/* 下層ページのヘッダーとハンバーガーメニュー（_inc/header.php・js/menu.js）
   見た目はトップ（css/style.css）に合わせる */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  padding-top: 124px;
  padding-bottom: 20px;
}

/* 中身が短いページでも、フッターは必ず画面の下に置く */
.wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
}
.wrap > * { min-width: 0; }
.wrap > footer { margin-top: auto; padding-top: 72px; }

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 40px;
  background: rgba(5,8,16,0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.site-header .logo { color: #fff; line-height: 1.2; }
.site-header .logo a { color: inherit; text-decoration: none; }
.logo-en {
  display: block;
  font-family: 'Cormorant Garamond', serif;
  font-size: 30px;
  font-weight: 300;
  letter-spacing: 0.02em;
}
.logo-jp {
  display: block;
  margin-top: 2px;
  font-family: 'Noto Serif JP', 'Cormorant Garamond', serif;
  font-size: 11px;
  font-weight: 300;
  letter-spacing: 0.18em;
  opacity: 0.8;
}
.header-right { display: flex; align-items: center; gap: 32px; }
.header-nav { display: flex; gap: 24px; }
.header-nav a {
  transition: color 0.2s, opacity 0.2s, text-shadow 0.2s;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  letter-spacing: 0.2em;
  text-align: center;
  text-transform: uppercase;
  text-decoration: none;
  color: #fff;
  opacity: 0.8;
  transition: opacity 0.3s;
}
.header-nav a:hover,
.header-nav a[aria-current="page"] { opacity: 1; }
.header-nav a[aria-current="page"] { color: var(--accent); }
.site-header .link-ja,
.site-menu .link-ja {
  display: block;
  margin-top: 3px;
  font-family: 'Noto Serif JP', serif;
  font-size: 10px;
  font-weight: 300;
  letter-spacing: 0.1em;
  text-align: center;
  text-transform: none;
  opacity: 0.8;
}

.menu-btn {
  position: relative;
  width: 32px;
  height: 32px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
}
.menu-btn span {
  position: absolute;
  left: 4px;
  right: 4px;
  height: 1px;
  background: #fff;
  transition: transform 0.35s ease, opacity 0.25s ease, top 0.35s ease, background 0.2s, box-shadow 0.2s;
}
/* ハンバーガーのアイコンもホバーで黄色に */
.menu-btn:hover span,
.menu-btn:focus-visible span {
  background: #f3cd6e;
  box-shadow: 0 0 8px rgba(232, 185, 74, 0.7);
}
.menu-btn:focus-visible { outline: none; }
.menu-btn span:nth-child(1) { top: 9px; }
.menu-btn span:nth-child(2) { top: 16px; }
.menu-btn span:nth-child(3) { top: 23px; }
.menu-btn[aria-expanded="true"] span:nth-child(1) { top: 16px; transform: rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { top: 16px; transform: rotate(-45deg); }

/* ヘッダー・メニュー・パンくずのホバーは黄色で強調（プログレスバーの章リンクと同じ色） */
.header-nav a:hover,
.header-nav a:focus-visible,
.site-menu a:hover,
.site-menu a:focus-visible,
.crumbs a:hover,
.crumbs a:focus-visible {
  color: #f3cd6e;
  opacity: 1;
  text-shadow: 0 0 8px rgba(232, 185, 74, 0.6);
  outline: none;
}

/* 開いている間はヘッダーをメニューより前に出し、同じボタンで閉じられるようにする */
body.menu-open .site-header { z-index: 210; background: none; border-color: transparent; backdrop-filter: none; -webkit-backdrop-filter: none; }
body.menu-open .header-nav { visibility: hidden; }

.site-menu {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgba(5,8,16,0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  animation: site-menu-in 0.35s ease;
}
.site-menu[hidden] { display: none; }
.menu-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
  padding: 40px 48px;
}
.menu-nav,
.menu-sub { display: flex; flex-direction: column; align-items: center; }
.menu-nav { gap: 22px; }
.menu-nav a {
  transition: color 0.2s, opacity 0.2s, text-shadow 0.2s;
  font-family: 'Cormorant Garamond', serif;
  font-size: 40px;
  font-weight: 300;
  letter-spacing: 0.08em;
  text-align: center;
  text-decoration: none;
  color: #fff;
  opacity: 0.85;
}
.menu-nav .link-ja { margin-top: 2px; font-size: 13px; letter-spacing: 0.2em; opacity: 0.75; }
.menu-sub {
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 16px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.15);
}
.menu-sub a {
  transition: color 0.2s, opacity 0.2s, text-shadow 0.2s;
  padding: 12px 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-align: center;
  text-transform: uppercase;
  text-decoration: none;
  color: #fff;
  opacity: 0.65;
}
.site-menu a:hover,
.site-menu a:focus-visible { opacity: 1; outline: none; }
@keyframes site-menu-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .site-menu { animation: none; }
}

/* ページの最後、フッターの上に置く「上の階層へ戻る」ボタン */
.back-link { margin-top: auto; padding-top: 48px; text-align: center; }   /* 中身が短いページでは、フッターのすぐ上まで下げる */
.back-link + footer { margin-top: 0; padding-top: 48px; }
.back-btn {
  display: inline-block;
  min-width: 200px;
  padding: 14px 28px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--ink-line);
  border-radius: 2px;
  transition: background 0.3s, color 0.3s, border-color 0.3s;
}
.back-btn:hover,
.back-btn:focus-visible {
  color: var(--bg);
  background: var(--ink);
  border-color: var(--ink);
  outline: none;
}

@media (max-width: 768px) {
  body { padding-top: 96px; }
  .site-header { padding: 12px 18px; }
  .logo-en { font-size: 22px; letter-spacing: 0.04em; }
  .logo-jp { font-size: 9px; letter-spacing: 0.15em; }
  .header-nav { display: none; }
  .menu-inner { padding: 32px 24px; }
  .menu-nav a { font-size: 32px; }
  .menu-sub { gap: 2px 8px; }
  .menu-sub a { font-size: 11px; }
}