:root {
  --background-color: #0d1117;
  --card-background-color: #161b22;
  --card-hover-background: #1f2d3d;
  --text-color: #c9d1d9;
  --link-color: #58a6ff;
  --padding: 2rem;
  --card-padding: 1.5rem;
  --card-margin-bottom: 1rem;
  --card-border-radius: 0.5rem;
  --card-border: 1px solid #30363d;
  --card-hover-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
  --transition-duration: 0.3s;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  padding: var(--padding);
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial,
    sans-serif;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  text-align: center;
}

h1 {
  margin-bottom: 1.5rem;
}

h2 {
  margin: 2rem 0 1rem;
}

/* Section grid */
section {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--card-margin-bottom);
  width: 100%;
  margin: 2rem;
}

/* Card styles */
.card {
  background-color: var(--card-background-color);
  border: var(--card-border);
  border-radius: var(--card-border-radius);
  padding: var(--card-padding);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
  text-decoration: none;
  transition: background-color var(--transition-duration) ease,
    box-shadow var(--transition-duration) ease,
    border-color var(--transition-duration) ease;
  /* On larger screens, keep a square card */
  aspect-ratio: 1/1;
}

.card img {
  width: 80px;
  height: auto;
  border-radius: var(--card-border-radius);
}

.card .description {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
}

.card h3 {
  font-size: 1.25rem;
  margin: 0.5rem 0;
  color: var(--link-color);
}

.card span {
  font-size: 1rem;
  padding: 0.25rem 0.75rem;
  width: fit-content;
  border-radius: var(--card-border-radius);
  border: var(--card-border);
  background-color: var(--card-background-color);
  color: var(--text-color);
  display: inline-block;
  transition: background-color var(--transition-duration) ease,
    border-color var(--transition-duration) ease,
    color var(--transition-duration) ease;
}

.card:hover span {
  cursor: pointer;
}

/* Blue Tag */
.tag-blue {
  color: #0366d6;
}
.tag-blue:hover {
  background: linear-gradient(45deg, #58a6ff, #0366d6);
  color: #ffffff;
  border-color: #0366d6;
}

/* Green Tag */
.tag-green {
  color: #28a745;
}
.tag-green:hover {
  background: linear-gradient(45deg, #85e89d, #28a745);
  color: #ffffff;
  border-color: #28a745;
}

/* Purple Tag */
.tag-purple {
  color: #6f42c1;
}
.tag-purple:hover {
  background: linear-gradient(45deg, #b392f0, #6f42c1);
  color: #ffffff;
  border-color: #6f42c1;
}

/* Red Tag */
.tag-red {
  color: #d73a49;
}
.tag-red:hover {
  background: linear-gradient(45deg, #f97583, #d73a49);
  color: #ffffff;
  border-color: #d73a49;
}

.card p {
  font-size: 1rem;
  line-height: 1.4;
  color: var(--text-color);
}

.card:hover {
  background-color: var(--card-hover-background);
  box-shadow: var(--card-hover-shadow);
  border-color: var(--link-color);
  cursor: pointer;
}

footer {
  margin-top: 2rem;
}

footer a {
  color: var(--link-color);
  text-decoration: none;
  transition: color var(--transition-duration) ease;
}

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

/* Responsive grid layout */
@media screen and (min-width: 768px) {
  section {
    grid-template-columns: repeat(2, 1fr);
    margin: 2rem auto;
  }
}

@media screen and (min-width: 1024px) {
  section {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media screen and (min-width: 1200px) {
  section {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Mobile specific tweaks */
@media screen and (max-width: 767px) {
  /* Remove fixed aspect ratio so cards can expand based on content */
  .card {
    aspect-ratio: unset;
    padding: 1rem;
  }

  /* Reduce section margin for better spacing on small devices */
  section {
    margin: 1rem 0;
  }

  /* Scale down images and adjust font sizes if needed */
  .card img {
    width: 60px;
  }

  .card h3 {
    font-size: 1.1rem;
  }

  .card p {
    font-size: 0.95rem;
  }

  .card span {
    font-size: 0.95rem;
    padding: 0.2rem 0.5rem;
  }
}