/* Pilastroveno — book-spine */

:root{
  --bg:#fbf9f5;
  --bg-alt:#e4e8e1;
  --bg-dark:#223129;
  --ink:#22201c;
  --ink-soft:#797468;
  --ink-inv:#fbf9f5;
  --accent:#54684e;
  --accent2:#a87c48;
  --serif:Georgia,'Times New Roman',serif;
  --sans:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --rhythm:76px;
}

*,*::before,*::after{box-sizing:border-box;}

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

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.8;
  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;}

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

.shell{
  max-width:1180px;
  margin:0 auto;
  padding:0 20px;
  display:grid;
  grid-template-columns:repeat(12,1fr);
  column-gap:22px;
}

/* the spine occupies column 1 on every band */
.spine{
  grid-column:1 / 2;
  display:flex;
  flex-direction:column;
  gap:9px;
  padding-top:12px;
  align-items:flex-start;
}
.spine span{
  display:block;
  width:20px;
  height:2px;
  background:var(--accent);
  opacity:.72;
}
.spine span:nth-child(3n){width:12px;background:var(--accent2);}

.col-main{grid-column:2 / 9;}
.col-wide{grid-column:2 / 11;}
.col-full{grid-column:2 / 13;}

/* ---------- section rhythm ---------- */

.band{padding:var(--rhythm) 0;}
.band + .band{padding-top:var(--rhythm);}
.band-alt{background:var(--bg-alt);}
.band-dark{background:var(--bg-dark);color:var(--ink-inv);}
.band-dark a{color:#cbd6c4;}
.band-dark .kicker{color:#a9b3a4;}
.band-dark .kicker::after{background:rgba(251,249,245,.28);}
.band-dark .caption{color:#a9b3a4;}

.kicker{
  grid-column:2 / 13;
  font-size:13px;
  letter-spacing:.06em;
  color:var(--ink-soft);
  margin:0 0 26px;
}
.kicker .num{color:var(--accent2);margin-right:10px;}
.kicker::after{
  content:"";
  display:block;
  height:1px;
  background:rgba(34,32,28,.18);
  margin-top:10px;
}

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

.masthead{border-bottom:1px solid rgba(34,32,28,.14);background:var(--bg);}
.masthead .shell{padding-top:22px;padding-bottom:20px;align-items:baseline;}
.brand{
  grid-column:1 / 5;
  font-family:var(--serif);
  font-size:23px;
  letter-spacing:.02em;
  color:var(--ink);
  text-decoration:none;
}
.brand:hover{color:var(--accent);}
.masthead nav{grid-column:5 / 13;}
.masthead ul{
  list-style:none;margin:0;padding:0;
  display:flex;flex-wrap:wrap;gap:8px 26px;justify-content:flex-end;
}
.masthead a:not(.brand){
  font-size:15px;color:var(--ink-soft);text-decoration:none;
  padding-bottom:2px;border-bottom:1px solid transparent;
}
.masthead a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--accent);}
.masthead a:not(.brand):hover{color:var(--accent);border-bottom-color:var(--accent);}

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

.hero{padding:78px 0 var(--rhythm);}
.hero .spine{grid-row:1 / span 3;padding-top:16px;}
.hero .spine span{width:26px;}

h1{
  grid-column:2 / 11;
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(34px,5.1vw,58px);
  line-height:1.05;
  letter-spacing:-.01em;
  margin:0 0 22px;
  max-width:15ch;
}
.rule2{
  grid-column:2 / 9;
  border:0;margin:0 0 22px;
  border-top:1px solid var(--ink);
  border-bottom:1px solid rgba(34,32,28,.28);
  height:4px;
}
.lede{
  grid-column:2 / 10;
  font-size:20px;
  line-height:1.65;
  margin:0;
  color:#3a382f;
}

.figure-main{grid-column:7 / 13;margin:44px 0 0;}
.figure-main img{width:100%;}
.caption{
  font-size:13px;
  line-height:1.55;
  color:var(--ink-soft);
  margin-top:10px;
  text-align:left;
}

