/* ---------------------------------------------------------------------------
   Ken Caldeira — content-first stylesheet.
   Tokens are defined once on :root for light, then overridden for dark, so
   every colour has a definition in both themes.
   --------------------------------------------------------------------------- */

:root {
  color-scheme: light dark;

  --bg:        #fdfdfc;
  --bg-soft:   #f3f2ee;
  --fg:        #1b1b1a;
  --fg-muted:  #5f5f5a;
  --fg-faint:  #85857e;
  --rule:      #e0dfd8;
  --link:      #1f5c8b;
  --link-hover:#12405f;
  --accent:    #8a5a2b;

  /* Inline text colours carried over from the source posts, where they mark
     quoted email and external material. Retuned for contrast, not copied. */
  --tc-blue:   #1f5c8b;
  --tc-navy:   #2b3d7a;
  --tc-maroon: #8a2f2f;
  --tc-gray:   #6b6b66;

  --measure: 40rem;
  --wide:    52rem;

  --font-body: ui-serif, Georgia, "Iowan Old Style", "Times New Roman", serif;
  --font-ui:   ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #14151a;
    --bg-soft:   #1d1f25;
    --fg:        #e6e5e0;
    --fg-muted:  #a8a7a0;
    --fg-faint:  #85847d;
    --rule:      #2e3038;
    --link:      #7fb6dd;
    --link-hover:#a8cff0;
    --accent:    #d8a66a;

    --tc-blue:   #7fb6dd;
    --tc-navy:   #9aa8e8;
    --tc-maroon: #e59a9a;
    --tc-gray:   #a8a7a0;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

.wrap {
  width: 100%;
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 10;
  padding: 0.5rem 0.75rem;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 4px;
}

a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--link-hover); }

/* --- header / footer ----------------------------------------------------- */

.site-header {
  border-bottom: 1px solid var(--rule);
  padding-block: 1.75rem 1.25rem;
  margin-bottom: 2.5rem;
}
.site-title {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 1.4rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}
.site-title a { color: var(--fg); text-decoration: none; }
.site-tagline {
  margin: 0.15rem 0 0;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--fg-muted);
}
.site-nav {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  font-family: var(--font-ui);
  font-size: 0.9rem;
}

.site-footer {
  margin-top: 4rem;
  padding-block: 1.5rem 2.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--fg-muted);
}
.site-footer p { margin: 0; }

/* --- archive index ------------------------------------------------------- */

.year { margin-bottom: 2.25rem; }
.year-heading {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin: 0 0 0.6rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--rule);
}
.post-list { list-style: none; margin: 0; padding: 0; }
.post-list li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  justify-content: space-between;
  padding-block: 0.4rem;
}
.post-list a { text-decoration: none; }
.post-list a:hover { text-decoration: underline; }
.post-list time {
  flex: none;
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--fg-faint);
  font-variant-numeric: tabular-nums;
}

/* --- post --------------------------------------------------------------- */

.post-header { margin-bottom: 2rem; }
.post-title {
  font-size: clamp(1.6rem, 1.2rem + 2vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 0.4rem;
}
.post-meta {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--fg-faint);
}

.post-body > * + * { margin-top: 1.15em; }
.post-body h2, .post-body h3, .post-body h4 {
  font-family: var(--font-ui);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-top: 2.2em;
  margin-bottom: 0.6em;
}
.post-body h2 { font-size: 1.35rem; }
.post-body h3 { font-size: 1.15rem; }
.post-body h4, .post-body h5, .post-body h6 { font-size: 1rem; }

.post-body hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin-block: 2.5rem;
}

.post-body ul, .post-body ol { padding-left: 1.4rem; }
.post-body li + li { margin-top: 0.35em; }

.post-body blockquote {
  margin-inline: 0;
  padding-left: 1rem;
  border-left: 3px solid var(--rule);
  color: var(--fg-muted);
}

/* Inline colours from the source posts, mapped to theme-aware tokens. */
.tc-blue   { color: var(--tc-blue); }
.tc-navy   { color: var(--tc-navy); }
.tc-maroon { color: var(--tc-maroon); }
.tc-gray   { color: var(--tc-gray); }
.tc-plain  { color: var(--fg); }

.text-center { text-align: center; }

.citation-title, .citation-authors {
  font-family: var(--font-ui);
  font-size: 0.95rem;
  margin-top: 0.3em !important;
}
.citation-authors { color: var(--fg-muted); font-size: 0.875rem; }

/* --- figures ------------------------------------------------------------ */

/* Figures and tables may exceed the text measure; they stay centred on it. */
.fig, .table-wrap, .gallery {
  margin-inline: auto;
  width: 100%;
  max-width: var(--wide);
}
@media (min-width: 54rem) {
  .fig, .table-wrap, .gallery {
    margin-inline: calc((var(--measure) - var(--wide)) / 2);
  }
}

.fig { margin-block: 2rem; }
.fig img {
  display: block;
  max-width: 100%;
  height: auto;
  margin-inline: auto;
  border-radius: 3px;
  background: var(--bg-soft);
}
.fig figcaption {
  margin-top: 0.6rem;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--fg-muted);
  text-align: center;
}

.post-body img { max-width: 100%; height: auto; }

.gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.gallery .fig { flex: 1 1 14rem; margin-block: 0; }

.video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  max-width: 100%;
  background: var(--bg-soft);
  border-radius: 3px;
  overflow: hidden;
}
.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* --- tables ------------------------------------------------------------- */

/* Wide tables scroll inside their own box rather than the page. */
.post-body table {
  display: block;
  overflow-x: auto;
  max-width: 100%;
  border-collapse: collapse;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  line-height: 1.4;
}
.post-body th, .post-body td {
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--rule);
  text-align: left;
}
.post-body thead th {
  border-bottom: 2px solid var(--rule);
  font-weight: 650;
  white-space: nowrap;
}
.post-body tbody tr:nth-child(even) { background: var(--bg-soft); }
.table-caption {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--fg-muted);
}

/* --- prev / next -------------------------------------------------------- */

.post-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-ui);
  font-size: 0.95rem;
}
.post-nav a {
  flex: 1 1 14rem;
  text-decoration: none;
  line-height: 1.35;
}
.post-nav a:hover { text-decoration: underline; }
.post-nav .next { text-align: right; }
.post-nav span {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 0.2rem;
}

@media (max-width: 30rem) {
  body { font-size: 1.0625rem; }
  .post-list li { flex-direction: column; gap: 0.1rem; }
}

/* Outbound nav links carry a small arrow so leaving the site is visible. */
.site-nav a.external::after {
  content: "\2197";
  margin-left: 0.15em;
  font-size: 0.85em;
  color: var(--fg-faint);
}

/* --- featured (latest) post on the landing page ------------------------- */

/* Deliberately restrained: the archive below is still the main event. The
   label reuses the .year-heading treatment so this reads as part of the
   existing system rather than a new component. */
.featured {
  margin-bottom: 2.5rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--rule);
}
.featured-label {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin: 0 0 0.5rem;
}
.featured-title {
  /* A step below .post-title, so it leads the page without competing with
     the site title in the header. */
  font-size: clamp(1.35rem, 1.1rem + 1.4vw, 1.8rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 0.35rem;
}
.featured-title a {
  color: var(--fg);
  text-decoration: none;
}
.featured-title a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}
.featured-meta {
  margin: 0 0 0.75rem;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--fg-faint);
}
.featured-excerpt {
  margin: 0;
  color: var(--fg-muted);
  max-width: var(--measure);
}