/* Shopfloor — text-first industrial publication.
   No frameworks, no JavaScript required. Single stylesheet. */

:root {
  --bg: #fff;
  --ink: #16181a;
  --body: #2a2e32;
  --muted: #5d646b;
  --faint: #8a9299;
  --line: #e4e7e9;
  --line-strong: #16181a;
  --link: #0b5394;
  --visited: #5f3ea1;
  --code-bg: #f3f5f6;
  --mark: #fdf3d7;
  --maxw: 82ch;
  --touch: 2.75rem;
  --radius: 4px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "Noto Sans", "Liberation Sans", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101214;
    --ink: #e9ebec;
    --body: #c9ced2;
    --muted: #9aa3ab;
    --faint: #6d757d;
    --line: #262b2e;
    --line-strong: #e9ebec;
    --link: #7fb7ec;
    --visited: #b79bef;
    --code-bg: #1b1f22;
    --mark: #4a3d12;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

a { color: var(--link); text-decoration: none; }
a:visited { color: var(--visited); }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; }
img { max-width: 100%; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(1rem, 3vw, 1.75rem); }
main.wrap { padding-top: 0.8rem; padding-bottom: 2.5rem; }

/* ---- ebook strip ---- */
.ebook-strip {
  background: var(--mark);
  border-bottom: 1px solid var(--line);
  font-size: 0.82rem; color: var(--muted);
}
.ebook-strip .wrap { padding-top: 0.3rem; padding-bottom: 0.3rem; }
.ebook-strip a { font-weight: 600; }

/* ---- masthead ---- */
.masthead { border-bottom: 2px solid var(--line-strong); }
.masthead .wrap {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.3rem 1.1rem;
  padding-top: 0.9rem; padding-bottom: 0.7rem;
}
.wordmark {
  font-size: 1.3rem; font-weight: 800; letter-spacing: -0.02em;
  color: var(--ink); line-height: 1.2;
}
.brand { display: inline-flex; align-items: center; gap: 0.5rem; }
.brand img {
  display: block; width: 23px; height: 23px; border-radius: var(--radius);
  background: #16181a; border: 1px solid #c8a415;
}
.wordmark a, .wordmark a:visited { color: var(--ink); }
.wordmark a:hover { text-decoration: none; }
.tagline { color: var(--muted); font-size: 0.85rem; }
.sitesearch { margin-left: auto; display: flex; gap: 0.45rem; align-items: center; max-width: 24rem; flex: 1 1 16rem; }
.sitesearch input {
  width: 10.5rem; min-width: 0; min-height: var(--touch); font-size: 0.88rem; font-family: var(--sans);
  padding: 0.45rem 0.65rem; color: var(--body);
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
}
.sitesearch button {
  min-height: var(--touch); font-size: 0.82rem; font-family: var(--sans); padding: 0.35rem 0.75rem;
  color: var(--body); background: var(--code-bg);
  border: 1px solid var(--line); border-radius: var(--radius); cursor: pointer;
  white-space: nowrap;
}
.sitesearch input:focus-visible, .sitesearch button:focus-visible,
.share-link input:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; }
.sitesearch button:hover { border-color: var(--muted); background: var(--bg); }
nav.main {
  flex: 1 0 100%; display: flex; flex-wrap: wrap; gap: 0.15rem 1.15rem;
  margin: 0.35rem 0 0; padding-top: 0.6rem; border-top: 1px solid var(--line);
  font-size: 0.9rem;
}
nav.main a { min-height: 2rem; display: inline-flex; align-items: center; white-space: nowrap; }
.menuwrap { display: none; }
.dateline {
  border-bottom: 1px solid var(--line);
  color: var(--faint); font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
}
.dateline .wrap { padding-top: 0.35rem; padding-bottom: 0.35rem; }

/* ---- homepage introduction ---- */
.home-intro { margin: 1.45rem 0 0.2rem; padding: 0.2rem 0 1.25rem; border-bottom: 1px solid var(--line); }
.home-intro h1 {
  max-width: 20ch; margin: 0 0 0.35rem; color: var(--ink);
  font-size: clamp(1.8rem, 4vw, 2.5rem); line-height: 1.12; letter-spacing: -0.025em;
}
.home-intro p { max-width: 66ch; margin: 0; color: var(--muted); }

