/* 常夜燈サイト共通スタイル：ヘッダー・展開メニュー・フッター */

/* スクロール方向に応じてヘッダーを隠す／出す（ゆっくり動かす） */

.nav {
  transition: transform .6s cubic-bezier(.4,0,.2,1);
}

.nav.nav--hidden {
  transform: translateY(-100%);
}

/* ハンバーガーボタン */

.nav-menu-btn {
  background: transparent;
  border: 1px solid currentColor;
  color: inherit;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  transition: background .25s,color .25s;
}

.nav-menu-btn:hover {
  background: currentColor;
}

.nav-menu-btn:hover .bars span {
  background: var(--paper);
}

.nav-menu-btn .bars {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 18px;
}

.nav-menu-btn .bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform .35s cubic-bezier(.2,.7,.2,1),opacity .25s;
  transform-origin: center;
}

.nav-menu-btn .bars span:nth-child(1) {
  width: 100%;
}

.nav-menu-btn .bars span:nth-child(2) {
  width: 70%;
  align-self: flex-end;
}

.nav-menu-btn .bars span:nth-child(3) {
  width: 100%;
}

/* 展開メニュー */

.menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 100vh;
  background: var(--ink);
  color: var(--paper);
  z-index: 49;
  clip-path: circle(0% at calc(100% - var(--gutter) - 22px) calc(var(--nav-h) / 2));
  transition: clip-path .55s cubic-bezier(.65,0,.35,1);
  pointer-events: none;
}

.menu-overlay .bg-img {
  position: absolute;
  inset: 0;
  background-image: url('../assets/forhero_web.jpg');
  background-size: cover;
  background-position: 50% 30%;
  opacity: 0.20;
  filter: saturate(0.7);
  pointer-events: none;
}

.menu-overlay .bg-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom right,rgba(8,10,18,0.92) 0%,rgba(8,10,18,0.70) 50%,rgba(8,10,18,0.92) 100%);
}

.menu-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: calc(var(--nav-h) + 56px) var(--gutter) 56px;
  height: 100%;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(40px,6vw,96px);
  align-items: start;
}

.menu-primary {
  display: flex;
  flex-direction: column;
  gap: clamp(8px,1.2vw,16px);
  font-family: var(--serif-jp);
  font-weight: 500;
}

.menu-primary a {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 18px;
  color: var(--paper);
  font-size: clamp(28px,4vw,44px);
  letter-spacing: 0.12em;
  line-height: 1.3;
  padding: 16px 0;
  border-bottom: 1px solid rgba(244,237,224,0.18);
  transition: padding-left .35s cubic-bezier(.2,.7,.2,1),border-color .25s,color .2s;
}

.menu-primary a:hover {
  padding-left: 14px;
  border-bottom-color: rgba(244,237,224,0.55);
  color: var(--glow);
}

.menu-primary a .en {
  font-family: var(--serif-en);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.32em;
  color: rgba(244,237,224,0.55);
  align-self: center;
}

.menu-secondary {
  display: flex;
  flex-direction: column;
  gap: 28px;
  align-self: start;
  padding-top: 6px;
}

.menu-secondary .group .k {
  display: block;
  font-family: var(--serif-jp);
  font-size: 10.5px;
  letter-spacing: 0.32em;
  color: rgba(244,237,224,0.5);
  margin-bottom: 10px;
}

.menu-secondary a,.menu-secondary .info {
  display: block;
  font-family: var(--serif-jp);
  font-size: 14px;
  line-height: 1.95;
  color: var(--paper);
  letter-spacing: 0.06em;
  padding: 3px 0;
  transition: color .2s;
}

.menu-secondary a:hover {
  color: var(--glow);
}

/* メニュー展開時の状態 */

body.menu-open .nav-menu-btn .bars span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

body.menu-open .nav-menu-btn .bars span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

body.menu-open .nav-menu-btn .bars span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

body.menu-open .nav {
  background: transparent!important;
  backdrop-filter: none;
  border-bottom: none;
  transform: none!important;
  transition: none;
  z-index: 60;
}

body.menu-open .nav,body.menu-open .nav .brand, body.menu-open .nav .brand .brand-text .jp {
  color: #f1ede2;
}

body.menu-open .nav .brand svg.mark {
  color: #f1ede2;
}

body.menu-open .nav .brand .brand-text .en {
  color: rgba(241,237,226,0.65);
}

body.menu-open .nav-menu-btn {
  color: #f1ede2;
}

body.menu-open {
  overflow: hidden;
}

body.menu-open .menu-overlay {
  clip-path: circle(160% at calc(100% - var(--gutter) - 22px) calc(var(--nav-h) / 2));
  pointer-events: auto;
}

