:root {
  --bg: #fdfdfc;
  --fg: #1c1c1b;
  --muted: #555;
  --accent: #0a4a6e;
  --accent-soft: #d6e6ee;
  --border: #d8d6d2;
  --table-row: #f5f3ef;
  --code-bg: #f0eee9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --fg: #e8e6e3;
    --muted: #a8a6a2;
    --accent: #5aa6cf;
    --accent-soft: #1e3848;
    --border: #2c2e32;
    --table-row: #1c1e22;
    --code-bg: #20232a;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: Charter, "Bitstream Charter", "Source Serif Pro", Georgia, serif;
  font-size: 17px;
  line-height: 1.55;
  margin: 0;
  padding: 0;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 1.25rem 6rem;
}

header.title {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.5rem;
  margin-bottom: 2.5rem;
}

header.title h1 {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.85rem;
  line-height: 1.25;
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}

header.title .subtitle {
  color: var(--muted);
  margin: 0 0 1rem;
}

header.title .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.85rem;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
  font-weight: 600;
}

.badge.neutral {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

h2 {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.25rem;
  margin: 2.5rem 0 0.75rem;
  letter-spacing: -0.005em;
}

h3 {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.05rem;
  margin: 1.5rem 0 0.5rem;
  color: var(--muted);
}

p { margin: 0.5rem 0 1rem; }

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover { text-decoration: none; }

ul.tldr {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

ul.tldr li {
  padding: 0.5rem 0 0.5rem 1.5rem;
  position: relative;
  border-bottom: 1px dashed var(--border);
}

ul.tldr li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

ul.tldr li:last-child { border-bottom: none; }

figure {
  margin: 1.5rem 0;
}

figure img,
figure object {
  max-width: 100%;
  height: auto;
  display: block;
}

figcaption {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.5rem;
  text-align: center;
}

.scroll-wrap {
  overflow-x: auto;
  margin: 1rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.9rem;
}

table th, table td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

table th {
  font-weight: 600;
  border-bottom: 2px solid var(--fg);
  background: var(--bg);
}

table tbody tr:nth-child(even) {
  background: var(--table-row);
}

table td.num, table th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.callout {
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1rem;
  background: var(--accent-soft);
  color: var(--fg);
  margin: 1.5rem 0;
  border-radius: 0 4px 4px 0;
}

.callout strong { color: var(--accent); }

.links-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.links-list li {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}

.links-list .label {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  display: inline-block;
  min-width: 12rem;
  color: var(--muted);
  font-size: 0.9rem;
}

footer.foot {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

code {
  background: var(--code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.85em;
}

.diagram-row {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 700px) {
  .diagram-row.two-up {
    grid-template-columns: 1fr 1fr;
  }
}