/* ===========================================================
   Common CSS for Sub Pages (menu.html / concept.html)
   トップページとデザイン世界観を統一しつつ、下層ページに必要な
   独自スタイルを定義
   =========================================================== */

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

:root {
  --bg-main: #FDFCFA;
  --bg-secondary: #F5F2EC;
  --bg-dark: #0E0E0E;
  --ink-primary: #1A1A1A;
  --ink-secondary: #3A3A3A;
  --ink-tertiary: #6A6A6A;
  --ink-muted: #999999;
  --accent-gold: #8A7D5F;
  --accent-gold-light: #B8AD8A;
  --accent-gold-bright: #C9B989;
  --line: rgba(26, 26, 26, 0.12);
  --line-on-dark: rgba(255, 255, 255, 0.18);
  --font-serif-jp: 'Noto Serif JP', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  --font-sans-jp: 'Noto Sans JP', 'Hiragino Sans', sans-serif;
  --font-serif-en: 'Cormorant Garamond', serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

html, body {
  background: var(--bg-main);
  color: var(--ink-primary);
  font-family: var(--font-serif-jp);
  font-weight: 300;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body { padding-bottom: 72px; }

/* ============== Reveal Animation ============== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1.2s var(--ease), transform 1.2s var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal.d-1 { transition-delay: 0.12s; }
.reveal.d-2 { transition-delay: 0.24s; }
.reveal.d-3 { transition-delay: 0.36s; }
.reveal.d-4 { transition-delay: 0.48s; }

/* ============== HEADER ============== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(253, 252, 250, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 0.5px solid var(--line);
  color: var(--ink-primary);
  transition: background 0.4s ease;
}

.logo {
  font-family: var(--font-serif-jp);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.25em;
  line-height: 1.3;
  color: var(--ink-primary);
  text-decoration: none;
}
.logo .en {
  font-family: var(--font-serif-en);
  font-size: 9px;
  font-style: italic;
  letter-spacing: 0.3em;
  display: block;
  margin-top: 2px;
  color: var(--ink-tertiary);
}

.hamburger {
  width: 28px;
  height: 22px;
  position: relative;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  gap: 7px;
}
.hamburger span {
  display: block;
  width: 26px;
  height: 1px;
  background: var(--ink-primary);
  transition: all 0.4s var(--ease);
}
.hamburger span:nth-child(2) { width: 18px; }
.hamburger.active span:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
  width: 26px;
}
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
  width: 26px;
}

.menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-main);
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s var(--ease);
  display: flex;
  align-items: center;
  justify-content: center;
}
.menu-overlay.open {
  opacity: 1;
  pointer-events: auto;
}
.menu-nav { text-align: center; }
.menu-nav-label {
  font-family: var(--font-serif-en);
  font-size: 12px;
  letter-spacing: 0.45em;
  color: var(--accent-gold);
  font-style: italic;
  margin-bottom: 3rem;
  display: block;
}
.menu-nav ul { list-style: none; }
.menu-nav li {
  margin: 1.5rem 0;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s var(--ease);
}
.menu-overlay.open .menu-nav li {
  opacity: 1;
  transform: translateY(0);
}
.menu-overlay.open .menu-nav li:nth-child(1) { transition-delay: 0.2s; }
.menu-overlay.open .menu-nav li:nth-child(2) { transition-delay: 0.28s; }
.menu-overlay.open .menu-nav li:nth-child(3) { transition-delay: 0.36s; }
.menu-overlay.open .menu-nav li:nth-child(4) { transition-delay: 0.44s; }
.menu-overlay.open .menu-nav li:nth-child(5) { transition-delay: 0.52s; }
.menu-overlay.open .menu-nav li:nth-child(6) { transition-delay: 0.6s; }

.menu-nav a {
  font-family: var(--font-serif-jp);
  font-size: 22px;
  font-weight: 300;
  letter-spacing: 0.25em;
  color: var(--ink-primary);
  text-decoration: none;
  display: inline-block;
  padding: 0.5rem 0;
}
.menu-nav a .en {
  display: block;
  font-family: var(--font-serif-en);
  font-style: italic;
  font-size: 11px;
  letter-spacing: 0.35em;
  color: var(--accent-gold);
  margin-top: 0.5rem;
}

