/* ============================================================
   blog.css — long-form post layout.
   All tokens come from ../assets/site.css; this file only
   describes the article page: masthead extras, header, body
   grid, drop cap, pullquotes, marginalia, prev/next rail.
   ============================================================ */

/* ---------- Masthead extras (post pages) ---------- */

.masthead-back {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: var(--text-folio);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  transition: color var(--dur-fast) ease;
}

.masthead-back:hover,
.masthead-back:focus-visible { color: var(--copper-text); }

.masthead-center {
  font-family: var(--font-mono);
  font-size: var(--text-folio);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  text-align: center;
  white-space: nowrap;
}

/* ---------- Post shell & header ---------- */

.post-shell {
  max-width: 1080px;
  margin-inline: auto;
  padding: calc(var(--masthead-h) + clamp(48px, 9vh, 104px)) var(--gutter) 0;
}

.post-hero {
  margin-top: var(--space-l);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: clamp(32px, 5vw, 72px);
  align-items: end;
}

.post-title {
  font-size: clamp(48px, 7vw, 96px);
  font-weight: 320;
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.post-title em {
  font-style: italic;
  color: var(--copper);
}

.post-dek {
  margin-top: var(--space-m);
  font-size: var(--text-lede);
  font-style: italic;
  line-height: 1.65;
  color: var(--ink-3);
  max-width: 54ch;
}

.toc {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-left: 1px solid var(--rule);
  padding-left: 22px;
  padding-block: 6px;
}

.toc-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-folio);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper-text);
  margin-bottom: 4px;
}

.toc a {
  font-size: 15px;
  color: var(--ink-2);
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 0% 1px;
  background-repeat: no-repeat;
  background-position: left calc(100% - 0.08em);
  transition: background-size 250ms var(--ease-out), color var(--dur-fast) ease;
  align-self: flex-start;
  padding-bottom: 2px;
}

.toc a:hover,
.toc a:focus-visible {
  color: var(--ink);
  background-size: 100% 1px;
}

/* ---------- Post body ---------- */

.post-body {
  margin-top: clamp(48px, 8vh, 88px);
  border-top: 1px solid var(--rule-ink);
}

.post-section {
  display: grid;
  grid-template-columns: 180px minmax(0, 58ch);
  gap: clamp(28px, 4vw, 56px);
  padding-block: clamp(44px, 6vh, 64px);
  border-bottom: 1px solid var(--rule);
  scroll-margin-top: calc(var(--masthead-h) + 16px);
}

.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-folio);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--copper-text);
  padding-top: 8px;
}

.section-content h2 {
  font-size: clamp(24px, 2.6vw, 32px);
  font-weight: 380;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.section-content p {
  margin-top: 20px;
  line-height: 1.82;
  color: var(--ink-2);
}

/* drop cap — first paragraph of the first section only */
.post-section:first-of-type .section-content > p:first-of-type::first-letter {
  float: left;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 4.4em;
  line-height: 0.82;
  padding: 0.06em 12px 0 0;
  color: var(--copper);
}

.section-content ul {
  margin-top: var(--space-m);
  border-top: 1px solid var(--rule-soft);
}

.section-content li {
  position: relative;
  padding: 12px 0 12px 26px;
  border-bottom: 1px solid var(--rule-soft);
  line-height: 1.6;
  color: var(--ink-2);
}

.section-content li::before {
  content: "–";
  position: absolute;
  left: 2px;
  color: var(--copper);
}

/* pullquote — hanging copper quote, hairlines only */
.pullquote {
  position: relative;
  margin-top: var(--space-l);
  padding: 26px 0 26px 60px;
  border-block: 1px solid var(--rule);
  font-style: italic;
  font-size: clamp(21px, 2.2vw, 25px);
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.pullquote::before {
  content: "\201C";
  position: absolute;
  left: 0;
  top: 14px;
  font-family: var(--font-serif);
  font-size: 68px;
  line-height: 1;
  color: var(--copper);
}

/* marginalia — editor's note aside */
.marginalia {
  margin-top: var(--space-l);
  border-left: 2px solid var(--verdigris);
  padding: 6px 0 6px 20px;
}

.marginalia .note-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-folio);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--verdigris-text);
}

.marginalia p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ---------- Prev / next rail ---------- */

.post-rail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--rule-ink);
}

.post-rail a {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 30px 10px;
  transition: background var(--dur-fast) ease;
}

.post-rail a:hover,
.post-rail a:focus-visible { background: var(--surface-1); }

.post-rail .rail-next {
  text-align: right;
  align-items: flex-end;
  border-left: 1px solid var(--rule);
  grid-column: 2;
}

.rail-label {
  font-family: var(--font-mono);
  font-size: var(--text-folio);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.rail-title {
  font-size: 18px;
  line-height: 1.35;
  color: var(--ink);
  max-width: 34ch;
}

.post-rail a:hover .rail-label { color: var(--copper-text); }

/* colophon gets breathing room under the rail */
.post-colophon { margin-top: clamp(56px, 9vh, 104px); }

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .masthead-center { display: none; }

  .post-hero {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .toc {
    border-left: none;
    border-top: 1px solid var(--rule);
    padding-left: 0;
    padding-top: 18px;
  }

  .post-section {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .section-label { padding-top: 0; }

  .pullquote { padding-left: 48px; }

  .post-rail { grid-template-columns: 1fr; }
  .post-rail .rail-next {
    grid-column: 1;
    border-left: none;
    border-top: 1px solid var(--rule);
  }
}