/* =============================================================================
   blog.css — minimal, text-first journal (index + post pages).
   Typography and formatting modelled on the reference the user chose:
   Inter for body, Instrument Serif (italic) for display titles, a quiet fixed
   header and a simple footer. Dark palette to sit with the rest of the site.
   Images only ever appear inside a post body, never on the index list.
   ========================================================================== */

:root {
  --void: #010103;
  --navy: #080810;
  --text: #ecedf1;
  --text-2: #c2c8d4;
  --muted: #8b93a4;
  --dim: #626b7d;
  --line: rgba(255, 255, 255, 0.11);
  --accent: #93b4ff;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text', system-ui, sans-serif;
  --serif: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --mono: 'Roboto Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --wrap: 660px;
  --t: 0.25s cubic-bezier(0.25, 0.1, 0.25, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  min-height: 100dvh;
  background: var(--void);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 18px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: #fff; color: #000; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ── Fixed header ──────────────────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px clamp(1.25rem, 6vw, 2.5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--void);
  border-bottom: 1px solid var(--line);
}
.header-logo {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--text);
  transition: opacity var(--t);
}
.header-logo:hover { opacity: 0.7; }
.header-links { display: flex; gap: clamp(0.9rem, 4vw, 1.75rem); flex-shrink: 0; }
.header-links a {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.02em;
  color: var(--muted);
  white-space: nowrap;
  transition: color var(--t);
}
.header-links a:hover { color: var(--text); }

@media (max-width: 420px) {
  .header-logo { font-size: 17px; }
  .header-links a { font-size: 0.7rem; }
}

main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(6rem, 14vw, 8rem) clamp(1.25rem, 6vw, 1.5rem) 4rem;
}

/* ── Index ─────────────────────────────────────────────────────────────────── */
.index-head { margin-bottom: 3.5rem; }
.index-head h1 {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(3rem, 11vw, 4.25rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: 0.75rem;
}
.index-sub {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
  max-width: 42ch;
}
.index-sub a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  text-decoration-color: var(--line);
  transition: text-decoration-color var(--t);
}
.index-sub a:hover { text-decoration-color: var(--accent); }

.post-list { display: flex; flex-direction: column; }
.post-row { padding: 1.6rem 0; border-bottom: 1px solid var(--line); }
.post-row:first-child { border-top: 1px solid var(--line); }
.post-row-date {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 0.4rem;
}
.post-row h2 { margin: 0; font-weight: 400; }
.post-row h2 a {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 5vw, 1.9rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text);
  transition: color var(--t);
  display: block;
}
.post-row:hover h2 a { color: var(--accent); }
.empty {
  padding: 3rem 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.9rem;
  border-top: 1px solid var(--line);
}

/* ── Post page ─────────────────────────────────────────────────────────────── */
.crumbs { margin-bottom: 2rem; }
.crumbs a {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--dim);
  transition: color var(--t);
}
.crumbs a:hover { color: var(--text); }

.post-head { margin-bottom: 3rem; }
.post-head h1 {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(2.25rem, 7vw, 2.5rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: 0.5rem;
}
.post-meta {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.dot { color: var(--line); }

