body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #f7f9fc;
  color: #333;
  line-height: 1.6;
}

header {
  background: #0a58ca;
  color: #fff;
  padding: 40px 20px;
  text-align: center;
}

nav {
  background: #fff;
  padding: 10px;
  text-align: center;
  border-bottom: 1px solid #ddd;
}

nav a {
  margin: 0 15px;
  text-decoration: none;
  color: #0a58ca;
  font-weight: bold;
}

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

main {
  max-width: 900px;
  margin: auto;
  padding: 20px;
}

section {
  background: #fff;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 6px;
}

h2 {
  color: #0a58ca;
}

ul {
  padding-left: 20px;
}

ul li {
  margin-bottom: 10px;
}

ul li a {
  text-decoration: none;
  color: #333;
}

ul li a:hover {
  color: #0a58ca;
}

footer {
  text-align: center;
  padding: 20px;
  background: #fff;
  border-top: 1px solid #ddd;
  font-size: 14px;
}
/* Dark Mode */
body.dark {
  background: #121212;
  color: #e0e0e0;
}

body.dark header {
  background: #1f1f1f;
}

body.dark nav,
body.dark section,
body.dark footer {
  background: #1a1a1a;
  border-color: #333;
}

body.dark a {
  color: #4dabf7;
}

body.dark pre {
  background: #2a2a2a;
  color: #f1f1f1;
}
/* Tutorial Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 15px;
  margin-top: 15px;
}

.card {
  display: block;
  padding: 18px;
  background: #0a58ca;
  border-radius: 50px;
  text-decoration: none;
  color: #333;
  font-weight: bold;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.15);
}

/* Dark mode support */
body.dark .card {
  background: #1e1e1e;
  color: #e0e0e0;
}