/* ============================================================
   common.css — 全ページ共通スタイル
   目次:
     1. Variables      変数
     2. Base / Reset   ベース・リセット
     3. Utilities      共通ユーティリティ（フェード）
     4. Header         ヘッダー
     5. Hamburger      ハンバーガーボタン
     6. Nav            ナビ（背景 / パネル）
     7. Footer         フッター
     8. Responsive     共通レスポンシブ（〜760px）
     9. Reduced motion アニメーション抑制
   ============================================================ */

/* ─── 1. Variables ─── */
:root{
  --washi:#F2EFE7;
  --sumi:#23211C;
  --ai:#2E4860;
  --kobi:#8A7355;
  --usuzumi:#6E6A60;
  --line:#D8D2C4;
  --ai-lt:#E6ECF2;
  --header-h:68px;
}

/* ─── 2. Base / Reset ─── */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{
  font-family:'Shippori Mincho',serif;
  background:var(--washi);
  color:var(--sumi);
  line-height:2;
  letter-spacing:.08em;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* ─── 3. Utilities: scroll fade ─── */
.fade-up{
  opacity:0;
  transform:translateY(28px);
  transition:opacity .7s ease, transform .7s ease;
}
.fade-up.visible{opacity:1;transform:translateY(0)}
.delay-1{transition-delay:.1s}
.delay-15{transition-delay:.15s}
.delay-2{transition-delay:.2s}
.delay-3{transition-delay:.3s}

/* ─── 4. Header ─── */
header{
  position:fixed;top:0;left:0;right:0;z-index:203;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  padding:1.4rem 2.2rem;
  background:transparent;
  transition:background .35s,transform .35s,border-color .35s;
  border-bottom:1px solid transparent;
}
header.header-hidden{
  transform:translateY(-100%);
  pointer-events:none;
}
header.scrolled{
  background:var(--washi);
  border-bottom-color:var(--sumi);
}

.logo{
  text-align:center;
  color:var(--washi);
  font-family:'Cormorant Garamond',serif;
  font-size:1.05rem;letter-spacing:.28em;text-transform:uppercase;
  opacity:0;
  pointer-events:none;
  transition:color .35s,opacity .35s;
}
.logo small{
  display:block;font-family:'Shippori Mincho',serif;
  font-size:.62rem;letter-spacing:.45em;margin-top:.2em;opacity:.85;
}
.logo-img{display:block;height:32px;width:auto}
header.scrolled .logo{color:var(--sumi);opacity:1;pointer-events:auto}

.nav-desk{
  display:flex;gap:1rem;align-items:center;
  justify-self:start;
}
.nav-desk a{
  color:var(--washi);font-size:.78rem;letter-spacing:.22em;opacity:.9;
  transition:opacity .2s,color .35s;
}
.nav-desk a:hover{opacity:.6}
header.scrolled .nav-desk a{color:var(--sumi);opacity:1}
header.scrolled .nav-desk a:hover{opacity:.6}

.header-right{
  position:fixed;top:0;right:0;
  z-index:206;
  display:flex;align-items:center;gap:1rem;
  padding:0 2.2rem;
  transition:transform .35s,opacity .35s;
}
.header-right.header-hidden{
  transform:translateY(-100%);
  pointer-events:none;
}
.btn-reserve{
  background-color:rgba(242,239,231,.3);
  border-radius:100px;
  padding:.15em 1.5em;color:var(--washi);
  font-family:'Cormorant Garamond',serif;
  font-size:.78rem;
  white-space:nowrap;
  transition:background .3s,color .3s,border-color .3s;
}
.btn-reserve:hover{background-color:rgba(242,239,231,.6)}
.header-right.scrolled .btn-reserve{
  background-color:var(--sumi);
  color:var(--washi);
}
.header-right.scrolled .btn-reserve:hover{background-color:var(--ai)}

