.content h2 {
  margin-top: 50px;
  margin-bottom: 30px;
  padding-bottom: 15px;
  border-bottom: solid 4px #4682b4;
}
.content h3 {
  margin-top: 40px;
  margin-bottom: 10px;
  padding: 5px 15px;
  border-left: solid 4px #48d1cc;
}
.content h4 {
  margin-top: 30px;
  margin-bottom: 10px;
  padding: 5px 15px;
  color: #505050;
  display: inline-block;
  line-height: 1.3;
  background: #e6e6fa;
  vertical-align: middle;
  border-radius: 25px;
}
.content h4:before {
  content: '●';
  color: white;
  margin-right: 8px;
}





















/**
 * modified, tag
 */
.posts_date_tag { margin: 15px 0 40px; }
.posts_date_tag ul li {
  list-style: none;
  margin-right: 10px;
}
.posts_date_tag ul li:last-child { margin-left: 40px; }
.posts_date_tag ul li:last-child::before {
  content: '\f017';
  font-family: 'Font Awesome 6 Free';
  font-weight: bold;
  margin-right: 3px;
}
.posts_date_tag ul li:last-child { margin-right: 0; }
.posts_date_tag ul li,
.posts_date_tag ul li a { font-size: 13px; }
.posts_date_tag ul li a {
  padding: 2px 12px;
  color: #b22222;
  border: solid 1px #b22222;
  border-radius: 5px;
}
.pc .posts_date_tag ul li a:hover {
  color: #fff;
  background: #b22222;
}
@media screen and (max-width: 991px){
  .posts_date_tag ul li { margin-bottom: 1rem; }
  .posts_date_tag ul li:last-child { margin-left: 1rem; }
}












#toc_container {
  margin-top: 60px;
  margin-bottom: 100px;
  padding: 0;
  width: 100%;
  border: 0;
  box-shadow: 0 0 5px #eee;
}
#toc_container .toc_title {
  cursor: pointer;
  position: relative;
  text-align: center;
  margin-bottom: 0;
  padding: 10px;
  background: #e0efff;
  border: solid 1px #eee;
}
#toc_container .toc_title::before {
  position: absolute;
  left: 20px;
  content: "\f0c9";
  color: #8D8D8D;
  font-family: 'Font Awesome 6 Free';
  font-size: 18px;
  font-weight: bold;
}
#toc_container .toc_title::after {
  position: absolute;
  right: 20px;
  content: "\f107";
  color: #8D8D8D;
  font-family: 'Font Awesome 6 Free';
  font-size: 18px;
  font-weight: bold;
}
#toc_container .toc_title.close::after { content: "\f106"; }
#toc_container .toc_list {
  display: none;
  list-style: disc;
  margin: 0 !important;
  padding: 35px 45px !important;
  background: #f9fcff;
  border: solid 1px #eee;
  border-top: 0;
}
#toc_container .toc_list li { margin-bottom: 30px; }
#toc_container .toc_list ol {
  list-style: none;
  margin-top: 10px;
}
#toc_container .toc_list ol li { margin-bottom: 0; }
#toc_container .toc_list ol li ol {
  margin-top: 0;
  margin-left: 30px;
}
#toc_container .toc_list ol:last-child,
#toc_container .toc_list ol li ol:last-child { margin-bottom: 0; }
#toc_container .toc_list ol li::before {
  content: "-";
  margin-right: 3px;
}
#toc_container .toc_list ol li ol li::before {
  font-family: 'Font Awesome 6 Free';
  content: "\4c";
  position: relative;
  margin-right: 3px;
  top: -4px;
  font-size: 15px;
}
#toc_container .toc_list li:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}
#toc_container .toc_number {
  color: #16c69d;
  font-family: 'ZenKakuGothicNew-B';
}
#toc_container .toc_list li a {
  text-decoration: none !important;
  overflow-wrap: anywhere;
  color: #404040 !important;
}
#toc_container .toc_list li strong { font-weight: normal; }
.pc #toc_container .toc_list li a:hover {
  text-decoration: underline !important;
  color: #105AAF !important;
  opacity: 1;
  -webkit-opacity: 1;
  -moz-opacity: 1;
  -ms-opacity: 1;
  -o-opacity: 1;
}
@media screen and (max-width: 991px){
  #toc_container { margin: 5rem 0 8rem; }
  #toc_container .toc_list{ padding: 3.5rem !important; }
}

















@media screen and (max-width: 991px){

}