/* Custom background and text styling */
    body {
      background-color: #121212;
      color: #eee;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      margin: 0;
      padding: 0;
      min-height: 100vh;
      scroll-behavior: smooth;
      display: flex;
      flex-direction: column;
    }
    /* Header bar */
    .header-bar {
      background: #1f1f1f;
      padding: 1rem 2rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 2px 5px rgba(0,0,0,0.7);
      position: sticky;
      top: 0;
      z-index: 100;
    }
    .header-bar .logo {
      height: 40px;

    }
    .header-bar .nav-links a {
      margin-left: 1rem;
      color: #bbb;
      font-weight: 600;
      text-decoration: none;
      transition: color 0.3s ease;
    }
    .header-bar .nav-links a:hover {
      color: #fff;
    }

    /* Section backgrounds with subtle overlays */
    section.section {
      padding-top: 3rem;
      padding-bottom: 3rem;
      background: #181818;
      border-bottom: 1px solid #222;
    }
    section.section.alt {
      background: #202020;
    }

    /* Container max width */
    .container {
      max-width: 960px;
      margin: 0 auto;
    }

    /* Card custom styling */
    .card {
      background: #2a2a2a;
      border-radius: 8px;
      box-shadow: 0 3px 8px rgba(0,0,0,0.5);
      transition: box-shadow 0.3s ease;
      color: #ddd;
    }
    .card:hover {
      box-shadow: 0 6px 16px rgba(0,0,0,0.8);
    }
    .card .card-content {
      padding: 1.5rem;
    }
    .card .title, .card .subtitle {
      color: #eee;
    }

    /* Popup image fixed at bottom right, hidden initially */
    #tika-popup {
      position: fixed;
      bottom: 10px;
      right: 10px;
      width: 80px;
      height: 80px;
      border-radius: 50%;
      border: none;
      box-shadow: none;
      background: transparent;
      object-fit: contain;
      transform: translateY(100%);
      transition: transform 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      pointer-events: none;
      z-index: 1100;
      cursor: pointer;
    }

    /* Slide popup up and fade in on hover */
    #tika-link:hover + #tika-popup {
      transform: translateY(0);
      opacity: 1;
      pointer-events: auto;
    }

    /* Footer styling */
    footer.footer {
      background: #1f1f1f;
      color: #bbb;
      padding: 1rem 2rem;
      text-align: center;
      font-size: 0.9rem;
      margin-top: auto;
      box-shadow: 0 -2px 5px rgba(0,0,0,0.7);
      position: relative;
      /* keep relative for stacking context */
    }
    footer.footer a {
      color: #48c774;
      text-decoration: none;
      font-weight: 600;
    }
    footer.footer a:hover {
      color: #67d98a;
    }

    /* Responsive spacing and fonts */
    @media (max-width: 768px) {
      .header-bar {
        flex-direction: column;
        gap: 0.5rem;
      }
      .header-bar .nav-links {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
      }
      #tika-popup {
        width: 64px;
        height: 64px;
      }
    }