/* ─── 5. Hamburger (2 lines) ─── */
.hamburger{
  display:flex;flex-direction:column;gap:6px;
  background:none;border:none;cursor:pointer;padding:.4rem;
}
.hamburger span{
  display:block;width:24px;height:1px;
  background:transparent;position:relative;
  transition:transform .3s;
}
.hamburger span::before,
.hamburger span::after{
  content:'';position:absolute;inset:0;
}
.hamburger span::before{
  background:var(--washi);
  transform-origin:right center;
  transition:transform .28s ease,background .3s;
}
.hamburger span::after{
  background:var(--washi);
  transform-origin:left center;
  transform:scaleX(0);
  transition:transform .28s ease,background .3s;
}
.header-right.scrolled .hamburger span::before,
.header-right.scrolled .hamburger span::after{background:var(--sumi)}
/* nav-open は scrolled より後ろに置き、スクロール有無に関わらず最上部の色で上書き */
.header-right.nav-open .btn-reserve{background-color:rgba(242,239,231,.3);color:var(--washi)}
.header-right.nav-open .btn-reserve:hover{background-color:rgba(242,239,231,.6)}
.header-right.nav-open .hamburger span::before,
.header-right.nav-open .hamburger span::after{background:var(--washi)}
.hamburger:not(.open):hover span::before{transform:scaleX(0)}
.hamburger:not(.open):hover span::after{
  transform:scaleX(1);
  transition:transform .28s ease .28s,background .35s;
}
.hamburger:not(.open):hover span:nth-child(2)::before{
  transition:transform .28s ease .13s,background .35s;
}
.hamburger:not(.open):hover span:nth-child(2)::after{
  transform:scaleX(1);
  transition:transform .28s ease .41s,background .35s;
}
.hamburger.open span:nth-child(1){transform:translateY(3.5px) rotate(45deg)}
.hamburger.open span:nth-child(2){transform:translateY(-3.5px) rotate(-45deg)}

/* ─── 6. Nav backdrop ─── */
.nav-backdrop{
  position:fixed;inset:0;z-index:204;
  background:rgba(0,0,0,.3);
  opacity:0;pointer-events:none;
  transition:opacity .45s cubic-bezier(.4,0,.2,1);
}
.nav-backdrop.open{opacity:1;pointer-events:all}

/* ─── 6. Nav panel ─── */
.nav-mobile{
  position:fixed;top:0;right:0;bottom:0;
  width:28vw;min-width:300px;
  z-index:205;
  background:var(--sumi);
  display:flex;flex-direction:column;
  align-items:center;
  padding:7rem 2.8rem 3.5rem;
  gap:0;
  overflow-y:auto;
  transform:translateX(100%);
  pointer-events:none;
  visibility:hidden;
  transition:transform .45s cubic-bezier(.4,0,.2,1), visibility 0s linear .45s;
}
.nav-mobile.open{
  transform:translateX(0);
  pointer-events:all;
  visibility:visible;
  box-shadow:-4px 0 40px rgba(0,0,0,.22);
  transition:transform .45s cubic-bezier(.4,0,.2,1), visibility 0s linear 0s;
}

/* Nav panel — logo */
.nav-mobile-logo{
  font-family:'Cormorant Garamond',serif;
  color:var(--washi);
  font-size:1.05rem;letter-spacing:.28em;text-transform:uppercase;
  margin-bottom:3rem;flex-shrink:0;text-align:center;
}
.nav-mobile-logo small{
  display:block;font-family:'Shippori Mincho',serif;
  font-size:.62rem;letter-spacing:.45em;margin-top:.2em;opacity:.55;
}

/* Nav panel — list */
.nav-mobile-list{
  list-style:none;width:100%;
}
.nav-mobile-list li{
  border-top:1px solid rgba(216,210,196,.1);
}
.nav-mobile-list li:last-child{
  border-bottom:1px solid rgba(216,210,196,.1);
}
.nav-mobile-list a{
  display:flex;flex-direction:row;
  justify-content:space-between;align-items:center;
  padding:1.5rem 0;
  color:var(--washi);gap:.5rem;
  transition:opacity .2s;
}
.nav-mobile-list a:hover{opacity:.5}
.nav-m-en{
  font-family:'Cormorant Garamond',serif;
  font-size:.62rem;letter-spacing:.45em;text-transform:uppercase;
  color:rgba(242,239,231,.35);line-height:1;
  order:2;
}
.nav-m-ja{
  font-size:.94rem;font-weight:500;letter-spacing:.22em;line-height:1.2;
  order:1;
}

/* Nav panel — footer */
.nav-mobile-foot{
  width:100%;margin-top:3rem;flex-shrink:0;
  display:flex;flex-direction:column;gap:2rem;
}
.nav-mobile-sns{
  font-family:'Zen Kaku Gothic New',sans-serif;
  font-size:.66rem;letter-spacing:.18em;color:rgba(242,239,231,.35);
}
.nav-mobile-ig{
  display:inline-flex;justify-content:center;align-items:center;gap:.55rem;
  color:rgba(242,239,231,.52);transition:color .2s;
  text-decoration:none;
}
.nav-mobile-ig:hover{color:var(--washi)}
.nav-mobile .btn-nav-reserve{
  display:inline-block;
  border:1px solid rgba(242,239,231,.25);
  width:100%;
  padding:.82em 2rem;font-size:.74rem;
  color:rgba(242,239,231,.78);background:transparent;
  text-align:center;
  border-radius:100px;letter-spacing:.22em;
  transition:background .3s,border-color .3s,color .3s;
}
.nav-mobile .btn-nav-reserve:hover{
  background:rgba(242,239,231,.07);
  border-color:rgba(242,239,231,.48);
  color:var(--washi);
}

