/* Self-hosted Google Fonts (SIL Open Font License), latin subset only */
@font-face {
  font-family: 'Barlow Condensed';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(/static/fonts/barlow-condensed-600.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Barlow Condensed';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url(/static/fonts/barlow-condensed-700.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(/static/fonts/jetbrains-mono-500.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Public Sans';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url(/static/fonts/public-sans-400i.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Public Sans';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(/static/fonts/public-sans-400.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Public Sans';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(/static/fonts/public-sans-400.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* Foot & Yard: concrete-grey base, graphite ink, tape-measure yellow */
:root {
  --bg: #e8ebee;
  --paper: #ffffff;
  --ink: #1c2026;
  --ink-2: #4a525c;
  --rule: #c5cbd2;
  --tape: #f6c400;
  --tape-ink: #1c2026;
  --tape-deep: #8a6d00;
  --grid: rgba(28, 32, 38, 0.06);
  --fill-1: #f9e7a3;
  --fill-2: #cfd5dc;
  --fill-3: #a9b1ba;
  --fill-4: #8a7560;
  --water: #b9d7ec;
  --bad: #a3271d;
  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --body: "Public Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  --r: 6px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121417;
    --paper: #1a1d21;
    --ink: #e6e8eb;
    --ink-2: #a4acb6;
    --rule: #343a42;
    --tape: #ffd21a;
    --tape-ink: #15171a;
    --tape-deep: #ffd21a;
    --grid: rgba(230, 232, 235, 0.05);
    --fill-1: #6b5a17;
    --fill-2: #4a525c;
    --fill-3: #66707b;
    --fill-4: #5e4e3e;
    --water: #24506e;
    --bad: #ff8f84;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1rem/1.6 var(--body);
}
img, svg { max-width: 100%; }
a { color: inherit; text-decoration-color: var(--tape-deep); text-decoration-thickness: 2px; text-underline-offset: 3px; }
a:hover { text-decoration-color: currentColor; }
:focus-visible { outline: 3px solid var(--tape); outline-offset: 2px; box-shadow: 0 0 0 5px var(--ink); border-radius: 2px; }
h1, h2, h3 { font-family: var(--display); font-weight: 700; line-height: 1.1; letter-spacing: 0.01em; }
h1 { font-size: clamp(2.4rem, 6vw, 3.6rem); margin: 0; }
h2 { font-size: 1.85rem; margin: 2.2rem 0 0.6rem; }
h3 { font-size: 1.35rem; margin: 1.6rem 0 0.4rem; }
.small { font-size: 0.875rem; color: var(--ink-2); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; top: 0; background: var(--tape); color: var(--tape-ink); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

/* Header: the tape strip under it is the site's measuring edge */
.site-head { background: var(--ink); color: var(--bg); position: relative; }
.site-head::after {
  content: ""; display: block; height: 14px;
  background:
    repeating-linear-gradient(90deg, var(--tape-ink) 0 2px, transparent 2px 60px) 0 0 / 100% 12px no-repeat,
    repeating-linear-gradient(90deg, var(--tape-ink) 0 1px, transparent 1px 12px) 0 0 / 100% 6px no-repeat,
    var(--tape);
}
@media (prefers-color-scheme: dark) { .site-head { background: #0b0c0e; color: var(--ink); } }
.head-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; flex-wrap: wrap; padding-block: 8px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 700 1.6rem/1 var(--display); letter-spacing: 0.02em; }
.logo svg { width: 34px; height: 34px; }
.logo b { color: var(--tape); }
.site-head nav ul { list-style: none; display: flex; flex-wrap: wrap; gap: 4px 18px; margin: 0; padding: 0; }
.site-head nav a { text-decoration: none; font: 600 1.05rem/1 var(--display); letter-spacing: 0.03em; text-transform: uppercase; padding: 6px 0; display: inline-block; }
.site-head nav a:hover, .site-head nav a[aria-current] { box-shadow: inset 0 -3px 0 var(--tape); }

.crumbs { font-size: 0.875rem; color: var(--ink-2); margin: 20px 0 8px; }
.crumbs a { color: var(--ink-2); }
.tool-head { margin-bottom: 20px; }
.promise { font-size: 1.125rem; margin: 6px 0 0; max-width: 62ch; color: var(--ink-2); }

