:root {
  --bg: #f6f5f1;
  --text: #1c1f24;
  --muted: #5d636d;
  --accent: #2f5d8a;
  --rule: #d9d6cc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --text: #e6e4de;
    --muted: #9aa0a8;
    --accent: #8fb6dd;
    --rule: #2a2f36;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

main {
  flex: 1;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 18vh 20px 48px;
}

.mark {
  width: 48px;
  height: 48px;
  color: var(--accent);
}

h1 {
  margin: 16px 0 4px;
  font-size: 2.4rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.tagline {
  margin: 0 0 40px;
  color: var(--muted);
  font-size: 1.15rem;
}

h2 {
  margin: 40px 0 12px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

ul { padding-left: 1.1em; margin: 0; }
li { margin-bottom: 10px; }

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

footer {
  padding: 24px 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}