/* ============================================================
   Blog — long-form reading layer on top of index.css tokens.
   Reuses :root variables, fonts, nav, footer from index.css.
   ============================================================ */

/* ---------- blog index ---------- */
.blog-head {
  padding-top: 5rem;
  padding-bottom: 1rem;
}
.blog-head h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-bottom: 0.9rem;
}
.blog-head p {
  max-width: 52ch;
  color: var(--ink-soft);
  font-size: 1.16rem;
}

.post-list { padding-top: 1rem; padding-bottom: 4rem; }
.post-link {
  display: block;
  padding: 2.6rem 0;
  border-top: 1px solid var(--rule);
  color: inherit;
}
.post-link:hover { color: inherit; }
.post-link:hover h2 { color: var(--signal); }
.post-link .post-kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--ink-soft);
  margin-bottom: 0.6rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.post-link h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  letter-spacing: -0.015em;
  line-height: 1.12;
  margin-bottom: 0.6rem;
  transition: color 0.18s ease;
}
.post-link .post-dek {
  color: var(--ink-soft);
  max-width: 60ch;
  font-size: 1.08rem;
}
.post-link .post-more {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--signal);
  margin-top: 0.9rem;
}

/* ---------- article ---------- */
.article { padding-bottom: 5rem; }

.article-header {
  padding-top: 4.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 3rem;
}
.article-meta {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-soft);
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
  margin-bottom: 1.4rem;
}
.article-meta .dot { color: var(--mask); }
.article h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.1rem, 5.4vw, 3.5rem);
  letter-spacing: -0.025em;
  line-height: 1.04;
  margin-bottom: 1.1rem;
  max-width: 18ch;
}
.article-dek {
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
  line-height: 1.45;
  color: var(--ink-soft);
  max-width: 46ch;
}
.article-byline {
  margin-top: 1.6rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink);
}
.article-byline a { color: var(--signal); }

/* reading column */
.prose { max-width: 42rem; }
.prose > * { margin-left: auto; margin-right: auto; }
.prose p,
.prose ul,
.prose ol,
.prose h2,
.prose h3,
.prose .callout,
.prose blockquote { max-width: 42rem; }

.prose p {
  font-size: 1.16rem;
  line-height: 1.66;
  color: #23232b;
  margin-bottom: 1.5rem;
}
.prose p .lead-cap::first-letter { font-size: 1.1em; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose a { text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }

.prose h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  letter-spacing: -0.015em;
  line-height: 1.12;
  margin-top: 4rem;
  margin-bottom: 1.2rem;
}
.prose h2 .h2-num {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--signal);
  display: block;
  margin-bottom: 0.5rem;
  letter-spacing: 0.04em;
  font-weight: 400;
}
.prose h3 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.25rem;
  margin-top: 2.2rem;
  margin-bottom: 0.8rem;
}
.prose ul, .prose ol { margin-bottom: 1.5rem; padding-left: 1.3rem; }
.prose li { font-size: 1.12rem; line-height: 1.6; margin-bottom: 0.5rem; color: #23232b; }

.prose code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.08em 0.35em;
}

/* analogy / note block */
blockquote {
  border-left: 3px solid var(--signal);
  padding: 0.3rem 0 0.3rem 1.4rem;
  margin: 2.2rem auto;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.2rem;
  line-height: 1.5;
  color: var(--ink);
}

/* big-number callout */
.callout {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  margin: 2.4rem auto;
  padding: 1.4rem 1.6rem;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--signal);
  border-radius: 4px;
  background: #fff;
}
.callout .big {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 2.9rem);
  letter-spacing: -0.02em;
  color: var(--signal);
  line-height: 1;
  flex-shrink: 0;
}
.callout .big-label {
  font-family: var(--serif);
  color: var(--ink-soft);
  font-size: 1.04rem;
  line-height: 1.4;
}

/* figures — allowed to break out wider than the reading column */
.figure {
  margin: 2.8rem auto;
  max-width: 56rem;
}
.figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: #fff;
  padding: 0.4rem;
}
.figure figcaption {
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.5;
  color: var(--ink-soft);
  margin-top: 0.7rem;
  max-width: 46rem;
}
.figure figcaption .fig { color: var(--signal); }

/* key-findings summary card */
.summary {
  margin: 3rem auto 0;
  max-width: 42rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--paper-2);
  padding: 1.8rem 1.9rem;
}
.summary h3 {
  font-family: var(--mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin-bottom: 1rem;
}
.summary ol { padding-left: 1.2rem; margin: 0; }
.summary li { font-size: 1.06rem; margin-bottom: 0.7rem; }

/* end matter */
.article-foot {
  max-width: 42rem;
  margin: 3.5rem auto 0;
  padding-top: 1.8rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.84rem;
  color: var(--ink-soft);
}
.article-foot a { color: var(--signal); }
.back-link {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.82rem;
  margin-top: 1.4rem;
  color: var(--signal);
}

@media (max-width: 600px) {
  .callout { flex-direction: column; gap: 0.4rem; }
  .figure { margin: 2rem auto; }
}