:root {
  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  --bg: #ecedef;
  --stage: #e2e3e6;
  --panel: #f7f7f8;
  --line: #d3d5da;
  --ink: #17181c;
  --ink-2: #5d616b;
  --ink-3: #8b8f99;
  --accent: #2f6df6;
  --accent-ink: #ffffff;
  --field: #ffffff;
  --handle-ring: rgba(255,255,255,.95);
  --handle-shadow: rgba(0,0,0,.35);
  --danger: #c43d3d;
  --radius: 6px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #17181b; --stage: #1e1f23; --panel: #202126; --line: #33353b;
    --ink: #eceef2; --ink-2: #a2a6b0; --ink-3: #6f737d; --accent: #5b8cff;
    --field: #2a2b31; --handle-ring: rgba(255,255,255,.9); --handle-shadow: rgba(0,0,0,.6);
    --danger: #ff6b6b; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #17181b; --stage: #1e1f23; --panel: #202126; --line: #33353b;
  --ink: #eceef2; --ink-2: #a2a6b0; --ink-3: #6f737d; --accent: #5b8cff;
  --field: #2a2b31; --handle-ring: rgba(255,255,255,.9); --handle-shadow: rgba(0,0,0,.6);
  --danger: #ff6b6b; color-scheme: dark;
}
html { scroll-padding-top: env(safe-area-inset-top, 0px); }
html, body { height: 100%; margin: 0; }
*, *::before, *::after { box-sizing: inherit; }
body {
  background: var(--bg); color: var(--ink);
  font: 14px/1.45 "Instrument Sans", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

.app { display: grid; grid-template-columns: 1fr 300px; height: 100%; }
@media (max-width: 820px) {
  body { overflow: auto; -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
  body input, body textarea { -webkit-user-select: auto; user-select: auto; -webkit-touch-callout: default; }
  .app { grid-template-columns: 1fr; grid-template-rows: minmax(52vh, auto) auto; height: auto; }
  #paletteSection { order: -1; }
  #cw, #ch { touch-action: none; }
}

