/* ページ（紙面）と文字演出。リーダーとエディタの両方で読み込む。
   紙面は 9:16（旧WebPと同じ 1125×2000 比）で、文字サイズは紙面の高さ基準(cqh)なので
   どの端末でも同じ位置で改行される。＝エディタで見たままが公開ページになる。 */

:root {
  /* 電子書籍のような真っ白な紙 */
  --paper: #ffffff;
  --paper-1: #ffffff;
  --paper-2: #ffffff;
  --paper-3: #ffffff;
  --ink: #1c1c1c;
  --ink-soft: #8a8a8a;
  --endpaper: #cfe3cf;
  --book-font: "Shippori Mincho", "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", "MS PMincho", serif;
}

.page {
  position: relative;
  width: 100%;
  height: 100%;
  color: var(--ink);
  font-family: var(--book-font);
}

.paper {
  position: absolute;
  inset: 0;
  overflow: hidden;
  container-type: size;
  background: var(--paper);
}

/* 綴じ側の影。reader が .side-left / .side-right を付ける */
.paper::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
}
.side-left .paper::after  { background: linear-gradient(to left,  rgba(0,0,0,.10) 0, rgba(0,0,0,.03) 2.5%, transparent 6%); }
.side-right .paper::after { background: linear-gradient(to right, rgba(0,0,0,.10) 0, rgba(0,0,0,.03) 2.5%, transparent 6%); }

/* ---- 本文 ---- */
.page__body {
  position: absolute;
  top: 10.5cqh; bottom: 9cqh; left: 9cqw; right: 9cqw;
  overflow: hidden;
  font-size: calc(2.3cqh * var(--fs, 1));
  line-height: var(--lh, 1.75);
  text-align: justify;
  line-break: strict;
  overflow-wrap: anywhere;
  hanging-punctuation: allow-end;
  font-feature-settings: "pkna" 0;
}
.mode-v .page__body { writing-mode: vertical-rl; text-orientation: mixed; }
.mode-h .page__body { writing-mode: horizontal-tb; font-size: calc(3.9cqw * var(--fs, 1)); }

.page__body > * { margin: 0; }
/* エディタ(ProseMirror)と同じ空白の扱いにして、改行位置を一致させる */
.page__body p, .page__body h2, .page__body h3, .page__body li { white-space: break-spaces; }
.page__body p:empty::before, .page__body p > br:only-child { content: "\200b"; }
.page__body h2 { font-size: 1.45em; font-weight: 600; line-height: 1.4; margin-block-end: 1em; letter-spacing: .08em; }
.page__body h3 { font-size: 1.15em; font-weight: 600; margin-block-end: .5em; }
.page__body blockquote { margin: 0; margin-block: .5em; padding-inline-start: .8em; border-inline-start: .1em solid rgba(90, 70, 50, .35); font-size: .78em; line-height: 1.55; color: #444; }
.page__body blockquote p { margin: 0; }
.page__body hr { border: 0; margin: 0; block-size: 2.4em; inline-size: 100%; position: relative; }
.page__body hr::after { content: "＊　＊　＊"; position: absolute; inset: 0; display: grid; place-items: center; font-size: .8em; color: var(--ink-soft); }
.page__body ul, .page__body ol { padding-inline-start: 1.5em; }
.page__body strong { font-weight: 700; }
.page__body s { text-decoration-thickness: .06em; }
/* 文中画像（手書き文字など）。--h は文字何個ぶんの大きさか */
.page__body img { height: var(--h, 1em); width: auto; max-width: 100%; vertical-align: middle; }
.page__body ruby rt { font-size: .45em; }

/* 柱とノンブル */
.page__running, .page__folio {
  position: absolute;
  font-size: 1.35cqh;
  color: var(--ink-soft);
  letter-spacing: .25em;
  z-index: 2;
  white-space: nowrap;
}
.page__running { top: 4.5cqh; }
.page__folio { bottom: 4cqh; }
.page__running, .page__folio { left: 50%; transform: translateX(-50%); }
.side-left .page__running, .side-left .page__folio { left: 8cqw; right: auto; transform: none; }
.side-right .page__running, .side-right .page__folio { right: 8cqw; left: auto; transform: none; }

/* 自由配置の画像（挿絵）。.layers 自体は箱を作らず、紙面を基準に置く */
.layers { display: contents; }
.layer { position: absolute; height: auto; max-width: none; pointer-events: none; user-select: none; -webkit-user-drag: none; }
.page__body { z-index: 2; }

