.lessons-main-section {
  padding: 4rem 0 6rem;
}

.lessons-container {
  max-width: 1320px;
}

.lessons-heading {
  max-width: 820px;
  margin-inline: auto;
}

.lessons-heading h1 {
  margin-bottom: 0.75rem;
  font-size: var(--font-size-4xl);
  font-weight: 900;
  line-height: 1.25;
}

.learning-filter {
  position: sticky;
  top: 82px;
  z-index: 20;
  width: fit-content;
  max-width: 100%;
  margin: 0 auto 3.5rem;
  padding: 0.35rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(13, 17, 23, 0.94);
  backdrop-filter: blur(12px);
}

.learning-filter .filter-btn {
  min-height: 42px;
  border: 0;
  border-radius: 6px;
}

.learning-filter .filter-btn.active {
  background: var(--gold);
  color: #111318;
}

.learning-tracks {
  display: grid;
  gap: 4.5rem;
}

.learning-track[hidden] {
  display: none;
}

.learning-track {
  --track-accent: var(--gold);
}

.learning-track[data-course-track="beginner"] {
  --track-accent: #46c98b;
}

.learning-track[data-course-track="intermediate"] {
  --track-accent: #e2b84f;
}

.learning-track[data-course-track="advanced"] {
  --track-accent: #ef6a73;
}

.track-heading {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 1.25rem;
  align-items: start;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.track-number {
  display: grid;
  width: 64px;
  height: 56px;
  place-items: center;
  border-inline-start: 4px solid var(--track-accent);
  color: var(--track-accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: var(--font-size-xl);
  font-weight: 800;
}

.track-title-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.track-title-row h2 {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  line-height: 1.3;
}

.track-count {
  padding: 0.15rem 0.6rem;
  border: 1px solid color-mix(in srgb, var(--track-accent) 45%, transparent);
  border-radius: 6px;
  color: var(--track-accent);
  font-size: var(--font-size-xs);
  font-weight: 700;
}

.track-heading p {
  max-width: 820px;
  margin-top: 0.35rem;
  color: var(--text-secondary);
}

.track-lessons-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.track-lesson-card {
  min-height: 275px;
  border-radius: 8px;
  border-top: 3px solid var(--track-accent);
  background: rgba(22, 27, 39, 0.9);
  box-shadow: none;
}

.track-lesson-card:hover,
.track-lesson-card:focus-visible {
  border-color: var(--track-accent);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.26);
  outline: none;
}

.lesson-card-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  min-height: 50px;
  padding: 1rem 1.25rem 0;
  color: var(--text-muted);
  font-size: var(--font-size-xs);
  font-weight: 700;
}

.lesson-step {
  color: var(--track-accent);
}

.lesson-category {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.track-lesson-card .cc-body {
  padding: 1rem 1.25rem 1.25rem;
}

.track-lesson-card .cc-body h3 {
  min-height: 3.2em;
  margin-bottom: 0.65rem;
  font-size: var(--font-size-lg);
  line-height: 1.55;
}

.track-lesson-card .cc-body p {
  line-height: 1.75;
}

.track-lesson-card .cc-footer {
  gap: 0.75rem;
  min-height: 54px;
  padding: 0.8rem 1.25rem;
}

.lesson-card-action {
  color: var(--track-accent);
  font-size: var(--font-size-xs);
  font-weight: 800;
}

@media (max-width: 1050px) {
  .track-lessons-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .lessons-main-section {
    padding: 2.75rem 0 4rem;
  }

  .lessons-heading h1 {
    font-size: var(--font-size-3xl);
  }

  .learning-filter {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
    margin-bottom: 2.75rem;
  }

  .learning-filter .filter-btn {
    width: 100%;
    padding-inline: 0.5rem;
  }

  .learning-tracks {
    gap: 3.25rem;
  }

  .track-heading {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 0.85rem;
  }

  .track-number {
    width: 48px;
    height: 48px;
    font-size: var(--font-size-base);
  }

  .track-title-row h2 {
    font-size: var(--font-size-xl);
  }

  .track-lessons-grid {
    grid-template-columns: 1fr;
  }

  .track-lesson-card {
    min-height: 245px;
  }
}