.main-menu {
  float: right;
  text-align: right;
  position: relative;
  padding: 25px 0 0;
}

.main-nav {
  display: flex;
  justify-content: flex-end;
}
.main-nav li {
  position: relative;
  list-style: none;
  margin: 0 30px 0;

  font-size: 1.6rem;
  color: #1b1b1b;
}

.main-nav a {
  display: inline-block;
  padding: 8px 12px;
  line-height: 1; /* 高さがずれにくくなる */
  transition: background-color 0.3s; /* 背景色だけアニメーションさせたい場合 */
  vertical-align: middle;
  text-decoration: none;
  color: #1b1b1b;
}

.main-nav a:hover {
  background-color: rgba(0, 0, 0, 0.05); /* 任意のホバー背景色 */
}

/* サブメニューを初期は非表示 */
.main-nav .dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: white;
  min-width: 180px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  z-index: 999;
}

/* ドロップダウン内リンクスタイル */
.main-nav .dropdown-menu li {
  margin: 0;
}

.main-nav .dropdown-menu a {
  padding: 10px 15px;
  color: #1b1b1b;
  white-space: nowrap;
}

.main-nav .dropdown-menu a:hover {
  background-color: #f0f8ff;
  color: #007bbd;
}

/* ▼ホバー時にドロップダウンを表示 */
.main-nav li.dropdown:hover .dropdown-menu {
  display: block;
}
.main-nav a:hover,
.main-nav .current {
  color: #1b1b1b;
  border-bottom: 2px solid #1b1b1b;
  padding-bottom: .5rem;
  background: none;
}
.main-nav a::before {
  content: '';
}

@media screen and (min-width: 0px) and (max-width: 1345px) {
  .main-nav li {
      margin:0 10px 0;
}
}

@media screen and (min-width: 0px) and (max-width: 1105px) {
.main-nav li {
    margin:0 5px 0;
}
}

@media screen and (min-width: 0px) and (max-width: 1080px) {
  .main-nav {
    display: none;
}
}
@media screen and (min-width: 0px) and (max-width: 600px) {
.main-nav {
  display: none;
}
.main-nav li {
  text-align: center;
  font-size: .75rem;
}
.main-nav a {
  width: 4rem;
}
}