:root {
  --primary-color: #334155;
  --secondary-color: #475569;
  --text-color: #1f2937;
  --background-color: #f8fafc;
  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
}

body {
  margin: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
}

#app {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
  padding: 2rem 0;
}

h1 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin: 0;
  font-weight: 600;
}

.tagline {
  font-size: 1.25rem;
  color: var(--secondary-color);
  margin-top: 0.5rem;
  font-weight: 400;
}

.category {
  margin-bottom: 3rem;
}

.category h2 {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #e2e8f0;
  font-weight: 500;
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.resource-card {
  background-color: white;
  padding: 1.5rem;
  border-radius: 0.5rem;
  border: 1px solid #e2e8f0;
  transition: border-color 0.2s;
}

.resource-card:hover {
  border-color: #cbd5e1;
}

.resource-card h3 {
  color: var(--primary-color);
  margin: 0 0 0.75rem 0;
  font-size: 1.25rem;
  font-weight: 500;
}

.resource-card p {
  margin: 0 0 1rem 0;
  color: #64748b;
  font-size: 0.95rem;
  line-height: 1.5;
}

.resource-link {
  display: inline-block;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.resource-link:hover {
  border-bottom-color: var(--primary-color);
}

footer {
  text-align: center;
  padding: 2rem 0;
  margin-top: 3rem;
  color: #64748b;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  #app {
    padding: 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  .category h2 {
    font-size: 1.25rem;
  }

  .resources-grid {
    grid-template-columns: 1fr;
  }
}