/* ==========================================================
   岡野大嗣 公式サイト 共有スタイル（下層ページ用）
   トップページ（index.html）はヒーロー専用のスタイルを
   ページ内に持つため、このファイルは下層ページだけが読み込む。
   ========================================================== */

:root {
  --bg-cream: #FAF6F0;
  --bg-warm: #F3EDE4;
  --text-main: #3E3530;
  --text-light: #6B5F55;
  --text-muted: #8B8077;
  --accent: #B47259;
  --accent-soft: #E8BFB1;
  --border: #DDD5CB;
  --white: #FFFCF8;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Zen Kaku Gothic New', 'Hiragino Sans', 'Yu Gothic', sans-serif;
  font-weight: 400;
  color: var(--text-main);
  background-color: var(--white);
  line-height: 2.0;
  letter-spacing: 0.04em;
  -webkit-font-smoothing: antialiased;
}

/* ── ヘッダー ── */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255, 252, 248, 0.92);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
nav {
  max-width: 1100px; margin: 0 auto; padding: 0 2rem;
  display: flex; justify-content: space-between; align-items: center;
  height: 72px;
}
.site-name {
  font-family: 'Shippori Mincho', serif;
  font-size: 1.1rem; font-weight: 500; letter-spacing: 0.12em;
  color: var(--text-main); text-decoration: none; transition: color 0.3s;
  display: inline-flex; align-items: baseline; gap: 0.7rem;
}
.site-name-en {
  font-family: 'Zen Kaku Gothic New', sans-serif;
  font-size: 0.68rem; font-weight: 300; letter-spacing: 0.05em;
  color: var(--text-muted);
}
.site-name:hover { color: var(--accent); }
.nav-links {
  display: flex; gap: 1.4rem; list-style: none; align-items: center;
}
.nav-links a {
  font-size: 0.82rem; letter-spacing: 0.08em;
  color: var(--text-light); text-decoration: none; transition: color 0.3s;
}
.nav-links a:hover { color: var(--accent); }
.nav-links a[aria-current="page"] { color: var(--text-main); }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.hamburger span {
  width: 22px; height: 1px; background: var(--text-main);
  transition: transform 0.3s;
}

/* ── ページ共通レイアウト ── */
main.page {
  max-width: 1000px;
  margin: 0 auto;
  padding: 150px 2rem 5rem;
  min-height: 70vh;
}
.page-title {
  font-family: 'Shippori Mincho', serif;
  font-size: 1.5rem; font-weight: 500; letter-spacing: 0.18em;
  margin-bottom: 3rem;
  display: flex; align-items: center; gap: 1.2rem;
}
.page-title::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}
.section-label {
  font-size: 0.95rem; font-weight: 500; letter-spacing: 0.2em;
  color: var(--text-main);
  margin-top: 3rem; margin-bottom: 1.5rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 0.8rem;
}
.section-label::before {
  content: ''; width: 6px; height: 6px;
  background: var(--accent); border-radius: 50%; flex-shrink: 0;
}
.page-note {
  font-size: 0.82rem; color: var(--text-muted); margin-top: 2rem;
}

/* ── フッター ── */
footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 2rem 2rem;
  text-align: center;
}
.footer-sns {
  display: flex; justify-content: center; align-items: center;
  gap: 1.4rem; margin-bottom: 1.5rem;
}
.footer-sns a {
  color: var(--text-muted); text-decoration: none;
  font-size: 0.78rem; letter-spacing: 0.06em;
  display: inline-flex; align-items: center;
  transition: color 0.3s;
}
.footer-sns a:hover { color: var(--accent); }
.footer-sns svg { width: 16px; height: 16px; fill: currentColor; display: block; }
.footer-copy {
  font-size: 0.72rem; color: var(--text-muted); letter-spacing: 0.08em;
}

