.introduction-page {
    font-family: GoogleSans, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.42857143;
    color: #fff;
    background-color: #000;
    padding-top: 59px;
}

.nav-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    padding: 20px 0;
    position: fixed;
    width: 100%;
    z-index: 1;
    background-color: #000;
}

.nav-item {
    font-family: GoogleSans Medium, Arial, sans-serif;
    font-size: 18px;
    width: fit-content;
    padding: 10px 20px;
    border: 1px solid #6B6B6B;
    border-radius: 40px;
    cursor: pointer;
}

.nav-item.active {
    background-color: #0360E2;
    border: 1px solid #0360E2;
}

.introduction-content {
    background-color: #181818;
    padding: 30px;
    margin-top: 60px;
}

.ci-title {
    font-family: GoogleSans Bold, Arial, sans-serif;
    font-size: 24px;
    padding-bottom: 20px;
}

.content-item {
    padding-top: 60px;
}

.structure {
    display: flex;
    justify-content: space-between;
    padding-top: 40px;
}

.structure-item {
    display: flex;
}

.structure-text {
    padding-left: 16px;
}

.structure-title {
    font-family: GoogleSans Medium, Arial, sans-serif;
    font-size: 18px;
    padding-bottom: 8px;
}

.structure-des {
    font-size: 14px;
}

@media (max-width: 767px) {
    .introduction-page {
        font-size: 14px;
    }

    .nav-item {
        font-size: 12px;
    }

    .content-item {
        padding-top: 20px;
    }

    .ci-title {
        font-size: 20px;
    }

    .structure {
        flex-direction: column;
        gap: 20px;
    }

    .structure-title {
        font-size: 16px;
    }
}