/* ---- feed ---- */
.section-head {
  display: flex; align-items: baseline; gap: 0.75rem;
  margin: 2.3rem 0 0.2rem;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 0.4rem;
}
.section-head h2 {
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--ink); margin: 0;
}
.section-head .more { margin-left: auto; font-size: 0.82rem; white-space: nowrap; }

ol.feed, ul.feed { list-style: none; margin: 0; padding: 0; }
.feed > li {
  padding: 0.85rem 0 0.9rem;
  border-bottom: 1px solid var(--line);
}
.feed .rank {
  color: var(--faint); font-size: 0.8rem; min-width: 2.2ch; flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.feed .row { display: flex; gap: 0.6rem; align-items: baseline; }
.feed h3 {
  font-size: 1.02rem; line-height: 1.42; margin: 0; font-weight: 600;
  color: var(--ink); min-width: 0; overflow-wrap: break-word;
}
.feed h3 a:visited { color: var(--visited); }
.feed .src { color: var(--faint); font-weight: 400; font-size: 0.82rem; white-space: nowrap; }
.feed .dek { margin: 0.25rem 0 0; font-size: 0.92rem; color: var(--body); }
.feed .meta {
  margin: 0.22rem 0 0; font-size: 0.78rem; color: var(--faint);
  font-variant-numeric: tabular-nums;
}
.feed .meta a, .feed .meta a:visited { color: var(--muted); }
.kind {
  display: inline-block; font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.06em;
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0 0.3em; margin-right: 0.4em; color: var(--muted);
  vertical-align: baseline; white-space: nowrap;
}
.kind-orig { border-color: var(--ink); color: var(--ink); }

/* ---- article ---- */
.article-head { margin: 1.9rem 0 1.1rem; }
.article-head h1 {
  font-size: clamp(1.85rem, 4vw, 2.65rem); line-height: 1.14; letter-spacing: -0.025em;
  color: var(--ink); margin: 0 0 0.45rem; overflow-wrap: break-word;
}
.article-head .dek { font-size: 1.02rem; line-height: 1.5; color: var(--muted); margin: 0 0 0.55rem; }
.byline { font-size: 0.82rem; color: var(--faint); font-variant-numeric: tabular-nums; margin: 0; }
.byline a, .byline a:visited { color: var(--muted); }
.prose { max-width: 72ch; }
.prose h2 { font-size: 1.28rem; color: var(--ink); margin: 2em 0 0.55em; letter-spacing: -0.012em; line-height: 1.3; }
.prose h3 { font-size: 1rem; color: var(--ink); margin: 1.5em 0 0.45em; line-height: 1.4; }
.prose p, .prose ul, .prose ol { margin: 0 0 0.95em; }
.prose li { margin: 0 0 0.32em; }
.prose li::marker { color: var(--muted); }
.prose blockquote {
  margin: 1.1em 0; padding: 0.1em 0 0.1em 1em;
  border-left: 3px solid var(--line-strong); color: var(--muted);
}
.prose blockquote p { margin: 0.4em 0; }
.prose code {
  font-family: var(--mono); font-size: 0.86em;
  background: var(--code-bg); padding: 0.08em 0.35em; border-radius: var(--radius);
  overflow-wrap: break-word;
}
.prose pre {
  font-family: var(--mono); font-size: 0.85rem; line-height: 1.5;
  background: var(--code-bg); padding: 0.85rem 1rem; border-radius: var(--radius);
  overflow-x: auto;
}
.prose pre code { background: none; padding: 0; overflow-wrap: normal; }
.prose table { border-collapse: collapse; margin: 1em 0; font-size: 0.9rem; width: 100%; }
.prose th, .prose td { border: 1px solid var(--line); padding: 0.4em 0.65em; text-align: left; }
.prose th { color: var(--ink); background: var(--code-bg); }
.prose hr { border: none; border-top: 1px solid var(--line); margin: 1.7em 0; }
.prose img {
  display: block; max-width: 100%; height: auto; margin: 1.3em auto;
  border: 1px solid var(--line); border-radius: 4px; background: var(--bg);
}
.prose a { overflow-wrap: break-word; }
.footnote { font-size: 0.85rem; color: var(--muted); border-top: 1px solid var(--line); margin-top: 2.1rem; padding-top: 0.75rem; overflow-wrap: break-word; }

/* ---- editorial discovery / ebook ---- */
.article-discovery, .ebook-recommendation {
  max-width: 72ch; margin: 1.8rem 0 0; padding: 0.8rem 0 0;
  border-top: 1px solid var(--line);
}
.article-discovery h2 { margin: 0 0 0.3rem; font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink); }
.article-discovery p { margin: 0.25rem 0; font-size: 0.9rem; color: var(--muted); }
.ebook-recommendation {
  padding: 0.85rem 1rem; border: 1px solid var(--line); border-left: 3px solid var(--line-strong);
  background: var(--code-bg); border-radius: var(--radius);
}
.ebook-recommendation p { margin: 0; font-size: 0.92rem; color: var(--body); }

/* ---- topic / index pages ---- */
.page-head { margin: 1.9rem 0 1.1rem; }
.page-head h1 { font-size: 1.55rem; line-height: 1.25; color: var(--ink); margin: 0 0 0.4rem; letter-spacing: -0.015em; overflow-wrap: break-word; }
.page-head p { margin: 0; color: var(--muted); max-width: 64ch; }
.topic-grid { margin: 1.1rem 0 2rem; padding: 0; list-style: none; columns: 2; column-gap: 2.5rem; }
.topic-grid li { break-inside: avoid; padding: 0.5rem 0; border-bottom: 1px solid var(--line); font-size: 0.95rem; }
.topic-grid .count { color: var(--faint); font-size: 0.8rem; font-variant-numeric: tabular-nums; }
.topic-grid .t-desc { display: block; font-size: 0.82rem; color: var(--muted); margin-top: 0.1rem; }
@media (max-width: 560px) { .topic-grid { columns: 1; } }