/* ============== FIXED BOTTOM RESERVE ============== */
.fixed-reserve {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 98;
  background: var(--ink-primary);
  color: var(--bg-main);
  padding: 1.1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  transition: all 0.4s var(--ease);
}
.fixed-reserve:hover { background: var(--accent-gold); }
.fixed-reserve-label {
  font-family: var(--font-serif-en);
  font-size: 11px;
  letter-spacing: 0.35em;
  color: var(--accent-gold-light);
  font-style: italic;
}
.fixed-reserve-text {
  font-family: var(--font-serif-jp);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.2em;
}
.fixed-reserve-arrow {
  font-family: var(--font-serif-en);
  font-size: 16px;
  color: var(--accent-gold-bright);
}

/* ============== PAGE HEADER ============== */
.page-header {
  padding: 8rem 1.5rem 5rem;
  text-align: center;
  background: var(--bg-main);
}
.page-header-label {
  font-family: var(--font-serif-en);
  font-size: 16px;
  letter-spacing: 0.45em;
  color: var(--accent-gold);
  font-style: italic;
  margin-bottom: 1.5rem;
  font-weight: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}
.page-header-label::before,
.page-header-label::after {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: var(--accent-gold);
  opacity: 0.6;
}
.page-header-title {
  font-family: var(--font-serif-jp);
  font-size: clamp(26px, 7vw, 38px);
  font-weight: 300;
  letter-spacing: 0.2em;
  color: var(--ink-primary);
  line-height: 1.6;
  margin-bottom: 1rem;
}
.page-header-subtitle {
  font-family: var(--font-serif-jp);
  font-size: 13px;
  line-height: 2.2;
  letter-spacing: 0.1em;
  color: var(--ink-tertiary);
  margin-top: 1rem;
}

/* ============== SECTION COMMON ============== */
.section {
  padding: 5rem 1.5rem;
  background: var(--bg-main);
}
.section-secondary { background: var(--bg-secondary); }
.section-dark {
  background: var(--bg-dark);
  color: var(--bg-main);
}
.section-label {
  font-family: var(--font-serif-en);
  font-size: 16px;
  letter-spacing: 0.45em;
  color: var(--accent-gold);
  font-style: italic;
  margin-bottom: 1.5rem;
  text-align: center;
  font-weight: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}
.section-label::before,
.section-label::after {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: var(--accent-gold);
  opacity: 0.6;
}
.section-dark .section-label { color: var(--accent-gold-bright); }
.section-dark .section-label::before,
.section-dark .section-label::after { background: var(--accent-gold-bright); }
.section-title {
  font-family: var(--font-serif-jp);
  font-size: clamp(22px, 6.5vw, 32px);
  font-weight: 300;
  letter-spacing: 0.2em;
  color: var(--ink-primary);
  text-align: center;
  margin-bottom: 1rem;
  line-height: 1.6;
}
.section-dark .section-title { color: var(--bg-main); }
.section-divider {
  width: 0;
  height: 1px;
  background: var(--accent-gold);
  margin: 2rem auto 3rem;
  transition: width 1.3s var(--ease) 0.3s;
}
.section-divider.visible { width: 28px; }
.section-intro {
  max-width: 540px;
  margin: 0 auto 3rem;
  text-align: center;
  font-family: var(--font-serif-jp);
  font-size: 13px;
  line-height: 2.3;
  letter-spacing: 0.1em;
  color: var(--ink-secondary);
}

/* ============== BACK TO TOP LINK ============== */
.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-serif-en);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--accent-gold);
  text-decoration: none;
  font-style: italic;
  padding: 0.5rem 0;
  transition: all 0.3s ease;
}
.back-to-top:hover { color: var(--ink-primary); }
.back-to-top-arrow {
  display: inline-block;
  transition: transform 0.3s ease;
}
.back-to-top:hover .back-to-top-arrow {
  transform: translateX(-4px);
}

