/* Bervase — rail-scale */

:root{
  --paper:#f4f2ed;
  --paper-alt:#e6e3dc;
  --ink:#16151a;
  --ink-soft:#6d6a63;
  --blue:#1f3fa8;
  --red:#c0452e;
  --step:80px;
  --gap:24px;
}

*{box-sizing:border-box;}

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

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:system-ui,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:18px;
  line-height:1.9;
  overflow-x:hidden;
}

h1,h2,h3{
  font-family:Georgia,"Times New Roman",serif;
  font-weight:400;
  line-height:1.3;
  letter-spacing:-0.005em;
  margin:0;
}

h1{font-size:2.5rem;}
h2{font-size:1.7rem;}
h3{font-size:1.2rem;}

p{margin:0 0 1.5em;}
p:last-child{margin-bottom:0;}

a{color:var(--blue);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}
a:hover{text-decoration-thickness:2px;}
a:focus-visible{outline:2px solid var(--blue);outline-offset:3px;background:#dfe4f5;}

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

.grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:0 var(--gap);
  max-width:1240px;
  margin:0 auto;
  padding:0 28px;
}

.rail{
  grid-column:1 / span 2;
  color:var(--ink-soft);
  font-size:14px;
  line-height:1.5;
}

.rail .rail-num{
  color:var(--red);
  display:block;
  font-variant-numeric:tabular-nums;
  margin-bottom:8px;
}

.rail .rail-label{display:block;}

/* CSS-only tick scale */
.ticks{
  margin-top:14px;
  height:120px;
  background-image:repeating-linear-gradient(to bottom,var(--ink) 0 1px,transparent 1px 12px);
  width:18px;
  opacity:.45;
}
.ticks-long{height:220px;}

.body-col{grid-column:3 / span 7;}
.wide-col{grid-column:3 / span 9;}

/* ---------- header ---------- */

.site-header{
  border-bottom:1px solid #cdc9c0;
  background:var(--paper);
}

.site-header .grid{
  padding-top:20px;
  padding-bottom:20px;
  align-items:baseline;
}

.brand{
  grid-column:1 / span 3;
  font-family:Georgia,"Times New Roman",serif;
  font-size:1.25rem;
  color:var(--ink);
  text-decoration:none;
  letter-spacing:0.02em;
}
.brand:hover{text-decoration:none;color:var(--blue);}

.site-nav{grid-column:5 / span 8;}

.site-nav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:8px 26px;
  justify-content:flex-end;
  font-size:15px;
}

.site-nav a{color:var(--ink);text-decoration:none;padding-bottom:2px;border-bottom:1px solid transparent;}
.site-nav a:hover{border-bottom-color:var(--blue);color:var(--blue);}
.site-nav a[aria-current="page"]{border-bottom-color:var(--red);}

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

.hero{padding:calc(var(--step) - 16px) 0 var(--step);}

.hero h1{
  grid-column:3 / span 8;
  font-size:clamp(2rem,5.2vw,3.1rem);
  max-width:16ch;
  margin-bottom:28px;
}

.hero-lead{
  grid-column:3 / span 6;
  color:var(--ink);
}

.hero-lead .meta{
  color:var(--ink-soft);
  font-size:14px;
  line-height:1.6;
  margin-top:26px;
}

/* ---------- sections ---------- */

section{padding:var(--step) 0;}

.band{background:var(--paper-alt);}

.dark{
  background:var(--ink);
  color:var(--paper);
}
.dark h2,.dark h3{color:var(--paper);}
.dark .rail{color:#a29e96;}
.dark .rail .rail-num{color:var(--red);}
.dark .ticks{background-image:repeating-linear-gradient(to bottom,var(--paper) 0 1px,transparent 1px 12px);opacity:.35;}
.dark a{color:#9fb3f0;}
.dark a:focus-visible{outline-color:#9fb3f0;background:#2a2833;}

.section-head{margin-bottom:34px;}

h2{margin-bottom:22px;}
h3{margin:34px 0 12px;}

.note{
  color:var(--ink-soft);
  font-size:14px;
  line-height:1.7;
}

/* short vertical stroke separators */
.strokes{
  display:flex;
  gap:10px;
  margin:38px 0;
}
.strokes span{
  display:block;
  width:1px;
  height:24px;
  background:var(--red);
  opacity:.7;
}
.dark .strokes span{background:var(--red);opacity:.9;}