/* ─── 7. Footer ─── */
footer{
  background:var(--sumi);
  padding:6rem 2rem;
}
.footer-inner{
  max-width:1280px;margin:0 auto;
  display:grid;grid-template-columns:auto 1fr auto;
  gap:0 4.5rem;align-items:start;
}
footer .logo{opacity:1;pointer-events:auto;color:var(--washi)}
footer .logo-img{height:38px}
.footer-info{
  font-family:'Zen Kaku Gothic New',sans-serif;
  font-size:.78rem;letter-spacing:.05em;
  line-height:2.3;color:#B7B1A2;
}
.footer-info p{margin-bottom:.75rem}
.footer-info a{color:inherit;transition:color .2s}
.footer-info a:hover{color:var(--washi)}
.footer-right{display:flex;flex-direction:column;align-items:flex-end;gap:2rem}
.footer-sns{display:flex;align-items:center;gap:1rem}
.footer-sns-icon{
  display:grid;place-content:center;
  width:34px;height:34px;border-radius:50%;
  border:1px solid rgba(242,239,231,.35);color:#B7B1A2;
  transition:border-color .2s,color .2s;
}
.footer-sns-icon:hover{border-color:var(--washi);color:var(--washi)}
.footer-reserve-btn{
  display:inline-flex;align-items:center;
  background:var(--washi);color:var(--sumi);
  border-radius:2em;padding:.5em 1.5em;
  font-family:'Cormorant Garamond',serif;
  font-size:.82rem;
  transition:background .25s;
}
.footer-reserve-btn:hover{background:#DAD4C4}
.footer-nav{
  display:flex;flex-wrap:wrap;justify-content:flex-end;gap:.35rem 1.5rem;
}
.footer-nav a{
  font-family:'Cormorant Garamond',serif;
  font-size:.8rem;letter-spacing:.18em;color:#B7B1A2;
  transition:color .2s;
}
.footer-nav a:hover{color:var(--washi)}
.footer-sub{display:flex;flex-direction:column;align-items:flex-end;gap:.5rem}
.footer-sub-nav{display:flex;gap:1.2rem;flex-wrap:wrap;justify-content:flex-end}
.footer-sub-nav a{
  font-family:'Zen Kaku Gothic New',sans-serif;
  font-size:.68rem;letter-spacing:.1em;color:#8F8A7C;
  transition:color .2s;
}
.footer-sub-nav a:hover{color:var(--washi)}
.footer-copy{
  font-family:'Zen Kaku Gothic New',sans-serif;
  font-size:.68rem;letter-spacing:.06em;color:#8F8A7C;
}

/* ─── 8. Responsive（共通チャーム：〜760px）─── */
@media(max-width:760px){
  header{padding:1rem 1.2rem}
  .logo{font-size:.78rem;white-space:nowrap}
  .logo small{font-size:.46rem}
  .logo-img{height:27px}
  .nav-desk{display:none}
  .header-right{padding:0 .8rem;gap:.6rem}
  .btn-reserve{font-size:.702rem;padding:.135em 1.35em}
  .nav-mobile{width:74vw;min-width:unset;padding:6.3rem 2rem 3rem;align-items:center}
  .nav-mobile-logo{font-size:.78rem;white-space:nowrap;margin-bottom:2.7rem;text-align:center}
  .nav-mobile-logo small{font-size:.46rem}
  .nav-mobile-list{max-width:320px}
  .nav-mobile-foot{align-items:center;text-align:center;margin-top:2.7rem;gap:1.8rem}
  .nav-m-ja{font-size:.84rem}
  .nav-m-en{font-size:.56rem}
  .nav-mobile-list a{padding:1.3rem 0}
  .nav-mobile-sns{font-size:.6rem}
  .nav-mobile .btn-nav-reserve{font-size:.68rem;padding:.7em 1.5rem}
  /* footer */
  footer{padding:4rem 1.5rem}
  .footer-inner{grid-template-columns:1fr;gap:2.5rem}
  .footer-info{font-size:.7rem}
  .footer-right{align-items:flex-start;margin-top:-2rem}
  .footer-nav{justify-content:flex-start}
  .footer-sub{align-items:flex-start}
  .footer-sub-nav{justify-content:flex-start}
  .footer-sns,.footer-nav{display:none}
  footer .logo{font-size:1rem}
  footer .logo small{font-size:.58rem}
  footer .logo-img{height:32px}
}

/* ─── 9. Reduced motion ─── */
@media(prefers-reduced-motion:reduce){
  .fade-up{transition:none}
}