: 2px 4px;
  font-size: 11px;
  text-align: right;
  background: #0d0d0d;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 3px;
  font-family: inherit;
}
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; }

/* inputs */
input[type="number"] {
  width: 100%;
  margin-top: 6px;
  background: #0d0d0d;
  border: 1px solid var(--line);
  color: var(--text);
  padding: 6px 8px;
  font-family: inherit;
  font-size: 11px;
  border-radius: 3px;
}
input:focus { outline: none; border-color: #444; }

/* sliders */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 2px;
  margin-top: 10px;
  background: var(--line);
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
}
input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px;
  border: none;
  border-radius: 50%;
  background: var(--accent);
}

/* button groups */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
}
.btn-group button {
  flex: 1;
  min-width: 0;
  background: #0d0d0d;
  border: 1px solid var(--line);
  color: var(--dim);
  padding: 6px 4px;
  font-family: inherit;
  font-size: 10px;
  border-radius: 3px;
  cursor: pointer;
  letter-spacing: 0.3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.btn-group button:hover { border-color: #444; color: var(--text); }
.btn-group button.active { background: var(--text); color: #000; border-color: var(--text); }

/* seed counter */
.seed { display: flex; gap: 6px; margin-top: 6px; }
.seed input { margin-top: 0; text-align: center; }
.seed button {
  width: 30px; flex-shrink: 0;
  background: #0d0d0d;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 3px;
  cursor: pointer;
  font-family: inherit;
}
.seed button:hover { border-color: #444; }

/* color */
input[type="color"] {
  width: 100%;
  height: 28px;
  margin-top: 6px;
  background: #0d0d0d;
  border: 1px solid var(--line);
  border-radius: 3px;
  cursor: pointer;
}

/* check label */
.check-label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 10px;
  color: var(--dim);
  margin-bottom: 0;
  cursor: pointer;
}
.check-label input[type="checkbox"] {
  width: 12px; height: 12px;
  accent-color: var(--text);
  cursor: pointer;
}

/* ───────── stage ───────── */
.stage { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.canvas-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 28px 12px;
  position: relative;
  min-height: 0;
  gap: 10px;
}

#preview {
  max-width: 100%;
  max-height: calc(100% - 40px);
  background: #000;
  cursor: grab;
  box-shadow: 0 0 0 1px var(--line);
  flex-shrink: 0;
}
#preview:active { cursor: grabbing; }

.hint {
  position: absolute;
  bottom: 52px;
  right: 28px;
  color: var(--dim);
  font-size: 9px;
  letter-spacing: 0.5px;
  pointer-events: none;
}

/* ── compare bar ── */
.compare-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  max-width: 400px;
  flex-shrink: 0;
}
.compare-label {
  font-size: 9px;
  color: var(--dim);
  letter-spacing: 0.5px;
  flex-shrink: 0;
}
.compare-bar input[type="range"] {
  flex: 1;
  margin-top: 0;
  height: 2px;
}

/* bottom bar */
.bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-top: 1px solid var(--line);
  background: var(--panel);
}
.sizes, .export { display: flex; align-items: center; gap: 8px; }

.bottom-bar button {
  background: #0d0d0d;
  border: 1px solid var(--line);
  color: var(--text);
  padding: 7px 14px;
  font-family: inherit;
  font-size: 11px;
  border-radius: 3px;
  cursor: pointer;
}
.bottom-bar button:hover { border-color: #444; }
.sizes button.active { background: var(--text); color: #000; border-color: var(--text); }
#export-png, #export-jpg { background: #222; }

.quality { display: flex; align-items: center; gap: 8px; margin: 0; color: var(--dim); white-space: nowrap; }
.quality input[type="range"] { width: 90px; margin-top: 0; }
.quality .val { float: none; }

/* ───────── sublayers ───────── */
.sublayer.hidden { display: none; }
.sublayer > *:first-child { margin-top: 10px; }

/* upload */
.upload-zone {
  position: relative;
  border: 1px dashed var(--line);
  border-radius: 3px;
  padding: 14px 10px;
  text-align: center;
  color: var(--dim);
  font-size: 10px;
  cursor: pointer;
  margin-top: 10px;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}
.upload-zone:hover, .upload-zone.drag-over { border-color: #555; color: var(--text); }
.upload-zone.has-image { border-style: solid; border-color: #444; color: var(--text); }
.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%; height: 100%;
}

#img-preview {
  display: none;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 3px;
  margin-bottom: 10px;
}

/* ───────── scatter ───────── */
#scatter-canvas {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 3px;
  cursor: crosshair;
  margin-top: 10px;
  margin-bottom: 4px;
}

.canvas-hint {
  font-size: 9px;
  color: var(--dim);
  letter-spacing: 0.3px;
  margin-bottom: 10px;
}

