*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--c-bg); color: var(--c-fg);
  font: 400 var(--fs-md)/var(--lh) var(--f-sans);
  font-feature-settings: "tnum" 1, "lnum" 1;
}
a { color: var(--c-accent-text); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--c-ring); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--c-card); padding: var(--sp-2) var(--sp-3); z-index: 10; }
.skip:focus { left: 8px; }
.nw { white-space: nowrap; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.cap::first-letter { text-transform: uppercase; }
.cap { display: inline-block; }

/* ---- shell ---------------------------------------------------------------- */
.top { background: var(--c-card); border-bottom: 1px solid var(--c-line); }
.top__in { max-width: var(--wrap); margin: 0 auto; padding: var(--sp-1) var(--sp-4); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0 var(--sp-4); }
.brand { display: inline-flex; align-items: center; gap: var(--sp-2); min-height: var(--hit); color: var(--c-fg); text-decoration: none; letter-spacing: -.01em; font-size: var(--fs-lg); }
.brand__mark { width: 28px; height: 28px; flex: none; }
.mk-joint { fill: var(--c-line); }
.mk-tile { fill: var(--c-fg); }
.mk-glaze { fill: var(--c-accent); }
/* The wordmark's three words, apart by colour and weight: tile in ink, grout in the glaze, calc quiet. */
.bw--1 { font-weight: 800; color: var(--c-fg); }
.bw--2 { font-weight: 800; color: var(--c-accent-text); }
.bw--3 { font-weight: 500; color: var(--c-fg-2); }
.nav ul { list-style: none; margin: 0 calc(-1 * var(--sp-2)) 0 0; padding: 0; display: flex; flex-wrap: wrap; }
.nav a { display: inline-flex; align-items: center; min-height: var(--hit); padding: 0 var(--sp-2); color: var(--c-fg); font-size: var(--fs-sm); font-weight: 600; text-decoration: none; border-radius: var(--r-tile); }
.nav a:hover { background: var(--c-row); }
.nav a[aria-current="page"] { color: var(--c-accent-text); box-shadow: inset 0 -2px 0 var(--c-accent); border-radius: 0; }

.crumbs { max-width: var(--wrap); margin: 0 auto; padding: var(--sp-2) var(--sp-4) 0; font-size: var(--fs-xs); color: var(--c-fg-2); }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0 var(--sp-2); }
.crumbs li + li::before { content: "/"; margin-right: var(--sp-2); color: var(--c-line); }
.crumbs a { color: var(--c-fg-2); display: inline-flex; align-items: center; min-height: 32px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--sp-4) var(--sp-7); }
.h1 { font-size: var(--fs-h1); line-height: 1.15; letter-spacing: -.02em; font-weight: 800; margin: var(--sp-3) 0 var(--sp-4); display: flex; align-items: center; gap: var(--sp-3); }
.h2 { font-size: var(--fs-lg); line-height: 1.3; font-weight: 700; letter-spacing: -.01em; margin: 0 0 var(--sp-3); display: flex; align-items: center; gap: var(--sp-2) var(--sp-3); }
/* A heading runs out into a row of tile edges on their joints, the last tile the spare in the glaze. */
.h2:not(.h2--quiet)::after {
  content: ""; flex: 1 1 2.5rem; min-width: 2.5rem; height: 8px; border-radius: 2px;
  background:
    linear-gradient(90deg, transparent calc(100% - 16px), var(--c-accent) calc(100% - 16px)),
    repeating-linear-gradient(90deg, var(--c-tile) 0 16px, var(--c-grout) 16px 19px);
  box-shadow: inset 0 -1px 0 var(--c-tile-edge);
}
.h2--quiet { font-size: var(--fs-sm); color: var(--c-fg-2); display: block; }
.sect { margin-top: var(--sp-6); }

