/* how it works: a long page in the bench's ink, figures on paper cards */

.how .top { max-width: 1240px; margin: 0 auto; }
.paper-col { max-width: 920px; margin: 0 auto; padding: 0 24px; }
.how main { padding-top: 26px; padding-bottom: 40px; }

.intro { max-width: 720px; margin: 0 0 30px; }
.intro h1 { margin: 6px 0 14px; font: 800 42px/1.05 var(--sans); letter-spacing: -0.025em; }
.lede { margin: 0; font: 500 17px/1.6 var(--sans); color: var(--ink-80); }

.how section { max-width: 720px; }
.how section p { margin: 0 0 14px; font: 500 15.5px/1.65 var(--sans); }
.how section b { font-weight: 800; }
.how h2 {
  display: flex; align-items: baseline; gap: 12px;
  margin: 56px 0 14px; font: 800 27px/1.15 var(--sans); letter-spacing: -0.02em;
}
.how h2 span {
  flex: none; display: inline-grid; place-items: center; width: 30px; height: 30px;
  border: 2px solid var(--ink); border-radius: 50%; font: 700 13px var(--mono); transform: translateY(-3px);
}

/* figures */
.how figure { margin: 22px 0 30px; }
.chart-card {
  position: relative;
  padding: 18px 20px 14px;
  background: var(--card) var(--fibre);
  border: 2px solid var(--ink); border-radius: var(--r);
  box-shadow: var(--sh);
}
.chart-host { position: relative; }
.chart { display: block; width: 100%; height: auto; overflow: visible; font-family: var(--sans); }
.chart .tick { font: 500 11px var(--mono); fill: #6f6a62; }
.chart .axis-label { font: 600 11.5px var(--sans); fill: #6f6a62; }
.chart .direct { font: 700 12px var(--sans); fill: var(--ink); paint-order: stroke; stroke: var(--card); stroke-width: 4px; stroke-linejoin: round; }
.chart .note { font: 600 11px var(--mono); fill: #6250d6; }
.chart .rowlabel { font: 600 12.5px var(--sans); fill: var(--ink); }
.chart .mark { outline: none; cursor: default; }
.chart .mark:focus-visible circle { stroke: var(--ink); }
.multiple + .multiple { margin-top: 6px; }
.legend { display: flex; flex-wrap: wrap; gap: 16px; margin: 0 0 6px; font: 600 12px var(--sans); color: var(--ink-80); }
.legend span { display: inline-flex; align-items: center; gap: 7px; }
.legend i { display: inline-block; width: 16px; height: 2px; border-radius: 1px; background: var(--c); }
.legend i.dot { width: 9px; height: 9px; border-radius: 50%; }
.legend i.bar { width: 16px; height: 9px; border-radius: 3px; opacity: 0.7; }
.tip {
  position: absolute; z-index: 3; min-width: 150px; padding: 8px 10px;
  background: var(--card); border: 1.5px solid var(--ink); border-radius: 6px; box-shadow: 2px 2px 0 var(--ink-35);
  font: 500 12px/1.5 var(--sans); color: var(--ink-80); pointer-events: none;
}
.tip .tip-head { font: 600 11px var(--mono); color: var(--ink-60); margin-bottom: 3px; }
.tip div { display: flex; align-items: center; gap: 6px; }
.tip i { display: inline-block; width: 12px; height: 2px; background: var(--c); }
.tip b { font: 700 13px var(--sans); color: var(--ink); }
.how figcaption { margin-top: 10px; font: 500 13.5px/1.55 var(--sans); color: var(--ink-80); }
.fig { font: 600 11px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-60); margin-right: 6px; }
.how details { margin-top: 10px; font: 500 12.5px var(--sans); }
.how summary { cursor: pointer; font: 600 11.5px var(--mono); color: var(--ink-60); letter-spacing: 0.04em; }
.how details table { margin-top: 8px; border-collapse: collapse; font: 500 12px var(--mono); }
.how details td, .how details th { padding: 3px 14px 3px 0; text-align: left; border-bottom: 1px solid #e6e1d6; }
.how details th { font-weight: 600; color: var(--ink-60); }

/* colour swatches */
.swatches { display: grid; gap: 6px; }
.swatch-row { display: grid; grid-template-columns: 170px repeat(10, minmax(0, 1fr)); gap: 4px; align-items: center; }
.swatch-row i { display: block; height: 46px; border-radius: 3px; box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.06); }
.swatch-row.de b { font: 600 11.5px var(--mono); text-align: center; color: var(--ink-60); }
.swatch-label { font: 600 12.5px var(--sans); color: var(--ink-80); }

