/* BNNX demo. System fonts only (the page must load nothing from outside). */
:root {
  --desk: #1e2127;
  --desk-raised: #272b33;
  --desk-text: #d9dce1;
  --desk-muted: #9aa1ab;
  --paper: #f4f4f1;
  --ink: #17191e;
  --ink-muted: #5d636d;
  --rule: #d6d7d2;
  --stamp: #2b4acb;
  --alert: #c23b22;
  --bit-off: #e4e5e0;
  --stamp-light: #8fb4ff;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius: 3px;
}

* { box-sizing: border-box; }

html { background: var(--desk); }

body {
  margin: 0;
  background: var(--desk);
  color: var(--desk-text);
  font: 16px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}

code, pre { font-family: var(--mono); }

a { color: inherit; text-underline-offset: 3px; }

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

/* focus ring on the dark desk: stamp blue has 2.0-2.3:1 (WCAG wants 3:1), light blue 6.9-7.8:1 */
.masthead :focus-visible, .facts :focus-visible, .colophon :focus-visible { outline-color: var(--stamp-light); }

/* ------------------------------------------------------------------ masthead */
.masthead {
  max-width: 1080px;
  margin: 0 auto;
  padding: 56px 24px 32px;
}

.eyebrow {
  margin: 0 0 18px;
  font: 600 12px/1 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--desk-muted);
}

.masthead h1 {
  margin: 0;
  max-width: 17ch;
  font: 700 clamp(32px, 5.2vw, 56px)/1.05 var(--mono);
  letter-spacing: -0.035em;
  color: #fff;
}

.masthead h1 code {
  font-weight: 400;
  color: var(--desk-muted);
}

.lede {
  max-width: 62ch;
  margin: 20px 0 0;
  color: var(--desk-muted);
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ------------------------------------------------------------------ benches */
.bench {
  margin: 0 0 28px;
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
}

.bench-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--rule);
}

.bench-head h2 {
  margin: 0;
  font: 700 20px/1.2 var(--mono);
  letter-spacing: -0.01em;
}

.spec {
  margin: 0;
  font: 12px/1.4 var(--mono);
  color: var(--ink-muted);
}

.bench-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.input { padding: 24px; border-right: 1px solid var(--rule); }

.output { padding: 24px; min-height: 280px; }

.pads {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: flex-start;
}

figure { margin: 0; }

figcaption {
  margin-top: 8px;
  max-width: 280px;
  font: 12px/1.4 var(--mono);
  color: var(--ink-muted);
}

.pad {
  display: block;
  width: 280px;
  max-width: 100%;
  aspect-ratio: 1;
  background: #000;
  border-radius: var(--radius);
  touch-action: none;
  cursor: crosshair;
}

.pixelated { image-rendering: pixelated; cursor: default; }

.bits {
  display: block;
  width: 197px;
  height: 197px;
}

.mirror-frame figcaption { max-width: 197px; }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

button, .upload span {
  appearance: none;
  padding: 9px 14px;
  font: 600 14px/1 var(--sans);
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  cursor: pointer;
}

button.primary { color: var(--paper); background: var(--ink); }

button:hover, .upload span:hover { background: var(--ink); color: var(--paper); }

button.primary:hover { background: var(--stamp); border-color: var(--stamp); }

button:disabled { opacity: 0.45; cursor: progress; }

/* photo picker */
.picker { flex: 1 1 180px; min-width: 0; }

.picker-label {
  margin: 0 0 8px;
  font: 600 12px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.thumbs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
  gap: 6px;
}

.thumb {
  padding: 0;
  border: 2px solid transparent;
  border-radius: 2px;
  background: none;
  line-height: 0;
}

.thumb canvas { width: 100%; aspect-ratio: 1; image-rendering: pixelated; border-radius: 1px; }

.thumb[aria-pressed="true"] { border-color: var(--stamp); }

.thumb:hover { background: none; border-color: var(--ink); }

.upload { display: inline-block; margin-top: 14px; }

.upload input { position: absolute; width: 1px; height: 1px; opacity: 0; }

.upload input:focus-visible + span { outline: 2px solid var(--stamp); outline-offset: 2px; }

