/* ══════════════════════════════════════════
   LESSON PAGES — shared styles
   ══════════════════════════════════════════ */

/* Top bar */
.les-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  background: var(--white);
  border-bottom: 3px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
}

.les-back {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--gray-400);
  text-decoration: none;
  transition: color 0.2s ease;
}

.les-back:hover {
  color: var(--gray-900);
  text-decoration: none;
}

.les-topbar-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gray-900);
}

.les-topbar-track {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-dark);
  background: var(--accent-light);
  padding: 4px 12px;
  border-radius: 12px;
}

/* Hero */
.les-hero {
  padding: 48px 40px 40px;
  color: #fff;
  position: relative;
}

.les-hero-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.les-hero-num {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: rgba(255,255,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}

.les-hero h1 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 0 0 6px;
  color: #fff;
}

.les-hero p {
  font-size: 0.92rem;
  color: rgba(255,255,255,0.7);
  margin: 0;
}

/* Content */
.les-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 36px 40px 48px;
}

.les-section {
  margin-bottom: 36px;
}

.les-section:last-child {
  margin-bottom: 0;
}

.les-section h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--gray-900);
}

.les-section p {
  font-size: 1rem;
  color: var(--gray-700);
  line-height: 1.8;
}

.les-section ul {
  padding-left: 20px;
  margin: 8px 0 0;
}

.les-section li {
  font-size: 1rem;
  color: var(--gray-700);
  line-height: 1.8;
  margin-bottom: 4px;
}

/* Placeholder styling for barebone content */
.les-placeholder {
  background: var(--gray-100);
  border: 2px dashed var(--gray-200);
  border-radius: var(--radius);
  padding: 24px;
}

.les-placeholder p {
  font-style: italic;
  color: var(--gray-400);
  margin-bottom: 8px;
}

.les-placeholder ul {
  margin-top: 0;
}

.les-placeholder li {
  color: var(--gray-400);
}

/* Track-specific sections — hidden by default, shown via JS */
.les-section--student,
.les-section--resident {
  display: none;
}

.les-section--student.visible,
.les-section--resident.visible {
  display: block;
}

/* Navigation */
.les-nav {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 40px 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--gray-200);
  padding-top: 24px;
}

/* ── Intro section ── */
.les-intro p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--gray-700);
}

.les-intro li {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--gray-800);
}

/* ── Case scenario card ── */
.les-case {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius);
  padding: 28px;
  margin: 20px 0;
}

.les-case--blue { border-left-color: var(--accent-dark); }
.les-case--rose { border-left-color: var(--rose); }
.les-case--amber { border-left-color: var(--amber); }

.les-case-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.les-case-label--navy { color: var(--primary); }
.les-case-label--blue { color: var(--accent-dark); }
.les-case-label--rose { color: var(--rose); }
.les-case-label--amber { color: #92400E; }

.les-case p {
  font-size: 0.92rem;
  color: var(--gray-700);
  line-height: 1.7;
  margin-bottom: 10px;
}

.les-case p:last-child { margin-bottom: 0; }

/* ── Teaching point ── */
.les-teaching {
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-top: 16px;
}

.les-teaching-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-dark);
  margin-bottom: 6px;
}

.les-teaching p {
  font-size: 0.92rem;
  color: var(--gray-700);
  line-height: 1.6;
  margin: 0;
}

/* ── Reference citation card ── */
.les-reference {
  background: var(--offwhite);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 20px 0;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.les-reference-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.les-reference-body {
  flex: 1;
  min-width: 0;
}

.les-reference-body cite {
  display: block;
  font-size: 0.85rem;
  font-style: normal;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 4px;
  line-height: 1.4;
}

.les-reference-body .les-reference-journal {
  font-size: 0.78rem;
  color: var(--gray-400);
  font-style: italic;
}

.les-reference-body a {
  font-size: 0.78rem;
  font-weight: 600;
}

/* ── Case image (wide breakout figure with caption) ── */
.les-case-image {
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  width: min(1200px, 100vw - 40px);
  margin: 20px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  background: #000;
}

