:root{
  --bg:#151b2b;
  --bg-alt:#1c2436;
  --paper:#eee8dc;
  --ink:#e4e0d4;
  --muted:#8a93a5;
  --accent:#c98a4c;
  --accent2:#7fa3b8;
  --pad:56px;
  --rhythm:88px;
}

*{box-sizing:border-box;}

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

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  font-size:17px;
  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 ---------- */

.page{
  padding:40px 40px 0;
  max-width:1280px;
  margin:0 auto;
}

.topbar{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:14px 28px;
  padding-bottom:22px;
}

.brand{
  font-size:20px;
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--ink);
  text-decoration:none;
}
.brand span{
  display:block;
  font-size:12px;
  font-weight:400;
  letter-spacing:.02em;
  color:var(--accent2);
}

.mainnav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:6px 22px;
}
.mainnav a{
  color:var(--ink);
  text-decoration:none;
  font-size:15px;
  padding-bottom:3px;
  border-bottom:1px solid transparent;
}
.mainnav a:hover{border-bottom-color:var(--accent);}
.mainnav a[aria-current="page"]{border-bottom-color:var(--accent);color:var(--accent);}

.sheet{
  background:var(--bg-alt);
  border:1px solid rgba(201,138,76,.45);
  padding:var(--pad);
}

/* ---------- grid ---------- */

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

.block + .block{margin-top:var(--rhythm);}

.col-text{grid-column:1 / span 7;}
.col-side{grid-column:9 / span 4;}
.col-img{grid-column:1 / span 5;}
.col-cap{grid-column:7 / span 4;align-self:end;}

/* ---------- typography ---------- */

h1{
  grid-column:1 / span 8;
  margin:0;
  font-size:clamp(34px,5.4vw,64px);
  line-height:1.04;
  font-weight:700;
  letter-spacing:-.035em;
  max-width:14ch;
}

h2{
  font-size:clamp(23px,2.4vw,30px);
  line-height:1.22;
  font-weight:600;
  letter-spacing:-.015em;
  margin:0 0 18px;
}

h3{
  font-size:19px;
  font-weight:600;
  margin:30px 0 10px;
}

p{margin:0 0 18px;max-width:72ch;}
p:last-child{margin-bottom:0;}

.lead{font-size:19px;}

.secnum{
  display:block;
  font-size:13px;
  letter-spacing:.06em;
  color:var(--accent2);
  margin-bottom:10px;
}

.caption{
  font-size:13px;
  line-height:1.55;
  color:var(--muted);
  margin:10px 0 0;
  max-width:40ch;
}

/* ---------- data tables (side notes) ---------- */

.note{
  border:1px solid rgba(127,163,184,.4);
  padding:18px 20px;
  font-size:14px;
  line-height:1.6;
  color:var(--muted);
}
.note h3,
.note .note-title{
  margin:0 0 12px;
  font-size:14px;
  font-weight:600;
  color:var(--ink);
  letter-spacing:.01em;
}
.note dl{margin:0;}
.note dt{
  color:var(--ink);
  font-weight:600;
  font-size:14px;
}
.note dd{
  margin:0 0 12px;
  padding-bottom:12px;
  border-bottom:1px solid rgba(127,163,184,.22);
}
.note dd:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none;}
.note ul{margin:0;padding-left:18px;}
.note li{margin-bottom:7px;}
.note li:last-child{margin-bottom:0;}
.note a{color:var(--accent);}

.note-stack{grid-column:9 / span 4;display:flex;flex-direction:column;gap:22px;}

/* ---------- lists ---------- */

ul.checklist,
ol.steps{
  margin:0 0 18px;
  padding-left:22px;
  max-width:68ch;
}
ul.checklist{list-style:none;padding-left:0;}
ul.checklist li{
  position:relative;
  padding-left:24px;
  margin-bottom:11px;
}
ul.checklist li::before{
  content:"";
  position:absolute;
  left:0;
  top:.62em;
  width:10px;
  height:1px;
  background:var(--accent);
}
ol.steps li{margin-bottom:11px;padding-left:4px;}
ol.steps li::marker{color:var(--accent);font-variant-numeric:tabular-nums;}

