:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --card: #f5f5f7;
  --link: #0a66c2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --card: #1c1c1e;
    --link: #4da3ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
}

header img {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  flex-shrink: 0;
}

h1 { font-size: 26px; line-height: 1.25; margin: 0; }
h2 { font-size: 20px; margin: 36px 0 8px; }

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

.card {
  background: var(--card);
  border-radius: 12px;
  padding: 4px 20px;
  margin: 24px 0;
}

footer {
  margin-top: 48px;
  color: var(--muted);
  font-size: 15px;
}