/**
 * Course Catalog Styles
 * Consistently using the portal design system.
 */

/* ============================================================
   MODULE DETAIL PAGE (student-facing)
   The /courses/<slug>/m/<module_slug>/ page. Reuses the lesson
   row visual language from the public course detail page so the
   focused-work experience feels consistent with the rest of the
   course.
   ============================================================ */
.module-detail-page {
  padding-top: var(--space-3, 12px);
}

.module-hero {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: var(--space-5, 20px);
  align-items: center;
  background: var(--color-surface, #fff);
  border: 1px solid var(--color-border-subtle, #e2e8f0);
  border-radius: var(--radius-xl, 18px);
  padding: var(--space-5, 20px);
  box-shadow: var(--shadow-xs, 0 1px 2px rgba(0, 0, 0, 0.03));
  margin-bottom: var(--space-3, 12px);
}
@media (max-width: 720px) {
  .module-hero {
    grid-template-columns: auto 1fr;
  }
  .module-hero__actions {
    grid-column: 1 / -1;
  }
}
.module-hero__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-accent-subtle, rgba(99, 102, 241, 0.12));
  color: var(--color-accent, #6366f1);
  font-size: 24px;
  font-weight: 700;
  flex-shrink: 0;
}
.module-hero__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2, 8px);
  min-width: 0;
}
.module-hero__eyebrow {
  font-size: var(--font-size-xs, 12px);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent, #6366f1);
}
.module-hero__title {
  margin: 0;
  font-size: clamp(1.5rem, 1.5vw + 1rem, 2rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text, #0c1222);
  word-wrap: break-word;
}
.module-hero__summary {
  margin: 0;
  color: var(--color-text-muted, #64748b);
  font-size: var(--font-size-base, 16px);
  line-height: 1.5;
}
.module-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3, 12px) var(--space-4, 16px);
  padding-top: var(--space-2, 8px);
  border-top: 1px solid var(--color-border-subtle, #e2e8f0);
  margin-top: var(--space-2, 8px);
}
.module-hero__stat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-sm, 14px);
  color: var(--color-text-muted, #64748b);
}
.module-hero__stat svg {
  width: 16px;
  height: 16px;
  color: var(--color-accent, #6366f1);
  flex-shrink: 0;
}
.module-hero__stat strong {
  color: var(--color-text, #0c1222);
  font-weight: 600;
}
.module-hero__stat--progress strong {
  color: var(--color-success, #16a34a);
}
.module-hero__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-2, 8px);
  align-items: flex-end;
}
.module-hero__back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: var(--color-surface, #fff);
  color: var(--color-accent, #6366f1);
  border: 1px solid var(--color-border-subtle, #e2e8f0);
  border-radius: var(--radius-md, 10px);
  font-weight: 600;
  font-size: var(--font-size-sm, 14px);
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--easing-smooth),
    border-color var(--duration-fast) var(--easing-smooth);
}
.module-hero__back:hover {
  background: var(--color-accent-subtle, rgba(99, 102, 241, 0.12));
  border-color: var(--color-accent, #6366f1);
  color: var(--color-accent, #6366f1);
}

/* Purchase card (for non-enrolled users with locked lessons) */
.module-purchase-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-3, 12px);
  align-items: center;
  background: color-mix(in srgb, var(--color-warning, #f59e0b) 8%, var(--color-surface, #fff));
  border: 1px solid color-mix(in srgb, var(--color-warning, #f59e0b) 30%, var(--color-border-subtle, #e2e8f0));
  border-radius: var(--radius-lg, 14px);
  padding: var(--space-3, 12px) var(--space-4, 16px);
  margin-bottom: var(--space-3, 12px);
}
@media (max-width: 720px) {
  .module-purchase-card {
    grid-template-columns: 1fr;
  }
}
.module-purchase-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--color-warning, #f59e0b) 18%, transparent);
  color: var(--color-warning-text, #92400e);
  flex-shrink: 0;
}
.module-purchase-card__body strong {
  display: block;
  color: var(--color-text, #0c1222);
  font-size: var(--font-size-sm, 14px);
  font-weight: 600;
}
.module-purchase-card__body span {
  color: var(--color-text-muted, #64748b);
  font-size: var(--font-size-xs, 12px);
  line-height: 1.4;
}
.module-purchase-card__cta {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  background: linear-gradient(135deg, var(--color-accent, #6366f1) 0%, var(--color-accent-strong, #4f46e5) 100%);
  color: var(--color-text-on-accent, #fff);
  border-radius: var(--radius-md, 10px);
  font-weight: 600;
  font-size: var(--font-size-sm, 14px);
  text-decoration: none;
  white-space: nowrap;
}

