:root {
  color-scheme: light dark;
  --bg: #fbfaf8;
  --surface: #ffffff;
  --text: #1f1d1a;
  --muted: #5f5b54;
  --line: #e3ded5;
  --accent: #8a5a2b;
  --accent-soft: #f3ece2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16150f;
    --surface: #1e1d17;
    --text: #ece7dd;
    --muted: #a8a294;
    --line: #33312a;
    --accent: #d9a86a;
    --accent-soft: #2a2620;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 20px 96px;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP",
    "Yu Gothic UI", Meiryo, sans-serif;
  line-height: 1.85;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
}

header.site {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

header.site .logo {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0 0 8px;
}

header.site .tagline {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

h1 {
  font-size: 1.7rem;
  line-height: 1.5;
  margin: 0 0 8px;
}

h2 {
  font-size: 1.15rem;
  margin: 44px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
}

h3 {
  font-size: 1rem;
  margin: 28px 0 8px;
}

p {
  margin: 0 0 16px;
}

ul,
ol {
  margin: 0 0 16px;
  padding-left: 1.4em;
}

li {
  margin-bottom: 6px;
}

a {
  color: var(--accent);
  text-underline-offset: 2px;
}

.lead {
  font-size: 1.05rem;
  color: var(--muted);
}

.meta {
  color: var(--muted);
  font-size: 0.88rem;
  margin-bottom: 32px;
}

.features {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 16px;
}

.features li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 0;
}

.features strong {
  display: block;
  margin-bottom: 4px;
}

.features span {
  color: var(--muted);
  font-size: 0.94rem;
}

.callout {
  background: var(--accent-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 24px 0;
}

.callout p:last-child {
  margin-bottom: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 16px;
  font-size: 0.94rem;
}

.table-scroll {
  overflow-x: auto;
  margin-bottom: 16px;
}

th,
td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--accent-soft);
  font-weight: 600;
  white-space: nowrap;
}

footer.site {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

footer.site a {
  margin-right: 16px;
}