body {
  font-family: "Noto Sans JP", sans-serif;
}
.font-oswald {
  font-family: "Oswald", sans-serif;
}

/* ヒーローレイヤー */
.hero-layer {
  position: absolute;
  will-change: transform, opacity;
  transition: transform 0.1s linear;
}

/* アニメーション */
.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease-out;
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* タイムライン */
.timeline-line-bg {
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: #e2e8f0;
  z-index: 0;
}
.timeline-line-progress {
  position: absolute;
  left: 24px;
  top: 0;
  width: 2px;
  height: 0%;
  background-color: #ef4444;
  z-index: 1;
  transition: height 0.1s linear;
}
.timeline-dot {
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.timeline-item.active .timeline-dot {
  background-color: #ef4444;
  border-color: #ef4444;
  transform: scale(1.2);
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.2);
}
.timeline-card {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease-out;
}
.timeline-item.active .timeline-card {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 768px) {
  .timeline-line-bg,
  .timeline-line-progress {
    left: 50%;
    transform: translateX(-50%);
  }
}

/* モバイルメニューの滑らかなアニメーション */
#mobile-menu {
  transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1),
    visibility 0.4s linear;
}
.menu-closed {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.menu-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* リンクが順番に出てくるアニメーション */
.mobile-link {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.menu-open .mobile-link {
  opacity: 1;
  transform: translateY(0);
}
.menu-open .mobile-link:nth-child(1) {
  transition-delay: 0.1s;
}
.menu-open .mobile-link:nth-child(2) {
  transition-delay: 0.15s;
}
.menu-open .mobile-link:nth-child(3) {
  transition-delay: 0.2s;
}
.menu-open .mobile-link:nth-child(4) {
  transition-delay: 0.25s;
}

@keyframes slide-down {
  0% {
    transform: translateY(-100%);
  }
  100% {
    transform: translateY(100%);
  }
}
.animate-slide-down {
  animation: slide-down 1.5s cubic-bezier(0.8, 0, 0.2, 1) infinite;
}