/* ── 著作一覧 ── */
.books-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4.5rem 4rem;
  margin-bottom: 3rem;
}
.book-card { text-align: left; }
a.book-card { text-decoration: none; color: inherit; display: block; }
.book-cover {
  width: 100%; aspect-ratio: 2 / 3;
  background: linear-gradient(to right, #E8DFD3 0%, #F0E8DC 8%, #F3EDE4 100%);
  border: 1px solid var(--border);
  border-left: 3px solid #C9BDAC;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1rem; position: relative; overflow: hidden;
  padding: 0.8rem 0.4rem;
  transition: transform 0.4s ease;
}
a.book-card:hover .book-cover { transform: translateY(-3px); }
.book-cover-title {
  writing-mode: vertical-rl;
  font-family: 'Zen Kaku Gothic New', sans-serif;
  font-size: 0.82rem; font-weight: 500;
  letter-spacing: 0.05em; line-height: 1.6;
  color: var(--text-main);
  max-height: 100%; text-align: start;
}
.book-title {
  margin: 0 0 0.35rem;
  font-family: 'Zen Kaku Gothic New', sans-serif;
  font-size: 0.95rem; font-weight: 700;
  letter-spacing: 0.03em; line-height: 1.5;
  color: var(--text-main);
}
.book-card-meta { font-size: 0.78rem; color: var(--text-muted); line-height: 1.7; margin: 0; }
.work-item { margin-bottom: 1.6rem; }
.work-title { font-size: 0.95rem; font-weight: 500; letter-spacing: 0.04em; }
.work-meta { font-size: 0.78rem; color: var(--text-muted); }
.work-note { font-size: 0.82rem; color: var(--text-light); }

/* ── 書籍 個別ページ ── */
.book-detail-head {
  display: grid; grid-template-columns: 280px 1fr; gap: 3rem;
  align-items: start; margin-bottom: 3rem;
}
.book-detail-covers { display: flex; flex-direction: column; gap: 0.8rem; }
.book-detail-cover-main {
  aspect-ratio: 2 / 3;
  background: linear-gradient(to right, #E8DFD3 0%, #F0E8DC 8%, #F3EDE4 100%);
  border: 1px solid var(--border);
  border-left: 3px solid #C9BDAC;
  display: flex; align-items: center; justify-content: center;
  padding: 1rem 0.6rem;
}
.book-detail-thumbs { display: flex; gap: 0.8rem; }
.book-detail-thumb {
  flex: 1; aspect-ratio: 1 / 1;
  background: var(--bg-warm); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.68rem; color: var(--text-muted);
}
.book-detail-title {
  font-family: 'Shippori Mincho', serif;
  font-size: 1.4rem; font-weight: 500; letter-spacing: 0.08em;
  line-height: 1.7; margin-bottom: 0.6rem;
}
.book-detail-meta { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 1.8rem; }
.book-detail-lede { font-size: 0.9rem; color: var(--text-light); }
.book-detail-body { max-width: 680px; margin-top: 3rem; }
.book-detail-body p {
  font-size: 0.92rem; color: var(--text-light); line-height: 2.2;
}
.book-detail-body p + p { margin-top: 1.4rem; }
.book-buy {
  display: inline-block; margin-top: 1.6rem;
  font-size: 0.82rem; letter-spacing: 0.08em;
  color: var(--accent); text-decoration: none;
  border: 1px solid var(--accent-soft);
  padding: 0.55rem 1.4rem; border-radius: 2px;
  transition: background 0.3s, color 0.3s;
}
.book-buy:hover { background: var(--accent); color: var(--white); }
.book-links { list-style: none; }
.book-links li { margin-bottom: 0.4rem; }
.book-links a {
  font-size: 0.85rem; color: var(--text-light);
  text-decoration: underline; text-underline-offset: 4px;
}
.book-links a:hover { color: var(--accent); }
.book-pager {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 4rem; padding-top: 2rem; border-top: 1px solid var(--border);
  gap: 1rem;
}
.book-pager a {
  font-size: 0.82rem; color: var(--text-light); text-decoration: none;
  max-width: 42%;
}
.book-pager a:hover { color: var(--accent); }
.book-pager .to-list { font-size: 0.78rem; color: var(--text-muted); }