/* Curriculum: section cards */
.module-curriculum {
  display: flex;
  flex-direction: column;
  gap: var(--space-3, 12px);
}
.course-section-card {
  background: var(--color-surface, #fff);
  border: 1px solid var(--color-border-subtle, #e2e8f0);
  border-radius: var(--radius-xl, 18px);
  padding: var(--space-5, 20px);
  box-shadow: var(--shadow-xs, 0 1px 2px rgba(0, 0, 0, 0.03));
}
.course-section-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3, 12px);
  flex-wrap: wrap;
  margin-bottom: var(--space-2, 8px);
}
.course-section-card__head h3 {
  margin: 0;
  font-size: var(--font-size-lg, 18px);
  font-weight: 700;
  color: var(--color-text, #0c1222);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2, 8px);
  flex-wrap: wrap;
}
.course-section-card__num {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background: var(--color-bg-subtle, #f1f5f9);
  color: var(--color-text-muted, #64748b);
  border-radius: var(--radius-sm, 6px);
  font-size: var(--font-size-xs, 12px);
  font-weight: 700;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.04em;
}
.course-section-card__count {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: var(--color-bg-subtle, #f1f5f9);
  color: var(--color-text-muted, #64748b);
  border-radius: var(--radius-full, 9999px);
  font-size: var(--font-size-xs, 12px);
  font-weight: 600;
}
.course-section-card__summary {
  margin: 0 0 var(--space-3, 12px);
  color: var(--color-text-muted, #64748b);
  font-size: var(--font-size-sm, 14px);
  line-height: 1.5;
}
.course-section-card__lessons {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1, 4px);
}
.course-section-card__empty {
  padding: var(--space-3, 12px);
  color: var(--color-text-muted, #94a3b8);
  font-size: var(--font-size-sm, 14px);
  text-align: center;
}

/* Lesson row (clickable card) */
.course-lesson-row {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: var(--space-3, 12px);
  align-items: center;
  padding: var(--space-3, 12px);
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-md, 10px);
  transition: background-color var(--duration-fast) var(--easing-smooth),
    transform var(--duration-fast) var(--easing-smooth);
}
a.course-lesson-row:hover {
  background: var(--color-bg-subtle, #f1f5f9);
  transform: translateX(2px);
}
.course-lesson-row__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-accent-subtle, rgba(99, 102, 241, 0.12));
  color: var(--color-accent, #6366f1);
  flex-shrink: 0;
}
.course-lesson-row__icon svg {
  width: 18px;
  height: 18px;
}
.course-lesson-row__icon--preview {
  background: color-mix(in srgb, var(--color-success, #22c55e) 12%, transparent);
  color: var(--color-success, #16a34a);
}
.course-lesson-row__icon--locked {
  background: var(--color-bg-subtle, #f1f5f9);
  color: var(--color-text-muted, #94a3b8);
}
.course-lesson-row__main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.course-lesson-row__title {
  font-weight: 500;
  color: var(--color-text, #0c1222);
  font-size: var(--font-size-sm, 14px);
  line-height: 1.4;
  word-wrap: break-word;
}
a.course-lesson-row:hover .course-lesson-row__title {
  color: var(--color-accent, #6366f1);
}
.course-lesson-row__meta {
  font-size: var(--font-size-xs, 12px);
  color: var(--color-text-muted, #94a3b8);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}
.course-lesson-row__sep {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-text-muted, #cbd5e1);
  display: inline-block;
}
.course-lesson-row__duration {
  font-size: var(--font-size-xs, 12px);
  color: var(--color-text-muted, #94a3b8);
  white-space: nowrap;
  font-weight: 500;
}
.course-lesson-row__chev {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  color: var(--color-text-muted, #cbd5e1);
  flex-shrink: 0;
}
.course-lesson-row__chev svg {
  width: 18px;
  height: 18px;
}
.course-lesson-row__check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-success, #22c55e);
  color: white;
  flex-shrink: 0;
}
.course-lesson-row__check svg {
  width: 14px;
  height: 14px;
}
.course-lesson-row--locked {
  cursor: not-allowed;
  opacity: 0.6;
  pointer-events: none;
}