/* ---------- body content ---------- */

h2{
  grid-column:2 / 10;
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(24px,2.6vw,31px);
  line-height:1.18;
  margin:0 0 18px;
}
h3{
  grid-column:2 / 9;
  font-family:var(--serif);
  font-weight:400;
  font-size:20px;
  line-height:1.3;
  margin:34px 0 10px;
}
.band p,
.band ul,
.band ol{grid-column:2 / 9;}
.band p{margin:0 0 20px;}
.intro{grid-column:2 / 10;font-size:19px;line-height:1.7;}

ul,ol{margin:0 0 22px;padding-left:22px;}
li{margin-bottom:9px;}
li::marker{color:var(--accent);}

.checklist{list-style:none;padding-left:0;}
.checklist li{
  position:relative;
  padding-left:26px;
}
.checklist li::before{
  content:"";
  position:absolute;left:0;top:.85em;
  width:14px;height:2px;background:var(--accent);
}

.dl{grid-column:2 / 9;margin:0 0 22px;}
.dl dt{font-family:var(--serif);font-size:19px;margin-top:22px;}
.dl dd{margin:6px 0 0;}

.sep{
  grid-column:2 / 13;
  display:flex;justify-content:center;gap:9px;
  margin:44px 0;
}
.sep span{width:16px;height:2px;background:var(--accent2);display:block;}

/* dark detail band */
.band-dark .figure-detail{grid-column:2 / 6;margin:0;}
.band-dark .detail-text{grid-column:7 / 13;}
.band-dark .detail-text h2,
.band-dark .detail-text h3,
.band-dark .detail-text p,
.band-dark .detail-text ul{grid-column:auto;}
.band-dark .detail-text h2{margin-top:0;}
.band-dark .detail-text li::marker{color:#a87c48;}

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

.dropcap::first-letter{
  float:left;
  font-family:var(--serif);
  font-size:64px;
  line-height:.86;
  padding:6px 12px 0 0;
  color:var(--accent);
}

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

.site-footer{
  border-top:1px solid rgba(34,32,28,.16);
  padding:54px 0 60px;
  text-align:center;
}
.site-footer .inner{
  grid-column:2 / 12;
  display:flex;flex-direction:column;align-items:center;gap:14px;
}
.site-footer .fname{font-family:var(--serif);font-size:21px;}
.site-footer nav ul{
  list-style:none;margin:0;padding:0;
  display:flex;flex-wrap:wrap;justify-content:center;
  gap:6px 0;
}
.site-footer nav li + li{border-left:1px solid rgba(34,32,28,.28);}
.site-footer nav a{
  display:block;padding:0 14px;font-size:15px;
  color:var(--ink-soft);text-decoration:none;
}
.site-footer nav a:hover{color:var(--accent);text-decoration:underline;}
.site-footer .fnote{font-size:13px;color:var(--ink-soft);max-width:56ch;margin:0;}

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

@media (max-width:980px){
  .col-main,.col-wide,.col-full,
  h1,.rule2,.lede,h2,h3,.intro,.kicker,
  .band p,.band ul,.band ol,.dl,.sep{grid-column:2 / 13;}
  .figure-main{grid-column:2 / 13;}
  .band-dark .figure-detail{grid-column:2 / 13;max-width:420px;}
  .band-dark .detail-text{grid-column:2 / 13;}
  .masthead .brand{grid-column:1 / 13;}
  .masthead nav{grid-column:1 / 13;margin-top:12px;}
  .masthead ul{justify-content:flex-start;}
  .site-footer .inner{grid-column:1 / 13;}
}

@media (max-width:640px){
  :root{--rhythm:46px;}
  body{font-size:16px;}
  .shell{column-gap:0;padding:0 18px;}
  .spine{flex-direction:row;gap:7px;padding-top:0;padding-bottom:20px;grid-column:1 / 13;}
  .hero .spine{grid-row:auto;}
  .spine span{width:14px;}
  .spine span:nth-child(3n){width:8px;}
  .col-main,.col-wide,.col-full,
  h1,.rule2,.lede,h2,h3,.intro,.kicker,
  .band p,.band ul,.band ol,.dl,.sep,
  .figure-main,.masthead .brand,.masthead nav,
  .band-dark .figure-detail,.band-dark .detail-text,
  .site-footer .inner{grid-column:1 / 13;}
  .hero{padding-top:40px;}
  .lede{font-size:18px;}
  .intro{font-size:17px;}
  .figure-main{margin-top:30px;}
  .band-dark .figure-detail{max-width:none;margin-bottom:28px;}
  .dropcap::first-letter{font-size:50px;}
  .sep{margin:32px 0;}
}