/* ==============================
   追従ヘッダー
============================== */
.sp-header{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 10000;
  background: rgba(255,255,255,.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px rgba(0,0,0,.06);
}
.sp-header{
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate(-50%, -12px);
  transition: opacity .28s ease, transform .28s ease, visibility .28s ease;
  max-width: 430px;
  left: 50%;
}

.sp-header.is-visible{
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.sp-header__inner{
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 16px;
}

.sp-header__logo{
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.sp-header__logo img{
  display: block;
  width: auto;
  height: 34px;
  max-width: 220px;
}

/* ハンバーガー */
.sp-header__toggle{
  position: relative;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  padding: 0;
  cursor: pointer;
  flex-shrink: 0;
}

.sp-header__toggle span{
  position: absolute;
  left: 10px;
  width: 24px;
  height: 2px;
  border-radius: 999px;
  background: #355f50;
  transition: transform .28s ease, opacity .28s ease, top .28s ease;
}

.sp-header__toggle span:nth-child(1){ top: 14px; }
.sp-header__toggle span:nth-child(2){ top: 21px; }
.sp-header__toggle span:nth-child(3){ top: 28px; }

.sp-header.is-open .sp-header__toggle span:nth-child(1){
  top: 21px;
  transform: rotate(45deg);
}
.sp-header.is-open .sp-header__toggle span:nth-child(2){
  opacity: 0;
}
.sp-header.is-open .sp-header__toggle span:nth-child(3){
  top: 21px;
  transform: rotate(-45deg);
}

/* メニュー */
.sp-nav{
  max-height: 0;
  overflow: hidden;
  background: rgba(255,255,255,.97);
  transition: max-height .32s ease;
  border-top: 1px solid rgba(40, 60, 50, .06);
}

.sp-header.is-open .sp-nav{
  max-height: 320px;
}

.sp-nav__list{
  list-style: none;
  margin: 0;
  padding: 8px 0 16px;
}

.sp-nav__list li{
  margin: 0;
  padding: 0;
}

.sp-nav__list a{
  display: block;
  padding: 16px 20px;
  color: #355f50;
  text-decoration: none;
  font-size: 1.5rem;
  border-bottom: 1px solid rgba(40, 60, 50, .06);
}

.sp-nav__list a:hover{
  background: rgba(106, 163, 138, .08);
}