:root {
  --bg:#0A1024; --text:#EEF2FF; --muted:#AEB9D8; --line:rgba(255,255,255,.15);
  --purple:#A78BFA; --blue:#60A5FA; --teal:#5EEAD4; --amber:#F4B56A;
  --paper:#FBFBFF; --paper-text:#182033; --shadow:0 24px 80px rgba(0,0,0,.30); --radius:26px;
  --font-heading:"Bricolage Grotesque",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"Hanken Grotesk",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);color:var(--text);line-height:1.66}
body.request-theme{
  background:
    radial-gradient(circle at 9% 4%,rgba(167,139,250,.18),transparent 34rem),
    radial-gradient(circle at 84% 13%,rgba(94,234,212,.13),transparent 30rem),
    radial-gradient(circle at 52% 78%,rgba(244,181,106,.07),transparent 34rem),
    linear-gradient(135deg,#070D1E 0%,#111A35 48%,#070B18 100%);
}
a{color:inherit}
.progress{position:fixed;top:0;left:0;height:4px;width:0;background:linear-gradient(90deg,var(--purple),var(--blue),var(--teal),var(--amber));z-index:100}
.shell{max-width:1240px;margin:0 auto;padding:28px}

.hero,.reader-layout{display:grid}
.hero{grid-template-columns:minmax(0,1.16fr) minmax(300px,.84fr);gap:28px;align-items:stretch;padding:28px 0}
.hero-main,.hero-side,.article-card,.toc-card,.debt-loop-panel{
  border:1px solid var(--line);
  background:linear-gradient(180deg,rgba(255,255,255,.115),rgba(255,255,255,.055));
  backdrop-filter:blur(20px);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.hero-main{padding:clamp(30px,5vw,62px);display:flex;flex-direction:column;justify-content:space-between;overflow:hidden}
.eyebrow{display:inline-flex;width:fit-content;padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.10);color:var(--muted);font-weight:800;font-size:12px;letter-spacing:.13em;text-transform:uppercase}
h1.hero-title{font-family:var(--font-heading);font-size:clamp(44px,6.2vw,76px);line-height:.96;margin:28px 0 18px;letter-spacing:-.055em}
.hero-subtitle{color:var(--muted);font-size:clamp(18px,2vw,23px);max-width:820px;margin:0 0 34px}
.hero-quote{font-family:var(--font-heading);font-size:clamp(24px,3vw,38px);line-height:1.1;font-weight:750;letter-spacing:-.032em;max-width:900px;margin:30px 0}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}
.btn{display:inline-flex;align-items:center;gap:10px;text-decoration:none;padding:12px 16px;border-radius:999px;background:rgba(255,255,255,.11);border:1px solid var(--line);font-weight:750}
.btn.primary{background:linear-gradient(135deg,rgba(167,139,250,.30),rgba(96,165,250,.23))}
.hero-side{padding:26px;display:flex;flex-direction:column;justify-content:space-between}
.badge{color:var(--teal);font-size:13px;font-weight:850;text-transform:uppercase;letter-spacing:.12em}
.metric-grid{display:grid;gap:12px;margin:24px 0}
.metric{padding:18px;border:1px solid var(--line);border-radius:20px;background:rgba(255,255,255,.075)}
.metric strong{display:block;font-family:var(--font-heading);font-size:24px;line-height:1}
.metric span{display:block;color:var(--muted);font-size:13px;margin-top:8px}
.side-note{color:var(--muted);border-top:1px solid var(--line);padding-top:18px;font-size:15px}

