.topic-container {
    background: white;
    border-radius: 6px;
    margin-bottom: 15px;
    padding: 15px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.345);
}

.topic-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.topic-title {
    font-size: 18px;
    font-weight: bold;
}

.arrow {
    transition: transform 0.3s ease;
    font-size: 20px;
}

.arrow.rotate {
    transform: rotate(90deg);
}

.topic-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.4s ease;
    opacity: 0;
}

.topic-content.open {
    max-height: 100%;
    opacity: 1;
    margin-top: 10px;
}