/* Public blog. Shares the reader's design system: paper and rust in light,
   Tokyo Night in dark, Literata for reading and Libre Franklin for apparatus.
   Mobile-first. No framework, no build step beyond the copy into public/. */

:root {
  --paper: oklch(0.975 0.008 85);
  --paper-2: oklch(0.955 0.010 85);
  --paper-3: oklch(0.925 0.012 85);
  --ink: oklch(0.24 0.012 60);
  --ink-2: oklch(0.42 0.012 60);
  --ink-3: oklch(0.60 0.010 60);
  --rule: oklch(0.86 0.010 80);
  --accent: oklch(0.50 0.16 32);
  --accent-ink: oklch(0.42 0.15 32);
  --accent-wash: oklch(0.94 0.035 40);

  --font-read: "Literata", Georgia, "Iowan Old Style", "Times New Roman", serif;
  --font-ui: "Libre Franklin", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-code: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --measure: 40rem;
  --wide: 52rem;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 150ms;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #1a1b26;
    --paper-2: #16161e;
    --paper-3: #24283b;
    --ink: #c0caf5;
    --ink-2: #a9b1d6;
    --ink-3: #737aa2;
    --rule: #2f3549;
    --accent: #7aa2f7;
    --accent-ink: #7dcfff;
    --accent-wash: #283457;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #1a1b26;
  --paper-2: #16161e;
  --paper-3: #24283b;
  --ink: #c0caf5;
  --ink-2: #a9b1d6;
  --ink-3: #737aa2;
  --rule: #2f3549;
  --accent: #7aa2f7;
  --accent-ink: #7dcfff;
  --accent-wash: #283457;
  color-scheme: dark;
}

@media (prefers-reduced-motion: reduce) { :root { --dur: 0ms; } }

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-read);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-kerning: normal;
  font-optical-sizing: auto;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-ink); }
::selection { background: var(--accent-wash); color: var(--ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
img { max-width: 100%; height: auto; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 20;
  background: var(--paper-2); color: var(--ink);
  padding: 0.6rem 1rem; font-family: var(--font-ui); border: 1px solid var(--rule);
}
.skip:focus { left: 0.5rem; top: 0.5rem; }

/* ---------- masthead ---------- */
.masthead {
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-ui);
}
.masthead-title {
  font-weight: 600; font-size: 0.95rem; letter-spacing: 0.01em;
  color: var(--ink); margin-right: auto;
}
.masthead-title:hover { color: var(--accent); }
.masthead-nav { display: flex; align-items: center; gap: 1.1rem; font-size: 0.85rem; }
.masthead-nav a { color: var(--ink-2); }
.masthead-nav a:hover { color: var(--accent); }
.theme-btn {
  display: inline-flex; align-items: center; justify-content: center;
  background: none; border: 0; padding: 0.25rem; cursor: pointer;
  color: var(--ink-3); border-radius: 4px;
}
.theme-btn:hover { color: var(--accent); }

main { flex: 1 0 auto; width: 100%; max-width: var(--wide); margin: 0 auto; padding: 0 1.25rem; }

/* ---------- front page ---------- */
.hero { padding: 3rem 0 1.5rem; border-bottom: 1px solid var(--rule); }
.hero h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); line-height: 1.15; margin: 0 0 0.6rem; letter-spacing: -0.015em; }
.tagline { font-family: var(--font-ui); color: var(--ink-2); font-size: 1rem; margin: 0; max-width: var(--measure); }
.empty { font-family: var(--font-ui); color: var(--ink-3); padding: 2.5rem 0; }

.eyebrow {
  font-family: var(--font-ui); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.09em; color: var(--ink-3); margin: 0 0 0.75rem;
}
.latest { padding: 2.25rem 0; border-bottom: 1px solid var(--rule); }
.latest-link { display: block; color: inherit; }
.latest-link h2 {
  font-size: clamp(1.5rem, 4vw, 2rem); line-height: 1.2; margin: 0.35rem 0 0.6rem;
  letter-spacing: -0.01em; color: var(--ink);
}
.latest-link:hover h2 { color: var(--accent); }

