:root {
  color-scheme: dark;
  --bg: oklch(17.7% .004 270); --paper: oklch(17.7% .004 270);
  --surface: oklch(23.4% .008 275); --raised: oklch(29.8% .01 275);
  --text: oklch(96% .004 275); --muted: oklch(73% .013 275); --border: oklch(33% .013 275);
  --dot: oklch(72% .015 275); --guide: oklch(72% .015 275);
  --accent: oklch(79% .12 250); --selected: oklch(87% .07 250); --selected-ink: oklch(27% .08 250);
  --glass-surface: oklch(23% .008 260 / .50); --glass-sheet: oklch(23% .008 260 / .86);
  --glass-border: oklch(100% 0 0 / .13); --glass-highlight: oklch(100% 0 0 / .11);
  --glass-shadow: oklch(0% 0 0 / .22); --control-hover: oklch(100% 0 0 / .1);
  --tool-selected: oklch(74% .12 250 / .19); --tool-edge: oklch(84% .09 250 / .18);
  --control-size: 34px;
  --danger: oklch(79% .13 15); --overlay: oklch(0% 0 0 / .5);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px; line-height: 1.45; color: var(--text); background: var(--bg);
  font-synthesis: none; text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased;
}
:root[data-theme="light"] {
  color-scheme: light; --bg: oklch(95% .008 90); --paper: oklch(99% .004 90);
  --surface: oklch(100% 0 0); --raised: oklch(94% .007 90); --text: oklch(28% .008 275);
  --muted: oklch(52% .018 275); --border: oklch(86% .007 90); --dot: oklch(55% .015 275);
  --guide: oklch(53% .015 275); --accent: oklch(48% .19 255); --selected: oklch(50% .19 255);
  --glass-surface: oklch(100% 0 0 / .44); --glass-sheet: oklch(100% 0 0 / .86);
  --glass-border: oklch(100% 0 0 / .8); --glass-highlight: oklch(100% 0 0 / .94);
  --glass-shadow: oklch(25% .025 260 / .12); --control-hover: oklch(100% 0 0 / .64);
  --tool-selected: oklch(74% .12 250 / .19); --tool-edge: oklch(62% .16 250 / .14);
  --selected-ink: oklch(100% 0 0); --danger: oklch(49% .17 15); --overlay: oklch(0% 0 0 / .3);
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; overscroll-behavior: none; }
button, input, select { font: inherit; color: inherit; touch-action: manipulation; }
button { border: 0; background: transparent; display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 13px; border-radius: 11px; cursor: pointer; white-space: nowrap; }
button:hover:not(:disabled) { background: var(--raised); }
button:disabled { opacity: .3; cursor: default; }
button, input, select, .drawing-canvas { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
button svg { display: block; flex: 0 0 auto; }
[data-icon] { display: inline-flex; align-items: center; justify-content: center; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
#app, #app * { user-select: none; -webkit-user-select: none; -webkit-touch-callout: none; }
#app { position: relative; height: 100vh; height: 100dvh; background: var(--paper); }
.document-picker { color: var(--text); padding: 0 12px; min-width: 0; }
.document-picker>span:first-child { max-width: 144px; overflow: hidden; text-overflow: ellipsis; }
.document-picker svg { width: 13px; }
.icon-button { width: 44px; padding: 0; flex-shrink: 0; }
.workspace { position: absolute; inset: 0; overflow: hidden; }
.drawing-canvas { display: block; width: 100%; height: 100%; touch-action: none; user-select: none; -webkit-user-select: none; -webkit-touch-callout: none; cursor: crosshair; }
.drawing-canvas:focus, .drawing-canvas:focus-visible { outline: none; }
#guide-grid { stroke: var(--guide); stroke-width: .7; fill: none; }
#dot-grid { fill: var(--dot); }
.art-layer { fill: none; stroke-linecap: round; stroke-linejoin: round; }
.drawing-canvas[data-mode="erase"] .art-layer line { stroke: var(--danger); }
.feedback-layer, .keyboard-layer { pointer-events: none; }
.floating-tools { position: fixed; top: 50%; right: max(14px, env(safe-area-inset-right)); transform: translateY(-50%); display: flex; flex-direction: column; align-items: center; gap: 8px; pointer-events: none; }
.floating-tools>* { pointer-events: auto; }
