/* =========================================================================
   blog-cyanotype.css — Folio III · Field Notes
   Extends css/cyanotype.css. Owns blog.html (the index) and every
   blog/*.html post page.

   Sections:
     1. Folio III header block
     2. Section headings
     3. § Field Notes — single-column journal cards
     4. § Field Notes — see-also list
     5. § From the Stacks — denser 2-col grid
     6. Vietnamese [VI] tag
     7. Back-to-home link
     8. Responsive
   ========================================================================= */


/* 1. Folio III header block ---------------------------------------------- */

.folio-block {
  margin: 18px 0 38px;
}
.folio-block .plate-no { margin-bottom: 14px; }
.folio-block .folio-title {
  font-size: clamp(54px, 7vw, 92px);
  margin-bottom: 26px;
}
.folio-block .folio-title em {
  font-style: italic;
  font-weight: 400;
  color: var(--fg-mute);
}
.folio-block .folio-subtitle {
  margin-bottom: 0;
  border-top: none;
  padding-top: 0;
  max-width: 720px;
}


/* 2. Section headings ---------------------------------------------------- */

.folio-content section { margin-bottom: var(--sp-16); scroll-margin-top: 32px; }
.folio-content section > h2 {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 300;
  font-size: clamp(28px, 3.4vw, 38px);
  letter-spacing: -0.005em;
  color: var(--fg);
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: var(--sp-7);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.folio-content section > h2::before {
  content: attr(data-numeral);
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--fg-mute);
  min-width: 36px;
}
.folio-content section > h2::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
  margin-left: 6px;
  align-self: center;
}


/* 3. § Field Notes — single-column journal -------------------------------- */

.field-notes { display: flex; flex-direction: column; }

.field-note {
  display: grid;
  grid-template-columns: 96px 1fr 160px;
  gap: var(--sp-7);
  align-items: start;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}
.field-note:first-child { padding-top: var(--sp-2); }
.field-note:last-child  { border-bottom: none; }

/* Datestamp (left column) */
.field-note .datestamp {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  text-transform: uppercase;
  color: var(--fg-mute);
  line-height: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: var(--sp-1);
}
.field-note .datestamp .d-day {
  font-size: 28px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--fg);
}
.field-note .datestamp .d-mon {
  font-size: var(--text-xs);
  letter-spacing: 0.28em;
  padding-top: 6px;
  border-top: 1px solid var(--line);
}

/* Body (middle column) */
.field-note .body { min-width: 0; }
.field-note .body h3 {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 400;
  font-size: clamp(20px, 2.2vw, 24px);
  line-height: 1.25;
  letter-spacing: -0.005em;
  margin-bottom: var(--sp-2);
}
.field-note .body h3 a {
  color: var(--fg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) ease, color var(--t-fast) ease;
}
.field-note .body h3 a:hover { border-bottom-color: var(--line); }
.field-note .body h3 a:visited { color: var(--accent-visited); }

.field-note .meta {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: var(--sp-3);
}
.field-note .meta .sep { opacity: 0.5; margin: 0 6px; }

.field-note .desc {
  font-family: 'Fraunces', serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--fg);
  max-width: 60ch;
}

/* Thumbnail (right column) — plate-framed specimen, no duotone */
.field-note .thumb {
  position: relative;
  background: var(--plate-bg);
  padding: 6px;
  border: 1px solid var(--plate-rule);
  align-self: start;
}
.field-note .thumb img {
  display: block;
  width: 100%;
  height: 100px;
  object-fit: cover;
}
.field-note .thumb .corner {
  position: absolute;
  width: 10px;
  height: 10px;
  border: 1px solid var(--plate-rule);
  pointer-events: none;
}
.field-note .thumb .corner.tl { top: -1px; left: -1px;  border-right: none; border-bottom: none; }
.field-note .thumb .corner.tr { top: -1px; right: -1px; border-left: none;  border-bottom: none; }
.field-note .thumb .corner.bl { bottom: -1px; left: -1px;  border-right: none; border-top: none; }
.field-note .thumb .corner.br { bottom: -1px; right: -1px; border-left: none;  border-top: none; }