/* ── NEWS ── */
.news-search {
  display: flex; align-items: center; gap: 0.6rem;
  max-width: 480px; margin: 0 auto 3rem;
  border: 1px solid var(--border); border-radius: 2px;
  background: var(--white); padding: 0.6rem 1rem;
}
.news-search input {
  flex: 1; border: none; outline: none; background: transparent;
  font-family: inherit; font-size: 0.85rem; color: var(--text-main);
  letter-spacing: 0.04em;
}
.news-search input::placeholder { color: var(--text-muted); }
.news-search .search-mark {
  font-size: 0.8rem; color: var(--text-muted);
}
.news-list { list-style: none; }
.news-item {
  padding: 1.5rem 0; border-bottom: 1px solid var(--border);
}
.news-item-head {
  display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap;
  margin-bottom: 0.3rem;
}
.news-item-date {
  font-size: 0.75rem; color: var(--text-muted); letter-spacing: 0.06em;
}
.news-item-cat {
  font-size: 0.68rem; letter-spacing: 0.1em;
  color: var(--accent); border: 1px solid var(--accent-soft);
  padding: 0.05rem 0.6rem; border-radius: 999px;
}
.news-item-title { font-size: 0.95rem; font-weight: 500; }
.news-item-body { font-size: 0.85rem; color: var(--text-light); }
.news-empty {
  text-align: center; color: var(--text-muted); font-size: 0.85rem;
  padding: 3rem 0; display: none;
}

/* ── 講座・イベント ── */
.class-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.class-card {
  background: var(--bg-warm);
  border-left: 2px solid var(--accent);
  padding: 1.8rem 1.5rem;
  position: relative;
}
.class-card::before {
  content: ''; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(168,158,149,0.04) 1px, transparent 1px);
  background-size: 100% 1.8em; background-position: 0 1em;
  pointer-events: none;
}
.class-card-title { font-size: 1rem; font-weight: 500; margin-bottom: 0.8rem; letter-spacing: 0.1em; position: relative; }
.class-card-detail { font-size: 0.82rem; color: var(--text-light); line-height: 1.9; position: relative; }
.class-note { margin-top: 2rem; font-size: 0.85rem; color: var(--text-light); text-align: center; }

/* ── プロフィール ── */
.profile-body { display: flex; gap: 3rem; align-items: flex-start; }
.profile-photo {
  flex-shrink: 0; width: 200px; height: 260px;
  background: var(--bg-warm); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; color: var(--text-muted);
}
.profile-text { flex: 1; font-size: 0.92rem; color: var(--text-light); }

/* ── お問い合わせ ── */
.contact-body { text-align: center; padding: 1rem 0 2rem; font-size: 0.92rem; }
.contact-email {
  display: inline-block; margin: 1.6rem 0 2rem;
  font-family: 'Shippori Mincho', serif;
  font-size: 1.05rem; letter-spacing: 0.06em;
  color: var(--accent); text-decoration: none;
  border-bottom: 1px solid var(--accent-soft);
  padding-bottom: 2px;
}
.contact-email:hover { border-bottom-color: var(--accent); }

/* ── 展示室 ── */
.exhibit-gate { text-align: center; padding: 2rem 0 3rem; }
.exhibit-gate-lede { font-size: 0.92rem; color: var(--text-light); margin-bottom: 2.4rem; }
.ticket-button {
  display: inline-block;
  font-size: 0.88rem; letter-spacing: 0.1em;
  color: var(--white); background: var(--accent);
  text-decoration: none;
  border: none; font-family: inherit; cursor: pointer;
  padding: 0.8rem 2.4rem; border-radius: 2px;
  transition: opacity 0.3s;
}
.ticket-button:hover { opacity: 0.85; }
.exhibit-gate-note { font-size: 0.75rem; color: var(--text-muted); margin-top: 1.6rem; }
.exhibit-entrance { text-align: center; padding: 2rem 0 3rem; }

/* ── 展示室：部屋 ──
   部屋のページはグローバルメニューを持たない。
   ヒーロー領域は画面の上端いっぱいまで広がり、短歌のステージ
   （トップページの .hero-stage と同じ寸法）を縦中央に置く。 */
main.room-page {
  max-width: none;
  padding: 0;
  min-height: 100vh;
}
.room-gate {
  min-height: 100vh;
  min-height: 100svh;
  display: flex; flex-direction: column;
  justify-content: center; align-items: center;
  padding: 2rem;
}
.room-gate[hidden] { display: none; }
.room-hero {
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  display: flex; flex-direction: column;
  justify-content: center; align-items: center;
  padding: 2rem;
  position: relative; overflow: hidden;
}
.room-stage {
  position: relative; z-index: 1;
  width: min(880px, 94vw);
  height: min(76svh, 820px);
  min-height: 480px;
  overflow: hidden;
}

