:root {
  --accent: #5b00e6;
  --ink: #292431;
  --muted: #706a78;
  --paper: #fffdfb;
  --shell: #f3f1f6;
  --panel: #ffffff;
  --line: rgba(41, 36, 49, 0.14);
  --header-height: 60px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--shell);
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--shell);
  color: var(--ink);
}

button,
a,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

svg {
  display: block;
}

.loading-screen,
.error-screen {
  display: grid;
  min-height: 100vh;
  place-content: center;
  padding: 32px;
  text-align: center;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: var(--header-height);
  padding: 8px 18px;
  background: var(--accent);
  color: white;
  box-shadow: 0 5px 18px rgba(40, 33, 30, 0.16);
}

.brand-button,
.top-actions,
.cta-button,
.panel-cta,
.ghost-button,
.whatsapp-button {
  display: inline-flex;
  align-items: center;
}

.brand-button {
  gap: 10px;
  min-width: 0;
  border: 0;
  background: transparent;
  color: inherit;
}

.brand-mark {
  display: grid;
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  place-content: center;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 850;
}

.brand-logo-shell {
  display: grid;
  flex: 0 0 58px;
  width: 58px;
  height: 42px;
  overflow: hidden;
  place-content: center;
  border-radius: 6px;
  background: white;
}

.brand-logo {
  display: block;
  width: 58px;
  height: 50px;
  transform: scale(1.22);
  object-fit: contain;
}

.brand-name {
  overflow: hidden;
  max-width: 320px;
  font-size: 1rem;
  font-weight: 780;
  letter-spacing: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.top-actions {
  gap: 8px;
  flex-shrink: 0;
}

.icon-button,
.counter-button,
.cta-button,
.panel-cta,
.ghost-button {
  min-height: 40px;
  border: 0;
  border-radius: 7px;
  text-decoration: none;
}

.icon-button {
  flex-shrink: 0;
  display: grid;
  width: 42px;
  place-content: center;
  background: rgba(255, 255, 255, 0.14);
  color: inherit;
}

.icon-button svg {
  width: 21px;
  height: 21px;
}

.icon-button:hover,
.counter-button:hover {
  background: rgba(255, 255, 255, 0.25);
}

.icon-button.dark {
  background: rgba(40, 33, 30, 0.07);
  color: var(--ink);
}

.counter-button {
  width: 124px;
  flex: 0 0 124px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  padding: 0 13px;
  background: rgba(255, 255, 255, 0.14);
  color: white;
  font-weight: 820;
}

.cta-button {
  justify-content: center;
  gap: 8px;
  max-width: 270px;
  padding: 0 17px;
  overflow: hidden;
  background: white;
  color: var(--accent);
  font-weight: 820;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.catalog-shell {
  position: relative;
  min-height: calc(100vh - var(--header-height));
}

.reader-stage {
  position: relative;
  display: grid;
  min-height: calc(100vh - var(--header-height));
  place-items: center;
  padding: 18px 70px 118px;
}

.book-wrap {
  display: block;
  width: min(calc(100vw - 148px), calc(140.909vh - 295.909px));
  width: min(calc(100vw - 148px), calc((100svh - 210px) * 1.40909));
  height: min(calc(70.9677vw - 105.032px), calc(100vh - 210px));
  height: min(calc((100vw - 148px) * 0.709677), calc(100svh - 210px));
  aspect-ratio: 1240 / 880;
  min-width: 0;
  margin: 0 auto;
}

.book {
  width: 100%;
  height: 100%;
}

.book .stf__wrapper { width: 100%; height: 100%; }

.book:not(.stf__parent):not(.fallback-book) .catalog-page { display: none; }

.catalog-page {
  position: relative;
  overflow: hidden;
  background: var(--paper);
  box-shadow: 0 18px 42px rgba(40, 33, 30, 0.2);
}

.catalog-page img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--paper);
  user-select: none;
}

.video-sheet {
  display: grid;
  grid-template-rows: auto repeat(var(--video-count), minmax(0, 1fr)) auto;
  width: 100%;
  height: 100%;
  padding: 3%;
  gap: 2%;
  background: #fff;
}

.video-sheet h2 { margin: 0; font-size: 16px; text-align: center; }
.video-item { display: grid; grid-template-rows: minmax(0, 1fr) auto; min-height: 0; margin: 0; gap: 3px; }
.video-frame { container-type: size; min-height: 0; display: grid; place-items: center; }
.page-video { display: block; width: min(100cqw, 177.777cqh); height: auto; max-height: 100%; aspect-ratio: 16 / 9; background: #17151b; touch-action: manipulation; }
.video-item figcaption { font-size: 11px; text-align: center; line-height: 1.2; color: var(--muted); }
.video-footer { margin: 0; padding-top: 2px; font-size: 11px; font-weight: 600; line-height: 1.25; text-align: center; color: var(--ink); }

