body.reader-picturebook-v2[data-reader-theme="stone"] {
  --stone-paper: #fffaf0;
  --stone-paper-deep: #f8ead0;
  --stone-ink: #3b2418;
  --stone-muted: #807362;
  --stone-cinnabar: #c74628;
  --stone-cinnabar-dark: #962c1c;
  --stone-jade: #4e744d;
  --stone-jade-dark: #31563a;
  --stone-apricot: #f4a42d;
  --stone-gold: #d19b45;
  --stone-line: #dfbd7b;
  --stone-dock-height: 254px;
  --stone-world-image-fit: cover;
  --stone-world-image-position: center center;
  --stone-classic-image-fit: contain;
  --stone-classic-image-position: center center;
  --stone-reference-image-fit: cover;
  --stone-reference-image-position: center center;
}

body.reader-picturebook-v2[data-reader-theme="stone"] {
  color: var(--stone-ink);
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

/* Chapter 05 ships with 16:9 scene art. Keep the whole composition visible
   inside the illustrated page while retaining the shared 3D-book treatment. */
body.chapter-05-havoc-heaven.reader-picturebook-v2[data-reader-theme="stone"] {
  --stone-world-image-fit: contain;
  --stone-world-image-position: center center;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .world-stage {
  background: #f7eed7;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .chapter-background {
  filter: saturate(0.94) brightness(1.06) contrast(0.98);
}

/* Header: the original prototype's plaque-like controls and seal lockup. */
body.reader-picturebook-v2[data-reader-theme="stone"] .topbar.stone-story-header {
  position: fixed;
  z-index: 40;
  top: 5px;
  left: 50%;
  right: auto;
  display: flex;
  width: min(1512px, calc(100vw - 24px));
  height: 78px;
  align-items: center;
  gap: 14px;
  padding: 0 30px 4px;
  transform: translateX(-50%);
  pointer-events: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .brand,
body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .topbar-switches,
body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .stone-chapter-tag {
  pointer-events: auto;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .brand {
  gap: 14px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .seal {
  display: grid;
  width: 55px;
  height: 62px;
  flex: 0 0 auto;
  place-items: center;
  border: 3px double #f0b657;
  border-radius: 19px 19px 21px 21px;
  color: #fff3cf;
  background: linear-gradient(145deg, #d94f2d, #992719);
  box-shadow: 0 4px 0 #772416, 0 8px 18px rgba(104, 39, 23, 0.2);
  font-family: "Noto Serif SC", STSong, SimSun, serif;
  font-size: 28px;
  transform: rotate(-2deg);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .brand strong {
  color: var(--stone-ink);
  font-family: "Noto Serif SC", STSong, SimSun, serif;
  font-size: clamp(29px, 2.35vw, 38px);
  letter-spacing: 0.08em;
  line-height: 1.08;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .brand small {
  display: block;
  margin-top: 5px;
  color: #654b37;
  font: 700 11px/1.2 Georgia, serif;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-chapter-tag {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  margin-left: 48px;
  padding: 7px 20px;
  border: 1px solid #d2a04f;
  border-radius: 13px;
  color: #9b301e;
  background: rgba(255, 247, 226, 0.9);
  box-shadow: inset 0 0 0 4px rgba(255, 255, 255, 0.65), 0 6px 14px rgba(95, 56, 26, 0.09);
  font: 700 16px/1.2 "Noto Serif SC", STSong, SimSun, serif;
  white-space: nowrap;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-header-cloud {
  display: block;
  width: 96px;
  height: 44px;
  flex: 0 0 auto;
  object-fit: contain;
  pointer-events: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar-switches {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 64px;
  margin-left: auto;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .chapter-mark,
body.reader-picturebook-v2[data-reader-theme="stone"] .scene-view-control {
  display: none !important;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch,
body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch {
  position: relative;
  inset: auto;
  display: grid;
  min-height: 56px;
  width: auto;
  margin: 0;
  padding: 5px;
  grid-auto-flow: column;
  grid-auto-columns: minmax(108px, 1fr);
  gap: 2px;
  border: 2px solid #d7ad66;
  border-radius: 13px;
  background: rgba(255, 250, 240, 0.96);
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.76), 0 0 0 1px rgba(162, 104, 42, 0.12), 0 7px 16px rgba(78, 52, 28, 0.1);
  transform: none;
  backdrop-filter: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch::before,
body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch::after,
body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch::before,
body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch::after {
  position: absolute;
  top: 50%;
  z-index: -1;
  width: 10px;
  height: 30px;
  border: 1px solid #d7ad66;
  content: "";
  background: #fff4d7;
  transform: translateY(-50%);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch::before,
body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch::before {
  left: -8px;
  border-right: 0;
  border-radius: 8px 0 0 8px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch::after,
body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch::after {
  right: -8px;
  border-left: 0;
  border-radius: 0 8px 8px 0;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch button,
body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch button {
  min-height: 43px;
  padding: 8px 17px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: #705d4b;
  background: transparent;
  font-size: 14px;
  box-shadow: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch button.is-active {
  border-color: #f0c579;
  color: #fffaf0;
  background: linear-gradient(145deg, #d14b2d, #a83321);
  box-shadow: inset 0 0 0 2px rgba(255, 236, 190, 0.28), inset 0 0 0 4px rgba(112, 43, 24, 0.16), 0 6px 13px rgba(80, 42, 24, 0.2);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch button.is-active {
  border-color: #b7cd8d;
  color: #fffaf0;
  background: linear-gradient(145deg, #61845a, #3e6843);
  box-shadow: inset 0 0 0 2px rgba(226, 241, 208, 0.25), inset 0 0 0 4px rgba(49, 86, 58, 0.15), 0 6px 13px rgba(55, 91, 57, 0.19);
}

