:root {
  --book-blue: #21a7f0;
  --book-green: #8ac43d;
  --book-orange: #ffae2f;
  --book-red: #f54f7a;
  --book-ink: #172a3f;
  --book-ink-soft: #51657d;
  --book-line: rgba(23, 42, 63, 0.16);
  --book-line-strong: rgba(23, 42, 63, 0.24);
  --book-paper: rgba(255, 255, 255, 0.93);
  --book-paper-soft: rgba(255, 255, 255, 0.84);
  --book-shadow: 0 18px 42px rgba(17, 44, 70, 0.08);
}

.books-library-page,
.book-viewer-page,
.learning-studio-page,
.learning-games-page {
  color: var(--book-ink);
  background:
    radial-gradient(circle at 8% 10%, rgba(33, 167, 240, 0.08), transparent 34%),
    radial-gradient(circle at 91% 14%, rgba(138, 196, 61, 0.07), transparent 33%),
    radial-gradient(circle at 86% 90%, rgba(255, 174, 47, 0.08), transparent 34%),
    radial-gradient(circle at 14% 88%, rgba(245, 79, 122, 0.06), transparent 32%),
    linear-gradient(180deg, #fbfdff 0%, #f8fbff 55%, #fdfaf8 100%);
}

.books-library-page .page-main,
.learning-studio-page .page-main,
.learning-games-page .page-main {
  padding-bottom: clamp(2.5rem, 5vw, 4.5rem);
}

.books-library-shell,
.learning-studio-shell {
  width: min(1200px, calc(100% - 2rem));
  margin: clamp(1.3rem, 3vw, 2.3rem) auto 0;
  display: grid;
  gap: clamp(1rem, 2.4vw, 1.6rem);
}

.books-hero {
  border: 1px solid var(--book-line);
  border-radius: 1.1rem;
  background: var(--book-paper-soft);
  box-shadow: var(--book-shadow);
  padding: clamp(1rem, 2.4vw, 1.8rem);
  display: grid;
  gap: 1rem;
}

.books-hero h1 {
  font-size: clamp(1.8rem, 3.8vw, 2.9rem);
  margin: 0;
}

.books-hero p {
  color: var(--book-ink-soft);
}

.books-hero-top {
  display: grid;
  gap: 0.7rem;
}

.books-hero-top .eyebrow {
  background: rgba(255, 255, 255, 0.76);
  border-color: var(--book-line);
  color: var(--book-ink);
}

.books-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.books-stat {
  border: 1px solid var(--book-line);
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.82);
  padding: 0.8rem 0.9rem;
  display: grid;
  gap: 0.28rem;
}

.books-stat span {
  color: var(--book-ink-soft);
  font-size: 0.85rem;
}

.books-stat strong {
  font-size: 1.25rem;
}

.books-filter-row {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.books-summary {
  color: var(--book-ink-soft);
  font-size: 0.92rem;
}

.books-route-board {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 0.8rem;
}

.books-route-intro,
.books-route-feed {
  border: 1px solid var(--book-line);
  border-radius: 1rem;
  background: var(--book-paper-soft);
  box-shadow: var(--book-shadow);
  padding: 0.9rem;
  display: grid;
  gap: 0.62rem;
}

.books-route-intro h2,
.books-route-feed h3 {
  margin: 0;
}

.books-route-intro p {
  margin: 0;
  color: var(--book-ink-soft);
}

.books-route-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.46rem;
}

.books-route-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.7rem;
}

.books-mission-list {
  display: grid;
  gap: 0.52rem;
}

.books-mission-chip {
  border: 1px solid var(--book-line);
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.84);
  padding: 0.62rem;
  display: grid;
  gap: 0.45rem;
}

.books-mission-head {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  align-items: baseline;
  flex-wrap: wrap;
}

.books-mission-head span {
  color: var(--book-ink-soft);
  font-size: 0.75rem;
}

.books-mission-copy {
  margin: 0;
  color: var(--book-ink-soft);
  font-size: 0.84rem;
  line-height: 1.45;
}

