/* graphgram documentation site.
 *
 * One stylesheet, no build step, no framework. The site is committed as
 * static HTML (GitHub Pages serves master:/docs), so everything here has to
 * work from a plain <link> with no preprocessing.
 *
 * Colours are defined once on :root as the light palette and overridden in a
 * single prefers-color-scheme block, so no colour is ever declared only
 * inside a media query. */

:root {
  --bg:        #fbfaf7;
  --bg-raised: #ffffff;
  --bg-sunk:   #f2efe9;
  --fg:        #1e1b16;
  --fg-muted:  #5f594e;
  --fg-faint:  #8b8375;
  --rule:      #e2ddd2;
  --accent:    #8a4b2a;
  --accent-bg: #f6ece3;
  --link:      #7a3d1f;
  --code-bg:   #f4f1ea;
  --shadow:    0 1px 2px rgba(30, 27, 22, .06), 0 4px 12px rgba(30, 27, 22, .05);
  --mono: ui-monospace, "SF Mono", "Menlo", "Consolas", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #16151a;
    --bg-raised: #1e1d23;
    --bg-sunk:   #121116;
    --fg:        #e8e4db;
    --fg-muted:  #a8a396;
    --fg-faint:  #7b7668;
    --rule:      #2f2d36;
    --accent:    #d99a6c;
    --accent-bg: #2a2119;
    --link:      #e0a878;
    --code-bg:   #1b1a20;
    --shadow:    0 1px 2px rgba(0, 0, 0, .3), 0 4px 14px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

/* --- navigation -------------------------------------------------------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-nav nav {
  max-width: 60rem;
  margin: 0 auto;
  padding: .6rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .25rem 1.1rem;
}
.site-nav a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: .9rem;
  letter-spacing: .01em;
  white-space: nowrap;
}
.site-nav a:hover { color: var(--fg); }
.site-nav a.active { color: var(--accent); }
.site-nav a.brand {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--fg);
  margin-right: auto;
}

/* --- prose ------------------------------------------------------------- */

.prose {
  max-width: 46rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.prose h1 {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 1.3rem + 2.2vw, 2.7rem);
  line-height: 1.15;
  letter-spacing: -.015em;
  margin: 0 0 1.2rem;
  font-weight: 600;
}
.prose h2 {
  font-family: var(--serif);
  font-size: 1.45rem;
  line-height: 1.25;
  margin: 2.8rem 0 .8rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
  font-weight: 600;
}
.prose h3 {
  font-size: 1.08rem;
  margin: 2rem 0 .5rem;
  font-weight: 650;
  letter-spacing: .005em;
}
.prose h4 { font-size: .98rem; margin: 1.5rem 0 .4rem; color: var(--fg-muted); }

.prose p { margin: 0 0 1.05rem; }
.prose > p:first-of-type em:only-child { color: var(--fg-muted); }

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

.prose ul, .prose ol { margin: 0 0 1.05rem; padding-left: 1.4rem; }
.prose li { margin: .3rem 0; }
.prose li > ul, .prose li > ol { margin-bottom: .2rem; }

.prose blockquote {
  margin: 1.2rem 0;
  padding: .1rem 0 .1rem 1.1rem;
  border-left: 3px solid var(--accent);
  color: var(--fg-muted);
}

.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 2.4rem 0; }

/* --- code -------------------------------------------------------------- */

.prose code {
  font-family: var(--mono);
  font-size: .87em;
  background: var(--code-bg);
  padding: .12em .34em;
  border-radius: 3px;
}
.prose pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: .9rem 1rem;
  overflow-x: auto;
  margin: 0 0 1.2rem;
  line-height: 1.5;
}
.prose pre code {
  background: none;
  padding: 0;
  font-size: .82rem;
}

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

/* Wide tables are common in the papers (taxonomies, comparisons). Let them
 * scroll inside their own box rather than pushing the page sideways. */
.prose table {
  display: block;
  overflow-x: auto;
  max-width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.3rem;
  font-size: .88rem;
}
.prose th, .prose td {
  border: 1px solid var(--rule);
  padding: .42rem .7rem;
  text-align: left;
  vertical-align: top;
}
.prose th { background: var(--bg-sunk); font-weight: 600; }
.prose tbody tr:nth-child(even) td { background: color-mix(in srgb, var(--bg-sunk) 45%, transparent); }

/* --- cards, used by the landing page and the example gallery ----------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2rem;
  padding: 0;
  list-style: none;
}
.card {
  background: var(--bg-raised);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
  margin: 0;
}
.card h3 { margin: 0 0 .35rem; font-size: 1rem; }
.card h3 a { text-decoration: none; }
.card p { margin: 0 0 .5rem; font-size: .9rem; color: var(--fg-muted); }
.card .meta {
  font-family: var(--mono);
  font-size: .74rem;
  color: var(--fg-faint);
  letter-spacing: .01em;
}

.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: .72rem;
  padding: .1rem .45rem;
  border-radius: 999px;
  background: var(--accent-bg);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  margin-right: .3rem;
}

.lede {
  font-size: 1.1rem;
  color: var(--fg-muted);
  margin-bottom: 1.8rem;
}

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

.site-foot {
  border-top: 1px solid var(--rule);
  padding: 1.4rem 1.25rem 3rem;
  text-align: center;
}
.site-foot p { margin: 0; font-size: .82rem; color: var(--fg-faint); }
.site-foot a { color: var(--fg-muted); }

@media (max-width: 40rem) {
  .prose { padding: 1.8rem 1rem 3rem; }
  .site-nav nav { padding: .5rem 1rem; gap: .2rem .8rem; }
}