:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0071e3;
  --card: #f5f5f7;
  --border: rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #2997ff;
    --card: #1c1c1e;
    --border: rgba(255, 255, 255, 0.1);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  line-height: 1.6;
  font-size: 17px;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 24px 96px;
}

header.site {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 48px;
}

header.site .name {
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -0.01em;
}

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

h1 {
  font-size: 40px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}

h2 {
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
}

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

.lead { font-size: 20px; color: var(--muted); margin-top: 0; }

.muted { color: var(--muted); }

.updated { color: var(--muted); font-size: 15px; margin-top: 8px; }

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 40px;
}

@media (max-width: 560px) {
  .cards { grid-template-columns: 1fr; }
  h1 { font-size: 32px; }
}

.card {
  display: block;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  color: var(--fg);
}
.card:hover { text-decoration: none; border-color: var(--accent); }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

ul { padding-left: 22px; }
li { margin-bottom: 8px; }

.button {
  display: inline-block;
  margin-top: 8px;
  padding: 12px 22px;
  background: var(--accent);
  color: #fff;
  border-radius: 980px;
  font-weight: 500;
}
.button:hover { text-decoration: none; opacity: 0.9; }

footer.site {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}
footer.site a { color: var(--muted); }

.backlink { display: inline-block; margin-bottom: 24px; font-size: 15px; }