:root {
  --font-body: "Spectral", Georgia, serif;
  --font-mono: "Sometype Mono", ui-monospace, "SF Mono", Menlo, Consolas, "DejaVu Sans Mono", monospace;
  --measure: 90ch;
  --gutter: 16px;
  --color-text: #222;
  --color-heading: #111;
  --color-muted: #6b6b6b;
  /* Lightest gray that still passes WCAG AA for small text on white. */
  --color-faint: #767676;
  --color-link: #2b4a6b;
  --color-link-underline: #c8c8c8;
  --color-code-bg: #f8f8f8;
  --color-code-border: #e6e6e6;
  --color-border: #e2e2de;
  --color-rule: #333;
}

body {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--gutter);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.4;
  color: var(--color-text);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-heading);
}

/* Links: muted accent with a light underline that darkens on hover. */
a {
  color: var(--color-link);
  text-decoration-color: var(--color-link-underline);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-color: currentColor;
}

/* Code blocks scroll horizontally instead of overflowing the column. */
pre {
  overflow-x: auto;
  padding: 0.75em 1em;
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: 4px;
  font-size: 0.875em;
  line-height: 1.2;
}

/* Set on code too, since browsers give code its own default monospace. */
pre,
code {
  font-family: var(--font-mono);
}

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

/* Wide tables scroll horizontally instead of overflowing the column. */
table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 0.9em;
  font-variant-numeric: tabular-nums;
}

th,
td {
  padding: 0.35em 0.75em;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

/* Booktabs style: strong rules at the top and bottom, lighter under the header.
   Borders go on cells since the block-level table would draw them full width. */
th {
  font-weight: 700;
  border-top: 1.5px solid var(--color-rule);
  border-bottom-color: var(--color-muted);
}

/* Tables without a header row still get the top rule. */
table:not(:has(thead)) tbody:first-of-type tr:first-child td {
  border-top: 1.5px solid var(--color-rule);
}

tbody:last-child tr:last-child td {
  border-bottom: 1.5px solid var(--color-rule);
}

/* Org tags each cell with its column's alignment. */
.org-left { text-align: left; }
.org-right { text-align: right; }
.org-center { text-align: center; }

/* Post list: title on the left, date on the right. Wraps on narrow screens. */
p:has(> .post-date) {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  column-gap: 1em;
  margin: 0.5em 0;
}

/* The page is all links, so titles only underline on hover. */
p:has(> .post-date) a {
  text-decoration: none;
}

p:has(> .post-date) a:hover {
  text-decoration: underline;
  text-decoration-color: currentColor;
}

.post-date {
  color: var(--color-faint);
  font-family: var(--font-mono);
  font-size: 0.8em;
  white-space: nowrap;
}

/* Homepage sections read as quiet labels so the post titles lead. */
.outline-2:has(.post-date) > h2 {
  margin: 2em 0 0.5em;
  color: var(--color-muted);
  font-size: 0.8em;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.outline-3:has(.post-date) > h3 {
  margin: 1.25em 0 0.25em;
  color: var(--color-muted);
  font-size: 1em;
  font-weight: 400;
  font-style: italic;
}

/* Header: site name on the left, links on the right. */
.navbar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5em 1.25em;
  padding: 1em 0 0.75em;
  margin-bottom: 2em;
  border-bottom: 1px solid var(--color-border);
}

.navbar a {
  color: inherit;
  text-decoration: none;
}

.navbar a:hover {
  text-decoration: underline;
}

.navbar a:first-of-type {
  margin-right: auto;
  font-weight: 700;
}

/* Figures: centered, with a smaller muted caption underneath. */
.figure {
  margin: 2em 0;
  text-align: center;
}

.figure p {
  margin: 0.5em 0;
}

.figure p + p {
  color: var(--color-muted);
  font-size: 0.875em;
}

/* Posts set some figures to 33% or 50% wide, which is unreadable on phones.
   min-width wins over the inline width without needing !important. */
@media (max-width: 600px) {
  .figure img {
    min-width: 80%;
  }
}

/* Footer: a thin rule matching the header, then one small muted line. */
#postamble {
  margin-top: 3em;
  padding: 0.75em 0 2em;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.875em;
}

#postamble p {
  margin: 0;
}