:root {
  color-scheme: light dark;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --background: #ffffff;
  --accent: #7c5cff;
  --rule: #e5e5ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --secondary: #a1a1a6;
    --background: #000000;
    --accent: #a48bff;
    --rule: #2c2c2e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}

/* The app's icon, centred at the top, in the rounded shape iOS gives it. */
header.brand { text-align: center; margin-bottom: 8px; }
.logo {
  width: 96px;
  height: 96px;
  border-radius: 22.37%;
  box-shadow: 0 8px 24px rgba(124, 92, 255, 0.25);
}

h1 { font-size: 40px; line-height: 1.1; margin: 28px 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 22px; margin: 40px 0 8px; letter-spacing: -0.01em; }
h3 { font-size: 18px; margin: 24px 0 4px; }

p, li { color: var(--text); }
.updated { color: var(--secondary); margin: 0 0 32px; }
.summary {
  border: 1px solid var(--rule);
  border-radius: 16px;
  padding: 16px 20px;
  margin: 24px 0 8px;
}
.summary ul { margin: 8px 0 0; padding-left: 20px; }

a { color: var(--accent); }
footer {
  margin-top: 64px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  color: var(--secondary);
  font-size: 15px;
}
footer a { margin-right: 16px; }