.module-empty {
  text-align: center;
  padding: var(--space-6, 24px);
  background: var(--color-surface, #fff);
  border: 1px dashed var(--color-border-subtle, #e2e8f0);
  border-radius: var(--radius-xl, 18px);
  color: var(--color-text-muted, #94a3b8);
}

@media (max-width: 640px) {
  .module-hero {
    padding: var(--space-4, 16px);
  }
  .module-hero__num {
    width: 48px;
    height: 48px;
    font-size: 20px;
  }
  .module-hero__title {
    font-size: 1.5rem;
  }
  .module-hero__actions {
    align-items: stretch;
    width: 100%;
  }
  .module-hero__back {
    width: 100%;
    justify-content: center;
  }
  .course-section-card {
    padding: var(--space-4, 16px);
  }
  .course-lesson-row {
    grid-template-columns: auto 1fr auto;
    padding: var(--space-2, 8px);
  }
  .course-lesson-row__duration {
    display: none;
  }
}


.course-catalog-page {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  min-height: auto;
  background: transparent;
  width: min(100%, 1280px);
  margin: 0 auto;
}

.course-catalog-page .courses-section {
  background: transparent;
  padding: 0;
}

/* Keep the catalog content flush with the sidebar instead of double-centering */
.course-catalog-page .courses-catalog-wrapper {
  width: 100%;
  max-width: none;
  margin: 0;
}

.course-catalog-page .courses-page-header-main {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.course-catalog-page .courses-page-header-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background: var(--accent-subtle);
  color: var(--accent);
  flex-shrink: 0;
}

.course-catalog-page .courses-page-header-icon svg {
  width: 28px;
  height: 28px;
}

.course-catalog-page .courses-catalog-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.course-catalog-page .courses-catalog-group-spaced {
  margin-bottom: 64px;
}

.course-catalog-page .courses-page-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.course-catalog-page .courses-page-header .material-icons-outlined {
  font-size: 48px;
  color: var(--accent);
}

.course-catalog-page .courses-page-header h1 {
  margin: 0;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.course-catalog-page .courses-page-header p {
  margin: var(--space-1) 0 0 0;
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 72ch;
}

.course-catalog-page .courses-section-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 0 0 var(--space-1);
  letter-spacing: -0.01em;
  color: var(--text);
  display: block;
  padding: 0;
  border: 0;
}

.course-catalog-page .courses-section-subtitle {
  color: var(--muted);
  margin-bottom: var(--space-5);
  font-size: 1rem;
}

.course-catalog-page .courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-6);
  max-width: none;
  margin: 0;
  width: 100%;
}

.course-catalog-page .course-card {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.course-catalog-page .course-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.course-catalog-page .course-card-header {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg);
}

.course-catalog-page .course-card-image {
  width: 100%;
  height: 100%;
}

.course-catalog-page .course-card-cover {
  width: 100%;
  height: 100%;
}

.course-catalog-page .course-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-catalog-page .course-card-cover-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent-subtle) 0%, var(--bg) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.course-catalog-page .course-card-body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  flex: 1;
}

.course-catalog-page .course-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
}

.course-catalog-page .course-subtitle {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: var(--space-1);
  line-clamp: 2;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-catalog-page .course-meta {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--space-2);
}

/* Softened treatment for empty catalogs — reads as a state, not a count. */
.course-catalog-page .course-meta--empty {
  color: var(--muted);
  opacity: 0.85;
}

/* Progress Styles */
.course-catalog-page .progress-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.course-catalog-page .progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.course-catalog-page .progress-label {
  font-weight: 600;
  color: var(--muted);
}

.course-catalog-page .progress-percentage {
  font-weight: 700;
  color: var(--accent);
}