/* 画像ページ（表紙・挿絵） */
.page__image { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.page__image.fit-cover { object-fit: cover; }
.page__image.fit-contain { object-fit: contain; padding: 7cqh 7cqw; box-sizing: border-box; }
.page--cover .paper::after, .page--back .paper::after { background: linear-gradient(to right, rgba(0,0,0,.06), transparent 4%, transparent 96%, rgba(0,0,0,.06)); }

/* 見返し（表紙の裏） */
.page--endpaper .paper {
  background-color: var(--endpaper);
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .2 0 0 0 0 .35 0 0 0 0 .25 0 0 0 .10 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E"),
    radial-gradient(circle at 50% 45%, #dcebd8, #c3d9c2);
}
.page--blank .paper { background: var(--paper); }

/* ================= 文字演出 (effects.js と対応) ================= */
.fx-fade    { opacity: var(--o, .35); }
.fx-blur    { filter: blur(var(--b, .06em)); }
.fx-glow    { text-shadow: 0 0 var(--g, .4em) currentColor, 0 0 calc(var(--g, .4em) * .4) currentColor; color: color-mix(in srgb, currentColor 70%, transparent); }
.fx-fadeout { display: inline-block; -webkit-mask-image: linear-gradient(to right, #000 15%, transparent); mask-image: linear-gradient(to right, #000 15%, transparent); }
.mode-v .fx-fadeout { -webkit-mask-image: linear-gradient(to bottom, #000 15%, transparent); mask-image: linear-gradient(to bottom, #000 15%, transparent); }
.fx-color   { color: var(--c, #8a3b2e); }

.fx-rotate  { display: inline-block; transform: rotate(var(--r, 15deg)); }
.fx-skew    { display: inline-block; transform: skewX(var(--k, -12deg)); }
.mode-v .fx-skew { transform: skewY(var(--k, -12deg)); }
.fx-mirror  { display: inline-block; transform: scaleX(-1); }
.mode-v .fx-mirror { transform: scaleY(-1); }
.fx-size    { font-size: calc(var(--s, 1.6) * 1em); }
.fx-shift   { position: relative; inset-block-start: var(--y, .4em); }
.fx-space   { letter-spacing: var(--ls, .5em); }

.fx-dots    { -webkit-text-emphasis: filled sesame; text-emphasis: filled sesame; }
.fx-line    { text-decoration-line: underline; text-underline-position: under right; text-underline-offset: .25em; text-decoration-thickness: .05em; }
.fx-tcy     { text-combine-upright: all; -webkit-text-combine: horizontal; }
.fx-upright { text-orientation: upright; }
.fx-sideways{ text-orientation: sideways; }

.fx-appear  { opacity: 0; }
.is-shown .fx-appear { animation: fx-appear 2.6s ease var(--d, 1.2s) forwards; }
.is-shown .fx-vanish { animation: fx-vanish 4s ease var(--d, 2s) forwards; }
.fx-sway    { display: inline-block; animation: fx-sway 4.5s ease-in-out infinite; }
.fx-tremble { display: inline-block; animation: fx-tremble .28s steps(2) infinite; }

@keyframes fx-appear  { from { opacity: 0; filter: blur(.12em); } to { opacity: 1; filter: blur(0); } }
@keyframes fx-vanish  { from { opacity: 1; } to { opacity: .06; filter: blur(.05em); } }
@keyframes fx-sway    { 0%, 100% { transform: rotate(-3deg); } 50% { transform: rotate(3deg) translateY(.05em); } }
@keyframes fx-tremble { 0% { transform: translate(.02em, -.02em); } 100% { transform: translate(-.02em, .02em); } }

@media (prefers-reduced-motion: reduce) {
  .fx-appear { opacity: 1; }
  .is-shown .fx-appear, .is-shown .fx-vanish, .fx-sway, .fx-tremble { animation: none; }
}

/* 読者向け: 夜の机に置かれた一冊の本 */
html, body { margin: 0; height: 100%; }
body.reader {
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 55% at 50% 38%, rgba(255, 214, 150, .16), transparent 70%),
    radial-gradient(ellipse at 50% 40%, #463a31 0%, #2a221d 58%, #141009 100%);
  background-color: #1d1814;
  color: #eadfca;
  font-family: var(--book-font);
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
}

/* 端末差でわずかに溢れた最終行が消えないよう、余白へはみ出すのは許す */
.reader .page__body { overflow: visible; }

