/*body and main*/
body {
  min-width: 500px;
  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAYAAABWdVznAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAACFJREFUeNpiZGBg4GegAsBlCD8TqSYNQg2Mo6FEBAAIMACdPABtrSW/IQAAAABJRU5ErkJggg==);
}

main {
  max-width: 1000px;
  margin: auto;
  padding: 1em;
  line-height: 1.5;
}

footer, .main-page {
  box-shadow: #0000001f 0 2px 2px,#0000000f 0 3px 1px -2px,#0000001f 0 1px 5px,#00000017 0 -1px .5px;
  padding: 20px 25px 20px;
  background: #fff;
}

.main-page {
  position:relative;
}

@media (min-width: 800px) { 
 .main-page {
    padding: 20px 50px 20px;
  }
}

/* header and footer areas */
.menu { 
  padding: 0;
  justify-content: center; 
}

.menu a {
  text-decoration: none;
  padding: 5px;
}

.menu-wrap,.menu-link,.menu-icon {
  opacity: .8;
  filter: alpha(opacity=80);
  text-shadow: 0 1px #0003;
  padding: 20px 15px;
  text-decoration: none;
  -o-transition: opacity .2s;
  transition: opacity .2s;
  display: block
}

.menu-wrap {
  padding: 0 15px;
  -o-transition: all .3s ease;
  transition: all .3s;
  display: inline-flex;
}

.menu-wrap:hover {
  opacity: 1;
  -ms-filter: none;
  filter: none;
}

.menu-wrap:hover .menu-icon {
  -webkit-transition: -webkit-transform 1s;
  -o-transition: -o-transform 1s ease;
  -moz-transition: -moz-transform 1s;
  -ms-transition: -ms-transform 1s;
  transition: transform 1s;
  transform: rotate(360deg)
}

.menu-wrap:hover .menu-link {
  color: #FD3D33;
}

.menu-link {
  letter-spacing: 1px;
  font-weight: 400;
  color: #000;
}

.menu-icon {
  background: url("../image/taichi.png") 50%/80% no-repeat;
  -webkit-transition: -webkit-transform 1s;
  -o-transition: -o-transform 1s ease;
  -moz-transition: -moz-transform 1s;
  -ms-transition: -ms-transform 1s;
  transition: transform 1s;
  transform: rotate(0);
}

.article-meta {
  text-decoration: none;
  padding: 5px;
}

.article-meta hr {
  border-style: dashed;
  color: #ddd;
}

.terms { font-size: 1.1em; }
.terms a{ 
  margin: 0 2px;
  font-size: .9em;
  text-decoration: underline;
  color: #181aa3;
}
.terms a:hover {
    color: #FD3D33;
}
.menu, .article-meta, footer { text-align: center; }
.title { font-size: 1.1em; }
footer { 
  margin-top: 30px;
  line-height: 1.7;
}
footer a { 
  text-decoration: underline;
  color: #000;
}
footer a:hover {
    color: #FD3D33;
}
hr {
  border-style: dashed;
  color: #ddd;
}

/* misc elements */

img, iframe, video { max-width: 100%; }
.content { 
  hyphens: auto; 
  min-height: 500px;
}
.content-back-image {
  user-select: none;
  -webkit-user-drag: none;
  opacity: 0.2;
  width: 500px;
  height: 500px;
  position: absolute;
  right: 0;
  margin-top: -400px;
}
.content-last-time {
  text-align: right;
  color: #6d6d6d;
}
blockquote {
  background: #f9f9f9;
  border-left: 5px solid #ccc;
  padding: 3px 1em 3px;
}
.katex-display {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  vertical-align: middle;
}
table {
  margin: auto;
  border-top: 1px solid #666;
  border-bottom: 1px solid #666;
}
table thead th { border-bottom: 1px solid #ddd; }
th, td { padding: 5px; }
thead, tfoot, tr:nth-child(even) { background: #eee; }

.pagination {
  display: flex;
  flex-direction: row;
  justify-content: center;
  list-style: none;
  white-space: nowrap;
  width: 100%;
  padding: 1rem 0 0;
}

.pagination a {
  font-size: 24px;
  color: #bfbfbf;
  letter-spacing: .1rem;
  font-weight: 700;
  padding: 5px 5px;
  text-decoration: none;
  -webkit-transition: 0.3s;
  -moz-transition: 0.3s;
  -o-transition: 0.3s;
  transition: 0.3s;
}

.pagination li {
  padding-bottom: 3px;
  margin: 0 10px;
  box-sizing: border-box;
  position: relative;
  display: inline;
}

.pagination li.disabled {
  display: none;
}

.pagination li:hover a {
  color: #000;
}

.pagination li:before, .pagination li:after {
  position: absolute;
  content: "";
  width: 0;
  height: 3px;
  background: #000;
  -webkit-transition: 0.3s;
  -moz-transition: 0.3s;
  -o-transition: 0.3s;
  transition: 0.3s;
  bottom: 0px;
}

.pagination li:before .active, .pagination li:after .active {
  width: 100%;
}

.pagination li:before {
  left: 50%;
}

.pagination li:after {
  right: 50%;
}

.pagination li:hover:before, .pagination li:hover:after {
  width: 50%;
}

.pagination li.active a {
  color: #000;
}

.pagination li.active:before, .pagination li.active:after {
  width: 60%;
}

.index-list-wrap{
  margin: 1rem 0;
  border-bottom: 1px solid lightgray;
  padding: .5rem 0;
  content-visibility: auto;
  display: block;
}

.index-list-title{
    font-size: 150%;
    color: #2f2f2f;
    text-decoration: none;
    font-weight: 600;
    margin: 2px 4px;
}