/* Open-book structure. */
body.reader-picturebook-v2[data-reader-theme="stone"] .story-shell {
  position: fixed;
  z-index: 10;
  inset: 0;
  pointer-events: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book {
  position: fixed;
  top: 88px;
  left: 50%;
  display: grid;
  width: min(1512px, calc(100vw - 24px));
  height: min(910px, calc(100vh - 98px));
  min-height: 680px;
  grid-template-columns: minmax(0, 1fr) 18px minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr) var(--stone-dock-height);
  grid-template-areas:
    "read gutter art"
    "dock dock dock";
  transform: translateX(-50%);
  pointer-events: none;
  isolation: isolate;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book-frame {
  position: absolute;
  z-index: 6;
  top: -22px;
  left: -38px;
  width: calc(100% + 76px);
  height: calc(100% - var(--stone-dock-height) + 50px);
  object-fit: fill;
  pointer-events: none;
  user-select: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .story-card,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-art-page {
  position: relative;
  z-index: 2;
  min-width: 0;
  min-height: 0;
  pointer-events: auto;
  border: 0;
  background: var(--stone-paper);
  box-shadow: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .story-card {
  grid-area: read;
  width: auto;
  height: 100%;
  max-height: none;
  align-self: stretch;
  inset: auto;
  overflow: visible;
  padding: 17px 34px 25px 76px;
  border-radius: 26px 2px 4px 24px;
  background:
    radial-gradient(circle at 10% 13%, rgba(139, 190, 143, 0.12), transparent 25%),
    radial-gradient(circle at 18% 90%, rgba(239, 130, 97, 0.1), transparent 26%),
    linear-gradient(92deg, #fffaf0, #fffdf7 72%, #f5e8ce);
  backdrop-filter: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .story-card::before {
  position: absolute;
  inset: 18px auto 18px 8px;
  width: 9px;
  border-radius: 8px;
  content: "";
  opacity: 0.55;
  background: repeating-linear-gradient(90deg, #d7bc84 0 1px, transparent 1px 3px);
  pointer-events: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book-gutter {
  position: relative;
  z-index: 4;
  grid-area: gutter;
  background: linear-gradient(90deg, rgba(81, 46, 22, 0.13), rgba(255, 255, 255, 0.8) 45%, rgba(76, 40, 18, 0.15));
  box-shadow: inset 7px 0 10px rgba(76, 44, 24, 0.12), inset -7px 0 10px rgba(76, 44, 24, 0.14);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book-gutter::after {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  content: "";
  background: rgba(137, 91, 42, 0.24);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-art-page {
  grid-area: art;
  margin: 0;
  overflow: hidden;
  border-radius: 2px 26px 24px 4px;
  background: linear-gradient(90deg, #f7ead2, #fffaf0 6% 94%, #f4e5c8);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-art-page::after {
  position: absolute;
  z-index: 3;
  inset: 0 0 0 auto;
  width: 10px;
  content: "";
  opacity: 0.5;
  background: repeating-linear-gradient(90deg, transparent 0 2px, #d5b878 2px 3px);
  pointer-events: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .scene-stack {
  position: absolute;
  z-index: 1;
  inset: 13px 18px 17px 12px;
  width: auto;
  height: auto;
  max-height: none;
  overflow: hidden;
  transform: none;
  pointer-events: none;
  background: #eef1df;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .world-image,
body.reader-picturebook-v2[data-reader-theme="stone"] #classic-image,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-reference-art {
  position: absolute;
  z-index: 1;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  max-width: none;
  -webkit-mask-image: none;
  mask-image: none;
  filter: saturate(1.06) contrast(1.015) brightness(1.025);
  mix-blend-mode: normal;
  transform: none !important;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-reference-art {
  z-index: 2;
  opacity: 0;
  object-fit: var(--stone-reference-image-fit, cover);
  object-position: var(--stone-reference-image-position, center center);
  transition: opacity 260ms ease;
}

/* Image fit is configurable per chapter. The shared defaults fill 3D artwork
   while keeping original/classic plates fully visible. */
body.reader-picturebook-v2[data-reader-theme="stone"] .world-image {
  object-fit: var(--stone-world-image-fit, cover);
  object-position: var(--stone-world-image-position, center center);
}

body.reader-picturebook-v2[data-reader-theme="stone"] #classic-image {
  object-fit: var(--stone-classic-image-fit, contain);
  object-position: var(--stone-classic-image-position, center center);
}

body.reader-picturebook-v2[data-reader-theme="stone"].stone-scene-one:not(.is-classic) .stone-reference-art {
  opacity: 1;
}

body.reader-picturebook-v2[data-reader-theme="stone"].stone-scene-one:not(.is-classic) .world-image {
  opacity: 0 !important;
}

/* The scene-one reference illustration is a dedicated 3D cover image.  It must
   leave the stacking context completely when the reader selects the original
   artwork; opacity alone allowed it to keep masking the classic image in some
   cached/cross-fade states. */
body.reader-picturebook-v2[data-reader-theme="stone"].is-classic .stone-reference-art,
body.reader-picturebook-v2[data-reader-theme="stone"].is-classic .world-image {
  display: none !important;
  opacity: 0 !important;
}

body.reader-picturebook-v2[data-reader-theme="stone"].is-classic #classic-image {
  z-index: 3;
  inset: 0 !important;
  display: block !important;
  width: 100% !important;
  height: 100% !important;
  opacity: 1 !important;
  object-fit: var(--stone-classic-image-fit, contain) !important;
  object-position: var(--stone-classic-image-position, center center) !important;
  transform: none !important;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .scene-transition {
  display: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .scene-caption {
  position: absolute;
  z-index: 5;
  right: 54px;
  bottom: 30px;
  display: grid;
  min-width: 252px;
  gap: 3px;
  padding: 13px 20px;
  border: 2px solid #d4a459;
  border-radius: 14px;
  color: #4d2a1b;
  background: rgba(255, 249, 232, 0.94);
  box-shadow: inset 0 0 0 4px rgba(255, 255, 255, 0.7), 0 9px 20px rgba(69, 41, 22, 0.17);
  text-align: center;
  backdrop-filter: none;
  pointer-events: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .scene-caption span {
  display: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .scene-caption strong {
  display: block;
  font: 700 21px/1.2 "Noto Serif SC", STSong, SimSun, serif;
  letter-spacing: 0.12em;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .scene-caption small {
  display: block;
  color: #654b37;
  font-size: 13px;
  letter-spacing: 0.03em;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .scene-rail {
  display: none;
}

