/*
  header.css
  サイトヘッダー・ナビゲーション・ハンバーガー。
  同一DOMで、960px未満はドロップダウン式メニュー、960px以上は横並びに切り替える。
*/

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgb(250 250 248 / 0.97);
  box-shadow: 0 1px 0 var(--color-border);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.site-logo {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  line-height: 1.55;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

/* ---- Hamburger ---- */
.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  margin-right: -0.5rem;
}

.hamburger__line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-header.is-open .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header.is-open .hamburger__line:nth-child(2) {
  opacity: 0;
}

.site-header.is-open .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Menu（Mobile: ドロップダウン） ---- */
.site-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  flex-direction: column;
  padding: 1.75rem var(--container-padding) 2rem;
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 1px 0 var(--color-border);
}

.site-header.is-open .site-menu {
  display: flex;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.site-nav__list a {
  font-family: var(--font-accent);
  font-style: italic;
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
}

.site-nav__list a:hover {
  color: var(--color-accent);
  opacity: 1;
}

.site-menu__contact {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.site-menu__contact .btn {
  order: -1;
  padding-inline: 0;
  font-size: 0.875rem;
}

.site-menu__contact .btn__icon {
  width: 1rem;
  height: 1rem;
}

.site-menu__contact .tel-link {
  justify-content: center;
  padding-block: 0;
  font-size: 0.875rem;
  gap: 0.375rem;
}

.site-menu__contact .tel-link__icon {
  width: 1rem;
  height: 1rem;
}

.site-menu__contact .tel-link__note {
  font-size: inherit;
  color: inherit;
}

.btn__note {
  display: inline;
}

/* ---- Desktop ---- */
@media (min-width: 960px) {
  .site-header__inner {
    gap: 2.5rem;
    justify-content: flex-start;
  }

  .site-logo {
    font-size: 1.15rem;
    letter-spacing: 0.05em;
  }

  .hamburger {
    display: none;
  }

  .site-menu {
    display: flex;
    position: static;
    flex: 1;
    flex-direction: row;
    align-items: center;
    gap: 2.5rem;
    padding: 0;
    background: none;
    border: 0;
    box-shadow: none;
  }

  .site-nav {
    margin-left: auto;
  }

  .site-nav__list {
    flex-direction: row;
    gap: 1.75rem;
  }

  .site-nav__list a {
    font-size: 0.78rem;
    line-height: 1.5;
  }

  .site-menu__contact {
    flex-direction: row;
    align-items: center;
    gap: 1.25rem;
    margin-top: 0;
    padding-left: 1.5rem;
    border-left: 1px solid var(--color-border);
  }

  .site-menu__contact .btn {
    order: 0;
    gap: 0.375rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.8125rem;
  }

  .site-menu__contact .btn__icon {
    width: 0.875rem;
    height: 0.875rem;
  }

  .site-menu__contact .btn__note,
  .site-menu__contact .tel-link__note,
  .site-menu__contact .tel-link__icon {
    display: none;
  }

  .site-menu__contact .tel-link {
    font-size: 0.78rem;
    letter-spacing: 0.025em;
    color: rgb(107 94 82 / 0.8);
  }
}