:root {
  --light-color: #c9eeee;
  --middle-color: #497508;
  --dark-color: #003503;
}

body {
  background-color: #ffffff;
  background-position: right bottom; 
  background-repeat: repeat;
  background-attachment: fixed;
	background-size: auto 60%;
}

h1{
	width: 100%;
	font-weight: bold;
	padding: 15px;
	background: #c9edd0;
	color: var(--dark-color);
	margin-bottom:20px;
}
h1 > span.sub{
	margin-left: 30px;
	font-size: 0.7em;
	color: var(--middle-color);
}
h1 > span.eng{
	margin-left: 20px;
	font-weight: normal;
	font-size: 0.5em;
	color: var(--middle-color);
}

h2{
	display: block;
}
h2 > div{
	font-weight: bold;
	padding: 5px 10px;
	border: solid 1px var(--middle-color);
	border-left: solid 10px var(--middle-color);
	width: 100%;
	color: var(--dark-color);
	margin: 25px 0 10px;;
}
div.desc{
	background-color: var(--light-color);
	padding: 0.9rem;
	margin-bottom: 10px;
	border-radius: 10px;
}
div.desc > p,
div.desc > ul {
	margin: 0;
}

h3{
	color: var(--dark-color);
	font-weight: normal;
	background: #c9edd0;
	background-size: 24px 24px;
	background-repeat: no-repeat;
	background-image: url('/tetris/mutual/img/z-icon.png');
	background-position: 5px;
	box-sizing: border-box;
	padding: 6px 0px 5px 36px;
	width: 100%;
	margin: 15px 0px 5px;
}

h4{
	color: var(--dark-color);
	font-weight: normal;
	background-size: 20px 20px;
	background-repeat: no-repeat;
	background-image: url('/tetris/mutual/img/s-icon.png');
	background-position: 5px;
	box-sizing: border-box;
	padding: 4px 0px 4px 28px;
	margin: 2px auto 0px;
  border-bottom: solid 0.1rem #c9edd0;
}
div.h4talk{
	width: 96%;
	margin: 0px auto 12px;
	background: var(--light-color);
	padding: 0.5px 8px 0.5px 12px;
	border-radius: 10px;
}
div.h4talk p{
	font-size: 1.4rem;/* 14px*/
}
div.h4talk hr{
	height: 5px;
	width: calc(100% - 10px);
	margin: 0px 10px 5px 0px;
	background: var(--light-color);
	border: none;
	border-radius: 3px;
}

h5{
	color: #000000;
	background-color:#c9edd0;
	padding: 8px 0px 8px 16px;
	margin: 10px auto 0px;
	box-sizing: border-box;
	border-left: solid 10px var(--middle-color);
	width: 96%;
}
h4.h2a{
	background-color: var(--middle-color);
	padding: 6px 0 6px 28px;
	color: #eefff6;
	margin-top: 2.0rem;
}

.main ul{
	list-style: circle;
	padding-left: 30px;
	margin-bottom: 15px;
}
.main li{
	font-size: 1.6rem;/* 16px*/
	margin: 0.7rem 0;
}
@media screen and (max-width: 640px) {
	.main li{
		margin: 0.1rem 0;
	}
}
.main li.dkj{
	list-style-type: square;
}

.side ul{
	padding-bottom: 20px;
}
.side li{
	padding: 10px 5px 5px 10px;
	border-bottom: dashed 2px var(--middle-color);
}

div.mokuji{
	width: 90%;
	margin: 20px auto;
	padding: 5px;
	border: solid 3px #bbccdd;
	color: #333333;
}
div.mokuji ul {
	margin-bottom: 0;
}
div.mokuji ul li a div{
	line-height: 1.2;
	margin-bottom: 0.6rem;
}

p {
  color: #000000;
}
@media screen and (max-width: 640px) {/* 640px以下*/
	p {
		font-family: sans-serif;
		font-size: 1.6rem;/* 16px*/
		line-height: 1.6;
		margin-bottom: 0.9rem;
	}
}

a:link {color: #e85f15; text-decoration: underline;}
a:visited {color: #440088; text-decoration: underline;}
a:hover {color: #990099; text-decoration: underline;}
a:active {color: #cc33cc; text-decoration: underline;}
.side a:link {color: #000000;}
.side a:visited {color: #333333;}

strong {
	font-weight: bold;
	background: rgba(0, 0, 0, 0) linear-gradient(transparent 30%, #ffcccc 0%) repeat scroll 0 0;
}

.flexbox {
	display: -ms-flexbox;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
	margin: 8px auto;
	padding-top: 32px;
	width: 100%;
	max-width: 1000px;
}
section {
  margin-bottom: 3.0rem;
}
.main {
	width: 100%;
	/* max-width: calc(100% - 300px); */
	padding-top: 0;
	margin: 0 auto;
	/* background: #fcc; */
}
.side {
	width: 250px;
	margin: 0 12px;
	background: #f3ffff;
}
@media screen and (max-width: 767px) {
	.flexbox {
	-ms-flex-direction: column;
		-webkit-flex-direction: column;
		flex-direction: column;
		box-sizing: border-box;
		width: 100%;
	}
	.main {
		max-width: inherit;
	}
	.side{
		width: 95%;
		margin: 9px auto;
	}
}

