:root {
  --white: #fff;
  --off: #fbfcff;
  --paper: #f5f7fb;
  --navy: #0d1b3d;
  --navy-2: #142851;
  --graphite: #33373d;
  --muted: #66738a;
  --blue: #0066ff;
  --blue-2: #2c7cff;
  --blue-wash: #edf4ff;
  --line: rgba(13, 27, 61, .12);
  --line-strong: rgba(13, 27, 61, .22);
  --font-serif: Georgia, "Times New Roman", serif;
  --font-body: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --prose: 920px;
  --wide: 1120px;
  --shadow: 0 28px 90px rgba(13, 27, 61, .10);
  --ease: cubic-bezier(.2, .8, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--navy);
  background: var(--paper);
  font: 400 16px/1.65 var(--font-body);
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; height: auto; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
::selection { background: var(--blue); color: #fff; }

.chrome {
  position: sticky;
  top: 0;
  z-index: 500;
}
.review-banner {
  background: var(--navy);
  color: #fff;
  text-align: center;
  padding: .65rem 1.2rem;
  font: 500 .68rem/1.35 var(--font-mono);
  letter-spacing: .14em;
  text-transform: uppercase;
}
.review-banner em {
  color: var(--blue-2);
  font-style: normal;
}
.site-header {
  background: rgba(255, 255, 255, .95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.header-inner {
  max-width: var(--wide);
  margin: 0 auto;
  min-height: 72px;
  padding: .6rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}
.brand { display: block; flex: none; }
.brand img { display: block; width: 168px; height: auto; }
.primary-nav {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}
.primary-nav a {
  font: 500 .62rem/1 var(--font-mono);
  letter-spacing: .03em;
  text-transform: uppercase;
  color: var(--navy);
  text-decoration: none;
}
.primary-nav a:hover,
.primary-nav a[aria-current="page"] { color: var(--blue); }
.primary-nav a[aria-current="page"] { text-decoration: none; border-bottom: 1px solid var(--blue); padding-bottom: .2rem; }

.mod-nav {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.mod-nav ol {
  max-width: var(--wide);
  margin: 0 auto;
  padding: .55rem 1.25rem;
  list-style: none;
  display: flex;
  gap: .35rem .9rem;
  white-space: nowrap;
}
.mod-nav a {
  font: 500 .62rem/1.4 var(--font-mono);
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
}
.mod-nav a:hover { color: var(--blue); }

main {
  max-width: var(--prose);
  margin: 0 auto;
  padding: 2.4rem 1.25rem 4.5rem;
}
.eyebrow {
  margin: 0 0 .9rem;
  color: var(--blue);
  font: 500 .68rem/1.35 var(--font-mono);
  letter-spacing: .14em;
  text-transform: uppercase;
}
h1 {
  margin: 0 0 1.1rem;
  font: 500 clamp(2.4rem, 5vw, 3.6rem)/.95 var(--font-serif);
  letter-spacing: -.04em;
}
h1 em { color: var(--blue); font-style: italic; font-weight: 500; }
.lede {
  color: var(--graphite);
  font-size: 1.05rem;
  max-width: 68ch;
}
.lede p { margin: 0 0 .85rem; }

.toc {
  margin: 2rem 0 2.4rem;
  padding: 1.35rem 1.4rem 1.2rem;
  background: var(--white);
  border: 1px solid var(--line);
}
.toc .eyebrow { margin-bottom: .85rem; }
.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .45rem .8rem;
}
.toc a {
  color: var(--navy);
  font: 500 .92rem/1.4 var(--font-body);
  text-decoration: none;
  display: flex;
  gap: .7rem;
}
.toc a:hover { color: var(--blue); }
.toc .num {
  color: var(--blue);
  font: 500 .68rem/1.6 var(--font-mono);
  letter-spacing: .06em;
  min-width: 1.6rem;
}

