/* Skills Heatmap Specific Styles */
      .skills-heatmap-container {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 1rem;
        margin-bottom: 2rem;
      }

      @media (max-width: 576px) {
        .skills-heatmap-container {
          grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
          gap: 0.75rem;
        }
      }

      .skill-tile {
        aspect-ratio: 1;
        border: 2px solid var(--border);
        border-radius: var(--radius);
        background: var(--surface);
        padding: 1rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        text-align: center;
        cursor: pointer;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
      }

      .skill-tile:focus {
        outline: 3px solid var(--secondary);
        outline-offset: 2px;
      }

      .skill-tile:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-md);
        border-color: var(--secondary);
      }

      .skill-tile.selected {
        border-color: var(--accent);
        border-width: 3px;
        background: rgba(215, 58, 53, 0.05);
      }

      /* Proficiency level color encoding */
      .skill-tile[data-proficiency="1"] {
        background: linear-gradient(135deg, #ffffff 0%, #f0f4f8 100%);
      }

      .skill-tile[data-proficiency="2"] {
        background: linear-gradient(135deg, #e6f0ff 0%, #d0e4ff 100%);
      }

      .skill-tile[data-proficiency="3"] {
        background: linear-gradient(135deg, #b3d9ff 0%, #80bfff 100%);
      }

      .skill-tile[data-proficiency="4"] {
        background: linear-gradient(135deg, #4d94ff 0%, #1a6dcc 100%);
      }

      .skill-tile[data-proficiency="5"] {
        background: linear-gradient(135deg, #14326f 0%, #0d1f44 100%);
      }

      .skill-tile[data-proficiency="4"],
      .skill-tile[data-proficiency="5"] {
        color: var(--primary);
      }

      .skill-tile-name {
        font-size: 0.875rem;
        font-weight: 700;
        margin-bottom: 0.25rem;
        word-break: break-word;
      }

      .skill-tile-proficiency {
        font-size: 0.75rem;
        opacity: 0.8;
        font-weight: 600;
      }

      .skill-details-panel {
        position: sticky;
        top: 100px;
        border: 2px solid var(--border);
        border-radius: var(--radius);
        background: var(--surface);
        padding: 2rem;
        box-shadow: var(--shadow);
        min-height: 400px;
        transition: all 0.3s ease;
      }

      .skill-details-panel.has-content {
        border-color: var(--secondary);
      }

      .skill-details-empty {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        height: 100%;
        text-align: center;
        color: var(--muted);
      }

      .skill-details-empty svg {
        width: 64px;
        height: 64px;
        margin-bottom: 1rem;
        opacity: 0.4;
      }

      .skill-category-badge {
        display: inline-block;
        padding: 0.35rem 0.75rem;
        border-radius: 6px;
        font-size: 0.75rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        margin-bottom: 1rem;
      }

      .category-frontend {
        background: rgba(20, 50, 111, 0.1);
        color: var(--secondary);
      }

      .category-backend {
        background: rgba(215, 58, 53, 0.1);
        color: var(--accent);
      }

      .category-ai-ml {
        background: rgba(139, 92, 246, 0.1);
        color: #8b5cf6;
      }

      .category-cloud {
        background: rgba(14, 165, 233, 0.1);
        color: #0ea5e9;
      }

      .category-tools {
        background: rgba(16, 185, 129, 0.1);
        color: #10b981;
      }

      .legend-item {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        margin-bottom: 0.75rem;
      }

      .legend-box {
        width: 40px;
        height: 40px;
        border-radius: 8px;
        border: 2px solid var(--border);
      }

      .legend-label {
        font-size: 0.9rem;
        color: var(--text-light);
      }

      @media (max-width: 991px) {
        .skill-details-panel {
          position: relative;
          top: 0;
          margin-top: 2rem;
        }
        }