#site-title {
  position: fixed;
  top: 24px;
  left: 28px;
  font-size: 13px;
  letter-spacing: 0.28em;
  line-height: 1.6;
  z-index: 100; /* ボタン(200)より下にする */
}

#site-title a {
  color: #fff;
  text-decoration: none;
  pointer-events: auto; /* リンクはクリック可能に */
}

#site-title span {
  font-size: 10px;
}

/* ハンバーガーボタン */
.hamburger-btn {
  position: fixed;
  top: 24px;
  right: 24px;
  width: 44px; /* 少し押しやすく拡大 */
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 200; /* メニュー(150)よりも上、タイトルよりも上 */
  padding: 0;
}

.hamburger-btn .line {
  display: block;
  width: 24px;
  height: 1px;
  background: rgba(255,255,255,0.8);
  margin: 8px auto;
  transition: transform 0.4s ease, opacity 0.4s ease;
}

.hamburger-btn.is-open .line:nth-child(1) {
  transform: translateY(4.5px) rotate(45deg);
}
.hamburger-btn.is-open .line:nth-child(2) {
  transform: translateY(-4.5px) rotate(-45deg);
}

/* ナビゲーションメニュー */
.nav-menu {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 150; /* ボタンよりは下 */
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.8s ease;
}

.nav-menu.is-open {
  opacity: 1;
  pointer-events: auto;
}

.nav-links {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.nav-links a {
  display: block;
  color: #fff;
  text-decoration: none;
  font-size: 20px;
  margin: 18px 0;
  letter-spacing: 0.2em;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease, color 0.3s ease;
}

.nav-menu.is-open .nav-links a {
  opacity: 1;
  transform: translateY(0);
}

/* アニメーション遅延 */
.nav-links a:nth-child(1) { transition-delay: 0.2s; }
.nav-links a:nth-child(2) { transition-delay: 0.3s; }
.nav-links a:nth-child(3) { transition-delay: 0.4s; }
.nav-links a:nth-child(4) { transition-delay: 0.5s; }
.nav-links a:nth-child(5) { transition-delay: 0.6s; }
.nav-links a:nth-child(6) { transition-delay: 0.7s; }
.nav-links a:nth-child(7) { transition-delay: 0.8s; }

.instagram-icon svg {
  width: 28px;
  height: 28px;
  vertical-align: middle;
}