.tool-switch { display: flex; gap: 2px; }
.tool-switch button { color: var(--text); width: var(--control-size); padding: 0; }
.tool-switch button[aria-pressed="true"] { background: var(--tool-selected); color: var(--accent); box-shadow: inset 0 0 0 1px var(--tool-edge); }
.history-controls { display: flex; flex-direction: column; gap: 2px; }
.share-controls { display: flex; }
.history-controls button { color: var(--text); }
.app-footer { position: absolute; bottom: max(12px, env(safe-area-inset-bottom)); left: max(16px, env(safe-area-inset-left)); right: max(16px, env(safe-area-inset-right)); margin: 0 auto; width: max-content; max-width: calc(100% - 32px); display: flex; align-items: center; gap: 2px; }
.grid-picker { padding: 0 10px; min-width: var(--control-size); }
.export-button { color: var(--accent); padding: 0 10px; }
.error-banner { position: absolute; left: 50%; top: 74px; transform: translateX(-50%); width: max-content; max-width: calc(100% - 32px); padding: 8px 8px 8px 16px; border: 1px solid var(--danger); border-radius: 13px; display: flex; align-items: center; gap: 12px; background: var(--surface); color: var(--danger); z-index: 3; }
.sheet { width: 420px; max-width: calc(100% - 32px); max-height: calc(100dvh - 48px); margin: auto 24px auto auto; padding: 19px 23px 24px; border: 1px solid var(--border); border-radius: 22px; background: var(--surface); color: var(--text); overflow: auto; overscroll-behavior: contain; box-shadow: 0 22px 65px oklch(0% 0 0 / .18); }
.sheet::backdrop { background: var(--overlay); }
.sheet-header { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 16px; }
.sheet h2 { font-size: 18px; line-height: 1.3; margin: 0; font-weight: 550; letter-spacing: -.3px; }
.sheet h3 { font-size: 12px; text-transform: uppercase; letter-spacing: 1px; margin: 22px 0 13px; color: var(--muted); font-weight: 500; }
.field { display: block; margin: 15px 0; }.field-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 7px; }
output { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
input[type="range"] { display: block; width: 100%; margin: 0; min-height: 30px; accent-color: var(--accent); }
input[type="text"], input[type="number"], select { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg); }
input[type="color"] { width: 44px; height: 44px; padding: 3px; border: 1px solid var(--border); background: var(--raised); border-radius: 10px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin: 14px 0; }.row select { width: auto; max-width: 65%; }
.columns { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }.columns>* { min-width: 0; }
.choice { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }.choice button { border: 1px solid var(--border); min-height: 53px; }
.choice button[aria-pressed="true"] { background: var(--selected); color: var(--selected-ink); border-color: transparent; }
.divider { height: 1px; background: var(--border); margin: 21px 0; }
.note { font-size: 12px; line-height: 1.55; color: var(--muted); margin: 12px 0; }
.panel-error { color: var(--danger); font-size: 13px; margin: 12px 0; }
.primary { background: var(--selected); color: var(--selected-ink); width: 100%; margin-top: 12px; }
.primary:hover:not(:disabled) { background: var(--selected); filter: brightness(.94); }
.secondary { background: var(--raised); }.danger { color: var(--danger); }
.wide-button { width: 100%; justify-content: space-between; padding: 12px; min-height: 52px; background: var(--raised); margin-top: 8px; text-align: left; }
.actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 6px; margin-top: 20px; }
.actions .primary { width: auto; margin: 0; }.actions button { padding: 0 15px; }
.saved-row { display: flex; align-items: center; gap: 8px; margin: 8px 0; }.saved-row .wide-button { flex: 1; min-width: 0; margin: 0; }
