/* Sans-serif reading and headings; monospace for code and data. */
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/ibm-plex-mono-latin-400-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/assets/fonts/ibm-plex-mono-latin-500-normal.woff2') format('woff2');
}
:root {
  --editorial: var(--sans);
  --reading: var(--editorial);
  --reading-size: 19px;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}
body { font-optical-sizing: auto; }

/* The publication has an editorial voice; its controls remain Plex Sans. */
.hero-copy h1 {
  font: 500 clamp(46px, 5.3vw, 70px)/1.08 var(--editorial);
  letter-spacing: -.022em;
  text-wrap: balance;
}
.hero-copy p { font-size: 18px; line-height: 1.7; max-width: 600px; }
.home-directory strong { font-weight: 500; letter-spacing: -.015em; }
.card-copy h3 { font-size: 25px; line-height: 1.3; letter-spacing: -.025em; }
.card-copy p { font-size: 15px; line-height: 1.65; }
.callout-copy blockquote {
  font: 400 clamp(32px, 3.2vw, 46px)/1.25 var(--editorial);
  letter-spacing: -.015em;
  max-width: 820px;
}
.idea-preview p, .ideas-list article p {
  font: 400 clamp(27px, 2.8vw, 36px)/1.35 var(--editorial);
  letter-spacing: -.012em;
}
[data-typography='writing'] .page-intro h1,
[data-typography='ideas'] .page-intro h1 {
  font: 500 clamp(52px, 6.5vw, 82px)/1.05 var(--editorial);
  letter-spacing: -.025em;
}
[data-typography='about'] .about-grid h1 {
  font: 500 clamp(43px, 4.8vw, 65px)/1.1 var(--editorial);
  letter-spacing: -.02em;
}
.about-copy p { font: 400 19px/1.75 var(--sans); }
.about-copy blockquote {
  font: italic 400 26px/1.45 var(--editorial);
  letter-spacing: -.01em;
}

/* Technical titles establish structure; prose is set for sustained reading. */
.article-header h1, .principle-article .article-header h1,
.technical-article .article-header h1, .article-epistemics .article-header h1 {
  font: 500 clamp(38px, 4.3vw, 58px)/1.12 var(--sans);
  letter-spacing: -.03em;
  text-wrap: balance;
}
.article-header h1 em, .technical-article .article-header h1 em {
  font-family: inherit;
  font-size: .94em;
  font-weight: inherit;
  font-style: normal;
}
.article-deck, .principle-article .article-deck {
  font: 400 18px/1.65 var(--sans);
  max-width: 700px;
  color: var(--ink-soft);
}
.prose, .series-body .prose {
  font: 400 var(--reading-size)/1.72 var(--reading);
  letter-spacing: 0;
}
.prose > p:first-child, .series-body .prose > p:first-child,
.series-body .series-afterword > p:first-child {
  font-size: inherit;
  line-height: inherit;
}
.prose p + p { margin-top: 1.05em; }
.prose li { font-size: inherit; }
.prose h2, .series-body .prose h2 {
  font: 500 29px/1.3 var(--sans);
  letter-spacing: -.022em;
  margin: 1.65em 0 .65em;
  text-wrap: balance;
}
.prose h3 { font: 500 23px/1.35 var(--sans); letter-spacing: -.015em; }
.prose strong { font-weight: 600; }
.prose blockquote, .series-body .prose blockquote {
  font: italic 400 27px/1.45 var(--editorial);
  letter-spacing: -.008em;
  padding: 3px 0 3px 25px;
  margin: 32px 0;
  border-left-width: 2px;
}
.prose blockquote + p, .series-body .prose blockquote + p {
  font: inherit;
  color: inherit;
}
.prose blockquote cite { font: 400 13px/1.5 var(--sans); }
.prose code { font-size: .7em; }
.series-body > .prose, .legacy-prose { width: min(700px, calc(100% - 48px)); }

/* Principle chapters share the sans-serif heading system. */
[data-typography='principle'] .article-header h1 {
  font: 500 clamp(43px, 5vw, 68px)/1.08 var(--editorial);
  letter-spacing: -.022em;
}
[data-typography='principle'] .article-header h1 em {
  font-family: var(--editorial);
  font-weight: 400;
  font-style: italic;
  font-size: 1em;
  letter-spacing: inherit;
}
.series-map-card h3 { font: 500 27px/1.2 var(--editorial); letter-spacing: -.01em; }
.series-map-card p { font: 400 15px/1.65 var(--sans); }
.series-map-card { min-height: 275px; }

/* Notes and utilities favor quick scanning. */
[data-typography='note'], [data-typography='utility'] {
  --reading: var(--sans);
  --reading-size: 18px;
}
[data-typography='note'] .article-header h1 { max-width: 790px; font-size: clamp(36px, 4vw, 52px); }
[data-typography='note'] .prose { line-height: 1.8; }
[data-typography='notes'] .note-row strong { font-weight: 500; }
[data-typography='focus'] .project-main h2 { font-size: clamp(33px, 3.5vw, 47px); }