/* Left reading page. */
body.reader-picturebook-v2[data-reader-theme="stone"] .story-lang-switch {
  margin: 0;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .story-meta {
  display: block;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .story-heading {
  display: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .page-medallion {
  display: flex;
  width: 88px;
  height: 73px;
  align-items: center;
  justify-content: center;
  border: 1px solid #d7ac61;
  border-radius: 20px;
  color: #aa3822;
  background: rgba(255, 248, 224, 0.94);
  box-shadow: inset 0 0 0 5px rgba(255, 255, 255, 0.7), 0 4px 0 rgba(185, 130, 55, 0.14);
  font: 700 21px/1 Georgia, serif;
  transform: rotate(-1.5deg);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .ornament-line {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 11px 0 8px;
  color: var(--stone-gold);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .ornament-line::before,
body.reader-picturebook-v2[data-reader-theme="stone"] .ornament-line::after {
  height: 1px;
  flex: 1;
  content: "";
  background: linear-gradient(90deg, transparent, #d5a454 12%, #d5a454 88%, transparent);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .ornament-line i {
  width: 8px;
  height: 8px;
  border: 2px solid #cb8e35;
  border-radius: 1px;
  transform: rotate(45deg);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .story-text {
  display: grid;
  gap: 14px;
  margin-top: 5px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .story-text .sentence {
  position: relative;
  display: flex;
  min-width: 0;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 8px 10px;
  margin: 0;
  padding: 6px 52px 3px 0;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .story-text .sentence + .sentence {
  margin-top: 26px;
  padding-top: 19px;
  border-top: 1px solid rgba(207, 153, 68, 0.58);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit {
  position: relative;
  display: grid;
  min-width: max-content;
  min-height: 94px;
  grid-template-rows: auto 20px 34px 17px;
  place-items: start center;
  align-content: start;
  padding: 3px 4px 1px;
  border-radius: 12px;
  color: var(--stone-ink);
  transition: color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .ruby {
  display: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .word {
  grid-row: 1;
  color: inherit;
  font: 700 clamp(21px, 1.62vw, 26px)/1.12 Georgia, "Noto Serif SC", serif;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .ipa {
  grid-row: 2;
  color: var(--stone-muted);
  font: 700 13px/18px Georgia, "Segoe UI Symbol", serif;
  white-space: nowrap;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .reader-word-speak {
  grid-row: 3;
  display: grid;
  width: 32px;
  height: 32px;
  min-height: 32px;
  place-items: center;
  margin: 0;
  padding: 0;
  border: 1px solid rgba(74, 113, 70, 0.33);
  border-radius: 50%;
  color: var(--stone-jade);
  background: #f3f8eb;
  box-shadow: 0 3px 7px rgba(53, 85, 51, 0.1);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .reader-word-speak svg {
  width: 17px;
  height: 17px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .reader-word-speak:hover,
body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .reader-word-speak:focus-visible,
body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .reader-word-speak.is-playing {
  color: #fff8e8;
  background: var(--stone-jade);
  transform: translateY(-1px);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .reader-follow-grade {
  position: static;
  grid-row: 4;
  min-height: 17px;
  margin: 0;
  padding: 1px 7px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  line-height: 15px;
  white-space: nowrap;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit.reader-follow-reviewing {
  color: #a43b25;
  background: linear-gradient(180deg, rgba(255, 222, 129, 0.72), rgba(255, 242, 203, 0.3));
  box-shadow: 0 0 0 5px rgba(231, 173, 63, 0.18), 0 8px 16px rgba(129, 83, 30, 0.08);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit.reader-follow-retry {
  background: rgba(252, 223, 208, 0.48);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit.reader-follow-pass {
  background: rgba(219, 238, 214, 0.42);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .sentence-speak {
  position: absolute;
  top: 10px;
  right: 1px;
  display: grid;
  width: 45px;
  height: 45px;
  min-height: 45px;
  place-items: center;
  margin: 0;
  padding: 0;
  border: 1px solid rgba(201, 75, 39, 0.35);
  border-radius: 50%;
  color: var(--stone-cinnabar);
  background: #fff0dc;
  box-shadow: 0 5px 11px rgba(161, 60, 33, 0.12);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .sentence-speak svg {
  width: 21px;
  height: 21px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .story-text .sentence + .sentence .sentence-speak {
  top: 17px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .sentence-zh {
  color: var(--stone-ink);
  font: 700 clamp(22px, 2.1vw, 30px)/1.85 "Noto Serif SC", STSong, SimSun, serif;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .study-note,
body.reader-picturebook-v2[data-reader-theme="stone"] .scroll-cue {
  display: none;
}

