:root {
  --bg: #ebe6dc;
  --panel: #f7f4ef;
  --ink: #1c1917;
  --muted: #78716c;
  --line: #d6d0c4;
  --accent: #3f5d4a;
  --font: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", ui-monospace, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

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

header.site {
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

header.site .brand {
  font-weight: 650;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--ink);
}

header.site nav {
  display: flex;
  gap: 1rem;
  font-size: 0.9rem;
}

header.site nav a {
  text-decoration: none;
  font-weight: 500;
}

header.site nav a:hover,
header.site nav a[aria-current="page"] {
  text-decoration: underline;
}

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

h1 {
  font-size: clamp(1.6rem, 3vw, 2.05rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

h2 {
  font-size: 1.2rem;
  color: var(--accent);
  margin: 2.25rem 0 0.75rem;
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.02rem;
  margin: 1.35rem 0 0.4rem;
}

p,
li {
  font-size: 1rem;
}

.lede {
  font-size: 1.08rem;
  color: var(--ink);
}

.callout {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  margin: 1.25rem 0;
}

.callout strong {
  display: block;
  margin-bottom: 0.35rem;
}

.callout.warn {
  background: #fbf6ea;
  border-color: #e4d3a8;
}

ul,
ol {
  padding-left: 1.25rem;
}

li {
  margin: 0.35rem 0;
}

dl {
  margin: 0.75rem 0;
}

dt {
  font-weight: 600;
  margin-top: 0.85rem;
}

dd {
  margin: 0.25rem 0 0;
  color: var(--ink);
}

code,
.mono {
  font-family: var(--mono);
  font-size: 0.92em;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 0.75rem 0 1rem;
}

th,
td {
  border: 1px solid var(--line);
  padding: 0.45rem 0.55rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--panel);
}

td.num,
th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.muted {
  color: var(--muted);
}

.cta {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.65rem 1rem;
  background: var(--accent);
  color: #f7f4ef;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
}

.cta:hover {
  filter: brightness(1.05);
}

.guide-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.guide-list a {
  display: block;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin: 0.55rem 0;
  text-decoration: none;
}

.guide-list a:hover {
  border-color: var(--accent);
}

.guide-list strong {
  display: block;
  color: var(--ink);
  font-weight: 650;
}

.guide-list span {
  display: block;
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

footer.site-foot {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
  color: var(--muted);
}

.toc {
  font-size: 0.92rem;
}

.toc a {
  text-decoration: none;
}

.toc a:hover {
  text-decoration: underline;
}