.index-list-date{
  color: #6d6d6d;
  margin-right: .5em;
}

.index-list-summary{
    margin: 15px 0 26px 8px;
    color: #383838;
    border-left: 4px solid #ddd;
    color: var(--blockquote-color);
    padding: 0 0 0 11px;
}

.index-list-readmore{
    font-size: 90%;
    margin: 0 4px;
    color: #6d6d6d;
    user-select: none;
    text-decoration: none;
}

@keyframes rotate-all {
    to {
        transform: rotate(360deg)
    }
}

/*sidebar and toc*/

.sidebar {
  white-space: nowrap;
}

aside#sidebar {
    align-self: flex-start;
    position: sticky;
    top: 30px;
}

.sidebar-top {
    /* display: none; */
    opacity: 0;
    background-color: #fff;
    z-index: 999;
    -o-transition: all .3s ease;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-family: "Font Awesome 6 Free","Font Awesome 6 Brands","Font Awesome 5 Free","Font Awesome 5 Brands",FontAwesome;
    transition: all .3s;
    position: fixed;
    bottom: 30px;
    right: 30px;
    box-shadow: 1px 2px 10px #0003
}

.sidebar-top img {
    -o-transition: all .3s ease;
    -ms-animation: rotate-all 3s infinite;
    -ms-animation-timing-function: linear;
    opacity: 1;
    -ms-filter: none;
    filter: none;
    transition: all .3s;
    animation: 3s linear infinite rotate-all
}

.sidebar-top .arrow-up {
    -o-transition: all .3s ease;
    opacity: 0;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
    filter: alpha(opacity=0);
    transition: all .3s
}

.sidebar-top .arrow-up:before {
    content: "";
    color: #ff5252;
    text-align: center;
    width: 50px;
    height: 50px;
    font-size: 20px;
    line-height: 50px;
    position: absolute;
    top: 0
}

.sidebar-top:hover img {
    opacity: 0;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
    filter: alpha(opacity=0)
}

.sidebar-top:hover .arrow-up {
    opacity: 1;
    -ms-filter: none;
    filter: none
}

.avatar {
  user-select: none;
  border: 1px solid #eee;
  border-radius: 50%;
  display: block;
  margin: auto;
  -webkit-transition: -webkit-transform 1s;
  -o-transition: -o-transform 1s ease;
  -moz-transition: -moz-transform 1s;
  -ms-transition: -ms-transform 1s;
  transition: transform 1s;
  transform: rotate(0);
}

.avatar:hover {
  -webkit-transition: -webkit-transform 1s;
  -o-transition: -o-transform 1s ease;
  -moz-transition: -moz-transform 1s;
  -ms-transition: -ms-transform 1s;
  transition: transform 1s;
  transform: rotate(360deg)
}

.sidebar-list {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  grid-gap: 10px;
}

.toc {
    position: fixed;
    top: 0% ;
    margin-top: 100px;
    margin-right: -245px;
    height: 60%;
    right: 0;
    width: 250px;
    overflow-x: hidden;
    overflow-y: auto;
    background-color: #fff;
    border: solid 1px #c9c9c9;
    border-radius: 5px;
    padding-left: 10px;
    padding-right: 10px;
    padding-bottom: 1rem;
    transition: margin-Right .5s;
}

.toc::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.toc::-webkit-scrollbar-thumb {
  background: #CCCCCC;
  border-radius: 6px;
}

.toc::-webkit-scrollbar-track {
  background: transparent;
}

.toc .page-header {
    text-align: center;
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.toc-nav {
  text-align: left;
}

.toc-nav ul {
    list-style-type:none;
    white-space:nowrap;
    line-height: 1rem;
}

/* ignore h1 header */
.toc-nav ul ul ul {
    margin-left: 2rem;
}

.nav {
  padding-left: 1em;
}

.toc-nav .nav-link {
    text-overflow:ellipsis;
    overflow:hidden;
    color: #333;
}

.toc-nav li.active .nav-link {
    background-color: #f6f6f6;
    color: #333;
    border-left: solid 2px #333;
}

/*friend*/
.friends {
  display: grid;
  justify-content: center;
  grid-template-columns: repeat(auto-fit,minmax(35ch,1fr));
  gap: 1em;
  padding: 0;
}
.friends-card {
  text-align: left;
  display: flex;
  padding: 2.5px;
  background-color: #fff;
  background-size: 400%;
  border-radius: .5rem;
  background-position: 100%;
  transition: all .3s;
  box-shadow: 0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a;
}

.friends-card:hover {
  transform: scale(1.015);
  box-shadow: 0 0 20px 5px #0000001a;
}

.friends-url{
  width: 100%;
  text-decoration: none;
  line-height: 1.4;
  padding: 1rem 1.3rem;
  border-radius: .35rem;
  color: #111;
  background-color: #fff;
  opacity: .8;
}

.friends-board {
  display: grid;
  grid-template-areas: 
  "title title title title avatar"
  "link  link  link  link  avatar"
  "main main main main main"
  "main main main main main"
  "main main main main main";
  gap: .35rem;
  padding: .1rem;
  justify-content: space-between;
}

.friends-title {
  grid-area: title;
}

.friends-avatar {
  height: 100px;
  width: 100px;
  border-radius: 50%;
  border: solid #44444466 1px;
}

.friends-link {
  grid-area: link;
}

.friends-link span {
  font-size: .875em;
  font-weight: 700;
  background: rgba(255, 96, 96,12%);
  color: rgb(255, 96, 96);
  border-radius: 4px;
  padding: .3em .45em;
}

.friends-main {
  grid-area: main;
  line-height: 1.8em;
  margin: .5em 6px;
}