body {
            font-family: 'Inter', sans-serif;
            background-color: #FDFBF7;
            color: #38332B;
        }
        h1, h2, h3, h4 {
            font-family: 'Zilla Slab', serif;
        }
        .station-card {
            background-color: #F2EAD3;
            border: 1px solid #DFD7BF;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .station-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.05);
        }
        .btn-primary {
            background-color: #A87C7C;
            color: white;
            transition: background-color 0.3s ease;
        }
        .btn-primary:hover {
            background-color: #8c6666;
        }
        .input-field {
            background-color: #FDFBF7;
            border: 1px solid #DFD7BF;
            color: #38332B;
        }
        .nav-link {
            transition: color 0.3s ease, border-bottom-color 0.3s ease;
            border-bottom: 2px solid transparent;
        }
        .nav-link:hover, .nav-link.active {
            color: #A87C7C;
            border-bottom-color: #A87C7C;
        }
        .case-grid > div {
            border: 2px solid #DFD7BF;
            cursor: pointer;
            transition: background-color 0.3s ease, border-color 0.3s ease;
        }
        .case-grid > div:hover { background-color: #FFF; }
        .case-grid > div.active { background-color: #e3d5b8; border-color: #A87C7C; }

        .set-card {
            border: 2px solid #DFD7BF;
            background: white;
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
            gap: 0.5rem;
            width: 100px;
            height: 150px;
            flex-shrink: 0;
            padding: 8px;
        }
        details > summary {
            cursor: pointer;
            font-family: 'Zilla Slab', serif;
            font-size: 1.5rem;
            font-weight: 600;
            padding: 0.75rem 1rem;
            background-color: #F2EAD3;
            border-radius: 0.5rem;
            margin-top: 1rem;
            transition: background-color 0.2s ease;
        }
        details > summary:hover { background-color: #e3d5b8; }
        details[open] > summary { border-bottom-left-radius: 0; border-bottom-right-radius: 0; }
        .details-content {
            padding: 1.5rem;
            border: 1px solid #DFD7BF;
            border-top: none;
            border-bottom-left-radius: 0.5rem;
            border-bottom-right-radius: 0.5rem;
            background-color: #FDFBF7;
        }
        code {
             background-color: rgba(168, 124, 124, 0.1);
             color: #A87C7C;
             padding: 0.1em 0.3em;
             border-radius: 4px;
        }

        /* Styles for the new details/summary solution toggles */
        .solution-toggle > summary {
            display: inline-block;
            list-style: none; /* remove triangle marker */
            padding: 0.25rem 0.75rem;
            font-size: 0.875rem; /* text-sm */
            border-radius: 0.25rem; /* rounded */
            cursor: pointer;
            background-color: #A0A083;
            color: white;
            transition: background-color 0.3s ease;
            font-family: 'Inter', sans-serif;
            font-weight: 500;
        }
        .solution-toggle > summary::-webkit-details-marker { display: none; }
        .solution-toggle > summary:hover { background-color: #8a8a6e; }
        .solution-content {
            background-color: rgba(255, 255, 255, 0.5);
            border-left: 3px solid #A87C7C;
            padding: 0.75rem;
            margin-top: 0.5rem;
            border-radius: 0.25rem;
        }