@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');

* {
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  background: #fff;
  color: #333;
  line-height: 1.6;
}

header {
  background: #003366;
  color: #fff;
  padding: 1rem;
  text-align: center;
}

#course-title {
  display: block;
  font-size: 1.5rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}

nav {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

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

main {
  max-width: 1000px;
  margin: 2rem auto;
  padding: 0 1rem;
}

main h1 {
  text-align: center;
  margin-bottom: 2rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.card {
  border: 1px solid #ddd;
  padding: 1rem;
  background: #fafafa;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.card img {
  max-width: 100%;
  height: auto;
  margin: 1rem 0;
}

.card h2 {
  margin-top: 0;
}

footer {
  background: #f1f1f1;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  transform: translateY(-2px);
  transition: box-shadow 0.2s, transform 0.2s;
}