/* ---------- separators ---------- */

.rule{
  grid-column:1 / -1;
  position:relative;
  height:1px;
  background:rgba(138,147,165,.35);
  margin:var(--rhythm) 0 0;
}
.rule::before,
.rule::after{
  content:"";
  position:absolute;
  top:-5px;
  width:1px;
  height:11px;
  background:var(--accent);
}
.rule::before{left:0;}
.rule::after{right:0;}
.rule + .block{margin-top:var(--rhythm);}

.rule-note{
  margin:calc(var(--rhythm) - 10px) 0 0;
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:28px;
  align-items:start;
}
.rule-note .line{
  grid-column:1 / span 7;
  position:relative;
  height:1px;
  background:rgba(138,147,165,.35);
  margin-top:26px;
}
.rule-note .line::before,
.rule-note .line::after{
  content:"";
  position:absolute;
  top:-5px;
  width:1px;
  height:11px;
  background:var(--accent);
}
.rule-note .line::before{left:0;}
.rule-note .line::after{right:0;}
.rule-note .note{grid-column:9 / span 4;}

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

.hero .h1wrap{grid-column:1 / span 8;}
.hero .note{grid-column:9 / span 4;}
.hero p.lead{grid-column:1 / span 7;margin-top:26px;}

.figure-main{grid-column:1 / span 5;}
.figure-main img{
  border:1px solid rgba(228,224,212,.28);
  width:100%;
}

/* ---------- contrast section ---------- */

.paper{
  background:var(--paper);
  color:var(--bg);
  margin:var(--rhythm) calc(var(--pad) * -1) 0;
  padding:var(--pad);
}
.paper h2,
.paper h3{color:var(--bg);}
.paper .caption{color:#5b5a52;}
.paper a{color:#8a5520;}
.paper .figure-detail{grid-column:2 / span 4;}
.paper .figure-detail img{border:1px solid rgba(21,27,43,.28);width:100%;}
.paper .paper-text{grid-column:7 / span 6;}
.paper .note{border-color:rgba(21,27,43,.28);color:#4d4c45;}
.paper .note .note-title,
.paper .note dt{color:var(--bg);}
.paper ul.checklist li::before{background:#8a5520;}

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

.sitefoot{
  max-width:1280px;
  margin:0 auto;
  padding:46px 40px 56px;
}
.foot-top{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:baseline;
  gap:10px 24px;
  font-size:17px;
}
.foot-top .fname{font-weight:700;letter-spacing:-.01em;}
.foot-line{
  height:1px;
  background:rgba(138,147,165,.3);
  margin:18px 0 20px;
}
.foot-bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:16px 32px;
}
.foot-bottom nav ul{
  list-style:none;margin:0;padding:0;
  display:flex;flex-wrap:wrap;gap:6px 20px;
}
.foot-bottom a{color:var(--ink);text-decoration:none;font-size:15px;border-bottom:1px solid transparent;}
.foot-bottom a:hover{border-bottom-color:var(--accent);}
.foot-note{
  font-size:13px;
  color:var(--muted);
  max-width:48ch;
  margin:0;
}

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

@media (max-width:1000px){
  :root{--pad:36px;--rhythm:64px;}
  .col-text,.hero p.lead,.rule-note .line{grid-column:1 / span 8;}
  .col-side,.note-stack,.hero .note,.rule-note .note{grid-column:9 / span 4;}
  .figure-main{grid-column:1 / span 6;}
  .col-img{grid-column:1 / span 6;}
  .col-cap{grid-column:8 / span 5;}
  .paper .figure-detail{grid-column:1 / span 5;}
  .paper .paper-text{grid-column:7 / span 6;}
}

@media (max-width:760px){
  :root{--pad:20px;--rhythm:52px;}
  body{font-size:16px;}
  .page{padding:22px 16px 0;}
  .sitefoot{padding:34px 16px 40px;}
  .grid{grid-template-columns:1fr;gap:22px;}
  h1,
  .hero .h1wrap,.hero .note,.hero p.lead,
  .col-text,.col-side,.col-img,.col-cap,
  .note-stack,.figure-main,
  .paper .figure-detail,.paper .paper-text,
  .rule-note .line,.rule-note .note{grid-column:1 / -1;}
  h1{max-width:none;}
  .rule-note{grid-template-columns:1fr;gap:22px;}
  .rule-note .line{margin-top:0;}
  .figure-main,.paper .figure-detail{max-width:420px;}
  .caption{max-width:none;}
}

.after-figure{margin-top:34px;}
@media (max-width:760px){.after-figure{margin-top:0;}}