/* Navegação por capítulos aplicada às aulas do EstudaMath. */
.lesson-folder {
  min-width: 0;
  list-style: none;
  border-radius: 9px;
}

.lesson-folder + .lesson-folder {
  margin-top: 2px;
}

.lesson-folder-button {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 8px 9px 10px;
  color: #17233d;
  font: 800 .86rem/1.3 Inter, system-ui, sans-serif;
  text-align: left;
  background: #fff;
  border: 0;
  border-radius: 9px;
  cursor: pointer;
  transition: color .2s ease, background-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.lesson-folder-button:hover,
.lesson-folder-button:focus-visible {
  color: var(--lesson-blue);
  background: #f3f8ff;
  transform: translateX(2px);
}

.lesson-folder-button[aria-current="step"] {
  color: var(--lesson-blue);
  background: var(--lesson-blue-soft);
  box-shadow: inset 3px 0 0 var(--lesson-blue);
}

.lesson-folder-button:focus-visible {
  outline: 3px solid rgba(7, 94, 230, .22);
  outline-offset: 2px;
}

.lesson-folder-label {
  min-width: 0;
  overflow-wrap: anywhere;
}

.lesson-folder-number {
  display: inline-grid;
  width: 22px;
  height: 22px;
  margin-right: 7px;
  place-items: center;
  color: var(--lesson-blue);
  font-size: .72rem;
  background: #e8f2ff;
  border: 1px solid rgba(7, 94, 230, .08);
  border-radius: 6px;
  transition: background-color .2s ease, color .2s ease;
}

.lesson-folder-button[aria-current="step"] .lesson-folder-number {
  color: #fff;
  background: var(--lesson-blue);
}

.lesson-folder-caret {
  position: relative;
  display: block;
  flex: 0 0 22px;
  width: 22px;
  height: 22px;
  color: #53647f;
  font-size: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
  transition: color .22s ease, transform .22s ease;
}

.lesson-folder-caret::before,
.lesson-folder-caret::after {
  content: "";
  position: absolute;
  top: 10px;
  width: 7px;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
  transition: transform .28s cubic-bezier(.2, .72, .25, 1);
}

.lesson-folder-caret::before {
  left: 4px;
  transform: rotate(42deg);
}

.lesson-folder-caret::after {
  right: 4px;
  transform: rotate(-42deg);
}

.lesson-folder-button[aria-expanded="true"] .lesson-folder-caret {
  color: var(--lesson-blue);
}

.lesson-folder-button[aria-expanded="true"] .lesson-folder-caret::before {
  transform: rotate(-42deg);
}

.lesson-folder-button[aria-expanded="true"] .lesson-folder-caret::after {
  transform: rotate(42deg);
}

.lesson-folder-button:hover .lesson-folder-caret {
  transform: translateY(1px);
}

/* No desktop, o menu acompanha a leitura sem criar rolagem própria. */
@media (min-width: 1041px) {
  .lesson-chapters-enabled .lesson-clean-model .lesson-anchor-nav .lesson-anchor-card {
    position: sticky !important;
    top: 88px !important;
    max-height: none !important;
    overflow: visible !important;
  }

  .lesson-chapters-enabled .lesson-clean-model .lesson-anchor-nav .lesson-anchor-card.lesson-sidebar-fixed {
    position: fixed !important;
    top: 88px !important;
    left: var(--lesson-sidebar-fixed-left) !important;
    z-index: 6;
    width: var(--lesson-sidebar-fixed-width) !important;
    max-height: calc(100vh - 108px) !important;
    padding-right: 6px;
    overflow-y: auto !important;
    background: #fff;
  }
}

.lesson-folder-links {
  display: grid;
  gap: 1px;
  margin: 4px 0 9px 11px;
  padding: 3px 0 3px 10px;
  border-left: 1px solid #d7e4f5;
}

.lesson-folder-links .lesson-anchor-link {
  padding-left: 11px;
  font-size: .82rem;
  border-radius: 6px;
  transition: color .18s ease, background-color .18s ease, transform .18s ease;
}