.course-catalog-page .progress-bar {
  height: 8px;
  background: var(--bg);
  border-radius: 999px;
  overflow: hidden;
}

.course-catalog-page .progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  border-radius: 999px;
  transition: width 0.5s ease;
}

.course-catalog-page .course-card-action {
  padding: var(--space-5);
  padding-top: 0;
}

.course-catalog-page .continue-learning-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: var(--text-on-accent);
  border-radius: var(--radius-md);
  font-weight: 700;
  text-decoration: none;
  transition: all 0.2s ease;
}

.course-catalog-page .continue-learning-btn:hover {
  background: var(--accent-strong);
  transform: scale(1.02);
}

.course-catalog-page .button-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.course-catalog-page .preview-btn,
.course-catalog-page .buy-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  border-radius: var(--radius-md);
  font-weight: 700;
  text-decoration: none;
  transition: all 0.2s ease;
}

.course-catalog-page .preview-btn {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border-subtle);
}

.course-catalog-page .preview-btn:hover {
  background: var(--surface);
  border-color: var(--border);
}

.course-catalog-page .buy-btn {
  background: var(--accent);
  color: var(--text-on-accent);
}

.course-catalog-page .buy-btn:hover {
  background: var(--accent-strong);
}

@media (max-width: 768px) {
  .course-catalog-page .courses-page-header {
    padding: var(--space-5);
  }
  .course-catalog-page .courses-page-header-main {
    flex-direction: column;
    text-align: center;
  }
  .course-catalog-page .courses-grid {
    grid-template-columns: 1fr;
  }
  .course-catalog-page {
    max-width: 100%;
  }
}

/* ============================================
   COURSE LEARN PAGE STYLES
   ============================================ */

.learn-container {
  padding: var(--space-6);
  max-width: var(--content-max-width);
  margin: 0;
}

@media (min-width: 992px) {
  /* Internal View: Flush to sidebar */
  .app-shell.has-sidebar .learn-container {
    padding-left: 0;
    padding-right: var(--space-6);
  }

  /* Internal Course Detail View: Flush to sidebar */
  .app-shell.has-sidebar .course-detail-container {
    padding-left: 0;
    padding-right: 0;
  }
  .app-shell.has-sidebar .course-detail-container > section {
    padding-left: 0 !important;
    padding-right: 0 !important;
  }
  .app-shell.has-sidebar
    .course-detail-container
    > section
    > .course-detail-shell {
    margin-left: 0 !important;
    padding-left: 0 !important;
    max-width: none !important;
    width: 100% !important;
  }
}

.course-detail-container {
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.course-detail-page {
  background: transparent;
  min-height: auto;
  width: min(100%, 1280px);
  margin: 0 auto;
}

.course-detail-shell {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.course-detail-block {
  width: 100%;
}

.course-detail-block--continue {
  margin-top: 0;
}

.course-detail-block--content {
  margin-top: 0;
}

.course-certificate-page {
  color: var(--text);
}

.course-certificate-card {
  color: var(--text);
}

.course-certificate-preview {
  color: var(--text);
}

.course-header {
  margin-bottom: var(--space-6);
}

.course-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-2);
}

.progress-display {
  font-size: 14px;
  color: var(--muted);
}

.continue-section {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
}

.continue-btn,
.module-btn,
.exam-btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  background: linear-gradient(
    135deg,
    var(--accent) 0%,
    var(--accent-strong) 100%
  );
  color: white;
  text-decoration: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all 0.2s ease;
}

.continue-btn:hover,
.module-btn:hover,
.exam-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.course-learn-page {
  width: 100%;
}

.course-learn-modules-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-6);
}

.course-learn-modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: var(--space-6);
  align-items: stretch;
}

.course-learn-grid-item {
  min-width: 0;
}

.course-learn-module-card {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.course-learn-module-header,
.course-learn-module-content {
  min-width: 0;
}

.course-learn-module-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  line-height: 1.35;
}

.course-learn-module-title:hover {
  color: var(--accent);
}

.course-learn-module-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.course-learn-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  background: var(--accent-contrast);
  color: var(--accent);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
}

