:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --ink: #172033;
  --muted: #667085;
  --line: rgba(23, 32, 51, 0.14);
  --surface: #ffffff;
  --accent: #0f766e;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(260px, 330px) minmax(0, 1fr);
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, "SF Pro Text", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.58;
}
aside {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 22px 18px;
  border-right: 1px solid var(--line);
  background: #eef2f1;
}
.home {
  display: block;
  margin: 0 0 18px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}
.nav-group { margin: 18px 0; }
.nav-title {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.nav-link {
  display: block;
  padding: 7px 8px;
  border-radius: 6px;
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
}
.nav-link:hover { background: var(--surface); }
main {
  min-width: 0;
  padding: 40px min(6vw, 72px) 72px;
}
.hero {
  max-width: 980px;
  margin-bottom: 30px;
}
.eyebrow {
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
h1 {
  margin: 8px 0 10px;
  font-size: clamp(34px, 5vw, 66px);
  line-height: 1.04;
  letter-spacing: 0;
}
h2, h3, h4 { line-height: 1.2; letter-spacing: 0; }
.sub {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}
.card, .doc {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 14px 34px -30px rgba(23, 32, 51, 0.5);
}
.card {
  padding: 18px;
}
.card a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 750;
}
.path {
  margin-top: 8px;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  overflow-wrap: anywhere;
}
.doc {
  padding: clamp(22px, 4vw, 52px);
}
.source-meta {
  margin-bottom: 24px;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
}
th, td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  vertical-align: top;
}
th {
  background: #edf5f2;
  text-align: left;
}
pre {
  overflow: auto;
  padding: 16px;
  border-radius: 8px;
  background: #111827;
  color: #f9fafb;
}
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}
p code, li code, td code {
  padding: 0.1em 0.3em;
  border-radius: 4px;
  background: #edf2f7;
  color: var(--ink);
}
.slide-break {
  margin: 34px 0;
  border: 0;
  border-top: 3px double var(--line);
}
details {
  margin-top: 28px;
}
summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 750;
}
iframe.diagram {
  width: 100%;
  min-height: 760px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
@media (max-width: 820px) {
  body { grid-template-columns: 1fr; }
  aside {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  main { padding: 24px 16px 48px; }
}