* {
  box-sizing: border-box;
}

:root {
  --control-rail-width: clamp(196px, 12vw, 228px);
  --compact-rail-width: 92px;
  --desk-dark: #6f4c2f;
  --desk-mid: #987149;
  --desk-light: #b48758;
  --panel-bg: #eae3dc;
  --panel-bg-strong: #f4eee8;
  --panel-translucent: rgba(234, 227, 220, .97);
  --panel-button-bg: #fff7ee;
  --panel-border: #d8cabb;
  --panel-text: #241d16;
  --panel-muted: #6d5642;
  /* Refined accents for a classy, professional panel */
  --panel-card: #fffdf9;
  --header-bg: linear-gradient(135deg, #2d2219 0%, #3c2d20 100%);
  --header-text: #fbf4ea;
  --accent: #b3801f;
  --accent-strong: #946914;
  --panel-shadow: -10px 16px 46px rgba(38, 26, 16, .30);
  --card-shadow: 0 1px 2px rgba(38, 26, 16, .06);
  --card-shadow-hover: 0 4px 14px rgba(38, 26, 16, .14);
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--desk-mid);
  color: var(--panel-text);
  font-family: Arial, Helvetica, sans-serif;
}

body {
  overflow: hidden;
}

button,
input {
  font: inherit;
}

.reader-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--control-rail-width);
  grid-template-rows: auto minmax(0, 1fr);
  height: 100vh;
  min-height: 0;
  overflow: hidden;
}

.reader-topbar {
  align-content: start;
  align-items: stretch;
  background: var(--panel-translucent);
  border-bottom: 1px solid var(--panel-border);
  border-left: 1px solid var(--panel-border);
  display: grid;
  gap: 12px;
  grid-column: 2;
  grid-row: 1;
  grid-template-columns: 1fr;
  min-height: 0;
  padding: 14px;
}

.reader-brand {
  align-items: center;
  color: var(--panel-muted);
  display: flex;
  font-size: 11px;
  font-weight: 650;
  letter-spacing: .18em;
  line-height: 1.2;
  min-height: 34px;
  min-width: 0;
  text-decoration: none;
  text-transform: uppercase;
}

.reader-brand-logo {
  display: block;
  height: auto;
  max-height: 42px;
  max-width: 100%;
  object-fit: contain;
  object-position: left center;
  width: auto;
}

.reader-brand.has-logo .reader-brand-label {
  display: none;
}

.reader-context {
  align-items: start;
  display: grid;
  gap: 4px;
  min-width: 0;
}

.reader-status {
  color: var(--panel-text);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.route-note {
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  color: var(--panel-text);
  display: -webkit-box;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -.01em;
  line-height: 1.3;
  min-width: 0;
  overflow: hidden;
}

/* Transient boot status only — the footer owns the page number once ready. */
.reader-ready .reader-status {
  display: none;
}

.toolbar-actions {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(3, 1fr);
}

.toolbar-actions .icon-button svg,
.ask-hero svg {
  fill: none;
  height: 17px;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  width: 17px;
}

/* The rail's single hero action. */
.ask-hero {
  align-items: center;
  background: var(--header-bg);
  border: 0;
  border-radius: 11px;
  box-shadow: 0 6px 16px rgba(40, 26, 12, .25);
  color: var(--header-text);
  cursor: pointer;
  display: grid;
  font-size: 14px;
  font-weight: 650;
  gap: 10px;
  grid-template-columns: 24px minmax(0, 1fr);
  letter-spacing: .01em;
  min-height: 46px;
  isolation: isolate;
  overflow: hidden;
  padding: 8px 12px;
  position: relative;
  transition: filter .14s ease, transform .12s ease, box-shadow .14s ease;
  width: 100%;
}

.ask-hero span {
  line-height: 1.2;
  text-align: left;
  white-space: normal;
}