.books-mission-meta {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.books-mission-meta span {
  border: 1px solid var(--book-line);
  border-radius: 999px;
  padding: 0.16rem 0.48rem;
  font-size: 0.7rem;
  color: var(--book-ink-soft);
  background: rgba(255, 255, 255, 0.72);
}

.books-mission-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.book-card {
  border: 1px solid var(--book-line);
  border-radius: 1rem;
  background: var(--book-paper);
  padding: 0.92rem;
  display: grid;
  gap: 0.8rem;
  box-shadow: 0 10px 24px rgba(17, 44, 70, 0.06);
}

.book-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
}

.book-spine-tag {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--book-line);
  border-radius: 999px;
  padding: 0.26rem 0.58rem;
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--book-ink-soft);
}

.book-favorite {
  border: 1px solid var(--book-line);
  border-radius: 0.65rem;
  background: rgba(255, 255, 255, 0.85);
  color: var(--book-ink-soft);
  font: inherit;
  font-size: 0.79rem;
  font-weight: 700;
  padding: 0.35rem 0.55rem;
  cursor: pointer;
}

.book-favorite.is-active {
  border-color: rgba(245, 79, 122, 0.55);
  color: #8d2849;
  background: rgba(245, 79, 122, 0.12);
}

.book-cover-shell {
  border: 1px solid var(--book-line);
  border-radius: 0.9rem;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.52)),
    linear-gradient(140deg, rgba(33, 167, 240, 0.12), rgba(138, 196, 61, 0.09) 42%, rgba(255, 174, 47, 0.08) 74%, rgba(245, 79, 122, 0.08));
  padding: 0.82rem;
  display: grid;
  gap: 0.38rem;
}

.book-cover-title {
  font-weight: 800;
  font-size: 1.05rem;
}

.book-cover-subtitle {
  font-size: 0.86rem;
  color: var(--book-ink-soft);
}

.book-cover-meta {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.book-cover-meta span {
  border: 1px solid var(--book-line);
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
  font-size: 0.72rem;
  color: var(--book-ink-soft);
  background: rgba(255, 255, 255, 0.7);
}

.book-card-copy {
  color: var(--book-ink-soft);
  font-size: 0.9rem;
  line-height: 1.5;
}

.book-card-meta {
  margin: -0.22rem 0 0;
  color: var(--book-ink-soft);
  font-size: 0.78rem;
}

.book-card-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.book-card--blue .book-cover-shell { border-color: rgba(33, 167, 240, 0.34); }
.book-card--green .book-cover-shell { border-color: rgba(138, 196, 61, 0.36); }
.book-card--orange .book-cover-shell { border-color: rgba(255, 174, 47, 0.42); }
.book-card--red .book-cover-shell { border-color: rgba(245, 79, 122, 0.34); }

.books-resume {
  border: 1px solid var(--book-line);
  border-radius: 1rem;
  background: var(--book-paper-soft);
  box-shadow: var(--book-shadow);
  padding: 0.95rem;
  display: grid;
  gap: 0.7rem;
}

.books-resume h2 {
  font-size: 1.1rem;
  margin: 0;
}

.resume-list {
  display: grid;
  gap: 0.55rem;
}

.resume-chip {
  border: 1px solid var(--book-line);
  border-radius: 0.8rem;
  padding: 0.68rem 0.78rem;
  background: rgba(255, 255, 255, 0.78);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
}

.resume-chip p {
  margin: 0.15rem 0 0;
  color: var(--book-ink-soft);
  font-size: 0.78rem;
}

.book-empty,
.viewer-fail {
  border: 1px dashed var(--book-line-strong);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.72);
  padding: 1rem;
  color: var(--book-ink-soft);
}