/* 4. See-also list ------------------------------------------------------- */

.see-also {
  margin-top: 14px;
  padding: var(--sp-2) 0 var(--sp-2) 14px;
  border-left: 1px solid var(--line);
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-mute);
  line-height: 1.9;
}
.see-also .see-also-label {
  display: inline-block;
  margin-right: var(--sp-2);
  color: var(--fg);
  letter-spacing: 0.28em;
}
.see-also a {
  color: var(--fg-mute);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}
.see-also a:hover {
  color: var(--fg);
  border-bottom-color: var(--line);
}
.see-also .roman {
  display: inline-block;
  margin-right: var(--sp-1);
  opacity: 0.6;
}
.see-also .sep { opacity: 0.4; margin: 0 6px; }


/* 5. § From the Stacks — denser 2-col grid ------------------------------- */

.stacks-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-7) var(--sp-8);
}

.stack-card {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  align-items: start;
}

.stack-card .thumb {
  position: relative;
  background: var(--plate-bg);
  padding: 5px;
  border: 1px solid var(--plate-rule);
  align-self: start;
}
.stack-card .thumb img {
  display: block;
  width: 100%;
  height: 84px;
  object-fit: cover;
}

.stack-card .body { min-width: 0; }
.stack-card .body h3 {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.3;
  margin-bottom: 6px;
  letter-spacing: -0.005em;
}
.stack-card .body h3 a {
  color: var(--fg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) ease;
}
.stack-card .body h3 a:hover { border-bottom-color: var(--line); }
.stack-card .body h3 a:visited { color: var(--accent-visited); }
.stack-card .body h3 a::after {
  content: " ↗";
  font-family: 'IBM Plex Mono', monospace;
  font-style: normal;
  font-size: 0.7em;
  letter-spacing: 0;
  color: var(--fg-mute);
  opacity: 0.7;
  transition: opacity var(--t-fast) ease;
  margin-left: 2px;
}
.stack-card .body h3 a:hover::after { opacity: 1; }

.stack-card .meta {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-sm);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: var(--sp-2);
  line-height: 1.6;
}
.stack-card .meta .sep { opacity: 0.5; margin: 0 5px; }

.stack-card .desc {
  font-family: 'Fraunces', serif;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--fg);
}


/* 6. Vietnamese [VI] tag ------------------------------------------------- */

.lang-tag {
  display: inline-block;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-sm);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-mute);
  border: 1px solid var(--line);
  padding: 1px 5px;
  margin-left: 6px;
  vertical-align: 2px;
  cursor: help;
  border-radius: 2px;
}


/* Reveal — slow print-developing motion ---------------------------------- */

.fade-in {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 900ms var(--ease), transform 900ms var(--ease);
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
}


/* 8. Responsive --------------------------------------------------------- */

@media (max-width: 900px) {
  .field-note { grid-template-columns: 72px 1fr; gap: 18px; }
  .field-note .thumb { display: none; }
  .stacks-grid { grid-template-columns: 1fr; gap: 0; }
}

@media (max-width: 600px) {
  .field-note { grid-template-columns: 1fr; gap: var(--sp-3); }
  .field-note .datestamp {
    flex-direction: row;
    align-items: baseline;
    gap: 10px;
    padding-top: 0;
  }
  .field-note .datestamp .d-day { font-size: 16px; }
  .field-note .datestamp .d-mon { border-top: none; padding-top: 0; }
  .stack-card { grid-template-columns: 72px 1fr; gap: var(--sp-3); }
  .stack-card .thumb img { height: 64px; }
}


/* =========================================================================
   POST PAGE — every blog/*.html plate inside Folio III
   ========================================================================= */

/* 9. Post hero ------------------------------------------------------------ */

.post-page .folio-content { max-width: 760px; }

.post {
  display: block;
  margin-top: 6px;
}

.post-hero { margin: 6px 0 44px; }
.post-hero .plate-no { margin-bottom: 18px; }
.post-hero .post-title {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 300;
  font-size: clamp(36px, 5.2vw, 60px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin: 0 0 var(--sp-6);
  max-width: 18ch;
}
.post-hero .post-title em {
  font-style: italic;
  color: var(--fg-mute);
}
.post-hero .post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  column-gap: 14px;
  row-gap: 6px;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--fg-mute);
  padding-top: 14px;
  border-top: 1px solid var(--line);
}
.post-hero .post-meta .sep { opacity: 0.4; }
.post-hero .post-meta .post-date { color: var(--fg); }