.ask-hero::after {
  animation: ask-hero-shimmer 4.8s ease-in-out infinite;
  background: linear-gradient(105deg, transparent 34%, rgba(255, 255, 255, .22) 50%, transparent 66%);
  content: "";
  inset: 0;
  pointer-events: none;
  position: absolute;
  transform: translateX(-125%);
  z-index: 0;
}

.ask-hero > * {
  position: relative;
  z-index: 1;
}

.ask-hero svg {
  animation: ask-hero-sparkle 2.8s ease-in-out infinite;
  transform-origin: center;
}

@keyframes ask-hero-shimmer {
  0%, 66% { transform: translateX(-125%); }
  100% { transform: translateX(125%); }
}

@keyframes ask-hero-sparkle {
  0%, 100% { opacity: .82; transform: scale(.96); }
  50% { opacity: 1; transform: scale(1.08); }
}

.ask-hero:hover {
  box-shadow: 0 8px 20px rgba(40, 26, 12, .32);
  filter: brightness(1.12);
  transform: translateY(-1px);
}

.reader-button,
.icon-button {
  align-items: center;
  background: var(--panel-button-bg);
  border: 1px solid var(--panel-border);
  border-radius: 7px;
  color: var(--panel-text);
  cursor: pointer;
  display: inline-flex;
  font-size: 13px;
  font-weight: 600;
  justify-content: center;
  min-height: 34px;
  padding: 6px 12px;
  text-decoration: none;
  transition: background .14s ease, border-color .14s ease, box-shadow .14s ease, transform .14s ease;
  white-space: nowrap;
}

.reader-button:hover:not(:disabled),
.icon-button:hover:not(:disabled) {
  border-color: var(--accent);
  box-shadow: var(--card-shadow-hover);
}

.reader-button::after,
.icon-button::after {
  content: "";
}

.icon-button {
  min-width: 42px;
  padding-inline: 10px;
}

.reader-button:disabled,
.icon-button:disabled {
  cursor: not-allowed;
  opacity: .45;
}

.reader-stage {
  align-items: center;
  background:
    radial-gradient(ellipse at center, rgba(255, 244, 224, .08), rgba(52, 32, 19, .12) 72%),
    linear-gradient(rgba(90, 58, 36, .08), rgba(90, 58, 36, .08)),
    url("assets/desk-surface.jpg"),
    linear-gradient(115deg, var(--desk-dark), var(--desk-mid) 42%, var(--desk-light) 72%, #7e5937);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  display: grid;
  grid-column: 1;
  grid-row: 1 / span 2;
  justify-items: center;
  min-height: 0;
  overflow: hidden;
  padding: 10px 12px;
  position: relative;
}

/* Signed automation mode: make the book the whole viewport and remove reader
   chrome from captured media. Public query parameters cannot enable this mode. */
body.reader-render-mode .reader-shell {
  display: block;
  height: 100vh;
}

body.reader-render-mode .reader-stage {
  height: 100vh;
  padding: 0;
  width: 100vw;
}

body.reader-render-mode .reader-topbar,
body.reader-render-mode .reader-controls,
body.reader-render-mode .nav-arrow,
body.reader-render-mode .page-turn-zone,
body.reader-render-mode .reader-backdrop,
body.reader-render-mode .reader-drawer,
body.reader-render-mode .innovation-panel {
  display: none !important;
}

.flip-book {
  height: auto;
  margin: auto;
  max-height: 100%;
  max-width: 100%;
  width: min(100%, var(--reader-book-width, 1304px));
}

.page {
  background: #fff;
  height: 780px;
  overflow: hidden;
  width: 652px;
}

.page-clip {
  height: 780px;
  overflow: hidden;
  transform-origin: 0 0;
  width: 652px;
}

.page iframe {
  border: 0;
  display: block;
  height: 780px;
  pointer-events: auto;
  transform-origin: 0 0;
  width: 652px;
}