.card-meta, .post-meta {
  font-family: var(--font-ui); font-size: 0.76rem; color: var(--ink-3);
  text-transform: uppercase; letter-spacing: 0.07em; margin: 0;
}
.track { color: var(--accent-ink); font-weight: 600; }
.dot { padding: 0 0.5em; opacity: 0.55; }
.card-summary { font-family: var(--font-ui); color: var(--ink-2); margin: 0; font-size: 0.95rem; max-width: var(--measure); }

.listing { padding: 2rem 0; }
.listing-head {
  font-family: var(--font-ui); font-size: 0.78rem; text-transform: uppercase;
  letter-spacing: 0.09em; color: var(--ink-3); font-weight: 600;
  margin: 0 0 1rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--rule);
}
.cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 1.75rem; }
.card-link { display: block; color: inherit; }
.card-title { font-size: 1.2rem; line-height: 1.3; margin: 0.3rem 0 0.4rem; color: var(--ink); }
.card-link:hover .card-title { color: var(--accent); }
.more { font-family: var(--font-ui); font-size: 0.9rem; margin: 1.75rem 0 0; }

/* ---------- article ---------- */
.post { padding: 2.5rem 0 1rem; }
.post-head { max-width: var(--measure); }
.post-head h1 {
  font-size: clamp(1.8rem, 5vw, 2.5rem); line-height: 1.15;
  margin: 0.5rem 0 0.75rem; letter-spacing: -0.015em;
}
.deck {
  font-family: var(--font-ui); font-size: 1.075rem; line-height: 1.5;
  color: var(--ink-2); margin: 0 0 1.25rem;
}
.byline {
  font-family: var(--font-ui); font-size: 0.8rem; color: var(--ink-3);
  margin: 0; padding-bottom: 1.5rem; border-bottom: 1px solid var(--rule);
}
/* Present only when the article has been published on LinkedIn as well. */
.byline a.also {
  color: var(--ink-2); text-decoration: underline;
  text-decoration-color: var(--rule); text-underline-offset: 0.15em;
}
.byline a.also:hover { color: var(--accent); text-decoration-color: currentColor; }
@media (pointer: coarse) { .byline a.also { display: inline-block; padding: 0.6rem 0; } }

.toc {
  font-family: var(--font-ui); font-size: 0.875rem;
  margin: 1.75rem 0; padding: 1rem 1.25rem;
  background: var(--paper-2); border: 1px solid var(--rule); border-radius: 6px;
  max-width: var(--measure);
}
.toc-head {
  margin: 0 0 0.5rem; font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--ink-3);
}
.toc ol { margin: 0; padding-left: 1.1rem; }
.toc li { margin: 0.3rem 0; }
.toc a { color: var(--ink-2); }
.toc a:hover { color: var(--accent); }

.prose { max-width: var(--measure); }
.prose > * { margin-inline: 0; }
.prose p { margin: 0 0 1.35rem; }
.prose h2 {
  font-size: 1.45rem; line-height: 1.25; letter-spacing: -0.01em;
  margin: 2.75rem 0 0.9rem; scroll-margin-top: 1.5rem;
}
.prose h3 { font-size: 1.15rem; line-height: 1.3; margin: 2rem 0 0.7rem; scroll-margin-top: 1.5rem; }
.prose h4 { font-size: 1rem; font-family: var(--font-ui); margin: 1.6rem 0 0.5rem; }
.prose ul, .prose ol { margin: 0 0 1.35rem; padding-left: 1.35rem; }
.prose li { margin: 0.45rem 0; }
.prose li > ul, .prose li > ol { margin: 0.45rem 0 0; }
.prose strong { font-weight: 650; }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

.prose code {
  font-family: var(--font-code); font-size: 0.875em;
  background: var(--paper-3); padding: 0.12em 0.34em; border-radius: 3px;
}
.prose pre {
  background: var(--paper-2); border: 1px solid var(--rule); border-radius: 6px;
  padding: 1rem 1.1rem; overflow-x: auto; margin: 0 0 1.35rem;
  font-size: 0.875rem; line-height: 1.55;
}
.prose pre code { background: none; padding: 0; font-size: inherit; }

