/* ============================================================
   Case-study + notes sub-page styles.
   Reuses variables/classes from styles.css (linked first).
   Light "quiet luxury" sage theme, Fraunces display.
   ============================================================ */

/* Sub-page nav: simple, solid paper, back to home */
.subnav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 16px clamp(20px, 5vw, 56px);
  background: rgba(251, 250, 247, 0.92);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.subnav__brand {
  font-family: var(--font-display); font-weight: 700; font-size: 1.2rem;
  letter-spacing: -0.01em; display: inline-flex; align-items: center; gap: 8px;
}
.subnav__brand .nav__dot { color: var(--accent); }
.subnav__links { display: flex; gap: 22px; align-items: center; }
.subnav__links a {
  font-family: var(--font-mono); font-size: 0.85rem; color: var(--muted);
  transition: color 0.25s var(--ease);
}
.subnav__links a:hover { color: var(--accent); }

/* Article shell */
.doc { max-width: 760px; margin: 0 auto; padding: clamp(28px, 6vw, 64px) clamp(20px, 5vw, 56px) 40px; }
.doc__eyebrow {
  font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.06em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 14px;
}
.doc__title {
  font-family: var(--font-display); font-weight: 700; letter-spacing: -0.02em;
  line-height: 1.08; font-size: clamp(2rem, 5.5vw, 3.1rem); margin-bottom: 16px;
}
.doc__lead { color: var(--muted); font-size: clamp(1.05rem, 2.4vw, 1.22rem); margin-bottom: 10px; }
.doc__meta {
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--muted);
  margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px 18px;
}

.doc h2 {
  font-family: var(--font-display); font-weight: 700; letter-spacing: -0.01em;
  font-size: clamp(1.35rem, 3.4vw, 1.8rem); margin: 46px 0 14px;
}
.doc h2 .doc__num { color: var(--accent); font-family: var(--font-mono); font-size: 0.72em; margin-right: 10px; }
.doc h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.18rem; margin: 26px 0 10px; }
.doc p { color: var(--text); font-size: 1.05rem; margin-bottom: 16px; }
.doc p.muted { color: var(--muted); }
.doc ul, .doc ol { margin: 0 0 18px 1.2em; color: var(--text); }
.doc li { margin-bottom: 8px; font-size: 1.03rem; }
.doc strong { font-weight: 600; }
.doc code {
  font-family: var(--font-mono); font-size: 0.86em; background: var(--bg-soft);
  border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px;
}
.doc a.inline { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }

/* Callout: the one hard decision / trade-off */
.callout {
  background: linear-gradient(135deg, var(--surface), var(--bg-soft));
  border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: var(--radius); padding: 22px 24px; margin: 22px 0 26px;
}
.callout__label {
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 8px;
}
.callout p:last-child { margin-bottom: 0; }

/* Outcome number grid */
.metrics {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px; margin: 8px 0 24px;
}
.metric {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 18px; text-align: center;
}
.metric b {
  display: block; font-family: var(--font-display); font-weight: 700;
  font-size: 1.9rem; color: var(--accent); line-height: 1; letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.metric span {
  display: block; margin-top: 8px; color: var(--muted);
  font-size: 0.82rem; font-family: var(--font-mono);
}

/* Simple CSS "architecture" diagram (no images) */
.arch {
  display: flex; flex-wrap: wrap; align-items: stretch; gap: 10px;
  margin: 10px 0 24px;
}
.arch__node {
  flex: 1 1 150px; background: var(--surface); border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 6px); padding: 14px 16px;
}
.arch__node--accent { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fbf8f1; border-color: transparent; }
.arch__node h4 { font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.03em; margin-bottom: 6px; }
.arch__node p { font-size: 0.86rem; margin: 0; color: inherit; opacity: 0.9; }
.arch__node--accent p { color: #eef4ea; }
.arch__flow {
  display: flex; align-items: center; justify-content: center;
  color: var(--accent); font-weight: 700; font-size: 1.2rem; padding: 0 2px;
}
@media (max-width: 640px) {
  .arch { flex-direction: column; }
  .arch__flow { transform: rotate(90deg); padding: 2px 0; }
}

/* Tech chips (reuse .chips/.chip from styles.css) */
.doc .chips { margin: 4px 0 8px; }

/* FAQ (works with JS disabled via <details>) */
.faq { margin: 14px 0 8px; }
.faq details {
  border: 1px solid var(--border); border-radius: calc(var(--radius) - 6px);
  background: var(--surface); padding: 4px 20px; margin-bottom: 12px;
}
.faq summary {
  font-family: var(--font-display); font-weight: 600; font-size: 1.06rem;
  cursor: pointer; padding: 14px 0; list-style: none; position: relative;
  padding-right: 28px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 0; top: 12px; color: var(--accent);
  font-size: 1.3rem; font-family: var(--font-mono); transition: transform 0.25s var(--ease);
}
.faq details[open] summary::after { content: "\2212"; }
.faq details p { color: var(--muted); font-size: 1rem; padding-bottom: 14px; margin: 0; }

/* CTA band */
.cta-band {
  background: linear-gradient(135deg, var(--surface), var(--bg-soft));
  border: 1px solid var(--border); border-radius: 24px;
  padding: clamp(30px, 5vw, 48px); text-align: center; margin: 40px 0 10px;
}
.cta-band h2 { margin: 0 0 12px; }
.cta-band p { color: var(--muted); margin-bottom: 24px; }

/* Post list (notes index) */
.postlist { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.postlist li {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px 26px; transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.postlist li:hover { border-color: rgba(110,142,99,0.55); transform: translateY(-2px); }
.postlist a { display: block; }
.postlist h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.3rem; margin-bottom: 8px; }
.postlist p { color: var(--muted); font-size: 0.98rem; margin: 0; }
.postlist .postlist__meta { font-family: var(--font-mono); font-size: 0.76rem; color: var(--muted); margin-bottom: 10px; }

.doc__footlinks { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); }
.doc__footlinks a { font-family: var(--font-mono); font-size: 0.85rem; color: var(--accent); }