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;
        }
        .btn-primary {
            background-color: #A87C7C;
            color: white;
            transition: background-color 0.3s ease;
        }
        .btn-primary:hover {
            background-color: #8c6666;
        }
        .btn-secondary {
            background-color: #A0A083;
            color: white;
            transition: background-color 0.3s ease;
        }
        .btn-secondary:hover {
            background-color: #8a8a6e;
        }
        .topic-container > summary {
            cursor: pointer;
            font-family: 'Zilla Slab', serif;
            font-size: 1.5rem; /* text-2xl */
            font-weight: 600;
            padding: 1rem 1.5rem;
            background-color: #F2EAD3;
            border: 1px solid #DFD7BF;
            border-radius: 0.75rem; /* rounded-xl */
            margin-top: 1.5rem;
            transition: background-color 0.2s ease;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .topic-container > summary:hover { background-color: #e3d5b8; }
        .topic-container[open] > summary { border-bottom-left-radius: 0; border-bottom-right-radius: 0; }
        .topic-content {
            padding: 1.5rem;
            border: 1px solid #DFD7BF;
            border-top: none;
            border-bottom-left-radius: 0.75rem;
            border-bottom-right-radius: 0.75rem;
            background-color: #FDFBF7;
        }
        .question {
            margin-top: 1rem;
            padding: 1rem;
            background-color: rgba(168, 124, 124, 0.05);
            border-left: 4px solid #A87C7C;
            font-style: italic;
            font-weight: 500;
        }
        .toggle-box > summary {
            display: inline-block;
            list-style: none;
            padding: 0.25rem 0.75rem;
            font-size: 0.875rem;
            border-radius: 0.25rem;
            cursor: pointer;
            color: white;
            transition: background-color 0.3s ease;
            font-family: 'Inter', sans-serif;
            font-weight: 500;
        }
        .toggle-box > summary::-webkit-details-marker { display: none; }
        .toggle-box > summary:hover { opacity: 0.85; }
        .hint-box > summary { background-color: #A0A083; }
        .solution-box {
            background-color: rgba(255, 255, 255, 0.8);
            border: 1px solid #DFD7BF;
            border-left: 3px solid #A87C7C;
            padding: 1rem;
            margin-top: 1rem;
            border-radius: 0.5rem;
        }
        code {
             background-color: rgba(168, 124, 124, 0.1);
             color: #A87C7C;
             padding: 0.1em 0.3em;
             border-radius: 4px;
        }