/* フッター */

.footer-col h4 {
  font-family: var(--serif-jp);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: none;
  margin: 0;
}

.footer-col a {
  font-family: var(--serif-jp);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.footer-bottom {
  font-family: var(--serif-jp);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: none;
}

.footer-inner {
  align-items: start;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--serif-jp);
  font-size: 28px;
  font-weight: 500;
  letter-spacing: 0.18em;
}

.footer-brand-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  line-height: 1;
}

.footer-brand .jp {
  margin: 0;
}

.footer-brand .en {
  font-family: var(--serif-en);
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--ink-soft);
  font-weight: 400;
}

.footer-brand .mark {
  display: block;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

/* レスポンシブ */

@media(max-width:860px) {
  .menu-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: calc(var(--nav-h) + 32px);
    align-items: start;
  }
  .menu-primary a {
    grid-template-columns: 1fr;
  }
  .menu-primary a .en {
    display: none;
  }
}

/* 透過ナビ */

/* ヒーロー夜景に重なるときの透過ナビ（home のみ作用） */

.nav.on-night {
  background: linear-gradient(to bottom,rgba(8,10,18,0.55),rgba(8,10,18,0.15));
  border-bottom: none;
  backdrop-filter: blur(8px) saturate(120%);
  -webkit-backdrop-filter: blur(8px) saturate(120%);
}

.nav.on-night, .nav.on-night .brand, .nav.on-night .brand .brand-text .jp {
  color: #f1ede2;
}

.nav.on-night .brand svg.mark {
  color: #f1ede2;
}

.nav.on-night .brand .brand-text .en {
  color: rgba(241,237,226,0.65);
}

/* 没入ダークテーマ（ホーム・アプリ紹介）：固定の夜景の上に全要素を乗せる */

body.theme-night {
  background: linear-gradient(to bottom, rgba(8,10,18,0.42), rgba(8,10,18,0.66)),
      url('../assets/forhero_web.jpg') center / cover fixed no-repeat;
  background-color: #0a0d16;
  color: #f1ede2;
}

/* 各セクションは固定背景を透かす（自前の背景は持たせない） */

body.theme-night .hero,
body.theme-night .app-hero,
body.theme-night .features {
  background: transparent;
}

body.theme-night .features {
  border-top: none;
}

body.theme-night .hero .bg,
body.theme-night .app-hero .bg {
  display: none;
}

/* ヘッダーは独立したバーにせず、常に夜景に完全に溶け込ませる（帯・ぼかしなし）。
   下スクロールで隠れるため、視認性確保のためのスクリムは不要。 */

body.theme-night .nav {
  background: transparent;
  border-bottom: none;
  color: #f4f0e4;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

/* 夜景の上ではボタンのホバーを明色塗りにしない（×が消えないように） */

body.theme-night .nav-menu-btn:hover {
  background: rgba(244,240,228,0.14);
}

body.theme-night .nav-menu-btn:hover .bars span {
  background: #f4f0e4;
}

body.theme-night .brand, body.theme-night .brand svg.mark, body.theme-night .brand .brand-text .jp {
  color: #f4f0e4;
}

body.theme-night .brand .brand-text .en {
  color: rgba(241,237,226,0.6);
}

/* フッターも背景の上に透過で乗せる（境界線は出さない） */

body.theme-night footer {
  background: transparent;
  border-top: none;
}

body.theme-night .footer-brand {
  color: #f4f0e4;
}

body.theme-night .footer-brand .jp, body.theme-night .footer-brand .en, body.theme-night .footer-col h4, body.theme-night .footer-col a {
  color: rgba(241,237,226,0.72);
}

body.theme-night .footer-col a:hover {
  color: #f4f0e4;
}