/* 10. Post prose --------------------------------------------------------- */

.post-prose {
  font-family: 'Fraunces', serif;
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.72;
  color: var(--fg);
}
.post-prose > * + * { margin-top: 1.15em; }

.post-prose > p,
.post-prose > ul,
.post-prose > ol,
.post-prose > h3,
.post-prose > h4,
.post-prose > .step,
.post-prose > .spoiler {
  max-width: 65ch;
}
.post-prose > .table-common,
.post-prose > .blog-image,
.post-prose > .code-window,
.post-prose > .audio-plate,
.post-prose > .accordion,
.post-prose > figure,
.post-prose > .note,
.post-prose > .blog-video {
  max-width: 100%;
  width: 100%;
}
/* Paragraphs that wrap a display equation are display elements, not prose —
   lift them out of the 65ch measure so wide equations breathe. The :has()
   match becomes true once MathJax replaces \[...\] with mjx-container. */
.post-prose > p:has(> mjx-container[display="true"]) {
  max-width: 100%;
  text-align: center;
}

.post-prose h3 {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 400;
  font-size: clamp(22px, 2.6vw, 28px);
  letter-spacing: -0.005em;
  color: var(--fg);
  margin: 2.4em 0 0.45em;
  padding-top: 1.1em;
  border-top: 1px solid var(--line);
}
.post-prose h3:first-child,
.post-prose > .spoiler + h3 { border-top: none; padding-top: 0; margin-top: 0.6em; }

.post-prose h4 {
  font-family: 'Fraunces', serif;
  font-style: normal;
  font-weight: 500;
  font-size: clamp(17px, 1.7vw, 19px);
  letter-spacing: 0;
  color: var(--fg);
  margin: 2em 0 0.4em;
}

.post-prose h5 {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin: 1.6em 0 0.4em;
}

.post-prose p { margin: 0; }
.post-prose strong { font-weight: 500; color: var(--fg); }
.post-prose em { font-style: italic; }

.post-prose a {
  color: var(--accent);
  border-bottom: 1px solid var(--line);
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}
.post-prose a:hover {
  color: var(--fg);
  border-bottom-color: var(--fg);
}

.post-prose code {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.86em;
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--fg);
}

/* Lists — cyanotype markers */
.post-prose ul,
.post-prose ol {
  list-style: none;
  padding-left: 0;
  margin: 0.4em 0;
}
.post-prose ul li,
.post-prose ol li { margin: 0.45em 0; }

.post-prose ul li {
  position: relative;
  padding-left: 1.4em;
}
.post-prose ul li::before {
  content: "";
  position: absolute;
  left: 0.25em;
  top: 0.7em;
  width: 8px;
  height: 1px;
  background: var(--fg-mute);
}

.post-prose ol {
  /* Supports continued numbering via inline style="--ol-start: N-1" on the
     ol element when an ol is split across non-list elements (code-windows,
     images). HTML's `start` attribute is informational here; the CSS
     counter is what renders the leading numeral. */
  counter-reset: post-ol var(--ol-start, 0);
}
.post-prose ol:not(.sub-plates) li {
  position: relative;
  padding-left: 2.4em;
  counter-increment: post-ol;
}
.post-prose ol:not(.sub-plates) li::before {
  content: counter(post-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.45em;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--fg-mute);
}


/* 11. Drop cap (.lede) --------------------------------------------------- */

.post-prose .lede::first-letter {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 300;
  font-size: 4.6em;
  line-height: 0.86;
  float: left;
  padding: 0.08em 0.14em 0 0;
  margin: 0.04em 0.08em -0.08em 0;
  color: var(--ink);
}
[data-theme="night"] .post-prose .lede::first-letter { color: var(--ink-soft); }


/* 12. Editorial note ----------------------------------------------------- */

.post-prose .spoiler {
  display: block;
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 0.94rem;
  line-height: 1.65;
  color: var(--fg-mute);
  padding: 14px 0 14px 18px;
  border-left: 2px solid var(--plate-rule);
  max-width: 60ch;
  margin: var(--sp-6) 0 var(--sp-8);
}