.debt-loop-panel{margin:12px 0 30px;padding:clamp(24px,4vw,38px)}
.debt-loop-head{max-width:900px}
.debt-loop-head>span{color:var(--amber);font-size:11px;font-weight:900;letter-spacing:.13em;text-transform:uppercase}
.debt-loop-head h2{font-family:var(--font-heading);font-size:clamp(30px,4vw,46px);line-height:1.03;letter-spacing:-.04em;margin:8px 0 10px}
.debt-loop-head p{color:var(--muted);font-size:16px;margin:0}
.debt-loop{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr;gap:12px;align-items:stretch;margin-top:26px}
.debt-loop article{padding:18px;border-radius:18px;border:1px solid var(--line);background:rgba(255,255,255,.06)}
.debt-loop article span{display:block;color:var(--teal);font-size:11px;font-weight:900;letter-spacing:.10em}
.debt-loop article strong{display:block;font-family:var(--font-heading);font-size:18px;line-height:1.15;margin:7px 0}
.debt-loop article p{color:var(--muted);font-size:13px;line-height:1.45;margin:0}
.debt-loop>b{align-self:center;color:var(--purple);font-size:22px}
.loop-return{margin-top:14px;padding-top:14px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}
.loop-return span{color:var(--amber);font-size:20px;margin-right:8px}

.reader-layout{grid-template-columns:270px minmax(0,1fr);gap:24px;align-items:start;margin-top:28px}
.toc-wrap{position:sticky;top:82px;align-self:start;height:max-content}
.toc-card{padding:18px}
.toc-card h3{margin:0 0 12px;font-size:14px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted)}
.toc-card nav{display:grid;gap:4px}
.toc-card a{text-decoration:none;color:var(--muted);padding:9px 10px;border-radius:12px;font-size:14px;line-height:1.25}
.toc-card a:hover,.toc-card a.active,.toc-card a.is-current{color:#fff;background:rgba(255,255,255,.10)}

.article-card{background:var(--paper);color:var(--paper-text);padding:clamp(26px,5vw,64px);overflow:hidden}
.content-section{scroll-margin-top:92px;border-top:1px solid rgba(24,32,51,.11);padding-top:34px;margin-top:34px}
.content-section:first-child{border-top:0;margin-top:0;padding-top:0}
.article-card h1,.article-card h2,.article-card h3{font-family:var(--font-heading);color:#0A1024;line-height:1.12;letter-spacing:-.035em}
.article-card h1{font-size:clamp(34px,5vw,58px);margin:0 0 18px}
.article-card h2{font-size:clamp(28px,3.5vw,42px);margin:0 0 16px}
.article-card p{font-size:18px;margin:0 0 18px;color:var(--paper-text)}
.article-card a{color:#2849A7;font-weight:700}
.article-deck{font-size:20px!important;color:#38435D!important}
.section-divider{height:1px;background:linear-gradient(90deg,transparent,rgba(24,32,51,.18),transparent);margin:32px 0}
.article-card blockquote{margin:28px 0;padding:22px 26px;border-radius:18px;background:#F2F5FF;border-left:4px solid #6B7CFF}
.article-card blockquote p{margin:0!important;font-family:var(--font-heading);font-size:clamp(21px,2.6vw,29px)!important;line-height:1.22;color:#111A35!important}
.article-card .debt-loop-quote{background:linear-gradient(135deg,#0B1732,#17163C);border:1px solid rgba(167,139,250,.55);border-left:5px solid var(--purple)}
.article-card .debt-loop-quote p{color:#F4F7FF!important;font-size:clamp(20px,2.4vw,28px)!important;line-height:1.42}
.article-card .request-quote{background:#111A35;border-left-color:var(--amber)}
.article-card .request-quote p{color:#F4F7FF!important}
.article-card .question-quote{background:linear-gradient(135deg,#0B1732,#101F3A);border:1px solid rgba(96,165,250,.42);border-left:5px solid var(--blue)}
.article-card .question-quote p{color:#F4F7FF!important}
.diagnostic-list{padding-left:0;list-style:none;counter-reset:diagnostic;display:grid;gap:12px;margin:26px 0}
.diagnostic-list>li{counter-increment:diagnostic;position:relative;padding:18px 20px 18px 62px;border:1px solid rgba(24,32,51,.11);border-radius:16px;background:#F6F8FD;font-size:17px}
.diagnostic-list>li::before{content:counter(diagnostic);position:absolute;left:18px;top:17px;width:28px;height:28px;display:grid;place-items:center;border-radius:9px;background:#111A35;color:white;font-weight:900;font-size:13px}
.diagnostic-list>li strong{color:#111A35}
.closing-line{margin:34px 0 4px!important;padding:24px 28px;border-radius:20px;background:linear-gradient(135deg,#0B1732,#17163C);color:#F4F7FF!important;font-family:var(--font-heading);font-size:clamp(22px,2.7vw,31px)!important;line-height:1.25}