.prose blockquote {
  margin: 0 0 1.35rem; padding: 0.2rem 0 0.2rem 1.15rem;
  border-left: 3px solid var(--rule); color: var(--ink-2); font-style: italic;
}
.prose blockquote p:last-child { margin-bottom: 0; }

.callout {
  display: block; margin: 0 0 1.35rem; padding: 1rem 1.15rem;
  background: var(--paper-2); border: 1px solid var(--rule);
  border-left: 3px solid var(--accent); border-radius: 0 6px 6px 0;
  font-family: var(--font-ui); font-size: 0.95rem;
}
.callout p { margin: 0 0 0.7rem; }
.callout p:last-child { margin-bottom: 0; }
.callout-title {
  font-weight: 600; font-size: 0.78rem; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--accent-ink);
}
.callout ul, .callout ol { margin: 0.5rem 0 0; padding-left: 1.2rem; }

.note-ref { font-style: italic; color: var(--ink-2); }

.table-wrap { overflow-x: auto; margin: 0 0 1.35rem; }
.prose table {
  border-collapse: collapse; width: 100%;
  font-family: var(--font-ui); font-size: 0.9rem;
}
.prose th, .prose td {
  border-bottom: 1px solid var(--rule); padding: 0.6rem 0.8rem;
  text-align: left; vertical-align: top;
}
.prose th {
  font-weight: 600; font-size: 0.76rem; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--ink-3); border-bottom-color: var(--ink-3);
}
.prose tbody tr:last-child td { border-bottom: 0; }

/* ---------- apparatus ---------- */
.tags {
  list-style: none; display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin: 2.5rem 0 0; padding: 0; max-width: var(--measure);
}
.tags li {
  font-family: var(--font-ui); font-size: 0.74rem; color: var(--ink-3);
  border: 1px solid var(--rule); border-radius: 999px; padding: 0.2rem 0.65rem;
}
.apparatus {
  max-width: var(--measure); margin: 2.25rem 0 0;
  padding-top: 1.5rem; border-top: 1px solid var(--rule);
  font-family: var(--font-ui);
}
.apparatus h2 {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--ink-3); font-weight: 600; margin: 0 0 0.75rem;
}
.source-list { list-style: none; margin: 0; padding: 0; font-size: 0.9rem; color: var(--ink-2); }
.source-list li { padding: 0.25rem 0; }
/* The title is the work, so it carries the italic; the author beside it does not. */
.source-list cite { font-style: italic; }
.source-list a { color: inherit; text-decoration-color: var(--rule); }
.source-list a:hover { color: var(--ink-1); text-decoration-color: currentColor; }

.prevnext {
  display: grid; gap: 1rem; max-width: var(--measure);
  margin: 3rem 0 1rem; padding-top: 1.5rem; border-top: 1px solid var(--rule);
  font-family: var(--font-ui);
}
@media (min-width: 34rem) { .prevnext { grid-template-columns: 1fr 1fr; } }
.pn { font-size: 0.95rem; line-height: 1.35; color: var(--ink); }
.pn span {
  display: block; font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--ink-3); margin-bottom: 0.3rem;
}
.pn:hover { color: var(--accent); }
.pn.next { text-align: left; }
@media (min-width: 34rem) { .pn.next { text-align: right; } }

/* ---------- footer ---------- */
.site-foot {
  flex: 0 0 auto; margin-top: 3rem; padding: 2rem 1.25rem 3rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-ui); font-size: 0.82rem; color: var(--ink-3);
}
.site-foot p { margin: 0 auto; max-width: var(--wide); }
.foot-note { margin-top: 0.4rem; opacity: 0.85; }

@media (min-width: 48rem) {
  .masthead { padding: 1.25rem 2rem; }
  main { padding: 0 2rem; }
  .site-foot { padding: 2rem 2rem 3rem; }
  .cards { gap: 2rem; }
}