:root {
  --paper: #fdf9f3;
  --ink: #141414;
  --muted: #5c564e;
  --line: #e8e1d4;
  --gold: #6b4f24;
  --link: #4a3414;
  --card: #fffdf8;
  --serif: Georgia, "Iowan Old Style", Palatino, serif;
  --sans: "Segoe UI", system-ui, sans-serif;
  --max: 44rem;
}

*,
*::before,
*::after { 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 { color: var(--link); }
a:hover { color: var(--ink); }

img { max-width: 100%; height: auto; }

figure { margin: 0; }
figcaption {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.55rem;
}

.crumbs {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0 0 1rem;
}
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--ink); }

.table-wrap { overflow-x: auto; max-width: 100%; }

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 1rem;
  z-index: 10;
}
.skip:focus { left: 0.5rem; top: 0.5rem; }

.wrap {
  width: min(68rem, calc(100% - 2rem));
  margin: 0 auto;
}

header.site,
footer.site {
  padding: 1rem 0;
}

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 650;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.8rem;
}

nav.site { display: flex; flex-wrap: wrap; gap: 0.85rem 1.1rem; }
nav.site a { text-decoration: none; color: var(--muted); font-size: 0.95rem; }
nav.site a[aria-current="page"] { color: var(--ink); font-weight: 600; }

main { padding: 2.5rem 0 4rem; }

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

h1 { font-size: clamp(1.85rem, 4vw, 2.75rem); margin: 0 0 1rem; }
h2 { font-size: 1.45rem; margin: 2.25rem 0 0.7rem; }
h3 { font-size: 1.15rem; margin: 1.4rem 0 0.45rem; }
h2[id], h3[id] { scroll-margin-top: 0.85rem; }

p, li { color: var(--ink); }
.lede, .muted, time { color: var(--muted); }
.lede { font-size: 1.15rem; max-width: var(--max); }

.content { max-width: var(--max); }

.hero {
  display: grid;
  gap: 2rem;
  align-items: start;
  margin-bottom: 2.5rem;
}

@media (min-width: 860px) {
  .hero { grid-template-columns: 1.1fr 0.9fr; }
}

.hero img {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--card);
}

.actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin: 1.25rem 0 0; }

.btn {
  display: inline-block;
  padding: 0.7rem 1.05rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  min-height: 44px;
}
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { color: var(--paper); opacity: 0.92; }
.btn-ghost { border: 1px solid var(--line); color: var(--ink); background: var(--card); }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  margin: 1rem 0 1.5rem;
}
th, td {
  text-align: left;
  padding: 0.65rem 0.5rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th { font-weight: 650; }
caption {
  text-align: left;
  caption-side: top;
  font-weight: 650;
  padding: 0 0 0.55rem;
}

.note,
.toc,
.example,
.related,
.takeaways {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  max-width: var(--max);
}

.toc { margin: 1.25rem 0 1.75rem; }
.toc h2 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-family: var(--sans);
  letter-spacing: 0;
}
.toc ol { margin: 0; padding-left: 1.2rem; }
.toc li { margin: 0.28rem 0; color: var(--muted); }
.toc a { text-decoration: none; }

.example { margin: 1rem 0 1.5rem; }
.example h3 { margin-top: 0; }
.example p:last-child { margin-bottom: 0; }

.split {
  display: grid;
  gap: 1rem 1.5rem;
  margin: 1rem 0 1.5rem;
  max-width: var(--max);
}
@media (min-width: 640px) {
  .split { grid-template-columns: 1fr 1fr; }
}
.split h3 { margin-top: 0; }
.split ul { margin: 0; padding-left: 1.15rem; }

.related { margin: 2rem 0 0; }
.related h2 { margin-top: 0; }
.related ul { margin: 0; padding-left: 1.15rem; }

.takeaways { margin: 0 0 1.75rem; }
.takeaways h2 {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  font-family: var(--sans);
  letter-spacing: 0;
}
.takeaways ul { margin: 0; padding-left: 1.15rem; }
.takeaways li { margin: 0.35rem 0; }

.author {
  margin: 2.25rem 0 0;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  max-width: var(--max);
}
.author h2 { margin-top: 0; font-size: 1.15rem; }

dl.defs { margin: 1rem 0 1.5rem; max-width: var(--max); }
dl.defs dt { font-weight: 650; margin-top: 0.9rem; }
dl.defs dt:first-child { margin-top: 0; }
dl.defs dd { margin: 0.3rem 0 0; }

.check { margin: 0.5rem 0 1.25rem; padding-left: 1.15rem; }
.check li { margin: 0.45rem 0; }

.content figure img,
main > figure img {
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--card);
}

ol.steps { padding-left: 1.2rem; }
ol.steps li { margin: 0.55rem 0; }

footer.site {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

footer.site nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  margin-bottom: 0.85rem;
}
footer.site nav a {
  color: var(--muted);
  text-decoration: none;
}
footer.site nav a:hover { color: var(--ink); }
footer.site a { color: var(--muted); }

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}