:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #f5f6f8;
  --text: #111117;
  --text-secondary: #6b6b76;
  --primary: #2f6fed;
  --border: #e5e5ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0f;
    --surface: #17171d;
    --text: #f2f2f5;
    --text-secondary: #9a9aa5;
    --primary: #5b8dff;
    --border: #2a2a32;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.8;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

header.site-header a.brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

nav.site-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  margin-left: 16px;
  font-size: 0.9rem;
}

nav.site-nav a:hover { color: var(--primary); }

h1 {
  font-size: 1.6rem;
  margin-bottom: 4px;
}

h2 {
  font-size: 1.15rem;
  margin-top: 2.2em;
  border-left: 4px solid var(--primary);
  padding-left: 10px;
}

.updated {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 2em;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.92rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface);
}

.card {
  background: var(--surface);
  border-radius: 16px;
  padding: 20px;
  margin: 1.2em 0;
}

.disclaimer {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.85rem;
}

ul.link-list {
  list-style: none;
  padding: 0;
}

ul.link-list li {
  margin-bottom: 12px;
}

ul.link-list a {
  display: block;
  background: var(--surface);
  border-radius: 12px;
  padding: 14px 16px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
}

.btn {
  display: inline-block;
  background: var(--primary);
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 20px;
  border-radius: 12px;
  margin-top: 8px;
}

.btn:hover { opacity: 0.9; }