@media(max-width:640px)


@charset "UTF-8"

body {
  font-family: Arial,"Hiragino Kaku Gothic ProN","Hiragino Sans", Meiryo,sans-serif;
 font-size: 16px;
 color: #333;
}

a {
  text-decoration: none;
  transition: 0.3s;
}

a:hover {
  opacity: 0.8;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: bottom;
}

.container {
  max-width: 1170px;
  margin: 0 auto;
  padding: 0 30px;
}

.header {
  padding: 50px 0;
}

.header .logo {
  width: 280px;
  margin: 0 auto;
}

.demo {
  text-align: center;
}

.main-visual {
  text-align: center;
}

.global-nav {
  padding: 40px 0;
}

.global-nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
}

.global-nav ul li {
  font-size: 18px;
  line-height: 1;
  letter-spacing: 0.1em;
  margin-right: 80px;
}

.global-nav ul li:last-child {
  margin-right: 0;
}

.concept {
  padding: 50px 0;
}

.concept  .container {
  display: flex;
  align-items: center;
}

.concept .img {
  width: 50%;
}

.concept .desc {
  width: 50%;
  padding-right: 20px;
  padding-left: 40px;
}

.concept .subtitle {
  font-size: 16px;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.concept .title {
  font-size: 32px;
  font-weight: bold;
  line-height: 1.5;
  letter-spacing: 0.1em;
  color: #24a8bf;
  margin-bottom: 30px;
}

.concept .text p {
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0.1em;
}

.blog {
  padding: 50px 0;
}

.blog .heading {
  font-size: 32px;
  font-weight: bold;
  line-height: 1;
  letter-spacing: 0.08em;
  color: #24a8bf;
  text-align: center;
  margin-bottom: 30px;
}

.blog .subtitle {
  display: block;
  font-size: 13px;
  line-height: 1;
  letter-spacing: 0.03em;
  color:#333;
  margin-top: 8px;
}

.blog .list {
  display: flex;
  flex-flow: wrap;
}

.blog .list .item {
  width: calc((100% - 60px) / 3);
  margin-right: 30px;
  margin-bottom: 30px;
}

.blog .list .item:nth-child(3n) {
  margin-right: 0;
}

.blog .list .item:hover {
  opacity: 0.8;
}

.blog .list .title {
  font-size: 15px;
  line-height: 1.6;
  font-weight: bold;
}

.blog .list .date {
  font-size: 12px;
  margin-top: 6px;
}

.btn {
  display: block;
  position: relative;
  width: 220px;
  font-size: 15px;
  color: #24a8bf;
  line-height: 1;
  text-align: center;
  margin: 0 auto;
  padding: 18px 0;
  transition: opacity 0.3s;
  border: 1px solid #24a8bf;
  border-radius: 3px;
}

.btn::after {
  display: block;
  content: "";
  position: absolute;
  top: 50%;
  right: 1em;
  width: 5px;
  height: 9px;
  transform: translateY(-50%);
  background-image: url("./image/icon_arrow-right.png");
  background-repeat: no-repeat;
  background-size: 5px 9px;
}

.footer .copyright {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: #8b8b8b;
  text-align: center;
}