.book-empty h3,
.viewer-fail h2 {
  margin: 0 0 0.4rem;
}

.book-viewer-page {
  min-height: 100vh;
  color: var(--book-ink);
  background:
    radial-gradient(circle at 10% 12%, rgba(33, 167, 240, 0.1), transparent 32%),
    radial-gradient(circle at 88% 14%, rgba(138, 196, 61, 0.09), transparent 35%),
    radial-gradient(circle at 88% 88%, rgba(255, 174, 47, 0.08), transparent 34%),
    radial-gradient(circle at 14% 88%, rgba(245, 79, 122, 0.07), transparent 33%),
    linear-gradient(180deg, #fcfeff 0%, #f7fbff 56%, #fdf9f7 100%);
}

.book-viewer-root {
  width: min(1360px, calc(100% - 1rem));
  margin: 0 auto;
  min-height: 100vh;
  padding: 0.8rem 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 18rem);
  gap: 0.8rem;
  align-items: start;
}

.book-viewer-main {
  display: grid;
  gap: 0.75rem;
}

.viewer-topbar {
  border: 1px solid var(--book-line);
  border-radius: 0.85rem;
  background: rgba(255, 255, 255, 0.9);
  padding: 0.66rem 0.78rem;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.7rem;
}

.viewer-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--book-line);
  border-radius: 0.7rem;
  padding: 0.45rem 0.7rem;
  background: rgba(255, 255, 255, 0.85);
  color: var(--book-ink);
  font-weight: 700;
  cursor: pointer;
}

.viewer-title-group {
  display: grid;
  gap: 0.14rem;
  text-align: center;
}

.viewer-title-group strong {
  font-size: 1rem;
  line-height: 1.2;
}

.viewer-title-group span {
  font-size: 0.79rem;
  color: var(--book-ink-soft);
}

.viewer-toolbar {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.viewer-toolbar button,
.viewer-toolbar .btn {
  min-height: 2rem;
  font-size: 0.78rem;
  padding: 0.35rem 0.58rem;
}

.viewer-stage {
  position: relative;
  border: 1px solid var(--book-line);
  border-radius: 1rem;
  background:
    linear-gradient(90deg, rgba(23, 42, 63, 0.05), transparent 12%, transparent 88%, rgba(23, 42, 63, 0.05)),
    rgba(255, 255, 255, 0.86);
  box-shadow: var(--book-shadow);
  min-height: min(82vh, 880px);
  padding: clamp(0.95rem, 2.4vw, 1.4rem);
}

.viewer-sheet {
  position: relative;
  border: 1px solid rgba(17, 44, 70, 0.18);
  border-radius: 0.95rem;
  background: #fff;
  box-shadow: 0 22px 40px rgba(17, 44, 70, 0.09);
  min-height: min(74vh, 790px);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
  transform-origin: center center;
}

.viewer-sheet::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(22, 40, 62, 0.055), transparent 11%, transparent 89%, rgba(22, 40, 62, 0.05)),
    repeating-linear-gradient(180deg, rgba(18, 36, 58, 0.03) 0, rgba(18, 36, 58, 0.03) 1px, transparent 1px, transparent 32px);
}

.viewer-sheet-head,
.viewer-sheet-foot {
  position: relative;
  z-index: 1;
  padding: 0.8rem 0.95rem;
  border-bottom: 1px solid rgba(17, 44, 70, 0.12);
  background: rgba(255, 255, 255, 0.9);
}

.viewer-sheet-foot {
  border-bottom: 0;
  border-top: 1px solid rgba(17, 44, 70, 0.12);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.viewer-sheet-meta {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
}

.viewer-sheet-meta strong {
  font-size: 1.18rem;
  line-height: 1.22;
}

.viewer-sheet-meta span {
  font-size: 0.8rem;
  color: var(--book-ink-soft);
}

.viewer-content {
  position: relative;
  z-index: 1;
  padding: 0.9rem 0.95rem;
  overflow: auto;
  display: grid;
  gap: 0.7rem;
  align-content: start;
}

.viewer-content p,
.viewer-content li,
.viewer-content td {
  color: var(--book-ink-soft);
  line-height: 1.62;
}

.viewer-content h3,
.viewer-content h4 {
  margin: 0;
  font-size: 1rem;
}

.viewer-block-list ul {
  margin: 0;
  padding-left: 1rem;
  display: grid;
  gap: 0.32rem;
}

