body {
            font-family: 'Inter', sans-serif;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease-in-out;
        }
        .section-container, .checklist-item {
            transition: opacity 0.4s ease, transform 0.4s ease, height 0.4s ease;
        }
        .item-hidden {
             opacity: 0;
             transform: scale(0.95);
             height: 0 !important;
             margin-top: 0 !important;
             margin-bottom: 0 !important;
             padding-top: 0 !important;
             padding-bottom: 0 !important;
             overflow: hidden;
        }
        .section-hidden {
            display: none;
        }
        .rotate-180 { transform: rotate(180deg); }
        .transition-all-smooth { transition: all 0.3s ease-in-out; }
        .custom-checkbox:checked {
            background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 16 16' fill='white' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M12.207 4.793a1 1 0 010 1.414l-5 5a1 1 0 01-1.414 0l-2-2a1 1 0 011.414-1.414L6.5 9.086l4.293-4.293a1 1 0 011.414 0z'/%3e%3c/svg%3e");
            background-size: 100% 100%;
            background-position: center;
            background-repeat: no-repeat;
        }
        .custom-checkbox:checked + label {
            text-decoration: line-through;
            color: #64748b; /* slate-500 */
        }
        .modal { transition: opacity 0.3s ease-in-out; }
        .modal > div { transition: transform 0.3s ease-in-out; }