/* Page turning stays discoverable without bringing back the old scene rail. */
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav {
  position: absolute;
  z-index: 14;
  inset: 0;
  display: block;
  margin: 0;
  padding: 0;
  border: 0;
  pointer-events: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav > button {
  position: absolute;
  top: calc(var(--stone-page-height) / 2 - 4px);
  display: grid;
  width: 54px;
  min-width: 54px;
  height: 92px;
  min-height: 92px;
  place-items: center;
  gap: 4px;
  transform: translateY(-50%);
  border: 2px solid #c38b3b;
  color: #6b2d20;
  background: linear-gradient(180deg, #fff9e8, #f0d7a4);
  box-shadow: inset 0 0 0 4px rgba(255, 251, 236, 0.82), 0 7px 0 #8f2f20, 0 12px 22px rgba(74, 39, 20, 0.2);
  pointer-events: auto;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav > button:hover:not(:disabled),
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav > button:focus-visible {
  color: #fff9e9;
  background: linear-gradient(180deg, #c74d2e, #982e20);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav > button:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav #prev-page {
  left: -10px;
  border-radius: 8px 20px 20px 8px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav #next-page {
  right: -10px;
  border-radius: 20px 8px 8px 20px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav button svg {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav button span {
  font: 700 12px/1.1 "Noto Serif SC", STSong, SimSun, serif;
  writing-mode: vertical-rl;
  letter-spacing: 0.1em;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav #scene-slug {
  display: none;
}

/* Follow-reading stage: preserve original controls and state machine, only recompose them. */
body.reader-picturebook-v2[data-reader-theme="stone"] .narration-controls.stone-coaching-dock:not([hidden]) {
  position: relative;
  z-index: 8;
  grid-area: dock;
  display: grid !important;
  min-width: 0;
  min-height: var(--stone-dock-height);
  width: auto;
  inset: auto;
  align-self: stretch;
  justify-self: stretch;
  transform: none;
  margin: -1px 0 0;
  padding: 29px 24px 20px;
  grid-template-columns: minmax(340px, 0.92fr) minmax(590px, 1.55fr) minmax(125px, 0.34fr);
  grid-template-areas: "main stages language";
  align-items: stretch;
  gap: 18px;
  border: 2px solid #d8b36e;
  border-radius: 0 0 28px 28px;
  background:
    radial-gradient(circle at 9% 0%, rgba(239, 167, 73, 0.14), transparent 27%),
    linear-gradient(180deg, rgba(255, 251, 239, 0.99), rgba(248, 231, 198, 0.99));
  box-shadow: 0 18px 34px rgba(80, 46, 22, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.85);
  pointer-events: auto;
  overflow: visible;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-frame {
  position: absolute;
  z-index: 1;
  inset: -16px -18px -13px;
  width: calc(100% + 36px);
  height: calc(100% + 29px);
  pointer-events: none;
  user-select: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-title,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-area,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-language {
  position: relative;
  z-index: 2;
  min-width: 0;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-title {
  position: absolute;
  z-index: 4;
  top: -17px;
  left: 37px;
  display: flex;
  width: 248px;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  color: #9c321f;
  font: 700 20px/1.2 "Noto Serif SC", STSong, SimSun, serif;
  letter-spacing: 0.08em;
  pointer-events: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-title svg {
  width: 19px;
  height: 19px;
  color: #d08a28;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main {
  grid-area: main;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr) 74px 74px;
  align-content: start;
  align-items: center;
  gap: 9px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-start,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-play,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-guide-speed-control,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-pause,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-stop {
  position: relative;
  min-width: 0;
  min-height: 52px;
  margin: 0;
  border-radius: 13px;
  font-size: 13px;
  font-weight: 700;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-start {
  grid-column: 1 / 3;
  grid-row: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 8px 14px;
  border: 2px solid #9f321f;
  color: #fff8e8;
  background: linear-gradient(145deg, #d14b2d, #a83321);
  box-shadow: inset 0 0 0 3px rgba(255, 218, 157, 0.22), 0 0 0 1px #e2a467, 0 9px 17px rgba(137, 48, 31, 0.2);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-start:disabled {
  border-color: #c5a696;
  color: rgba(255, 250, 240, 0.82);
  background: #d8b3a5;
  box-shadow: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-start.is-live,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-start.is-ready-to-read {
  background: linear-gradient(145deg, #ee8f28, #c65f22);
  box-shadow: 0 0 0 6px rgba(242, 166, 59, 0.18), 0 8px 18px rgba(180, 88, 24, 0.22);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-play {
  grid-column: 3 / 5;
  grid-row: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 13px;
  border: 2px solid #3f6a42;
  color: #fff9e9;
  background: linear-gradient(145deg, #61845a, #3e6843);
  box-shadow: inset 0 0 0 3px rgba(224, 239, 204, 0.2), 0 0 0 1px #8fab79, 0 9px 16px rgba(55, 91, 57, 0.18);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-guide-speed-control {
  grid-column: 1 / 3;
  grid-row: 2;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 9px;
  padding: 8px 14px;
  border: 2px solid #d5a14e;
  color: #755028;
  background: #fff6df;
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.6), 0 6px 12px rgba(130, 84, 30, 0.1);
}

body.reader-picturebook-v2[data-reader-theme="stone"] #reader-guide-speed-control select {
  min-width: 0;
  height: 42px;
  border: 0;
  color: #755028;
  background: transparent;
  font-weight: 700;
  text-align: right;
  outline: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-pause,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-stop {
  display: grid;
  width: 74px;
  place-items: center;
  padding: 4px;
  border: 2px solid #d5c3a0;
  color: #756d60;
  background: rgba(255, 251, 240, 0.76);
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.55);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-pause {
  grid-column: 3;
  grid-row: 2;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-stop {
  grid-column: 4;
  grid-row: 2;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-pause span,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-stop span {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-pause:disabled,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-stop:disabled {
  opacity: 0.42;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-hidden-control,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > .tts-voice-label,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-status {
  display: none !important;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-inline {
  grid-column: 1 / -1;
  grid-row: 3;
  display: flex;
  width: calc(100% - 48px);
  min-height: 58px;
  margin: 0 0 0 48px;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid rgba(139, 101, 57, 0.16);
  border-radius: 14px;
  background: rgba(255, 250, 240, 0.94);
  overflow: visible;
}