.prose {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 2rem 1.6rem 2.4rem;
}
.prose > :first-child { margin-top: 0; }
.prose h2 {
  margin: 2.6rem 0 .9rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line);
  font: 500 clamp(1.7rem, 3.2vw, 2.35rem)/1.12 var(--font-serif);
  letter-spacing: -.03em;
  scroll-margin-top: 10.5rem;
}
.prose h2:first-child { border-top: 0; padding-top: 0; margin-top: 0; }
.prose h3 {
  margin: 1.8rem 0 .7rem;
  font: 600 1.05rem/1.35 var(--font-body);
  letter-spacing: -.01em;
  scroll-margin-top: 10.5rem;
}
.prose h4 {
  margin: 1.2rem 0 .45rem;
  font: 600 .92rem/1.35 var(--font-body);
}
.prose p { margin: 0 0 1rem; }
.prose p.label { margin: 1.15rem 0 .3rem; }
.prose h2 + p.label, .prose figure.diagram + p.label { margin-top: .15rem; }
.prose ul ul, .prose ol ul, .prose ul ol { margin: .3rem 0 .15rem; }
.prose .check-list { padding-left: .15rem; }
.prose ul, .prose ol { margin: 0 0 1.1rem; padding-left: 1.2rem; }
.prose li { margin: .28rem 0; }
.prose li::marker { color: var(--blue); }
.prose strong { font-weight: 700; }
.prose hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}
.prose code {
  font: 500 .82em/1.4 var(--font-mono);
  background: var(--blue-wash);
  color: var(--navy);
  padding: .08em .32em;
}
.prose pre {
  margin: 0 0 1.2rem;
  padding: 1rem 1.1rem;
  background: var(--paper);
  border: 1px solid var(--line);
  overflow-x: auto;
  font: 500 .82rem/1.5 var(--font-mono);
}
.prose pre code { background: none; padding: 0; }
.prose blockquote {
  margin: 1.1rem 0 1.3rem;
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--blue);
  background: var(--paper);
  color: var(--navy-2);
}
.prose blockquote p { margin: 0 0 .7rem; }
.prose blockquote p:last-child { margin-bottom: 0; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.3rem;
  font-size: .92rem;
}
.prose th, .prose td {
  border: 1px solid var(--line);
  padding: .55rem .7rem;
  text-align: left;
  vertical-align: top;
}
.prose th {
  background: var(--paper);
  font: 500 .68rem/1.35 var(--font-mono);
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--navy);
}
.prose td { color: var(--navy-2); }

figure.diagram {
  margin: 1.1rem -1.6rem 1.5rem;
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
figure.diagram img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--white);
}
figure.diagram figcaption {
  margin: 0;
  padding: .55rem 1.6rem .7rem;
  color: var(--muted);
  font: 500 .62rem/1.4 var(--font-mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.gallery {
  display: grid;
  gap: 1.4rem;
}
.gallery figure {
  margin: 0;
  background: var(--white);
  border: 1px solid var(--line);
}
.gallery img { display: block; width: 100%; }
.gallery figcaption {
  padding: .7rem 1rem .85rem;
  color: var(--muted);
  font: 500 .62rem/1.4 var(--font-mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.gallery h2 {
  margin: 0 0 .35rem;
  padding: 1rem 1rem 0;
  font: 500 1.35rem/1.15 var(--font-serif);
}

.site-footer {
  max-width: var(--prose);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
  color: var(--muted);
  font: 500 .62rem/1.5 var(--font-mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.site-footer a { color: var(--muted); }

/* Visual work-instruction components */
.factory {
  display: grid;
  gap: .7rem;
  margin: 0 0 1.4rem;
  padding: 1rem;
  background: var(--paper);
  border: 1px solid var(--line);
}
.factory-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .7rem;
}
.factory-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--blue);
  padding: .85rem .9rem .95rem;
  min-height: 7.2rem;
}
.factory-card .k {
  display: block;
  color: var(--blue);
  font: 500 .62rem/1.3 var(--font-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: .35rem;
}
.factory-card h3 {
  margin: 0 0 .35rem;
  font: 500 1.05rem/1.2 var(--font-serif);
  letter-spacing: -.02em;
}
.factory-card p {
  margin: 0;
  color: var(--graphite);
  font-size: .88rem;
}
.factory-flow {
  display: flex;
  align-items: stretch;
  gap: .55rem;
  flex-wrap: wrap;
}
.factory-chip {
  flex: 1 1 140px;
  background: var(--white);
  border: 1px solid var(--line);
  padding: .7rem .8rem;
  font-size: .88rem;
}
.factory-chip strong {
  display: block;
  font: 500 .62rem/1.3 var(--font-mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: .25rem;
}
.factory-note {
  margin: 0;
  color: var(--muted);
  font: 500 .68rem/1.4 var(--font-mono);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: .55rem;
  margin: 0 0 1.4rem;
}
.tl-day {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: .75rem .7rem .85rem;
  min-width: 0;
}
.tl-day .k {
  color: var(--blue);
  font: 500 .62rem/1.3 var(--font-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}
.tl-day h3 {
  margin: .15rem 0 .55rem;
  font: 500 1.05rem/1.15 var(--font-serif);
}
.tl-block {
  margin: 0 0 .45rem;
  padding: .45rem .5rem;
  background: var(--white);
  border-left: 3px solid var(--blue);
  font-size: .82rem;
  color: var(--navy-2);
}
.tl-desk, .tl-ret {
  margin: 0 0 .3rem;
  font-size: .78rem;
  color: var(--graphite);
}
.tl-desk strong, .tl-ret strong {
  display: block;
  font: 500 .58rem/1.3 var(--font-mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}