.pages-src {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}

#stage {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  touch-action: pinch-zoom;
  opacity: 0; transition: opacity .8s ease .1s;
}
.ready #stage { opacity: 1; }

/* ---- 本体 ---- */
.book {
  position: relative;
  width: calc(var(--pw) * 2);
  height: var(--ph);
  perspective: calc(var(--pw) * 5);
  transition: transform .9s cubic-bezier(.4, .1, .2, 1);
}
.book.single { width: var(--pw); perspective: calc(var(--pw) * 3.2); }
.book[data-shift="right"] { transform: translateX(calc(var(--pw) / 2)); }
.book[data-shift="left"]  { transform: translateX(calc(var(--pw) / -2)); }

.slot { position: absolute; top: 0; width: var(--pw); height: var(--ph); transition: opacity .18s; }
.slot-left { left: 0; }
.slot-right { left: var(--pw); }
.book.single .slot { left: 0; }
.slot.empty { pointer-events: none; }
.slot:not(.empty) { box-shadow: 0 1.2vh 3.5vh rgba(0, 0, 0, .5), 0 .2vh .5vh rgba(0, 0, 0, .35); }
.book.single .slot:not(.empty) { box-shadow: 0 1vh 3vh rgba(0, 0, 0, .55); }
.book.fading .slot { opacity: 0; }

/* 頁の厚み（小口）。右綴じなら未読分は左に積もる */
.edges {
  position: absolute; top: .5%; height: 99%;
  --stack: calc(var(--pw) * .028);
  background: repeating-linear-gradient(to right, #ffffff 0 1px, #d6d6d6 1px 2px);
  box-shadow: 0 1vh 3vh rgba(0, 0, 0, .45);
  transition: width .9s, opacity .5s;
}
.edges-left  { right: 100%; width: calc(var(--stack) * (1 - var(--read, 0)) + 1px); border-radius: 2px 0 0 2px; }
.edges-right { left: 100%;  width: calc(var(--stack) * var(--read, 0) + 1px); border-radius: 0 2px 2px 0; }
[data-binding="ltr"] .edges-left  { width: calc(var(--stack) * var(--read, 0) + 1px); }
[data-binding="ltr"] .edges-right { width: calc(var(--stack) * (1 - var(--read, 0)) + 1px); }
.book.single .edges, .book[data-shift="left"] .edges, .book[data-shift="right"] .edges { opacity: 0; }

/* ---- めくれる紙 ---- */
.leaf {
  position: absolute; top: 0; width: var(--pw); height: var(--ph);
  transform-style: preserve-3d;
  z-index: 10;
  animation-duration: var(--dur, .9s);
  animation-timing-function: cubic-bezier(.45, .05, .25, 1);
  animation-fill-mode: both;
  will-change: transform;
}
.leaf.in-left  { left: 0; transform-origin: 100% 50%; }
.leaf.in-right { left: var(--pw); transform-origin: 0 50%; }
.book.single .leaf { left: 0; }
.leaf.in-left.go          { animation-name: turn-to-right; }
.leaf.in-right.go         { animation-name: turn-to-left; }
.leaf.in-left.reverse.go  { animation-name: turn-back-from-right; }
.leaf.in-right.reverse.go { animation-name: turn-back-from-left; }
.leaf.in-left.reverse  { transform: rotateY(180deg); }
.leaf.in-right.reverse { transform: rotateY(-180deg); }

@keyframes turn-to-right        { from { transform: rotateY(0); }       to { transform: rotateY(180deg); } }
@keyframes turn-to-left         { from { transform: rotateY(0); }       to { transform: rotateY(-180deg); } }
@keyframes turn-back-from-right { from { transform: rotateY(180deg); }  to { transform: rotateY(0); } }
@keyframes turn-back-from-left  { from { transform: rotateY(-180deg); } to { transform: rotateY(0); } }

.leaf-face {
  position: absolute; inset: 0;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  box-shadow: 0 0 2vh rgba(0, 0, 0, .25);
}
.leaf-face.back { transform: rotateY(180deg); }
.leaf-face::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; z-index: 5;
  background: linear-gradient(to left, rgba(40, 25, 10, .45), rgba(40, 25, 10, 0) 70%);
  opacity: 0;
}
.leaf.go .leaf-face::after { animation: leaf-shade var(--dur, .9s) ease-in-out both;
}
.leaf.in-right .leaf-face::after { background: linear-gradient(to right, rgba(40, 25, 10, .45), rgba(40, 25, 10, 0) 70%); }
.leaf-face.back::after { transform: scaleX(-1); }
@keyframes leaf-shade { 0% { opacity: 0; } 45% { opacity: .9; } 55% { opacity: .9; } 100% { opacity: 0; } }

