html, body {
  background-color: transparent;
}

.article-main p:not([class]),
.article-main ul:not([class]),
.article-main ol:not([class]),
.article-main table:not([class]),
.article-main dl:not([class]),
.article-main blockquote:not([class]),
.article-main pre:not([class]),
.article-main code:not([class]),
.article-main img:not([class]),
.article-main picture img:not([class]),
.article-main figure:not([class]),
.article-main iframe:not([class]),
.article-main object:not([class]),
.article-main hr:not([class]),
.article-main video:not([class]),
.article-main audio:not([class]) {
    margin-bottom: 2em;
}

.article-main th:not([class])::before,
.article-main dt:not([class])::before {
    font-weight: bold;
}

.article-main th:not([class]),
.article-main td:not([class]) {
    border-color: #ddd;
}

.article-main b,
.article-main strong {
  font-weight: bold;
}

.article-main a:not([class]) {
  text-decoration: underline;
}

.article-main ul:not([class]) {
  padding-left: 1.25em;
}

.article-main ul:not([class]) li {
  list-style: disc;
}

.article-main ol:not([class]) {
  padding-left: 1.25em;

}

.article-main ol:not([class]) li {
  list-style: decimal;
}

.article-main table:not([class]) {
  width: 100%;
}

.article-main table:not([class]) thead {
  border: none;
}

.article-main table:not([class]) th,
.article-main table:not([class]) td {
  box-sizing: border-box;
  padding: 0.625em;
  text-align: left;
  vertical-align: middle;
}

.article-main img:not([class]),
.article-main iframe:not([class]),
.article-main object:not([class]),
.article-main video:not([class]),
.article-main audio:not([class]) {
    line-height: 1;
}

.article-main img:not([class]),
.article-main iframe:not([class]),
.article-main object:not([class]) {
    width: 100%;
}


.article-main h2:not([class]),
.article-main h3:not([class]),
.article-main h4:not([class]),
.article-main h5:not([class]),
.article-main h6:not([class]) {
  font-weight: 600;
  line-height: 1.5;
}

.article-main h2:not([class]) {
  margin-bottom: calc(50 / 1920* 100vw);
  font-size: 1.888em;
}


.article-main h3:not([class]) {
  position: relative;
  padding: 1em 5em 1em 1.5em;
  margin: 3em 0 2em;
  font-size: 1.444em;
  background-color: #E1ECFF;
}

.article-main h3::after {
  position: absolute;
  top: 50%;
  right: -4em;
  display: block;
  width: 9em;
  height: 9em;
  content: '';
  background: url("../img/column/bg_h3.png") center / contain no-repeat;
  transform: translateY(-50%);
}


.article-main h4:not([class]) {
  margin: 2.5em 0 1.5em;
  font-size: 1.222em;
}

.article-main h5:not([class]) {
  margin: 2.75em 0 1.25em;
  font-size: 1.111em;
}

.article-main h6:not([class]) {
  margin: 3em 0 1em;
}


@media(width <= 767px) {
  .article-main h2:not([class]) {
    margin-bottom: calc(50 / 750* 100vw);
    font-size: 1.3em;
  }

  .article-main h3:not([class]) {
    font-size: 1.175em;
  }
  
  .article-main h4:not([class]) {
    font-size: 1.1em;
  }
  
  .article-main h5:not([class]) {
    font-size: 1.075em;
  }
  
}


.article-main .toc {
  position: relative;
  padding: 2em;
  margin-bottom: 6em;
  font-size: 1.35em;
  background-color: #fff;
  border: 4px solid #003484;
  border-radius: 1em;
}

.article-main .toc::before {
  position: absolute;
  top: -3em;
  left: -7em;
  z-index: -1;
  display: block;
  width: 10em;
  height: 10em;
  content: '';
  background: url("../img/column/bg_toc_l.png") center / contain no-repeat;
}

.article-main .toc::after {
  position: absolute;
  right: -4em;
  bottom: -3em;
  z-index: 1;
  display: block;
  width: 8em;
  height: 8em;
  content: '';
  background: url("../img/column/bg_toc_r.png") center / contain no-repeat;
}


.article-main .toc > span {
  display: block;
  margin-bottom: .5em;
  font-weight: 600;
}

.article-main .toc ol {
  margin-bottom: 0;
}

.article-main .toc ol li {
  margin-bottom: .5em;
  font-weight: 600;
}

.article-main .toc a {
  text-decoration: none;
}

@media(width <= 767px) {
  .article-main .toc {
    padding: 1.5em;
    font-size: 1.175em;
  }

  .article-main .toc::before {
    top: -3em;
    left: -5em;
    width: 10em;
    height: 10em;
  }
  
  .article-main .toc::after {
    right: -2em;
    bottom: -4em;
    width: 6em;
    height: 6em;
  }
}