/* ───────── shade bands ───────── */
#dots-only.hidden, #shades-only.hidden { display: none; }
.shade-note {
  border-left: 2px solid var(--line);
  padding-left: 7px;
  margin-top: 8px;
}
#shade-bar {
  width: 100%;
  height: 34px;
  margin-top: 6px;
  border-radius: 3px;
  cursor: ew-resize;
  display: block;
}
.shade-band {
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 8px;
  margin-top: 8px;
}
.shade-band.disabled .shade-shapes,
.shade-band.disabled input[type="color"] { opacity: 0.35; pointer-events: none; }
.shade-band .shade-head {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: space-between;
}
.shade-band .shade-name {
  font-size: 10px;
  color: var(--text);
  letter-spacing: 0.3px;
}
.shade-band .shade-swatch {
  width: 14px; height: 14px;
  border-radius: 3px;
  border: 1px solid var(--line);
  flex-shrink: 0;
}
.shade-band .shade-shapes { margin-top: 6px; }
.shade-band .shade-shapes button {
  font-size: 14px;
  line-height: 1;
  padding: 5px 2px;
}
.shade-color-mount { margin-top: 6px; }
.section-disabled { opacity: 0.4; pointer-events: none; }

/* ───────── grouped color dropdown ───────── */
.cdrop { position: relative; margin-top: 6px; }
.cdrop-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  background: #0d0d0d;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 6px 8px;
  cursor: pointer;
  color: var(--text);
  font-family: inherit;
  font-size: 10px;
}
.cdrop-trigger:hover { border-color: #444; }
.cdrop-trigger.open { border-color: var(--text); }
.cdrop-sw {
  width: 14px; height: 14px;
  border-radius: 3px;
  border: 1px solid rgba(255,255,255,0.2);
  flex-shrink: 0;
}
.cdrop-name {
  flex: 1;
  text-align: left;
  letter-spacing: 0.3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.cdrop-caret { color: var(--dim); font-size: 9px; }
.cdrop-menu {
  margin-top: 4px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #0d0d0d;
  padding: 8px;
  max-height: 240px;
  overflow-y: auto;
}
.cdrop-menu.hidden { display: none; }
.cdrop-group + .cdrop-group { margin-top: 8px; }
.cdrop-group-label {
  font-size: 9px;
  color: var(--dim);
  letter-spacing: 0.4px;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.cdrop-swatches {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
}
.cdrop-opt {
  aspect-ratio: 1;
  border-radius: 3px;
  border: 1px solid var(--line);
  cursor: pointer;
  padding: 0;
  transition: transform 0.08s;
}
.cdrop-opt:hover { transform: scale(1.15); border-color: #888; }
.cdrop-opt.active { border-color: #fff; box-shadow: 0 0 0 1px #fff; }

.scatter-actions {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
}
.scatter-actions button {
  flex: 1;
  background: #0d0d0d;
  border: 1px solid var(--line);
  color: var(--dim);
  padding: 6px;
  font-family: inherit;
  font-size: 10px;
  border-radius: 3px;
  cursor: pointer;
}
.scatter-actions button:hover { border-color: #444; color: var(--text); }

#scatter-sel {
  border-top: 1px solid var(--line);
  padding-top: 10px;
  margin-top: 4px;
}
#scatter-sel.hidden { display: none; }

.btn-danger {
  width: 100%;
  background: #0d0d0d;
  border: 1px solid #3a1a1a;
  color: #a04040;
  padding: 6px;
  font-family: inherit;
  font-size: 10px;
  border-radius: 3px;
  cursor: pointer;
  margin-top: 8px;
  letter-spacing: 0.3px;
}
.btn-danger:hover { border-color: #5a2a2a; color: #c05050; }

/* ───────── xy pad ───────── */
.xy-pad-wrap {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}
#xy-pad, #warp-pad {
  display: block;
  border: 1px solid var(--line);
  border-radius: 3px;
  cursor: crosshair;
  flex-shrink: 0;
}
#xy-pad:active, #warp-pad:active { cursor: grabbing; }
.xy-vals {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 10px;
  color: var(--dim);
}
.xy-vals span span { color: var(--text); }

/* ───────── curve editor ───────── */
.curve-wrap {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}
#curve-canvas {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 3px;
  cursor: crosshair;
}
.curve-reset-btn {
  background: #0d0d0d;
  border: 1px solid var(--line);
  color: var(--dim);
  padding: 5px 12px;
  font-family: inherit;
  font-size: 10px;
  border-radius: 3px;
  cursor: pointer;
  align-self: flex-end;
}
.curve-reset-btn:hover { border-color: #444; color: var(--text); }

/* ───────── gradient ramp editor ───────── */
#grad-bar {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 3px;
  cursor: crosshair;
  margin-top: 8px;
}
#grad-sel {
  border-top: 1px solid var(--line);
  padding-top: 10px;
  margin-top: 4px;
}
#grad-sel.hidden { display: none; }

/* ───────── swatches ───────── */
.swatch-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 8px;
  width: 100%;
}
.swatch {
  display: block;
  width: 100%;
  height: 26px;
  border-radius: 3px;
  border: 1.5px solid transparent;
  cursor: pointer;
  padding: 0;
  overflow: hidden;
  background: #0d0d0d;
}
.swatch:hover { border-color: #444; }
.swatch.active { border-color: var(--text); }
.swatch-inner {
  display: grid;
  grid-template-columns: 26px 1fr;
  width: 100%;
  height: 100%;
}
.sw-dot {
  display: block;
}
.sw-label {
  font-family: inherit;
  font-size: 10px;
  letter-spacing: 0.3px;
  padding: 0 8px;
  display: flex;
  align-items: center;
  color: #fff;
}

/* ───────── warp strength label ───────── */
label.hidden { display: none; }