@import url('modernist.css');

.site-shell { max-width: 720px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }
.site-header-bar { border-bottom: 2px solid var(--color-divider); }
.site-header-bar .site-shell { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding-top: 28px; padding-bottom: 28px; }
.site-footer-bar { border-top: 1px solid var(--color-divider); }
.site-footer-bar .site-shell { padding-top: 28px; padding-bottom: 56px; font-size: 13px; color: color-mix(in srgb, var(--color-text) 55%, transparent); }
.site-footer-bar a { color: color-mix(in srgb, var(--color-text) 55%, transparent); text-decoration: underline; text-underline-offset: 2px; }
.site-footer-bar a:hover { color: var(--color-accent-700); }

.nav-brand { color: var(--color-text); text-decoration: none; display: inline-flex; align-items: center; gap: 10px; }
.brand-mark { width: 22px; height: 22px; flex-shrink: 0; }
.nav-links { display: flex; gap: 28px; font-size: 14px; }
.nav-links a { text-decoration: none; color: var(--color-text); display: inline-flex; align-items: center; padding: 6px 0; }
.nav-links a:hover, .nav-links a[aria-current='page'] { color: var(--color-accent-700); }
.ext-icon { font-size: 11px; margin-left: 2px; opacity: 0.6; }

.post-content a, .page-content a, .intro a { color: var(--color-accent-700); }
.post-content a:hover, .page-content a:hover, .intro a:hover { text-decoration-thickness: 2px; }

main.site-shell { padding-top: 64px; padding-bottom: 96px; min-height: 40vh; }
.intro { color: color-mix(in srgb, var(--color-text) 60%, transparent); margin: 0 0 40px; font-size: 16px; line-height: 1.6; }

.post-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--color-divider); }
.post-list li { padding: 24px 0; border-bottom: 1px solid var(--color-divider); }
.post-list-main { display: flex; gap: 28px; align-items: baseline; }
.post-date, .post-reading-time { font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: color-mix(in srgb, var(--color-text) 55%, transparent); flex-shrink: 0; }
.post-date { min-width: 90px; }
.post-link { font-size: 17px; font-weight: 600; text-decoration: none; color: var(--color-text); }
.post-link:hover { color: var(--color-accent-700); }
.post-list-tags { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 0; padding: 0 0 0 118px; }

/* — smooth, fast, deliberately subtle — */
.nav-links a, .post-link, .site-footer-bar a, .post-content a, .page-content a, .intro a, .post-toc a {
  transition: color 0.15s ease;
}
@media (prefers-reduced-motion: reduce) {
  .nav-links a, .post-link, .site-footer-bar a, .post-content a, .page-content a, .intro a, .post-toc a {
    transition: none;
  }
}

.post-title, .page-title { font-size: 32px; margin: 0 0 16px; }
.post-meta { font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: color-mix(in srgb, var(--color-text) 55%, transparent); margin: 0 0 40px; }
.post-content, .page-content { font-size: 17px; line-height: 1.65; }
.post-content p, .page-content p { margin: 0 0 24px; }

/* ══════════════════════════════════════════════════════════════════════════
   Case-study article components. Additive: every class is namespaced and
   unused by existing posts, so nothing already published changes. Built from
   the modernist.css tokens only — no new colours, no new fonts, no radii.
   ══════════════════════════════════════════════════════════════════════ */

/* — subtitle under the post title — */
.post-standfirst {
  font-size: 19px; line-height: 1.5; margin: -8px 0 32px;
  color: color-mix(in srgb, var(--color-text) 65%, transparent);
}

/* — tag row — */
.post-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 40px; }

/* — table of contents — */
.post-toc {
  border-top: 2px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  padding: 20px 0; margin: 0 0 48px;
}
.post-toc h2 {
  font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: color-mix(in srgb, var(--color-text) 55%, transparent);
  margin: 0 0 14px;
}
.post-toc ol {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 28px; counter-reset: toc;
}
.post-toc li { counter-increment: toc; font-size: 14px; line-height: 1.4; }
.post-toc li::before {
  content: counter(toc, decimal-leading-zero);
  margin-right: 10px; font-size: 11px;
  color: color-mix(in srgb, var(--color-text) 45%, transparent);
}
.post-toc a { color: var(--color-text); text-decoration: none; }
.post-toc a:hover { color: var(--color-accent-700); text-decoration: underline; }

