.gnav {
  position: fixed; top: 0; left: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; height: var(--nav-h);
  padding: 0 calc(var(--gut) + 10px);
  transition: background .3s;
}
.is-scrolled .gnav { background: rgba(251, 247, 241, .92); }
.gnav__brand { display: flex; align-items: baseline; gap: 30px; }
.gnav__logo { font-family: var(--ff-mincho); font-size: 28px; font-weight: 500; line-height: 33px; letter-spacing: .2em; color: var(--ink-head); }
.gnav__tagline { font-size: 14px; line-height: 21px; letter-spacing: .1em; }
.gnav__list { display: flex; align-items: center; gap: 30px; font-size: 15px; line-height: 19px; color: var(--ink-head); }
.gnav__list a { transition: opacity .3s; }
.gnav__list a:hover { opacity: .6; }
.gnav__tel { display: inline-flex; align-items: center; gap: 6px; color: var(--accent); font-weight: 500; }
.gnav__toggle { display: none; }

/* PC の右端に固定する Instagram */
.side-sns {
  position: fixed; right: 18px; top: 50%; z-index: 40;
  display: flex; color: var(--ink-head);
  transition: opacity .3s;
}
.side-sns:hover { opacity: .6; }

@media (max-width: 1099px) {
  .gnav__tagline { display: none; }
}
@media (max-width: 899px) {
  .side-sns { display: none; }
  .gnav { justify-content: flex-start; gap: 20px; padding: 0 24px; }
  .gnav__toggle {
    position: relative; z-index: 2;
    display: block; width: 32px; height: 32px; flex: none;
  }
  .gnav__toggle span {
    position: absolute; left: 4px; width: 24px; height: 2px;
    background: var(--ink-head);
    transition: transform .3s, opacity .3s;
  }
  .gnav__toggle span:nth-child(1) { top: 9px; }
  .gnav__toggle span:nth-child(2) { top: 15px; }
  .gnav__toggle span:nth-child(3) { top: 21px; }
  .is-menu-open .gnav__toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .is-menu-open .gnav__toggle span:nth-child(2) { opacity: 0; }
  .is-menu-open .gnav__toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .gnav__brand { position: relative; z-index: 2; display: block; }
  .gnav__logo { display: block; font-size: 24px; line-height: 26px; }
  .gnav__tagline { display: block; margin-top: 6px; font-size: 10px; line-height: 14px; }
  .gnav__list {
    position: fixed; inset: 0; z-index: 1;
    flex-direction: column; justify-content: center; gap: 34px;
    background: var(--bg);
    font-size: 18px;
    opacity: 0; visibility: hidden;
    transition: opacity .4s, visibility .4s;
  }
  .is-menu-open .gnav__list { opacity: 1; visibility: visible; }
  .is-menu-open body { overflow: hidden; }
}