.viewer-block-note,
.viewer-block-callout {
  border: 1px solid var(--book-line);
  border-radius: 0.8rem;
  padding: 0.62rem 0.75rem;
  background: rgba(248, 251, 255, 0.84);
  display: grid;
  gap: 0.36rem;
}

.viewer-block-note strong {
  font-size: 0.83rem;
}

.viewer-block-quote {
  margin: 0;
  border-left: 3px solid rgba(33, 167, 240, 0.5);
  padding: 0.48rem 0.72rem;
  border-radius: 0.6rem;
  background: rgba(33, 167, 240, 0.08);
  color: var(--book-ink-soft);
}

.viewer-block-terms table {
  width: 100%;
  border-collapse: collapse;
}

.viewer-block-terms th,
.viewer-block-terms td {
  border-bottom: 1px solid rgba(17, 44, 70, 0.12);
  text-align: left;
  padding: 0.36rem 0.32rem;
  font-size: 0.88rem;
}

.viewer-controls {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.viewer-controls button {
  border: 1px solid var(--book-line);
  border-radius: 0.62rem;
  background: rgba(255, 255, 255, 0.88);
  color: var(--book-ink);
  padding: 0.38rem 0.66rem;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
}

.viewer-controls button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.viewer-sheet-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: flex-end;
}

.viewer-action-link {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--book-line);
  border-radius: 999px;
  padding: 0.27rem 0.52rem;
  font-size: 0.76rem;
  color: var(--book-ink-soft);
  background: rgba(255, 255, 255, 0.86);
}

.viewer-side {
  display: grid;
  gap: 0.66rem;
  position: sticky;
  top: 0.75rem;
  align-self: start;
}

.viewer-panel {
  border: 1px solid var(--book-line);
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 26px rgba(17, 44, 70, 0.06);
  padding: 0.75rem;
  display: grid;
  gap: 0.6rem;
}

.viewer-panel h3 {
  margin: 0;
  font-size: 0.95rem;
}

.viewer-mark-tools {
  display: grid;
  gap: 0.45rem;
}

.viewer-mark-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.viewer-mark-row button {
  border: 1px solid var(--book-line);
  border-radius: 0.62rem;
  padding: 0.32rem 0.52rem;
  font: inherit;
  font-size: 0.73rem;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.84);
  cursor: pointer;
}

.viewer-mark-row [data-mark-color="yellow"] { background: rgba(255, 235, 135, 0.5); }
.viewer-mark-row [data-mark-color="green"] { background: rgba(174, 225, 146, 0.46); }
.viewer-mark-row [data-mark-color="orange"] { background: rgba(255, 204, 130, 0.52); }
.viewer-mark-row [data-mark-color="underline"] { background: rgba(217, 227, 242, 0.6); }

.viewer-note-input {
  min-height: 7rem;
  resize: vertical;
}

.viewer-toc {
  position: fixed;
  left: 0.7rem;
  top: 0.7rem;
  bottom: 0.7rem;
  width: min(21rem, calc(100% - 1.4rem));
  border: 1px solid var(--book-line);
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 22px 40px rgba(17, 44, 70, 0.18);
  padding: 0.82rem;
  z-index: 80;
  transform: translateX(-118%);
  transition: transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 0.6rem;
}

.viewer-toc.is-open {
  transform: translateX(0);
}

.viewer-toc-list {
  display: grid;
  gap: 0.42rem;
  overflow: auto;
}

.toc-row {
  border: 1px solid var(--book-line);
  border-radius: 0.72rem;
  background: rgba(255, 255, 255, 0.84);
  text-align: left;
  padding: 0.52rem 0.6rem;
  display: grid;
  gap: 0.2rem;
  cursor: pointer;
}

.toc-row strong {
  font-size: 0.86rem;
}

.toc-row span {
  font-size: 0.74rem;
  color: var(--book-ink-soft);
}

.toc-row.is-active {
  border-color: rgba(33, 167, 240, 0.45);
  background: rgba(33, 167, 240, 0.12);
}

