.lesson-detail-section {
  padding: 3rem 0 6rem;
}

.lesson-detail-container {
  max-width: 1360px;
}

.lesson-detail-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.detail-back-link {
  display: inline-flex;
  margin-bottom: 1.25rem;
  color: var(--gold);
  font-size: var(--font-size-sm);
  font-weight: 700;
}

.lesson-title-row {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 2rem;
}

.lesson-title-row > div:first-child {
  max-width: 850px;
}

.lesson-title-row h1 {
  margin-bottom: 0.55rem;
  font-size: var(--font-size-4xl);
  font-weight: 900;
  line-height: 1.3;
}

.lesson-title-row p {
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: end;
  gap: 0.45rem;
  max-width: 360px;
}

.lesson-meta span {
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  font-weight: 700;
}

.lesson-detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 2rem;
  align-items: start;
}

.lesson-article {
  min-width: 0;
}

.lesson-content {
  font-size: var(--font-size-base);
  line-height: 1.85;
}

.lesson-content .lesson-section {
  margin-bottom: 1rem;
  padding: 1.35rem;
  border-radius: 8px;
  background: rgba(22, 27, 39, 0.78);
}

.lesson-content .lesson-section h2 {
  font-size: var(--font-size-xl);
  line-height: 1.4;
}

.lesson-content .lesson-section p {
  color: var(--text-secondary);
}

.lesson-content .lesson-section strong {
  color: var(--text-primary);
}

.lesson-content .lesson-tip,
.lesson-content .lesson-warning {
  border-radius: 6px;
}

.lesson-content .lesson-table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
}

.lesson-video-link {
  margin-top: 1rem;
}

.lesson-pagination {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.lesson-pagination a {
  display: grid;
  gap: 0.3rem;
  min-height: 90px;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(22, 27, 39, 0.65);
}

.lesson-pagination a:hover,
.lesson-pagination a:focus-visible {
  border-color: var(--gold-dark);
  outline: none;
}

.lesson-pagination small {
  color: var(--gold);
  font-weight: 700;
}

.lesson-pagination strong {
  line-height: 1.55;
}

.lesson-outline {
  position: sticky;
  top: 92px;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(22, 27, 39, 0.92);
}

.lesson-outline h2 {
  margin: 0.15rem 0 0.75rem;
  font-size: var(--font-size-xl);
}

.lesson-outline-list {
  display: grid;
  max-height: calc(100vh - 210px);
  overflow-y: auto;
  scrollbar-width: thin;
}

.lesson-outline-list a {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  gap: 0.65rem;
  align-items: center;
  min-height: 58px;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

.lesson-outline-list a:last-child {
  border-bottom: 0;
}

.lesson-outline-list a:hover,
.lesson-outline-list a.active {
  color: var(--text-primary);
}

.lesson-outline-list a.active strong,
.lesson-outline-list a.active > span {
  color: var(--gold);
}

.lesson-outline-list > a > span {
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: var(--font-size-xs);
  font-weight: 800;
}

.lesson-outline-list strong {
  font-size: var(--font-size-sm);
  line-height: 1.45;
}

.lesson-outline-list small {
  white-space: nowrap;
  color: var(--text-muted);
  font-size: 0.68rem;
}

@media (max-width: 1040px) {
  .lesson-detail-layout {
    grid-template-columns: 1fr;
  }

  .lesson-outline {
    position: static;
  }

  .lesson-outline-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-height: none;
    column-gap: 1rem;
  }
}

@media (max-width: 720px) {
  .lesson-detail-section {
    padding: 2.25rem 0 4rem;
  }

  .lesson-title-row {
    align-items: start;
    flex-direction: column;
  }

  .lesson-title-row h1 {
    font-size: var(--font-size-3xl);
  }

  .lesson-meta {
    justify-content: start;
  }

  .lesson-content .lesson-section {
    padding: 1rem;
  }

  .lesson-pagination,
  .lesson-outline-list {
    grid-template-columns: 1fr;
  }
}


/* LESSON_COMPLETE_BUTTON_YELLOW_START */
.lesson-complete-form {
    margin: 28px 0 !important;
    display: flex !important;
    justify-content: flex-start !important;
}

.lesson-complete-form button,
.lesson-complete-form .action-btn,
.lesson-complete-form .action-btn.success {
    background: linear-gradient(135deg, #f4d35e 0%, #d4af37 100%) !important;
    color: #111827 !important;
    border: 1px solid rgba(244, 211, 94, 0.95) !important;
    border-radius: 16px !important;
    padding: 14px 28px !important;
    font-size: 17px !important;
    font-weight: 900 !important;
    line-height: 1.3 !important;
    opacity: 1 !important;
    box-shadow: 0 10px 28px rgba(212, 175, 55, 0.28) !important;
    cursor: pointer !important;
    text-shadow: none !important;
}

.lesson-complete-form button:hover,
.lesson-complete-form .action-btn:hover {
    background: linear-gradient(135deg, #ffe27a 0%, #e1bd45 100%) !important;
    transform: translateY(-1px);
}

.lesson-complete-form button:disabled,
.lesson-complete-form .action-btn:disabled,
.lesson-complete-form .action-btn.success:disabled {
    background: linear-gradient(135deg, #f4d35e 0%, #d4af37 100%) !important;
    color: #111827 !important;
    opacity: 1 !important;
    cursor: not-allowed !important;
    filter: none !important;
}
/* LESSON_COMPLETE_BUTTON_YELLOW_END */


/* LESSON_COMPLETE_STATUS_UI_START */
.lesson-complete-form {
    margin: 28px 0 !important;
    display: flex !important;
    justify-content: flex-start !important;
}

.lesson-complete-btn {
    background: linear-gradient(135deg, #f4d35e 0%, #d4af37 100%) !important;
    color: #111827 !important;
    border: 1px solid rgba(244, 211, 94, 0.95) !important;
    border-radius: 16px !important;
    padding: 14px 28px !important;
    font-size: 17px !important;
    font-weight: 900 !important;
    line-height: 1.3 !important;
    opacity: 1 !important;
    box-shadow: 0 10px 28px rgba(212, 175, 55, 0.28) !important;
    cursor: pointer !important;
    text-shadow: none !important;
}

.lesson-complete-btn:hover {
    background: linear-gradient(135deg, #ffe27a 0%, #e1bd45 100%) !important;
    transform: translateY(-1px);
}

.lesson-complete-status {
    margin: 28px 0 !important;
    display: inline-flex !important;
    align-items: center !important;
    gap: 8px !important;
    background: rgba(22, 163, 74, 0.16) !important;
    color: #86efac !important;
    border: 1px solid rgba(34, 197, 94, 0.65) !important;
    border-radius: 16px !important;
    padding: 14px 22px !important;
    font-size: 17px !important;
    font-weight: 900 !important;
    box-shadow: 0 10px 28px rgba(22, 163, 74, 0.16) !important;
}
/* LESSON_COMPLETE_STATUS_UI_END */