:root {
  --bg: #ffffff;
  --fg: #1a1a2e;
  --muted: #5a5a72;
  --accent: #3b6fd4;
  --border: #e4e4ef;
  --max-width: 44rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14141f;
    --fg: #e8e8f0;
    --muted: #9a9ab2;
    --accent: #7aa2f0;
    --border: #2a2a3c;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0 1.25rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
    "Hiragino Sans", "Noto Sans JP", Arial, sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

header {
  padding: 2.5rem 0 1.25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.brand {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.02em;
}

h1 {
  font-size: 1.75rem;
  line-height: 1.3;
  margin: 0.75rem 0 0.5rem;
}

h2 {
  font-size: 1.25rem;
  margin: 2.25rem 0 0.75rem;
  padding-top: 0.5rem;
}

h3 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.5rem;
}

.updated {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
}

p,
li {
  color: var(--fg);
}

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

li {
  margin: 0.35rem 0;
}

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

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

.notice {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  font-size: 0.95rem;
}

.lang-switch {
  float: right;
  font-size: 0.9rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.doc-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.doc-links a {
  display: block;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem 1.25rem;
  text-decoration: none;
  flex: 1 1 14rem;
}

.doc-links a strong {
  display: block;
  color: var(--fg);
  margin-bottom: 0.25rem;
}

.doc-links a span {
  color: var(--muted);
  font-size: 0.9rem;
}