/* ---- the floor and the glazed answer tile -------------------------------- */
/* The answer sits on a tiled floor: the ground is a joint grid, the card a glazed tile over it. */
.floor {
  margin: 0 calc(-1 * var(--sp-4)); padding: var(--sp-4);
  background-color: var(--c-bg);
  background-image:
    linear-gradient(var(--c-grout) 2px, transparent 2px),
    linear-gradient(90deg, var(--c-grout) 2px, transparent 2px);
  background-size: var(--grid) var(--grid);
  background-position: -1px -1px;
}
.answer {
  position: relative; overflow: hidden; isolation: isolate;
  border-radius: var(--r-card);
  background: linear-gradient(165deg, var(--c-glaze-hi), var(--c-glaze-lo));
  -webkit-backdrop-filter: blur(3px) saturate(1.1); backdrop-filter: blur(3px) saturate(1.1);
  border: 1px solid var(--c-glaze-edge);
  box-shadow: inset 0 1px 0 var(--c-glaze-edge), var(--shadow-2);
  padding: var(--sp-5) var(--sp-5) var(--sp-4);
}
.answer::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: linear-gradient(115deg, transparent 30%, var(--gloss) 44%, transparent 58%);
  transform: translateX(-60%);
  animation: sheen var(--t-sheen) var(--ease-out) 200ms 1 both;
}
@keyframes sheen { from { transform: translateX(-60%); } to { transform: translateX(60%); } }
.answer__ctx { margin: 0; font-size: var(--fs-sm); font-weight: 600; color: var(--c-fg-2); }
.answer__dims { margin: 2px 0 0; font-size: var(--fs-xs); color: var(--c-fg-2); }
.answer__num { margin: var(--sp-1) 0 0; display: flex; align-items: baseline; flex-wrap: wrap; gap: 0 var(--sp-2); font-size: var(--fs-lg); font-weight: 700; }
.answer__num b { font-size: var(--fs-answer); line-height: 1; font-weight: 800; letter-spacing: -.04em; }
.answer__num--range b { font-size: var(--fs-answer-2); letter-spacing: -.03em; }
.answer__verb { flex-basis: 100%; font-size: var(--fs-xs); font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--c-accent-text); }
.answer__sub { margin: var(--sp-1) 0 0; color: var(--c-fg-2); font-size: var(--fs-sm); }
.answer__rows { margin: var(--sp-4) 0 0; padding: var(--sp-3) 0 0; border-top: 1px solid var(--c-line); display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); gap: var(--sp-3) var(--sp-4); }
.answer__rows div { min-width: 0; }
.answer__rows dt { font-size: var(--fs-xs); font-weight: 600; color: var(--c-fg-2); text-transform: uppercase; letter-spacing: .06em; }
.answer__rows dd { margin: 2px 0 0; font-size: var(--fs-lg); font-weight: 700; }
.answer__rows dd small { font-size: var(--fs-xs); font-weight: 500; color: var(--c-fg-2); display: block; }
.answer__buy dd { color: var(--c-accent-text); }
.answer__list { list-style: none; margin: var(--sp-3) 0 0; padding: 0; display: grid; gap: var(--sp-3); }
.answer__list li + li { border-top: 1px solid var(--c-line); padding-top: var(--sp-3); }
.answer__prod { display: block; font-weight: 700; }
.answer__line { display: flex; align-items: baseline; gap: var(--sp-2); font-size: var(--fs-lg); font-weight: 700; }
.answer__line b { font-size: var(--fs-answer-2); line-height: 1.05; font-weight: 800; letter-spacing: -.03em; }
.answer__list .answer__sub { display: block; }
.answer__none { margin: var(--sp-3) 0 0; font-weight: 600; }