.les-case-image img {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 520px;
  margin: 0 auto;
  object-fit: contain;
  background: #000;
  cursor: zoom-in;
}

.les-case-image-caption {
  background: var(--white);
  padding: 10px 16px;
  font-size: 0.78rem;
  color: var(--gray-500);
  line-height: 1.5;
  border-top: 1px solid var(--gray-200);
}

.les-case-image-caption a {
  font-weight: 600;
}

/* ── Lightbox overlay ── */
.les-lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.les-lightbox.visible { opacity: 1; }

.les-lightbox img {
  max-width: 95vw;
  max-height: 95vh;
  object-fit: contain;
  transform-origin: center center;
  transition: transform 0.2s ease;
  cursor: grab;
}

.les-lightbox img.zoomed {
  max-width: none;
  max-height: none;
  cursor: grab;
}

.les-lightbox img.dragging { cursor: grabbing; }

.les-lightbox-close {
  position: absolute;
  top: 16px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.15);
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease;
  font-family: var(--heading);
  line-height: 1;
}

.les-lightbox-close:hover { background: rgba(255,255,255,0.3); }

.les-lightbox-hint {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.72rem;
  color: rgba(255,255,255,0.5);
  pointer-events: none;
}

@media (max-width: 768px) {
  .les-case-image {
    width: calc(100% + 40px);
    left: -20px;
    transform: none;
  }
}

/* ── Formal definition card ── */
.les-definition {
  background: var(--offwhite);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 20px 0;
}

.les-definition-label {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-400);
  margin-bottom: 8px;
}

.les-definition p {
  font-size: 0.92rem;
  color: var(--gray-800);
  line-height: 1.6;
  margin: 0 0 10px;
}

.les-definition ul {
  margin: 0;
  padding-left: 18px;
}

.les-definition li {
  font-size: 0.92rem;
  color: var(--gray-800);
  line-height: 1.6;
  margin-bottom: 4px;
}

/* ══════════════════════════════════════════
   SLIDESHOW
   ══════════════════════════════════════════ */
.slideshow {
  margin: 20px 0;
  display: flex;
  align-items: center;
  gap: 0;
}

.slideshow:focus { outline: 2px solid var(--accent); outline-offset: 2px; }

.slideshow-viewport {
  position: relative;
  background: var(--gray-100);
  min-height: 280px;
  flex: 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-200);
}

.slideshow-slide {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  transition: opacity 0.25s ease;
}

.slideshow-fade-out { opacity: 0; }
.slideshow-fade-in { opacity: 1; }

.slideshow-slide img {
  max-width: 100%;
  max-height: 420px;
  display: block;
  margin: 0 auto;
}

.slideshow-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 32px;
  color: var(--gray-400);
  text-align: center;
  width: 100%;
}

.slideshow-placeholder-icon {
  font-size: 2.5rem;
  opacity: 0.35;
  margin-bottom: 10px;
}

.slideshow-placeholder-text {
  font-size: 0.88rem;
  max-width: 320px;
  line-height: 1.5;
}

.slideshow-top-right {
  position: absolute;
  top: 12px;
  right: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 2;
}

.slideshow-counter {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--gray-400);
  background: rgba(255,255,255,0.85);
  padding: 3px 10px;
  border-radius: 10px;
}

.slideshow-download {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: rgba(255,255,255,0.85);
  color: var(--gray-500);
  transition: all 0.15s ease;
  text-decoration: none;
}

.slideshow-download:hover {
  background: #fff;
  color: var(--accent-dark);
  text-decoration: none;
}

.slideshow-arrow {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--gray-200);
  background: var(--white);
  color: var(--gray-900);
  font-size: 1.4rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  font-family: var(--heading);
  line-height: 1;
  flex-shrink: 0;
}

.slideshow-arrow:hover { background: var(--gray-100); border-color: var(--gray-300); }
.slideshow-arrow:disabled { opacity: 0.25; cursor: default; }
.slideshow-arrow:disabled:hover { background: var(--white); border-color: var(--gray-200); }
.slideshow-arrow--prev { margin-right: 12px; }
.slideshow-arrow--next { margin-left: 12px; }