.ex-good, .ex-bad {
  margin: 0 0 1rem;
  padding: .85rem 1rem .95rem;
  background: var(--paper);
  border: 1px solid var(--line);
}
.ex-good { border-left: 4px solid var(--blue); }
.ex-bad { border-left: 4px solid var(--graphite); }
.ex-good .ex-k, .ex-bad .ex-k {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: .8rem;
  margin-bottom: .45rem;
  font: 500 .62rem/1.3 var(--font-mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}
.ex-good .ex-k { color: var(--blue); }
.ex-bad .ex-k { color: var(--graphite); }
.ex-bad .dont {
  color: #fff;
  background: var(--graphite);
  padding: .12rem .4rem;
  letter-spacing: .12em;
}
.ex-good p, .ex-bad p { margin: 0; color: var(--navy); font-size: .95rem; }
.ex-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .7rem;
  margin: 0 0 1.1rem;
}

.step {
  list-style: none;
  margin: 0 0 1.2rem;
  padding: 0;
  position: relative;
}
.step > li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: .75rem;
  margin: 0;
  padding: 0 0 1rem;
  position: relative;
}
.step > li:last-child { padding-bottom: 0; }
.step > li:not(:last-child)::before {
  content: "";
  position: absolute;
  left: .95rem;
  top: 1.7rem;
  bottom: 0;
  width: 1px;
  background: var(--line-strong);
}
.step .n {
  width: 1.9rem;
  height: 1.9rem;
  border: 1px solid var(--blue);
  background: var(--blue-wash);
  color: var(--blue);
  font: 500 .68rem/1.9rem var(--font-mono);
  text-align: center;
  position: relative;
  z-index: 1;
}
.step .s { padding-top: .15rem; }
.step .s p { margin: 0; }

.pass {
  margin: 0 0 1.2rem;
  padding: .95rem 1.05rem;
  background: var(--blue-wash);
  border: 1px solid rgba(0, 102, 255, .22);
}
.pass .k {
  margin: 0 0 .35rem;
  color: var(--blue);
  font: 500 .62rem/1.3 var(--font-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}
.pass p { margin: 0; }

.exercise {
  margin: 0 0 1.2rem;
  padding: .95rem 1.05rem;
  border: 1px dashed var(--line-strong);
  background: var(--off);
}
.exercise .k {
  margin: 0 0 .35rem;
  color: var(--navy);
  font: 500 .62rem/1.3 var(--font-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.card-x, .card-li {
  margin: 0 0 .2rem;
  background: var(--white);
  border: 1px solid var(--line);
  padding: .9rem 1rem 1rem;
  max-width: 36rem;
}
.card-x .who, .card-li .who {
  font: 600 .88rem/1.3 var(--font-body);
  margin: 0 0 .15rem;
}
.card-x .handle, .card-li .handle {
  color: var(--muted);
  font: 500 .72rem/1.3 var(--font-mono);
  margin: 0 0 .65rem;
}
.card-x .body, .card-li .body {
  margin: 0;
  white-space: pre-wrap;
  font-size: .95rem;
  color: var(--navy);
}
.card-li .body { white-space: pre-wrap; }
.card-li h4 {
  margin: .7rem 0 .25rem;
  font: 600 .88rem/1.3 var(--font-body);
}

.parked {
  margin: 0 0 1.2rem;
  padding: .85rem 1rem;
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--graphite);
}

@media (max-width: 900px) {
  .factory-row, .timeline, .ex-pair { grid-template-columns: 1fr; }
  .timeline { display: flex; flex-direction: column; }
}
@media (max-width: 640px) {
  .brand img { width: 132px; }
  .header-inner { min-height: 64px; gap: .8rem; }
  .primary-nav { gap: .75rem; }
  .prose { padding: 1.4rem 1rem 1.8rem; }
  figure.diagram { margin-left: -1rem; margin-right: -1rem; }
  figure.diagram figcaption { padding-inline: 1rem; }
  .mod-nav ol { padding-inline: 1rem; }
}