/* ---- figures -------------------------------------------------------------- */
.figcard { margin-top: var(--sp-4); background: var(--c-card); border: 1px solid var(--c-line); border-radius: var(--r-card); padding: var(--sp-3); box-shadow: var(--shadow-1); }
.figcard figure { margin: 0 auto; max-width: 560px; }
.figcard--short figure { max-width: 480px; }
.figcard svg { display: block; width: 100%; height: auto; overflow: visible; }
.g-joint { fill: var(--c-joint-fig); }
.g-tile { fill: var(--c-tile); }
.g-cut { fill: var(--c-accent); fill-opacity: .88; }
.g-wall { fill: none; stroke: var(--c-fg); stroke-width: 1.5; }
.g-sw { stroke: var(--c-tile-edge); stroke-width: .8; }
.g-foot { fill: var(--c-accent-wash); fill-opacity: .55; stroke: var(--c-accent); stroke-width: 2.5; }
.g-dim { fill: var(--c-fg); font: 700 12px var(--f-sans); }
.g-dimline { fill: none; stroke: var(--c-fg-2); stroke-width: 1; }
.g-lab { fill: var(--c-fg); font: 700 13px var(--f-sans); }
.g-lab--acc { fill: var(--c-accent-text); }
.g-sub { fill: var(--c-fg-2); font: 600 11px var(--f-sans); }
.g-sec { stroke: var(--c-tile-edge); stroke-width: 1; }
.g-grout { fill: var(--c-accent); }
.g-bed { fill: var(--c-line); }
.g-slab { fill: var(--c-grout); }
.draw svg .pl, .draw svg .g-wall { transition: opacity var(--t-draw) var(--ease-out); }
.draw.is-drawing svg .pl { opacity: .35; }

/* ---- tables --------------------------------------------------------------- */
.card { background: var(--c-card); border: 1px solid var(--c-line); border-radius: var(--r-card); box-shadow: var(--shadow-1); overflow: hidden; }
/* A table wider than its card scrolls rather than losing its last columns. */
.card:has(> .t) { overflow-x: auto; overscroll-behavior-x: contain; }
.t {width: 100%; border-collapse: collapse; font-size: var(--fs-sm); }
.t caption { caption-side: top; text-align: left; padding: var(--sp-3) var(--sp-4); color: var(--c-fg-2); font-size: var(--fs-xs); border-bottom: 1px solid var(--c-line); }
.t th, .t td { padding: var(--sp-3) var(--sp-4); text-align: left; vertical-align: top; }
.t thead th { font-size: var(--fs-xs); font-weight: 700; color: var(--c-fg-2); text-transform: uppercase; letter-spacing: .05em; padding-top: var(--sp-2); padding-bottom: var(--sp-2); background: var(--c-row); }
.t tbody tr + tr > * { border-top: 1px solid var(--c-line); }
.t .n { text-align: right; white-space: nowrap; }
.t tbody th { font-weight: 600; }
.t tbody th small { display: block; font-weight: 500; font-size: var(--fs-xs); color: var(--c-fg-2); }
.t tr.is-current > * { background: var(--c-accent-wash); }
.t tr.is-current > th:first-child { box-shadow: inset 4px 0 0 var(--c-accent); }
.prod__brand { display: block; font-size: var(--fs-xs); font-weight: 600; }
.prod__brand a { display: inline-flex; align-items: center; min-height: 32px; min-width: 32px; margin: -8px 0 -2px; }
.prod__name { display: block; font-weight: 700; }
.chip { display: inline-block; margin-top: 4px; padding: 1px 8px; border-radius: var(--r-pill); font-size: 11px; font-weight: 700; letter-spacing: .03em; border: 1px solid var(--c-line); color: var(--c-fg-2); }
.chip--chart { border-color: var(--c-accent); color: var(--c-accent-text); }
.buy { font-weight: 700; }
.buy small { display: block; font-weight: 500; font-size: var(--fs-xs); color: var(--c-fg-2); white-space: normal; max-width: 7.5rem; margin-left: auto; }
.t .buy { white-space: normal; }
.t .buy > span { white-space: nowrap; }
.sz { display: inline-flex; align-items: center; gap: var(--sp-2); }
.t .glyph { width: 22px; height: 22px; }
.sz a { display: inline-flex; align-items: center; min-height: 32px; margin: -6px 0; white-space: nowrap; }