@media(max-width:980px){
  .hero,.reader-layout{grid-template-columns:1fr}
  .toc-wrap{position:relative;top:0}
  .debt-loop{grid-template-columns:1fr}
  .debt-loop>b{transform:rotate(90deg);justify-self:center}
}
@media(max-width:720px){
  .shell{padding:18px}
  .article-card p{font-size:17px}
  h1.hero-title{font-size:clamp(42px,12vw,64px)}
  .debt-loop-panel{padding:22px 18px}
}

/* Closing forward-exit panel, mirroring the Draw the Map handoff treatment. */
.request-next {
  margin-top: 30px;
  padding: clamp(38px,5vw,60px);
  border: 1px solid var(--line);
  border-radius: 30px;
  background:
    radial-gradient(circle at 80% 22%, rgba(96,165,250,.09), transparent 23rem),
    linear-gradient(135deg, rgba(255,255,255,.075), rgba(255,255,255,.03));
}
.request-next > span { color: var(--amber); text-transform:uppercase; letter-spacing:.14em; font-size:11px; font-weight:900; }
.request-next h2 { max-width:900px; margin:11px 0 24px; color:#f3f7ff; font-size:clamp(26px,3vw,40px); line-height:1.12; letter-spacing:-.035em; }
.request-next h2 a { color:inherit; text-decoration-color:rgba(94,234,212,.55); text-underline-offset:5px; }


/* Register shift: lived author passages, styled as a paired narrative seam rather than a callout. */
.author-passage {
  max-width: 92%;
  margin: 26px 0 30px 10px;
  padding: 4px 0 4px 24px;
  border-left: 3px solid rgba(244,181,106,.72);
  background: linear-gradient(90deg, rgba(244,181,106,.065), rgba(244,181,106,0) 72%);
}
.author-passage p { max-width: 760px; }
.author-passage p:last-child { margin-bottom: 0; }

/* Four in-place argument highlights. No duplicate copy. */
.article-card .article-highlight {
  margin: 28px 0;
  padding: 22px 26px;
  border-left: 5px solid var(--teal);
  background: linear-gradient(135deg,#0B1732,#17163C);
  color: #F4F7FF !important;
  font-family: var(--font-heading);
  font-size: clamp(21px,2.45vw,29px) !important;
  line-height: 1.28;
  letter-spacing: -.018em;
}
#conceptual-debt-and-technical-debt .article-highlight {
  padding: 28px 30px;
  border-left-color: var(--amber);
  font-size: clamp(24px,3vw,34px) !important;
  line-height: 1.2;
}
.article-card h3#object-reuse-and-accumulated-meaning {
  margin: 34px 0 14px;
  font-size: clamp(21px,2.4vw,28px);
  letter-spacing: -.025em;
}


/* Business-model diagrams: conceptual, not decorative. */
.concept-diagram {
  margin: 30px 0 36px;
}
.concept-diagram .diagram-frame {
  overflow: hidden;
  border-radius: 20px;
  border: 1px solid rgba(24,32,51,.12);
  background: #0A1024;
  box-shadow: 0 14px 38px rgba(10,16,36,.12);
}
.concept-diagram svg {
  display: block;
  width: 100%;
  height: auto;
}
.concept-diagram figcaption {
  margin: 10px 4px 0;
  color: #687189;
  font-size: 14px;
  line-height: 1.45;
}
@media(max-width:720px) {
  .concept-diagram { margin: 24px 0 30px; }
  .concept-diagram figcaption { font-size: 13px; }
}