:root{
  --paper:#f5f0df;
  --paper-alt:#e9e1c9;
  --dark:#2f2a1e;
  --ink:#241f16;
  --muted:#736b55;
  --accent:#8a6a1f;
  --accent2:#4a6b52;
  --line:#c9bf9f;
  --sans:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --serif:Georgia,'Times New Roman',serif;
}

*{box-sizing:border-box;}

html{-webkit-text-size-adjust:100%;}

body{
  margin:0;
  background:var(--paper-alt);
  color:var(--ink);
  font-family:var(--serif);
  font-size:18px;
  line-height:1.7;
  overflow-x:hidden;
}

img{max-width:100%;height:auto;display:block;}

a{color:var(--accent);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}
a:hover{text-decoration-thickness:2px;}
a:focus-visible,
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;}

/* ---------- shell ---------- */

.shell{
  max-width:1180px;
  margin:0 auto;
  padding:40px 24px 0;
}

.sheet{
  background:var(--paper);
  border:1px solid var(--line);
  padding:40px;
}

.grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:28px;
}

/* ---------- masthead ---------- */

.masthead{
  grid-column:1 / -1;
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:16px 28px;
  border-bottom:1px solid var(--line);
  padding-bottom:18px;
}

.wordmark{
  font-family:var(--sans);
  font-weight:800;
  letter-spacing:-0.02em;
  font-size:22px;
  text-transform:uppercase;
  color:var(--ink);
  text-decoration:none;
}
.wordmark span{color:var(--accent2);font-weight:600;}

.nav ul{
  list-style:none;
  margin:0;padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:6px 22px;
  font-family:var(--sans);
  font-size:14px;
  letter-spacing:0.04em;
  text-transform:uppercase;
}
.nav a{color:var(--ink);text-decoration:none;padding-bottom:2px;border-bottom:1px solid transparent;}
.nav a:hover{border-bottom-color:var(--accent);}
.nav a[aria-current="page"]{border-bottom-color:var(--accent);color:var(--accent);}

/* ---------- hero ---------- */

.hero{
  grid-column:1 / -1;
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:28px;
  padding-top:44px;
}

.hero-head{grid-column:1 / span 8;}

h1{
  font-family:var(--sans);
  font-weight:800;
  font-size:clamp(34px,5.2vw,60px);
  line-height:0.98;
  letter-spacing:-0.035em;
  margin:0 0 22px;
  text-wrap:balance;
}

.kicker{
  font-family:var(--sans);
  font-size:12px;
  letter-spacing:0.18em;
  text-transform:uppercase;
  color:var(--accent2);
  margin:0 0 18px;
}

.lede{font-size:20px;margin:0;max-width:60ch;}

.datasheet{
  grid-column:9 / span 4;
  border:1px solid var(--line);
  padding:16px 18px;
  align-self:start;
  font-family:var(--sans);
  font-size:13.5px;
  line-height:1.55;
}
.datasheet dl{margin:0;}
.datasheet dt{
  font-size:11px;letter-spacing:0.14em;text-transform:uppercase;
  color:var(--accent2);margin-top:12px;
}
.datasheet dt:first-child{margin-top:0;}
.datasheet dd{margin:2px 0 0;color:var(--ink);}

/* ---------- rule ---------- */

.rule{
  grid-column:1 / -1;
  position:relative;
  height:1px;
  background:var(--line);
  margin:88px 0;
  border:0;
}
.rule::before,.rule::after{
  content:"";
  position:absolute;top:-5px;
  width:1px;height:11px;background:var(--accent2);
}
.rule::before{left:0;}
.rule::after{right:0;}

/* ---------- figure ---------- */

.figure-row{grid-column:1 / -1;display:grid;grid-template-columns:repeat(12,1fr);gap:28px;align-items:start;}
.figure-main{grid-column:1 / span 5;}
.figure-main img{border:1px solid var(--line);width:100%;}
.figure-note{grid-column:7 / span 5;}
.figure-note p:first-child{margin-top:0;}

figcaption{
  font-family:var(--sans);
  font-size:12.5px;
  line-height:1.5;
  color:var(--muted);
  margin-top:10px;
  border-top:1px solid var(--line);
  padding-top:8px;
}