.viewer-mark {
  border-radius: 0.2rem;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.viewer-mark--yellow { background: rgba(255, 235, 135, 0.62); }
.viewer-mark--green { background: rgba(174, 225, 146, 0.58); }
.viewer-mark--orange { background: rgba(255, 204, 130, 0.62); }
.viewer-mark--underline {
  background: transparent;
  border-bottom: 2px solid rgba(33, 167, 240, 0.62);
}

.viewer-sheet.is-turn-next {
  animation: viewerTurnNext 190ms ease both;
}

.viewer-sheet.is-turn-prev {
  animation: viewerTurnPrev 190ms ease both;
}

.viewer-sheet.is-turn-in {
  animation: viewerTurnIn 190ms ease both;
}

@keyframes viewerTurnNext {
  0% { transform: perspective(1200px) rotateY(0deg) scale(1); opacity: 1; }
  100% { transform: perspective(1200px) rotateY(-8deg) translateX(-12px) scale(0.986); opacity: 0.56; }
}

@keyframes viewerTurnPrev {
  0% { transform: perspective(1200px) rotateY(0deg) scale(1); opacity: 1; }
  100% { transform: perspective(1200px) rotateY(8deg) translateX(12px) scale(0.986); opacity: 0.56; }
}

@keyframes viewerTurnIn {
  0% { transform: perspective(1200px) rotateY(4deg) scale(0.988); opacity: 0.6; }
  100% { transform: perspective(1200px) rotateY(0deg) scale(1); opacity: 1; }
}

.learning-studio-shell {
  gap: 0.8rem;
}

.studio-head {
  border: 1px solid var(--book-line);
  border-radius: 0.95rem;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--book-shadow);
  padding: 0.84rem;
  display: grid;
  gap: 0.7rem;
}

.studio-head-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.studio-title h1 {
  margin: 0;
  font-size: clamp(1.4rem, 2.7vw, 2rem);
}

.studio-title p {
  margin: 0.2rem 0 0;
  font-size: 0.86rem;
  color: var(--book-ink-soft);
}

.studio-mode-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.studio-mode-row button {
  border: 1px solid var(--book-line);
  border-radius: 0.62rem;
  background: rgba(255, 255, 255, 0.84);
  color: var(--book-ink-soft);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.34rem 0.55rem;
  cursor: pointer;
}

.studio-mode-row button.is-active {
  border-color: rgba(33, 167, 240, 0.52);
  background: rgba(33, 167, 240, 0.12);
  color: var(--book-ink);
}

.studio-workspace {
  --studio-split: 52%;
  border: 1px solid var(--book-line);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--book-shadow);
  min-height: min(82vh, 920px);
  display: grid;
  grid-template-columns: minmax(0, var(--studio-split)) 14px minmax(0, calc(100% - var(--studio-split)));
  overflow: hidden;
}

.studio-workspace.is-full-left {
  grid-template-columns: 1fr 0 0;
}

.studio-workspace.is-full-right {
  grid-template-columns: 0 0 1fr;
}

.studio-pane {
  min-width: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
}

.studio-pane-head {
  border-bottom: 1px solid var(--book-line);
  padding: 0.62rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.studio-pane-head button {
  border: 1px solid var(--book-line);
  border-radius: 0.62rem;
  background: rgba(255, 255, 255, 0.82);
  color: var(--book-ink-soft);
  font: inherit;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.5rem;
  cursor: pointer;
}

.studio-pane-head button.is-active {
  border-color: rgba(33, 167, 240, 0.45);
  color: var(--book-ink);
  background: rgba(33, 167, 240, 0.11);
}

.studio-pane-body {
  min-height: 0;
  overflow: auto;
  padding: 0.66rem;
  display: none;
  align-content: start;
  gap: 0.6rem;
}

.studio-pane-body.is-active {
  display: grid;
}

.studio-splitter {
  border-left: 1px solid var(--book-line);
  border-right: 1px solid var(--book-line);
  background: rgba(246, 249, 254, 0.95);
  position: relative;
  cursor: col-resize;
}