.saved-label { display: flex; flex-direction: column; gap: 4px; min-width: 0; }.saved-label>span:first-child { overflow: hidden; text-overflow: ellipsis; }
.saved-meta { color: var(--muted); font-size: 12px; }.saved-thumb { width: 50px; height: 56px; object-fit: contain; flex-shrink: 0; }
.export-preview { width: 100%; height: 210px; display: block; object-fit: contain; border-radius: 13px; border: 1px solid var(--border); background: repeating-conic-gradient(oklch(92% 0 0) 0% 25%, oklch(84% 0 0) 0% 50%) 50% / 16px 16px; }
.check { display: flex; gap: 9px; align-items: center; min-height: 44px; }.check input { width: 18px; height: 18px; accent-color: var(--accent); }
.empty-documents { padding: 18px 0; color: var(--muted); }
details { margin: 20px 0 0; }summary { cursor: pointer; min-height: 44px; display: flex; align-items: center; justify-content: space-between; }summary::after { content: '+'; font-size: 18px; color: var(--muted); }details[open] summary::after { content: '−'; }
@media (max-width: 640px) {
  :root { --control-size: 40px; }
  .floating-tools { right: max(12px, env(safe-area-inset-right)); }.history-controls { gap: 0; }
  .app-footer { max-width: calc(100% - 20px); left: max(10px, env(safe-area-inset-left)); right: max(10px, env(safe-area-inset-right)); bottom: max(12px, env(safe-area-inset-bottom)); gap: 1px; }
  .optional-label { display: none; }.grid-picker,.export-button { width: var(--control-size); padding: 0; flex-shrink: 0; }
  .document-picker { flex: 1 1 auto; padding: 0 8px; }.document-picker>span:first-child { max-width: 112px; }
  .sheet { width: 100%; max-width: 100%; max-height: 88dvh; margin: auto 0 0; border-radius: 23px 23px 0 0; padding: 16px 22px max(22px, env(safe-area-inset-bottom)); border-bottom: 0; }
  input, select, textarea { font-size: 16px; }
}
@media (max-width: 374px) {
  .document-picker>span:first-child { max-width: 68px; }.floating-tools { right: max(10px, env(safe-area-inset-right)); }
}
@media (prefers-reduced-motion: no-preference) { button { transition: background-color .12s, color .12s; } }
@media (pointer: coarse) { input, select, textarea { font-size: 16px; } }

/* Compact floating glass; the drawing remains visible beneath the controls. */
.tool-switch, .history-controls, .share-controls, .app-footer {
  padding: 2px; border: 1px solid var(--glass-border); border-radius: 999px;
  background: var(--surface);
  box-shadow: inset 0 1px 0 var(--glass-highlight), 0 4px 16px var(--glass-shadow), 0 0 0 .5px var(--glass-shadow);
}
.floating-tools button, .app-footer button {
  min-height: var(--control-size); border-radius: 999px; gap: 6px; font-size: 13px;
}
.floating-tools .icon-button, .app-footer .icon-button { width: var(--control-size); }
.floating-tools button:hover:not(:disabled):not([aria-pressed="true"]), .app-footer button:hover { background: var(--control-hover); }
.floating-tools button:active:not(:disabled), .app-footer button:active { background: var(--tool-selected); }
.sheet { --glass-surface: var(--glass-sheet); }
@supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .tool-switch, .history-controls, .share-controls, .app-footer, .sheet {
    background: var(--glass-surface);
    -webkit-backdrop-filter: blur(22px) saturate(165%);
    backdrop-filter: blur(22px) saturate(165%);
  }
}
@media (pointer: coarse) { :root { --control-size: 40px; } }
@media (prefers-reduced-transparency: reduce) {
  .tool-switch, .history-controls, .share-controls, .app-footer, .sheet {
    background: var(--surface); -webkit-backdrop-filter: none; backdrop-filter: none;
    border-color: var(--border);
  }
}
@media (forced-colors: active) {
  .tool-switch, .history-controls, .share-controls, .app-footer, .sheet {
    background: Canvas; border-color: ButtonText; box-shadow: none;
    -webkit-backdrop-filter: none; backdrop-filter: none;
  }
  .tool-switch button[aria-pressed="true"] { outline: 2px solid Highlight; outline-offset: -3px; }
}