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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f9f9f9;
}

header {
  background-color: #1a1a2e;
  color: #fff;
  padding: 1rem 2rem;
}

header nav {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header .site-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
}

header .nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

header .nav-links a {
  color: #ccc;
  text-decoration: none;
  font-size: 0.95rem;
}

header .nav-links a:hover,
header .nav-links a.active {
  color: #fff;
}

main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 2rem;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: #1a1a2e;
}

h2 {
  font-size: 1.35rem;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  color: #1a1a2e;
}

p {
  margin-bottom: 1rem;
}

.subtitle {
  font-size: 1.1rem;
  color: #666;
  margin-bottom: 2rem;
}

.hero {
  text-align: center;
  padding: 2rem 0 1rem;
}

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

.hero .subtitle {
  font-size: 1.2rem;
}

ul.content-list {
  list-style: disc;
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

ul.content-list li {
  margin-bottom: 0.25rem;
}

footer {
  text-align: center;
  padding: 2rem;
  color: #888;
  font-size: 0.85rem;
}

footer a {
  color: #555;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

a {
  color: #16213e;
}

@media (max-width: 600px) {
  main {
    margin: 1rem;
    padding: 1.25rem;
  }

  header nav {
    flex-direction: column;
    gap: 0.75rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }
}