/* 1. Base Reset & Variables */
  :root {
    --bg-color: #f4f4f5;
    --card-bg: #ffffff;
    --text-color: #18181b;
    --subtext-color: #71717a;
    --accent-color: #2563eb;
    --card-radius: 16px;
    --gap: 1rem;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 1.5rem 1rem;
    line-height: 1.5;
  }

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

  h1 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    font-weight: 800;
  }

  p.subtitle {
    color: var(--subtext-color);
    margin: 0;
  }

  /* 2. The Grid System (Mobile First) */
  .work-grid {
    display: grid;
    /* Default: 1 column for mobile */
    grid-template-columns: 1fr;
    gap: var(--gap);
    max-width: 1000px;
    margin: 0 auto;
  }

  /* Tablet: 2 columns */
  @media (min-width: 600px) {
    .work-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  /* Desktop: 3 or 4 columns depending on width */
  @media (min-width: 900px) {
    .work-grid {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  /* 3. The Card (Link) Styling */
  .work-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border-radius: var(--card-radius);
    padding: 2rem 1.5rem;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s;
    border: 1px solid transparent;
    min-height: 180px; /* Ensures uniform height */
    position: relative;
    overflow: hidden;
  }

  /* Hover Effects (Desktop) */
  @media (hover: hover) {
    .work-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #e5e7eb;
    }
    
    .work-card:hover .card-icon {
      transform: scale(1.1);
    }
  }

  /* Active/Focus State for Accessibility */
  .work-card:focus-visible {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
  }

  /* 4. Icon & Text Styling */
  .card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    transition: transform 0.2s ease;
  }

  .card-title {
    font-size: 1.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
  }

  .card-desc {
    font-size: 0.9rem;
    color: var(--subtext-color);
    text-align: center;
    max-width: 90%;
  }

  /* Optional: External link indicator */
  .link-icon {
    font-size: 0.8rem;
    margin-top: 0.5rem;
    opacity: 0.7;
  }

  #menu-button {
  grid-column: 1 / -1;      /* span the whole row */
  margin-top: var(--gap);
  width: max-content; 
  margin-left: auto;
  margin-right: auto; 
  display: inline-block;
  text-decoration: none;
  background-color: var(--accent-color);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

#menu-button:hover {
  background-color: #1d4ed8; /* Slightly darker shade of accent */
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}

#menu-button:active {
  transform: translateY(0);
  box-shadow: var(--shadow);
}

#menu-button:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}