.nodisp {
	display: none!important;
}

.cont {
	margin: 8px;
}

.linknote {
	position: relative;
	display:block;
	margin: 15px 5px;
	padding: 32px 5px 10px 5px;
	border: solid 3px #b4f3ff;
	border-radius: 5px;
}
.linknote::before {
	display:inline-block;
	width: 100%;
	position: absolute;
	top: 0px;
	left: 0px;
	padding: 1px 5px 5px 5px;
	font-size: 16px;
	content: "関連記事はこちら!!";
	display: block;
	background: #b4f3ff;
}
@media screen and (max-width: 640px) {/* 640px以下*/
	.linknote {
		padding: 27px 5px 10px 5px;
	}
	.linknote::before {
	font-size: 14px;
	top: -2px;
	padding: 1px 5px 1px 5px;
	}
}

.proficon {
	margin: 5px;
	width: 100%;
}
.proficon img{
	width: 120px;
}

/* ページトップボタン */
#page_top{
  width: 50px;
  height: 50px;
  position: fixed;
  right: 20px;
  bottom: 20px;
  background: #087777;
  opacity: 0.6;
  border-radius: 50%;
}
#page_top a{
  position: relative;
  display: block;
  width: 50px;
  height: 50px;
  text-decoration: none;
}
#page_top a::before{
  font-family: 'Font Awesome 5 Free';
  font-weight: 900;
  content: '↑';
  font-size: 25px;
  color: #ffffff;
  position: absolute;
  width: 25px;
  height: 25px;
  top: -5px;
  bottom: 0;
  right: 0;
  left: 0;
  margin: auto;
  text-align: center;
}
@media screen and (max-width: 640px) {/* 640px以下*/
  #page_top a::before{
    top: -15px;
  }
}
#page_top:hover {
  text-decoration: none;
  opacity: 0.7;
}

/* nav-bar */
nav {
  background-color: var(--light-color);
  border-color: var(--middle-color);
}
nav a.navbar-brand {
  background-image: url('/puzzle/img/logo.png');
  /* background-position: 0.5rem; */
}
@media screen and (max-width: 950px) {
  nav .nav-link {
    border-top: solid 0.1rem var(--middle-color);
  }
  nav ul.navbar-nav>li:last-child>.nav-link {
    border-bottom: solid 0.1rem var(--middle-color);
  }
}
nav .nav-link,
nav .nav-link:visited {
  color: var(--dark-color);
  text-decoration: none;
}
nav .nav-link:hover {
  color: var(--middle-color);
}
nav .navbar-toggler i {
  background-color: var(--dark-color);
}
nav .dropdown-menu {
  background-color: var(--dark-color);
}
nav.navbar-light .dropdown-menu {
  background-color: var(--light-color);
}
nav .dropdown-menu .nav-link {
  border-top: solid 0.1rem var(--middle-color);
  background: var(--light-color);
}
nav .dropdown-menu li:last-child .nav-link {
  border-bottom: solid 0.1rem var(--middle-color);
}

ol.puzzle_rule {
  margin-top: 0;
}
ol.puzzle_rule li {
  font-size: 1.4rem;
}

.puzzle_example_img {
  display: flex;
  justify-content: center;
}
.puzzle_example_img img {
  width: 40%;
  max-width: 200px;
  height: auto;
  border: solid 0.1rem #cccccc;
  margin: 1.0rem;
}
a.linkbtna, a.linkbtna:hover {
    display: block;
    width: 80%;
    max-width: 240px;
    text-decoration: none;
    margin: 0 auto;
}
.linkbtn {
  width: 100%;
  height: 4rem;
  line-height: 3.5rem;
  margin: 1.0rem auto 2.0rem;
  font-size: 2.0rem;
  border-radius: 1rem;
  text-align: center;
  background-color: #e5ffd9;
  border: solid 2px #33aa33;
  box-shadow: 0rem 0.5rem 0 #33aa33;
  color: #33aa33;
}
.linkbtn:hover {
  transform: translate3d(0rem, 0.5rem, 0);
  background-color: #f9fff2;
  box-shadow: none;
}
.detailbtn {
  background-color: #e3f3ff;
  border: solid 2px #3366dd;
  box-shadow: 0rem 0.5rem 0 #3366dd;
  color: #3366dd;
}
.linkbtn:hover {
  background-color: #f6f6ff;
}
details {
  border: 1px solid #aaa;
  border-radius: 4px;
  padding: 0.5rem 0.5rem 0;
  margin: 1rem 0;
}
details[open] summary {
    border-bottom: 1px solid #aaa;
    margin-bottom: 0.5rem;
}
summary {
  font-weight: bold;
  margin: -0.5rem -0.5rem 0;
  padding: 0.5rem;
  cursor: pointer;
  transition: 0.2s;
}

/* 一覧リスト用 */
ul.puzzle-list {
	display: flex;
	flex-wrap: wrap;
	list-style: none;
	padding-left: 0;
}

li.puzzle {
  width: 150px;
	margin: 0.5rem;
	padding: 0.5rem 1.2rem;
	border: solid 1px #333333;
	border-radius: 0.5rem;
	background: #ffffff;
}

li.puzzle label {
  margin-bottom: 0;
}
li.puzzle label input[type=checkbox] {
	transform: scale(1.6);
  margin-right: 0.6rem;
}