/* ---------------------------------------------------------------------------
   Overprint — layout & components
   Structure comes from hairlines and alignment, not from boxes and shadows.
--------------------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

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

body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--ink);
  font: 400 var(--step-1)/1.5 var(--font-ui);
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
}

h1, h2, p, dl, dd, figure { margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
svg { width: 100%; height: 100%; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }

:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }

.skip-link {
  position: fixed; top: var(--s2); left: var(--s2); z-index: 100;
  padding: var(--s2) var(--s3);
  background: var(--ink); color: var(--paper);
  font: 500 var(--step-0)/1 var(--font-mono); text-transform: uppercase; letter-spacing: var(--track);
  text-decoration: none;
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; }

/* --- Masthead ------------------------------------------------------------ */

.masthead {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--s4);
  height: var(--bar-h);
  padding: 0 var(--s5);
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky; top: 0; z-index: 20;
}

.brand { display: flex; align-items: center; gap: var(--s3); }

/* Two offset squares — a misregistered print run, which is the whole idea. */
.brand__mark { position: relative; width: 15px; height: 15px; flex: none; }
.brand__mark i {
  position: absolute; width: 11px; height: 11px; display: block;
}
.brand__mark i:first-child { top: 0; left: 0; background: var(--signal); }
.brand__mark i:last-child  { bottom: 0; right: 0; background: var(--ink); mix-blend-mode: multiply; }
:root[data-theme='dark'] .brand__mark i:last-child { mix-blend-mode: screen; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .brand__mark i:last-child { mix-blend-mode: screen; }
}

.brand__name {
  font: 400 var(--step-2)/1 var(--font-display);
  letter-spacing: -0.02em;
  text-transform: uppercase;
}
.brand__index {
  font: 500 0.5625rem/1 var(--font-mono);
  color: var(--ink-mute);
  align-self: flex-start;
  margin-left: -2px;
}
.brand__strap {
  font: 400 var(--step-0)/1 var(--font-mono);
  color: var(--ink-mute);
  letter-spacing: 0.04em;
  text-align: center;
}
.masthead__tools { display: flex; gap: var(--s1); }

.icon-btn {
  width: 32px; height: 32px; padding: 7px;
  background: transparent; border: 1px solid transparent;
  color: var(--ink-soft); cursor: pointer;
  transition: color var(--fast), border-color var(--fast);
}
.icon-btn:hover { color: var(--ink); border-color: var(--rule); }

/* --- Workspace ----------------------------------------------------------- */

.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--rail-w);
  min-height: 0;
}

/* --- Stage --------------------------------------------------------------- */

.stage { display: flex; flex-direction: column; min-width: 0; }

.stage__field {
  position: relative;
  flex: 1;
  display: grid;
  place-items: center;
  padding: var(--s6) var(--s5);
  background:
    linear-gradient(var(--rule-faint) 1px, transparent 1px) 0 0 / 100% 24px,
    linear-gradient(90deg, var(--rule-faint) 1px, transparent 1px) 0 0 / 24px 100%,
    var(--paper-sunk);
  min-height: 22rem;
  overflow: hidden;
}
.stage__field.is-dropping { background-color: var(--signal-wash); }

/* Registration marks — the crosshairs a printer trims to. */
.reg { position: absolute; width: 15px; height: 15px; opacity: 0.65; pointer-events: none; }
.reg::before, .reg::after { content: ''; position: absolute; background: var(--rule-strong); }
.reg::before { left: 50%; top: 0; bottom: 0; width: 1px; }
.reg::after  { top: 50%; left: 0; right: 0; height: 1px; }
.reg--tl { top: 16px; left: 16px; }
.reg--tr { top: 16px; right: 16px; }
.reg--bl { bottom: 16px; left: 16px; }
.reg--br { bottom: 16px; right: 16px; }

.plate { display: grid; place-items: center; max-width: 100%; }

#canvas {
  display: block;
  max-width: 100%;
  max-height: min(66vh, 40rem);
  width: auto; height: auto;
  box-shadow: var(--shadow-plate);
  touch-action: none;
}
#canvas.is-over  { cursor: grab; }
#canvas.is-drag  { cursor: grabbing; }