.fallback-book {
  display: grid;
  width: min(100%, 620px);
}

.fallback-book .catalog-page {
  aspect-ratio: 620 / 880;
}

.page-hotspot {
  touch-action: manipulation;
  position: absolute;
  z-index: 8;
  display: flex;
  align-items: center;
  transform: translate(-50%, -50%);
  color: white;
  text-decoration: none;
}

.page-hotspot > * { pointer-events: none; }

.hotspot-icon {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  place-content: center;
  border: 2px solid white;
  border-radius: 50%;
  background: #20252d;
  box-shadow: 0 7px 18px rgba(25, 24, 24, 0.28);
  transition: transform 160ms ease, background 160ms ease;
}

.hotspot-icon svg {
  width: 20px;
  height: 20px;
}

.hotspot-label {
  position: absolute;
  left: calc(100% + 8px);
  width: max-content;
  max-width: 230px;
  padding: 7px 10px;
  transform: translateX(-5px);
  border-radius: 5px;
  background: rgba(32, 37, 45, 0.94);
  box-shadow: 0 7px 18px rgba(25, 24, 24, 0.22);
  font-size: 0.72rem;
  font-weight: 760;
  line-height: 1.25;
  opacity: 0;
  pointer-events: none;
  transition: opacity 140ms ease, transform 140ms ease;
}

.page-hotspot:hover .hotspot-icon,
.page-hotspot:focus-visible .hotspot-icon {
  outline: none;
  transform: scale(1.08);
  background: var(--accent);
}

.page-hotspot:hover .hotspot-label,
.page-hotspot:focus-visible .hotspot-label {
  transform: translateX(0);
  opacity: 1;
}

.side-nav {
  position: absolute;
  z-index: 12;
  top: calc(50% - 48px);
  display: grid;
  width: 50px;
  height: 70px;
  place-content: center;
  transform: translateY(-50%);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  box-shadow: 0 12px 28px rgba(40, 33, 30, 0.14);
}

.side-nav:hover {
  background: white;
}

.side-nav svg {
  width: 28px;
  height: 28px;
}

.side-nav-left {
  left: 16px;
}

.side-nav-right {
  right: 16px;
}

.course-panel {
  position: fixed;
  z-index: 24;
  right: 76px;
  bottom: 14px;
  left: 76px;
  display: grid;
  grid-template-columns: minmax(200px, 0.85fr) minmax(260px, 1.15fr) auto auto;
  align-items: center;
  gap: 16px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 16px 42px rgba(40, 33, 30, 0.12);
  backdrop-filter: blur(14px);
}

.eyebrow,
.drawer-kicker {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 850;
  text-transform: uppercase;
}

.course-panel h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.22rem;
  font-weight: 700;
  line-height: 1.1;
}

.course-panel p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.panel-cta,
.ghost-button {
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 16px;
  line-height: 1.15;
  text-align: center;
}

.panel-cta {
  min-width: 210px;
  background: var(--accent);
  color: white;
  font-weight: 830;
}

.ghost-button {
  min-width: 158px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
}

.ghost-button svg {
  width: 18px;
  height: 18px;
}

.menu-drawer,
.search-drawer {
  position: fixed;
  z-index: 70;
  top: var(--header-height);
  right: 0;
  bottom: 0;
  width: min(430px, 94vw);
  padding: 24px;
  overflow-y: auto;
  transform: translateX(104%);
  border-left: 1px solid var(--line);
  background: var(--panel);
  box-shadow: -18px 0 48px rgba(40, 33, 30, 0.18);
  transition: transform 180ms ease;
}

.search-drawer {
  right: auto;
  left: 0;
  transform: translateX(-104%);
  border-right: 1px solid var(--line);
  border-left: 0;
  box-shadow: 18px 0 48px rgba(40, 33, 30, 0.18);
}

.menu-drawer.is-open,
.search-drawer.is-open {
  transform: translateX(0);
}

.drawer-backdrop {
  position: fixed;
  z-index: 60;
  inset: var(--header-height) 0 0;
  visibility: hidden;
  border: 0;
  background: rgba(28, 25, 24, 0.24);
  opacity: 0;
  transition: opacity 180ms ease, visibility 180ms ease;
}

.drawer-backdrop.is-visible {
  visibility: visible;
  opacity: 1;
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.drawer-header h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.55rem;
}

.drawer-kicker {
  margin-bottom: 3px;
}

.menu-list,
.search-results {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.category-group {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfaff;
}

