@charset "utf-8";
/* 共通部分（全体） */
body,
h1,
h2,
h3,
nav,
ul,
li,
section,
p {
  padding: 0;
  margin: 0;
}
a{
  text-decoration: none;
}
/* 目次位置の調整（全体） */
section::before {
  content:'';
  display: block;
  padding-top: 40px;
  margin-top: -40px;
}
/* ヘッダー */
header {
  position: fixed;
  top: 0;
  z-index: 999;
  width: 100%;
  background-color: #000000;
  box-shadow: 0 5px 10px -6px rgba(0, 0, 0, .1);
}

.header_container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  position: relative;
}

.header_logo {
  font-size: 20px;
  font-weight: bold;
  line-height: 1.2;
  margin-right: 20px;
  letter-spacing: .05em;
}

.header_logo span {
  font-size: 20px;
}

.header_logo a {
  color: #ffffff;
  font-family:Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
  text-decoration: none;
}

.header_logo a:hover {
  opacity: 0.5;
}

.main_nav_list {
  display: flex;
  justify-content: space-between;
  list-style: none;
}

.main_nav_item {
  margin-right: 20px;
}

.main_nav_item:last-child {
  margin-right: 0px;
}

.main_nav_item a {
  position: relative;
  font-weight: bold;
  display: inline-block;
  padding: 5px 0;
  transition: .3s;
  letter-spacing: .05em;
  color: #ffffff;
  font-family:Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
  font-size: 20px;
  text-decoration: none;
}

.main_nav_item a::after {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 3px;
  content: "";
  transition: .3s;
  transform: translateX(-50%);
  background-color: #ffffff;
}

.main_nav_item a:hover {
  scale: 1.2;
}

.main_nav_item a:hover::after {
  width: 100%;
}

/* フッター */
.footer_container {
  padding: 30px;
  background-color: #000000;
  z-index: 999;
}

.copyright {
  font-size: 14px;
  text-align: center;
  color: #ffffff;
  font-family:Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
}

/* フェードインアイテムのクラス*/
.fade_item {
	opacity: 0;
	transition: all 1s;
	transform: translateY(150px);
	visibility: hidden;
}

.is-show {
	opacity: 1;
	visibility: visible;
	transform: translateY(0);
}