body.reader-picturebook-v2[data-reader-theme="stone"] #reader-follow-inline::before {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border-radius: 50%;
  content: "";
  background: var(--stone-jade);
  box-shadow: 0 0 0 5px rgba(78, 116, 77, 0.12);
}

body.reader-picturebook-v2[data-reader-theme="stone"] #reader-follow-inline.is-scoring {
  background: #fff2d7;
}

body.reader-picturebook-v2[data-reader-theme="stone"] #reader-follow-inline > strong,
body.reader-picturebook-v2[data-reader-theme="stone"] #reader-follow-inline > p {
  margin: 0;
}

body.reader-picturebook-v2[data-reader-theme="stone"] #reader-follow-inline > strong {
  color: #3e5f3f;
  font: 700 15px/1.25 "Noto Serif SC", STSong, SimSun, serif;
}

body.reader-picturebook-v2[data-reader-theme="stone"] #reader-follow-inline > p {
  color: #756a5c;
  font-size: 12px;
  line-height: 1.45;
}

body.reader-picturebook-v2[data-reader-theme="stone"] #reader-follow-inline .reader-follow-languages {
  display: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-area {
  grid-area: stages;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-steps {
  display: grid;
  height: 100%;
  min-height: 180px;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.25fr) minmax(0, 0.82fr);
  gap: 15px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step {
  --stone-stage-stroke: #dacaab;
  position: relative;
  display: grid;
  min-width: 0;
  grid-template-columns: 1fr;
  grid-template-rows: auto minmax(82px, 1fr);
  align-items: start;
  justify-items: center;
  gap: 6px;
  padding: 19px 10px 10px;
  border: 2px solid var(--stone-stage-stroke);
  border-radius: 23px;
  color: #5f584c;
  background: rgba(255, 250, 239, 0.9);
  box-shadow: 0 9px 18px rgba(76, 53, 29, 0.1);
  isolation: isolate;
  transition: border-color 160ms ease, background 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step::before {
  position: absolute;
  z-index: 0;
  inset: 5px;
  border: 1px solid rgba(150, 122, 82, 0.42);
  border-radius: 17px;
  content: "";
  pointer-events: none;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step-1 {
  --stone-stage-stroke: #8da875;
  color: #355c3d;
  background: linear-gradient(180deg, #fbfff3, #edf5df);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step-2 {
  --stone-stage-stroke: #eca239;
  color: #7b3f20;
  background: linear-gradient(180deg, #fffaf0, #fff0ce);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step-3 {
  --stone-stage-stroke: #cdbf9f;
  background: linear-gradient(180deg, #fffdf7, #f3ede0);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step.is-active {
  border-color: var(--stone-stage-stroke);
  box-shadow: 0 0 0 3px #fff7df, 0 0 0 6px rgba(236, 162, 57, 0.18), 0 13px 25px rgba(113, 67, 24, 0.14);
  transform: translateY(-2px);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step.is-done {
  color: #355c3d;
  background: #f1f7e9;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-number {
  position: absolute;
  z-index: 3;
  top: -14px;
  left: 14px;
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 2px solid #d6bd83;
  border-radius: 50%;
  color: #8b6541;
  background: #fff8e7;
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.72), 0 0 0 1px #cfa75e, 0 6px 11px rgba(91, 59, 30, 0.14);
  font: 700 21px/1 Georgia, serif;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step.is-active .stone-step-number {
  border-color: var(--stone-apricot);
  color: #fffaf0;
  background: var(--stone-apricot);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step.is-done .stone-step-number {
  border-color: var(--stone-jade);
  color: #fff;
  background: var(--stone-jade);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-copy,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-visual {
  position: relative;
  z-index: 1;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-copy {
  min-width: 0;
  text-align: center;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-copy strong,
body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-copy small {
  display: block;
  text-align: center;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-copy strong {
  font: 700 clamp(16px, 1.35vw, 20px)/1.25 "Noto Serif SC", STSong, SimSun, serif;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-copy small {
  margin-top: 5px;
  color: #817466;
  font-size: 12px;
  line-height: 1.35;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-visual {
  display: flex;
  width: 100%;
  min-height: 82px;
  align-self: end;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step-1 .stone-step-visual {
  justify-content: space-evenly;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-mascot-wrap {
  position: relative;
  display: grid;
  width: 78px;
  height: 88px;
  place-items: end center;
  overflow: hidden;
  border-radius: 0 0 22px 22px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-mascot-wrap img {
  position: relative;
  z-index: 2;
  display: block;
  width: 88px;
  max-width: none;
  mix-blend-mode: multiply;
  -webkit-mask-image: radial-gradient(ellipse 72% 74% at 50% 54%, #000 64%, transparent 82%);
  mask-image: radial-gradient(ellipse 72% 74% at 50% 54%, #000 64%, transparent 82%);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-wave {
  width: clamp(42px, 4vw, 62px);
  height: 52px;
  color: #4d9c68;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step-2 .stone-stage-wave:last-child {
  color: #f09a2b;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-microphone {
  display: grid;
  width: 78px;
  height: 78px;
  flex: 0 0 auto;
  place-items: center;
  border: 3px solid #fff2c8;
  border-radius: 50%;
  color: #fffdf4;
  background: linear-gradient(145deg, #ffb339, #ec7e22);
  box-shadow: 0 0 0 3px #e6972d, inset 0 0 0 5px rgba(255, 244, 205, 0.42), 0 9px 18px rgba(174, 83, 24, 0.23);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-microphone svg {
  width: 39px;
  height: 39px;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-comment {
  width: 74px;
  height: 74px;
  color: #8f897d;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-arrow {
  position: absolute;
  z-index: 4;
  top: calc(50% - 15px);
  right: -25px;
  width: 34px;
  height: 30px;
  padding: 4px;
  border-radius: 999px;
  color: #86a06e;
  background: #f8ebcd;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-language {
  grid-area: language;
  display: grid;
  align-content: center;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-language .reader-follow-languages {
  display: grid;
  padding: 7px;
  grid-auto-flow: row;
  grid-auto-rows: minmax(50px, auto);
  gap: 8px;
  border: 2px solid #d7ad66;
  border-radius: 16px;
  background: rgba(255, 250, 240, 0.95);
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.72), 0 7px 16px rgba(78, 52, 28, 0.1);
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-language .reader-follow-languages button {
  min-height: 52px;
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: #6b604f;
  background: transparent;
  font-size: 13px;
  font-weight: 700;
  white-space: normal;
}

