*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --navy: #1B2A6B;
  --navy-light: #243580;
  --text: #1a1a1a;
  --muted: #666;
  --bg: #f5f5f3;
}

html, body {
  height: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
}

.card {
  background: #fff;
  border-radius: 8px;
  padding: 3.5rem 3rem;
  max-width: 480px;
  width: 100%;
  text-align: center;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.07);
}

.mark {
  width: 80px;
  height: auto;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.tagline {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 1.75rem;
}

.divider {
  width: 40px;
  height: 2px;
  background: var(--navy);
  margin: 0 auto 1.75rem;
  opacity: 0.25;
}

.body {
  font-size: 1rem;
  line-height: 1.7;
  color: #444;
  margin-bottom: 2.25rem;
}

.cta {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  text-decoration: none;
  padding: 0.75rem 2rem;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: background 0.15s ease;
}

.cta:hover {
  background: var(--navy-light);
}

footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.8rem;
  color: #aaa;
}

@media (max-width: 480px) {
  .card {
    padding: 2.5rem 1.75rem;
  }
}