.flip-book.is-edge-turning .page iframe {
  pointer-events: none;
}

.page-turn-zone {
  background: transparent;
  border: 0;
  cursor: pointer;
  display: block;
  padding: 0;
  position: absolute;
  touch-action: none;
  user-select: none;
  z-index: 25;
}

.page-turn-zone:disabled {
  cursor: default;
  pointer-events: none;
}

.page-turn-zone:focus-visible {
  background: rgba(246, 166, 53, .16);
  outline: 2px solid rgba(246, 166, 53, .9);
  outline-offset: -2px;
}

.nav-arrow {
  align-items: center;
  background: rgba(42, 31, 23, .56);
  border: 1px solid rgba(255, 245, 226, .3);
  border-radius: 999px;
  color: #fff9ed;
  cursor: pointer;
  display: flex;
  font-size: 34px;
  height: 54px;
  justify-content: center;
  line-height: 1;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 54px;
  z-index: 30;
}

.nav-arrow:hover,
.nav-arrow:focus-visible {
  background: rgba(42, 31, 23, .78);
  outline: 2px solid rgba(246, 166, 53, .9);
}

.nav-prev {
  left: 14px;
}

.nav-next {
  right: 14px;
}

.innovation-dock {
  align-content: start;
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr;
  max-width: 100%;
  overflow: auto;
}

.innovation-dock:empty {
  display: none;
}

.innovation-pill {
  background: var(--panel-card);
  border: 1px solid var(--panel-border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  box-shadow: var(--card-shadow);
  color: var(--panel-text);
  cursor: pointer;
  display: grid;
  gap: 2px;
  min-height: 36px;
  padding: 9px 12px;
  text-align: left;
  transition: transform .12s ease, box-shadow .14s ease, border-color .14s ease;
  width: 100%;
}

.innovation-pill .k {
  color: var(--panel-muted);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.innovation-pill .t {
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  display: -webkit-box;
  font-size: 13px;
  font-weight: 550;
  line-height: 1.35;
  overflow: hidden;
}

.innovation-pill.innovation-chatbot {
  align-items: center;
  gap: 10px;
  grid-template-columns: 28px minmax(0, 1fr);
}

.innovation-chatbot .chatbot-bubble-icon {
  fill: none;
  height: 26px;
  justify-self: center;
  stroke: var(--accent-strong);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  width: 26px;
}

.innovation-chatbot .t {
  -webkit-line-clamp: 4;
  font-size: 12px;
  line-height: 1.3;
}

.innovation-pill:hover {
  border-color: var(--accent);
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-1px);
}

.innovation-pill::after {
  content: "";
}

.reader-controls {
  align-content: start;
  align-items: stretch;
  background: var(--panel-translucent);
  border-left: 1px solid var(--panel-border);
  display: grid;
  gap: 14px;
  grid-column: 2;
  grid-row: 2;
  grid-template-columns: 1fr;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: 0;
  overflow: auto;
  padding: 14px;
}

.rail-foot {
  align-content: end;
  display: grid;
  gap: 6px;
}

.page-label {
  color: var(--panel-text);
  font-size: 13px;
  font-weight: 700;
  min-width: 0;
  white-space: nowrap;
}

.page-scrubber {
  accent-color: var(--accent);
  cursor: pointer;
  width: 100%;
}

.reader-backdrop {
  background: rgba(43, 31, 21, .36);
  inset: 0;
  position: fixed;
  z-index: 80;
}

.reader-backdrop[hidden] {
  display: none;
}

.reader-drawer,
.innovation-panel {
  background: var(--panel-card);
  border: 1px solid rgba(255, 255, 255, .5);
  border-radius: 16px;
  box-shadow: var(--panel-shadow);
  color: var(--panel-text);
  display: grid;
  grid-template-rows: auto auto 1fr;
  height: auto;
  max-height: calc(100vh - 32px);
  max-width: 420px;
  overflow: hidden;
  position: fixed;
  right: 16px;
  top: 16px;
  bottom: 16px;
  width: min(420px, 92vw);
  z-index: 100;
}

