/* header.css - Site header (sticky) */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-1);
}

.site-header__inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--sp-5);
  height: 104px;
  display: flex;
  align-items: center;
  gap: var(--sp-5);
}

/* --- Logo ----------------------------------------------------- */
.site-header__logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.site-header__logo img {
  height: 77px;
  width: auto;
  display: block;
}

/* --- Nav (desktop) ------------------------------------------- */
.site-header__nav {
  margin-left: auto;
}
.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}
.site-header__nav-list a {
  position: relative;
  display: inline-block;
  padding: var(--sp-2) 0;
  font-family: var(--font-body);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--fg-1);
  transition: color var(--t-base) var(--ease);
}
.site-header__nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--cal-teal);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--t-base) var(--ease);
}
.site-header__nav-list a:hover {
  color: var(--cal-teal);
}
.site-header__nav-list a:hover::after,
.site-header__nav-list a.is-active::after {
  transform: scaleX(1);
}

/* --- Mobile hamburger toggle --------------------------------- */
.site-header__toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  margin-left: auto;
  border-radius: var(--r-md);
}
.site-header__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--fg-1);
  border-radius: 1px;
  transform-origin: center;
  transition:
    transform var(--t-base) var(--ease),
    opacity var(--t-base) var(--ease);
}
.site-header.is-menu-open .site-header__toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.site-header.is-menu-open .site-header__toggle span:nth-child(2) {
  opacity: 0;
}
.site-header.is-menu-open .site-header__toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* お問い合わせ専用ナビ項目（mobileだけ表示・desktopでは非表示） */
.site-header__nav-contact {
  display: none;
}

/* --- Mobile (≤768px) ----------------------------------------- */
@media (max-width: 768px) {
  .site-header__inner {
    height: 84px;
    gap: var(--sp-3);
  }
  .site-header__logo img {
    height: 64px;
  }

  /* Drawer */
  .site-header__nav {
    position: fixed;
    top: 84px;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: calc(100vh - 84px);
    height: calc(100dvh - 84px); /* iOS Safari の動的ビューポート対応 */
    margin: 0;
    padding: var(--sp-6) var(--sp-5);
    background: var(--cal-white);
    transform: translateX(100%);
    transition: transform var(--t-slow) var(--ease);
    z-index: 90;
    overflow-y: auto;
    visibility: hidden;
  }
  .site-header.is-menu-open .site-header__nav {
    transform: translateX(0);
    visibility: visible;
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .site-header__nav-list li {
    border-bottom: 1px solid var(--line-1);
  }
  .site-header__nav-list a {
    display: block;
    padding: var(--sp-4) 0;
    font-size: var(--fs-body-lg);
    font-weight: var(--fw-medium);
  }
  .site-header__nav-list a::after {
    display: none;
  }

  /* お問い合わせ専用nav itemをmobileのみ表示 */
  .site-header__nav-contact {
    display: list-item;
  }

  /* オレンジCTAボタンはモバイル時に非表示（drawer内のお問い合わせnav itemに統合） */
  .site-header__inner > .btn--accent {
    display: none;
  }

  /* ハンバーガーはdrawer開いてる時もtop layerで表示維持 */
  .site-header__toggle {
    display: flex;
    position: relative;
    z-index: 101; /* header(100) より高い */
    margin-left: auto;
  }
}