.breadcrumb {
  padding: 1.5rem;
  background: var(--bg-main);
  text-align: center;
  border-bottom: 0.5px solid var(--line);
  margin-top: 60px;
}

/* ============== FOOTER ============== */
.footer {
  padding: 4rem 1.5rem 2.5rem;
  background: var(--bg-secondary);
  border-top: 0.5px solid var(--line);
}
.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin-bottom: 3rem;
}
.footer-logo {
  font-family: var(--font-serif-jp);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--ink-primary);
}
.footer-logo .en {
  font-family: var(--font-serif-en);
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--ink-tertiary);
  display: block;
  margin-top: 4px;
  font-style: italic;
}
.footer-brand-tag {
  font-family: var(--font-serif-en);
  font-size: 11px;
  letter-spacing: 0.35em;
  color: var(--accent-gold);
  font-style: italic;
  margin-top: 1rem;
}
.footer-desc {
  font-family: var(--font-serif-jp);
  font-size: 12px;
  line-height: 2.2;
  letter-spacing: 0.1em;
  color: var(--ink-tertiary);
  margin-top: 1.25rem;
}
.footer h4 {
  font-family: var(--font-serif-en);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--accent-gold);
  font-style: italic;
  margin-bottom: 1rem;
  font-weight: 400;
}
.footer ul { list-style: none; }
.footer ul li {
  font-family: var(--font-serif-jp);
  font-size: 12px;
  line-height: 2.4;
  letter-spacing: 0.12em;
  color: var(--ink-secondary);
}
.footer ul li a {
  color: inherit;
  text-decoration: none;
}
.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 1.5rem;
  border-top: 0.5px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-family: var(--font-serif-en);
  font-size: 10px;
  letter-spacing: 0.25em;
  color: var(--ink-muted);
  font-style: italic;
}

/* ============================================== */
/* RESPONSIVE                                     */
/* ============================================== */
@media (min-width: 768px) {
  body { padding-bottom: 0; }
  .header { padding: 1.5rem 2.5rem; }
  .logo { font-size: 14px; }
  .logo .en { font-size: 10px; }
  .hamburger { display: none; }
  .fixed-reserve { display: none; }
  .desktop-nav {
    display: flex !important;
    gap: 2.5rem;
    align-items: center;
  }
  .desktop-nav a {
    font-family: var(--font-sans-jp);
    font-size: 12px;
    letter-spacing: 0.3em;
    color: inherit;
    text-decoration: none;
    transition: color 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
  }
  .desktop-nav a .nav-en {
    font-family: var(--font-sans-jp);
    font-size: 12px;
    letter-spacing: 0.3em;
  }
  .desktop-nav a .nav-jp {
    font-family: var(--font-serif-jp);
    font-size: 9.5px;
    letter-spacing: 0.18em;
    color: var(--accent-gold);
    font-weight: 400;
  }
  .desktop-nav a:hover { color: var(--accent-gold); }
  .desktop-nav .header-reserve {
    flex-direction: row;
    padding: 0.65rem 1.5rem;
    background: var(--accent-gold);
    border: 1px solid var(--accent-gold);
    color: var(--bg-main);
    letter-spacing: 0.35em;
    font-family: var(--font-serif-en);
    font-size: 12px;
    font-style: italic;
    transition: all 0.4s var(--ease);
    margin-left: 0.5rem;
  }
  .desktop-nav .header-reserve:hover {
    background: var(--ink-primary);
    border-color: var(--ink-primary);
    color: var(--accent-gold-bright);
    transform: translateY(-1px);
  }
  .menu-overlay { display: none; }

  .page-header { padding: 12rem 4rem 6rem; }
  .section { padding: 8rem 4rem; }

  .footer { padding: 5rem 4rem 2rem; }
  .footer-grid {
    flex-direction: row;
    gap: 3rem;
  }
  .footer-grid > div:first-child { flex: 1.5; }
  .footer-grid > div { flex: 1; }
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}