/* coverage chart: every joint is a column, so below ~560px the card scrolls sideways, tile sticky. */
.cov { overflow-x: auto; overscroll-behavior-x: contain; }
.cov:focus-visible { outline-offset: -3px; }
.t--chart { font-size: var(--fs-2xs); min-width: 34rem; }
.t--chart th, .t--chart td { padding: var(--sp-2) var(--sp-2); }
.t--chart thead th, .t--chart tbody th { position: sticky; left: 0; }
.t--chart tbody th { background: var(--c-card); z-index: 1; font-size: var(--fs-xs); }
.t--chart thead th:first-child { z-index: 2; }
.t--chart td.is-computed { font-style: italic; color: var(--c-fg-2); }
.cov + .cov__key { margin: var(--sp-2) 0 var(--sp-4); font-size: var(--fs-xs); color: var(--c-fg-2); }

/* ---- the tile glyph: four of the tile at its own proportion, on their joints, one glazed ---- */
.glyph { display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; flex: none; }
.glyph i {
  display: block; min-width: 5px; min-height: 5px; border: 1.5px solid var(--c-fg-2); border-radius: 2px;
  background:
    linear-gradient(90deg, transparent calc(50% - .75px), var(--c-joint-fig) calc(50% - .75px) calc(50% + .75px), transparent calc(50% + .75px)),
    linear-gradient(transparent calc(50% - .75px), var(--c-joint-fig) calc(50% - .75px) calc(50% + .75px), transparent calc(50% + .75px)),
    conic-gradient(from 90deg at 50% 50%, var(--c-accent) 0 25%, transparent 0),
    linear-gradient(160deg, var(--c-card), var(--c-tile));
}

/* ---- icons (design note 11) ------------------------------------------------ */
/* Two masks per icon from assets/icons/: the glaze layer under, the ink layer over. The ink is the
   text colour beside it, the glaze the jade accent, so dark mode is the token swap. */
.ico { position: relative; display: inline-block; flex: none; width: 1.3em; height: 1.3em; vertical-align: -.3em; }
.ico::before, .ico::after { content: ""; position: absolute; inset: 0; -webkit-mask: var(--m) center / contain no-repeat; mask: var(--m) center / contain no-repeat; }
.ico::before { --m: var(--i-g); background: var(--ico-g, var(--c-accent)); }
.ico::after { --m: var(--i); background: var(--ico-ink, currentColor); }
.ico--tile { --i: url(/assets/icons/tile.svg); --i-g: url(/assets/icons/tile-g.svg); }
.ico--grout { --i: url(/assets/icons/grout.svg); --i-g: url(/assets/icons/grout-g.svg); }
.ico--joint { --i: url(/assets/icons/joint.svg); --i-g: url(/assets/icons/joint-g.svg); }
.ico--thick { --i: url(/assets/icons/thick.svg); --i-g: url(/assets/icons/thick-g.svg); }
.ico--trowel { --i: url(/assets/icons/trowel.svg); --i-g: url(/assets/icons/trowel-g.svg); }
.ico--thinset { --i: url(/assets/icons/thinset.svg); --i-g: url(/assets/icons/thinset-g.svg); }
.ico--box { --i: url(/assets/icons/box.svg); --i-g: url(/assets/icons/box-g.svg); }
.ico--tape { --i: url(/assets/icons/tape.svg); --i-g: url(/assets/icons/tape-g.svg); }
.ico--area { --i: url(/assets/icons/area.svg); --i-g: url(/assets/icons/area-g.svg); }
.ico--straight { --i: url(/assets/icons/straight.svg); --i-g: url(/assets/icons/straight-g.svg); }
.ico--diagonal { --i: url(/assets/icons/diagonal.svg); --i-g: url(/assets/icons/diagonal-g.svg); }
.ico--floor { --i: url(/assets/icons/floor.svg); --i-g: url(/assets/icons/floor-g.svg); }
.ico--wall { --i: url(/assets/icons/wall.svg); --i-g: url(/assets/icons/wall-g.svg); }
.ico--backsplash { --i: url(/assets/icons/backsplash.svg); --i-g: url(/assets/icons/backsplash-g.svg); }
.ico--shower { --i: url(/assets/icons/shower.svg); --i-g: url(/assets/icons/shower-g.svg); }
.ico--bathroom { --i: url(/assets/icons/bathroom.svg); --i-g: url(/assets/icons/bathroom-g.svg); }
.ico--sizes { --i: url(/assets/icons/sizes.svg); --i-g: url(/assets/icons/sizes-g.svg); }
.ico--source { --i: url(/assets/icons/source.svg); --i-g: url(/assets/icons/source-g.svg); }
.field__l .ico, dt .ico, .h2--quiet .ico, .nav .ico { margin-right: .35em; }
.nav .ico { width: 18px; height: 18px; color: var(--c-fg-2); }
.nav a[aria-current="page"] .ico { color: inherit; }
@media (max-width: 440px) { .nav .ico { display: none; } }

