/* 天智《教育科学化之路》整本书阅读器 · mobile first */
:root {
  --tz-paper: #fffdf7;
  --tz-bg: #f4eee3;
  --tz-ink: #211810;
  --tz-muted: #75695c;
  --tz-faint: rgba(71, 49, 28, .12);
  --tz-line: rgba(71, 49, 28, .18);
  --tz-panel: rgba(255, 250, 240, .92);
  --tz-accent: #9a6726;
  --tz-accent-soft: rgba(154, 103, 38, .12);
  --tz-shadow: 0 18px 50px rgba(50, 35, 20, .13);
  --reader-font-scale: 1;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
html, body { margin: 0; min-height: 100%; }
body.tz-book-reader {
  color: var(--tz-ink);
  background:
    radial-gradient(circle at 20% 0%, rgba(214,174,94,.12), transparent 30rem),
    linear-gradient(180deg, #fffaf1 0%, var(--tz-bg) 46%, #efe7d9 100%);
  font-family: ui-serif, "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  overflow: hidden;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}
button, select { font: inherit; }
a { color: inherit; text-decoration: none; }

.reader-chrome {
  position: fixed;
  left: 0; right: 0;
  z-index: 50;
  transition: transform .22s ease, opacity .22s ease;
  background: var(--tz-panel);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}
.reader-topbar {
  top: 0;
  padding: calc(.55rem + env(safe-area-inset-top)) .72rem .55rem;
  border-bottom: 1px solid var(--tz-line);
}
.reader-bottombar {
  bottom: 0;
  padding: .5rem .72rem calc(.55rem + env(safe-area-inset-bottom));
  border-top: 1px solid var(--tz-line);
}
body.chrome-hidden .reader-topbar { transform: translateY(-110%); opacity: 0; }
body.chrome-hidden .reader-bottombar { transform: translateY(110%); opacity: 0; }

.topbar-inner, .bottombar-inner {
  width: min(880px, 100%);
  margin: 0 auto;
  display: grid;
  align-items: center;
  gap: .55rem;
}
.topbar-inner { grid-template-columns: auto 1fr auto; }
.bottombar-inner { grid-template-columns: auto 1fr auto; }
.reader-title {
  min-width: 0;
  text-align: center;
  font-size: .9rem;
  font-weight: 800;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.reader-btn {
  min-width: 2.25rem;
  height: 2.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 .72rem;
  border: 1px solid var(--tz-line);
  border-radius: 999px;
  background: rgba(255,255,255,.58);
  color: var(--tz-ink);
  cursor: pointer;
}
.reader-btn:active { transform: translateY(1px); }
.reader-page-indicator {
  color: var(--tz-muted);
  font-size: .86rem;
  text-align: center;
  white-space: nowrap;
}

.reader-viewport {
  position: fixed;
  inset: 0;
  padding: calc(3.9rem + env(safe-area-inset-top)) .72rem calc(3.9rem + env(safe-area-inset-bottom));
  display: grid;
  place-items: center;
  perspective: 1500px;
  touch-action: manipulation;
}
body.chrome-hidden .reader-viewport {
  padding-top: calc(.76rem + env(safe-area-inset-top));
  padding-bottom: calc(.76rem + env(safe-area-inset-bottom));
}
.page-stage {
  width: min(860px, 100%);
  height: 100%;
  position: relative;
}
.ebook-page {
  width: 100%;
  height: 100%;
  overflow: hidden;
  border: 1px solid var(--tz-line);
  border-radius: 24px;
  background:
    linear-gradient(90deg, rgba(0,0,0,.026), transparent 6%, transparent 94%, rgba(0,0,0,.018)),
    var(--tz-paper);
  box-shadow: var(--tz-shadow);
  padding: clamp(1.12rem, 4.8vw, 2.35rem);
  transform-origin: left center;
}
.page-stage.turn-next .ebook-page { animation: turnNext .24s ease both; }
.page-stage.turn-prev .ebook-page { animation: turnPrev .24s ease both; }
@keyframes turnNext { from { opacity:.22; transform: translateX(18px) rotateY(-5deg); } to { opacity:1; transform: translateX(0) rotateY(0); } }
@keyframes turnPrev { from { opacity:.22; transform: translateX(-18px) rotateY(5deg); } to { opacity:1; transform: translateX(0) rotateY(0); } }

.reader-source { display: none !important; }
.reader-source-section { display: none; }

.ebook-page h1, .ebook-page h2, .ebook-page h3, .ebook-page p { max-width: 40em; }
.ebook-page h1 {
  margin: 0 0 .85em;
  font-size: calc(clamp(1.72rem, 7vw, 2.55rem) * var(--reader-font-scale));
  line-height: 1.26;
  letter-spacing: -.04em;
}
.ebook-page h1.part-title { font-size: calc(clamp(1.55rem, 6.4vw, 2.2rem) * var(--reader-font-scale)); }
.ebook-page h2 {
  margin: 1.15em 0 .62em;
  font-size: calc(clamp(1.1rem, 4.8vw, 1.46rem) * var(--reader-font-scale));
  line-height: 1.45;
}
.ebook-page h3 {
  margin: 1em 0 .58em;
  font-size: calc(1.1rem * var(--reader-font-scale));
}
.ebook-page p {
  margin: 0 0 1.02em;
  font-size: calc(clamp(1.02rem, 4.35vw, 1.16rem) * var(--reader-font-scale));
  line-height: 2.02;
  text-align: justify;
}
.ebook-page .section-author {
  margin: -.45rem 0 1.05rem;
  color: var(--tz-muted);
  text-align: left;
  font-size: calc(.98rem * var(--reader-font-scale));
}
.ebook-page .section-kicker,
.ebook-page .cover-kicker {
  margin-bottom: .75rem;
  color: var(--tz-accent);
  font-weight: 800;
  letter-spacing: .16em;
  font-size: calc(.88rem * var(--reader-font-scale));
  text-align: left;
}
.cover-page-content {
  min-height: 100%;
  display: grid;
  align-content: center;
}
.ebook-page .cover-page-content h1 {
  max-width: 8em;
  margin-bottom: .25em;
  font-size: calc(clamp(2.15rem, 10vw, 4.2rem) * var(--reader-font-scale));
}
.cover-subtitle { color: var(--tz-muted); font-size: calc(1.2rem * var(--reader-font-scale)) !important; text-align: left !important; }
.cover-author { margin-top: 2.2rem !important; font-weight: 800; }
.cover-note { color: var(--tz-muted); font-size: calc(.94rem * var(--reader-font-scale)) !important; }

.book-toc { display: grid; gap: .48rem; }
.toc-line {
  width: 100%;
  border: 1px solid var(--tz-line);
  border-radius: 16px;
  padding: .72rem .78rem;
  background: rgba(255,255,255,.48);
  text-align: left;
  color: var(--tz-ink);
}
.toc-line span { display:block; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.toc-line--part { background: var(--tz-accent-soft); font-weight: 800; }
.toc-line--chapter { padding-left: 1.18rem; }

.book-figure {
  margin: .65rem auto 1.1rem;
  max-width: min(100%, 680px);
  break-inside: avoid;
}
.book-figure picture {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
}
.book-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 16px;
  box-shadow: 0 10px 26px rgba(50, 35, 20, .09);
  pointer-events: none;
  background: #fffaf0;
  color-scheme: light;
  forced-color-adjust: none;
}
.book-figure figcaption {
  margin-top: .34rem;
  color: var(--tz-muted);
  text-align: center;
  font-size: .76rem;
}

.drawer {
  position: fixed;
  inset: 0 0 0 auto;
  z-index: 70;
  width: min(360px, 88vw);
  transform: translateX(104%);
  transition: transform .25s ease;
  background: rgba(255,250,240,.98);
  border-left: 1px solid var(--tz-line);
  box-shadow: -18px 0 48px rgba(50,35,20,.16);
  padding: calc(1rem + env(safe-area-inset-top)) 1rem calc(1rem + env(safe-area-inset-bottom));
  overflow: auto;
}
body.drawer-open .drawer { transform: translateX(0); }
.drawer h2 { margin: 0 0 .85rem; font-size: 1.15rem; }
.drawer-actions { display: flex; gap: .45rem; flex-wrap: wrap; margin-bottom: .8rem; }
.drawer .toc-line { margin-bottom: .42rem; }

.reader-hint {
  position: fixed;
  left: 50%; bottom: calc(4.6rem + env(safe-area-inset-bottom));
  z-index: 55;
  transform: translateX(-50%);
  padding: .42rem .68rem;
  border-radius: 999px;
  background: rgba(36,27,18,.68);
  color: #fffaf0;
  font-size: .78rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
}
.reader-hint.show { opacity: 1; }

@media (min-width: 760px) {
  .reader-viewport { padding-left: 1.25rem; padding-right: 1.25rem; }
  .ebook-page { border-radius: 28px; }
}

/* 修正：整本书目录页在分页时按条目换行显示 */
.ebook-page .toc-line {
  display: block;
  margin-bottom: .48rem;
}
.ebook-page .toc-line span {
  white-space: normal;
  line-height: 1.45;
}

/* 正式版：备案与文库信息 */
.cover-legal {
  margin-top: .35rem !important;
  color: var(--tz-muted);
  font-size: calc(.78rem * var(--reader-font-scale)) !important;
  text-align: left !important;
}
.cover-legal a,
.reader-legal a {
  text-decoration: underline;
  text-underline-offset: .18em;
}
.reader-legal {
  margin-top: 1rem;
  padding-top: .85rem;
  border-top: 1px solid var(--tz-line);
  color: var(--tz-muted);
  font-size: .82rem;
  line-height: 1.7;
}


/* 目录页：中间选章节，两侧留空给翻页点击 */
.ebook-page[data-section-type="toc"] {
  position: relative;
  padding-left: clamp(4.1rem, 18vw, 8rem);
  padding-right: clamp(4.1rem, 18vw, 8rem);
}

.ebook-page[data-section-type="toc"] h1 {
  text-align: center;
  max-width: none;
  margin-bottom: .55rem;
}

.ebook-page[data-section-type="toc"] h1::after {
  content: "点章节进入 · 点空白翻页";
  display: block;
  margin-top: .55rem;
  color: var(--tz-muted);
  font-size: calc(.76rem * var(--reader-font-scale));
  font-weight: 400;
  letter-spacing: .04em;
}

.ebook-page[data-section-type="toc"] .book-toc {
  width: min(100%, 34rem);
  margin-left: auto;
  margin-right: auto;
}

.ebook-page[data-section-type="toc"]::before,
.ebook-page[data-section-type="toc"]::after {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 3.2rem;
  padding: .55rem .18rem;
  border: 1px dashed rgba(117, 105, 92, .22);
  border-radius: 999px;
  color: rgba(117, 105, 92, .52);
  background: rgba(255, 250, 240, .36);
  font-size: .72rem;
  line-height: 1.45;
  text-align: center;
  white-space: pre-line;
  pointer-events: none;
}

.ebook-page[data-section-type="toc"]::before {
  content: "空白处\A上一页";
  left: .5rem;
}

.ebook-page[data-section-type="toc"]::after {
  content: "空白处\A下一页";
  right: .5rem;
}

@media (max-width: 420px) {
  .ebook-page[data-section-type="toc"] {
    padding-left: 3.75rem;
    padding-right: 3.75rem;
  }

  .ebook-page[data-section-type="toc"]::before,
  .ebook-page[data-section-type="toc"]::after {
    width: 2.8rem;
    font-size: .68rem;
  }

  .ebook-page[data-section-type="toc"]::before { left: .42rem; }
  .ebook-page[data-section-type="toc"]::after { right: .42rem; }
}