/* 入口への控えめな導線。普段は隠れていて、
   画面左上の隅にマウスを寄せたときだけ現れる */
.exit-link {
  position: fixed; top: 0; left: 0; z-index: 60;
  padding: 1.1rem 1.5rem; /* 隅の当たり判定を兼ねる */
  font-size: 0.75rem; letter-spacing: 0.1em;
  color: var(--text-muted); text-decoration: none;
  opacity: 0;
  transition: opacity 0.4s ease, color 0.3s;
}
.exit-link:hover, .exit-link:focus-visible { opacity: 1; color: var(--text-light); }
@media (hover: none) {
  /* ホバーの効かない環境では、常にうっすらと見せておく */
  .exit-link { opacity: 0.5; }
}
.room-poems { position: absolute; inset: 0; z-index: 1; }

/* 短歌：トップページのヒーローと同じ大きさを基準に、
   ステージの天地センターに置く。
   歌がステージに収まらないときだけ、JSが --fit で縮める */
.room-poem {
  position: absolute;
  top: var(--y, 50%);
  left: var(--x, 50%);
  transform: translate(-50%, -50%);
  margin: 0;
  writing-mode: vertical-rl;
  font-family: 'Shippori Mincho', serif;
  --fs: 0.88rem;
  font-size: calc(var(--fs) * var(--fit, 1));
  font-weight: 500;
  letter-spacing: 0.12em;
  line-height: 1.7;
  color: var(--text-main);
  white-space: nowrap;
}
.room-char {
  display: inline-block;
  opacity: 0;
  filter: blur(8px);
  transform: translateY(10px);
  transition: opacity 3s ease, filter 3s ease,
              transform 3s cubic-bezier(0.2, 0.6, 0.2, 1);
  transition-delay: var(--d, 0s);
}
.room-poem.showing .room-char {
  opacity: 1;
  filter: blur(0);
  transform: translateY(0);
}
.room-poem.fading .room-char {
  color: transparent;
  transition: color 6.5s ease;
  transition-delay: 0s;
}

/* 10首を見終えたあとの一覧 */
.room-recap {
  position: absolute; inset: 0;
  display: flex; align-items: flex-start; justify-content: flex-start;
  gap: clamp(0.8rem, 2vw, 1.6rem);
  padding: 5% 1.5rem 0;
  overflow-x: auto;
}
/* 一首ずつ、時間をかけて浮かび上がる（遅延はJSが一首ごとに指定） */
.room-recap-poem { opacity: 0; transition: opacity 3.4s ease; }
.room-recap.showing .room-recap-poem { opacity: 1; }
/* 収まるときは中央に寄り、溢れたときは左右にスクロールできる */
.room-recap-poem:first-child { margin-left: auto; }
.room-recap-poem:last-child { margin-right: auto; }
.room-recap-poem {
  writing-mode: vertical-rl;
  font-family: 'Shippori Mincho', serif;
  font-size: min(0.8rem, 1.5svh);
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--text-light);
  white-space: nowrap;
  margin: 0;
  flex-shrink: 0;
}

/* ── 部屋ごとの背景。あからさまにしない ── */
.room-aurora {
  position: absolute; inset: 0;
  overflow: hidden;
  pointer-events: none;
}

