.product-qna {
    background-color: #000;
    padding: 200px 0;
}

.product-qna__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 120px;
    display: flex;
    gap: 105px;
    align-items: flex-start;
}

.product-qna__header {
    flex-shrink: 0;
}

.product-qna__list {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.qna-item {
    position: relative;
    border-bottom: 1px solid rgba(255, 255, 255);
    display: flex;
    gap: 20px;
}

.qna-item:first-child {
    border-top: 1px solid rgba(255, 255, 255);
}

.qna-item__marker {
    width: 6px;
    background-color: var(--brand-color, #FFD700);
    flex-shrink: 0;
}

.qna-item__content {
    flex: 1;
    border-left: 12px solid var(--brand-color, #FFD700);
    padding-left: 50px;
    margin: 20px 0;
}

.qna-item__header {
    display: flex;
    align-items: center;
    gap: 20px;
    cursor: pointer;
    padding-bottom: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0);
    margin-bottom: 0;
    transition: padding-bottom 0.4s ease, border-color 0.4s ease, margin-bottom 0.4s ease;
}

.qna-item.active .qna-item__header {
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
    margin-bottom: 25px;
}

.qna-item__question {
    flex: 1;
    font-family: 'IBM Plex Sans JP', sans-serif;
    font-size: 16px;
    font-weight: 500;
    line-height: 33px;
    color: #fff;
    margin: 0;
}

.qna-item__toggle {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.3s;
    padding: 0;
}

.qna-item__toggle:hover {
    color: var(--brand-color, #FFD700);
}

.qna-item.active .qna-icon__vertical {
    display: none;
}

.qna-item__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.qna-item__answer-content {
    font-family: 'IBM Plex Sans JP', sans-serif;
    font-size: 15px;
    line-height: 33px;
    font-weight: 400;
    color: #fff;
}

.qna-item__answer-content p {
    margin: 0 0 15px;
}

.qna-item__answer-content p:last-child {
    margin-bottom: 0;
}

@media (max-width: 1025px) and (min-width: 768px) {
    .product-qna {
        padding: 150px 0;
    }

    .product-qna__container {
        padding: 0 30px;
        gap: 50px;
    }

    .qna-item__content {
        border-left-width: 7px;
        margin:13px 0;
        padding-left: 30px;
    }

    .qna-item__question {
        font-size: 14px;
        line-height: 24px;
    }

    .qna-item__answer-content {
        font-size: 13px;
        line-height: 24px;
    }
}

@media (max-width: 768px) {
    .product-qna {
        padding: 100px 0;
    }

    .product-qna__container {
        padding: 0 1rem;
        flex-direction: column;
        gap: 60px;
    }

    .product-qna__header {
        width: 100%;
    }

    .product-qna__list {
        width: 100%;
    }

    .qna-item {
        gap: 15px;
    }

    .qna-item:first-child {
        border-top: 1px solid rgba(255, 255, 255);
    }

    .qna-item__marker {
        width: 5px;
    }

    .qna-item__content {
        margin: 13px 0;
        padding-left: 30px;
        border-left-width: 8px;
    }

    .qna-item__header {
        gap: 15px;
    }

    .qna-item.active .qna-item__header {
        padding-bottom: 12px;
        margin-bottom: 20px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.5);
    }

    .qna-item__question {
        font-size: 13px;
        font-weight: 500;
        line-height: 27px;
    }

    .qna-item__toggle {
        width: 36px;
        height: 36px;
    }

    .qna-item__answer-content {
        font-size: 13px;
        font-weight: 400;
        line-height: 24px;
    }
}