/* Stage */
.stage {
  position: relative; background: var(--stage); display: grid; place-items: center;
  padding: 28px; min-height: 0; overflow: hidden; user-select: none; touch-action: none;
}
.work { display: flex; align-items: center; gap: 24px; will-change: transform; }
.ref { position: relative; flex: none; box-shadow: 0 30px 60px -20px rgba(0,0,0,.45), 0 0 0 1px rgba(0,0,0,.08); }
.ref img { display: block; width: 100%; height: 100%; object-fit: contain; user-select: none; }
.ref-x { position: absolute; top: 8px; right: 8px; width: 26px; height: 26px; padding: 0; border-radius: 50%; line-height: 1; font-size: 16px; opacity: 0; transition: opacity .12s; }
.ref:hover .ref-x { opacity: 1; }
.preview-wrap { position: absolute; top: 12px; right: 14px; z-index: 2; display: flex; align-items: center; gap: 6px; }
.preview-wrap kbd { opacity: .7; }
.zoom-chip { font-variant-numeric: tabular-nums; min-width: 48px; }
.stage.previewing .preview-wrap kbd { display: none; }
.align-row { display: flex; gap: 6px; }
.align-row .sep { width: 1px; align-self: stretch; background: var(--line); margin: 0 2px; }
.icon-btn { width: 32px; padding: 0; display: flex; align-items: center; justify-content: center; }
.icon-btn svg { display: block; }
.stage.previewing .preview-btn { border-color: var(--accent); color: var(--accent); }
.stage.previewing .stage-hint, .stage.previewing .canvas-size-tag, .stage.previewing .ref-x { display: none; }
.stage.previewing .overlay { pointer-events: none; }
.stage.sampling, .stage.sampling * { cursor: none !important; }
.stage.hard-dragging, .stage.hard-dragging * { cursor: none !important; }
.loupe { position: fixed; z-index: 50; width: 132px; height: 132px; margin: -66px 0 0 -66px; border-radius: 50%; overflow: hidden; pointer-events: none; display: none;
  border: 3px solid #fff; box-shadow: 0 0 0 1px rgba(0,0,0,.4), 0 10px 30px -6px rgba(0,0,0,.5); }
.loupe canvas { display: block; width: 100%; height: 100%; }
.loupe-hex { position: fixed; z-index: 51; transform: translate(-50%, 0); margin-top: 72px; padding: 2px 8px; border-radius: 4px; background: rgba(20,20,24,.85); color: #fff; font-size: 11px; font-variant-numeric: tabular-nums; pointer-events: none; display: none; white-space: nowrap; }
.node-menu { position: fixed; z-index: 60; min-width: 168px; padding: 6px; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 12px 28px -8px rgba(0,0,0,.4); }
.node-menu[hidden] { display: none; }
.node-menu .sep { height: 1px; margin: 4px 2px; background: var(--line); }
.node-menu button { display: flex; align-items: center; justify-content: space-between; gap: 8px; width: 100%; height: 30px; padding: 0 10px; border: none; background: none; color: var(--ink); text-align: left; border-radius: 5px; font: inherit; font-weight: 400; cursor: pointer; }
.node-menu button:hover { background: var(--field); }
.node-menu button .right { display: flex; align-items: center; gap: 6px; }
.node-menu button kbd { font-size: 10px; padding: 0 3px; }
.unlink-badge { position: absolute; z-index: 4; width: 11px; height: 11px; margin: -5.5px 0 0 -5.5px; display: none; pointer-events: none; }
.stage.dropping { outline: 2px dashed var(--accent); outline-offset: -8px; }
.stage.space-pan, .stage.space-pan * { cursor: grab !important; }
.stage.panning, .stage.panning * { cursor: grabbing !important; }
.frame { position: relative; box-shadow: 0 30px 60px -20px rgba(0,0,0,.45), 0 0 0 1px rgba(0,0,0,.08); }
.frame canvas { display: block; width: 100%; height: 100%; }
.overlay { position: absolute; inset: 0; cursor: crosshair; }