/* 第一室〈風鈴〉：カーテンが風をはらんで、ふくらんではしぼむ。
   模様の平行移動はやめ、縦の襞を9枚のひだ要素で作る。
   各ひだは「陰・腹（明るい面）・陰」のグラデーションを持ち、
   横方向に大きく伸縮する。位相を2.4秒ずつずらすことで、
   ふくらみの波がカーテンを渡っていくように見せる。
   奥には自然光の層があり、はらむ周期に合わせてはっきり明るくなる */
.aurora-kaze {
  background: linear-gradient(100deg,
    rgba(203,217,224,0.30) 0%,
    rgba(234,229,209,0.24) 34%,
    rgba(189,196,219,0.26) 68%,
    rgba(210,222,215,0.26) 100%);
}
.kaze-sun {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 68% 78% at 40% 26%,
      rgba(255,244,210,0.95) 0%, rgba(255,244,210,0) 68%),
    radial-gradient(ellipse 40% 52% at 74% 48%,
      rgba(255,240,204,0.55) 0%, rgba(255,240,204,0) 62%);
  opacity: 0.10;
  animation: kaze-sun 42s ease-in-out infinite;
  will-change: opacity;
}
.kaze-curtain {
  position: absolute; inset: 0;
  transform-origin: 50% 0%;
  animation: kaze-hem 21s ease-in-out infinite;
  will-change: transform;
}
.kaze-fold {
  position: absolute; top: -4%; bottom: -4%;
  left: calc(var(--i) * 11.3% - 5%);
  width: 16%;
  background: linear-gradient(90deg,
    rgba(112,126,152,0)    0%,
    rgba(112,126,152,0.20) 18%,
    rgba(255,253,246,0.34) 46%,
    rgba(140,152,178,0.16) 78%,
    rgba(140,152,178,0)    100%);
  transform-origin: 50% 0%;
  animation: kaze-fold 21s ease-in-out infinite;
  animation-delay: calc(var(--i) * -2.4s);
  will-change: transform;
}
/* ひだ：はらむと大きくひらき（1.45倍）、吐くと締まる（0.8倍）。
   陰と腹の幅が変わることで、布の厚みの変化として見える */
@keyframes kaze-fold {
  0%, 100% { transform: scaleX(1)    translateX(0); }
  35%      { transform: scaleX(1.45) translateX(2.2%); }
  55%      { transform: scaleX(1.28) translateX(1.4%); }
  75%      { transform: scaleX(0.80) translateX(-1.2%); }
}
/* 裾のしなり。上端は留まったまま、全体がわずかに傾ぐ */
@keyframes kaze-hem {
  0%, 100% { transform: skewX(0deg); }
  50%      { transform: skewX(0.9deg); }
}
/* 自然光：42秒に二度、一度目ははっきりと、二度目は控えめに差す */
@keyframes kaze-sun {
  0%, 100% { opacity: 0.10; }
  12%      { opacity: 0.16; }
  22%      { opacity: 0.72; }
  32%      { opacity: 0.20; }
  56%      { opacity: 0.12; }
  67%      { opacity: 0.42; }
  79%      { opacity: 0.13; }
}

/* 第二室〈海〉：淡い青の面に、白波の筋が寄せては返す */
.umi-band {
  position: absolute; top: 0; left: 0;
  width: 200%; height: 100%;
  background: linear-gradient(180deg,
    rgba(210,232,236,0.55) 0%,
    rgba(166,206,220,0.55) 45%,
    rgba(120,168,196,0.55) 100%);
  animation: band-slide 84s linear infinite;
}
.umi-foam {
  position: absolute; top: 0; left: 0;
  width: 200%; height: 100%;
  background:
    repeating-linear-gradient(4deg,
      rgba(255,255,255,0)    0px,
      rgba(255,255,255,0)   58px,
      rgba(255,255,255,0.13) 72px,
      rgba(255,255,255,0)    88px,
      rgba(255,255,255,0)   220px),
    repeating-linear-gradient(-3deg,
      rgba(255,255,255,0)    0px,
      rgba(255,255,255,0)   132px,
      rgba(255,255,255,0.09) 150px,
      rgba(255,255,255,0)   168px,
      rgba(255,255,255,0)   360px);
  animation: band-slide 22s linear infinite,
             band-breathe-soft 9s ease-in-out infinite;
}