.placeholder { position: relative; display: grid; place-items: center; gap: var(--s2); padding: var(--s7) var(--s6); text-align: center; }
.placeholder__frame {
  position: absolute; inset: 0;
  border: 1px dashed var(--rule-strong);
}
.placeholder__lead { font: 400 var(--step-3)/1.2 var(--font-ui); color: var(--ink-soft); }
.placeholder__sub  { font-size: var(--step-1); color: var(--ink-mute); }

.linkish {
  background: none; border: 0; padding: 0; cursor: pointer;
  color: var(--ink); text-decoration: underline; text-underline-offset: 3px;
  text-decoration-color: var(--signal); text-decoration-thickness: 1px;
}
.linkish:hover { color: var(--signal); }

kbd {
  display: inline-block; min-width: 1.35em; padding: 1px 4px; margin: 0 1px;
  border: 1px solid var(--rule-strong); border-bottom-width: 2px;
  font: 500 0.6875rem/1.4 var(--font-mono); text-align: center; color: var(--ink-soft);
}

/* --- Readout strip ------------------------------------------------------- */

.readout {
  display: flex; align-items: center; flex-wrap: wrap; gap: var(--s5);
  padding: 0 var(--s5); height: 2.5rem; flex: none;
  border-top: 1px solid var(--rule);
  font: 400 var(--step-0)/1 var(--font-mono);
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  overflow: hidden;
}
.readout__cell b { color: var(--ink-mute); font-weight: 500; text-transform: uppercase; letter-spacing: var(--track); margin-right: var(--s2); }
.readout__cell--end { margin-left: auto; color: var(--ink-mute); }

/* --- Rail ---------------------------------------------------------------- */

.rail {
  border-left: 1px solid var(--rule);
  padding: var(--s5) var(--s5) var(--s7);
  display: flex; flex-direction: column; gap: var(--s6);
  overflow-y: auto;
  max-height: calc(100dvh - var(--bar-h));
  position: sticky; top: var(--bar-h);
  scrollbar-width: thin;
}

.block { display: flex; flex-direction: column; gap: var(--s3); }
.block[inert] { opacity: 0.36; }

.block__title {
  display: flex; align-items: center; gap: var(--s3);
  font: 500 var(--step-0)/1 var(--font-mono);
  text-transform: uppercase; letter-spacing: var(--track);
  color: var(--ink);
  margin-bottom: var(--s1);
}
.block__title::after { content: ''; flex: 1; height: 1px; background: var(--rule); }
.num { color: var(--signal); }

/* --- Dropzone ------------------------------------------------------------ */

.dropzone {
  display: flex; align-items: center; gap: var(--s3);
  padding: var(--s4);
  border: 1px dashed var(--rule-strong);
  color: var(--ink-soft);
  font-size: var(--step-1);
  cursor: pointer;
  transition: border-color var(--fast), background var(--fast), color var(--fast);
}
.dropzone:hover, .dropzone.is-dropping { border-color: var(--signal); color: var(--ink); background: var(--signal-wash); }
.dropzone__icon { width: 18px; height: 18px; flex: none; }

.meta {
  display: grid; grid-template-columns: auto 1fr; gap: var(--s1) var(--s4);
  font: 400 var(--step-0)/1.4 var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.meta dt { color: var(--ink-mute); text-transform: uppercase; letter-spacing: var(--track); }
.meta dd { color: var(--ink-soft); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* --- Layer list ---------------------------------------------------------- */

.layers { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule-faint); }
.layer {
  position: relative;
  display: flex; align-items: center; gap: var(--s3);
  padding: var(--s2) var(--s2) var(--s2) var(--s4);
  border-bottom: 1px solid var(--rule-faint);
  cursor: pointer;
  transition: background var(--fast);
}
.layer:hover { background: var(--rule-faint); }
.layer.is-active { background: var(--signal-wash); }
.layer.is-active::before { content: ''; position: absolute; left: 0; top: -1px; bottom: -1px; width: 2px; background: var(--signal); }
.layer__idx { font: 500 var(--step-0)/1 var(--font-mono); color: var(--ink-mute); font-variant-numeric: tabular-nums; }
.layer.is-active .layer__idx { color: var(--signal); }
.layer__text { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: var(--step-1); }
.layer__text:empty::after { content: 'Empty line'; color: var(--ink-mute); font-style: italic; }
.layers:empty { display: none; }

