:root {
  --paper:#f4f0e6;
  --ink:#242820;
  --muted:#626657;
  --line:#d7d8c8;
  --accent:#cf542e;
  --green:#425c46;
  --blue:#316b8b;
  --gold:#d1ab45;
  --panel:#eae9dd;
  --mono:ui-monospace,SFMono-Regular,Consolas,monospace;
  --sans:Inter,Arial,sans-serif;
}

* {
  box-sizing:border-box;
}

html {
  scroll-behavior:smooth;
  scroll-padding-top:90px;
}

body {
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font:18px/1.75 var(--sans);
}

a {
  color:inherit;
  text-decoration-thickness:1px;
  text-underline-offset:4px;
}

a:hover {
  color:var(--accent);
}

:focus-visible {
  outline:3px solid var(--accent);
  outline-offset:5px;
}

::selection {
  background:#e2ce9a;
}

.skip {
  position:absolute;
  top:-90px;
  left:20px;
  z-index:5;
  padding:8px 20px;
  background:var(--paper);
}

.skip:focus {
  top:12px;
}

.topbar {
  position:sticky;
  top:0;
  z-index:4;
  background:var(--paper);
  height:72px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  border-bottom:1px solid var(--line);
  padding:0 max(5vw,20px);
}

.brand {
  font:900 23px/1 var(--sans);
  letter-spacing:-1px;
  text-decoration:none;
}

.brand span {
  color:var(--accent);
}

.toplinks {
  display:flex;
  gap:24px;
  font:12px var(--mono);
  text-transform:uppercase;
  letter-spacing:1px;
}

.wrap {
  max-width:1260px;
  margin:auto;
  padding:0 40px;
}

.hero {
  padding-top:62px;
}

.eyebrow,.section-number,.label {
  font:12px/1.5 var(--mono);
  text-transform:uppercase;
  letter-spacing:2px;
  color:var(--green);
}

.eyebrow {
  display:flex;
  align-items:center;
  gap:12px;
}

.eyebrow:before {
  content:'';
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--accent);
}

h1 {
  font:850 clamp(54px,7.1vw,100px)/.99 var(--sans);
  letter-spacing:-5px;
  margin:24px 0 28px;
  max-width:1040px;
}

h1 em {
  font-style:normal;
  color:var(--accent);
}

.hero-bottom {
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:36px;
  margin-bottom:35px;
}

.dek {
  font:21px/1.6 var(--sans);
  max-width:680px;
  margin:0;
  color:#505549;
}

.read-meta {
  font:11px/1.9 var(--mono);
  text-transform:uppercase;
  letter-spacing:1px;
  flex-shrink:0;
}

.hero-photo {
  margin:0;
}

.hero-photo img {
  display:block;
  width:100%;
  height:auto;
  max-height:620px;
  object-fit:cover;
  border-radius:3px;
}

.hero-photo figcaption {
  display:flex;
  justify-content:space-between;
  gap:15px;
  padding:12px 0;
  font:11px/1.7 var(--mono);
  color:var(--muted);
}

.specs {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  border-block:1px solid var(--line);
  margin:20px 0 64px;
  padding:22px 0;
}

.specs div {
  border-right:1px solid var(--line);
  padding-left:26px;
}

.specs div:first-child {
  padding-left:0;
}

.specs div:last-child {
  border:0;
}

.specs strong {
  display:block;
  font-size:24px;
  line-height:1.4;
}

.specs span {
  font:11px var(--mono);
  text-transform:uppercase;
  letter-spacing:1px;
  color:var(--muted);
}

.article-layout {
  display:grid;
  grid-template-columns:220px minmax(0,1fr);
  gap:65px;
}

.toc {
  position:sticky;
  top:102px;
  align-self:start;
  font:13px/1.5 var(--sans);
  padding-bottom:24px;
}

.toc .label {
  margin:0 0 20px;
}

.toc a {
  display:block;
  text-decoration:none;
  padding:8px 0;
  color:var(--muted);
}