.innovation-panel {
  grid-template-rows: auto minmax(0, 1fr) auto;
}

.reader-drawer[hidden],
.innovation-panel[hidden] {
  display: none;
}

.drawer-head,
.innovation-head {
  align-items: center;
  background: var(--header-bg);
  border-bottom: 2px solid var(--accent);
  color: var(--header-text);
  display: flex;
  gap: 12px;
  justify-content: space-between;
  padding: 15px 18px;
}

.drawer-head h2,
.innovation-head h2 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .2px;
  line-height: 1.25;
  margin: 0;
}

.drawer-head .icon-button,
.innovation-head .icon-button,
.drawer-head [data-close-panel],
.innovation-head [data-close-panel] {
  background: rgba(255, 255, 255, .14);
  border: 1px solid rgba(255, 255, 255, .26);
  border-radius: 999px;
  color: var(--header-text);
  flex: 0 0 auto;
  font-size: 12px;
  min-height: 30px;
  min-width: 30px;
  padding: 4px 13px;
}

.drawer-head .icon-button:hover,
.innovation-head .icon-button:hover,
.drawer-head [data-close-panel]:hover,
.innovation-head [data-close-panel]:hover {
  background: rgba(255, 255, 255, .26);
  border-color: rgba(255, 255, 255, .4);
  box-shadow: none;
}

.drawer-search {
  background: var(--panel-button-bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  margin: 16px 18px 12px;
  min-height: 40px;
  padding: 9px 12px;
  width: calc(100% - 36px);
}

.drawer-list {
  display: grid;
  gap: 8px;
  margin: 0;
  overflow: auto;
  padding: 0 14px 16px;
}

.drawer-item {
  background: var(--panel-button-bg);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  color: var(--panel-text);
  cursor: pointer;
  display: grid;
  gap: 4px;
  padding: 11px 12px;
  text-align: left;
}

.drawer-item strong {
  font-size: 14px;
  line-height: 1.25;
}

.drawer-item span {
  color: var(--panel-muted);
  font-size: 12px;
}

.drawer-item:hover {
  border-color: var(--accent);
  box-shadow: var(--card-shadow-hover);
}

.drawer-item.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(179, 128, 31, .26);
}

.innovation-body {
  font-size: 15px;
  line-height: 1.5;
  margin-top: 0;
  overflow: auto;
  padding: 18px;
}

.innovation-body p {
  margin: 0 0 12px;
}

.addon-intro {
  color: var(--panel-muted);
  font-size: 14px;
}

.addon-status {
  align-items: center;
  background: rgba(179, 128, 31, .08);
  border: 1px solid rgba(179, 128, 31, .28);
  border-radius: 8px;
  color: var(--panel-muted);
  display: flex;
  font-size: 13px;
  gap: 8px;
  margin-top: 12px;
  padding: 10px 12px;
}

.addon-status::before {
  background: var(--accent);
  border-radius: 999px;
  content: "";
  flex: 0 0 auto;
  height: 8px;
  width: 8px;
}

.addon-status[data-tone="success"] {
  background: rgba(224, 244, 232, .9);
  border-color: #98c8a4;
  color: #23552f;
}

.addon-status[data-tone="error"] {
  background: rgba(252, 232, 229, .9);
  border-color: #d69a92;
  color: #7d2c24;
}

.audio-addon-list {
  display: grid;
  gap: 12px;
}

.audio-addon-track {
  background: rgba(255, 247, 238, .72);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  display: grid;
  gap: 8px;
  padding: 12px;
}

.audio-addon-track h3 {
  font-size: 15px;
  line-height: 1.25;
  margin: 0;
}

.audio-addon-meta {
  color: var(--panel-muted);
  font-size: 12px;
  margin: 0;
}