/* The badge: a small glazed tile carrying a section's icon, with the gloss of the answer tile. */
.badge {
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  width: 32px; height: 32px; border-radius: 7px; color: var(--c-fg);
  background: linear-gradient(125deg, transparent 22%, var(--gloss-b) 34%, transparent 46%), linear-gradient(160deg, var(--c-card), var(--c-tile));
  border: 1px solid var(--c-tile-edge); box-shadow: inset 0 1px 0 var(--c-glaze-edge), 0 1px 2px rgba(28, 25, 23, .12);
}
.badge .ico { width: 22px; height: 22px; }
.badge--lg { width: 44px; height: 44px; border-radius: 9px; }
.badge--lg .ico { width: 30px; height: 30px; }

/* The answer tile's watermark: its material, large and faint in the corner, behind the text. */
.answer__mark { position: absolute; top: 10px; right: 10px; width: 104px; height: 104px; z-index: -1; opacity: .11; pointer-events: none; }

/* ---- inputs --------------------------------------------------------------- */
.inputs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-3); padding: var(--sp-4); margin: 0; }
.field { display: grid; grid-template-columns: minmax(0, 1fr); gap: 4px; min-width: 0; align-content: start; }
.field--wide { grid-column: 1 / -1; }
.field__l { font-size: var(--fs-xs); font-weight: 700; color: var(--c-fg-2); }
.field__in { display: flex; align-items: center; min-height: var(--hit); border: 1px solid var(--c-line); border-radius: var(--r-tile); background: var(--c-bg); padding: 0 var(--sp-3); }
.field__in:focus-within { border-color: var(--c-accent); box-shadow: 0 0 0 3px var(--c-accent-wash); }
.field input, .field select { flex: 1; min-width: 0; width: 100%; border: 0; background: transparent; color: inherit; font: 600 var(--fs-md) var(--f-sans); min-height: calc(var(--hit) - 2px); }
.field input:focus, .field select:focus { outline: none; }
.field select { cursor: pointer; }
.field__u { font-size: var(--fs-sm); color: var(--c-fg-2); }
.field__hint { font-size: var(--fs-xs); color: var(--c-fg-2); }
.field input[aria-invalid="true"] { color: var(--c-invalid); }
.field__in:has(input[aria-invalid="true"]) { border-color: var(--c-invalid); box-shadow: inset 0 -2px 0 var(--c-invalid); }
/* The − / + pair (design note 14): two small glazed tiles set into the field's right end, on a joint.
   Hidden, space kept, until assets/site.js binds them, so a page without script shows no dead button. */
.field__in--step { padding-right: 3px; gap: 2px; }
.field__in--step .field__u { margin-right: 4px; }
.step { display: flex; gap: 3px; flex: none; visibility: hidden; }
.js .step { visibility: visible; }
.step__b {
  display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 36px; padding: 0;
  border: 1px solid var(--c-tile-edge); border-radius: 5px; color: var(--c-fg); cursor: pointer; touch-action: manipulation;
  background: linear-gradient(125deg, transparent 22%, var(--gloss-b) 34%, transparent 46%), linear-gradient(160deg, var(--c-card), var(--c-tile));
  box-shadow: inset 0 1px 0 var(--c-glaze-edge);
  transition: background-color var(--t-fast) var(--ease-out), border-color var(--t-fast) var(--ease-out);
}
.step__b svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 2.25; stroke-linecap: round; }
.step__b:hover:not([aria-disabled="true"]) { border-color: var(--c-accent); color: var(--c-accent-text); }