.category-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 12px 14px;
  list-style: none;
  cursor: pointer;
}

.category-group summary::-webkit-details-marker {
  display: none;
}

.category-group summary > span {
  display: grid;
  gap: 3px;
}

.category-group summary strong {
  font-size: 1.02rem;
}

.category-group summary small,
.category-page small,
.result-item small,
.result-item > span {
  color: var(--muted);
}

.category-group summary > svg {
  width: 19px;
  height: 19px;
  transition: transform 160ms ease;
}

.category-group[open] summary > svg {
  transform: rotate(180deg);
}

.category-pages {
  display: grid;
  border-top: 1px solid var(--line);
  background: white;
}

.category-page {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 14px;
  border: 0;
  border-bottom: 1px solid rgba(40, 33, 30, 0.08);
  background: white;
  color: var(--ink);
  text-align: left;
}

.category-page:last-child {
  border-bottom: 0;
}

.category-page > span:first-child {
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 850;
}

.category-page > span:nth-child(2) {
  display: grid;
  min-width: 0;
  gap: 2px;
}

.category-page strong,
.category-page small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.category-page > svg {
  width: 17px;
  height: 17px;
  opacity: 0.45;
}

.category-page:hover,
.category-page.is-current {
  background: rgba(91, 0, 230, 0.08);
}

.category-page.is-current {
  box-shadow: inset 3px 0 var(--accent);
}

.search-input {
  width: 100%;
  height: 46px;
  margin-top: 20px;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 7px;
  outline: 0;
  color: var(--ink);
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91, 0, 230, 0.12);
}

.result-item {
  display: grid;
  gap: 4px;
  width: 100%;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfaff;
  color: var(--ink);
  text-align: left;
}

.result-item:hover {
  border-color: var(--accent);
}

.result-item strong {
  font-weight: 800;
}

.empty-message {
  color: var(--muted);
}

.whatsapp-button {
  position: fixed;
  z-index: 80;
  right: 18px;
  bottom: 110px;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  background: #087f70;
  color: white;
  font-weight: 850;
  text-decoration: none;
  box-shadow: 0 14px 34px rgba(8, 127, 112, 0.28);
}

.whatsapp-button svg {
  width: 19px;
  height: 19px;
}

@media (max-width: 1120px) {
  .course-panel {
    right: 68px;
    left: 68px;
    grid-template-columns: minmax(180px, 0.8fr) minmax(220px, 1.2fr) auto;
  }

  .ghost-button {
    display: none;
  }
}

@media (max-width: 760px) {
  :root {
    --header-height: 56px;
  }

  .topbar {
    gap: 8px;
    padding-inline: 10px;
  }

  .brand-name,
  .hide-small,
  .cta-button {
    display: none;
  }

  .brand-logo-shell {
    flex-basis: 46px;
    width: 46px;
    height: 38px;
  }

  .brand-logo {
    width: 47px;
    height: 43px;
  }

  .top-actions {
    gap: 6px;
  }

  .icon-button {
    width: 39px;
    min-height: 38px;
  }

  .counter-button {
    width: 110px;
    flex-basis: 110px;
    min-height: 38px;
    padding-inline: 8px;
  }

  .catalog-shell {
    min-height: calc(100svh - var(--header-height));
    padding-bottom: 88px;
  }

  .reader-stage {
    min-height: 0;
    padding: 10px 8px 16px;
  }

  .book-wrap {
    width: min(calc(100vw - 16px), calc(70.4545vh - 57.7727px));
    width: min(calc(100vw - 16px), calc((100svh - 82px) * 0.704545));
    height: min(calc(141.935vw - 22.7097px), calc(100vh - 82px));
    height: min(calc((100vw - 16px) * 1.4193548), calc(100svh - 82px));
    aspect-ratio: 620 / 880;
  }

  .course-panel {
    position: static;
    display: block;
    margin: 0 10px;
    padding: 18px;
  }

  .course-panel h1 {
    font-size: 1.55rem;
  }

  .course-panel .panel-description {
    margin-top: 8px;
  }

  .panel-cta,
  .ghost-button {
    display: flex;
    width: 100%;
    margin-top: 14px;
  }

  .side-nav {
    top: 50%;
    width: 40px;
    height: 56px;
    background: rgba(255, 255, 255, 0.86);
  }

  .side-nav svg {
    width: 22px;
    height: 22px;
  }

  .side-nav-left {
    left: 3px;
  }

  .side-nav-right {
    right: 3px;
  }

  .hotspot-icon {
    width: 38px;
    height: 38px;
    flex-basis: 38px;
  }

  .hotspot-label {
    display: none;
  }

  .menu-drawer,
  .search-drawer {
    width: 100vw;
    padding: 20px 16px 92px;
  }

