/* Case studies: the portfolio's paper, ink and terracotta, set for a long read.
   Shared by every page under /case-studies/. */
:root{
  --paper:#f6efe4;
  --paper-2:#efe5d6;
  --card:#fbf7f0;
  --ink:#241d18;
  --body:#3b322b;
  --muted:#6d6058;
  --rule:#ddcfbc;
  --terracotta:#b4562c;
  --amber:#a8762c;
  --ok:#3f6b45;
  --sans:"Helvetica Neue",Helvetica,-apple-system,"Segoe UI",sans-serif;
  --serif:"Instrument Serif",Georgia,serif;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  --gutter:48px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:17px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-wrap:pretty;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--terracotta);text-decoration:none;border-bottom:1px solid rgba(180,86,44,.35)}
a:hover{color:var(--ink);border-bottom-color:var(--ink)}
a:focus-visible,summary:focus-visible{outline:2px solid var(--terracotta);outline-offset:3px;border-radius:2px}
.mono{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:12px;top:-60px;background:var(--ink);color:var(--paper);padding:8px 14px;z-index:20;border:0}
.skip:focus{top:12px}

/* ---------- top bar ---------- */
.top{
  position:sticky;top:0;z-index:10;background:rgba(246,239,228,.94);
  backdrop-filter:saturate(1.2) blur(8px);-webkit-backdrop-filter:saturate(1.2) blur(8px);
  border-bottom:1px solid var(--rule);
}
.top-in{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:16px var(--gutter)}
.top nav{display:flex;gap:26px}
.top a.mono{color:var(--ink);border:0}
.top a.mono:hover{color:var(--terracotta)}
.top .back{display:inline-flex;align-items:center;gap:10px}
.progress{position:absolute;left:0;bottom:-1px;height:2px;width:100%;background:var(--terracotta);transform-origin:0 50%;transform:scaleX(0)}

/* ---------- hero ---------- */
.hero{padding:88px var(--gutter) 64px}
.hero .eyebrow{display:flex;flex-wrap:wrap;gap:10px 22px;margin-bottom:28px}
.hero h1{
  font-family:var(--serif);font-weight:400;margin:0;
  font-size:clamp(60px,10.5vw,168px);line-height:.88;letter-spacing:-.025em;
}
.hero h1 em{font-style:italic;color:var(--terracotta)}
.hero .dek{
  font-family:var(--serif);font-size:clamp(23px,2.5vw,36px);line-height:1.25;color:var(--body);
  max-width:34ch;margin:30px 0 0;
}
.meta{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px 32px;
  margin-top:56px;padding-top:22px;border-top:1px solid var(--rule);
}
.meta dt{margin-bottom:6px}
.meta dd{margin:0;font-size:15px;line-height:1.5;color:var(--body)}
.hero-shot{margin:56px 0 0}

/* ---------- metrics ---------- */
.metrics{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);
  margin:0 var(--gutter);
}
.metric{padding:26px 22px 24px 0}
.metric + .metric{padding-left:22px;border-left:1px solid var(--rule)}
.metric b{display:block;font-family:var(--serif);font-weight:400;font-size:clamp(40px,4.4vw,62px);line-height:1;letter-spacing:-.02em}
.metric span{display:block;margin-top:10px;font-size:14px;line-height:1.45;color:var(--muted)}

/* ---------- body: contents + article ---------- */
.cs{display:grid;grid-template-columns:200px minmax(0,1fr);gap:64px;padding:0 var(--gutter)}
.toc{position:sticky;top:96px;align-self:start;padding-top:96px;max-height:calc(100vh - 96px);overflow:auto}
.toc summary{display:none;cursor:pointer;list-style:none}
.toc summary::-webkit-details-marker{display:none}
.toc ol{list-style:none;margin:16px 0 0;padding:0;counter-reset:toc}
.toc li{counter-increment:toc;border-top:1px solid var(--rule)}
.toc li:last-child{border-bottom:1px solid var(--rule)}
.toc a{display:flex;gap:12px;padding:9px 0;border:0;color:var(--muted);font-size:14px;line-height:1.35}
.toc a::before{content:counter(toc,decimal-leading-zero);font-family:var(--mono);font-size:11px;letter-spacing:.08em;padding-top:2px;color:#b3a28b}
.toc a:hover,.toc a[aria-current="true"]{color:var(--ink)}
.toc a[aria-current="true"]::before{color:var(--terracotta)}