/* 13. Code window -------------------------------------------------------- */

.code-window {
  background: var(--plate-bg);
  color: var(--plate-fg);
  border: 1px solid var(--plate-rule);
  margin: var(--sp-6) 0;
  max-width: 100%;
  overflow: hidden;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
}
.code-window .console {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: var(--sp-2) 14px;
  border-bottom: 1px solid var(--plate-rule);
  font-size: var(--text-xs);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--fg-mute);
}
.code-window .console .red,
.code-window .console .orange,
.code-window .console .green {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 0;
  background: var(--plate-fg);
}
.code-window .console .orange { opacity: 0.6; }
.code-window .console .green  { opacity: 0.35; }
.code-window .console::after {
  content: "stdout";
  margin-left: auto;
  opacity: 0.7;
}
.code-window pre.code-content {
  margin: 0;
  padding: var(--sp-4) 18px;
  overflow-x: auto;
  background: transparent;
  font-size: 13px;
  line-height: 1.55;
  color: var(--plate-fg);
  white-space: pre;
}
.code-window pre.code-content code {
  background: none;
  padding: 0;
  border: none;
  border-radius: 0;
  color: inherit;
  font-size: inherit;
}


/* 14. Post — series sub-page eyebrow ------------------------------------ */

.post-hero .series-tag {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: 10px;
}
.post-hero .series-tag a {
  color: var(--fg);
  border-bottom: 1px solid var(--line);
  transition: border-color var(--t-fast) ease;
}
.post-hero .series-tag a:hover { border-bottom-color: var(--fg); }


/* 15. CTA button (outlined, mono small caps) ----------------------------- */

.post-prose .button {
  display: inline-block;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 9px 14px var(--sp-2);
  margin: 10px 0;
  text-decoration: none;
  transition: border-color var(--t-fast) ease,
              background var(--t-fast) ease,
              color var(--t-fast) ease;
}
.post-prose .button::after {
  content: "↗";
  margin-left: var(--sp-2);
  opacity: 0.7;
  font-size: 0.9em;
}
.post-prose .button:hover {
  color: var(--fg);
  border-color: var(--fg);
  background: var(--plate-bg);
}


/* 16. Data table (.table-common) ---------------------------------------- */

.post-prose .table-common {
  width: 100%;
  margin: var(--sp-6) 0;
  border-collapse: collapse;
  font-family: 'Fraunces', serif;
  font-size: 0.92rem;
  line-height: 1.45;
  border-top: 1px solid var(--fg-mute);
  border-bottom: 1px solid var(--fg-mute);
}
.post-prose .table-common thead th {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-mute);
  text-align: left;
  padding: var(--sp-3) 14px;
  border-bottom: 1px solid var(--fg-mute);
  vertical-align: bottom;
}
.post-prose .table-common tbody td {
  padding: var(--sp-3) 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  color: var(--fg);
}
.post-prose .table-common tbody tr:last-child td { border-bottom: none; }
/* Opt-in mono cells (use .shape for tuples / .numeric for values).
   Default cells stay in Fraunces so text-heavy columns like "Description"
   in the AWS post read like prose. */
.post-prose .table-common td.shape,
.post-prose .table-common td.numeric {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.86rem;
  font-variant-numeric: tabular-nums;
}
.post-prose .table-common td.shape { white-space: nowrap; }
.post-prose .table-common td.numeric { text-align: right; }

.post-prose .table-common caption {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-mute);
  text-align: left;
  caption-side: top;
  padding: 0 0 var(--sp-3);
}


/* Matrix component — laid out as a proper grid of numbers in tabular
   monospace. Bracket glyphs frame the grid via ::before/::after pseudo
   elements, drawn from --plate-rule so they theme-swap. */
.post-prose .matrix {
  display: inline-grid;
  grid-auto-flow: row;
  grid-template-columns: repeat(var(--cols, 3), minmax(0, auto));
  column-gap: 14px;
  row-gap: var(--sp-1);
  align-items: baseline;
  position: relative;
  padding: var(--sp-1) var(--sp-3);
  margin: 2px 0;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.84rem;
  line-height: 1.4;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--fg);
}
.post-prose .matrix > span { display: block; min-width: 1.5em; }
.post-prose .matrix::before,
.post-prose .matrix::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 4px;
  border: 1px solid var(--plate-rule);
}
.post-prose .matrix::before { left: 0;  border-right: none; }
.post-prose .matrix::after  { right: 0; border-left: none; }