body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-language .reader-follow-languages button.is-active {
  border-color: #7e9c70;
  color: #fff9e9;
  background: linear-gradient(145deg, #61845a, #3e6843);
  box-shadow: inset 0 0 0 2px rgba(218, 238, 197, 0.18), 0 7px 13px rgba(55, 91, 57, 0.16);
}

@media (max-width: 1280px) {
  body.reader-picturebook-v2[data-reader-theme="stone"] {
    --stone-dock-height: 232px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar.stone-story-header {
    padding-inline: 20px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .brand strong {
    font-size: 28px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-chapter-tag {
    margin-left: 20px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-header-cloud {
    width: 70px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar-switches {
    gap: 20px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch,
  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch {
    grid-auto-columns: minmax(88px, 1fr);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book {
    min-height: 640px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-card {
    padding: 17px 24px 20px 58px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .word {
    font-size: 21px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit {
    min-height: 86px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .narration-controls.stone-coaching-dock:not([hidden]) {
    grid-template-columns: minmax(300px, 0.92fr) minmax(500px, 1.55fr) minmax(116px, 0.34fr);
    gap: 13px;
    padding: 27px 18px 15px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-steps {
    min-height: 160px;
    gap: 11px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step {
    padding-inline: 7px;
  }
}

@media (max-width: 1050px) {
  body.reader-picturebook-v2[data-reader-theme="stone"] {
    --stone-dock-height: 320px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-header-cloud,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-chapter-tag {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar-switches {
    gap: 10px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch,
  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch {
    grid-auto-columns: minmax(72px, 1fr);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch button,
  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch button {
    padding-inline: 10px;
    font-size: 12px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .narration-controls.stone-coaching-dock:not([hidden]) {
    grid-template-columns: minmax(0, 1fr) 150px;
    grid-template-areas:
      "main language"
      "stages stages";
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-steps {
    min-height: 135px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-step-visual {
    min-height: 54px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-mascot-wrap {
    height: 58px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-microphone {
    width: 58px;
    height: 58px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-comment {
    width: 54px;
    height: 54px;
  }
}

@media (max-width: 900px) {
  body.reader-picturebook-v2[data-reader-theme="stone"] {
    --stone-dock-height: 220px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar.stone-story-header {
    top: 0;
    width: 100%;
    height: 74px;
    padding: 8px 12px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .seal {
    width: 42px;
    height: 47px;
    font-size: 21px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .brand strong {
    font-size: 20px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .brand small {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch {
    min-height: 48px;
    grid-auto-columns: minmax(64px, 1fr);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch button {
    min-height: 35px;
    padding: 6px 8px;
    font-size: 11px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book {
    top: 76px;
    width: calc(100vw - 16px);
    height: calc(100vh - 84px);
    min-height: 0;
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 1fr) 190px var(--stone-dock-height);
    grid-template-areas:
      "read"
      "art"
      "dock";
    gap: 7px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book-frame,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book-gutter,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-frame,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-title {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-card,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-art-page {
    border: 1px solid rgba(207, 158, 80, 0.46);
    border-radius: 22px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-card {
    overflow: hidden;
    padding: 14px 15px 10px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-card::before {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .page-medallion {
    width: 54px;
    height: 46px;
    font-size: 13px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .ornament-line {
    margin: 6px 0;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-text {
    gap: 4px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-text .sentence {
    gap: 3px 8px;
    padding-right: 40px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-text .sentence + .sentence {
    margin-top: 4px;
    padding-top: 7px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit {
    min-height: 67px;
    grid-template-rows: auto 14px 24px 12px;
    padding-inline: 2px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .word {
    font-size: 16px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .ipa {
    font-size: 9px;
    line-height: 13px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .reader-word-speak {
    width: 23px;
    height: 23px;
    min-height: 23px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .reader-word-speak svg {
    width: 13px;
    height: 13px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .sentence-speak {
    width: 36px;
    height: 36px;
    min-height: 36px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .scene-stack {
    inset: 7px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .scene-caption {
    right: 18px;
    bottom: 12px;
    min-width: 190px;
    padding: 8px 12px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .scene-caption strong {
    font-size: 16px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .scene-caption small {
    font-size: 11px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .narration-controls.stone-coaching-dock:not([hidden]) {
    grid-template-columns: 1fr;
    grid-template-areas: "main";
    min-height: var(--stone-dock-height);
    padding: 10px;
    border-radius: 20px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-area,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-language {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main {
    grid-template-columns: 1fr 1fr 48px 48px;
    gap: 7px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-start,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-play,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-guide-speed-control,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-pause,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-stop {
    min-height: 44px;
    font-size: 11px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-inline {
    min-height: 48px;
    width: 100%;
    margin-left: 0;
    padding: 6px 9px;
    overflow: hidden;
  }
}