article{min-width:0;padding-bottom:40px}
article > section{padding-top:96px}
.sec-head{margin-bottom:36px}
.sec-head .mono{display:block;margin-bottom:14px;color:var(--terracotta)}
.sec-head h2{font-family:var(--serif);font-weight:400;font-size:clamp(36px,4.4vw,62px);line-height:1;letter-spacing:-.015em;margin:0;max-width:20ch}
article h3{font-family:var(--serif);font-weight:400;font-size:clamp(26px,2.6vw,34px);line-height:1.1;letter-spacing:-.01em;margin:64px 0 18px}
article h4{font-family:var(--mono);font-weight:500;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink);margin:36px 0 12px}
article p,article ul,article ol{max-width:68ch;color:var(--body)}
article p{margin:0 0 18px}
article strong{color:var(--ink);font-weight:600}
.lead{font-family:var(--serif);font-size:clamp(22px,2.1vw,29px);line-height:1.4;color:#33291f}
.lead strong{font-weight:400;color:var(--terracotta)}
article ul.ticks{list-style:none;padding:0;margin:0 0 22px}
article ul.ticks li{position:relative;padding-left:22px;margin:0 0 10px}
article ul.ticks li::before{content:"";position:absolute;left:2px;top:.72em;width:8px;height:1px;background:var(--terracotta)}

/* brief / quote */
blockquote.brief{
  margin:32px 0;padding:4px 0 4px 26px;border-left:2px solid var(--terracotta);max-width:60ch;
}
blockquote.brief p{font-family:var(--serif);font-style:italic;font-size:clamp(22px,2.2vw,30px);line-height:1.3;color:var(--ink);margin:0 0 10px}
blockquote.brief cite{font-style:normal}

/* note */
.note{background:var(--paper-2);border:1px solid var(--rule);border-radius:6px;padding:20px 24px;margin:28px 0;max-width:72ch}
.note p:last-child{margin-bottom:0}
.note .mono{display:block;margin-bottom:8px;color:var(--terracotta)}

/* principle cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin:28px 0}
.card{background:var(--card);border:1px solid var(--rule);border-radius:6px;padding:22px 22px 20px}
.card .mono{display:block;margin-bottom:12px}
.card h5{font-family:var(--serif);font-weight:400;font-size:24px;line-height:1.15;margin:0 0 10px}
.card p{font-size:15px;line-height:1.55;margin:0;color:var(--body)}

/* tables */
.tbl{position:relative;overflow-x:auto;margin:24px 0 32px;-webkit-overflow-scrolling:touch;border-top:1px solid var(--ink)}
.tbl:focus-visible{outline:2px solid var(--terracotta);outline-offset:3px}
table{width:100%;border-collapse:collapse;font-size:15px;line-height:1.5;min-width:600px}
caption{caption-side:bottom;text-align:left;padding-top:10px;font-size:13px;color:var(--muted)}
th{font-family:var(--mono);font-weight:500;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);text-align:left;padding:12px 16px 10px 0;vertical-align:bottom}
td{padding:14px 16px 14px 0;border-top:1px solid var(--rule);vertical-align:top;color:var(--body)}
tbody tr:last-child td{border-bottom:1px solid var(--rule)}
td:first-child{color:var(--ink);font-weight:500}
td.q{font-family:var(--serif);font-size:18px;line-height:1.3;color:var(--ink)}
table.matrix{min-width:560px}
table.matrix th:not(:first-child),table.matrix td:not(:first-child){text-align:center;width:13%}
table.matrix td.y{color:var(--ok);font-weight:600}
table.matrix td.n{color:var(--rule)}
table.matrix td:first-child{font-weight:400}
tr.hl td{background:rgba(180,86,44,.06)}

