:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --fg-muted: #555;
  --accent: #2563eb;
  --border: #e5e5e5;
  --code-bg: #f4f4f5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --fg: #e5e5e5;
    --fg-muted: #a3a3a3;
    --accent: #60a5fa;
    --border: #262626;
    --code-bg: #1a1a1a;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.site {
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
}

header.site a.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
  text-decoration: none;
}

h1 {
  font-size: 28px;
  margin: 0 0 8px;
}

h2 {
  font-size: 20px;
  margin: 40px 0 12px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

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

p, ul, ol, table {
  margin: 12px 0;
}

ul, ol {
  padding-left: 24px;
}

li {
  margin: 4px 0;
}

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

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

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

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

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

.meta {
  color: var(--fg-muted);
  font-size: 14px;
}

.hero {
  text-align: center;
  padding: 64px 0 48px;
}

.hero h1 {
  font-size: 40px;
  margin-bottom: 12px;
}

.hero p {
  color: var(--fg-muted);
  font-size: 18px;
}

.links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 32px;
}

.links a {
  display: inline-block;
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  color: var(--fg);
}

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

footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--fg-muted);
  font-size: 14px;
}