/* ============================================================
   Shared case-study stylesheet · Aldrich Han portfolio
   Same design language as index.html — warm off-white,
   near-black text, burnt sienna accent, editorial rhythm.
   ============================================================ */
:root{
  --bg:#F5F2EC; --bg-2:#EEEAE1; --card:#FFFFFF;
  --text:#0E0E0E; --text-2:#5A5A5A; --text-3:#9A9791;
  --line:rgba(0,0,0,0.08); --line-hi:rgba(0,0,0,0.16);
  --accent:#8A3B1E; --accent-soft:#F0E5DA;
  --good:#2FA85F; --warn:#B5842A; --bad:#C25454;
  --radius:14px;
  --pad:clamp(20px, 4vw, 40px);
  --stack:-apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",Inter,ui-sans-serif,system-ui,sans-serif;
  --serif:ui-serif,"Iowan Old Style","Apple Garamond",Georgia,"Times New Roman",serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--text);
  font-family:var(--stack);font-size:17px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  letter-spacing:-0.005em;
}
a{color:var(--text);text-decoration:none;border-bottom:1px solid var(--line-hi);transition:border-color .18s ease, color .18s ease}
a:hover{border-color:var(--text);color:var(--accent)}
a.plain{border:none}
a.plain:hover{color:var(--accent)}
.wrap{max-width:820px;margin:0 auto;padding:0 var(--pad)}
.wrap-wide{max-width:1080px;margin:0 auto;padding:0 var(--pad)}

/* NAV */
nav.top{
  position:sticky;top:0;z-index:10;
  background:color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter:saturate(1.2) blur(10px);
  -webkit-backdrop-filter:saturate(1.2) blur(10px);
  border-bottom:1px solid var(--line);
}
nav.top .row{display:flex;align-items:center;justify-content:space-between;height:64px;max-width:1080px;margin:0 auto;padding:0 var(--pad)}
nav.top .brand{font-weight:600;font-size:15px;letter-spacing:-0.01em}
nav.top ul{display:flex;gap:24px;margin:0;padding:0;list-style:none}
nav.top ul a{border:none;color:var(--text-2);font-size:14px}
nav.top ul a:hover{color:var(--text)}

/* BACK */
.back{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--text-3);font-size:13px;border:none;
  margin-top:28px;
}
.back:hover{color:var(--accent)}

/* HERO */
section.hero{padding:40px 0 56px}
.eyebrow{
  font-size:12px;text-transform:uppercase;letter-spacing:0.14em;color:var(--text-3);
  display:flex;align-items:center;gap:12px;margin-bottom:20px;
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--text-3)}
h1.title{
  font-size:clamp(38px, 6vw, 64px);line-height:1.02;letter-spacing:-0.035em;
  font-weight:520;margin:0 0 22px;
}
.subtitle{font-size:19px;color:var(--text-2);max-width:640px;margin:0}
.meta-row{
  display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:26px;
  font-size:12.5px;color:var(--text-3);letter-spacing:0.05em;text-transform:uppercase;
}
.meta-row span{display:inline-flex;align-items:center;gap:8px}
.meta-row span + span::before{content:"·";color:var(--text-3);margin-right:16px}

/* KEY METRICS STRIP */
.metrics{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:2px;background:var(--line);border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;margin:8px 0 8px;
}
.metrics .m{background:var(--card);padding:18px 20px}
.metrics .m .n{
  font-size:26px;letter-spacing:-0.02em;font-weight:520;line-height:1.1;
  color:var(--text);font-variant-numeric:tabular-nums;
}
.metrics .m .lbl{
  font-size:11.5px;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--text-3);margin-top:6px;
}

/* SECTIONS */
section.section{padding:56px 0;border-top:1px solid var(--line)}
section.section .eyebrow{margin-bottom:16px}
section.section h2{
  font-size:clamp(28px,3.6vw,36px);letter-spacing:-0.02em;font-weight:520;
  line-height:1.15;margin:0 0 22px;
}
section.section p{margin:0 0 18px;color:var(--text);max-width:720px}
section.section p.muted{color:var(--text-2)}
section.section ul{padding-left:22px;color:var(--text-2)}
section.section ul li{margin:8px 0}
section.section strong{color:var(--text)}
section.section em{color:var(--accent);font-style:normal;border-bottom:1px solid var(--accent);padding-bottom:1px}

/* VISUAL PANELS (inline anonymized diagrams) */
.viz-panel{
  background:linear-gradient(180deg, #FBFAF6 0%, #F4F0E7 100%);
  border:1px solid var(--line);border-radius:12px;padding:24px 26px;
  margin:24px 0;position:relative;color:var(--text-3);
}
.viz-panel .tag{
  position:absolute;top:10px;right:14px;
  font-size:9.5px;letter-spacing:0.14em;text-transform:uppercase;color:var(--text-3);
}
.viz-panel svg{width:100%;height:auto;display:block}
.viz-panel svg text{font-family:var(--stack);fill:currentColor}
.viz-panel svg .acc{stroke:var(--accent)}
.viz-panel svg .acc-f{fill:var(--accent)}
.viz-panel svg .grid-l{stroke:rgba(0,0,0,0.06);stroke-dasharray:2 3}
.viz-panel .caption{
  margin-top:14px;font-size:12.5px;color:var(--text-3);text-align:center;
  font-style:italic;
}

/* STACK CHIPS */
.stack{
  display:flex;flex-wrap:wrap;gap:6px;margin-top:12px;
}
.stack .chip{
  font-size:12.5px;color:var(--text-2);padding:5px 12px;border-radius:999px;
  background:var(--card);border:1px solid var(--line);letter-spacing:0.005em;
}

/* PULL QUOTE */
.pull{
  border-left:3px solid var(--accent);padding:6px 22px;margin:32px 0;
  font-size:20px;line-height:1.45;color:var(--text);letter-spacing:-0.01em;
  font-family:var(--serif);font-style:italic;
}

/* NEXT / CTA */
section.next{padding:80px 0 60px;border-top:1px solid var(--line)}
section.next .btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
section.next h2{
  font-size:clamp(28px,4.5vw,44px);letter-spacing:-0.03em;font-weight:520;
  line-height:1.1;margin:0 0 12px;
}
section.next p{font-size:16px;color:var(--text-2);max-width:640px;margin:0}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 18px;border-radius:999px;font-size:14px;font-weight:500;
  border:1px solid var(--text);background:var(--text);color:var(--bg);
  transition:transform .18s ease, background .18s ease;
}
.btn:hover{background:var(--accent);border-color:var(--accent);color:#fff;transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--text);border-color:var(--line-hi)}
.btn.ghost:hover{border-color:var(--text);background:transparent;color:var(--accent)}

/* FOOTER */
footer{
  border-top:1px solid var(--line);padding:28px 0 36px;
}
footer .row{
  display:flex;justify-content:space-between;align-items:center;
  font-size:12.5px;color:var(--text-3);letter-spacing:0.02em;
  max-width:1080px;margin:0 auto;padding:0 var(--pad);
}
footer .made{font-family:var(--serif);font-style:italic}
@media (max-width:640px){ footer .row{flex-direction:column;gap:8px;text-align:center} }