:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --accent: #0a7cff;
  --border: #e5e5e5;
  --card-bg: #f7f7f8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0e10;
    --fg: #f2f2f2;
    --muted: #a0a0a0;
    --accent: #4da3ff;
    --border: #2a2a2d;
    --card-bg: #18181b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.75;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  padding: 40px 0 20px;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
}

.brand span {
  font-size: 1.3rem;
  font-weight: 700;
}

nav {
  margin-top: 16px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

nav a:hover, nav a.active {
  color: var(--accent);
}

main {
  padding: 40px 0 80px;
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 8px;
}

h2 {
  font-size: 1.25rem;
  margin-top: 2.2em;
  border-left: 4px solid var(--accent);
  padding-left: 10px;
}

.updated {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 2em;
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 24px 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.grid .card {
  margin: 0;
}

.grid h3 {
  margin-top: 0;
  font-size: 1.05rem;
}

.grid p {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 0;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
}

th, td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

th { color: var(--muted); font-weight: 600; }

.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}

footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
  font-size: 0.85rem;
}

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

li {
  margin: 0.3em 0;
}