summary::-webkit-details-marker { display: none; }
summary { list-style: none; }
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: rgba(15, 23, 42, 0.5); }
::-webkit-scrollbar-thumb { background: rgba(51, 65, 85, 0.5); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(71, 85, 105, 0.7); }
.math-inline-trigger {
    cursor: pointer;
    border-bottom: 1px dashed rgba(148, 163, 184, 0.25);
    padding-bottom: 1px;
    transition: border-color 0.15s ease, opacity 0.15s ease;
    user-select: none;
}
.math-inline-trigger:hover {
    border-bottom-color: rgba(148, 163, 184, 0.6);
    opacity: 0.9;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(2px); }
    to { opacity: 1; transform: translateY(0); }
}
.animate-fade-in {
    animation: fadeIn 0.2s ease-out forwards;
}
.lesson-answer {
    line-height: 1.9;
}
.lesson-answer .lesson-paragraph {
    display: block;
    margin: 0.85rem 0;
}
.lesson-answer .lesson-paragraph:first-child {
    margin-top: 0;
}
.lesson-answer .lesson-paragraph:last-child {
    margin-bottom: 0;
}
.lesson-answer mjx-container[display="true"] {
    margin: 1rem 0 !important;
    padding: 0.75rem 1rem;
    overflow-x: auto;
    background: rgba(15, 23, 42, 0.38);
    border: 1px solid rgba(30, 41, 59, 0.7);
    border-radius: 0.75rem;
}
.lesson-answer .thin-content {
    display: block;
    margin: 1rem 0;
    padding: 0.85rem 1rem;
    background: rgba(79, 70, 229, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.18);
    border-radius: 0.75rem;
}
.lesson-answer svg {
    max-width: 100%;
}