/* Calculator */
.tool { display: grid; gap: 16px; align-items: start; }
/* On phones the main result stays pinned while you scroll through the inputs */
.tool > .big { position: sticky; top: 0; z-index: 2; box-shadow: 0 2px 0 var(--bg); }
@media (min-width: 860px) {
  .tool { grid-template-columns: minmax(300px, 380px) 1fr; grid-template-rows: auto 1fr; }
  .tool > .big { position: static; grid-column: 2; grid-row: 1; box-shadow: none; }
  .tool > .inputs { grid-column: 1; grid-row: 1 / span 2; }
  .tool > .outputs { grid-column: 2; grid-row: 2; }
}
.inputs, .outputs, .shop {
  background: var(--paper); border: 1px solid var(--rule); border-radius: var(--r); padding: 16px;
}
.inputs { display: grid; gap: 14px; min-width: 0; }
.inputs > div { display: grid; gap: 14px; }
.inputs .sub { margin: 6px 0 0; font: 700 1.1rem/1.1 var(--display); text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-2); }
.field label, .seg legend { display: block; font-weight: 600; font-size: 0.95rem; margin-bottom: 4px; }
.ctl { display: flex; }
.ctl input, .ctl select, .row-del {
  font: 500 1rem/1.2 var(--mono); color: var(--ink); background: var(--bg);
  border: 1px solid var(--rule); padding: 10px; min-height: 44px; border-radius: var(--r);
}
.ctl input { flex: 1 1 0; width: 100%; min-width: 0; font-variant-numeric: tabular-nums; }
.ctl input:only-child, .ctl select:only-child { width: 100%; }
.ctl input + select, .ctl input + .unit { border-radius: 0 var(--r) var(--r) 0; border-left: 0; flex: 0 0 auto; }
.ctl input:has(+ select), .ctl input:has(+ .unit) { border-radius: var(--r) 0 0 var(--r); }
.ctl .unit { display: flex; align-items: center; padding: 0 12px; font: 500 0.95rem var(--mono); background: var(--bg); border: 1px solid var(--rule); color: var(--ink-2); }
.ctl input[aria-invalid="true"] { border-color: var(--bad); box-shadow: inset 0 0 0 1px var(--bad); }
.hint { margin: 4px 0 0; font-size: 0.85rem; color: var(--ink-2); }
.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.seg { border: 0; margin: 0; padding: 0; min-width: 0; }
.seg-row { display: flex; flex-wrap: wrap; gap: 6px; }
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.seg span { display: block; padding: 8px 12px; min-height: 40px; border: 1px solid var(--rule); border-radius: var(--r); font-weight: 600; font-size: 0.95rem; background: var(--bg); }
.seg input:checked + span { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.seg input:focus-visible + span { outline: 3px solid var(--tape); outline-offset: 2px; }
[hidden] { display: none !important; }

/* The result reads off a strip of tape */
.big {
  background:
    repeating-linear-gradient(90deg, var(--tape-ink) 0 2px, transparent 2px 60px) 0 0 / 100% 14px no-repeat,
    repeating-linear-gradient(90deg, var(--tape-ink) 0 1px, transparent 1px 12px) 0 0 / 100% 7px no-repeat,
    var(--tape);
  color: var(--tape-ink); border-radius: 4px; padding: 22px 16px 12px;
}
.big-l { display: block; font: 700 1rem/1.2 var(--display); text-transform: uppercase; letter-spacing: 0.08em; }
.big-n { display: block; font: 500 clamp(2.2rem, 7vw, 3.2rem)/1.1 var(--mono); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.big-n .u { font-size: 0.45em; }
.spec { margin: 0; border-top: 2px solid var(--ink); }
.r-row { display: flex; justify-content: space-between; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--rule); }
.r-row dt { color: var(--ink-2); }
.r-row dd { margin: 0; text-align: right; font: 500 1rem/1.4 var(--mono); font-variant-numeric: tabular-nums; }
.r-row .u { color: var(--ink-2); font-size: 0.85em; }
.warn { margin: 12px 0 0; padding: 10px 12px; border: 1px solid var(--bad); border-radius: var(--r); color: var(--bad); font-weight: 600; font-size: 0.95rem; }
.diagram { margin: 16px 0 0; }
.diagram svg {
  display: block; width: 100%; height: auto; aspect-ratio: 5 / 3;
  background-color: var(--bg);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 20px 20px; border-radius: 4px;
}
.diagram figcaption { font-size: 0.85rem; color: var(--ink-2); margin-top: 6px; }
.d-obj { fill: var(--fill-1); stroke: var(--ink); stroke-width: 1.5; }
.d-l1 { fill: var(--fill-2); stroke: var(--ink); stroke-width: 1; }
.d-l2 { fill: var(--fill-3); stroke: var(--ink); stroke-width: 1; }
.d-l3 { fill: var(--fill-4); stroke: var(--ink); stroke-width: 1; }
.d-water { fill: var(--water); stroke: var(--ink); stroke-width: 1.5; }
.d-cut { fill: var(--bg); stroke: var(--ink); stroke-width: 1; stroke-dasharray: 4 3; }
.d-line { fill: none; stroke: var(--ink); stroke-width: 1.5; }
.d-dim { fill: none; stroke: var(--ink-2); stroke-width: 1; }
.d-txt { fill: var(--ink); font: 500 12px var(--mono); }
.d-lab { fill: var(--ink-2); font: 600 11px var(--body); text-transform: uppercase; letter-spacing: 0.05em; }
.share { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 14px; }
.btn {
  font: 600 0.95rem var(--body); color: var(--paper); background: var(--ink); border: 0; border-radius: var(--r);
  padding: 10px 14px; min-height: 44px; cursor: pointer;
}
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--ink); }
.share-msg { font-size: 0.9rem; color: var(--ink-2); }