.course-learn-module-summary {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.course-learn-module-footer {
  margin-top: auto;
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
}

.course-learn-module-progress {
  font-size: 13px;
  color: var(--muted);
}

@media (min-width: 1200px) {
  .course-learn-modules-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .course-learn-module-footer {
    align-items: stretch;
  }

  .course-learn-module-footer .module-btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .course-detail-page {
    max-width: 100%;
  }
}

/* ============================================================
   COURSE DETAIL — REDESIGNED LAYOUT
   Modern card-based composition for the public course detail page.
   Replaces the previous inline-styled ad-hoc layout.
   ============================================================ */

/* ----- Hero ----- */
.course-hero-card {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
@media (max-width: 880px) {
  .course-hero-card {
    grid-template-columns: 1fr;
  }
}
.course-hero__cover {
  position: relative;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background:
    radial-gradient(120% 80% at 0% 0%, color-mix(in srgb, var(--color-accent) 25%, transparent) 0%, transparent 60%),
    radial-gradient(120% 80% at 100% 100%, color-mix(in srgb, var(--color-accent-strong) 25%, transparent) 0%, transparent 60%),
    linear-gradient(135deg, var(--color-accent-subtle), var(--color-bg-subtle));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-on-accent);
}
.course-hero__cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.course-hero__cover-glyph {
  font-size: 64px;
  font-weight: 700;
  letter-spacing: -0.02em;
  opacity: 0.85;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}
.course-hero__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-width: 0;
}
.course-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  align-self: flex-start;
}
.course-hero__title {
  margin: 0;
  font-size: clamp(1.75rem, 2.5vw + 1rem, 2.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
  word-wrap: break-word;
}
.course-hero__subtitle {
  margin: 0;
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
}
.course-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-5);
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}
.course-hero__stat {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}
.course-hero__stat svg {
  width: 18px;
  height: 18px;
  color: var(--color-accent);
  flex-shrink: 0;
}
.course-hero__stat strong {
  color: var(--color-text);
  font-weight: 600;
  margin-right: 4px;
}
.course-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}
.course-hero__actions .button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px 22px;
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: transform var(--duration-fast) var(--easing-smooth),
    box-shadow var(--duration-fast) var(--easing-smooth),
    background-color var(--duration-fast) var(--easing-smooth);
}
.course-hero__actions .button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.course-hero__cta {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-strong) 100%);
  color: var(--color-text-on-accent);
  border: none;
}
.course-hero__cta:hover {
  background: linear-gradient(135deg, var(--color-accent-strong) 0%, var(--color-accent) 100%);
  color: var(--color-text-on-accent);
}
.course-hero__cta-soon {
  display: inline-flex;
  align-items: center;
  padding: 12px 22px;
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  border: 1px dashed var(--color-border-subtle);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-base);
}
.course-hero__secondary {
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
  background: transparent;
}
.course-hero__secondary:hover {
  background: var(--color-accent);
  color: var(--color-text-on-accent);
}
.course-hero__price {
  font-size: var(--font-size-xs);
  opacity: 0.85;
  font-weight: 500;
}

/* ----- Progress card (enrolled users) ----- */
.course-progress-card {
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--color-accent) 6%, var(--color-surface)) 0%,
    var(--color-surface) 100%);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-5) var(--space-6);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-5);
  align-items: center;
  box-shadow: var(--shadow-xs);
}
@media (max-width: 720px) {
  .course-progress-card {
    grid-template-columns: 1fr;
  }
}
.course-progress-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-width: 0;
}
.course-progress-card__label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.course-progress-card__bar {
  position: relative;
  width: 100%;
  height: 10px;
  background: var(--color-bg-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.course-progress-card__fill {
  position: absolute;
  inset: 0 auto 0 0;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-strong));
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--easing-in-out);
}
.course-progress-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}
.course-progress-card__meta strong {
  color: var(--color-text);
  font-weight: 600;
}
.course-progress-card__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-strong) 100%);
  color: var(--color-text-on-accent);
  padding: 12px 22px;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: transform var(--duration-fast) var(--easing-smooth),
    box-shadow var(--duration-fast) var(--easing-smooth);
}
.course-progress-card__cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--color-text-on-accent);
}

