/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f9f9f9;
  color: #333;
  line-height: 1.6;
}

/* Header */
header {
  background-color: #2c3e50;
  padding: 20px 0;
  text-align: center;
  color: #ecf0f1;
}

header h1 {
  margin-bottom: 10px;
}

nav a {
  color: #ecf0f1;
  margin: 0 15px;
  text-decoration: none;
  font-weight: bold;
}

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

/* Container */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 20px auto;
}

.categories {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 20px;
}

.category-card {
  background-color: #fff;
  border: 1px solid #ddd;
  border-radius: 10px;
  text-align: center;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  transition: transform 0.3s, box-shadow 0.3s;
}

.category-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.category-card img {
  width: 60px;
  height: 60px;
  margin-bottom: 15px;
}

.category-card h3 {
  margin: 0;
  font-size: 16px;
  color: #2c3e50;
}


/* Fixed 4 per row on desktop */
@media (min-width: 768px) {
  .categories {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ROM List */
.rom-list {
  list-style: none;
  padding: 0;
}

.rom-list li {
  background-color: #ecf0f1;
  margin-bottom: 10px;
  padding: 15px;
  border-radius: 5px;
  transition: background-color 0.3s;
}

.rom-list li:hover {
  background-color: #bdc3c7;
}

.rom-list a {
  text-decoration: none;
  color: #2c3e50;
  font-weight: bold;
}

/* Footer */
footer {
  background-color: #2c3e50;
  color: #ecf0f1;
  text-align: center;
  padding: 15px 0;
  margin-top: 40px;
}

/* Responsive Design */
@media (max-width: 600px) {
  nav a {
    display: block;
    margin: 10px 0;
  }
}