/* Repeating rows (several areas) */
.rows { display: grid; gap: 12px; }
.area-row { border: 1px solid var(--rule); border-radius: var(--r); padding: 12px; display: grid; gap: 10px; }
.area-row-h { display: flex; justify-content: space-between; align-items: center; font-weight: 600; }
.row-del { font-family: var(--body); font-size: 0.85rem; cursor: pointer; min-height: 36px; padding: 6px 10px; }

.shop { margin-top: 16px; }
.shop h2 { margin-top: 0; }
.shop-list { margin: 0; padding: 0; list-style: none; columns: 2 260px; column-gap: 24px; }
.shop-list li { break-inside: avoid; padding: 8px 0; border-bottom: 1px dashed var(--rule); display: flex; gap: 10px; }
.shop-list b { font: 500 1rem var(--mono); min-width: 5.5ch; text-align: right; flex: 0 0 auto; }

/* Ad slots stay out of the layout until ads are switched on; then height is reserved */
.ad { display: none; }
.ads-on .ad { display: block; background: var(--paper); border: 1px dashed var(--rule); }
.ads-on .ad-wide { min-height: 280px; margin: 16px 0; }
.ads-on .ad-side { min-height: 600px; position: sticky; top: 16px; }

/* Guide */
.article { display: grid; gap: 32px; margin-top: 16px; }
@media (min-width: 1000px) { .ads-on .article { grid-template-columns: minmax(0, 1fr) 300px; } }
.side:empty { display: none; }
.prose { max-width: 70ch; }
.prose p, .prose li { font-size: 1.0625rem; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.95rem; margin: 12px 0; display: block; overflow-x: auto; }
.prose th, .prose td { border-bottom: 1px solid var(--rule); padding: 8px 10px 8px 0; text-align: left; vertical-align: top; }
.prose th { font-family: var(--display); font-size: 1.05rem; letter-spacing: 0.03em; text-transform: uppercase; border-bottom: 2px solid var(--ink); }
.prose td.n { font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
.formula { font: 500 1rem/1.6 var(--mono); background: var(--paper); border: 1px solid var(--rule); border-radius: var(--r); padding: 12px 14px; overflow-x: auto; }
.faq details { border-bottom: 1px solid var(--rule); padding: 4px 0; }
.faq summary { cursor: pointer; font-weight: 600; padding: 10px 0; font-size: 1.0625rem; }
.faq p { margin: 0 0 12px; }
.sources { padding-left: 1.2em; }
.sources li { font-size: 0.95rem; margin: 4px 0; }

.related { margin: 8px 0 48px; }
.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }
.card {
  display: block; height: 100%; text-decoration: none; background: var(--paper);
  border: 1px solid var(--rule); border-radius: var(--r); padding: 14px;
}
.card:hover { border-color: var(--ink); box-shadow: inset 0 -4px 0 var(--tape); }
.card b { display: block; font: 700 1.3rem/1.15 var(--display); margin-bottom: 4px; }
.card span { display: block; font-size: 0.95rem; color: var(--ink-2); }
.cards-lg { margin-bottom: 24px; }

/* Home */
.home-hero { display: grid; gap: 24px; padding: 32px 0 8px; align-items: end; }
@media (min-width: 860px) { .home-hero { grid-template-columns: 1.3fr 1fr; } }
.home-hero h1 { font-size: clamp(2.6rem, 7vw, 4.4rem); }
.home-hero h1 span { background: linear-gradient(transparent 62%, var(--tape) 62% 92%, transparent 92%); }
.hub-block { margin: 28px 0; }
.hub-block h2 { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; border-bottom: 2px solid var(--ink); padding-bottom: 6px; }
.hub-block h2 a { font: 600 0.95rem var(--body); }

.site-foot { background: var(--paper); border-top: 1px solid var(--rule); padding: 24px 0 32px; margin-top: 32px; }
.foot-row ul { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.foot-row p { max-width: 70ch; }

@media print {
  .site-head, .site-foot, .share, .ad, .related, .crumbs { display: none; }
  body { background: #fff; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }

/* Phones: hub links scroll sideways in one row instead of wrapping onto three */
@media (max-width: 700px) {
  .site-head nav { width: 100%; overflow-x: auto; scrollbar-width: none; -webkit-mask-image: linear-gradient(90deg, #000 85%, transparent); mask-image: linear-gradient(90deg, #000 85%, transparent); }
  .site-head nav::-webkit-scrollbar { display: none; }
  .site-head nav ul { flex-wrap: nowrap; white-space: nowrap; padding-right: 32px; }
}