/* 第三室〈木漏れ日〉：地面に落ちた葉陰と枝の揺れ。
   はっきり緑とわかる影の粒と、暖色の光の粒を、
   周期の異なる明滅（11〜37秒、互いに割り切れない長さ）で重ねる。
   周期が揃わないため、組み合わせは不規則に移ろい続ける。
   形はすべて長い減衰の放射グラデーションで、輪郭は作らない */
.komorebi-ground {
  position: absolute; inset: 0;
  background: linear-gradient(168deg,
    rgba(209,203,190,0.44) 0%,
    rgba(198,190,174,0.50) 55%,
    rgba(190,181,163,0.54) 100%);
}
.k-shade, .k-glint {
  position: absolute; inset: 0;
  will-change: transform, opacity;
}
/* 影の粒：緑をはっきり感じる色で、ゆっくりめに揺らぐ */
.k-shade.s1 {
  background:
    radial-gradient(ellipse 24% 19% at 28% 30%,
      rgba(88,124,74,0.40) 0%, rgba(88,124,74,0) 68%),
    radial-gradient(ellipse 17% 14% at 52% 18%,
      rgba(94,128,78,0.32) 0%, rgba(94,128,78,0) 66%);
  animation: k-waver-a 23s ease-in-out infinite;
}
.k-shade.s2 {
  background:
    radial-gradient(ellipse 21% 17% at 68% 44%,
      rgba(84,120,72,0.38) 0%, rgba(84,120,72,0) 68%),
    radial-gradient(ellipse 14% 12% at 84% 26%,
      rgba(96,130,80,0.30) 0%, rgba(96,130,80,0) 64%);
  animation: k-waver-b 29s ease-in-out -9s infinite;
}
.k-shade.s3 {
  background:
    radial-gradient(ellipse 26% 20% at 38% 72%,
      rgba(90,124,76,0.36) 0%, rgba(90,124,76,0) 70%),
    radial-gradient(ellipse 16% 13% at 62% 84%,
      rgba(86,120,72,0.30) 0%, rgba(86,120,72,0) 64%);
  animation: k-waver-a 37s ease-in-out -17s infinite;
}
/* 光の粒：木々の隙間の明るみ。影より速く、細かくまたたく */
.k-glint.g1 {
  background:
    radial-gradient(ellipse 13% 10% at 44% 36%,
      rgba(255,248,216,0.50) 0%, rgba(255,248,216,0) 64%),
    radial-gradient(ellipse 9% 7% at 58% 54%,
      rgba(255,246,210,0.42) 0%, rgba(255,246,210,0) 60%);
  animation: k-glint-a 11s ease-in-out infinite;
}
.k-glint.g2 {
  background:
    radial-gradient(ellipse 11% 9% at 30% 56%,
      rgba(255,249,220,0.44) 0%, rgba(255,249,220,0) 62%),
    radial-gradient(ellipse 8% 6% at 76% 68%,
      rgba(255,247,214,0.38) 0%, rgba(255,247,214,0) 58%);
  animation: k-glint-b 13s ease-in-out -5s infinite;
}
.k-glint.g3 {
  background:
    radial-gradient(ellipse 10% 8% at 66% 22%,
      rgba(255,248,218,0.40) 0%, rgba(255,248,218,0) 62%),
    radial-gradient(ellipse 12% 9% at 20% 80%,
      rgba(255,250,224,0.36) 0%, rgba(255,250,224,0) 60%);
  animation: k-glint-a 17s ease-in-out -11s infinite;
}
/* 影の揺らぎ：明滅の山谷を不揃いな間隔に置いて、機械的な往復に見せない */
@keyframes k-waver-a {
  0%   { transform: translate(0, 0)        scale(1);    opacity: 0.55; }
  27%  { transform: translate(1.3%, 0.7%)  scale(1.03); opacity: 0.95; }
  44%  { transform: translate(0.4%, 1.2%)  scale(0.99); opacity: 0.62; }
  63%  { transform: translate(1.8%, 0.2%)  scale(1.04); opacity: 0.88; }
  81%  { transform: translate(0.7%, 1.0%)  scale(1.01); opacity: 0.58; }
  100% { transform: translate(0, 0)        scale(1);    opacity: 0.55; }
}
@keyframes k-waver-b {
  0%   { transform: translate(0, 0)         scale(1);    opacity: 0.9; }
  22%  { transform: translate(-1.2%, 0.8%)  scale(1.02); opacity: 0.5; }
  47%  { transform: translate(-0.3%, 1.4%)  scale(1.05); opacity: 0.85; }
  69%  { transform: translate(-1.6%, 0.4%)  scale(0.99); opacity: 0.55; }
  100% { transform: translate(0, 0)         scale(1);    opacity: 0.9; }
}
/* 光のまたたき：一瞬強まり、また沈む。粒ごとに周期が違う */
@keyframes k-glint-a {
  0%   { opacity: 0.20; transform: translate(0, 0); }
  19%  { opacity: 0.85; transform: translate(0.6%, 0.3%); }
  36%  { opacity: 0.32; transform: translate(0.2%, 0.7%); }
  58%  { opacity: 0.72; transform: translate(0.9%, 0.1%); }
  77%  { opacity: 0.26; transform: translate(0.3%, 0.5%); }
  100% { opacity: 0.20; transform: translate(0, 0); }
}
@keyframes k-glint-b {
  0%   { opacity: 0.65; transform: translate(0, 0); }
  24%  { opacity: 0.22; transform: translate(-0.5%, 0.4%); }
  45%  { opacity: 0.80; transform: translate(-0.8%, 0.1%); }
  71%  { opacity: 0.30; transform: translate(-0.2%, 0.6%); }
  100% { opacity: 0.65; transform: translate(0, 0); }
}