.studio-splitter::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 34px;
  transform: translate(-50%, -50%);
  border-radius: 999px;
  background: radial-gradient(circle at center, rgba(33, 167, 240, 0.52) 0 2px, transparent 3px),
    radial-gradient(circle at center, rgba(33, 167, 240, 0.52) 0 2px, transparent 3px),
    radial-gradient(circle at center, rgba(33, 167, 240, 0.52) 0 2px, transparent 3px);
  background-size: 5px 10px;
  background-position: center 0, center 12px, center 24px;
  background-repeat: no-repeat;
}

.studio-book-page {
  border: 1px solid var(--book-line);
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.9);
  padding: 0.64rem;
  display: grid;
  gap: 0.55rem;
}

.studio-book-page header span {
  color: var(--book-ink-soft);
  font-size: 0.75rem;
}

.studio-book-page header h3 {
  margin: 0.1rem 0 0;
  font-size: 0.95rem;
}

.studio-book-body {
  display: grid;
  gap: 0.55rem;
}

.studio-book-block,
.studio-media-card,
.studio-card-item {
  border: 1px solid var(--book-line);
  border-radius: 0.7rem;
  background: rgba(255, 255, 255, 0.86);
  padding: 0.58rem 0.64rem;
}

.studio-book-block h4,
.studio-media-card h4,
.studio-card-item strong {
  margin: 0;
  font-size: 0.85rem;
}

.studio-book-block ul {
  margin: 0;
  padding-left: 1rem;
  display: grid;
  gap: 0.24rem;
}

.studio-book-block table {
  width: 100%;
  border-collapse: collapse;
}

.studio-book-block th,
.studio-book-block td {
  border-bottom: 1px solid rgba(17, 44, 70, 0.12);
  text-align: left;
  padding: 0.28rem 0.22rem;
  font-size: 0.82rem;
}

.studio-book-quote {
  margin: 0;
  border-left: 3px solid rgba(33, 167, 240, 0.5);
  padding: 0.45rem 0.62rem;
  background: rgba(33, 167, 240, 0.08);
  border-radius: 0.6rem;
  color: var(--book-ink-soft);
}

.studio-book-paragraph {
  margin: 0;
  color: var(--book-ink-soft);
}

.studio-schema-grid {
  display: grid;
  gap: 0.45rem;
}

.studio-schema-grid span {
  border: 1px solid var(--book-line);
  border-radius: 0.62rem;
  background: rgba(255, 255, 255, 0.85);
  padding: 0.5rem 0.62rem;
  font-size: 0.84rem;
}

.studio-note {
  width: 100%;
  min-height: 16rem;
  resize: vertical;
  border: 1px solid var(--book-line);
  border-radius: 0.75rem;
  background: rgba(255, 255, 255, 0.9);
  color: var(--book-ink);
  padding: 0.68rem;
  font: inherit;
}

.studio-note-foot {
  display: flex;
  justify-content: flex-end;
  color: var(--book-ink-soft);
  font-size: 0.76rem;
}

.studio-draw-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.studio-draw-controls label {
  font-size: 0.76rem;
  color: var(--book-ink-soft);
}

.studio-draw-canvas {
  width: 100%;
  height: min(58vh, 440px);
  border: 1px solid var(--book-line);
  border-radius: 0.75rem;
  background: #fff;
  touch-action: none;
}

.studio-card-form {
  display: grid;
  gap: 0.5rem;
}

.studio-card-form input,
.studio-card-form textarea {
  border: 1px solid var(--book-line);
  border-radius: 0.7rem;
  padding: 0.5rem 0.6rem;
  font: inherit;
  background: rgba(255, 255, 255, 0.9);
}

.studio-card-form textarea {
  min-height: 5.6rem;
  resize: vertical;
}

.studio-card-list {
  display: grid;
  gap: 0.5rem;
}

.studio-card-item {
  display: grid;
  gap: 0.45rem;
}

.studio-card-item p {
  margin: 0.2rem 0 0;
  color: var(--book-ink-soft);
  font-size: 0.84rem;
}

