#category-index {
    padding: 0 0 3rem 0;
}

.chapter {
    padding-top: 2.5rem;
}
.chapter+.chapter {
    /*margin-top: 1rem;*/
    margin-top: 3.0rem;
    padding-top: 3.0rem;
    border-top: dashed 1px #999;
}

.chapter-head-title {
    font-size: 1.5rem;
    line-height: 1.667;
    font-weight: 900;
    margin: 0 0 0.25rem 0;
}
.chapter-head-description {
    margin: 0;
}

.chapter .section {
    padding-top: 1.25rem;
    padding-left: 1.56125rem;
    position: relative;
}
.chapter .section::before {
    content: "";
    display: block;
    width: 0.3125rem;
    height: calc(100% - 2.25rem);
    background-color: #eee;
    position: absolute;
    top: 1.75rem;
    left: 0;
}
.chapter .section-head-title {
    font-size: 1.25rem;
    line-height: 1.8;
    font-weight: 900;
    margin: 0 0 0.25rem;
}
.chapter .section-head-description {
    margin: 0;
}

.chapter ul {
    counter-reset: list-item;
    /*
    border-top: dashed 1px #999;
    margin: 1.0rem 0 0 0;
    */
    margin: 1.0rem 0 0 0;
    padding: 1.0rem 0 0 0;
    display: flex;
    flex-direction: column;/*column-reverse;*/
}
.chapter ul li {
    position: relative;
    padding-left: 2rem;
}
.chapter ul li::before {
    content: counter(list-item, decimal-leading-zero) ".";
    position: absolute;
    top: 0;
    left: 0;
}

.chapter a {
    color: #3282d3; 
    text-decoration: underline;
}

@media screen and (min-width: 768px)
{
    #category-index {
        padding-top: 0;
        padding-bottom: 6.25rem;
    }
    .chapter {
        padding-top: 5.25rem;
    }
    .chapter+.chapter {
        margin-top: 3.25rem;
        padding-top: 6.5rem;
    }

    .chapter-head-title {
        font-size: 1.5rem;
        margin: 0 0 0.25rem 0;
    }

    .chapter .section {
        padding-top: 3.25rem;
        padding-left: 3.25rem; padding-left: 3.875rem;
    }
    .chapter .section+.section {
        margin-top: 1.0rem;
    }
    .chapter .section::before {
        width: 0.625rem;
        height: calc(100% - 4.25rem);
        top: 3.75rem;
    }
    .chapter .section-head-title {
        margin: 0 0 0.25rem;
    }

    .chapter ul {
        margin-top: 3.25rem; margin-top: 2.0rem;
        padding-top: 3.25rem; padding-top: 0;
    }
    .chapter ul li {
        padding-left: 2rem;
    }
}