.hint { margin: 10px 0 0; font-size: 13px; color: var(--ink-muted); }

/* ------------------------------------------------------------------ results */
.placeholder { margin: 0; color: var(--ink-muted); }

.status { margin: 0; font: 13px/1.5 var(--mono); color: var(--ink-muted); }

.status.error { color: var(--alert); }

.verdict {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-bottom: 14px;
}

.verdict-label {
  font: 600 12px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.verdict-value { font: 700 44px/1 var(--mono); letter-spacing: -0.03em; }

.verdict-note { flex-basis: 100%; font-size: 13px; color: var(--ink-muted); }

.stamps { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }

.stamp {
  display: inline-block;
  padding: 5px 9px 4px;
  font: 700 11px/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--stamp);
  border: 1.5px solid currentColor;
  border-radius: 2px;
  transform: rotate(-1.5deg);
}

.stamp.bad { color: var(--alert); }

.stamp.quiet { color: var(--ink-muted); transform: none; }

/* the diff: one row per class, both nodes side by side */
.diff-wrap { overflow-x: auto; }

.diff {
  width: 100%;
  border-collapse: collapse;
  font: 13px/1.2 var(--mono);
  font-variant-numeric: tabular-nums;
}

.diff th {
  padding: 0 6px 8px;
  font-weight: 600;
  font-size: 11px;
  text-align: right;
  color: var(--ink-muted);
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}

.diff th:first-child, .diff td:first-child { text-align: left; }

.diff td { padding: 5px 6px; text-align: right; border-bottom: 1px dashed var(--rule); }

.diff td.eq { color: var(--stamp); text-align: center; width: 1.5em; }

.diff td.ne { color: var(--alert); text-align: center; width: 1.5em; font-weight: 700; }

.diff td.na { width: 1.5em; }

.diff tr.top td { font-weight: 700; }

.diff td.bar { width: 34%; padding-left: 10px; }

.bar span {
  display: block;
  height: 8px;
  background: var(--ink);
  border-radius: 1px;
  min-width: 1px;
}

.diff tr.top .bar span { background: var(--stamp); }

.node-error { color: var(--alert); font-size: 12px; text-align: left; }

.print { animation: print 320ms ease-out; }

@keyframes print {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* ------------------------------------------------------------------ facts */
.facts { margin: 44px 0 0; color: var(--desk-text); }

.facts h2 {
  margin: 0 0 18px;
  font: 700 20px/1.2 var(--mono);
  color: #fff;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
}

.fact {
  padding: 18px 20px;
  background: var(--desk-raised);
  border-radius: var(--radius);
}

.fact h3 { margin: 0 0 12px; font: 700 15px/1.2 var(--mono); color: #fff; }

.fact dl { margin: 0; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 7px 14px; }

.fact dt { font: 12px/1.5 var(--mono); color: var(--desk-muted); }

.fact dd { margin: 0; font: 12px/1.5 var(--mono); overflow-wrap: anywhere; }

.check-ok { color: var(--stamp-light); }

.check-bad { color: #ff9a85; }

.howto { margin-top: 28px; max-width: 76ch; }

.howto h3 { margin: 0 0 8px; font: 700 15px/1.2 var(--mono); color: #fff; }

.howto p { color: var(--desk-muted); }

.howto pre {
  margin: 12px 0;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 12px;
  background: var(--desk-raised);
  border-radius: var(--radius);
  color: var(--desk-text);
}

.colophon {
  max-width: 1080px;
  margin: 40px auto 0;
  padding: 24px 24px 48px;
  font-size: 13px;
  color: var(--desk-muted);
  border-top: 1px solid var(--desk-raised);
}

/* ------------------------------------------------------------------ small screens, motion */
@media (max-width: 820px) {
  .bench-body { grid-template-columns: minmax(0, 1fr); }
  .input { border-right: 0; border-bottom: 1px solid var(--rule); }
  .masthead { padding-top: 40px; }
}

@media (max-width: 480px) {
  .masthead, main, .colophon { padding-left: 16px; padding-right: 16px; }
  .input, .output, .bench-head { padding-left: 16px; padding-right: 16px; }
  .diff .bar { display: none; }
  .diff th { white-space: normal; }
  .diff th, .diff td { padding-left: 4px; padding-right: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  .print { animation: none; }
  .stamp { transform: none; }
}