/* 17. Inline figure (.blog-image, optional <figure> + <figcaption>) ----- */

.post-prose .blog-image {
  display: block;
  max-width: 100%;
  height: auto;
  margin: var(--sp-7) auto;
  background: var(--plate-bg);
  padding: 14px;
  border: 1px solid var(--plate-rule);
  box-shadow: var(--plate-shadow);
}
/* Size modifiers — use when a figure earns its place but shouldn't dominate.
   .small for portraits / personal photos / mascots (~240px),
   .medium for diagrams that read well at half-width (~420px). */
.post-prose .blog-image.small  { max-width: 240px; padding: 10px; }
.post-prose .blog-image.medium { max-width: 420px; padding: var(--sp-3); }

/* Figure wrapper + figcaption — for diagrams that need a label like
   "Diagram A — a single EC2 instance accepting HTTP traffic". */
.post-prose figure {
  margin: var(--sp-7) 0;
}
.post-prose figure .blog-image { margin: 0 auto; }
.post-prose figcaption {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-mute);
  text-align: center;
  margin-top: var(--sp-3);
  max-width: 60ch;
  margin-left: auto;
  margin-right: auto;
}

/* Inline video — same plate-frame treatment as .blog-image */
.post-prose .blog-video {
  display: block;
  max-width: 100%;
  margin: var(--sp-7) auto;
  background: var(--plate-bg);
  padding: 14px;
  border: 1px solid var(--plate-rule);
  box-shadow: var(--plate-shadow);
}
.post-prose .blog-video video {
  display: block;
  width: 100%;
  height: auto;
}
.post-prose .blog-video .video-caption {
  margin: var(--sp-3) 0 0;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-mute);
  text-align: center;
}


/* 18. Numbered step paragraph (.step) ----------------------------------- */

.post-prose .step {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-weight: 500;
  font-size: 1.06rem;
  color: var(--fg);
  margin-top: 1.8em;
  padding-left: 14px;
  border-left: 2px solid var(--plate-rule);
}


/* 19. MathJax display blocks -------------------------------------------- */

.post-prose mjx-container[display="true"] {
  margin: 1.4em 0 !important;
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
}
.post-prose mjx-container { color: var(--fg); }
.post-prose p:has(> mjx-container[display="true"]) {
  margin: 1.4em 0;
}


/* 20. Accordion (click-to-toggle) — uses scripts.js toggleAccordion() ---- */

.post-prose .accordion {
  margin: var(--sp-6) 0;
  border: 1px solid var(--plate-rule);
  background: transparent;
}
.post-prose .accordion-heading {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-weight: 500;
  font-size: var(--text-sm);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg);
  padding: 14px 18px 13px 42px;
  margin: 0;
  cursor: pointer;
  position: relative;
  background: transparent;
  user-select: none;
  transition: background var(--t-fast) ease;
}
.post-prose .accordion-heading:hover { background: rgba(10, 47, 92, 0.04); }
[data-theme="night"] .post-prose .accordion-heading:hover { background: rgba(244, 236, 213, 0.04); }

.post-prose .accordion-heading::before,
.post-prose .accordion-heading::after {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  background: var(--fg-mute);
  transition: transform 220ms var(--ease), background var(--t-fast) ease;
}
.post-prose .accordion-heading::before {
  width: 12px;
  height: 1px;
  transform: translateY(-0.5px);
}
.post-prose .accordion-heading::after {
  width: 1px;
  height: 12px;
  transform: translate(5.5px, -6px);
  transform-origin: center;
}
.post-prose .accordion.open .accordion-heading::after {
  transform: translate(5.5px, -6px) scaleY(0);
}
.post-prose .accordion.open .accordion-heading::before,
.post-prose .accordion.open .accordion-heading::after {
  background: var(--fg);
}