.games-shell {
  width: min(1280px, calc(100% - 2rem));
  margin: clamp(1.3rem, 3vw, 2.3rem) auto 0;
  display: grid;
  gap: 0.86rem;
}

.games-hero {
  border: 1px solid var(--book-line);
  border-radius: 1rem;
  background: var(--book-paper-soft);
  box-shadow: var(--book-shadow);
  padding: 0.95rem;
  display: grid;
  gap: 0.8rem;
}

.games-hero-top {
  display: grid;
  gap: 0.58rem;
}

.games-hero-top h1 {
  margin: 0;
  font-size: clamp(1.72rem, 3.6vw, 2.7rem);
}

.games-hero-top p {
  margin: 0;
  color: var(--book-ink-soft);
}

.games-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}

.games-stat {
  border: 1px solid var(--book-line);
  border-radius: 0.84rem;
  background: rgba(255, 255, 255, 0.8);
  padding: 0.66rem 0.78rem;
  display: grid;
  gap: 0.24rem;
}

.games-stat span {
  color: var(--book-ink-soft);
  font-size: 0.8rem;
}

.games-stat strong {
  font-size: 1.22rem;
}

.games-filter-row {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) repeat(3, minmax(0, 1fr));
  gap: 0.58rem;
}

.games-summary {
  color: var(--book-ink-soft);
  margin: 0;
  font-size: 0.9rem;
}

.games-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(17rem, 19rem);
  gap: 0.82rem;
}

.games-main-col {
  display: grid;
  gap: 0.8rem;
}

.games-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.68rem;
}

.games-card {
  border: 1px solid var(--book-line);
  border-radius: 0.92rem;
  background: var(--book-paper);
  box-shadow: 0 10px 22px rgba(17, 44, 70, 0.06);
  padding: 0.76rem;
  display: grid;
  gap: 0.52rem;
}

.games-card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}

.games-card-head span {
  border: 1px solid var(--book-line);
  border-radius: 999px;
  padding: 0.16rem 0.46rem;
  font-size: 0.72rem;
  color: var(--book-ink-soft);
  background: rgba(255, 255, 255, 0.82);
}

.games-card-copy {
  margin: 0;
  color: var(--book-ink-soft);
  font-size: 0.83rem;
  line-height: 1.44;
}

.games-card-meta,
.games-card-books,
.games-card-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.36rem;
}

.games-card-meta span,
.games-card-books span,
.games-card-skills span {
  border: 1px solid var(--book-line);
  border-radius: 999px;
  padding: 0.14rem 0.45rem;
  font-size: 0.69rem;
  color: var(--book-ink-soft);
  background: rgba(255, 255, 255, 0.74);
}

.games-card-actions {
  display: flex;
  gap: 0.42rem;
  flex-wrap: wrap;
}

.games-side-col {
  display: grid;
  gap: 0.66rem;
  position: sticky;
  top: 0.72rem;
  align-self: start;
}

.games-side-panel {
  border: 1px solid var(--book-line);
  border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 24px rgba(17, 44, 70, 0.06);
  padding: 0.72rem;
  display: grid;
  gap: 0.58rem;
}

.games-side-panel h2 {
  margin: 0;
  font-size: 0.98rem;
}

.games-focus-list,
.games-history-list {
  display: grid;
  gap: 0.5rem;
}

.games-focus-card,
.games-focus-chip,
.games-history-chip {
  border: 1px solid var(--book-line);
  border-radius: 0.74rem;
  background: rgba(255, 255, 255, 0.84);
  padding: 0.56rem;
  display: grid;
  gap: 0.35rem;
}

.games-focus-card p,
.games-focus-chip p,
.games-history-chip p {
  margin: 0;
  color: var(--book-ink-soft);
  font-size: 0.8rem;
  line-height: 1.42;
}

.games-focus-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.34rem;
}

.games-focus-meta span {
  border: 1px solid var(--book-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--book-ink-soft);
  font-size: 0.68rem;
  padding: 0.13rem 0.42rem;
}