/* 端で進めないときの小さな揺れ */
.book.nudge-a { animation: nudge-a .35s; }
.book.nudge-b { animation: nudge-b .35s; }
@keyframes nudge-a { 30% { translate: 6px 0; } }
@keyframes nudge-b { 30% { translate: -6px 0; } }

/* ---- 操作UI（中央タップで出る） ---- */
#ui .bar {
  position: fixed; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; gap: 1rem;
  padding: .7rem max(1rem, env(safe-area-inset-right)) .7rem max(1rem, env(safe-area-inset-left));
  color: #f3e8d2;
  transition: transform .35s ease, opacity .35s ease;
  opacity: 0; pointer-events: none;
}
.bar-top { top: 0; justify-content: space-between; background: linear-gradient(rgba(20, 15, 10, .85), rgba(20, 15, 10, 0)); transform: translateY(-100%); padding-top: max(.7rem, env(safe-area-inset-top)) !important; }
.bar-bottom { bottom: 0; background: linear-gradient(rgba(20, 15, 10, 0), rgba(20, 15, 10, .85)); transform: translateY(100%); padding-bottom: max(.9rem, env(safe-area-inset-bottom)) !important; }
#ui.show .bar { transform: none; opacity: 1; pointer-events: auto; }
.bar-title { letter-spacing: .2em; font-size: .95rem; }
.bar-actions { display: flex; gap: .4rem; }
#ui button, #toc button, #toast button {
  font: inherit; font-size: .85rem; letter-spacing: .15em;
  color: inherit; background: rgba(255, 240, 210, .08);
  border: 1px solid rgba(243, 232, 210, .35); border-radius: 999px;
  padding: .35rem .95rem; cursor: pointer;
}
#ui button:hover { background: rgba(255, 240, 210, .18); }
#slider { flex: 1; accent-color: #c9a86a; }
#folio-label { min-width: 7em; text-align: center; font-size: .85rem; letter-spacing: .1em; }

/* ---- 目次 ---- */
#toc { border: 0; padding: 0; background: transparent; max-width: min(92vw, 30rem); width: 100%; color: var(--ink); }
#toc::backdrop { background: rgba(10, 8, 5, .6); backdrop-filter: blur(2px); }
.toc-paper {
  position: relative;
  padding: 2.2rem 2rem 1.6rem;
  background: radial-gradient(120% 90% at 50% 40%, var(--paper-1), var(--paper-2) 70%, var(--paper-3));
  box-shadow: 0 2vh 5vh rgba(0, 0, 0, .5);
  max-height: 80vh; overflow: auto;
}
.toc-paper h2 { margin: 0 0 1.4rem; text-align: center; font-weight: 600; letter-spacing: .5em; font-size: 1.15rem; }
#toc-list { list-style: none; margin: 0; padding: 0; }
#toc-list li button {
  display: flex; width: 100%; align-items: baseline; gap: .4rem;
  border: 0; border-radius: 0; background: none; padding: .6rem .2rem; letter-spacing: .08em;
  font-size: 1rem; color: var(--ink); text-align: left;
}
#toc-list li button:hover { background: rgba(120, 90, 50, .08); }
#toc button:focus:not(:focus-visible) { outline: none; }
#toc-list .dots { flex: 1; border-bottom: 1px dotted rgba(80, 60, 40, .45); transform: translateY(-.3em); }
#toc-list .f { font-size: .85rem; color: var(--ink-soft); }
#toc-list li.passed .t { color: #777; }
#btn-toc-close { display: block; margin: 1.4rem auto 0; color: var(--ink) !important; border-color: rgba(60, 40, 20, .3) !important; }

/* ---- お知らせ ---- */
#toast {
  position: fixed; left: 50%; bottom: max(1.5rem, env(safe-area-inset-bottom)); z-index: 60;
  transform: translate(-50%, 150%); opacity: 0;
  display: flex; align-items: center; gap: .8rem;
  padding: .7rem 1.1rem; border-radius: 999px;
  background: rgba(30, 24, 18, .92); color: #f0e4cc;
  font-size: .88rem; letter-spacing: .08em; white-space: nowrap;
  box-shadow: 0 1vh 3vh rgba(0, 0, 0, .4);
  transition: transform .5s, opacity .5s;
}
#toast.show { transform: translate(-50%, 0); opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  .book, .edges, #stage { transition: none; }
}