/* --- Controls ------------------------------------------------------------ */

.ctl { display: flex; flex-direction: column; gap: var(--s2); }
.ctl__head { display: flex; align-items: baseline; justify-content: space-between; gap: var(--s3); }
.ctl__head label, .label {
  font: 500 var(--step-0)/1 var(--font-mono);
  text-transform: uppercase; letter-spacing: var(--track);
  color: var(--ink-soft);
}
.ctl__head output, .ctl__note {
  font: 400 var(--step-0)/1 var(--font-mono);
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s4); }

.input {
  width: 100%;
  padding: var(--s2) 0;
  background: transparent;
  border: 0; border-bottom: 1px solid var(--rule-strong);
  font-size: var(--step-2);
  transition: border-color var(--fast);
}
.input:focus { outline: none; border-bottom-color: var(--signal); }
.input:focus-visible { outline: none; }
.input::placeholder { color: var(--ink-mute); }
.input--area { resize: vertical; min-height: 3.25rem; line-height: 1.4; }
.input--select {
  appearance: none;
  padding-right: var(--s5);
  background-image: linear-gradient(45deg, transparent 50%, currentColor 50%), linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position: right 8px center, right 3px center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  cursor: pointer;
}

/* Range — a hairline track with a square slug */
input[type='range'] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 14px; margin: 0;
  background: transparent; cursor: pointer;
}
input[type='range']::-webkit-slider-runnable-track { height: 1px; background: var(--rule-strong); }
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 11px; height: 11px; margin-top: -5px;
  background: var(--ink); border: 0; border-radius: 0;
  transition: background var(--fast), transform var(--fast);
}
input[type='range']:hover::-webkit-slider-thumb,
input[type='range']:focus-visible::-webkit-slider-thumb { background: var(--signal); }
input[type='range']:active::-webkit-slider-thumb { transform: scale(1.2); }
input[type='range']::-moz-range-track { height: 1px; background: var(--rule-strong); }
input[type='range']::-moz-range-thumb {
  width: 11px; height: 11px; background: var(--ink);
  border: 0; border-radius: 0; transition: background var(--fast);
}
input[type='range']:hover::-moz-range-thumb { background: var(--signal); }
input[type='range']:focus-visible { outline-offset: 6px; }

/* Segmented — hairlines produced by a 1px grid gap over a rule-colored bed */
.seg {
  display: grid; grid-auto-flow: column; grid-auto-columns: 1fr;
  gap: 1px; background: var(--rule-strong); border: 1px solid var(--rule-strong);
}
.seg--wrap { grid-auto-flow: row; grid-template-columns: 1fr 1fr; }
.seg__btn {
  padding: 7px 6px;
  background: var(--paper); color: var(--ink-soft);
  border: 0; cursor: pointer;
  font: 500 var(--step-0)/1 var(--font-mono);
  text-transform: uppercase; letter-spacing: 0.1em;
  transition: background var(--fast), color var(--fast);
}
.seg__btn:hover { color: var(--ink); background: var(--paper-raised); }
.seg__btn[aria-pressed='true'] { background: var(--ink); color: var(--paper); }
.seg__btn--icon { display: grid; place-items: center; padding: 6px; }
.seg__btn--icon svg { width: 15px; height: 15px; }
.seg__btn:focus-visible { outline-offset: -2px; }

/* Color swatches */
.swatches { display: flex; gap: var(--s5); }
.swatch { position: relative; display: inline-flex; align-items: center; gap: var(--s2); cursor: pointer; }
.swatch input { position: absolute; left: 0; top: 0; width: 20px; height: 20px; opacity: 0; cursor: pointer; }
.swatch__chip { width: 20px; height: 20px; flex: none; border: 1px solid var(--rule-strong); background: var(--paper); }
.swatch__label { font: 500 var(--step-0)/1 var(--font-mono); text-transform: uppercase; letter-spacing: var(--track); color: var(--ink-soft); }
.swatch input:focus-visible ~ .swatch__chip { outline: 2px solid var(--signal); outline-offset: 2px; }

/* Switch — square, because everything here is square */
.switch { display: flex; align-items: center; gap: var(--s3); cursor: pointer; padding: var(--s1) 0; }
.switch input { position: absolute; width: 0; height: 0; opacity: 0; }
.switch__box { position: relative; width: 32px; height: 17px; flex: none; border: 1px solid var(--rule-strong); transition: border-color var(--fast), background var(--fast); }
.switch__box::after { content: ''; position: absolute; top: 2px; left: 2px; width: 11px; height: 11px; background: var(--ink-mute); transition: transform var(--fast), background var(--fast); }
.switch input:checked + .switch__box { border-color: var(--signal); background: var(--signal-wash); }
.switch input:checked + .switch__box::after { transform: translateX(15px); background: var(--signal); }
.switch input:focus-visible + .switch__box { outline: 2px solid var(--signal); outline-offset: 3px; }
.switch__text { font-size: var(--step-1); color: var(--ink-soft); }

