:root {
  --text: #1c1f23;
  --muted: #5b636d;
  --accent: #1f5f8b;
  --border: #dde2e7;
  --background: #ffffff;
  --panel: #f5f7f9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e6e9ec;
    --muted: #a3acb6;
    --accent: #7db7e0;
    --border: #343a41;
    --background: #15181b;
    --panel: #1d2125;
  }
}

* {
  box-sizing: border-box;
}

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

header,
main,
footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

header .brand {
  font-weight: 700;
  font-size: 20px;
  color: var(--text);
  text-decoration: none;
}

nav a {
  margin-right: 16px;
  color: var(--muted);
  text-decoration: none;
}

nav a:last-child {
  margin-right: 0;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--accent);
}

main {
  padding-top: 32px;
  padding-bottom: 48px;
}

h1 {
  font-size: 32px;
  line-height: 1.2;
  margin: 0 0 16px;
}

h2 {
  font-size: 21px;
  margin: 32px 0 8px;
}

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

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

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 24px 0;
}

.button {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 6px;
  background: var(--accent);
  color: var(--background);
  font-weight: 600;
  text-decoration: none;
}

footer {
  padding-top: 16px;
  padding-bottom: 32px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 15px;
}

footer a {
  color: var(--muted);
}