.step__b:active:not([aria-disabled="true"]) { background: var(--c-accent-wash); }
.step__b:focus-visible { outline: 3px solid var(--c-ring); outline-offset: 1px; }
.step__b[aria-disabled="true"] { cursor: default; color: var(--c-fg-2); opacity: .45; }
@media (max-width: 400px) {
  .field__in--step { padding-left: var(--sp-2); }
  .step__b { width: 28px; }
}
.seg { grid-column: 1 / -1; border: 0; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: var(--sp-2); min-width: 0; }
.seg legend { padding: 0; margin-bottom: 4px; float: left; width: 100%; }
.seg label { flex: 1 1 8rem; position: relative; }
.seg input { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: pointer; }
.seg label > span { display: flex; align-items: center; justify-content: center; gap: var(--sp-2); min-height: var(--hit); padding: 0 var(--sp-2); border: 1px solid var(--c-line); border-radius: var(--r-tile); font-weight: 600; font-size: var(--fs-sm); text-align: center; cursor: pointer; transition: background var(--t-fast) var(--ease-out); }
.seg input:checked + span { background: var(--c-fg); color: var(--c-bg); border-color: var(--c-fg); }
.seg input:checked + span .glyph i { border-color: var(--c-bg); }
.seg input:focus-visible + span { outline: 3px solid var(--c-ring); outline-offset: 2px; }
.seg--sizes label { flex: 1 1 6.5rem; }
.seg--stack label { flex: 1 1 100%; }
.seg--stack label > span { justify-content: flex-start; padding: 0 var(--sp-3); }
.seg .ico { width: 20px; height: 20px; }
.seg legend .ico { width: 1.3em; height: 1.3em; margin-right: .35em; }
.seg input:checked + span .ico { --ico-g: var(--c-accent-inv); }
.seg--stack .ico { color: var(--c-fg-2); }
.seg--stack input:checked + span .ico { color: inherit; }

/* ---- link tiles ----------------------------------------------------------- */
.tiles { list-style: none; margin: 0; padding: 6px; display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 6px; background: var(--c-grout); border-radius: var(--r-card); }
.tile { position: relative; display: flex; flex-direction: column; justify-content: center; min-height: 64px; padding: var(--sp-2) var(--sp-3); background: var(--c-card); border-radius: var(--r-tile); box-shadow: inset 0 1px 0 var(--c-glaze-edge); transition: transform var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out); }
.tile:hover { transform: translateY(-1px); box-shadow: var(--shadow-1); }
.tile .glyph { position: absolute; top: 6px; right: 6px; width: 24px; height: 24px; }
.tile__n { font-weight: 700; font-size: var(--fs-sm); padding-right: 24px; }
.tile__n a { color: var(--c-fg); text-decoration: none; }
.tile__n a::after { content: ""; position: absolute; inset: 0; border-radius: var(--r-tile); }
.tile__n a:focus-visible { outline: none; }
.tile:has(a:focus-visible) { outline: 3px solid var(--c-ring); outline-offset: 2px; }
.tile:hover .tile__n a { color: var(--c-accent-text); }
.tile__t { font-size: var(--fs-xs); color: var(--c-fg-2); }
.tiles--wide { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
.tile--ico > .ico { position: absolute; top: 50%; right: 10px; width: 30px; height: 30px; margin-top: -15px; color: var(--c-fg-2); }
.tile--ico .tile__n { padding-right: 38px; }
.tile--ico:hover > .ico { color: var(--c-fg); }