/* drag to compare: the original under, the simulator clipped over it */
.compare { margin: 26px 0 34px; }
.compare-row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; margin: 26px 0 8px; }
.compare-row .compare { margin: 0 0 26px; }
.wipe {
  --x: 50%;
  position: relative; overflow: hidden; touch-action: pan-y;
  border: 2px solid var(--ink); border-radius: 6px; box-shadow: 4px 4px 0 var(--ink);
  background: #6b4a2f; line-height: 0;
}
.wipe img { display: block; width: 100%; height: auto; }
.wipe .over { position: absolute; inset: 0; clip-path: inset(0 0 0 var(--x)); }
.wipe .over img { width: 100%; height: 100%; object-fit: cover; }
.wipe .bar { position: absolute; top: 0; bottom: 0; left: var(--x); width: 2px; margin-left: -1px; background: #f4f1ea; box-shadow: 0 0 0 1px rgba(34, 56, 94, 0.5); pointer-events: none; }
.wipe .bar::after {
  content: '⇆'; position: absolute; top: 50%; left: 50%; width: 34px; height: 34px; margin: -17px 0 0 -17px;
  display: grid; place-items: center; border: 2px solid var(--ink); border-radius: 50%;
  background: var(--card); color: var(--ink); font: 700 15px/1 var(--sans); box-shadow: 2px 2px 0 var(--ink);
}
.wipe input { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: ew-resize; }
.wipe:has(input:focus-visible) .bar::after { outline: 3px solid var(--ink); outline-offset: 2px; }
.wipe .lab {
  position: absolute; top: 10px; padding: 3px 8px; line-height: 1.3;
  background: var(--card); border: 1.5px solid var(--ink); border-radius: 5px;
  font: 600 11px var(--mono); color: var(--ink); pointer-events: none;
}
.wipe .la { left: 10px; }
.wipe .lb { right: 10px; }
.hint-line { font: 600 12px var(--mono) !important; color: var(--ink-60); }

.pair, .trio { display: grid; gap: 14px; margin: 22px 0 30px; }
.pair { grid-template-columns: repeat(2, 1fr); }
.trio { grid-template-columns: repeat(3, 1fr); }
.pair > div, .trio > div { display: grid; gap: 8px; }
.pair img, .trio img { display: block; width: 100%; height: auto; border: 2px solid var(--ink); border-radius: 6px; box-shadow: 3px 3px 0 var(--ink); }
.pair span, .trio span { font: 600 11.5px var(--mono); color: var(--ink-60); }
.pair figcaption, .trio figcaption { grid-column: 1 / -1; }

/* stages and photos */
.wide { margin-left: -60px !important; margin-right: -60px !important; }
.stage-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stage-row div { display: grid; gap: 8px; }
.stage-row img, .photo img { display: block; width: 100%; height: auto; border: 2px solid var(--ink); border-radius: 6px; box-shadow: 3px 3px 0 var(--ink); background: #6b4a2f; }
.stage-row span { font: 600 11.5px var(--mono); color: var(--ink-60); }

.methods ul { margin: 0 0 14px; padding-left: 18px; display: grid; gap: 8px; font: 500 14.5px/1.6 var(--sans); }
.sources { font-size: 13px !important; color: var(--ink-80); }
.how .foot { max-width: 920px; margin: 0 auto; padding: 26px 24px 40px; font-size: 12px; }

@media (max-width: 1060px) { .wide { margin-left: 0 !important; margin-right: 0 !important; } }
@media (max-width: 700px) {
  .paper-col { padding: 0 14px; }
  .intro h1 { font-size: 31px; }
  .lede { font-size: 15.5px; }
  .how h2 { font-size: 22px; margin-top: 42px; }
  .chart-card { padding: 14px 12px 10px; }
  .stage-row { grid-template-columns: repeat(2, 1fr); }
  .trio { grid-template-columns: 1fr 1fr; }
  .compare-row { grid-template-columns: 1fr; gap: 0; }
  .wipe .lab { top: 6px; font-size: 10px; }
  .swatch-row { grid-template-columns: 92px repeat(10, minmax(0, 1fr)); gap: 2px; }
  .swatch-row i { height: 34px; }
  .swatch-label { font-size: 11px; }
}