/* 結家の物語(絵本)。トップ(/#story)と理念のページ(/philosophy/#story)で共通(2026-10-14 index.html から切り出し)
   ページの中身は tools/ehon/build_book_pages.py が両方のページに書く。動きは /assets/book.js */
.book { outline: none; }
.book:focus-visible { outline: 3px solid var(--blue-text); outline-offset: 6px; border-radius: 16px; }
.book-stage { position: relative; display: grid; gap: 1rem; perspective: 1800px; }
.book.is-turning .book-stage { z-index: 61; } /* めくる紙が下の帯・上のヘッダー(z60)に隠れないように(めくっている間だけ) */
.book-page {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.9rem 1.3rem;
  border-radius: 14px;
  background: #FBF6EC;
  box-shadow: 0 2px 12px var(--shadow);
  color: #3d2a1c;
  text-align: center;
}
.book-page::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid #e6d9c1;
  border-radius: 8px;
  pointer-events: none;
}
.book-page p {
  margin: 0 0 1.3em;
  font-size: 1.1rem;
  line-height: 2.1;
}
.book-page p:last-child { margin-bottom: 0; }
.book-page .bk-title { font-size: 1.3rem; font-weight: 700; color: #a8453f; }
.book-page .bk-h { margin-bottom: 0.1em; font-weight: 700; color: #a8453f; }
.book-page .bk-h + p { margin-bottom: 0.9em; font-size: 0.95rem; line-height: 1.75; }
.book-page[data-spread="15"] .bk-h:not(:first-child) { margin-top: 1.6em; } /* 理念 WHAT・WHY・HOW の項目の間を広く(2026-10-14 本人) */
.book-page rt { font-size: 0.5em; }
.is-cover img {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center 75%;
  border-radius: 8px;
}
.is-cover .cover-title {
  margin: 1.1rem 0 0.2rem;
  font-size: 2rem;
  line-height: 1.6;
  font-weight: 700;
  color: #a8453f;
  letter-spacing: 0.06em;
}
.is-cover .cover-sub { font-size: 1.05rem; }
.is-cover .cover-title rt { font-size: 0.35em; } /* 本の中のルビ(0.5em)より30%小さく */
/* ---- 大きな画面で読む(絵本を押す)。閉じる＝×・Esc ---- */
.book.is-ready:not(.is-big) .book-stage { cursor: zoom-in; }
.book.is-big .book-stage { cursor: pointer; user-select: none; -webkit-user-select: none; }
.book-close { display: none; }
.book.is-big { position: fixed; inset: 0; z-index: 300; display: flex; flex-direction: column; justify-content: center; padding: 3.6rem 1rem 0.6rem; overflow-y: auto; background: var(--bg); }
/* 大きな画面＝普通の時の本(幅・文字)をそのまま拡大(JSの fitBig が倍率を決める)＝縦横比が変わらない */
.book.is-big .book-stage { flex: none; margin: 0 auto; transform-origin: top center; perspective: var(--big-persp, 3600px); } /* 画面いっぱいの時は紙の起き上がりを浅く＝画面の端で切れない */
.book.is-big .book-nav, .book.is-big .book-nav.is-away { position: sticky; bottom: 0; width: 100%; max-width: var(--big-w, 100%); margin: 0.6rem auto 0; padding: 0.6rem 0; opacity: 1; visibility: visible; pointer-events: auto; background: var(--bg); }
.book.is-big .book-close { display: grid; place-items: center; position: fixed; top: 0.7rem; right: 0.8rem; z-index: 2; width: 2.6rem; height: 2.6rem; border: 2px solid var(--line); border-radius: 50%; background: var(--white); box-shadow: 0 2px 8px var(--shadow); color: var(--heading); font: inherit; font-size: 1.4rem; font-weight: 700; line-height: 1; cursor: pointer; }
html.is-book-big { overflow: hidden; }
.book.is-ready .book-page { display: none; }
.book.is-ready .book-page.is-active { display: flex; }
/* 全ページ同じ高さ：JSが一番高いページを測って --book-h に入れる */
.book.is-ready .book-page { height: var(--book-h, auto); }
.book.is-measuring .book-page { display: flex !important; height: auto !important; visibility: hidden; }
/* 左開きの本(左から右へ読む・本人 2026-10-06)：綴じ目(紙の左端)を軸に、紙をめくるように動かす
   つぎ＝いま見ているページが手前へ起きて左へ倒れ、下から次のページが現れる
   まえ＝左から戻ってきたページが同じ軸で倒れて収まる
   JSがめくる紙だけに turn-out / turn-in を付ける(付かなければ動かないだけ) */
.book.is-ready .book-page.is-leaving { display: flex; }
.book-page.turn-out,
.book-page.turn-in {
  transform-origin: left center;