.overlay.hide-handles .handle { opacity: 0; pointer-events: none; }
.handle {
  position: absolute; z-index: 2; width: 20px; height: 20px; margin: -10px 0 0 -10px; border-radius: 50%;
  border: 2px solid #fff; box-sizing: border-box; cursor: grab; transition: transform .12s ease, box-shadow .12s ease;
  box-shadow: 0 3px 4px rgba(0,0,0,.25);
}
.handle::before { content: ''; position: absolute; top: 50%; left: 50%; width: 24px; height: 24px; transform: translate(-50%, -50%); }
.handle:hover { transform: scale(1.06); }
.handle.selected { box-shadow: 0 0 0 2px var(--accent), 0 3px 4px rgba(0,0,0,.25); }
.handle.dragging { cursor: grabbing; }
.arm { position: absolute; z-index: 1; background: #fff; pointer-events: none; display: none; height: 2px; margin-top: -1px; transform-origin: 0 50%; }
.spread-label { position: absolute; transform: translate(-50%, -100%); margin-top: -12px; padding: 2px 6px; border-radius: 4px; background: var(--panel); border: 1px solid var(--line); font-size: 11px; color: var(--ink); font-variant-numeric: tabular-nums; pointer-events: none; display: none; white-space: nowrap; }
.spread-handle { position: absolute; z-index: 3; width: 12px; height: 12px; margin: -6px 0 0 -6px; background: #fff; box-sizing: border-box; border-radius: 50%; display: none; cursor: grab; box-shadow: 0 3px 4px rgba(0,0,0,.25), inset 0 0 0 2px #fff, inset 0 3px 4px rgba(0,0,0,.2); }
.spread-handle::before { content: ''; position: absolute; top: 50%; left: 50%; width: 20px; height: 20px; transform: translate(-50%, -50%); }
.spread-handle:hover { background: #f2f2f2; }
@media (max-width: 820px) { .spread-handle { width: 20px; height: 20px; margin: -10px 0 0 -10px; } }
.hard-ring { position: absolute; display: none; overflow: visible; pointer-events: none; }
.hard-ring .grab { fill: none; stroke: transparent; stroke-width: 14px; pointer-events: stroke; cursor: none; }
.hard-ring .dots { fill: none; stroke: #fff; stroke-width: 2px; stroke-dasharray: 3 3; stroke-linecap: butt; opacity: .5; pointer-events: none; transition: opacity .1s ease-out; }
.hard-ring:hover .dots { opacity: .8; }
@property --arc-pct { syntax: '<number>'; inherits: false; initial-value: 0.1; }
.hard-ring .indicator { --arc-pct: 0.1; fill: none; stroke: #fff; stroke-width: 3px; stroke-linecap: round; opacity: 0; pointer-events: none; stroke-dasharray: calc(var(--circ, 0) * var(--arc-pct)) calc(var(--circ, 0) * (1 - var(--arc-pct))); transition: opacity .12s ease, --arc-pct .1s ease-out; transform-box: fill-box; transform-origin: center; transform: rotate(calc(var(--deg, 0) * 1deg - (180deg * var(--arc-pct)))); }
.hard-ring:hover .indicator, .hard-ring.active .indicator { opacity: 1; --arc-pct: 0.15; }
.overlay.hide-handles .arm, .overlay.hide-handles .spread-handle, .overlay.hide-handles .spread-label, .overlay.hide-handles .hard-ring { display: none !important; }
.arc-path { position: absolute; left: 0; top: 0; z-index: 1; display: none; overflow: visible; pointer-events: none; }
.arc-path path { fill: none; stroke: #fff; stroke-width: 2px; }
.overlay.hide-handles .arc-path, .overlay.hide-handles .unlink-badge { display: none !important; }
.marquee {
  position: absolute; border: 1px solid var(--accent); background: rgba(47,109,246,.12);
  pointer-events: none; display: none;
}
.stage-hint {
  position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%);
  color: var(--ink-3); font-size: 12px; white-space: nowrap; pointer-events: none;
}
.canvas-size-tag {
  position: absolute; top: 14px; left: 50%; transform: translateX(-50%);
  color: var(--ink-3); font-size: 12px; pointer-events: none;
}