@media (max-width: 600px) {
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 44px 44px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-start {
    grid-column: 1 / -1;
    grid-row: 1;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-play {
    grid-column: 1 / 3;
    grid-row: 2;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-pause {
    grid-column: 3;
    grid-row: 2;
    width: 44px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-stop {
    grid-column: 4;
    grid-row: 2;
    width: 44px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-guide-speed-control {
    grid-column: 1 / 3;
    grid-row: 3;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-inline {
    grid-column: 1 / -1;
    grid-row: 4;
  }
}

@media (max-width: 600px) {
  body.reader-picturebook-v2[data-reader-theme="stone"] {
    --stone-dock-height: 238px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .brand-copy {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch {
    width: calc(100vw - 78px);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book {
    grid-template-rows: minmax(0, 1fr) 160px var(--stone-dock-height);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-card {
    padding-inline: 11px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-text .sentence {
    column-gap: 6px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .word {
    font-size: 14px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .scene-caption {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main {
    grid-template-columns: 1fr 1fr 44px 44px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-follow-start {
    grid-column: 1 / -1;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #tts-play {
    grid-column: 1 / 3;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main > #reader-guide-speed-control {
    grid-column: 1 / 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-reference-art,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step,
  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit {
    transition: none;
  }
}

/*
 * 1536 x 1024 reference calibration.
 * The base reader deliberately uses an oversized scroll-world canvas; this
 * chapter is a self-contained picture-book spread, so keep it to one viewport.
 */
body.reader-picturebook-v2[data-reader-theme="stone"] {
  width: 100%;
  height: 100vh;
  min-height: 100vh;
  overflow: hidden;
}

@media (min-width: 901px) {
  /*
   * The original chapter controller maps the ten scenes to ten viewport-high
   * scroll stops. Keep that invisible scroll track so its existing next/prev
   * handlers can change scenes, while the redesigned book itself stays fixed.
   */
  body.reader-picturebook-v2[data-reader-theme="stone"] {
    height: 1000vh;
    min-height: 1000vh;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-width: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"]::-webkit-scrollbar {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar.stone-story-header {
    top: 8px;
    width: min(1512px, calc(100vw - 24px));
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .story-lang-switch {
    width: 392px;
    grid-auto-columns: 1fr;
    gap: 0;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .topbar .view-switch {
    width: 320px;
    grid-auto-columns: 1fr;
    gap: 0;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book {
    --stone-page-height: clamp(610px, 63vh, 642px);
    top: 94px;
    bottom: auto;
    width: min(1488px, calc(100vw - 48px));
    height: auto;
    min-height: 0;
    grid-template-rows: var(--stone-page-height) auto;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book-frame {
    top: -54px;
    height: calc(var(--stone-page-height) + 100px);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-card,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-art-page {
    border: 1px solid transparent;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-card {
    height: 100%;
    align-self: stretch;
    overflow: hidden;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .scene-stack {
    inset: 0;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .scene-caption {
    right: 72px;
    bottom: 54px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .page-medallion {
    width: 82px;
    border-width: 2px;
    border-radius: 17px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-text {
    padding-bottom: 0;
  }

  /* Chapter 01's second sentence is unusually dense. Do not shrink the same
     position in later chapters, whose sentence lengths differ. */
  body.chapter-01-stone-monkey.reader-picturebook-v2[data-reader-theme="stone"] .story-text .sentence:nth-child(2) {
    column-gap: 6px;
  }

  body.chapter-01-stone-monkey.reader-picturebook-v2[data-reader-theme="stone"] .story-text .sentence:nth-child(2) .word {
    font-size: clamp(20px, 1.5vw, 24px);
  }

  /* Later chapters use longer sentences than chapter 01. Keep both complete
     sentences inside the fixed book page instead of clipping the final line
     behind the coaching stage. This only changes spacing and type scale; the
     live word, IPA, audio and grading nodes remain untouched. */
  body.reader-picturebook-v2[data-reader-theme="stone"]:not(.chapter-01-stone-monkey) .story-text {
    gap: 8px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"]:not(.chapter-01-stone-monkey) .story-text .sentence {
    row-gap: 3px;
    column-gap: 6px;
    padding-top: 3px;
    padding-bottom: 1px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"]:not(.chapter-01-stone-monkey) .story-text .sentence + .sentence {
    margin-top: 12px;
    padding-top: 11px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"]:not(.chapter-01-stone-monkey) .word-unit {
    min-height: 78px;
    grid-template-rows: auto 18px 30px;
    padding: 1px 3px 0;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"]:not(.chapter-01-stone-monkey) .word-unit .word {
    font-size: clamp(19px, 1.42vw, 23px);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"]:not(.chapter-01-stone-monkey) .word-unit .ipa {
    font-size: 12px;
    line-height: 16px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"]:not(.chapter-01-stone-monkey) .word-unit .reader-word-speak {
    width: 28px;
    height: 28px;
    min-height: 28px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit {
    grid-template-rows: auto 20px 34px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .reader-follow-grade:empty {
    display: none;
  }

