/* ==========================================================================
   BLOG — landing section, blog index grid and article pages.
   Only composition lives here; every colour/space value comes from tokens.css.
   ========================================================================== */

/* --- Post cards (landing section, blog index, "keep reading") ----------- */
/* Cards carry their own dark surface, so they read the same on the dark mesh,
   on light sections, and on mobile where light sections flip dark. */
.blog-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-10);
}
.blog-card {
  display: flex; flex-direction: column;
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--t-base) ease, transform var(--t-slow) var(--ease-out), box-shadow var(--t-base) ease;
}
.blog-card:hover, .blog-card:focus-visible {
  border-color: var(--color-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.blog-card:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.blog-card__media { aspect-ratio: 16 / 10; overflow: hidden; background-color: var(--color-surface-3); }
.blog-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--t-slow) var(--ease-out); }
.blog-card:hover .blog-card__media img { transform: scale(1.05); }
.blog-card__body { display: flex; flex-direction: column; gap: var(--space-3); flex: 1; padding: var(--space-6); }
.blog-card .blog-card__meta {
  display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center;
  font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-text-dim);
}
.blog-card__cat { color: var(--color-primary); font-weight: 700; }
.blog-card__time::before { content: "·"; margin-right: var(--space-3); color: var(--color-text-dim); }
.blog-card .blog-card__title {
  font-size: var(--text-xl); line-height: 1.3; letter-spacing: -0.01em;
  color: var(--color-text);
}
.blog-card .work-link { padding-top: var(--space-4); }
.blog-all { text-align: right; margin-top: var(--space-8); }

@media (min-width: 768px) {
  .blog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .blog-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* --- Landing section ---------------------------------------------------- */
.section-blog { border-top: 1px solid var(--color-border); }

/* --- Blog index --------------------------------------------------------- */
.page-blog .section-hero { padding-bottom: var(--space-16); }

/* --- Article hero ------------------------------------------------------- */
.post-hero {
  position: relative; overflow: hidden;
  min-height: 72vh; display: flex; align-items: flex-end;
  padding: calc(var(--navbar-height) + var(--space-16)) 0 var(--space-16);
}
.post-hero__bg { position: absolute; inset: 0; z-index: 0; background-size: cover; background-position: center; }
.post-hero__bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(15, 17, 18, 0.45) 0%, rgba(15, 17, 18, 0.78) 55%, var(--color-bg) 100%);
}
.post-hero > .container { position: relative; z-index: 1; width: 100%; }
.post-hero__crumbs {
  display: flex; gap: var(--space-3); align-items: center;
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-primary); margin-bottom: var(--space-5);
}
.post-hero__crumbs a { color: var(--color-text); transition: color var(--t-fast) ease; }
.post-hero__crumbs a:hover { color: var(--color-primary); }
.post-hero__crumbs span { color: var(--color-text-dim); }
.post-hero h1 { font-size: clamp(2rem, 4.6vw, 3.4rem); line-height: 1.1; letter-spacing: -0.03em; max-width: 24ch; }
.post-hero__lede { font-size: var(--text-lg); color: rgba(252, 252, 252, 0.78); max-width: 68ch; margin-top: var(--space-6); line-height: 1.7; }
.post-hero__meta { font-size: var(--text-sm); color: var(--color-text-dim); margin-top: var(--space-6); }

/* prev / next post, along the bottom of the hero */
.post-pager {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: var(--space-10); padding-top: var(--space-6);
  border-top: 1px solid rgba(252, 252, 252, 0.14);
}
.post-pager__link {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-weight: 600; font-size: var(--text-base); color: var(--color-primary);
  transition: color var(--t-fast) ease;
}
.post-pager__link--next { margin-left: auto; }
.post-pager__chev { font-size: 1.5rem; line-height: 1; transition: transform var(--t-base) var(--ease-out); }
.post-pager__link:hover { color: var(--color-primary-light); }
.post-pager__link--prev:hover .post-pager__chev { transform: translateX(-4px); }
.post-pager__link--next:hover .post-pager__chev { transform: translateX(4px); }
.post-pager__link:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 4px; border-radius: var(--radius-sm); }

/* --- Article layout: contents rail + body ------------------------------- */
.post-section { padding-top: var(--space-16); }
.post-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-10); }
.post-toc {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}
.post-toc .section-label { margin-bottom: var(--space-4); }
.post-toc ol { display: flex; flex-direction: column; gap: var(--space-3); counter-reset: toc; }
.post-toc li { counter-increment: toc; display: flex; gap: var(--space-3); font-size: var(--text-sm); line-height: 1.45; }
.post-toc li::before { content: counter(toc, decimal-leading-zero); color: var(--color-primary); font-weight: 600; font-variant-numeric: tabular-nums; }
.post-toc a { color: var(--color-text-muted); transition: color var(--t-fast) ease; }
.post-toc a:hover { color: var(--color-text); }

@media (min-width: 1024px) {
  .post-layout { grid-template-columns: 260px minmax(0, 1fr); gap: var(--space-16); align-items: start; }
  .post-toc {
    position: sticky; top: calc(var(--navbar-height) + var(--space-8));
    max-height: calc(100vh - var(--navbar-height) - var(--space-16)); overflow-y: auto;
    background: none; border: 0; border-left: 1px solid var(--color-border); border-radius: 0;
    padding: 0 0 0 var(--space-6);
  }
}