/* Panel */
.panel {
  background: var(--panel); border-left: 1px solid var(--line); overflow-y: auto;
  padding: 18px 18px 28px; display: flex; flex-direction: column; gap: 22px;
}
@media (max-width: 820px) { .panel { border-left: 0; border-top: 1px solid var(--line); } }
@media (min-width: 821px) { .desktop-hide { display: none !important; } }
section h2 { font-size: 13px; font-weight: 600; color: var(--ink); margin: 0 0 10px; }
.row { display: flex; gap: 8px; align-items: center; }
.row + .row { margin-top: 8px; }
.row.wrap { flex-wrap: wrap; }
.grow { flex: 1; min-width: 0; }
.dim-field { position: relative; flex: 1; min-width: 0; }
.dim-prefix { position: absolute; left: 8px; top: 50%; transform: translateY(-50%); font-size: 12px; font-weight: 600; color: var(--ink); pointer-events: none; z-index: 1; }
.dim-prefix.scrub { pointer-events: auto; cursor: ew-resize; touch-action: none; }
body.scrubbing, body.scrubbing * { cursor: ew-resize !important; user-select: none; }
body.scrubbing { overflow: hidden !important; overscroll-behavior: none; }
input[type=number], input[type=text], select {
  width: 100%; height: 32px; padding: 0 8px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--field); color: var(--ink); font: inherit; line-height: 30px; font-variant-numeric: tabular-nums;
}
.dim-field input[type=number] { padding-left: 26px; }
input[type=number]:focus-visible, input[type=text]:focus-visible, select:focus-visible, button:focus-visible, input[type=range]:focus-visible, .handle:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}
.slider { position: relative; }
.slider-label { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); font-size: 12px; font-weight: 700; color: var(--ink); pointer-events: none; z-index: 1; }
.slider-value { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); font-size: 12px; font-weight: 700; color: var(--ink); pointer-events: none; z-index: 1; font-variant-numeric: tabular-nums; }
input[type=range] { --pct: 0%; --fill: color-mix(in srgb, var(--field), #fff 15%); -webkit-appearance: none; appearance: none; display: block; width: 100%; height: 32px; margin: 0; background: transparent; cursor: pointer; }
input[type=range]::-webkit-slider-runnable-track { height: 32px; border-radius: var(--radius); border: 1px solid var(--line); background: linear-gradient(to right, var(--fill) var(--pct), var(--field) var(--pct)); }
input[type=range]::-moz-range-track { height: 32px; border-radius: var(--radius); background: var(--field); border: 1px solid var(--line); }
input[type=range]::-moz-range-progress { height: 32px; border-radius: var(--radius) 0 0 var(--radius); background: var(--fill); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 0; height: 32px; background: transparent; border: 0; box-shadow: none; }
input[type=range]::-moz-range-thumb { width: 0; height: 32px; background: transparent; border: 0; opacity: 0; }
.checker { background-color: #fff; background-image: linear-gradient(45deg, #c8c8c8 25%, transparent 25%), linear-gradient(-45deg, #c8c8c8 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #c8c8c8 75%), linear-gradient(-45deg, transparent 75%, #c8c8c8 75%); background-size: 10px 10px; background-position: 0 0, 0 5px, 5px -5px, -5px 0; }
.swatch { position: relative; width: 34px; height: 32px; padding: 0; border: 1px solid var(--line); border-radius: var(--radius); cursor: pointer; flex: none; overflow: hidden; }
.swatch::after { content: ''; position: absolute; inset: 0; background: var(--sw, #888); }
.swatch:disabled { cursor: default; opacity: .45; }
.sv-wrap { position: relative; }
.picker-foot { display: flex; justify-content: space-between; margin-top: 8px; font-size: 12px; color: var(--ink-2); }
.picker-foot output { color: var(--ink); font-variant-numeric: tabular-nums; }
.alpha-track { position: relative; height: 14px; margin-top: 10px; border-radius: 7px; overflow: visible; touch-action: none; cursor: pointer; }
.alpha-fill { position: absolute; inset: 0; border-radius: 7px; }
.picker {
  position: absolute; top: calc(100% + 8px); left: 0; z-index: 5; padding: 10px; width: 220px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 12px 28px -8px rgba(0,0,0,.4);
}
#svCanvas { display: block; width: 220px; height: 140px; border-radius: 4px; cursor: crosshair; touch-action: none; }
.sv-thumb {
  position: absolute; width: 14px; height: 14px; margin: -7px 0 0 -7px; border-radius: 50%;
  border: 2px solid #fff; box-shadow: 0 0 0 1px rgba(0,0,0,.5), 0 1px 3px rgba(0,0,0,.4); pointer-events: none;
}
.hue-track {
  position: relative; height: 14px; margin-top: 10px; border-radius: 7px; touch-action: none; cursor: pointer;
  background: linear-gradient(to right, #f00 0%, #ff0 17%, #0f0 33%, #0ff 50%, #00f 67%, #f0f 83%, #f00 100%);
}
.hue-thumb {
  position: absolute; top: 50%; width: 16px; height: 16px; margin: -8px 0 0 -8px; border-radius: 50%;
  background: #fff; border: 1px solid rgba(0,0,0,.3); box-shadow: 0 1px 3px rgba(0,0,0,.4); pointer-events: none;
}
input[type=checkbox] { accent-color: var(--accent); width: 16px; height: 16px; margin: 0; }
button {
  height: 32px; padding: 0 12px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--field); color: var(--ink); font: inherit; font-weight: 500; cursor: pointer;
  white-space: nowrap;
}
button:hover { border-color: var(--ink-3); }
button.primary { background: #4a4d55; border-color: #4a4d55; color: #ffffff; }
button.primary:hover { filter: brightness(1.1); }
button.danger { color: var(--danger); }
button:disabled { opacity: .45; cursor: default; }
button.chip { height: 26px; padding: 0 9px; font-size: 12px; font-weight: 400; }
button.chip[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }

#selHex { font-variant-numeric: tabular-nums; text-transform: uppercase; }
.empty { color: var(--ink-3); font-size: 13px; padding: 6px 0; }

.palettes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.pal { height: 28px; border-radius: var(--radius); border: 1px solid var(--line); cursor: pointer; padding: 0; overflow: hidden; display: flex; }
.pal span { flex: 1; }
.pal:hover { border-color: var(--ink-3); }

.presets { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.preset { position: relative; aspect-ratio: 1 / 1; border-radius: var(--radius); border: 1px solid var(--line); cursor: pointer; padding: 0; background: #000; }
.preset:hover { border-color: var(--ink-3); }

.status { font-size: 12px; color: var(--ink-3); min-height: 16px; }
.status.err { color: var(--danger); }
kbd { font: inherit; font-size: 11px; color: var(--ink-2); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; background: var(--field); }
.help { font-size: 12px; color: var(--ink-3); line-height: 1.7; }
@media (prefers-reduced-motion: reduce) { .handle { transition: none; } }