  /* Some later scenes contain substantially longer English copy. The skin
     marks only pages that actually overflow, preserving the normal type scale
     everywhere else while keeping every word inside the open-book page. */
  body.reader-picturebook-v2[data-reader-theme="stone"].stone-copy-dense .story-text {
    gap: 3px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"].stone-copy-dense .story-text .sentence {
    row-gap: 1px;
    column-gap: 3px;
    padding-top: 1px;
    padding-bottom: 0;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"].stone-copy-dense .story-text .sentence + .sentence {
    margin-top: 4px;
    padding-top: 6px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"].stone-copy-dense .word-unit {
    min-height: 68px;
    grid-template-rows: auto 15px 26px;
    padding-inline: 1px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"].stone-copy-dense .word-unit .word {
    font-size: clamp(17px, 1.2vw, 20px);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"].stone-copy-dense .word-unit .ipa {
    font-size: 10px;
    line-height: 14px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"].stone-copy-dense .word-unit .reader-word-speak {
    width: 25px;
    height: 25px;
    min-height: 25px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"].stone-copy-extra-dense .story-card {
    padding-top: 22px;
    padding-bottom: 14px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"].stone-copy-extra-dense .page-medallion {
    width: 68px;
    height: 60px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"].stone-copy-extra-dense .ornament-line {
    margin-block: 4px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .narration-controls.stone-coaching-dock:not([hidden]) {
    top: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    left: 0 !important;
    min-height: 252px;
    align-self: stretch !important;
    justify-self: stretch !important;
    transform: none !important;
    margin: 0;
    padding: 32px 25px 22px;
    border-color: transparent;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-frame {
    inset: -17px -22px -15px;
    width: calc(100% + 44px);
    height: calc(100% + 32px);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-title {
    top: -16px;
    left: 27px;
    width: 218px;
    min-height: 50px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-area,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-language {
    min-height: 205px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-language-source {
    display: none !important;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-language .stone-language-mirror {
    width: 100%;
    margin: 0;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step {
    padding: 21px 10px 10px;
    border-radius: 19px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-mascot-wrap {
    width: 106px;
    height: 118px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-mascot-wrap img {
    width: 112px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-wave {
    width: clamp(48px, 4.5vw, 70px);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-microphone {
    width: 104px;
    height: 104px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-comment {
    width: 96px;
    height: 96px;
  }
}

/*
 * 1080p monitors normally leave only about 900-950px for the webpage after
 * browser chrome. Keep the complete coaching stage in that first viewport
 * instead of letting the 610px page minimum push its lower half off-screen.
 */
@media (min-width: 901px) and (max-height: 950px) {
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book {
    --stone-page-height: clamp(555px, calc(100vh - 355px), 575px);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .narration-controls.stone-coaching-dock:not([hidden]) {
    min-height: 220px;
    padding: 28px 23px 16px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-main,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-area,
  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-dock-language {
    min-height: 172px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-flow-step {
    padding-top: 17px;
    padding-bottom: 8px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-mascot-wrap {
    width: 88px;
    height: 96px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-mascot-wrap img {
    width: 94px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-microphone {
    width: 88px;
    height: 88px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-stage-comment {
    width: 80px;
    height: 80px;
  }

  /* Chapter 01 has the densest second sentence. On a 1080p monitor the
     browser chrome leaves about 917px, so tighten only the vertical rhythm;
     keep the reading type size unchanged. */
  body.chapter-01-stone-monkey.reader-picturebook-v2[data-reader-theme="stone"] .story-text {
    gap: 8px;
  }

  body.chapter-01-stone-monkey.reader-picturebook-v2[data-reader-theme="stone"] .story-text .sentence {
    row-gap: 3px;
  }

  body.chapter-01-stone-monkey.reader-picturebook-v2[data-reader-theme="stone"] .story-text .sentence + .sentence {
    margin-top: 14px;
    padding-top: 13px;
  }

  body.chapter-01-stone-monkey.reader-picturebook-v2[data-reader-theme="stone"] .word-unit {
    min-height: 86px;
    grid-template-rows: auto 18px 30px;
  }

  body.chapter-01-stone-monkey.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .ipa {
    line-height: 16px;
  }

  body.chapter-01-stone-monkey.reader-picturebook-v2[data-reader-theme="stone"] .word-unit .reader-word-speak {
    width: 28px;
    height: 28px;
    min-height: 28px;
  }
}

@media (max-width: 900px) {
  body.reader-picturebook-v2[data-reader-theme="stone"] {
    width: 100%;
    height: 1000vh;
    min-height: 1000vh;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-width: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"]::-webkit-scrollbar {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] #app {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100vh;
    min-height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] #app::-webkit-scrollbar {
    display: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-shell {
    position: relative;
    inset: auto;
    min-height: 100vh;
    padding-top: 76px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-book {
    position: relative;
    top: auto;
    left: auto;
    width: calc(100% - 16px);
    height: auto;
    min-height: 0;
    grid-template-rows: auto clamp(190px, 50vw, 360px) auto auto;
    grid-template-areas:
      "read"
      "art"
      "dock"
      "nav";
    margin: 0 auto 16px;
    transform: none;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .story-card {
    height: auto;
    min-height: 0;
    overflow: hidden;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-art-page {
    height: auto;
    min-height: 190px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .narration-controls.stone-coaching-dock:not([hidden]) {
    height: auto;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav {
    position: relative;
    inset: auto;
    grid-area: nav;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 10px;
    padding: 8px 4px 2px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav > button {
    position: static;
    width: auto;
    min-width: 112px;
    height: 46px;
    min-height: 46px;
    display: inline-flex;
    transform: none;
    border-radius: 14px;
    box-shadow: inset 0 0 0 3px rgba(255, 251, 236, 0.82), 0 4px 0 #8f2f20, 0 8px 15px rgba(74, 39, 20, 0.14);
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav #prev-page {
    grid-column: 1;
    justify-self: start;
    border-radius: 14px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav #next-page {
    grid-column: 3;
    justify-self: end;
    border-radius: 14px;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav button span {
    writing-mode: horizontal-tb;
    letter-spacing: 0.04em;
  }

  body.reader-picturebook-v2[data-reader-theme="stone"] .stone-page-nav #scene-slug {
    display: inline;
    grid-column: 2;
    color: #7d5d40;
    font: 700 13px/1 "Noto Serif SC", STSong, SimSun, serif;
    white-space: nowrap;
  }
}