/* Education Page Styles */

.education-main {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--spacing-4);
  min-height: calc(100vh - 60px);
  background-color: var(--color-bg-light);
}

/* Sidebar */
.education-sidebar {
  background-color: var(--color-bg-elevation-1);
  border-right: 1px solid var(--color-border);
  padding: var(--spacing-6);
  overflow-y: auto;
  max-height: calc(100vh - 60px);
  position: sticky;
  top: 60px;
}

/* Lessons Navigation */
.lessons-nav {
  margin-bottom: var(--spacing-12);
}

.lessons-nav__title {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-4);
  color: var(--color-primary);
  font-size: var(--text-lg);
}

.lessons-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.lessons-nav__link {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: var(--spacing-2);
  align-items: center;
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--border-radius);
  background: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  width: 100%;
  text-align: right;
  color: var(--color-text-primary);
  font-weight: var(--font-medium);
}

.lessons-nav__link:hover {
  background-color: var(--color-bg-light);
  color: var(--color-primary);
}

.lessons-nav__link.active {
  background-color: var(--color-primary);
  color: var(--color-text-white);
}

.lessons-nav__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background-color: rgba(0, 0, 0, 0.1);
  border-radius: var(--border-radius-full);
  font-weight: var(--font-bold);
  font-size: var(--text-sm);
}

.lessons-nav__link.active .lessons-nav__number {
  background-color: rgba(255, 255, 255, 0.3);
}

.lessons-nav__title-text {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Progress Indicator */
.education-sidebar__progress {
  padding: var(--spacing-4);
  background-color: var(--color-bg-light);
  border-radius: var(--border-radius);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-2);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
}

.progress-bar {
  width: 100%;
  height: 6px;
  background-color: var(--color-border);
  border-radius: var(--border-radius-full);
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background-color: var(--color-success);
  transition: width 0.3s ease-out;
  width: 0%;
}

/* Main Content Area */
.education-content {
  padding: var(--spacing-8);
  overflow-y: auto;
  max-height: calc(100vh - 60px);
}

/* Education Header */
.education-header {
  margin-bottom: var(--spacing-12);
}

.education-header__title {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-3);
}

.education-header__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* Lesson Content */
.lesson-container {
  background-color: var(--color-bg-elevation-1);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-8);
  margin-bottom: var(--spacing-8);
  min-height: 400px;
}

.lesson-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 400px;
  gap: var(--spacing-4);
  color: var(--color-text-secondary);
}

.lesson-placeholder i {
  font-size: 3rem;
  opacity: 0.5;
}

/* Lesson Content Elements */
.lesson-section {
  margin-bottom: var(--spacing-8);
}

.lesson-section h2 {
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: var(--spacing-3);
  margin-bottom: var(--spacing-4);
}

.lesson-section h3 {
  color: var(--color-text-primary);
  margin-top: var(--spacing-6);
  margin-bottom: var(--spacing-3);
}

.lesson-image {
  max-width: 100%;
  border-radius: var(--border-radius-lg);
  margin: var(--spacing-4) 0;
  box-shadow: var(--shadow-md);
}

.lesson-code {
  background-color: var(--color-bg-elevation-1-dark);
  color: var(--color-text-white);
  padding: var(--spacing-4);
  border-radius: var(--border-radius);
  overflow-x: auto;
  margin: var(--spacing-4) 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.lesson-equation {
  background-color: var(--color-bg-light);
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-4);
  margin: var(--spacing-4) 0;
  border-radius: var(--border-radius);
  font-style: italic;
  color: var(--color-text-primary);
}

.lesson-note {
  background-color: rgba(251, 191, 36, 0.1);
  border-left: 4px solid var(--color-warning);
  padding: var(--spacing-4);
  margin: var(--spacing-4) 0;
  border-radius: var(--border-radius);
  color: var(--color-text-primary);
}

.lesson-note strong {
  color: var(--color-warning);
}

.lesson-highlight {
  background-color: rgba(37, 99, 235, 0.1);
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--border-radius);
  color: var(--color-primary);
  font-weight: var(--font-semibold);
}

/* Canvas Animation */
.lesson-canvas-container {
  width: 100%;
  height: 400px;
  background-color: var(--color-bg-light);
  border-radius: var(--border-radius);
  margin: var(--spacing-4) 0;
  overflow: hidden;
}

.lesson-canvas-container canvas {
  width: 100%;
  height: 100%;
}

.canvas-controls {
  display: flex;
  gap: var(--spacing-2);
  margin-top: var(--spacing-4);
  flex-wrap: wrap;
}

.canvas-control-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

/* Lesson Navigation */
.lesson-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-4);
  padding: var(--spacing-6);
  background-color: var(--color-bg-elevation-1);
  border-radius: var(--border-radius-lg);
  margin-top: var(--spacing-8);
}

.lesson-nav__progress {
  font-weight: var(--font-semibold);
  color: var(--color-text-secondary);
}

.lesson-navigation .btn {
  flex: 0 1 auto;
}

.lesson-navigation .btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Responsive */
@media (max-width: 1024px) {
  .education-main {
    grid-template-columns: 200px 1fr;
  }

  .education-sidebar {
    padding: var(--spacing-4);
  }

  .education-content {
    padding: var(--spacing-6);
  }
}

@media (max-width: 768px) {
  .education-main {
    grid-template-columns: 1fr;
  }

  .education-sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    max-height: 50vh;
    overflow-x: auto;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-4);
    z-index: 1000;
  }

  .education-sidebar.hidden {
    display: none;
  }

  .education-content {
    padding: var(--spacing-4);
    margin-top: 250px;
  }

  .lesson-container {
    padding: var(--spacing-4);
  }

  .lesson-navigation {
    flex-direction: column;
  }

  .lesson-navigation .btn {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .education-header__title {
    font-size: var(--text-2xl);
  }

  .lesson-container {
    min-height: 300px;
  }

  .lesson-image {
    max-height: 300px;
    object-fit: cover;
  }
}

/* Lesson Content Styles */
.lesson-section {
  margin-bottom: var(--spacing-8);
  padding: var(--spacing-4);
  border-radius: var(--border-radius);
  background-color: var(--color-bg-elevation-1);
  border-left: 3px solid var(--color-primary);
}

.lesson-section h3 {
  color: var(--color-primary);
  font-size: var(--text-xl);
  margin-bottom: var(--spacing-4);
  margin-top: 0;
}

.lesson-section h4 {
  color: var(--color-text-primary);
  font-size: var(--text-lg);
  margin-bottom: var(--spacing-3);
  margin-top: var(--spacing-4);
}

.lesson-section p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-3);
  line-height: 1.6;
}

.lesson-section ul,
.lesson-section ol {
  margin-left: var(--spacing-6);
  margin-bottom: var(--spacing-4);
}

.lesson-section li {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2);
  line-height: 1.6;
}

.lesson-section code {
  background-color: var(--color-bg-light);
  color: var(--color-danger);
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--border-radius);
  font-family: 'Courier New', monospace;
  font-size: var(--text-sm);
  display: block;
  margin: var(--spacing-4) 0;
  overflow-x: auto;
}

.lesson-section table {
  width: 100%;
  margin: var(--spacing-4) 0;
  border-collapse: collapse;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.lesson-section table th {
  background-color: var(--color-primary);
  color: var(--color-text-white);
  padding: var(--spacing-3);
  text-align: right;
  font-weight: var(--font-bold);
}

.lesson-section table td {
  padding: var(--spacing-3);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.lesson-section table tr:last-child td {
  border-bottom: none;
}