/* before / after */
.ba{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px;margin:28px 0}
.ba > div{border:1px solid var(--rule);border-radius:6px;padding:20px 22px;background:var(--card)}
.ba > div:last-child{border-color:rgba(180,86,44,.55)}
.ba .mono{display:block;margin-bottom:10px}
.ba > div:last-child .mono{color:var(--terracotta)}
.ba p{font-size:15px;line-height:1.55;margin:0 0 8px}
.ba p:last-child{margin:0}
.ba figure{margin:0 0 14px}

/* timeline */
ol.tl{list-style:none;padding:0;margin:28px 0;max-width:none}
ol.tl li{display:grid;grid-template-columns:120px minmax(0,1fr);gap:24px;padding:16px 0;border-top:1px solid var(--rule)}
ol.tl li:last-child{border-bottom:1px solid var(--rule)}
ol.tl .mono{padding-top:4px;color:var(--terracotta)}
ol.tl p{margin:0;max-width:64ch}
ol.tl b{color:var(--ink);font-weight:600}

/* figures */
figure.shot{margin:40px 0}
figure.shot a{display:block;border:0}
figure.shot img{border:1px solid var(--rule);border-radius:8px;background:var(--card);box-shadow:0 1px 0 rgba(36,29,24,.04),0 18px 40px -24px rgba(60,38,20,.35)}
figure.shot figcaption{display:flex;gap:14px;margin-top:14px;font-size:14px;line-height:1.5;color:var(--muted);max-width:76ch}
figure.shot figcaption .mono{flex:none;padding-top:2px;color:var(--terracotta)}
.duo{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;align-items:start}
.duo figure.shot{margin:0}
.with-phone{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:24px;align-items:start;margin:40px 0}
.with-phone figure.shot{margin:0}
figure.phone img{border-radius:22px}
.figs{margin:40px 0}

/* closing */
.next{
  margin:120px var(--gutter) 0;padding:56px 0 64px;border-top:1px solid var(--ink);
  display:flex;justify-content:space-between;align-items:flex-end;gap:32px;flex-wrap:wrap;
}
.next a.big{font-family:var(--serif);font-size:clamp(36px,5.4vw,80px);line-height:1;letter-spacing:-.02em;border-bottom-width:2px}
footer{padding:28px var(--gutter) 40px;display:flex;justify-content:space-between;gap:24px;border-top:1px solid var(--rule)}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .meta{grid-template-columns:repeat(2,minmax(0,1fr))}
  .cs{grid-template-columns:170px minmax(0,1fr);gap:40px}
}
@media (max-width:900px){
  :root{--gutter:16px}
  body{font-size:16px}
  .hero{padding:56px var(--gutter) 40px}
  .meta{grid-template-columns:minmax(0,1fr);gap:18px}
  .metrics{grid-template-columns:repeat(2,minmax(0,1fr))}
  .metric,.metric + .metric{padding:20px 12px 18px 0;border-left:0}
  .metric:nth-child(even){padding-left:14px;border-left:1px solid var(--rule)}
  .metric:nth-child(n+3){border-top:1px solid var(--rule)}
  .cs{display:block}
  .toc{position:static;max-height:none;padding-top:36px}
  .toc summary{display:block}
  article > section{padding-top:72px}
  .ba,.duo,.with-phone{grid-template-columns:minmax(0,1fr)}
  .with-phone figure.phone{max-width:260px}
  ol.tl li{grid-template-columns:minmax(0,1fr);gap:4px}
  .top-in{padding:12px var(--gutter)}
  .top nav{gap:18px}
  .next{margin-top:80px}
  footer{flex-direction:column}
}