/* ---------- text blocks ---------- */

.block{grid-column:1 / span 7;}
.side{grid-column:9 / span 4;align-self:start;}
.full{grid-column:1 / -1;}

h2{
  font-family:var(--sans);
  font-weight:800;
  font-size:clamp(24px,3vw,32px);
  line-height:1.08;
  letter-spacing:-0.02em;
  margin:0 0 16px;
}
h2 .num{
  display:block;
  font-size:11px;
  font-weight:600;
  letter-spacing:0.18em;
  color:var(--accent2);
  margin-bottom:8px;
}

h3{
  font-family:var(--sans);
  font-weight:700;
  font-size:18px;
  letter-spacing:-0.01em;
  margin:30px 0 8px;
}

p{margin:0 0 18px;}
p:last-child{margin-bottom:0;}

.note{
  border:1px solid var(--line);
  padding:16px 18px;
  font-family:var(--sans);
  font-size:14px;
  line-height:1.6;
}
.note h3{margin:0 0 8px;font-size:13px;letter-spacing:0.12em;text-transform:uppercase;color:var(--accent2);}
.note ul{margin:0;padding-left:18px;}
.note li{margin-bottom:6px;}
.note li::marker{color:var(--accent);}

ul.checks{list-style:none;margin:0 0 18px;padding:0;}
ul.checks li{
  position:relative;
  padding-left:26px;
  margin-bottom:10px;
}
ul.checks li::before{
  content:"";
  position:absolute;left:0;top:12px;
  width:12px;height:1px;background:var(--accent);
}

ol.steps{margin:0 0 18px;padding-left:22px;}
ol.steps li{margin-bottom:10px;}
ol.steps li::marker{font-family:var(--sans);font-weight:700;color:var(--accent2);}

/* ---------- dark section ---------- */

.dark{
  grid-column:1 / -1;
  background:var(--dark);
  color:var(--paper);
  padding:56px 40px;
  margin:88px -40px;
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:28px;
  align-items:center;
}
.dark h2{color:var(--paper);}
.dark h2 .num,.dark .kicker{color:#b9c9ae;}
.dark a{color:#e0c98a;}
.dark figcaption{color:#b0a88e;border-top-color:#544c39;}
.dark .figure-detail{grid-column:1 / span 4;}
.dark .figure-detail img{border:1px solid #574f3a;width:100%;}
.dark .dark-text{grid-column:6 / span 6;}
.dark .dark-text ul.checks li::before{background:#e0c98a;}

/* ---------- footer ---------- */

.site-footer{
  max-width:1180px;
  margin:0 auto;
  padding:56px 24px 48px;
  font-family:var(--sans);
}
.footer-top{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px 28px;
  align-items:baseline;
}
.footer-top .fname{font-weight:800;letter-spacing:-0.02em;font-size:20px;text-transform:uppercase;}
.footer-top a{font-size:15px;}
.footer-line{height:1px;background:var(--line);margin:18px 0;}
.footer-nav ul{
  list-style:none;margin:0 0 14px;padding:0;
  display:flex;flex-wrap:wrap;gap:6px 22px;
  font-size:14px;letter-spacing:0.03em;
}
.footer-nav a{color:var(--ink);text-decoration:none;border-bottom:1px solid transparent;}
.footer-nav a:hover{border-bottom-color:var(--accent);}
.footer-note{font-size:13px;color:var(--muted);max-width:70ch;margin:0;line-height:1.6;}

/* ---------- responsive ---------- */

@media (max-width:900px){
  .hero-head,.datasheet,.block,.side,.figure-main,.figure-note,
  .dark .figure-detail,.dark .dark-text{grid-column:1 / -1;}
  .figure-main{max-width:420px;}
  .dark .figure-detail{max-width:380px;}
}

@media (max-width:640px){
  body{font-size:17px;}
  .shell{padding:20px 16px 0;}
  .sheet{padding:22px 18px;}
  .grid,.hero,.figure-row,.dark{gap:22px;}
  .rule{margin:52px 0;}
  .dark{margin:52px -18px;padding:38px 18px;}
  .hero{padding-top:28px;}
  .lede{font-size:18px;}
  .site-footer{padding:36px 16px 40px;}
  .nav ul{gap:6px 16px;font-size:13px;}
}