/* ── Wide slideshow — full-bleed from 720px content column ── */
.slideshow-wide {
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  width: min(1200px, 100vw - 40px);
}

.slideshow-wide .slideshow-viewport {
  min-height: 500px;
}

.slideshow-wide .slideshow-slide {
  min-height: 500px;
}

.slideshow-wide .slideshow-slide img {
  max-height: none;
  width: 100%;
}

.slideshow-wide .slideshow-arrow {
  width: 48px;
  height: 48px;
  font-size: 1.8rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  color: var(--gray-900);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.slideshow-wide .slideshow-arrow:hover { background: var(--gray-100); }
.slideshow-wide .slideshow-arrow--prev { margin-right: 16px; }
.slideshow-wide .slideshow-arrow--next { margin-left: 16px; }

.slideshow-wide .slideshow-counter {
  font-size: 0.78rem;
  padding: 4px 14px;
  background: rgba(0,0,0,0.5);
  color: #fff;
}

.slideshow-wide .slideshow-download {
  background: rgba(0,0,0,0.5);
  color: #fff;
}

.slideshow-wide .slideshow-download:hover {
  background: rgba(0,0,0,0.7);
  color: #fff;
}

@media (max-width: 768px) {
  .slideshow-wide .slideshow-viewport { min-height: 240px; }
  .slideshow-wide .slideshow-slide { min-height: 240px; }
  .slideshow-wide .slideshow-arrow { width: 36px; height: 36px; font-size: 1.3rem; }
  .slideshow-wide .slideshow-arrow--prev { margin-right: 8px; }
  .slideshow-wide .slideshow-arrow--next { margin-left: 8px; }
}

/* ── Video cards (link to YouTube) ── */
.les-video-card {
  display: block;
  text-decoration: none;
  margin: 20px 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  background: var(--gray-100);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.les-video-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(14, 165, 233, 0.12);
  text-decoration: none;
}

.les-video-thumb {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  background: #0B1D3A;
  overflow: hidden;
}

.les-video-thumb img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.les-video-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  background: rgba(0, 0, 0, 0.7);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, transform 0.2s ease;
}

.les-video-card:hover .les-video-play {
  background: rgba(255, 0, 0, 0.85);
  transform: translate(-50%, -50%) scale(1.08);
}

.les-video-play-arrow {
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 12px 0 12px 22px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}

.les-video-info {
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: #fff;
}

.les-video-yt-icon {
  width: 28px;
  height: 20px;
  background: #FF0000;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.les-video-yt-icon::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 5px 0 5px 9px;
  border-color: transparent transparent transparent #fff;
  margin-left: 2px;
}

.les-video-info span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-900);
}

.les-video-info small {
  font-size: 0.72rem;
  color: var(--gray-400);
  margin-left: auto;
  white-space: nowrap;
}

/* ══════════════════════════════════════════
   WORKFLOW DIAGRAM (lessons 4 & 5)
   ══════════════════════════════════════════ */
.wf-diagram {
  background: #fff;
  border-radius: 14px;
  border: 1px solid var(--gray-200);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
  margin-bottom: 32px;
}

.wf-diagram-intro {
  padding: 20px 24px 0;
}

.wf-diagram-intro p {
  font-size: 0.85rem;
  color: var(--gray-500);
  line-height: 1.6;
  margin: 0 0 16px;
}

.wf-top-label {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-400);
  padding: 0 24px;
  margin-bottom: 12px;
}

.wf-chevrons {
  display: flex;
  gap: 0;
  padding: 0 24px 0;
}

.wf-chev {
  flex: 1;
  cursor: pointer;
  min-width: 0;
}

.wf-chev-shape {
  padding: 10px 6px 8px 18px;
  min-height: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 50%, calc(100% - 12px) 100%, 0 100%, 12px 50%);
  transition: all 0.2s ease;
}

.wf-chev:first-child .wf-chev-shape {
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 50%, calc(100% - 12px) 100%, 0 100%);
  border-radius: 8px 0 0 8px;
  padding-left: 12px;
}