/* The unit link (home, metric): one glazed tile of a card, the whole of it the link to the other calculator. */
.unit-alt { position: relative; margin: 0; display: flex; align-items: center; gap: var(--sp-3); min-height: 64px; padding: var(--sp-3) var(--sp-4); background: var(--c-card); border: 1px solid var(--c-line); border-left: 4px solid var(--c-accent); border-radius: var(--r-card); box-shadow: var(--shadow-1); font-size: var(--fs-sm); font-weight: 600; transition: box-shadow var(--t-fast) var(--ease-out); }
.unit-alt:hover { box-shadow: var(--shadow-2); }
.unit-alt a { color: var(--c-accent-text); }
.unit-alt a::after { content: ""; position: absolute; inset: 0; border-radius: var(--r-card); }
.unit-alt a:focus-visible { outline: none; }
.unit-alt:has(a:focus-visible) { outline: 3px solid var(--c-ring); outline-offset: 2px; }

/* ---- note, provenance, estimate line -------------------------------------- */
.note { margin: var(--sp-5) 0 0; padding: var(--sp-3) var(--sp-4); background: var(--c-card); border: 1px solid var(--c-line); border-radius: var(--r-card); font-size: var(--fs-sm); color: var(--c-fg-2); }
.note p { margin: 0; }
.note p + p { margin-top: var(--sp-2); }
.prov { font-size: var(--fs-xs); color: var(--c-fg-2); }
.prov__stamp { margin: 0 0 var(--sp-2); }
.fold { border-top: 1px solid var(--c-line); border-bottom: 1px solid var(--c-line); }
.fold summary { cursor: pointer; min-height: var(--hit); display: flex; align-items: center; gap: var(--sp-2); font-weight: 700; font-size: var(--fs-sm); color: var(--c-fg); list-style: none; }
.fold summary::-webkit-details-marker { display: none; }
.fold summary::before { content: ""; width: 7px; height: 7px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(-45deg); transition: transform var(--t-fast) var(--ease-out); flex: none; }
.fold[open] summary::before { transform: rotate(45deg); }
.fold ul { margin: 0 0 var(--sp-3); padding-left: 1.1em; }
.fold li + li { margin-top: var(--sp-2); }
.fold li { overflow-wrap: anywhere; }
.estimate { margin: var(--sp-4) 0 0; padding: var(--sp-3) var(--sp-4); border-left: 3px solid var(--c-accent); background: var(--c-card); font-size: var(--fs-xs); color: var(--c-fg-2); border-radius: 0 var(--r-tile) var(--r-tile) 0; }
.prose { max-width: 38rem; }
.prose::before {
  content: ""; display: block; width: min(100%, 13.5rem); height: 10px; margin-bottom: var(--sp-4); border-radius: 2px;
  background:
    linear-gradient(90deg, transparent calc(100% - 20px), var(--c-accent) calc(100% - 20px)),
    repeating-linear-gradient(90deg, var(--c-tile) 0 20px, var(--c-grout) 20px 23px);
  box-shadow: inset 0 -1px 0 var(--c-tile-edge);
}
.prose h2 { font-size: var(--fs-lg); margin: var(--sp-5) 0 var(--sp-2); }

