:root {
  --blue: #0a2e6d;
  --blue-light: #eef4ff;
  --text: #172033;
  --muted: #667085;
  --border: #e4e7ec;
  --white: #ffffff;
  --background: #f8fafc;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial,
    sans-serif;
  color: var(--text);
  background: var(--background);
  line-height: 1.65;
}

header {
  background: var(--blue);
  color: white;
}

nav {
  max-width: 1000px;
  margin: auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: white;
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 800;
}

nav div {
  display: flex;
  gap: 20px;
}

nav div a {
  color: white;
  text-decoration: none;
}

main {
  max-width: 900px;
  margin: auto;
  padding: 56px 24px 80px;
}

.hero {
  text-align: center;
  padding: 80px 24px;
}

.hero h1 {
  font-size: clamp(2.5rem, 8vw, 5rem);
  margin: 0;
  color: var(--blue);
}

.hero p {
  max-width: 650px;
  margin: 20px auto;
  color: var(--muted);
  font-size: 1.2rem;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 28px;
  margin: 24px 0;
}

h1,
h2,
h3 {
  line-height: 1.25;
}

h1,
h2 {
  color: var(--blue);
}

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

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

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

footer {
  border-top: 1px solid var(--border);
  padding: 30px 24px;
  text-align: center;
  color: var(--muted);
}

footer a {
  margin: 0 8px;
}

@media (max-width: 600px) {
  nav {
    align-items: flex-start;
    flex-direction: column;
  }

  nav div {
    flex-wrap: wrap;
  }

  main {
    padding-top: 32px;
  }
}