@charset "utf-8";
html {
  font-size: 6.25%;
  overflow-x: hidden;
	scroll-behavior: smooth;
}
body {
	position: relative;
	min-width: 1120px;
	margin: 0 auto;
  background-color: #F5F5F5;
  color: #253757;
  font-family: "Noto Sans JP", sans-serif;
  font-size: 16rem;
  line-height: 1.7;
  letter-spacing: .06em;
  word-wrap: break-word;
  overflow-wrap: break-word;
	text-align: justify;
	text-justify: inter-ideograph;
  text-size-adjust: 100%;
  -moz-osx-font-smoothing: unset;
  -webkit-font-smoothing: subpixel-antialiased;
  -webkit-text-size-adjust: 100%;
}
img {
  max-width: 100%;
  height: auto;
}
.pcno {
  display: none;
}
.spl {
  padding-left: 1em;
}
.spr {
  padding-right: 1em;
}
/*カラー*/
.red{color: #FF0000;}
.blue{color: #00CCFF;}
.yellow{color: #FFFF00;}
.Bkred{background: #FF0000;color:#fff;}
.Bkblue{background: #00CCFF; color:#222;}
.Bkyellow{background: #FFFF00; color:#222;}

@media screen and (max-width: 767px) {
  body {
    min-width: auto;
    font-size: 15rem;
  }
  .pcno {
    display: inherit;
  }
  .spno {
    display: none;
  }
	.spl {
		padding-left: 0;
	}
	.spr {
		padding-right: 0;
	}
}

/**--- Container---**/
main {
	width: 100%;
  margin: 0 auto;
  position: relative;
}
section {
  padding: 6vh 1em;
}
.contener {
	max-width: 1120px;
	width: 100%;
  margin: 0 auto;
}
.imgBox {
	margin-bottom: 2em;
	text-align: center;
}
.LinkBox {
	text-align: center;
}
.LinkBox .btn {
	margin: 0 auto;
}

/**--- Font ---**/
h1 {
  margin-bottom: .5em;
  font-size: clamp(22rem, 2.23vw, 35rem);
  font-weight: 700;
}
h2 {
  margin-bottom: 1.5em;
  font-size: clamp(20rem, 2.14vw, 28rem);
  font-weight: 700;
	line-height: 1.5;
}
p {
  margin-bottom: 1.5em;
  font-size: 1em;
}
.min {
	font-size:.85em;
}
.note {
  padding-left: 1em;
  text-indent: -1em;
}
.contTtl {
	width: fit-content;
	margin: 0 auto 1.5em;
  padding: 0 0 .4em;
  border-radius: 10px;
  color: #25376b;
	text-align: center;
  line-height: 1.4;
	position: relative;
}
.contTtl::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, #0770da 0%, #13b88e 100%);
}
.colorinfo {
	padding: 0 .5em .2em;
	line-height:1.8;
	border: 1px solid #fff;
	border-radius: 5px;
}

/*Link*/
.fade{
	transition: opacity .7s ease-out;
}
.fade:hover { opacity:.7;}
.txtLink {text-decoration: underline;}
.btn {
	position: relative;
  display: flex;
	flex-direction: column;
	justify-content: center;
  align-items: center;
	flex-wrap: wrap;
	width: fit-content;
	margin: 0 auto;
  padding: 0.2em 3em 0.2em 2em;
	color: #0770DA;
	font-size: clamp(16rem, 1.51vw, 18rem);
	font-weight:700;
	line-height: 2.4;
	letter-spacing: 0.02em;
  border: 1px solid #0770DA;
  background: #fff;
  border-radius: 20px;
  transition: .3s;
}
.btn small {
	display: block;
	width: 100%;
	font-size: 1em;
	font-weight:500;
	text-align: center;
	border-top: 2px dotted #0770DA;
}
.btn:hover,
.btn.active{
	color: #fff;
  background-color: #0770DA;
}
.btn:hover small,
.btn.active small{
	border-top: 2px dotted #fff;
}
.btn::after {
	content: "";
  position: absolute;
  top: 50%;
  right: 1em;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  background: url(../img/icon_arrow.svg) no-repeat center center /cover;
}
.btn:hover::after,
.btn.active::after{
	content: "";
  position: absolute;
  top: 50%;
  right: 1em;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  background: url(../img/icon_arrow_hover.svg) no-repeat center center /cover;
}

/**--- heade ---**/
header {
	position: absolute;
	top: 0;
	left: 50%;
	max-width: 1120px;
	width: 90%;
	transform: translateX(-50%);
	z-index: 10;
}

/**--- footer ---**/
footer {
	padding: 1em 0 2em; 
	text-align: center;
}
footer address{
	padding: 1.5em 0;
}
footer .copyright{
	margin-bottom: 0;
	font-size: 12rem;
}

/**--- TOP ---**/
.average ul{
	display: flex;
	justify-content: center;
}
.average li{
	padding: 0 1em;
	margin-bottom: 1em;
}
.average .back{
	margin-top: 2em;
}
.linkList .row{
	--bs-gutter-x: 1%;
  --bs-gutter-y: 2%;
}
.linkList .row li{
	text-align:center;
}
.linkList .row li img{
	border:1px solid #e1e1e1;
}
@media screen and (max-width: 767px) {
	.average ul{
		flex-wrap: wrap;
	}
	#top .average li .btn{
		width: 17em;
	}
}
@media screen and (max-width: 480px) {
	.info .align_r {
		text-align: left !important;
	}
}

/**--- 観測値 ---**/
.bkheadline {
	position: relative;
	padding-top: 2em;
	text-align: center;
	overflow: hidden;
}
.bkheadline .contener {
	position: relative;
	z-index: 2;
}
.bkheadline h1 span{
	padding-right: 1em;
}
.concentration {
	max-width: 800px;
	width: 90%;
	margin: 0 auto;
	padding: 2em 3em;
	color: #222222;
	background: #fff;
	border-radius: 20px;
}
.concentration h2 {
	margin-bottom: 0;
}
.concentration .day {
	margin-bottom: 0.5em;
	font-size: clamp(16rem, 1.62vw, 20rem);
	font-weight: 700;
	text-align: center;
}
.concentration .data {
	padding: 2em;
	text-align: center;
	border-radius: 20px;
}
.concentration .ppb {
	margin-bottom: 0;
	font-size: clamp(80rem, 10.26vw, 150rem);
	font-weight: 900;
	line-height: 1;
}
.concentration .ppb small{
	font-size: .5em;
}
.concentration ul{
	margin: 1em 0;
	text-align: left;
}
.concentration li{
	margin-bottom: .5em;
	padding-left: 2.5em;
  text-indent: -2.5em;
}
.concentration li span{
	margin-right: .5em;
}
.history {
	max-width: 600px;
	width:100%;
	margin: 0 auto;
	border-top: 1px solid #d7d7d7;
}
.history tr:nth-child(even){
  background: #fff;
}
.history th, 
.history td {
	width: calc(100% / 3);
	padding:1.2em 1em;
	font-weight: 400;
	text-align: center;
	border-bottom: 1px solid #d7d7d7;
}
@media screen and (max-width: 767px) {
	.bkheadline h1 span{
		padding-right: 0;
	}
}
@media screen and (max-width: 480px) {
	.concentration {
		padding: 2em;
	}	
}