/* ---- footer --------------------------------------------------------------- */
.foot { background: var(--c-fg); color: var(--c-bg); }
/* The footer's top edge is a bullnose trim: a course of tiles on their joints, every seventh glazed. */
.foot::before {
  content: ""; display: block; height: 12px;
  background:
    linear-gradient(rgba(255, 255, 255, .16), transparent 55%),
    repeating-linear-gradient(90deg, transparent 0 288px, var(--c-foot-spare) 288px 334px, transparent 334px 336px),
    repeating-linear-gradient(90deg, #3a3531 0 46px, #57534e 46px 48px);
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, .35);
}
.foot__in { max-width: var(--wrap); margin: 0 auto; padding: var(--sp-6) var(--sp-4); display: grid; gap: var(--sp-4); }
.foot a { color: inherit; }
.foot .bw--1 { color: var(--c-bg); }
.foot .bw--2 { color: var(--c-foot-word); }
.foot .bw--3 { color: #bdb5ac; }
.foot .mk-joint { fill: #57534e; }
.foot .mk-tile { fill: var(--c-bg); }
.foot .mk-glaze { fill: var(--c-foot-glaze); }
.foot h2 { font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: .08em; color: #bdb5ac; margin: 0 0 var(--sp-1); }
.foot ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0 var(--sp-4); }
.foot li a { display: inline-flex; align-items: center; min-height: var(--hit); font-size: var(--fs-sm); text-decoration: none; }
.foot li a:hover { text-decoration: underline; }
.foot__meta { margin: 0; display: grid; gap: 2px; font-size: var(--fs-xs); }
.foot__meta div { display: flex; flex-wrap: wrap; gap: 0 var(--sp-2); }
.foot__meta dt { color: #bdb5ac; }
.foot__meta dd { margin: 0; font-weight: 600; }
.foot__addr { overflow-wrap: anywhere; user-select: all; }
.foot__legal { margin: 0; font-size: var(--fs-xs); color: #bdb5ac; border-top: 1px solid #44403c; padding-top: var(--sp-4); }
@media (prefers-color-scheme: dark) {
  .foot { background: #0e0c0b; color: var(--c-fg); }
  .foot .bw--1, .foot .mk-tile { color: var(--c-fg); fill: var(--c-fg); }
}

/* ---- 404 ------------------------------------------------------------------ */
.dead { padding: var(--sp-6) 0; }
.dead__floor { width: 96px; height: 96px; display: block; }
.d-joint { fill: var(--c-grout); }
.d-tile { fill: var(--c-tile); stroke: var(--c-tile-edge); }
.d-gap { fill: none; stroke: var(--c-accent); stroke-width: 2; stroke-dasharray: 4 3; }
.go { display: inline-flex; align-items: center; min-height: var(--hit); padding: 0 var(--sp-5); border-radius: var(--r-tile); background: var(--c-fg); color: var(--c-bg); font-weight: 700; text-decoration: none; }

@media (min-width: 720px) {
  .floor { margin: 0; border-radius: var(--r-card); padding: var(--sp-6); }
  .answer { padding: var(--sp-6); }
  .inputs { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .inputs .field--wide { grid-column: span 2; }
  .foot__in { grid-template-columns: auto 1fr; align-items: center; column-gap: var(--sp-6); }
  .foot__meta { grid-column: 2; }
  .foot__legal { grid-column: 1 / -1; }
}

/* Four-column tables (area, size counts) hold 360px with tighter cells. */
.t:has(thead th:nth-child(4)):not(.t--chart) th, .t:has(thead th:nth-child(4)):not(.t--chart) td { padding-left: var(--sp-2); padding-right: var(--sp-2); }
.t:has(thead th:nth-child(4)):not(.t--chart) :is(th, td):first-child { padding-left: var(--sp-3); }
.t:has(thead th:nth-child(4)):not(.t--chart) :is(th, td):last-child { padding-right: var(--sp-3); }
.t:has(thead th:nth-child(4)):not(.t--chart) thead th { font-size: 11px; letter-spacing: .02em; }

@media (max-width: 380px) {
  .t th, .t td { padding-left: var(--sp-3); padding-right: var(--sp-3); }
  .t--chart th, .t--chart td { padding-left: 6px; padding-right: 6px; }
  .t:has(thead th:nth-child(4)):not(.t--chart) .sz { flex-direction: column; align-items: flex-start; gap: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .answer::before { display: none; }
}