.toc a span {
  font:11px var(--mono);
  margin-right:10px;
  color:var(--accent);
}

.toc a:hover,.toc a[aria-current] {
  color:var(--ink);
  font-weight:bold;
}

.toc .source-note {
  border-top:1px solid var(--line);
  margin-top:22px;
  padding-top:18px;
  font:11px/1.8 var(--mono);
  color:var(--muted);
}

article {
  min-width:0;
}

section {
  padding-bottom:58px;
  margin-bottom:40px;
  border-bottom:1px solid var(--line);
}

h2 {
  font:750 clamp(30px,3.3vw,43px)/1.15 var(--sans);
  letter-spacing:-1.5px;
  margin:12px 0 25px;
}

h3 {
  font:700 24px/1.3 var(--sans);
  letter-spacing:-.5px;
  margin:32px 0 13px;
}

p {
  margin:0 0 21px;
}

article p,article li {
  max-width:78ch;
}

.lead {
  font-size:22px;
  line-height:1.6;
}

.note {
  border-left:3px solid var(--accent);
  background:#ece5d7;
  padding:19px 23px;
  margin:28px 0;
  font-size:16px;
}

.note p:last-child {
  margin:0;
}

.note strong {
  color:#953e24;
}

.diagram {
  margin:30px 0;
  background:#faf8f1;
  border:1px solid var(--line);
  border-radius:5px;
  overflow:hidden;
}

.diagram img {
  display:block;
  width:100%;
  height:auto;
}

.diagram figcaption {
  padding:13px 20px;
  border-top:1px solid var(--line);
  font:12px/1.7 var(--mono);
  color:var(--muted);
}

.diagram figcaption a {
  float:right;
  margin-left:15px;
}

.table-scroll {
  overflow-x:auto;
  margin:24px 0;
}

table {
  border-collapse:collapse;
  width:100%;
  font-size:15px;
  line-height:1.65;
}

th {
  font:11px var(--mono);
  text-transform:uppercase;
  letter-spacing:1px;
  text-align:left;
  background:var(--panel);
}

th,td {
  padding:13px 14px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}

td:first-child {
  font-weight:600;
}

code {
  font: .85em var(--mono);
  background:#e6e5d9;
  padding:2px 5px;
  overflow-wrap:anywhere;
}

pre {
  background:#242c26;
  color:#f1f1df;
  padding:23px;
  overflow:auto;
  border-radius:4px;
  font:14px/1.85 var(--mono);
}

pre code {
  background:none;
  padding:0;
  color:inherit;
  overflow-wrap:normal;
}

.steps {
  padding-left:25px;
}

.steps li {
  padding-left:8px;
  margin-bottom:17px;
}

.steps li::marker {
  font-weight:bold;
  color:var(--accent);
}

.video {
  aspect-ratio:16/9;
  background:#242820;
  position:relative;
  border-radius:4px;
  overflow:hidden;
  margin:28px 0 10px;
}

.video iframe {
  border:0;
  width:100%;
  height:100%;
}

.small {
  font-size:14px;
  color:var(--muted);
}

.timeline {
  border-left:1px solid var(--line);
  padding-left:26px;
  margin:32px 0;
}

.milestone {
  position:relative;
  margin:0 0 24px;
}

.milestone:before {
  content:'';
  position:absolute;
  width:9px;
  height:9px;
  background:var(--accent);
  border-radius:50%;
  left:-31px;
  top:9px;
}

.milestone .date {
  font:11px var(--mono);
  color:var(--muted);
}

.milestone p {
  font-size:16px;
  margin:6px 0;
}

.milestone a {
  font:12px var(--mono);
}

.lab {
  padding:25px;
  border:1px solid var(--line);
  background:#faf8f1;
  border-radius:5px;
  margin:26px 0;
}