/* ----- Purchase banner (non-enrolled) ----- */
.course-purchase-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-4);
  align-items: center;
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--color-warning) 8%, var(--color-surface)) 0%,
    var(--color-surface) 100%);
  border: 1px solid color-mix(in srgb, var(--color-warning) 30%, var(--color-border-subtle));
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-5);
}
@media (max-width: 720px) {
  .course-purchase-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
}
.course-purchase-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--color-warning) 18%, transparent);
  color: var(--color-warning-text);
  flex-shrink: 0;
}
.course-purchase-card__body strong {
  display: block;
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: 2px;
}
.course-purchase-card__body span {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
}
.course-purchase-card__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-strong) 100%);
  color: var(--color-text-on-accent);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: transform var(--duration-fast) var(--easing-smooth),
    box-shadow var(--duration-fast) var(--easing-smooth);
}
.course-purchase-card__cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--color-text-on-accent);
}

/* ----- Curriculum section ----- */
.course-curriculum {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.course-curriculum__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  flex-wrap: wrap;
}
.course-curriculum__title {
  margin: 0;
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
}
.course-curriculum__sub {
  margin: 6px 0 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}
.course-curriculum__actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.course-curriculum__btn {
  padding: 8px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--easing-smooth),
    color var(--duration-fast) var(--easing-smooth),
    border-color var(--duration-fast) var(--easing-smooth);
}
.course-curriculum__btn:hover {
  background: var(--color-bg-subtle);
  color: var(--color-text);
}

/* ----- Module card ----- */
.course-module {
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  transition: border-color var(--duration-fast) var(--easing-smooth),
    box-shadow var(--duration-fast) var(--easing-smooth);
}
.course-module[open] {
  box-shadow: var(--shadow-sm);
}
.course-module__summary {
  list-style: none;
  cursor: pointer;
  padding: var(--space-4) var(--space-5);
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-4);
  align-items: center;
  transition: background-color var(--duration-fast) var(--easing-smooth);
}
.course-module__summary::-webkit-details-marker {
  display: none;
}
.course-module__summary:hover {
  background: var(--color-bg-subtle);
}
.course-module__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  font-weight: 700;
  font-size: var(--font-size-base);
  flex-shrink: 0;
}
.course-module__title {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.course-module__title strong {
  color: var(--color-text);
  font-size: var(--font-size-lg);
  font-weight: 600;
  line-height: 1.3;
  word-wrap: break-word;
}
.course-module__title small {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.course-module__title small .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-text-muted);
  opacity: 0.5;
  display: inline-block;
}
.course-module__chev {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  transition: transform var(--duration-fast) var(--easing-smooth),
    background-color var(--duration-fast) var(--easing-smooth);
  flex-shrink: 0;
}
.course-module[open] .course-module__chev {
  transform: rotate(180deg);
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}
.course-module__chev svg {
  width: 18px;
  height: 18px;
}
.course-module__body {
  padding: 0 var(--space-5) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.course-module__summary-text {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  margin: 0;
}
.course-module__progress {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}
.course-module__progress-bar {
  position: relative;
  flex: 1;
  height: 6px;
  background: var(--color-bg-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
  max-width: 240px;
}
.course-module__progress-fill {
  position: absolute;
  inset: 0 auto 0 0;
  background: linear-gradient(90deg, var(--color-success), color-mix(in srgb, var(--color-success) 70%, var(--color-accent)));
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--easing-in-out);
}

/* ----- Section inside module ----- */
.course-section {
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-4);
}
.course-section:first-child {
  border-top: none;
  padding-top: 0;
}
.course-section__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}
.course-section__title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
  word-wrap: break-word;
}
.course-section__count {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: 500;
  white-space: nowrap;
  background: var(--color-bg-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}
.course-section__summary {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  margin: 0 0 var(--space-3);
}