.wf-chev:last-child .wf-chev-shape {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%, 12px 50%);
  border-radius: 0 8px 8px 0;
}

.wf-chev:nth-child(1) .wf-chev-shape { background: #D1E8D5; }
.wf-chev:nth-child(2) .wf-chev-shape { background: #D1E5F7; }
.wf-chev:nth-child(3) .wf-chev-shape { background: #DBE9F2; }
.wf-chev:nth-child(4) .wf-chev-shape { background: #C9DFF5; }
.wf-chev:nth-child(5) .wf-chev-shape { background: #D8D0F0; }
.wf-chev:nth-child(6) .wf-chev-shape { background: #C9DFF5; }
.wf-chev:nth-child(7) .wf-chev-shape { background: #D1E8D5; }

.wf-chev:hover .wf-chev-shape { filter: brightness(0.92); }
.wf-chev.active .wf-chev-shape { filter: brightness(0.82); box-shadow: inset 0 0 0 2px rgba(0,0,0,0.08); }

.wf-chev-num {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(255,255,255,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  font-weight: 800;
  color: var(--gray-900);
}

.wf-chev-name {
  font-size: 0.56rem;
  font-weight: 600;
  color: var(--gray-900);
  text-align: center;
  line-height: 1.15;
}

.wf-body {
  display: grid;
  grid-template-columns: 240px 1fr;
  border-top: 1px solid var(--gray-200);
  min-height: 340px;
}

.wf-left {
  border-right: 1px solid var(--gray-200);
  padding: 12px 0;
  overflow-y: auto;
}

.wf-acc-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  cursor: pointer;
  transition: all 0.15s ease;
  border-left: 3px solid transparent;
}

.wf-acc-header:hover { background: #F8FBFF; }
.wf-acc-header.active { background: #EBF5FF; border-left-color: var(--accent); }

.wf-acc-header-num {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.62rem;
  font-weight: 800;
  color: var(--gray-600);
  flex-shrink: 0;
}

.wf-acc-header.active .wf-acc-header-num {
  background: var(--accent-light);
  color: var(--accent-dark);
}

.wf-acc-header-name {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--gray-900);
  flex: 1;
}

.wf-acc-header.active .wf-acc-header-name { color: var(--accent-dark); }

.wf-acc-arrow {
  font-size: 0.55rem;
  color: var(--gray-300);
  transition: transform 0.2s ease;
}

.wf-acc-header.expanded .wf-acc-arrow {
  transform: rotate(90deg);
  color: #7C3AED;
}

.wf-acc-children {
  display: none;
}

.wf-acc-children.visible { display: block; }

.wf-acc-child {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px 6px 34px;
  cursor: pointer;
  transition: all 0.15s ease;
  border-left: 3px solid transparent;
}

.wf-acc-child::before {
  content: '';
  width: 12px;
  height: 1px;
  background: var(--gray-200);
  flex-shrink: 0;
}

.wf-acc-child:hover { background: #FAF5FF; }
.wf-acc-child.active { background: #F3EDFF; border-left-color: #7C3AED; }

.wf-acc-child-name {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--gray-600);
}

.wf-acc-child.active .wf-acc-child-name { color: #7C3AED; font-weight: 600; }

.wf-right {
  overflow-y: auto;
}

.wf-detail-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 340px;
  text-align: center;
  padding: 32px;
}

.wf-detail-empty-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--gray-300);
}

.wf-detail-empty h4 {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--gray-400);
  margin: 0 0 4px;
}

.wf-detail-empty p {
  font-size: 0.75rem;
  color: var(--gray-300);
  margin: 0;
}

.wf-detail-content {
  padding: 24px;
  animation: wfFadeIn 0.25s ease;
}

@keyframes wfFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.wf-detail-content h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 0 0 8px;
}

.wf-detail-content p {
  font-size: 0.85rem;
  color: var(--gray-600);
  line-height: 1.65;
  margin: 0 0 16px;
}

.wf-example {
  background: var(--gray-100);
  border-radius: 10px;
  padding: 14px 18px;
  border-left: 3px solid var(--accent);
}

