/* Lattice — calm utility aesthetic.
 * No frameworks, no tracking, no fonts that phone home.
 * Mobile-first. Light/dark via prefers-color-scheme.
 * Total file weight target: under 8 KB.
 */

:root {
  --ink: #0E1116;
  --ink-soft: #1A1F26;
  --bone: #F5F1E8;
  --bone-soft: #F8F4EB;
  --rule: #D8D2C0;
  --accent: #3A7D44;
  --accent-soft: #4F9758;
  --warning: #C77D3A;
  --danger: #B8442E;
  --max-width: 720px;
  --max-width-wide: 880px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #F5F1E8;
    --ink-soft: #D8D2C0;
    --bone: #0E1116;
    --bone-soft: #1A1F26;
    --rule: #2C3138;
    --accent: #6FAA75;
    --accent-soft: #4F9758;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bone);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

main, footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

main.wide {
  max-width: var(--max-width-wide);
}

header {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 24px 24px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--rule);
}

header a.brand {
  font-weight: 700;
  font-size: 28px;
  letter-spacing: -0.5px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 0 0 auto;
}

header a.brand img {
  width: 56px;
  height: 56px;
  border-radius: 12px;
}

header nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 15px;
  justify-content: flex-end;
}

header nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

header nav a:hover, header nav a.active {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

main {
  padding-top: 32px;
  padding-bottom: 80px;
}

h1 {
  font-size: 32px;
  line-height: 1.2;
  margin: 8px 0 24px 0;
  font-weight: 600;
}

h2 {
  font-size: 22px;
  line-height: 1.3;
  margin: 40px 0 12px 0;
  font-weight: 600;
}

h3 {
  font-size: 18px;
  margin: 28px 0 8px 0;
  font-weight: 600;
}

p {
  margin: 0 0 16px 0;
}

p.lead {
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink-soft);
}

p.read-time {
  color: var(--ink-soft);
  font-size: 14px;
  margin-bottom: 28px;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent-soft);
}

hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 40px 0;
}

ul, ol {
  padding-left: 24px;
}

li {
  margin-bottom: 8px;
}

.pillrow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0;
}

.pill {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-size: 13px;
  color: var(--ink-soft);
}

.button-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin: 28px 0 8px 0;
}

a.button {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  border: 1px solid var(--rule);
}

a.button.primary {
  background: var(--accent);
  color: var(--bone);
  border-color: var(--accent);
}

a.button.primary:hover {
  background: var(--accent-soft);
  color: var(--bone);
}

a.button.secondary {
  background: transparent;
  color: var(--ink);
}

a.button.secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px 0;
  font-size: 15px;
}

th, td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

th {
  font-weight: 600;
  background: var(--bone-soft);
}

td.yes {
  color: var(--accent);
  font-weight: 600;
}

td.no {
  color: var(--ink-soft);
}

td.partial {
  color: var(--warning);
}

pre, code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
}

pre {
  padding: 16px;
  background: var(--bone-soft);
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.4;
}

pre.diagram {
  font-size: 13px;
  line-height: 1.35;
  color: var(--ink);
  white-space: pre;
}

code:not(pre code) {
  background: var(--bone-soft);
  border: 1px solid var(--rule);
  padding: 1px 6px;
  border-radius: 4px;
}

blockquote {
  margin: 24px 0;
  padding: 8px 16px;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
  font-style: italic;
}

.box {
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 16px 0;
  background: var(--bone-soft);
}

.box.warn {
  border-color: var(--warning);
}

.box h3 {
  margin-top: 4px;
}

footer {
  font-size: 14px;
  color: var(--ink-soft);
  border-top: 1px solid var(--rule);
  padding-top: 24px;
  padding-bottom: 32px;
}

footer .columns {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 16px;
}

footer .columns div {
  flex: 1;
  min-width: 140px;
}

footer .columns h4 {
  font-size: 14px;
  margin: 0 0 8px 0;
  color: var(--ink);
}

footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

footer li {
  margin-bottom: 4px;
}

footer a {
  color: var(--ink-soft);
}

footer a:hover {
  color: var(--accent);
}

@media (max-width: 540px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  h1 {
    font-size: 26px;
  }
  pre.diagram {
    font-size: 11px;
  }
}