:root {
  --bg: #faf8f4;
  --fg: #191a1e;
  --muted: #5c6270;
  --line: #e4dfd4;
  --card: #ffffff;
  --accent: #0f6b5c;
  --accent-soft: #f1f7f5;
  --diag-line: #a9a397;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #ecedef;
    --muted: #9aa0ad;
    --line: #2a2d34;
    --card: #1a1d22;
    --accent: #5fd0b6;
    --accent-soft: #1c2a27;
    --diag-line: #4a4f59;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 84px 24px 40px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* hero */
.hero { margin-bottom: 72px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 20px;
}

h1 {
  font-size: 2.6rem;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
}

.lede {
  font-size: 1.08rem;
  color: var(--muted);
  max-width: 62ch;
  margin: 0 0 28px;
}

.links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  padding: 0;
  margin: 0;
  font-size: 0.92rem;
}

/* sections */
section { margin-bottom: 72px; }

h2 {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.count { color: var(--line); }

/* featured */
.feature {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 32px;
}

.feature-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.feature-head h3 {
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  margin: 0;
}

.tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 10px;
  margin: 0;
}

.feature-lede {
  color: var(--muted);
  max-width: 66ch;
  margin: 0 0 28px;
}

/* diagram */
.diagram { margin: 0 0 32px; }

.diagram-scroll { overflow-x: auto; }

.diagram svg {
  display: block;
  width: 100%;
  min-width: 660px;
  height: auto;
}

.diagram .box rect {
  fill: var(--bg);
  stroke: var(--line);
  stroke-width: 1.2;
}

.diagram .box.accent rect {
  fill: var(--accent-soft);
  stroke: var(--accent);
}

.diagram .t1 {
  font-size: 14px;
  font-weight: 600;
  fill: var(--fg);
  text-anchor: middle;
}

.diagram .t2 {
  font-size: 11px;
  fill: var(--muted);
  text-anchor: middle;
}

.diagram .t3 {
  font-size: 11px;
  fill: var(--muted);
  text-anchor: middle;
}

.diagram .flow {
  stroke: var(--diag-line);
  stroke-width: 1.5;
  marker-end: url(#arw);
}

.diagram .feedback {
  fill: none;
  stroke: var(--diag-line);
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
  marker-end: url(#arw);
}

.diagram figcaption {
  color: var(--muted);
  font-size: 0.82rem;
  margin-top: 14px;
}

/* capability + background lists */
.caps, .facts {
  list-style: none;
  padding: 0;
  margin: 0;
}

.caps li, .facts li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 0.94rem;
  max-width: 74ch;
}

.caps li::before, .facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 1px;
  background: var(--accent);
}

.caps strong, .facts strong { color: var(--fg); font-weight: 600; }

/* github grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.card h3 { margin: 0 0 8px; font-size: 1rem; letter-spacing: -0.01em; }
.card h3 a { color: var(--fg); }
.card h3 a:hover { color: var(--accent); }

.card p {
  color: var(--muted);
  font-size: 0.88rem;
  margin: 0 0 16px;
  flex: 1;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.lang { color: var(--accent); }

/* footer */
footer {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  color: var(--muted);
  font-size: 0.85rem;
}

.built {
  font-family: var(--mono);
  font-size: 0.7rem;
  margin: 18px 0 0;
}

@media (max-width: 620px) {
  main { padding-top: 56px; }
  h1 { font-size: 2rem; }
  .feature { padding: 22px; }
}