.audio-addon-track audio {
  width: 100%;
}

.audio-addon-cover {
  aspect-ratio: 16 / 9;
  border-radius: 4px;
  height: auto;
  object-fit: cover;
  width: 100%;
}

.runtime-convo-panel {
  margin-top: 12px;
}

.runtime-convo-panel #convo-ai.convo-inline {
  margin: 0;
  width: 100%;
}

.runtime-convo-panel #convo-ai .convo-panel {
  background: rgba(255, 247, 238, .72);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 10px;
}

.innovation-actions {
  align-self: end;
  background: var(--panel-bg-strong);
  border-top: 1px solid var(--panel-border);
  display: flex;
  gap: 10px;
  margin-top: 0;
  padding: 14px 18px;
}

.innovation-actions .reader-button {
  flex: 1;
}

#innovationLaunch {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

#innovationLaunch:hover:not(:disabled) {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  box-shadow: var(--card-shadow-hover);
}

.empty-state {
  color: #6b6258;
  font-size: 14px;
  margin: 0;
}

@media (max-width: 1199px) {
  :root {
    --control-rail-width: var(--compact-rail-width);
  }

  .reader-shell {
    grid-template-columns: minmax(0, 1fr) var(--control-rail-width);
  }

  .reader-stage {
    padding: 8px 10px;
  }

  .reader-topbar,
  .reader-controls {
    gap: 8px;
    padding: 10px 8px;
  }

  .reader-topbar {
    justify-items: stretch;
  }

  .reader-brand {
    align-items: center;
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    display: flex;
    font-size: 0;
    height: 34px;
    justify-content: center;
    width: 100%;
  }

  .reader-brand::before {
    content: attr(data-initial);
    font-size: 16px;
    font-weight: 800;
    line-height: 1;
  }

  .reader-brand.has-logo::before {
    display: none;
  }

  .reader-brand-logo {
    max-height: 24px;
    max-width: 68px;
    object-position: center;
  }

  .reader-context {
    justify-items: center;
  }

  .reader-status {
    font-size: 11px;
    line-height: 1.15;
    text-align: center;
    white-space: normal;
  }

  .route-note {
    display: none;
  }

  .toolbar-actions {
    gap: 6px;
  }

  .toolbar-actions {
    grid-template-columns: 1fr;
  }

  .toolbar-actions .reader-button,
  .toolbar-actions .icon-button {
    font-size: 0;
    line-height: 1;
    min-height: 36px;
    min-width: 0;
    padding: 5px 4px;
    width: 100%;
  }

  .ask-hero {
    gap: 6px;
    grid-template-columns: 18px minmax(0, 1fr);
    min-height: 52px;
    padding: 7px 6px;
  }

  .ask-hero span {
    display: block;
    font-size: 9px;
    line-height: 1.1;
    text-align: left;
  }

  .reader-controls {
    grid-template-rows: minmax(0, 1fr) auto;
  }

  .page-label {
    font-size: 11px;
    line-height: 1.12;
    text-align: center;
    white-space: normal;
  }

  .page-scrubber {
    height: 140px;
    justify-self: center;
    width: 30px;
    writing-mode: vertical-lr;
  }

  .innovation-dock {
    gap: 6px;
  }

  .innovation-pill {
    line-height: 1;
    min-height: 36px;
    overflow: hidden;
    padding: 5px 4px;
  }

  .innovation-pill .k,
  .innovation-pill .t {
    display: none;
  }

  .innovation-pill::after {
    content: attr(data-compact-label);
    font-size: 11px;
    font-weight: 700;
    line-height: 1.05;
    white-space: normal;
  }

  .nav-arrow {
    font-size: 30px;
    height: 46px;
    width: 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ask-hero::after,
  .ask-hero svg {
    animation: none;
  }
}

@media (max-width: 900px) {
  :root {
    --compact-rail-width: 84px;
  }

  .reader-stage {
    padding: 8px;
  }
}