/* ----- Lesson row ----- */
.course-lesson {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3) var(--space-3);
  margin: 0 calc(-1 * var(--space-3));
  border-radius: var(--radius-md);
  text-decoration: none;
  color: inherit;
  transition: background-color var(--duration-fast) var(--easing-smooth),
    transform var(--duration-fast) var(--easing-smooth);
}
.course-lesson:hover {
  background: var(--color-bg-subtle);
  transform: translateX(2px);
}
.course-lesson__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  flex-shrink: 0;
}
.course-lesson__icon svg {
  width: 16px;
  height: 16px;
}
.course-lesson__icon--locked {
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
}
.course-lesson__icon--preview {
  background: color-mix(in srgb, var(--color-success) 12%, transparent);
  color: var(--color-success);
}
.course-lesson__main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.course-lesson__title {
  font-weight: 500;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: 1.4;
  word-wrap: break-word;
}
.course-lesson:hover .course-lesson__title {
  color: var(--color-accent);
}
.course-lesson__meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 500;
}
.course-lesson__meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-text-muted);
  opacity: 0.5;
  display: inline-block;
}
.course-lesson__duration {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  font-weight: 500;
}
.course-lesson__check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-success);
  color: white;
  flex-shrink: 0;
}
.course-lesson__check svg {
  width: 14px;
  height: 14px;
}

/* ----- Empty state ----- */
.course-empty {
  background: var(--color-surface);
  border: 1px dashed var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-12) var(--space-6);
  text-align: center;
  color: var(--color-text-muted);
}

/* ----- About section ----- */
.course-about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-xs);
}
.course-about-card--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: var(--space-6);
  align-items: start;
}
@media (max-width: 880px) {
  .course-about-card--split {
    grid-template-columns: 1fr;
  }
}
.course-about-card__body h3 {
  margin: 0 0 var(--space-3);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}
.course-about-card__text {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  white-space: pre-wrap;
  word-wrap: break-word;
}
.course-about-card__video {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #000;
  aspect-ratio: 16 / 9;
  position: relative;
}
.course-about-card--split .course-about-card__body h3 {
  margin-top: 0;
}
.course-about-card__video iframe,
.course-about-card__video video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.course-about-card__video-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: 14px;
  padding: var(--space-6);
  text-align: center;
}

/* ----- Curriculum chips ----- */
.course-curriculum__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}
.course-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--color-bg-subtle);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
}
.course-chip svg {
  width: 14px;
  height: 14px;
  color: var(--color-accent);
  flex-shrink: 0;
}

/* ----- Locked lesson modifier ----- */
.course-lesson--locked {
  cursor: not-allowed;
  opacity: 0.6;
  pointer-events: none;
}
.course-lesson--locked:hover {
  background: transparent;
  transform: none;
}
.course-lesson--locked .course-lesson__title {
  color: var(--color-text-muted);
}

/* ----- Mobile refinements ----- */
@media (max-width: 640px) {
  .course-hero-card {
    padding: var(--space-4);
  }
  .course-hero__title {
    font-size: 1.625rem;
  }
  .course-hero__actions .button {
    width: 100%;
    justify-content: center;
  }
  .course-module__summary {
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
  }
  .course-module__num {
    width: 32px;
    height: 32px;
    font-size: var(--font-size-sm);
  }
  .course-module__title strong {
    font-size: var(--font-size-base);
  }
  .course-module__title small {
    font-size: var(--font-size-xs);
  }
  .course-module__body {
    padding: 0 var(--space-4) var(--space-4);
  }
  .course-lesson {
    grid-template-columns: auto 1fr auto;
    padding: var(--space-2);
    margin: 0;
  }
  .course-lesson__duration {
    display: none;
  }
  .course-curriculum__head {
    flex-direction: column;
    align-items: stretch;
  }
  .course-curriculum__actions {
    justify-content: flex-end;
  }
  .course-curriculum__title {
    font-size: 1.375rem;
  }
}

/* ============================================================
   COURSE CATALOG TABS (student-facing)
   Three-way toggle on /courses/catalog/: Your Learning, Course
   Library, All.
   ============================================================ */
.courses-tabs {
  margin-bottom: var(--space-4);
}

/* Mobile: tabs should scroll horizontally on narrow screens
   rather than wrap or overflow. */
@media (max-width: 600px) {
  .courses-tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .courses-tabs::-webkit-scrollbar {
    display: none;
  }
  .courses-tabs .aim-tab {
    padding: 10px 14px;
    white-space: nowrap;
    font-size: 13px;
  }
}