:root {
  --pg-text: #1f2328;
  --pg-muted: #4b5563;
  --pg-bg: #ffffff;
  --pg-surface: #f7f8fa;
  --pg-border: #e5e7eb;
  --pg-brand: #111827;
  --pg-accent: #2563eb;
  --pg-radius: 0.75rem;
  --pg-width: 42rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--pg-text);
  background: var(--pg-bg);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

header {
  border-bottom: 1px solid var(--pg-border);
  background: var(--pg-surface);
  padding: 1rem 1.25rem;
}

.nav {
  max-width: var(--pg-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--pg-brand);
  font-weight: 700;
  font-size: 1.125rem;
}

.brand svg,
.brand img {
  width: 1.75rem;
  height: 1.75rem;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9375rem;
}

main {
  max-width: var(--pg-width);
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

footer {
  max-width: var(--pg-width);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  color: var(--pg-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--pg-border);
}

h1, h2, h3 {
  color: var(--pg-brand);
  line-height: 1.25;
}

h1 {
  font-size: 2rem;
  margin: 0 0 0.75rem;
}

h2 {
  font-size: 1.375rem;
  margin: 2rem 0 0.75rem;
}

h3 {
  font-size: 1.125rem;
  margin: 1.5rem 0 0.5rem;
}

p, ul, ol {
  margin: 0 0 1rem;
}

ul, ol {
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

.last-updated {
  color: var(--pg-muted);
  font-size: 0.875rem;
  margin-bottom: 2rem;
}

.hero {
  text-align: center;
  padding: 2.5rem 0 2rem;
}

.hero h1 {
  font-size: 2.5rem;
}

.tagline {
  font-size: 1.25rem;
  color: var(--pg-muted);
  margin-bottom: 1.5rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.card {
  display: block;
  padding: 1.25rem;
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius);
  background: var(--pg-surface);
  color: var(--pg-text);
}

.card:hover {
  border-color: var(--pg-accent);
  text-decoration: none;
}

.card h2 {
  margin-top: 0;
  font-size: 1.125rem;
}

.card p {
  margin-bottom: 0;
  font-size: 0.9375rem;
  color: var(--pg-muted);
}

.faq details {
  margin-bottom: 1rem;
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius);
  padding: 1rem;
  background: var(--pg-surface);
}

.faq summary {
  font-weight: 600;
  cursor: pointer;
}

.faq p {
  margin: 0.75rem 0 0;
}

@media (max-width: 640px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  h1 {
    font-size: 1.625rem;
  }

  .hero h1 {
    font-size: 2rem;
  }
}