:root {
  color-scheme: light;
  --paper: #f3efe6;
  --ink: #1c1915;
  --muted: #3e3932;
  --faint: #6a6258;
  --line: #d2c9ba;
  --code: #e8e1d3;
  --serif: "Iowan Old Style", Palatino, "Palatino Linotype", "Book Antiqua", "Songti SC", "Noto Serif SC", Georgia, serif;
  --sans: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", "Segoe UI", "Helvetica Neue", sans-serif;
  --mono: "SFMono-Regular", ui-monospace, "Cascadia Mono", "Sarasa Mono SC", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
}

a:link,
a:visited { color: var(--ink); }

a:hover { color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  padding: 0.4rem 0.7rem;
  background: var(--paper);
  border: 1px solid var(--ink);
  transform: translateY(-150%);
}

.skip:focus { transform: none; }

.frame {
  width: min(58rem, calc(100% - 2.5rem));
  margin: 0 auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.5rem;
  padding: 1.25rem 0 1rem;
  border-top: 8px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
}

.wordmark img {
  width: 1.7rem;
  height: 1.7rem;
  display: block;
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  font-size: 0.92rem;
}

.site-header nav a { text-underline-offset: 0.18em; }

.hero { padding: 2.75rem 0 0; }

.kicker {
  margin: 0 0 0.9rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.7rem, 7vw, 4.6rem);
  line-height: 0.96;
  letter-spacing: -0.02em;
}

.deck {
  max-width: 36rem;
  margin: 1.25rem 0 0;
  font-family: var(--serif);
  font-size: 1.35rem;
  line-height: 1.45;
}

.scope {
  max-width: 36rem;
  margin: 0.9rem 0 0;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.actions a {
  display: inline-block;
  padding: 0.55rem 0.9rem;
  text-decoration: none;
  border: 1px solid var(--ink);
}

.actions a.primary {
  background: var(--ink);
  color: var(--paper);
}

.actions a.primary:visited { color: var(--paper); }

.poster {
  margin: 2.25rem 0 0;
}

.poster img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ink);
}

main { padding-bottom: 1rem; }

section { padding: 2.4rem 0 0; }

h2 {
  margin: 0 0 0.8rem;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.85rem;
  line-height: 1.15;
}

h3 {
  margin: 1.6rem 0 0.45rem;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.25rem;
}

.measure { max-width: 40rem; }

ul, ol { padding-left: 1.2rem; }

li + li { margin-top: 0.35rem; }

p { margin: 0.7rem 0; }

pre {
  max-width: 100%;
  overflow-x: auto;
  margin: 1rem 0;
  padding: 0.9rem 1rem;
  background: var(--code);
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.5;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
}

p code,
li code,
td code {
  background: var(--code);
  padding: 0.05em 0.28em;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.2rem;
  font-size: 0.98rem;
}

th, td {
  text-align: left;
  vertical-align: top;
  padding: 0.55rem 0.7rem 0.55rem 0;
  border-bottom: 1px solid var(--line);
}

th {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
}

.site-footer {
  margin-top: 3rem;
  padding: 1.4rem 0 2.5rem;
  border-top: 1px solid var(--ink);
  display: grid;
  gap: 1.25rem;
}

.site-footer h2 {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
}

.site-footer ul { list-style: none; padding: 0; margin: 0.4rem 0 0; }

.site-footer li + li { margin-top: 0.2rem; }

.cols {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 1.5rem;
}

.fine {
  margin: 0;
  color: var(--faint);
  font-size: 0.92rem;
}

.toc {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  border-top: 1px solid var(--line);
}

.toc li {
  margin: 0;
  border-bottom: 1px solid var(--line);
}

.toc a {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  text-decoration: none;
}

.toc a span { color: var(--faint); font-variant-numeric: tabular-nums; }

@media (max-width: 720px) {
  .site-header { flex-direction: column; align-items: flex-start; }
  .cols { grid-template-columns: 1fr; }
  .frame { width: min(58rem, calc(100% - 1.5rem)); }
}

@media print {
  .skip, .actions, .site-header nav { display: none; }
  body { background: #fff; }
  pre { white-space: pre-wrap; }
}