.games-focus-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.games-history-chip span {
  color: var(--book-ink-soft);
  font-size: 0.69rem;
}

.games-playground {
  border: 1px solid var(--book-line);
  border-radius: 0.95rem;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--book-shadow);
  padding: 0.84rem;
  display: grid;
  gap: 0.62rem;
}

.games-playground-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.66rem;
}

.games-playground-title h2 {
  margin: 0.16rem 0 0;
  font-size: 1.18rem;
}

.games-session-mode {
  border: 1px solid var(--book-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  color: var(--book-ink-soft);
  font-size: 0.72rem;
  padding: 0.14rem 0.45rem;
}

.games-session-progress {
  display: grid;
  gap: 0.3rem;
}

.games-session-progress span {
  font-size: 0.8rem;
  color: var(--book-ink-soft);
}

.games-session-progress-track {
  border: 1px solid var(--book-line);
  border-radius: 999px;
  height: 0.58rem;
  background: rgba(248, 251, 255, 0.88);
  overflow: hidden;
}

.games-session-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, rgba(33, 167, 240, 0.58), rgba(138, 196, 61, 0.55));
  transition: width 160ms ease;
}

.games-question-card {
  border: 1px solid var(--book-line);
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.86);
  padding: 0.7rem;
  display: grid;
  gap: 0.52rem;
}

.games-question-card h3,
.games-question-card p {
  margin: 0;
}

.games-option-list {
  display: grid;
  gap: 0.42rem;
}

.games-option-btn {
  border: 1px solid var(--book-line);
  border-radius: 0.68rem;
  background: rgba(255, 255, 255, 0.9);
  color: var(--book-ink);
  font: inherit;
  text-align: left;
  padding: 0.52rem 0.58rem;
  cursor: pointer;
}

.games-option-btn:disabled {
  cursor: default;
}

.games-option-btn.is-correct {
  border-color: rgba(138, 196, 61, 0.55);
  background: rgba(138, 196, 61, 0.16);
}

.games-option-btn.is-wrong {
  border-color: rgba(245, 79, 122, 0.52);
  background: rgba(245, 79, 122, 0.14);
}

.games-session-feedback {
  min-height: 1.3rem;
  color: var(--book-ink-soft);
  font-size: 0.83rem;
}

.games-session-feedback.is-success {
  color: #2f6a1f;
}

.games-session-feedback.is-info {
  color: #264664;
}

.games-session-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.44rem;
}

@media (max-width: 1180px) {
  .books-grid {
    grid-template-columns: 1fr;
  }

  .books-route-board {
    grid-template-columns: 1fr;
  }

  .book-viewer-root {
    grid-template-columns: 1fr;
  }

  .viewer-side {
    position: static;
  }

  .games-grid {
    grid-template-columns: 1fr;
  }

  .games-layout {
    grid-template-columns: 1fr;
  }

  .games-side-col {
    position: static;
  }
}

@media (max-width: 980px) {
  .books-filter-row {
    grid-template-columns: 1fr;
  }

  .books-stats {
    grid-template-columns: 1fr;
  }

  .games-stats {
    grid-template-columns: 1fr;
  }

  .games-filter-row {
    grid-template-columns: 1fr;
  }

  .studio-workspace,
  .studio-workspace.is-full-left,
  .studio-workspace.is-full-right {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
  }

  .studio-splitter {
    display: none;
  }
}

@media (max-width: 760px) {
  .viewer-topbar {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .viewer-title-group {
    text-align: left;
  }

  .viewer-sheet-head,
  .viewer-sheet-foot,
  .viewer-content {
    padding-inline: 0.75rem;
  }

  .games-playground-head {
    flex-direction: column;
    align-items: stretch;
  }

  .games-session-actions {
    flex-direction: column;
  }

  .games-session-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .viewer-sheet,
  .viewer-sheet.is-turn-next,
  .viewer-sheet.is-turn-prev,
  .viewer-sheet.is-turn-in,
  .viewer-toc {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }
}