/* — callout / pull quote — */
.callout {
  border-left: 3px solid var(--color-accent);
  background: var(--color-accent-100);
  padding: 20px 24px; margin: 0 0 24px;
}
.callout p { margin: 0; font-size: 17px; line-height: 1.5; }
.callout p + p { margin-top: 12px; }

/* — provenance legend + inline status chips — */
.legend { display: grid; gap: 10px; margin: 0 0 24px; }
.legend-row { display: flex; gap: 12px; align-items: baseline; font-size: 15px; }
.chip {
  flex: none; min-width: 92px; font-size: 10px; letter-spacing: 0.08em;
  text-transform: uppercase; padding: 3px 8px; text-align: center;
}
.chip-verified { background: var(--color-neutral-200); color: var(--color-neutral-900); }
.chip-synthetic { background: var(--color-accent-2-100); color: var(--color-accent-2-800); }
.chip-assumed  { background: var(--color-accent-100); color: var(--color-accent-800); }
.chip-gap      { border: 1px solid var(--color-accent); color: var(--color-accent-700); }

/* — architecture flow diagram (semantic <ol>, drawn with CSS) — */
.arch { margin: 0 0 32px; }
.arch ol { list-style: none; padding: 0; margin: 0; counter-reset: arch; }
.arch li {
  position: relative; counter-increment: arch;
  padding: 16px 0 16px 56px;
  border-top: 1px solid var(--color-divider);
}
.arch li:last-child { border-bottom: 1px solid var(--color-divider); }
.arch li::before {
  content: counter(arch);
  position: absolute; left: 0; top: 16px;
  width: 32px; height: 32px; display: grid; place-items: center;
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 13px;
  background: var(--color-surface); color: var(--color-text);
  border: 1px solid var(--color-divider);
}
/* connector between steps */
.arch li:not(:last-child)::after {
  content: ""; position: absolute; left: 15.5px; top: 48px; bottom: -1px;
  width: 1px; background: var(--color-divider);
}
.arch .arch-t {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 16px; line-height: 1.25; margin: 0 0 4px;
}
.arch .arch-d {
  font-size: 14px; line-height: 1.5; margin: 0;
  color: color-mix(in srgb, var(--color-text) 70%, transparent);
}

/* — limitations block: visually distinct, deliberately plain — */
.limits {
  border: 2px solid var(--color-divider);
  padding: 24px; margin: 0 0 24px;
}
.limits h3 { font-size: 17px; margin: 0 0 4px; }
.limits > p { font-size: 14px; margin: 0 0 20px; color: color-mix(in srgb, var(--color-text) 65%, transparent); }
.limits dl { margin: 0; display: grid; gap: 16px; }
.limits dt {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 14px; margin-bottom: 3px;
}
.limits dd { margin: 0; font-size: 14px; line-height: 1.55; color: color-mix(in srgb, var(--color-text) 75%, transparent); }

/* — checklist — */
.checklist { list-style: none; padding: 0; margin: 0 0 24px; }
.checklist li {
  position: relative; padding: 10px 0 10px 30px;
  border-bottom: 1px solid var(--color-divider); font-size: 15px; line-height: 1.5;
}
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 15px;
  width: 13px; height: 13px; border: 1.5px solid var(--color-accent);
}

/* — results table gets a horizontal scroll rail on small screens — */
.table-scroll { overflow-x: auto; margin: 0 0 24px; -webkit-overflow-scrolling: touch; }
.table-scroll .table { min-width: 460px; }
.table td.num, .table th.num { text-align: right; font-variant-numeric: tabular-nums; }

/* — mobile — */
@media (max-width: 640px) {
  .post-standfirst { font-size: 17px; }
  .post-toc ol { grid-template-columns: 1fr; }
  .callout { padding: 16px 18px; }
  .callout p { font-size: 16px; }
  .limits { padding: 18px; }
  .arch li { padding-left: 46px; }
  .arch li::before { width: 26px; height: 26px; font-size: 12px; }
  .arch li:not(:last-child)::after { left: 12.5px; top: 42px; }
  .legend-row { flex-direction: column; gap: 4px; }
  .chip { align-self: flex-start; }
  .post-list-tags { padding-left: 0; }
}