/* Reset and basic styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background-color: #f4f7f6;
  color: #333;
  line-height: 1.6;
  padding: 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.main-nav {
  background-color: #2c3e50;
  border-radius: 8px;
  margin-bottom: 20px;
  padding: 15px 20px;
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
}

.main-nav a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  font-size: 1.1rem;
  transition: color 0.2s ease;
}

.main-nav a:hover {
  color: #3498db;
}

header {
  text-align: center;
  margin-bottom: 40px;
}

header h1 {
  font-size: 2.5rem;
  color: #2c3e50;
  margin-bottom: 10px;
}

header p {
  color: #7f8c8d;
  font-size: 1.1rem;
}

/* Filters */
.filters {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 30px;
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

@media (min-width: 768px) {
  .filters {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.filter-group label {
  font-weight: 600;
  font-size: 0.9rem;
  color: #34495e;
}

.filter-group select,
.filter-group input {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
  min-width: 200px;
}

.filter-group input {
  width: 100%;
}

/* Cards Grid */
.cards-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.card {
  background: #fff;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0,0,0,0.1);
}

.card h2 {
  font-size: 1.5rem;
  margin-bottom: 10px;
  color: #2c3e50;
}

.card p {
  color: #555;
  margin-bottom: 15px;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 15px;
}

.category {
  background-color: #3498db;
  color: #fff;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: bold;
}

.tag {
  background-color: #e0e0e0;
  color: #333;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
}

.card-link {
  display: inline-block;
  text-decoration: none;
  background-color: #2ecc71;
  color: #fff;
  padding: 10px 15px;
  border-radius: 4px;
  text-align: center;
  font-weight: bold;
  transition: background-color 0.2s ease;
}

.card-link:hover {
  background-color: #27ae60;
}

/* No results message */
.no-results {
  text-align: center;
  font-size: 1.2rem;
  color: #7f8c8d;
  grid-column: 1 / -1;
  padding: 40px;
}