:root {
  --text: #1a1a1a;
  --muted: #555;
  --bg: #ffffff;
  --border: #e5e5e5;
  --link: #1a4d8f;
  --max-width: 720px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
}

header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  font-weight: 600;
  font-size: 18px;
  color: var(--text);
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 24px;
}

nav a {
  color: var(--muted);
  font-size: 15px;
}

nav a:hover {
  color: var(--text);
}

main {
  padding: 56px 0 80px;
}

h1 {
  font-size: 32px;
  font-weight: 600;
  margin: 0 0 24px;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 40px 0 12px;
}

p {
  margin: 0 0 18px;
}

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

ul.plain {
  list-style: none;
  padding: 0;
  margin: 0 0 18px;
}

ul.plain li {
  margin-bottom: 8px;
}

footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
  font-size: 14px;
}

footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

@media (max-width: 480px) {
  h1 { font-size: 26px; }
  main { padding: 32px 0 56px; }
}