.fade-in {
  animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.focus-ring:focus-visible {
  outline: 2px solid #4F7865;
  outline-offset: 2px;
}

section {
  scroll-margin-top: 6rem;
}

/* --------------------------------------------------------------------------
   スマホハンバーガーメニュー（ヘッダー下フルブリード・右からスライド）
   -------------------------------------------------------------------------- */

.nav-menu-icon {
  display: block;
  position: relative;
  width: 1.625rem;
  height: 1.25rem;
}

.nav-menu-icon-bar {
  display: block;
  position: absolute;
  left: 0;
  width: 100%;
  height: 2.5px;
  border-radius: 2px;
  background: currentColor;
  transform-origin: center;
  transition:
    transform 280ms cubic-bezier(0.16, 1, 0.3, 1),
    opacity 220ms ease,
    top 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-menu-icon-bar:nth-child(1) { top: 0; }
.nav-menu-icon-bar:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav-menu-icon-bar:nth-child(3) { top: 100%; transform: translateY(-100%); }

.nav-menu-btn.is-open .nav-menu-icon-bar:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.nav-menu-btn.is-open .nav-menu-icon-bar:nth-child(2) {
  opacity: 0;
  transform: translateY(-50%) scaleX(0.35);
}

.nav-menu-btn.is-open .nav-menu-icon-bar:nth-child(3) {
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
}

.nav-mobile-root {
  --nav-header-h: 4rem; /* h-16 */
  position: fixed;
  top: var(--nav-header-h);
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 40;
  pointer-events: none;
}

@media (min-width: 640px) {
  .nav-mobile-root {
    --nav-header-h: 5rem; /* sm:h-20 */
  }
}

.nav-mobile-root[hidden] {
  display: none !important;
}

.nav-mobile-scrim {
  position: absolute;
  inset: 0;
  background: rgba(45, 55, 50, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 320ms cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-mobile-root.is-open .nav-mobile-scrim {
  opacity: 1;
  pointer-events: auto;
}

.nav-mobile-root.is-closing .nav-mobile-scrim {
  opacity: 0;
  pointer-events: none;
  transition-duration: 420ms; /* 余韻：パネルより長く残す */
}

.nav-mobile-panel {
  position: absolute;
  inset: 0;
  background: #F4F8F5;
  box-shadow: -12px 0 40px -12px rgba(45, 55, 50, 0.28);
  opacity: 1;
  transform: translateX(100%);
  pointer-events: none;
  transition: transform 420ms cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.nav-mobile-root.is-open .nav-mobile-panel {
  transform: translateX(0);
  pointer-events: auto;
}

.nav-mobile-root.is-closing .nav-mobile-panel {
  transform: translateX(100%);
  pointer-events: none;
  transition-duration: 300ms;
}

.nav-mobile-panel-inner {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 0.5rem 1.25rem 2.5rem;
  padding-bottom: max(2.5rem, env(safe-area-inset-bottom));
}

.nav-mobile-head {
  display: flex;
  align-items: center;
  padding: 1rem 0 1.125rem;
  border-bottom: 1px solid rgba(79, 120, 101, 0.15);
}

.nav-mobile-title {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #4F7865;
}

.nav-mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  padding-top: 1.5rem;
}

.nav-mobile-link {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.35rem;
  min-height: 5rem; /* 80px */
  padding: 1.25rem 1.35rem;
  background: #fff;
  border: 1px solid #e8eee9;
  border-radius: 1rem;
  box-shadow: 0 2px 8px -4px rgba(45, 55, 50, 0.1);
  opacity: 0;
  transform: translateX(1.25rem);
  transition:
    color 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease,
    box-shadow 200ms ease,
    opacity 380ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 380ms cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-mobile-link-label {
  font-size: 1.375rem; /* 22px */
  font-weight: 700;
  line-height: 1.3;
  color: #2D3732;
  letter-spacing: 0.01em;
}

.nav-mobile-link-hint {
  font-size: 0.875rem; /* 14px */
  font-weight: 500;
  line-height: 1.4;
  color: #6b7280;
}

.nav-mobile-link:hover,
.nav-mobile-link:focus-visible {
  border-color: #4F7865;
  background: #EAF1ED;
  box-shadow: 0 6px 16px -8px rgba(79, 120, 101, 0.35);
}

.nav-mobile-link:hover .nav-mobile-link-label,
.nav-mobile-link:focus-visible .nav-mobile-link-label {
  color: #3D5E4F;
}

.nav-mobile-link:active {
  transform: scale(0.985);
}

.nav-mobile-root.is-open .nav-mobile-link {
  opacity: 1;
  transform: translateX(0);
}

.nav-mobile-root.is-open .nav-mobile-link:nth-child(1) { transition-delay: 70ms; }
.nav-mobile-root.is-open .nav-mobile-link:nth-child(2) { transition-delay: 130ms; }
.nav-mobile-root.is-open .nav-mobile-link:nth-child(3) { transition-delay: 190ms; }

.nav-mobile-root.is-closing .nav-mobile-link {
  opacity: 0;
  transform: translateX(0.75rem);
  transition-delay: 0ms;
  transition-duration: 180ms;
}

@media (prefers-reduced-motion: reduce) {
  .nav-menu-icon-bar,
  .nav-mobile-scrim,
  .nav-mobile-panel,
  .nav-mobile-link {
    transition-duration: 1ms !important;
    transition-delay: 0ms !important;
  }

  .nav-mobile-panel,
  .nav-mobile-link {
    transform: none !important;
  }
}