*,
*::before,
*::after {
  box-sizing: border-box;
}
html,
body,
a,
abbr,
address,
area,
article,
aside,
audio,
b,
blockquote,
br,
button,
canvas,
caption,
cite,
code,
datalist,
del,
details,
dfn,
dd,
div,
dl,
dt,
em,
embed,
fieldset,
figcaption,
figure,
footer,
form,
header,
hgroup,
hr,
h1,
h2,
h3,
h4,
h5,
h6,
i,
iframe,
img,
input,
ins,
kbd,
label,
legend,
li,
main,
map,
mark,
menu,
meter,
nav,
object,
ol,
optgroup,
option,
output,
p,
pre,
progress,
q,
s,
samp,
section,
select,
small,
source,
span,
strong,
sub,
summary,
sup,
svg,
table,
tbody,
td,
template,
textarea,
tfoot,
th,
thead,
time,
track,
tr,
u,
ul,
var,
video {
  border: 0;
  font-size: 100%;
  margin: 0;
  padding: 0;
}
body {
  margin: 0;
}
img {
  max-width: 100%;
}
li {
  display: block;
  list-style: none;
}
#container {
  color: #000;
  font-family: '游明朝', 'Yu Mincho', YuMincho, serif;
  font-size: 14px;
  line-height: 1;
}
.wrap {
  margin: auto;
  width: 100%;
}
@media screen and (max-width: 768px) {
  .wrap {
    width: 100%;
  }
}

/* mv */

.mv {
  background: linear-gradient(180deg, #E7E4DD 260px, #fff 260px);
  position: relative;
}
.mv .wrap {
  position: relative;
}
.mv .head {
  width: 92.7%;
  margin-inline: auto 0;
  padding-bottom: 52px;
  padding-left: 50px;
  position: relative;
}
.mv .head::after {
  border-right: 1px solid #555;
  content: '';
  display: block;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
}
.mv .head h1 {
  color: #052850;
  font-size: 40px;
  font-weight: 600;
  margin-bottom: 1em;
}
.mv .head p {
  font-size: 16px;
  line-height: 1.5;
}
@media screen and (max-width: 768px) {
  .mv .head {
    border: 0;
    padding-bottom: 28px;
    padding-inline: 5vw;
  }
  .mv .head h1 {
    font-size: clamp(30px,7vw,40px);
    margin-bottom: .5em;
  }
  .mv .head p {
    font-size: 14px;
  }
}

/* alter */

.alter {
  margin-bottom: 10%;
  position: relative;
}
.alter:last-of-type {
  margin-bottom: 15%;
}
.alter::after {
  border-top: 1px solid #555;
  content: '';
  display: block;
  height: 0;
  left: 0;
  position: absolute;
  top: 0;
  width: 100%;
}
.alter .wrap {
  padding-top: 108px;
  padding-left: 50px;
  width: 92.7%;
  margin-inline: auto 0;
  position: relative;
}
.alter .wrap::after {
  border-right: 1px solid #555;
  content: '';
  display: block;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
}
.alter .flex {
  align-items: flex-start;
  display: flex;
  justify-content: space-between;
  position: relative;
}
.alter .image {
  margin-top: 50px;
  width: 49%;
}
.alter .text {
  line-height: 1.5;
  padding-left: 50px;
  width: 48%;
}
.alter .text .title {
  font-size: 16px;
  font-weight: 400;
  margin-bottom: .75em;
}
.alter .text h2 {
  font-size: 40px;
  font-weight: 600;
  margin-bottom: .75em;
}
.alter .text p {
  font-size: 16px;
  font-weight: 400;
  margin-bottom: 1.25em;
}
.alter .text h3 {
  font-size: 24px;
  font-weight: 500;
  margin-bottom: .75em;
}
.alter .text hr {
  border-bottom: 1px solid #555;
  font-size: 16px;
  margin-bottom: 1.25em;
}
.alter .text .button {
  margin-top: 54px;
}
.alter .text .button a {
  border: 1px solid #555;
  color: #000;
  display: inline-block;
  padding: .5em 1.25em .5em 2em;
  text-decoration: none;
  transition: all 0.2s;
}
.alter .text .button a:hover {
  color: #fff;
  background-color: #555;
}
.alter:nth-child(1) {
  background: linear-gradient(180deg, #E7E4DD 36%, #fff 36%);
}
.alter:nth-child(even) .wrap {
  margin-inline: 0 auto;
  padding-left: 0;
  padding-right: 50px;
}
.alter:nth-child(even) .wrap::after {
  height: 110%;
  top: auto;
  bottom: 0;
  left: auto;
  right: 0;
}
.alter:nth-child(odd) .flex {
  left: 0;
}
.alter:nth-child(odd) .image {
  order: 1;
}
.alter:nth-child(odd) .text {
  padding-left: 0;
  padding-right: 50px;
  order: 0;
}
@media screen and (max-width: 1100px) {
  .alter {
    margin-bottom: 14%;
  }
  .alter .wrap {
    padding-top: 66px;
  }
  .alter .flex {
    flex-direction: column;
  }
  .alter:nth-child(odd) .image {
    order: 0;
  }
  .alter .image {
    margin: 0 0 30px;
    width: 100%;
    aspect-ratio: 4/3;
    overflow: hidden;
  }
  .alter .image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
  }
  .alter .text {
    width: 100%;
  }
  .alter:nth-child(odd) .text {
    padding-right: 7vw;
  }
  .alter:nth-child(even) .wrap::after {
    height: 105%;
  }
}
@media screen and (max-width: 768px) {
  .alter .wrap {
    padding-bottom: 0;
    padding-top: 8vw;
    padding-left: 5vw;
  }
  .alter:nth-child(even) .wrap {
    padding-right: 5vw;
  }
  .alter .flex {
    flex-direction: column;
    left: 0;
    padding-bottom: 0;
    width: 100%;
  }
  .alter .image {
    margin: 0 0 30px;
    position: relative;
    width: 100%;
  }
  .alter .text {
    width: 100%;
  }
  .alter .text .title {
    font-size: 16px;
    font-weight: 400;
    margin-bottom: .75em;
  }
  .alter .text h2 {
    font-size: 30px;
  }
  .alter .text p {
    font-size: 14px;
  }
  .alter .text h3 {
    font-size: 20px;
  }
  .alter .text hr {
    font-size: 14px;
  }
  .alter:nth-child(odd) .flex,
  .alter:nth-child(even) .flex {
    left: 0;
  }
  .alter:nth-child(odd) .text,
  .alter:nth-child(even) .text {
    order: 1;
  }
  .alter:nth-child(odd) .image,
  .alter:nth-child(even) .image {
    order: 0;
  }
  .alter:nth-child(1) {
    background: linear-gradient(180deg, #E7E4DD 45%, #fff 45%);
  }
}