@keyframes band-slide {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
@keyframes band-breathe-soft {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.72; }
}

.room-foot {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 2rem;
}

.room-choice {
  display: flex; justify-content: center; gap: 1.2rem;
  padding: 1rem 0 0.6rem; flex-wrap: wrap;
}
.room-choice[hidden] { display: none; }
.room-choice-again {
  background: transparent; color: var(--accent);
  border: 1px solid var(--accent-soft);
}
.room-choice-again:hover { background: var(--accent); color: var(--white); opacity: 1; }

/* 部屋を移る矢印 */
.room-arrow {
  position: fixed; top: 50%; transform: translateY(-50%);
  z-index: 50;
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; line-height: 1;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent; border-radius: 50%;
  cursor: pointer;
  opacity: 0.45;
  transition: opacity 0.3s, color 0.3s, background 0.3s, border-color 0.3s;
}
.room-arrow:hover, .room-arrow:focus-visible {
  opacity: 1;
  color: var(--accent);
  background: rgba(255,252,248,0.85);
  border-color: var(--accent-soft);
}
.room-arrow[hidden] { display: none; }
.room-arrow-left { left: 1.2rem; }
.room-arrow-right { right: 1.2rem; }

.exhibit-source {
  font-size: 0.78rem; color: var(--text-muted);
  text-align: center; margin-top: 2rem;
}

/* ── 絞り込みボタン ── */
.tag-filter { display: flex; gap: 0.8rem; margin-bottom: 2.5rem; flex-wrap: wrap; }
.tag-filter-btn {
  font-family: inherit; font-size: 0.8rem; letter-spacing: 0.06em;
  color: var(--text-light); background: transparent;
  border: 1px solid var(--border); border-radius: 999px;
  padding: 0.45rem 1.2rem; cursor: pointer; transition: all 0.25s;
}
.tag-filter-btn:hover { border-color: var(--accent-soft); }
.tag-filter-btn.is-active {
  background: var(--accent); border-color: var(--accent); color: var(--white);
}
.event-thumb .book-cover-title { font-size: 0.78rem; }

/* ── お問い合わせフォーム ── */
.contact-form {
  max-width: 480px; margin: 3rem auto 0; text-align: left;
}
.hidden-field { position: absolute; left: -9999px; }
.form-row { display: block; margin-bottom: 1.4rem; }
.form-row span {
  display: block; font-size: 0.78rem; color: var(--text-muted);
  letter-spacing: 0.06em; margin-bottom: 0.4rem;
}
.form-row input, .form-row textarea {
  width: 100%; font-family: inherit; font-size: 0.88rem;
  color: var(--text-main); background: var(--white);
  border: 1px solid var(--border); border-radius: 2px;
  padding: 0.6rem 0.8rem; resize: vertical;
}
.form-row input:focus, .form-row textarea:focus {
  outline: none; border-color: var(--accent-soft);
}
.contact-form .ticket-button {
  border: none; font-family: inherit; cursor: pointer;
}

/* ── アニメーション制御 ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ── モバイル ── */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .site-name-en { display: none; }
  .nav-links {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: rgba(255,252,248,0.97); backdrop-filter: blur(12px);
    flex-direction: column; padding: 1.5rem 2rem 2rem; gap: 1.2rem;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  main.page { padding: 120px 1.5rem 3.5rem; }
  .books-grid { grid-template-columns: repeat(2, 1fr); gap: 2rem 1.4rem; }
  .book-detail-head { grid-template-columns: 1fr; gap: 2rem; }
  .book-detail-covers { max-width: 260px; margin: 0 auto; }
  .class-cards { grid-template-columns: 1fr; }
  .profile-body { flex-direction: column; align-items: center; text-align: center; }
  .profile-text { text-align: left; }
  .room-hero { padding: 1.5rem; }
  .room-gate { padding: 1.5rem; }
  .room-stage { height: min(50svh, 430px); min-height: 360px; }
  .room-poem { --fs: min(0.88rem, 2.4svh); }
  .room-arrow { width: 40px; height: 40px; font-size: 1.4rem; }
  .room-arrow-left { left: 0.5rem; }
  .room-arrow-right { right: 0.5rem; }
}