  .drawer-backdrop {
    display: none;
  }

  .whatsapp-button {
    right: 12px;
    bottom: 12px;
    width: 46px;
    min-height: 44px;
    padding: 0;
  }

  .whatsapp-button span {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

.page-hotspot { border: 0; padding: 0; background: transparent; cursor: pointer; -webkit-tap-highlight-color: transparent; }
.hotspot-tooltip {
  position: fixed; z-index: 1000; width: max-content;
  max-width: min(280px, calc(100vw - 16px)); padding: 10px 14px;
  border-radius: 6px; background: #24232a; color: #fff;
  font-size: 14px; line-height: 1.4; overflow-wrap: anywhere; pointer-events: none;
}
.hotspot-tooltip[hidden] { display: none; }
.modal-open { overflow: hidden; }
.enrollment-dialog {
  width: min(600px, calc(100vw - 24px)); max-height: calc(100vh - 24px); max-height: calc(100dvh - 24px);
  margin: auto; padding: 28px; border: 1px solid #dddbe2;
  border-radius: 8px; background: #fff; color: #24232a; overflow: auto;
  box-shadow: 0 16px 70px #0004;
}
.enrollment-dialog::backdrop { background: #17151baa; }
.enrollment-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.enrollment-eyebrow { margin: 0 0 6px; font-size: 13px; font-weight: 600; color: var(--muted); }
.enrollment-header h2 { margin: 0; font-size: 28px; line-height: 1.2; }
.enrollment-header button { flex: 0 0 44px; }
.enrollment-options { display: grid; gap: 12px; }
.enrollment-option { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 10px 16px; padding: 18px; border: 1px solid #e1dfe6; border-radius: 8px; }
.enrollment-plan { min-width: 0; overflow-wrap: anywhere; }
.enrollment-option h3 { margin: 0 0 8px; font-size: 14px; font-weight: 600; color: #55505e; }
.enrollment-price { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px; margin: 0; font-size: 32px; font-weight: 750; line-height: 1.2; }
.enrollment-price span { font-size: 14px; font-weight: 400; color: #55505e; }
.enrollment-detail { margin: 7px 0 0; font-size: 13px; line-height: 1.5; color: #55505e; white-space: pre-line; }
.enrollment-link { display: inline-flex; justify-content: center; align-items: center; gap: 6px; min-height: 44px; padding: 11px 14px; border: 1px solid #918a9f; border-radius: 6px; background: white; color: #352b48; font-size: 14px; font-weight: 600; text-decoration: none; white-space: nowrap; }
.enrollment-link svg { width: 16px; height: 16px; flex-shrink: 0; }
.enrollment-link:hover { border-color: var(--accent); background: #f5f2fc; }
.enrollment-link:focus-visible { outline: 3px solid #087f70; outline-offset: 3px; }
.enrollment-link:disabled { cursor: not-allowed; opacity: .75; }
.enrollment-option.is-featured { border: 2px solid var(--accent); padding: 17px; background: #f7f4ff; }
.is-featured .enrollment-link { background: var(--accent); border-color: var(--accent); color: white; }
.is-featured .enrollment-link:hover { filter: brightness(.92); }
.enrollment-badge { grid-column: 1 / -1; display: inline-flex; align-items: center; gap: 5px; justify-self: start; padding: 4px 8px; border-radius: 4px; background: #e3f3ed; color: #126347; font-size: 12px; font-weight: 700; }
.enrollment-badge svg { width: 14px; height: 14px; }
.video-player { width: min(100cqw, 177.777cqh); max-height: 100%; aspect-ratio: 16 / 9; background: #17151b; }
.video-pending { display: grid; place-content: center; justify-items: center; gap: 8px; color: #e8e6ec; font-size: 12px; }
.drive-player { position: relative; display: grid; place-items: center; }
.drive-start { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; border: 1px solid #fffa; background: #fff; color: #24232a; cursor: pointer; }
.drive-start[hidden] { display: none; }
.drive-player iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
@media (max-width: 420px) {
  .enrollment-dialog { padding: 16px; }
  .enrollment-header { gap: 8px; margin-bottom: 20px; }
  .enrollment-header h2 { font-size: 24px; }
  .enrollment-option { padding: 14px 10px; gap: 8px; }
  .enrollment-option.is-featured { padding: 13px 9px; }
  .enrollment-link { padding: 10px 8px; font-size: 13px; gap: 4px; }
  .enrollment-price { font-size: 28px; }
  .enrollment-price span { font-size: 12px; }
  .enrollment-detail { font-size: 12px; }
}