/* ---- footer ---- */
footer.site {
  margin-top: 3rem; border-top: 2px solid var(--line-strong);
  font-size: 0.85rem; color: var(--muted);
}
footer.site .wrap { padding-top: 1rem; padding-bottom: 3rem; }
footer.site .cols { display: flex; flex-wrap: wrap; gap: 0.5rem 2.5rem; }
footer.site p { margin: 0 0 0.6rem; max-width: 72ch; }
footer.site ul { list-style: none; margin: 0; padding: 0; }
footer.site li { display: inline; margin-right: 1rem; line-height: 1.9; }

/* misc */
.skip { position: absolute; left: -9999px; }
.skip:focus { position: static; display: block; padding: 0.5rem 1rem; background: var(--mark); }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.stamp { font-size: 0.8rem; color: var(--faint); font-variant-numeric: tabular-nums; margin: 0.7rem 0 0; }

/* visit beacon: 1px, invisible, layout-free */
.beacon { position: absolute; width: 1px; height: 1px; opacity: 0; }

/* breadcrumbs */
.crumbs { font-size: 0.82rem; color: var(--faint); margin: 0.9rem 0 0; }
.crumbs a, .crumbs a:visited { color: var(--muted); }

/* share row (plain links, no JavaScript) */
.share { font-size: 0.88rem; color: var(--muted); margin: 1.5rem 0 0.35rem; }
.share span { color: var(--faint); }
.share-link { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; color: var(--muted); margin: 0 0 1rem; }
.share-link input {
  flex: 1; min-width: 0; min-height: 2.5rem; font-family: var(--mono); font-size: 0.78rem;
  background: var(--code-bg); color: var(--body);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 0.32rem 0.5rem;
}

/* promo / events grouping on Fresh */
details.promo { margin: 1.6rem 0 0; border-top: 1px solid var(--line-strong); padding-top: 0.3rem; }
details.promo summary {
  cursor: pointer; font-size: 0.8rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--ink); font-weight: 700;
  padding: 0.25rem 0;
}
details.promo summary:hover { text-decoration: underline; }

/* search page */
.page-search { margin: 1.1rem 0 1.2rem; max-width: 34rem; }
.page-search label { font-size: 0.85rem; color: var(--muted); margin-right: 0.1rem; }
.page-search input { flex: 1; min-width: 0; width: auto; }

/* related topics */
.rel-topics { font-size: 0.9rem; margin: 0.2rem 0 0; }

/* glossary */
.glossary-index {
  display: flex; flex-wrap: wrap; gap: 0.15rem 0.3rem; margin: 1.1rem 0 0;
  padding: 0.55rem 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.glossary-index a {
  min-width: 2.5rem; min-height: var(--touch); display: inline-flex; align-items: center;
  justify-content: center; color: var(--link); font-weight: 700;
}
dl.gloss { margin: 1.1rem 0 2rem; padding: 0; }
dl.gloss dt { font-weight: 700; margin-top: 0.9rem; color: var(--ink); }
dl.gloss dt a, dl.gloss dt a:visited { color: var(--ink); }
dl.gloss dd { margin: 0.15rem 0 0; padding-bottom: 0.75rem; border-bottom: 1px solid var(--line); color: var(--body); }

/* scrollable tables on narrow screens */
.table-scroll { overflow-x: auto; margin: 1em 0; }
.table-scroll table { margin: 0; min-width: 34rem; }
.prose .table-scroll { margin-left: 0; margin-right: 0; }

/* ---- compact navigation / small screens ---- */
@media (max-width: 760px) {
  .masthead .sitesearch { order: 3; margin-left: 0; max-width: none; flex-basis: 100%; }
  nav.main { display: none; }
  .menuwrap { display: block; width: 100%; order: 4; }
  .menuwrap summary { cursor: pointer; color: var(--link); font-size: 0.9rem; min-height: var(--touch); display: flex; align-items: center; }
  .menuwrap nav a { display: block; min-height: var(--touch); padding: 0.3rem 0; font-size: 0.92rem; }
}

@media (max-width: 560px) {
  body { font-size: 15.5px; }
  .wrap { padding: 0 1rem; }
  .wordmark { font-size: 1.2rem; }
  .brand img { width: 21px; height: 21px; }
  .masthead .sitesearch input { flex: 1; min-width: 0; width: auto; }
  .home-intro { margin-top: 1.1rem; }
  .article-head h1 { font-size: 1.75rem; }
  .page-head h1 { font-size: 1.32rem; }
  .feed .src { white-space: normal; }
  .feed .row { gap: 0.45rem; }
  .share-link input { font-size: 0.72rem; }
  .article-discovery, .ebook-recommendation { margin-top: 1.35rem; }
}