/* Article body — sizes taken from the reference (18px, serif h2, sans-600 h3). */
.post-body { color: var(--text-2); font-size: 18px; line-height: 1.8; }
.post-body > * + * { margin-top: 24px; }
.post-body p { color: var(--text-2); }
.post-body h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.75rem;
  letter-spacing: -0.02em;
  color: #fff;
  margin-top: 56px;
  margin-bottom: 16px;
  line-height: 1.2;
  scroll-margin-top: 6rem;
}
.post-body h2 + * { margin-top: 0; }
.post-body h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  color: #fff;
  margin-top: 36px;
  margin-bottom: 10px;
  scroll-margin-top: 6rem;
}
.post-body h3 + * { margin-top: 0; }
.post-body a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  text-decoration-color: var(--line);
  transition: text-decoration-color var(--t);
}
.post-body a:hover { text-decoration-color: var(--text); }
.post-body strong { color: #fff; font-weight: 600; }
.post-body em { font-family: var(--serif); font-style: italic; font-size: 1.08em; }
.post-body ul, .post-body ol { padding-left: 1.3rem; display: flex; flex-direction: column; gap: 0.5rem; }
.post-body li { color: var(--text-2); }
.post-body li::marker { color: var(--dim); }
.post-body blockquote {
  border-left: 2px solid rgba(255, 255, 255, 0.25);
  padding-left: 1.5rem;
  margin: 2.5rem 0;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.5rem;
  line-height: 1.4;
  color: #fff;
}
/* Images live inside a post body only. */
.post-body img { margin: 2.5rem auto; border: 1px solid var(--line); border-radius: 2px; }
.post-body figure { margin: 2.5rem 0; }
.post-body figcaption {
  margin-top: 0.75rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--dim);
  text-align: center;
}
.post-body hr { border: 0; border-top: 1px solid var(--line); margin: 3rem 0; }
.post-body code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: rgba(255, 255, 255, 0.07);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}
.post-body pre {
  background: #05060d;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1.25rem 1.4rem;
  overflow-x: auto;
  margin: 2rem 0;
  font-size: 0.88rem;
  line-height: 1.6;
}
.post-body pre code { background: none; padding: 0; }
.post-body table { width: 100%; border-collapse: collapse; margin: 2rem 0; font-size: 0.95rem; }
.post-body th, .post-body td { border: 1px solid var(--line); padding: 0.6rem 0.85rem; text-align: left; }
.post-body th { background: rgba(255, 255, 255, 0.04); font-weight: 600; color: #fff; }

/* Tags + repo link */
.post-tags { margin-top: 3rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.post-tags span {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--dim);
  border: 1px solid var(--line);
  padding: 0.3rem 0.65rem;
  border-radius: 2px;
}
.post-repo {
  display: inline-block;
  margin-top: 1.5rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  border-bottom: 1px solid transparent;
}
.post-repo:hover { border-bottom-color: var(--accent); }

/* Soft CTA */
.post-cta { margin-top: 4rem; padding-top: 2.5rem; border-top: 1px solid var(--line); }
.post-cta h2 {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 1.75rem;
  color: #fff;
}
.post-cta p { margin-top: 0.75rem; color: var(--muted); max-width: 46ch; }
.cta-row { margin-top: 1.5rem; display: flex; flex-wrap: wrap; gap: 0.75rem; }
.btn {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  padding: 0.7rem 1.3rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  transition: all var(--t);
}
.btn:hover { background: #fff; color: #000; border-color: #fff; }
.btn.ghost { opacity: 0.72; }
.btn.ghost:hover { opacity: 1; }

/* Prev / next */
.post-nav { margin-top: 3rem; display: grid; grid-template-columns: 1fr; gap: 0.75rem; }
@media (min-width: 620px) { .post-nav { grid-template-columns: 1fr 1fr; } }
.rel-card { border: 1px solid var(--line); padding: 1rem 1.25rem; border-radius: 2px; transition: border-color var(--t); }
.rel-card:hover { border-color: rgba(255, 255, 255, 0.28); }
.rel-card span {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim);
}
.rel-card strong { display: block; margin-top: 0.3rem; font-family: var(--serif); font-weight: 400; font-size: 1.15rem; color: #fff; }

/* ── Footer ────────────────────────────────────────────────────────────────── */
.site-foot {
  max-width: var(--wrap);
  margin: 4rem auto 0;
  padding: 2rem clamp(1.25rem, 6vw, 1.5rem) 3rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  align-items: center;
}
.foot-credit { font-family: var(--serif); font-style: italic; font-size: 15px; color: var(--muted); }
.foot-links { display: flex; gap: 1.25rem; }
.foot-links a {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--dim);
  transition: color var(--t);
}
.foot-links a:hover { color: var(--text); }

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }