/* Kindle-style reusable book reader — shared across all books on the site */

:root {
  --paper: #f6f1e7;
  --paper-raised: #efe8d9;
  --ink: #201d19;
  --ink-soft: #5c564c;
  --ink-faint: #6c6554;
  --accent: #a8651f;
  --accent-ink: #7a4a17;
  --rule: #ddd2bd;
  --card: #fffdf8;
  --shadow: rgba(32, 29, 25, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #17140f;
    --paper-raised: #1e1a14;
    --ink: #ece5d6;
    --ink-soft: #b5ac9a;
    --ink-faint: #948a76;
    --accent: #dd9a4e;
    --accent-ink: #eeb877;
    --rule: #38321f;
    --card: #1e1a14;
    --shadow: rgba(0, 0, 0, 0.35);
  }
}

:root[data-theme="dark"] {
  --paper: #17140f;
  --paper-raised: #1e1a14;
  --ink: #ece5d6;
  --ink-soft: #b5ac9a;
  --ink-faint: #948a76;
  --accent: #dd9a4e;
  --accent-ink: #eeb877;
  --rule: #38321f;
  --card: #1e1a14;
  --shadow: rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  /* The hidden pagination measurer must never create extra scrollable
     area (it used to sit off-screen at left:-99999px, which ballooned
     the document's scroll width to ~100,000px and made RTL pages open
     scrolled to a nonsense position). overflow-x:hidden is the safety
     net regardless of how the measurer is positioned. */
  overflow-x: hidden;
}

body.reader-body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Assistant', ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* The element the engine mounts into (e.g. #reader-root) must itself
   become the flex container that lays out topbar/toolbar/main/bottombar
   and grow to fill the page, whatever element/id the host page used. */
.reader-app-root {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

.reader-topbar {
  padding: 14px 20px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--ink-faint);
}
.reader-topbar a {
  color: var(--ink-faint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.reader-topbar a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.reader-topbar .reader-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.reader-cover-thumb {
  width: 32px;
  height: 46px;
  object-fit: cover;
  border-radius: 2px;
  box-shadow: 0 1px 4px var(--shadow);
  flex-shrink: 0;
}
.reader-topbar .reader-title-block {
  font-family: 'Frank Ruhl Libre', 'Newsreader', Georgia, serif;
  font-style: italic;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.3;
}
.reader-topbar .reader-subtitle,
.reader-topbar .reader-author {
  font-family: 'Assistant', ui-sans-serif, system-ui, sans-serif;
  font-style: normal;
  font-size: 0.72rem;
  color: var(--ink-faint);
}

.reader-toolbar {
  padding: 10px 20px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  background: var(--paper-raised);
}
.reader-toolbar select,
.reader-toolbar button {
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 6px 10px;
  cursor: pointer;
}
.reader-toolbar select:hover,
.reader-toolbar button:hover { border-color: var(--accent); }
.reader-font-group {
  display: flex;
  gap: 4px;
}
.reader-font-group button {
  width: 32px;
  padding: 6px 0;
  text-align: center;
}
.reader-font-group button[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}
.reader-theme-group button[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent-ink);
}

.reader-main {
  flex: 1 1 auto;
  display: flex;
  align-items: stretch;
  justify-content: center;
  min-height: 0;
  overflow: hidden;
  padding: 14px 4px;
  gap: 2px;
}

.reader-nav-btn {
  align-self: center;
  background: none;
  border: none;
  color: var(--ink-faint);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  padding: 14px 10px;
  border-radius: 6px;
}
.reader-nav-btn:hover:not(:disabled) { color: var(--accent); background: var(--paper-raised); }
.reader-nav-btn:disabled { opacity: 0.25; cursor: default; }
.reader-nav-btn svg { display: block; }

.reader-viewport {
  flex: 1;
  max-width: 1800px;
  min-width: 0;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 6px;
  box-shadow: 0 2px 10px var(--shadow);
  overflow: hidden;
  display: flex;
}

.reader-page-slot {
  flex: 1 1 0;
  min-width: 0;
  padding: 34px 32px;
  overflow: hidden;
  font-family: 'Frank Ruhl Libre', Georgia, serif;
  line-height: 1.85;
  color: var(--ink);
}
.reader-page-slot + .reader-page-slot {
  border-inline-start: 1px solid var(--rule);
}
.reader-page-slot.empty { visibility: hidden; }

.reader-page-slot h2 {
  font-family: 'Frank Ruhl Libre', Georgia, serif;
  font-style: italic;
  font-weight: 500;
  font-size: 1.3rem;
  margin: 0 0 16px;
  color: var(--accent-ink);
}
.reader-page-slot p { margin: 0 0 1em; }
.reader-page-slot blockquote {
  margin: 0 0 1em;
  padding-inline-start: 16px;
  border-inline-start: 3px solid var(--rule);
  color: var(--ink-soft);
  font-style: italic;
}
.reader-page-slot p.joke-sep {
  text-align: start;
  margin: 0.2em 0 1.1em;
  padding-inline-start: 0.3em;
  color: var(--ink-faint);
  letter-spacing: 0.25em;
  font-size: 0.85rem;
}
.reader-page-slot blockquote.poem {
  line-height: 1.55;
}
.reader-page-slot p.closing {
  text-align: center;
  font-style: italic;
  color: var(--ink-faint);
  margin-top: 0.4em;
}
.reader-page-slot p.footnote-rule {
  height: 0;
  margin: 1.6em 0 1.2em;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.reader-page-slot p.footnote {
  font-family: 'Assistant', ui-sans-serif, system-ui, sans-serif;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0 0 0.7em;
}
.reader-page-slot p.signoff {
  text-align: end;
  font-style: italic;
  color: var(--ink-soft);
  margin-top: 0.4em;
}

.reader-cover-page {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.reader-cover-page img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 4px 18px var(--shadow);
  border-radius: 2px;
}

.reader-bottombar {
  padding: 10px 20px 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  font-size: 0.82rem;
  color: var(--ink-faint);
}
.reader-progress-track {
  width: 160px;
  height: 4px;
  background: var(--rule);
  border-radius: 2px;
  overflow: hidden;
}
.reader-progress-fill {
  display: block;
  height: 100%;
  background: var(--accent);
  width: 0%;
}

/* Measurer used internally for pagination; never shown */
.reader-measurer {
  position: absolute;
  visibility: hidden;
  pointer-events: none;
  top: 0;
  left: 0;
  z-index: -1;
  overflow: hidden;
  font-family: 'Frank Ruhl Libre', Georgia, serif;
  line-height: 1.85;
}
.reader-measurer h2 {
  font-family: 'Frank Ruhl Libre', Georgia, serif;
  font-style: italic;
  font-weight: 500;
  font-size: 1.3rem;
  margin: 0 0 16px;
}
.reader-measurer p { margin: 0 0 1em; }
.reader-measurer blockquote {
  margin: 0 0 1em;
  padding-inline-start: 16px;
  font-style: italic;
}
.reader-measurer p.joke-sep {
  margin: 0.2em 0 1.1em;
  padding-inline-start: 0.3em;
  letter-spacing: 0.25em;
  font-size: 0.85rem;
}
.reader-measurer blockquote.poem {
  line-height: 1.55;
}
.reader-measurer p.closing {
  font-style: italic;
  margin-top: 0.4em;
}
.reader-measurer p.footnote-rule {
  height: 0;
  margin: 1.6em 0 1.2em;
  padding: 0;
}
.reader-measurer p.footnote {
  font-family: 'Assistant', ui-sans-serif, system-ui, sans-serif;
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0 0 0.7em;
}
.reader-measurer p.signoff {
  font-style: italic;
  margin-top: 0.4em;
}

.reader-menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule);
  border-radius: 6px;
  color: var(--ink-faint);
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  margin-inline-start: auto;
  flex-shrink: 0;
  padding: 0;
  cursor: pointer;
}
.reader-menu-toggle svg { display: block; }
.reader-menu-toggle:hover { color: var(--accent); border-color: var(--accent); }

@media (max-width: 760px) {
  .reader-page-slot.spread-secondary { display: none; }
  .reader-main { padding: 10px 4px; gap: 2px; }
  .reader-page-slot { padding: 22px 18px; }
  .reader-nav-btn { padding: 10px 4px; font-size: 1.4rem; }
  .reader-toolbar { gap: 10px; padding: 8px 10px; }

  /* Kindle-style compact mobile header: only the book title (and a menu
     toggle) show by default. The breadcrumb, cover thumbnail, subtitle,
     author line and the whole toolbar (chapters/font/theme) collapse into
     a popover revealed by the menu toggle, instead of permanently eating
     into the limited vertical space a phone has for actual page content. */
  .reader-topbar { padding: 10px 14px; }
  .reader-topbar .reader-title-block { font-size: 0.92rem; }
  .reader-breadcrumb,
  .reader-cover-thumb,
  .reader-topbar .reader-subtitle,
  .reader-topbar .reader-author,
  .reader-toolbar {
    display: none;
  }
  .reader-menu-toggle { display: flex; }

  .reader-app-root.reader-menu-open .reader-breadcrumb { display: block; margin-bottom: 8px; }
  .reader-app-root.reader-menu-open .reader-cover-thumb { display: block; }
  .reader-app-root.reader-menu-open .reader-topbar .reader-subtitle,
  .reader-app-root.reader-menu-open .reader-topbar .reader-author { display: block; }
  .reader-app-root.reader-menu-open .reader-toolbar { display: flex; flex-wrap: wrap; }
}