:root {
  --brand: #1565c0;
  --bg: #ffffff;
  --fg: #1a1c1e;
  --muted: #5b6168;
  --border: #e2e5e9;
  --card-bg: #f5f7fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --fg: #e7eaed;
    --muted: #a2a9b0;
    --border: #2a2e33;
    --card-bg: #1a1e23;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
}

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

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 0;
}

.wordmark {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--fg);
  text-decoration: none;
}

nav a {
  margin-left: 24px;
  color: var(--fg);
  text-decoration: none;
  font-size: 0.95rem;
}

nav .cta {
  margin-left: 24px;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
}

.hero {
  text-align: center;
  padding: 72px 0 48px;
}

.hero h1 {
  font-size: 2.4rem;
  margin: 0 0 16px;
}

.hero p {
  color: var(--muted);
  font-size: 1.15rem;
  margin: 0 auto 32px;
  max-width: 560px;
}

.cta {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 999px;
}

.cta:hover {
  opacity: 0.9;
}

.cta.disabled {
  background: var(--border);
  color: var(--muted);
  cursor: not-allowed;
}

.cta.disabled:hover {
  opacity: 1;
}

.note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  padding: 24px 0 56px;
}

.feature {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
}

.feature .icon {
  font-size: 1.6rem;
}

.feature h3 {
  margin: 12px 0 8px;
  font-size: 1.05rem;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.closing {
  text-align: center;
  padding: 16px 0 64px;
}

.closing h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
}

footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

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

footer .links {
  margin-bottom: 8px;
}

footer .links a {
  margin: 0 8px;
}