html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
margin: 0;
padding: 0;
border: none;
font-style: normal;
text-align: left;
zoom: 1;
}
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
}
table {
border-collapse: collapse;
}
h1,h2,h3,h4,h5 {
font-size: 100%;
font-weight: normal;
line-height: 1;
}
input,textarea,select {
font-size: 16px;
}
input[type=
],input[type=
],input[type=
] {
-webkit-appearance: none;
border-radius: 0;
}
textarea {
resize: none;
-webkit-appearance: none;
border-radius: 0;
}
th,td {
border-collapse: collapse;
}
table th,table td {
white-space: wrap;
}
ul,ol {
list-style-type: none;
}
img {
vertical-align: text-bottom;
vertical-align: -webkit-baseline-middle;
max-width: 100%;
height: auto;
width: auto;
}

* {
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  background-color: transparent;
  background-image: none;
  background-position: 0 0;
  background-repeat: no-repeat;
  text-decoration: none;
  text-indent: 0;
  text-transform: none;
  font-style: normal;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
  color: inherit;
}
:root {
  --textcolor: #141414;
  --mainback: hsl(206, 78%, 69%);
  --subback: hsl(198, 61%, 82%);
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
  font-family: 'Kaisei Opti', serif;
}
body {
  box-sizing: border-box;
  color: #000000;
  width: 100%;
  height: 100vh;
}
.content {
  overflow-y: hidden;
}
main {
}
a {
  text-decoration: none;
  color: #000;
}
li {
  list-style: none;
}
p {
  font-size: clamp(1rem, 2vw + 1rem, 1.25rem);
  margin: 0;
  padding: 0;
}
img {
  width: 100%;
  height: auto;
  vertical-align: middle;
  line-height: 1;
  object-fit: cover;
}
@media screen and (min-width: 420px) {
  .br-sp {
    display: none;
  }
}
a:hover {}

/* header */
.site-header {
  display: flex;
  justify-content: start;
  position: fixed;
  top: 0;
  transition: .5s;
  width: 100%;
  z-index: 99;
  background-color: rgb(255 255 255 / 30%);
}
.site-header.hide {
  top: -82px;
}
.site-logo img {
  height: 20px;
  width: auto;
}
.gnav__menu {
  display: flex;
}
.gnav__menu__item {
  margin-left: 20px;
}
.site-header .gnav__menu__item a {
  color: #333;
  text-decoration: none;
}
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  left: 0;
  right: 0;
  height: 50px;
  width: 100%;
}
.top_logo {
  object-fit: contain;
  height: auto;
  width: clamp(100px, 10px, 150px);
  margin-right: 1em;
}
.top_logo img {
  width: 100%;
  height: 100%;
  margin: 0 15px;
}
.top_menu {
  margin-right: 5%;
}
.top_menu ul {
  display: flex;
}

@media screen and (max-width: 768px) {
  .top_menu ul {
    display: none;
  }
}
.top_menu li {
  padding: 0px 10px;
}
/*menu */
.menu a {
  position: relative;
  display: inline-block;
  font-size: 20px;
  font-weight: 300;
  color: #666;
  transition: color .2s ease;
  padding: 3px 0;
  text-decoration: none;
  font-weight: 600;
}
.menu a:hover {
  color: #ffffff;

}
.menu a:hover::after,
.menu a:hover::before {
  width: 100%;
  left: 0;
}
.menu a::after,
.menu a::before {
  content: '';
  position: absolute;
  top: calc(100% + 0px);
  width: 0;
  right: 0;
  height: 3px;
}
.menu a::before {
  transition: width .4s cubic-bezier(0.51, 0.18, 0, 0.88) .1s;
  background: #2196f3;
}
.menu a::after {
  transition: width .2s cubic-bezier(0.29, 0.18, 0.26, 0.83);
  background: #F44336;
}
/* Humberger Menu */
nav {
  display: block;
  position: fixed;
  background-color: #ffffff;
  width: 220px;
  top: 0;
  left: -300px;
  bottom: 0;
  transition: all 0.5s;
  z-index: 3;
  opacity: 0;
}
.open nav {
  left: 0;
  opacity: 1;
}
nav .inner {
  padding: 25px;
}
nav .inner ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
nav .inner ul li {
  margin: 0;
}
nav .inner ul li a {
  display: block;
  color: #333;
  font-size: 16px;
  padding: 1rem;
  text-decoration: none;
  transition-duration: 0.2s;
}
nav .inner ul li a:hover {
  background: #e4e4e4;
}
.toggle-btn {
  display: block;
  position: absolute;
  top: 10px;
  right: 2%;
  width: 30px;
  height: 30px;
  z-index: 3;
  cursor: pointer;
  opacity: 0.6;
}
.toggle-btn span {
  position: absolute;
  display: block;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: #666;
  transition: all 0.5s;
  border-radius: 4px;
}
.toggle-btn span:nth-child(1) {
  top: 4px;
}
.toggle-btn span:nth-child(2) {
  top: 14px;
}
.toggle-btn span:nth-child(3) {
  bottom: 4px;
}
.open .toggle-btn span {
  background-color: #fff;
}
.open .toggle-btn span:nth-child(1) {
  transform: translateY(10px) rotate(-315deg);
}
.open .toggle-btn span:nth-child(2) {
  opacity: 0;
}
.open .toggle-btn span:nth-child(3) {
  transform: translateY(-10px) rotate(315deg);
}
#mask {
  display: none;
  transition: all 0.5s;
}
.open #mask {
  display: block;
  background: #000;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  position: fixed;
  opacity: 0.8;
  z-index: 2;
  cursor: pointer;
}
@media only screen and (min-width: 576px) {
  section h3 {
    line-height: 1;
  }
}
/* ============== h1タグ（非表示・SEO対策） ============== */
.maintitle {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}