.lesson-folder-links .lesson-anchor-link:hover,
.lesson-folder-links .lesson-anchor-link:focus-visible {
  transform: translateX(2px);
}

.lesson-chapters-enabled .lesson-folder-links {
  max-height: 0;
  margin-top: 0;
  margin-bottom: 0;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
  overflow: hidden;
  visibility: hidden;
  transform: translateY(-5px);
  transition:
    max-height .32s cubic-bezier(.2, .72, .25, 1),
    opacity .2s ease,
    transform .28s cubic-bezier(.2, .72, .25, 1),
    margin .28s ease,
    padding .28s ease,
    visibility 0s linear .32s;
}

.lesson-chapters-enabled .lesson-folder.is-open .lesson-folder-links {
  max-height: var(--lesson-folder-height, 520px);
  margin: 4px 0 9px 11px;
  padding: 3px 0 3px 10px;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition-delay: 0s;
}

.lesson-chapters-enabled .study-card[hidden],
.lesson-chapters-enabled .studio-bottom-nav[hidden],
.lesson-chapters-enabled .lesson-chapter-nav [hidden] {
  display: none !important;
}

.lesson-chapters-enabled .study-card:not([hidden]) {
  animation: lesson-chapter-reveal .24s ease both;
}

@keyframes lesson-chapter-reveal {
  from { opacity: .72; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.lesson-chapter-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 64px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--lesson-line);
}

.lesson-chapter-heading span {
  color: #65738c;
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: .055em;
  text-transform: uppercase;
}

.lesson-chapter-heading strong {
  color: var(--lesson-ink);
  font-size: clamp(1rem, 1.7vw, 1.2rem);
  text-align: right;
}

.lesson-chapters-enabled .study-card h2::before {
  content: attr(data-lesson-number) ". ";
}

.lesson-chapters-enabled .study-card.lesson-chapter-first {
  padding-top: 30px;
}

.lesson-chapters-enabled .study-card.lesson-chapter-last {
  border-bottom: 0;
}

.lesson-chapter-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--lesson-line);
}

.lesson-chapter-nav button {
  min-height: 42px;
  padding: 0 15px;
  color: var(--lesson-blue);
  font: 800 .82rem/1 Inter, system-ui, sans-serif;
  background: #fff;
  border: 1px solid #c9d8ed;
  border-radius: 7px;
  cursor: pointer;
}

.lesson-chapter-nav button:last-child {
  margin-left: auto;
  color: #fff;
  background: var(--lesson-blue);
  border-color: var(--lesson-blue);
}

.lesson-chapter-nav button:hover {
  border-color: var(--lesson-blue);
}

.lesson-chapter-nav button:focus-visible {
  outline: 3px solid rgba(7, 94, 230, .24);
  outline-offset: 2px;
}

@media (max-width: 1040px) {
  .lesson-folder-button {
    min-height: 48px;
    padding: 10px 8px 10px 12px;
    font-size: .9rem;
  }

  .lesson-folder-caret {
    flex-basis: 24px;
    width: 24px;
    height: 24px;
  }

  .lesson-folder-caret::before,
  .lesson-folder-caret::after {
    top: 11px;
  }

  .lesson-folder-links .lesson-anchor-link {
    min-height: 42px;
    display: flex;
    align-items: center;
  }
}

@media (max-width: 760px) {
  .lesson-chapter-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
    padding: 14px 2px;
  }

  .lesson-chapter-heading strong {
    text-align: left;
  }

  .lesson-chapter-nav {
    align-items: stretch;
    flex-direction: column;
  }

  .lesson-chapter-nav button,
  .lesson-chapter-nav button:last-child {
    width: 100%;
    min-height: 46px;
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .lesson-folder-button,
  .lesson-folder-number,
  .lesson-folder-caret,
  .lesson-folder-caret::before,
  .lesson-folder-caret::after,
  .lesson-folder-links,
  .lesson-folder-links .lesson-anchor-link {
    transition: none !important;
  }

  .lesson-chapters-enabled .study-card:not([hidden]) {
    animation: none;
  }
}