:root {
  --brand-primary: #be9000;
  --brand-hover: #a87a00;
  --brand-accent: #be9000;
  --bg-footer: #3a3838; /* フッターの背景色（はいけいしょく） */
  --text-main: #1e293b; /* メインの文字色（もじいろ） */
  --text-muted: #64748b; /* 補助（ほじょ）テキストの色 */
  --header-height: 8.5rem; /* ヘッダーの高さ（たかさ） */
  --header-height-fixed: 8.2rem; /* ヘッダーの高さ（たかさ） */
}

#main-nav {
  transition: all 0.4s ease;
  height: var(--header-height);
}
.home#main-nav {
  background-color: transparent;
}
#main-nav.scrolled {
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  height: var(--header-height-fixed);
}

.nav-link {
  position: relative;
  transition:
    color 0.3s ease,
    all 0.3s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  width: 0;
  height: 3px;
  bottom: -6px;
  left: 0;
  background-color: var(--brand-primary);
  transition: width 0.3s ease;
}

/* ホバー時とActiveクラス付与時に下線を表示 */
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
  color: var(--brand-primary) !important;
}

/* Active時に文字を青く光らせる */
.nav-link.active {
  color: var(--brand-primary) !important;
  text-shadow: 0 0 10px rgba(37, 99, 235, 0.5);
}

/* モバイルメニュー表示用アニメーション */
#mobile-menu {
  transition: all 0.4s ease-in-out;
  transform: translateY(-20px);
  opacity: 0;
  pointer-events: none;
}

#mobile-menu.show {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.img-container {
  border-radius: 2rem;
  overflow: hidden;
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.15);
  position: relative;
}

.img-container img {
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  width: 100%;
}

.img-container:hover img {
  transform: scale(1.08);
}

.custom-leading {
  line-height: 2.2 !important;
}

@keyframes scroll-bounce {
  0%,
  100% {
    transform: translateY(0);
    opacity: 0.6;
  }

  50% {
    transform: translateY(12px);
    opacity: 1;
  }
}

.animate-scroll {
  animation: scroll-bounce 2s infinite ease-in-out;
}

/* Back to top ボタンの表示制御 */
#back-to-top {
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

#back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.inputError,
.select-box > .inputError {
  border-color: #ff0000 !important;
}

.height-screen {
  height: 100vh;
  height: 100dvh;
}