:root {
  --bg-color: #f8f9fa;
  --text-color: #212529;
  --header-bg: #343a40;
  --header-text: #ffffff;
  --card-bg: #ffffff;
  --card-hover-bg: #e9ecef;
  --card-border: #dee2e6;
  --link-color: #007bff;
}

* {
  box-sizing: border-box;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue',
    Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: 2rem 1rem;
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 2.5rem;
}

header p {
  margin: 0.5rem 0 0;
  font-weight: 300;
}

main {
  flex: 1;
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1rem;
  width: 100%;
}

h2 {
  border-bottom: 2px solid var(--card-border);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

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

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 0; /* Remove padding to allow image to span full width */
  text-decoration: none;
  color: inherit;
  transition:
    background-color 0.2s,
    transform 0.2s,
    box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  overflow: hidden; /* Ensure image corners are rounded */
}

.thumbnail-container {
  width: 100%;
  background-color: #eee;
  overflow: hidden;
  border-bottom: 1px solid var(--card-border);
}

.thumbnail {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

.card-content {
  padding: 1.5rem;
}

.card:hover {
  background-color: var(--card-hover-bg);
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card h3 {
  margin-top: 0;
  color: var(--link-color);
}

.card p {
  margin-bottom: 0;
}

footer {
  text-align: center;
  padding: 1.5rem 0;
  background-color: var(--header-bg);
  color: var(--header-text);
  margin-top: auto;
}

footer a {
  color: #a5caff; /* Lighter blue for dark background */
  text-decoration: none;
  border-bottom: 1px dashed rgba(165, 202, 255, 0.4);
  transition:
    color 0.2s,
    border-bottom-color 0.2s;
}

footer a:hover {
  color: #ffffff;
  border-bottom: 1px solid #ffffff;
}

@media (max-width: 600px) {
  header h1 {
    font-size: 2rem;
  }
}