:root {
  --ground: #e9f4fd;
  --card: #ffffff;
  --ink: #10222b;
  --muted: #4a5d68;
  --rule: #cfe0ee;
  --accent: #1e5fa8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #0f1a21;
    --card: #17242d;
    --ink: #e8f1f7;
    --muted: #a3b4bf;
    --rule: #2a3b47;
    --accent: #7db7f0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 17px/1.55 ui-rounded, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 16px 64px;
}

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

h1 { font-size: 30px; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, ul { margin: 0 0 12px; }
ul { padding-left: 22px; }
li { margin-bottom: 6px; }

.lede { color: var(--muted); margin-bottom: 24px; }

.app {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}
.app img {
  width: 80px;
  height: 80px;
  border-radius: 18px;
  flex: none;
}
.app p { margin: 0; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
}
.card h2:first-child { margin-top: 0; }

nav { font-size: 15px; margin-bottom: 24px; }

footer {
  margin-top: 40px;
  font-size: 14px;
  color: var(--muted);
}