.post-prose .accordion-content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  padding: 0 22px;
  border-top: 1px solid transparent;
  transition:
    max-height 360ms var(--ease),
    opacity 220ms var(--ease),
    padding 280ms var(--ease),
    border-top-color 200ms var(--ease);
}
.post-prose .accordion.open .accordion-content {
  max-height: 2000px;
  opacity: 1;
  padding: 14px 22px 18px;
  border-top-color: var(--plate-rule);
  transition:
    max-height 420ms var(--ease),
    opacity 260ms var(--ease) 80ms,
    padding 320ms var(--ease),
    border-top-color 200ms var(--ease);
}
.post-prose .accordion-content > * { max-width: 65ch; }
.post-prose .accordion-content > *:first-child { margin-top: 0; }

@media (prefers-reduced-motion: reduce) {
  .post-prose .accordion-content,
  .post-prose .accordion.open .accordion-content,
  .post-prose .accordion-heading::before,
  .post-prose .accordion-heading::after { transition: none; }
}


/* 21a. Note / analogy callout (more prominent than .spoiler) ------------ */

.post-prose .note {
  background: var(--plate-bg);
  color: var(--plate-fg);
  border: 1px solid var(--plate-rule);
  padding: 18px 22px;
  margin: var(--sp-7) 0;
  font-family: 'Fraunces', serif;
  font-style: italic;
  line-height: 1.7;
}
.post-prose .note .note-label {
  display: block;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-style: normal;
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: 10px;
}
.post-prose .note p { margin: 0; max-width: 65ch; }


/* 21b. Footnote / update block ----------------------------------------- */

.post-prose .update {
  margin: 44px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--plate-rule);
}
.post-prose .update p {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-sm);
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--fg-mute);
}


/* 21c. References section ---------------------------------------------- */

.post-prose .references {
  margin-top: var(--sp-12);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--plate-rule);
}
.post-prose .references h2 {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-weight: 500;
  font-size: var(--text-sm);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin: 0 0 var(--sp-4);
}
.post-prose .references ol {
  counter-reset: ref-ol 0;
  margin: 0;
  padding-left: 0;
  list-style: none;
}
.post-prose .references ol li {
  position: relative;
  padding-left: 2.4em;
  margin: 0.6em 0;
  font-size: 0.9rem;
  line-height: 1.6;
  counter-increment: ref-ol;
}
.post-prose .references ol li::before {
  content: counter(ref-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.35em;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--fg-mute);
}


/* 21d. h4.step combined — step heading variant ------------------------- */

.post-prose h4.step {
  font-style: italic;
  padding-left: 14px;
  border-left: 2px solid var(--plate-rule);
}


/* 21. Series sub-plates listing (parent series pages) ------------------- */

.post-prose .sub-plates {
  list-style: none;
  padding: 22px 0;
  margin: 30px 0;
  border-top: 1px solid var(--plate-rule);
  border-bottom: 1px solid var(--plate-rule);
}
.post-prose .sub-plates::before {
  content: "Plates in this series";
  display: block;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: var(--sp-4);
}
.post-prose .sub-plates li {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: var(--sp-4);
  align-items: baseline;
  padding-left: 0;
  margin: var(--sp-2) 0;
}
.post-prose .sub-plates .sp-no {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-mute);
}
.post-prose .sub-plates .sp-title {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.35;
  color: var(--fg);
}
.post-prose .sub-plates a {
  color: var(--fg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) ease;
}
.post-prose .sub-plates a:hover { border-bottom-color: var(--line); }
.post-prose .sub-plates li.coming-soon { opacity: 0.55; font-style: italic; }


/* 22. Post responsive --------------------------------------------------- */

@media (max-width: 720px) {
  .post-hero .post-title { max-width: none; }
  .post-prose { font-size: 1rem; line-height: 1.65; }
  .post-prose .lede::first-letter { font-size: 3.8em; }
  .code-window pre.code-content { font-size: 12px; padding: 14px var(--sp-4); }
  .post-prose .table-common { font-size: 0.86rem; }
  .post-prose .table-common thead th,
  .post-prose .table-common tbody td { padding: 10px 10px; }
}