  backface-visibility: hidden;
  will-change: transform, opacity;
}
.book-page.turn-out { animation: turn-out 1.3s cubic-bezier(0.37, 0.02, 0.26, 1) both; }
.book-page.turn-in { position: relative; z-index: 3; animation: turn-in 1.3s cubic-bezier(0.37, 0.02, 0.26, 1) both; }
.book-page.is-single.turn-out,
.book-page.is-single.turn-in {
  animation-duration: 1.9s;
  animation-timing-function: cubic-bezier(0.45, 0.05, 0.35, 1);
}
/* 紙が覆いかぶさる側のページは、覆われてから次のページへ静かに入れ替わる */
.book-page.turn-fade { animation: turn-fade 0.24s ease both; }
/* 表紙をめくっている間は、中のページをまだ見せない */
.book-page.is-veiled { opacity: 0; }
.book-page.turn-reveal { animation: turn-reveal 0.45s ease both; }
@keyframes turn-out {
  from { transform: rotateY(0deg); opacity: 1; }
  72% { opacity: 1; }
  92% { transform: rotateY(-84deg); opacity: 0.35; }
  to { transform: rotateY(-92deg); opacity: 0; }
}
@keyframes turn-in {
  from { transform: rotateY(-92deg); opacity: 0; }
  8% { opacity: 0.35; }
  28% { opacity: 1; }
  to { transform: rotateY(0deg); opacity: 1; }
}
@keyframes turn-fade { from { opacity: 1; } to { opacity: 0; } }
@keyframes turn-reveal { from { opacity: 0; } to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  .book-page.turn-out, .book-page.turn-in, .book-page.turn-fade, .book-page.turn-reveal { animation: none; }
  .book-page.is-veiled { opacity: 1; }
  .book-nav { transition: none; }
}
.book-nav {
  position: sticky;
  bottom: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 1rem;
  padding: 0.6rem 0;
  background: rgba(241, 248, 251, 0.94);
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.book-nav.is-away { opacity: 0; visibility: hidden; pointer-events: none; }
.book-btn {
  min-width: 5.8em;
  padding: 0.41rem 1.2rem;
  border: 2px solid var(--blue-text);
  border-radius: 999px;
  background: var(--white);
  color: var(--blue-text);
  font: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
}
.book-btn:disabled { opacity: 0.35; cursor: default; }
.book-btn:focus-visible { outline: 3px solid var(--pink-text); outline-offset: 2px; }
.book-count { margin: 0; font-weight: 700; color: var(--text-sub); white-space: nowrap; }
@media (min-width: 640px) {
  .book-page { padding: 2.4rem 1.6rem; }
}
@media (min-width: 900px) {
  .book.is-ready .book-stage { grid-template-columns: 1fr 1fr; gap: 0; }
  .book.is-ready .book-page { border-radius: 0; }
  .book.is-ready .book-page.is-active:not(.is-single):nth-child(even) { border-radius: 14px 0 0 14px; box-shadow: inset -12px 0 16px -14px rgba(61, 42, 28, 0.35), 0 2px 12px var(--shadow); }
  .book.is-ready .book-page.is-active:not(.is-single):nth-child(odd) { border-radius: 0 14px 14px 0; box-shadow: inset 12px 0 16px -14px rgba(61, 42, 28, 0.35), 0 2px 12px var(--shadow); }
  .book.is-ready .book-page.is-single { grid-column: 1 / -1; justify-self: center; width: 50%; border-radius: 14px; }
  .book-page.is-single.turn-out { animation-name: turn-out-single; }
  .book-page.is-single.turn-in { animation-name: turn-in-single; }
  @keyframes turn-out-single {
    from { transform: translateX(0) rotateY(0deg); opacity: 1; }
    30% { transform: translateX(50%) rotateY(0deg); opacity: 1; }
    80% { opacity: 1; }
    95% { transform: translateX(50%) rotateY(-84deg); opacity: 0.35; }
    to { transform: translateX(50%) rotateY(-92deg); opacity: 0; }
  }
  @keyframes turn-in-single {
    from { transform: translateX(50%) rotateY(-92deg); opacity: 0; }
    8% { opacity: 0.35; }
    25% { opacity: 1; }
    70% { transform: translateX(50%) rotateY(0deg); opacity: 1; }
    to { transform: translateX(0) rotateY(0deg); opacity: 1; }
  }
}