/* Structured evidence retains compact sans text and aligned mono data. */
.context-table, .case-story, .case-heading, .series-directory { font-family: var(--sans); }
.context-table caption, .case-heading h2, .case-story h3 { font-family: var(--sans); }
.case-snapshot dd { font-family: var(--sans); font-variant-numeric: tabular-nums; }
.prose pre, .prose pre code, .case-story pre, .case-story pre code {
  font: 400 12px/1.8 var(--mono);
  letter-spacing: -.01em;
}
.prose pre.source-example {
  margin: 24px 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-deep);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.prose pre.source-example, .prose pre.source-example code {
  font: 400 15px/1.65 var(--sans);
  letter-spacing: 0;
}
.prose pre.source-example code { padding: 0; background: none; }
.prose .nested-outline { padding-left: 1.1em; }
.prose .nested-outline ul { margin: .35em 0 .6em; padding-left: 1.15em; border-left: 1px solid var(--line); }
.prose .nested-outline li { overflow-wrap: anywhere; }
.prose .nested-outline code { font: 500 .9em/1.5 var(--sans); }
.prose .index-example {
  margin: 28px 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper-deep);
  scroll-margin-top: calc(var(--header-height) + 24px);
}
.prose .index-example .index-file { display: block; color: var(--ink-soft); font: 400 13px/1.6 var(--sans); overflow-wrap: anywhere; }
.prose .index-example h3 { margin: 8px 0 20px; font: 600 23px/1.3 var(--sans); letter-spacing: -.02em; }
.prose .index-example .index-entries { margin: 0; padding: 0; list-style: none; }
.prose .index-example .index-entries li { margin: 0; padding: 16px 0; border-top: 1px solid var(--line); }
.prose .index-entry-head { display: flex; flex-direction: column; gap: 3px; }
.prose .index-entry-head > a, .prose .index-entry-head > strong { font-weight: 600; font-size: 17px; line-height: 1.5; }
.prose .index-entry-path { font: 400 13px/1.6 var(--sans); color: var(--ink-soft); overflow-wrap: anywhere; }
.prose .index-example .index-entries p { margin: 8px 0 0; font: 400 16px/1.7 var(--sans); }
.prose .index-source { margin-top: 8px; border-top: 1px solid var(--line); }
.prose .index-source summary { min-height: 44px; padding: 14px 0; font: 400 14px/1.5 var(--sans); color: var(--ink-soft); cursor: pointer; }
.prose .index-source pre.source-example { margin: 0 0 12px; padding: 14px; background: var(--paper); font-size: 13px; }
.prose .index-example :focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }
.article-meta, .card-meta, .note-row time, .note-time,
.context-table td, .case-snapshot dd { font-variant-numeric: tabular-nums; }
#epistemic-incident { --ei-serif: var(--sans); --ei-mono: var(--mono); }
#epistemic-incident .ei-notebook-head h2 { font-weight: 500; }

@media (max-width: 760px) {
  :root { --reading-size: 18px; }
  .hero-copy h1 { font-size: clamp(42px, 9.5vw, 58px); line-height: 1.07; letter-spacing: -.025em; }
  .hero-copy p { font-size: 17px; }
  .card-copy h3 { font-size: 26px; }
  .callout-copy blockquote { font-size: 33px; }
  .idea-preview p, .ideas-list article p { font-size: 27px; }
  [data-typography='writing'] .page-intro h1,
  [data-typography='ideas'] .page-intro h1 { font-size: 58px; }
  [data-typography='about'] .about-grid h1 { font-size: clamp(38px, 8vw, 51px); }
  .about-copy p { font-size: 18px; }
  .about-copy blockquote { font-size: 24px; }
  .article-header h1, .principle-article .article-header h1,
  .technical-article .article-header h1, .article-epistemics .article-header h1 {
    font-size: clamp(34px, 7.4vw, 46px); line-height: 1.15;
  }
  [data-typography='principle'] .article-header h1 { font-size: clamp(40px, 8.7vw, 53px); }
  .article-deck, .principle-article .article-deck { font-size: 17px; }
  .prose h2, .series-body .prose h2 { font-size: 26px; }
  .prose h3 { font-size: 22px; }
  .prose blockquote, .series-body .prose blockquote { font-size: 24px; padding-left: 20px; }
  [data-typography='note'], [data-typography='utility'] { --reading-size: 17px; }
  .series-map-card { min-height: 0; }
  .prose pre, .prose pre code, .case-story pre, .case-story pre code { font-size: 11px; }
}

/* Format labels share one chronological writing list. */
.recent-meta { display: flex; flex-direction: column; gap: 7px; }
.publication-kind { font: 400 11px/1.4 var(--sans); color: var(--ink-faint); letter-spacing: 0; text-transform: none; }
@media (max-width: 760px) { .publication-kind { font-size: 10px; } }