header {
  width: 100%;
  background-color: #ddd;
  padding: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative; 
}
h1 {
  font-size: 20px;
  font-weight: bold;
}
.gnavi__pc-style {
  margin: 0 0 0 auto;
}
.gnavi__pc-style ul {
  display: flex;
  justify-content: space-between;
}
.gnavi__pc-style ul li:not(:last-of-type) {
  margin-right: 10px;
}
 
/*ここから下がハンバーガーメニューのスタイル*/
.gnavi__sp-style {
  display: none;
}
@media screen and (max-width: 768px) {
.gnavi__pc-style {
  display: none;    
}
.gnavi__sp-style {
  display: block;
}
 
/*メニューボタン　展開前*/
.menu-btn {
  display : block;
  position: fixed;
  z-index: 3;
  right: 30px;
  top: 20px;
  width: 42px;
  height: 42px;
  cursor: pointer;
  text-align: center;
}
.menu-btn span {
  display : block;
  position: absolute;
  width: 30px;
  height: 2px ;
  left: 6px;
  background: #555;
  transition: 0.3s ease-in-out;
}
.menu-btn span:nth-of-type(1) {
  top: 10px;
}
.menu-btn span:nth-of-type(2) {
  top: 20px;
}
.menu-btn span:nth-of-type(3) {
  top: 30px;
}
   
/*メニューボタン　展開後*/
.menu-btn.active span:nth-child(1) {
  top: 16px;
  left: 6px;
  background :#fff;
  transform: rotate(-45deg);
}
.menu-btn.active span:nth-child(2),
.menu-btn.active span:nth-child(3) {
  top: 16px;
  background :#fff;
  transform: rotate(45deg);
}
 
/*スマホ用のメニュー*/
.gnavi__sp-style {
  position: fixed;
  z-index: 2;
  top: 0;
  left: 0;
  color: #fff;
  background-color: rgba(0,0,0,0.7);
  text-align: left;
  width: 100%;
  height: 100vh;
  opacity: 0;
  transition: opacity .6s ease, visibility .6s ease;
  display: flex;
  align-items: center;
  visibility: hidden;
}
.gnavi__sp-style ul {
  margin: 0 auto;
  padding: 0;
  width: 100%;
}
.gnavi__sp-style ul li {
  list-style-type: none;
  padding: 0 5%;
  width: 100%;
  transition: .4s all;
}
.gnavi__sp-style ul li:last-of-type {
  padding-bottom: 0;
}
.gnavi__sp-style ul li:hover{
  background :#ddd;
}
.gnavi__sp-style ul li a {
  display: block;
  color: #fff;
  padding: 1em 0;
  text-decoration :none;
}
.gnavi__sp-style.active {
  opacity: 1;
  visibility: visible;
}

/* ▼ サブメニュー（スマホ用） */
.gnavi__sp-style .submenu {
  display: none;
  padding-left: 10%;
  background-color: rgba(255, 255, 255, 0.1);
}

/* ▼ 開いた状態のサブメニュー */
.gnavi__sp-style .has-submenu.open .submenu {
  display: block;
}

/* ▼ サブメニューを持つ項目に矢印表示 */
.gnavi__sp-style .has-submenu > a::after {
  content: "▼";
  float: right;
  margin-right: 10px;
  font-size: 0.8em;
}

/* ▼ 開いたときの矢印切り替え */
.gnavi__sp-style .has-submenu.open > a::after {
  content: "▲";
}
}