.lab h3 {
  margin-top:6px;
}

.lab svg {
  width:100%;
  height:auto;
  display:block;
}

.lab-controls {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:25px;
}

.lab label {
  font:13px var(--mono);
}

.lab input {
  width:100%;
  accent-color:var(--accent);
  margin:16px 0;
}

.lab output {
  color:var(--accent);
  font:700 25px var(--mono);
}

.lab .small {
  margin:12px 0 0;
}

.lab[hidden] {
  display:none;
}

.cards {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:15px;
  margin:25px 0;
}

.card {
  border:1px solid var(--line);
  padding:20px;
}

.card h3 {
  font-size:20px;
  margin:0 0 12px;
}

.card p {
  font-size:15px;
  margin:0;
}

.source-list {
  padding-left:20px;
  font-size:15px;
}

.source-list li {
  margin-bottom:12px;
}

.closing {
  font-size:25px;
  line-height:1.5;
}

.footer {
  border-top:1px solid var(--line);
  padding:30px 0 50px;
  margin-top:30px;
  display:flex;
  justify-content:space-between;
  font:12px var(--mono);
}

@media(min-width:1500px) {
  .wrap {
    max-width:1380px;
  }
  .article-layout {
    gap:90px;
  }
}

@media(max-width:950px) {
  .article-layout {
    grid-template-columns:160px minmax(0,1fr);
    gap:30px;
  }
  .wrap {
    padding:0 25px;
  }
  .hero-bottom {
    align-items:flex-start;
  }
  .read-meta {
    display:none;
  }
  h1 {
    letter-spacing:-3px;
  }
  .specs strong {
    font-size:21px;
  }
}

@media(max-width:700px) {
  body {
    font-size:17px;
  }
  .topbar {
    height:62px;
  }
  .toplinks {
    gap:15px;
    font-size:10px;
  }
  .wrap {
    padding:0 20px;
  }
  .hero {
    padding-top:35px;
  }
  h1 {
    font-size:58px;
    letter-spacing:-3px;
  }
  .dek {
    font-size:18px;
  }
  .hero-photo img {
    max-height:none;
  }
  .hero-photo figcaption {
    display:block;
  }
  .hero-photo figcaption span {
    display:block;
  }
  .specs {
    grid-template-columns:1fr 1fr;
    gap:22px;
    margin-bottom:38px;
  }
  .specs div:nth-child(3) {
    padding-left:0;
  }
  .specs div:nth-child(2) {
    border:0;
  }
  .article-layout {
    display:block;
  }
  .toc {
    position:static;
    border-bottom:1px solid var(--line);
    margin-bottom:35px;
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:0 10px;
  }
  .toc .label {
    grid-column:1/-1;
    margin-bottom:12px;
  }
  .toc .source-note {
    display:none;
  }
  section {
    padding-bottom:32px;
    margin-bottom:30px;
  }
  .diagram {
    margin-inline:-8px;
  }
  .diagram figcaption a {
    float:none;
    display:block;
    margin:4px 0 0;
  }
  .cards,.lab-controls {
    grid-template-columns:1fr;
  }
  .lab {
    padding:15px;
  }
  .footer {
    gap:20px;
    line-height:1.6;
  }
  .lead {
    font-size:20px;
  }
  th,td {
    padding:10px;
    font-size:14px;
  }
}

@media(prefers-reduced-motion:reduce) {
  html {
    scroll-behavior:auto;
  }
}

@media print {
  body {
    font-size:11pt;
    background:white;
  }
  .topbar,.toc,.video,.lab,.skip,.toplinks {
    display:none;
  }
  .wrap {
    padding:0;
    max-width:none;
  }
  .article-layout {
    display:block;
  }
  .hero {
    padding:0;
  }
  h1 {
    font-size:45pt;
  }
  .hero-photo img {
    max-height:350px;
    object-fit:contain;
  }
  .specs {
    margin-bottom:25px;
  }
  section {
    padding-bottom:20px;
    margin-bottom:20px;
  }
  .diagram,pre,tr,.card {
    break-inside:avoid;
  }
  h2,h3 {
    break-after:avoid;
  }
  a {
    color:inherit;
  }
  pre {
    white-space:pre-wrap;
  }
  .footer {
    margin:0;
  }
}