/* Focused reading layout for the algebra and geometry pilot lessons. */
body.lesson-pilot .article-wrapper {
  padding-bottom: 64px;
}

body.lesson-pilot .article-container {
  max-width: 920px;
}

body.lesson-pilot .article-body {
  max-width: 70ch;
  margin-inline: auto;
}

body.lesson-pilot .article-body section[id],
body.lesson-pilot #lesson-summary,
body.lesson-pilot #section-faq {
  scroll-margin-top: 112px;
}

body.lesson-pilot .article-body h2,
body.lesson-pilot .lesson-summary h2 {
  text-wrap: balance;
  line-height: 1.3;
}

body.lesson-pilot .lesson-summary {
  margin: 2rem 0;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  border-radius: 12px;
  background: var(--bg-surface-soft);
  color: var(--text-secondary);
}

body.lesson-pilot .lesson-summary h2 {
  margin-top: 0;
}

body.lesson-pilot .lesson-summary ul {
  display: grid;
  gap: 10px;
  padding-left: 1.35rem;
  line-height: 1.7;
}

body.lesson-pilot .lesson-self-check {
  margin-top: 20px;
  padding: 16px;
  border-radius: 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
}

body.lesson-pilot .lesson-self-check h3 {
  margin: 0 0 8px;
}

body.lesson-pilot .lesson-self-check p {
  line-height: 1.7;
}

body.lesson-pilot .lesson-self-check details {
  margin-top: 12px;
}

body.lesson-pilot .lesson-self-check summary {
  min-height: 44px;
  display: flex;
  align-items: center;
  cursor: pointer;
  font-weight: 700;
  color: var(--primary);
}

@media (max-width: 640px) {
  body.lesson-pilot > header > div:first-child {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr);
    align-items: stretch !important;
    gap: 8px !important;
    padding: 8px 12px 10px !important;
  }

  body.lesson-pilot > header > div:first-child > a {
    width: calc(100% - 52px) !important;
    min-width: 0;
    min-height: 32px;
    margin-left: 52px !important;
    gap: 8px !important;
    align-items: center;
    overflow: hidden;
  }

  body.lesson-pilot > header > div:first-child > div:last-child {
    width: calc(100% - 52px);
    min-width: 0;
    min-height: 44px;
    margin-left: 52px !important;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px !important;
  }

  body.lesson-pilot > header > div:first-child > div:last-child .btn {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  body.lesson-pilot .article-wrapper {
    padding: 0 0 40px;
  }

  body.lesson-pilot .article-container {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 18px 14px 48px;
    border-left: 0;
    border-right: 0;
    border-radius: 0;
    box-shadow: none;
  }

  body.lesson-pilot .article-header {
    margin-bottom: 18px;
    padding-bottom: 16px;
  }

  body.lesson-pilot .article-breadcrumb {
    display: flex;
    flex-wrap: nowrap;
    gap: 6px;
    max-width: 100%;
    margin-bottom: 12px;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    white-space: nowrap;
    scrollbar-width: thin;
    font-size: 0.76rem;
  }

  body.lesson-pilot .article-breadcrumb > * {
    flex: 0 0 auto;
  }

  body.lesson-pilot .article-title-h1 {
    max-width: 24ch;
    margin-bottom: 12px;
    font-size: clamp(1.55rem, 7vw, 2rem);
    line-height: 1.22;
    letter-spacing: -0.02em;
    overflow-wrap: anywhere;
    text-wrap: balance;
  }

  body.lesson-pilot .article-meta-bar {
    gap: 6px;
    margin-top: 10px;
  }

  body.lesson-pilot .article-meta-bar .meta-tag-pill.amber,
  body.lesson-pilot .article-meta-bar .meta-item:last-child {
    display: none;
  }

  body.lesson-pilot .article-hero-banner {
    min-height: 0;
    margin-bottom: 16px;
    padding: 14px 14px 12px;
    border-radius: 12px;
  }

  body.lesson-pilot .hero-label {
    max-width: 100%;
    font-size: 0.78rem;
    line-height: 1.4;
  }

  body.lesson-pilot .hero-title {
    margin: 8px 0 10px;
    font-size: 1.25rem;
    line-height: 1.3;
    text-wrap: balance;
  }

  body.lesson-pilot .hero-badges {
    gap: 6px;
    margin: 8px 0;
  }

  body.lesson-pilot .hero-badge {
    padding: 4px 8px;
    font-size: 0.74rem;
    line-height: 1.35;
  }

  body.lesson-pilot .hero-badge:nth-child(n+4) {
    display: none;
  }

  body.lesson-pilot .share-buttons-bar {
    gap: 8px;
    padding: 0;
    margin-bottom: 16px;
  }

  body.lesson-pilot .share-buttons-bar .share-btn {
    width: 100%;
    min-height: 44px;
    justify-content: center;
    padding: 8px 10px;
    font-size: 0.8rem;
  }

  body.lesson-pilot .warmup-box {
    margin-bottom: 18px;
    padding: 16px 14px;
    text-align: left;
  }

  body.lesson-pilot .warmup-box svg {
    max-height: 170px;
    object-fit: contain;
  }

  body.lesson-pilot .warmup-box .warmup-options {
    align-items: stretch;
  }

  body.lesson-pilot .warmup-box .warmup-opt {
    min-width: 44px;
    min-height: 44px;
  }

  body.lesson-pilot .article-body {
    max-width: none;
    font-size: 1rem;
    line-height: 1.7;
  }

  body.lesson-pilot .article-body h2,
  body.lesson-pilot .lesson-summary h2 {
    font-size: 1.2rem;
    line-height: 1.32;
    overflow-wrap: anywhere;
  }

  body.lesson-pilot .article-body h3,
  body.lesson-pilot .lesson-summary h3 {
    font-size: 1.04rem;
    line-height: 1.4;
    overflow-wrap: anywhere;
  }

  body.lesson-pilot .lesson-outcomes {
    padding: 16px !important;
    margin-bottom: 20px !important;
  }

  body.lesson-pilot .lesson-outcomes ul {
    padding-left: 1.25rem;
  }

  body.lesson-pilot .article-body button,
  body.lesson-pilot .article-body .visual-btn,
  body.lesson-pilot .article-body .hint-btn,
  body.lesson-pilot .article-body .quiz-option,
  body.lesson-pilot .article-body .tf-radio-label,
  body.lesson-pilot .mobile-toc-drawer .toc-drawer-close {
    min-width: 44px;
    min-height: 44px;
  }

  body.lesson-pilot .visual-canvas-stage {
    height: auto !important;
    aspect-ratio: 800 / 380;
  }

  body.lesson-pilot .visual-canvas-stage canvas {
    width: 100% !important;
    height: auto !important;
    aspect-ratio: 800 / 380;
    object-fit: contain;
  }

  body.lesson-pilot .visual-hint-overlay {
    width: calc(100% - 16px);
    max-width: 360px;
    padding: 6px 8px;
    border-radius: 8px;
    font-size: 0.7rem;
    line-height: 1.35;
    text-align: center;
  }

  body.lesson-pilot--geometry #threejs-canvas-wrapper {
    height: clamp(240px, 78vw, 340px) !important;
    touch-action: pan-y pinch-zoom !important;
  }

  body.lesson-pilot .lesson-summary {
    margin: 1.5rem 0;
    padding: 16px;
  }

  body.lesson-pilot .lesson-self-check {
    padding: 14px;
  }

  body.lesson-pilot #section-faq {
    margin-top: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  body.lesson-pilot *,
  body.lesson-pilot *::before,
  body.lesson-pilot *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}