body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: #f9f9f9;
  color: #111;
}

header {
  background-color: #fff;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  padding: 0;
  margin-bottom: 1rem;
}

nav li {
  margin: 0 1rem;
}

nav a {
  text-decoration: none !important;
  font-weight: 500;
  color: #333;
  transition: color 0.3s ease, border-bottom 0.3s ease;
  padding-bottom: 0.25rem;
  border-bottom: 2px solid transparent;
}

nav a:hover {
  color: #007aff;
  border-bottom: 2px solid #007aff;
  text-decoration: none;
}

nav a.active {
  border-bottom: 2px solid #007aff;
  color: #007aff;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background-color: white;
  border-radius: 1rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  padding: 1.5rem;
  margin-bottom: 2rem;
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
}

h1, h2 {
  color: #222;
}

footer {
  text-align: center;
  font-size: 0.9rem;
  color: #aaa;
  padding: 2rem 1rem;
  border-top: 1px solid #eee;
}

a {
  color: #007aff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.hero {
  text-align: center;
  margin: 3rem 0;
}

.highlight .card a {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: bold;
  color: #007aff;
}

.highlight .card a:hover {
  color: #005ecb;
}