:root {
  --ink: #2c2416;
  --ink-muted: #5c4f3a;
  --primary: #8b6914;
  --primary-light: #f5eed6;
  --border: rgba(92, 79, 58, 0.22);
  --bg: #faf6ef;
  --card: #fffdf8;
  --max-width: 720px;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP",
    system-ui, sans-serif;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
}

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

header.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.25rem;
}

header.site-header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

header.site-header .brand {
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

header.site-header .links {
  display: flex;
  gap: 1rem;
  font-size: 0.875rem;
}

header.site-header .links a {
  text-decoration: none;
}

header.site-header .links a[aria-current="page"] {
  font-weight: 700;
  text-decoration: underline;
}

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

.doc-header {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.75rem;
}

.doc-header h1 {
  margin: 0 0 0.75rem;
  font-size: 1.375rem;
  line-height: 1.35;
  color: var(--ink);
}

.doc-header .meta {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--ink-muted);
}

h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.0625rem;
  color: var(--primary);
  line-height: 1.4;
}

h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 0.9375rem;
  color: var(--ink);
}

p {
  margin: 0 0 0.75rem;
}

ol,
ul {
  margin: 0 0 0.75rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.375rem;
}

li > ol,
li > ul {
  margin-top: 0.375rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.75rem 0 1rem;
  font-size: 0.875rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  overflow: hidden;
}

th,
td {
  padding: 0.625rem 0.75rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

th {
  background: var(--primary-light);
  font-weight: 700;
}

tr:last-child td {
  border-bottom: none;
}

.callout {
  background: rgba(139, 105, 20, 0.08);
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  padding: 1rem 1.125rem;
  margin: 0.75rem 0 1rem;
}

.callout strong {
  display: block;
  margin-bottom: 0.375rem;
}

.note {
  font-size: 0.875rem;
  color: var(--ink-muted);
}

footer.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
  font-size: 0.8125rem;
  color: var(--ink-muted);
  text-align: center;
}

.landing {
  text-align: center;
  padding: 3rem 0 1rem;
}

.landing h1 {
  font-size: 2rem;
  color: var(--primary);
  margin: 0 0 0.5rem;
}

.landing p {
  color: var(--ink-muted);
  margin-bottom: 2rem;
}

.landing .cards {
  display: grid;
  gap: 1rem;
  text-align: left;
}

.landing .card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.25rem 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease;
}

.landing .card:hover {
  border-color: var(--primary);
}

.landing .card h2 {
  margin: 0 0 0.375rem;
  font-size: 1rem;
}

.landing .card p {
  margin: 0;
  font-size: 0.875rem;
}

@media (max-width: 640px) {
  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}