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

ul.checks,ol.steps{
  grid-column:3 / span 9;
  margin:0;
  padding:0;
}

ul.checks{
  list-style:none;
  columns:2;
  column-gap:48px;
}

ul.checks li{
  break-inside:avoid;
  padding-left:20px;
  position:relative;
  margin-bottom:16px;
  line-height:1.75;
}
ul.checks li::before{
  content:"";
  position:absolute;
  left:0;
  top:0.72em;
  width:9px;
  height:1px;
  background:var(--blue);
}

ol.steps{
  list-style:none;
  counter-reset:s;
}
ol.steps li{
  counter-increment:s;
  padding-left:44px;
  position:relative;
  margin-bottom:22px;
  line-height:1.8;
}
ol.steps li::before{
  content:counter(s,decimal-leading-zero);
  position:absolute;
  left:0;
  top:0;
  color:var(--red);
  font-size:14px;
  font-variant-numeric:tabular-nums;
  line-height:2.4;
}

/* ---------- figures ---------- */

.figure-main{
  grid-column:4 / span 9;
  margin:0;
}
.figure-main img{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:16/9;
  object-fit:cover;
}
.figure-caption{
  grid-column:1 / span 2;
  align-self:end;
  color:var(--ink-soft);
  font-size:14px;
  line-height:1.6;
  padding-bottom:4px;
}

.detail-figure{
  grid-column:2 / span 4;
  margin:0;
}
.detail-figure img{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:4/5;
  object-fit:cover;
}
.detail-figure figcaption{
  color:#a29e96;
  font-size:14px;
  line-height:1.6;
  margin-top:12px;
}
.detail-text{grid-column:7 / span 6;}

/* ---------- tables of values in text ---------- */

dl.pairs{
  grid-column:3 / span 9;
  margin:0;
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:0 48px;
}
dl.pairs dt{
  font-family:Georgia,"Times New Roman",serif;
  font-size:1.05rem;
  border-top:1px solid #cdc9c0;
  padding-top:14px;
  margin-top:22px;
}
.dark dl.pairs dt{border-top-color:#3a3841;}
dl.pairs dd{
  margin:6px 0 0;
  line-height:1.8;
}

/* ---------- about ---------- */

.page-head{padding:calc(var(--step) - 24px) 0 40px;}
.page-head h1{
  grid-column:3 / span 8;
  font-size:clamp(1.9rem,4vw,2.6rem);
  max-width:20ch;
}

.prose{grid-column:3 / span 7;}
.prose h2{margin-top:0;}
.prose section{padding:0;}

.doc-block{padding:0 0 var(--step);}
.doc-block + .doc-block{padding-top:0;}

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

.site-footer{
  border-top:1px solid #cdc9c0;
  padding:34px 0 44px;
  background:var(--paper);
}

.footer-bay{
  grid-column:1 / span 12;
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:20px 32px;
  flex-wrap:wrap;
}
.footer-name{
  font-family:Georgia,"Times New Roman",serif;
  font-size:1.1rem;
}
.footer-links{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:6px 24px;
  margin:0;
  padding:0;
  font-size:15px;
}
.footer-links a{color:var(--ink);text-decoration:none;border-bottom:1px solid #cdc9c0;}
.footer-links a:hover{color:var(--blue);border-bottom-color:var(--blue);}
.footer-mail{font-size:15px;}
.footer-rule{
  grid-column:1 / span 12;
  height:1px;
  background:#cdc9c0;
  margin:26px 0 14px;
}
.footer-fine{
  grid-column:1 / span 12;
  color:var(--ink-soft);
  font-size:14px;
  line-height:1.7;
}

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

@media (max-width:1000px){
  .hero h1,.hero-lead,.body-col,.wide-col,.prose,.page-head h1,
  ul.checks,ol.steps,dl.pairs,.detail-text{grid-column:2 / span 11;}
  .figure-main{grid-column:2 / span 11;}
  .figure-caption{grid-column:2 / span 11;margin-bottom:12px;}
  .detail-figure{grid-column:2 / span 6;}
}

@media (max-width:720px){
  :root{--step:48px;--gap:16px;}
  body{font-size:17px;line-height:1.8;}
  .grid{padding:0 20px;}
  .rail{grid-column:1 / span 12;margin-bottom:14px;}
  .rail .rail-num{display:inline;margin-right:10px;margin-bottom:0;}
  .rail .rail-label{display:inline;}
  .ticks{display:none;}
  .hero h1,.hero-lead,.body-col,.wide-col,.prose,.page-head h1,
  ul.checks,ol.steps,dl.pairs,.detail-text,
  .figure-main,.figure-caption,.detail-figure{grid-column:1 / span 12;}
  ul.checks{columns:1;}
  dl.pairs{grid-template-columns:1fr;}
  .detail-figure{margin-bottom:28px;}
  .brand{grid-column:1 / span 12;margin-bottom:10px;}
  .site-nav{grid-column:1 / span 12;}
  .site-nav ul{justify-content:flex-start;gap:8px 18px;}
  .footer-bay{flex-direction:column;align-items:flex-start;}
}