.wf-example-label {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-dark);
  margin-bottom: 4px;
}

.wf-example p {
  font-size: 0.8rem;
  color: var(--gray-500);
  margin: 0;
  line-height: 1.6;
}

.wf-example a { font-weight: 600; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .les-topbar { padding: 12px 16px; }
  .les-hero { padding: 32px 20px; }
  .les-hero-inner { flex-direction: column; gap: 12px; }
  .les-content { padding: 24px 20px 36px; }
  .les-nav { padding: 0 20px 40px; padding-top: 20px; flex-direction: column; gap: 12px; }
  .les-nav .btn { width: 100%; text-align: center; }
  .wf-body { grid-template-columns: 1fr; }
  .wf-left { border-right: none; border-bottom: 1px solid var(--gray-200); }
  .wf-chevrons { flex-wrap: wrap; gap: 4px; }
  .wf-chev-shape { clip-path: none !important; border-radius: 8px; padding: 8px 6px; }
  .les-topbar { flex-wrap: wrap; gap: 8px; }
}

/* ══════════════════════════════════════════
   CHECKPOINT QUIZ
   ══════════════════════════════════════════ */
#ckpt-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px solid var(--gray-200);
}

.ckpt-section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.ckpt-section-header h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 0;
}

.ckpt-lock-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #A8492C;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.ckpt-section-desc {
  font-size: 0.88rem;
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: 24px;
}

.ckpt-question {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
}

.ckpt-q-num {
  font-size: 0.72rem;
  font-weight: 700;
  color: #A8492C;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.ckpt-q-text {
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 16px;
  font-size: 0.92rem;
  line-height: 1.6;
}

.ckpt-q-text code {
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: 'Courier New', monospace;
  font-size: 0.85em;
  color: #A8492C;
}

.ckpt-input {
  display: block;
  width: 100%;
  max-width: 320px;
  padding: 10px 14px;
  font-size: 0.88rem;
  font-family: var(--heading);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  background: var(--white);
  color: var(--gray-900);
  transition: border-color 0.2s ease;
}

.ckpt-input:focus {
  outline: none;
  border-color: #A8492C;
}

.ckpt-input--correct {
  border-color: var(--mint-dark);
  background: var(--mint-light);
  color: var(--mint-dark);
}

.ckpt-input--incorrect {
  border-color: var(--rose);
  background: var(--rose-light);
  color: var(--rose);
}

.ckpt-correction {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--mint-dark);
  margin-top: 6px;
}

.ckpt-submit-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
}

#ckpt-submit-btn {
  padding: 12px 28px;
  background: #A8492C;
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: var(--heading);
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s ease;
}

#ckpt-submit-btn:hover:not(:disabled) {
  background: #8A3B23;
}

#ckpt-submit-btn:disabled {
  background: var(--gray-200);
  color: var(--gray-400);
  cursor: not-allowed;
}

#ckpt-submit-hint {
  font-size: 0.82rem;
  color: var(--gray-400);
}

#ckpt-results {
  display: none;
  background: #FBF3EF;
  border: 1px solid #F6E6DF;
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 24px 0;
  text-align: center;
}

#ckpt-results .quiz-score {
  color: #A8492C;
}

#ckpt-pass-msg {
  display: none;
  font-size: 0.88rem;
  color: var(--gray-600);
  margin-top: 12px;
  line-height: 1.6;
}

#ckpt-retry-section {
  display: none;
  margin-top: 12px;
}

#ckpt-retry-btn {
  padding: 10px 24px;
  background: var(--white);
  border: 2px solid #A8492C;
  color: #A8492C;
  border-radius: var(--radius);
  font-family: var(--heading);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

#ckpt-retry-btn:hover {
  background: #FBF3EF;
}

/* Locked Next button for research pages */
.ckpt-next-locked {
  opacity: 0.4;
  pointer-events: none;
  position: relative;
}

.ckpt-next-enabled {
  opacity: 1;
  pointer-events: auto;
}

/* Guiding question shown above the lesson title */
.les-hero-q {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(255,255,255,0.65);
  margin: 0 0 4px;
}