/* --- Article typography ------------------------------------------------- */
.post-body { max-width: 740px; min-width: 0; }
.post-body > * + * { margin-top: var(--space-5); }
.post-body p, .post-body li { font-size: 1.0625rem; line-height: 1.8; color: rgba(252, 252, 252, 0.74); }
.post-body h2 {
  font-size: var(--text-2xl); line-height: 1.25;
  margin-top: var(--space-16); padding-top: var(--space-2);
  scroll-margin-top: calc(var(--navbar-height) + var(--space-6));
}
.post-body > h2:first-child { margin-top: 0; }
.post-body h3 { font-size: var(--text-lg); line-height: 1.4; margin-top: var(--space-10); }
.post-body h2 + *, .post-body h3 + * { margin-top: var(--space-4); }
.post-body strong { color: var(--color-text); font-weight: 600; }
/* base.css repurposes <em> as a yellow highlight; in prose it is plain italic
   (journal titles, emphasis). */
.post-body em { font-style: italic; font-weight: inherit; color: inherit; }

.post-body a:not(.btn) { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.post-body a:not(.btn):hover { color: var(--color-primary-light); }
.post-body ul, .post-body ol { padding-left: var(--space-6); display: flex; flex-direction: column; gap: var(--space-3); }
.post-body ul { list-style: none; }
.post-body ul > li { position: relative; }
.post-body ul > li::before {
  content: ""; position: absolute; left: calc(-1 * var(--space-5)); top: 0.75em;
  width: 6px; height: 6px; border-radius: 50%; background-color: var(--color-primary);
}
.post-body ol { list-style: decimal; }
.post-body ol > li::marker { color: var(--color-primary); font-weight: 700; }

/* code */
.post-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.875em; color: var(--color-primary-light);
  background-color: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); padding: 0.1em 0.35em;
}
.post-body pre {
  background-color: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: var(--space-5); overflow-x: auto;
}
.post-body pre code { background: none; border: 0; padding: 0; color: var(--color-text); font-size: var(--text-sm); line-height: 1.7; }

/* former tables: a bullet summary on a dark card */
.post-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-8);
}
.post-body .post-card { margin-top: var(--space-6); }
.post-card > ul { gap: var(--space-4); }
.post-card > ul > li + li { padding-top: var(--space-4); border-top: 1px solid var(--color-border); }
.post-card > ul > li::before { top: calc(0.75em + var(--space-4)); }
.post-card > ul > li:first-child::before { top: 0.75em; }

/* photos between sections */
.post-body .post-figure { margin-top: var(--space-12); }
.post-figure img {
  width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover;
  border-radius: var(--radius-lg); border: 1px solid var(--color-border);
}
.post-body .post-figure + h2 { margin-top: var(--space-10); }

/* closing call to action */
.post-cta {
  margin-top: var(--space-12);
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border-hover);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex; flex-direction: column; gap: var(--space-5); align-items: flex-start;
}
.post-cta p { color: var(--color-text); font-size: var(--text-lg); }

/* in-text citation: a small "reference" link instead of the full DOI */
.post-body a.ref-link {
  display: inline-block; vertical-align: 0.15em;
  font-size: 0.7em; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; line-height: 1;
  color: var(--color-text-dim); text-decoration: none;
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  padding: 0.3em 0.45em;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}
.post-body a.ref-link:hover { color: var(--color-primary); border-color: var(--color-border-hover); }

/* references + primary sources: collapsed dropdowns */
.post-refs { margin-top: var(--space-16); padding-top: var(--space-8); border-top: 1px solid var(--color-border); display: flex; flex-direction: column; gap: var(--space-3); }
.post-body .post-refs { margin-top: var(--space-16); }
.post-refs__group { border: 1px solid var(--color-border); border-radius: var(--radius); background-color: var(--color-surface); }
.post-refs__group[open] { border-color: var(--color-border-hover); }
.post-refs__group summary {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-4) var(--space-5); cursor: pointer; list-style: none;
  font-family: var(--font-heading); font-weight: 600; font-size: var(--text-base); color: var(--color-text);
}
.post-refs__group summary::-webkit-details-marker { display: none; }
.post-refs__group summary::after {
  content: "+"; margin-left: auto; font-size: 1.25rem; line-height: 1; color: var(--color-primary);
  transition: transform var(--t-base) var(--ease-out);
}
.post-refs__group[open] summary::after { transform: rotate(45deg); }
.post-refs__group summary:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: var(--radius); }
.post-refs__count {
  font-family: var(--font-body); font-size: var(--text-xs); font-weight: 600; color: var(--color-text-dim);
  border: 1px solid var(--color-border); border-radius: 999px; padding: 0.1em 0.6em;
}
.post-refs ol, .post-refs ul { margin: 0; padding: 0 var(--space-5) var(--space-5) calc(var(--space-5) + var(--space-5)); gap: var(--space-2); }
.post-refs li { font-size: var(--text-sm); line-height: 1.65; color: var(--color-text-muted); }
.post-refs a { overflow-wrap: anywhere; }

/* keep reading */
.post-more h2 { text-align: left; }

@media (max-width: 767px) {
  .post-hero { min-height: 0; padding-top: calc(var(--navbar-height) + var(--space-12)); padding-bottom: var(--space-10); }
  .post-hero__lede { font-size: var(--text-base); }
  .post-pager { margin-top: var(--space-8); }
  .post-body p, .post-body li { font-size: var(--text-base); }
  .post-cta { padding: var(--space-6); }
  .post-card { padding: var(--space-5); }
  .post-body .post-figure { margin-top: var(--space-10); }
  .blog-all { text-align: left; }
}

#blog-posts .blog-grid { margin-top: 0; }
.post-hero__meta a { color: var(--color-text); text-decoration: underline; text-underline-offset: 3px; }
.post-hero__meta a:hover { color: var(--color-primary); }