:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6e6e73;
  --accent: #0a84ff;
  --border: #e5e5ea;
  --code-bg: #f5f5f7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --fg: #f2f2f7;
    --muted: #98989d;
    --accent: #0a84ff;
    --border: #38383a;
    --code-bg: #2c2c2e;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header {
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

header .breadcrumbs {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 8px;
}

header h1 {
  font-size: 28px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

header .meta {
  font-size: 13px;
  color: var(--muted);
}

h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 40px 0 12px;
  letter-spacing: -0.005em;
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
}

p,
ul,
ol {
  margin: 0 0 16px;
}

ul,
ol {
  padding-left: 1.4em;
}

li {
  margin-bottom: 6px;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
}

dl {
  margin: 16px 0;
}

dl dt {
  font-weight: 600;
  margin-top: 12px;
}

dl dd {
  margin: 4px 0 0 0;
  color: var(--fg);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

th,
td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  background: var(--code-bg);
  font-weight: 600;
}

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
}

footer .lang-switch {
  margin-bottom: 8px;
}

footer .lang-switch a {
  margin-right: 12px;
}

.index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}

@media (min-width: 600px) {
  .index-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.index-card {
  display: block;
  padding: 20px 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--fg);
  text-decoration: none;
  transition: border-color 0.15s ease;
}

.index-card:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.index-card h2 {
  margin: 0 0 4px;
  font-size: 18px;
}

.index-card p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.callout {
  background: var(--code-bg);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 14px;
  margin: 16px 0;
}