/* Mobile Responsive Styles */
@media (max-width: 768px) {
  .presentation-title {
    font-size: 7em;
  }
}
.category-card {
    background: white;
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
    height: 100%;
}
.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}
.category-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: white;
    line-height: 1;
}
.category-icon i {
    display: block;
    width: 100%;
    text-align: center;
    line-height: 1;
}
.category-icon.teal { background-color: #a8d5d8; }
.category-icon.orange { background-color: #f5b86d; }
.category-icon.blue { background-color: #a8c8e8; }
.category-icon.tan { background-color: #d4c5a0; }
.category-icon.purple { background-color: #c4b5e8; }
.category-name {
    font-size: 16px;
    font-weight: 500;
    color: #333;
}