/* --- Buttons ------------------------------------------------------------- */

.btn {
  padding: 10px var(--s4);
  border: 1px solid var(--ink);
  background: var(--ink); color: var(--paper);
  font: 500 var(--step-0)/1 var(--font-mono);
  text-transform: uppercase; letter-spacing: var(--track);
  cursor: pointer;
  transition: background var(--fast), color var(--fast), border-color var(--fast);
}
.btn:hover { background: var(--signal); border-color: var(--signal); color: var(--signal-on); }
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--signal); border-color: var(--signal); color: var(--signal-on); }
.btn--primary:hover { background: var(--signal-deep); border-color: var(--signal-deep); }
.btn--quiet { background: transparent; color: var(--ink-soft); border-color: var(--rule-strong); }
.btn--quiet:hover { background: transparent; color: var(--signal); border-color: var(--signal); }
.btn--danger:hover { color: var(--danger); border-color: var(--danger); }
.btn:disabled { opacity: 0.35; pointer-events: none; }

.btn-row { display: flex; gap: var(--s2); }
.btn-row .btn { flex: 1; padding-inline: var(--s2); }
.actions { display: flex; flex-direction: column; gap: var(--s2); }

.colophon {
  font-size: var(--step-0); line-height: 1.6; color: var(--ink-mute);
  padding-top: var(--s4); border-top: 1px solid var(--rule);
}
.colophon code { font: 400 0.6875rem/1 var(--font-mono); color: var(--ink-soft); }

/* --- Dialog -------------------------------------------------------------- */

.sheet {
  padding: 0; border: 1px solid var(--rule-strong);
  background: var(--paper); color: var(--ink);
  max-width: 24rem; width: calc(100% - 2rem);
  box-shadow: var(--shadow-plate);
}
.sheet::backdrop { background: rgb(10 10 8 / 0.55); }
.sheet__inner { padding: var(--s5); display: flex; flex-direction: column; gap: var(--s4); }
.sheet__title { display: flex; align-items: center; gap: var(--s3); font: 500 var(--step-0)/1 var(--font-mono); text-transform: uppercase; letter-spacing: var(--track); }
.sheet__title::after { content: ''; flex: 1; height: 1px; background: var(--rule); }
.keys { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.keys li { display: flex; align-items: center; gap: var(--s2); padding: var(--s2) 0; border-bottom: 1px solid var(--rule-faint); font-size: var(--step-1); }
.keys li span:first-child { flex: 1; color: var(--ink-soft); }
.keys em { font: 400 var(--step-0)/1 var(--font-mono); color: var(--ink-mute); font-style: normal; }

/* --- Toast --------------------------------------------------------------- */

.toast {
  position: fixed; left: 50%; bottom: var(--s5); z-index: 60;
  transform: translateX(-50%);
  padding: var(--s3) var(--s4);
  background: var(--ink); color: var(--paper);
  font: 500 var(--step-0)/1 var(--font-mono); text-transform: uppercase; letter-spacing: var(--track);
  box-shadow: var(--shadow-plate);
  animation: rise var(--slow) both;
}
@keyframes rise { from { opacity: 0; transform: translate(-50%, 8px); } }

/* --- Responsive ---------------------------------------------------------- */

@media (max-width: 60rem) {
  .workspace { grid-template-columns: 1fr; }
  .rail {
    border-left: 0; border-top: 1px solid var(--rule);
    position: static; max-height: none;
    padding-inline: var(--s4);
  }
  .masthead { grid-template-columns: auto 1fr auto; padding-inline: var(--s4); }
  .brand__strap { display: none; }
  .stage__field { padding: var(--s4); min-height: 16rem; }
  #canvas { max-height: 52vh; }
  .readout {
    height: auto; min-height: 2.5rem;
    gap: var(--s2) var(--s4); padding: var(--s2) var(--s4);
  }
  .readout__cell--end { display: none; }
  .reg { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}