/* ============================================
   COURSE DETAIL PAGE STYLES
   ============================================ */

/* Course Hero */
.course-hero {
  position: relative;
  padding: calc(var(--space-32) + 56px) 0 var(--space-12);
  overflow: hidden;
}

.course-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.course-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.course-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    var(--bg-primary) 0%,
    rgba(2, 6, 23, 0.8) 50%,
    var(--bg-primary) 100%
  );
}

.course-hero__content {
  max-width: var(--max-width-4xl);
}

.course-hero__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.course-hero__breadcrumb a {
  color: var(--color-primary-400);
}

.course-hero__breadcrumb a:hover {
  text-decoration: underline;
}

.course-hero .badge {
  margin-bottom: var(--space-4);
}

.course-hero__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-4);
}

.course-hero__description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
  max-width: var(--max-width-3xl);
}

.course-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.course-hero__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.course-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.course-hero__progress {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-subtle);
}

.course-hero__progress-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.course-hero__progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-accent-400));
  border-radius: var(--radius-full);
  transition: width var(--duration-500) var(--ease-out);
}

.course-hero__progress-text {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* Course Layout */
.course-main {
  padding: var(--space-12) 0 var(--space-24);
}

.course-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 1024px) {
  .course-layout {
    grid-template-columns: 1fr 380px;
  }
}

/* Course Tabs */
.course-tabs {
  display: flex;
  gap: var(--space-1);
  padding: var(--space-1);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-8);
}

.course-tab {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  background: transparent;
  border-radius: var(--radius-lg);
  transition: all var(--duration-200) var(--ease-out);
}

.course-tab:hover {
  color: var(--text-primary);
}

.course-tab.is-active {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

/* Tab Panels */
.course-tab-panel {
  display: none;
}

.course-tab-panel.is-active {
  display: block;
  animation: fadeIn var(--duration-300) var(--ease-out);
}

/* Course Sections */
.course-section {
  margin-bottom: var(--space-10);
}

.course-section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-4);
}

/* Learning Outcomes */
.learning-outcomes {
  display: grid;
  gap: var(--space-3);
}

.learning-outcomes li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.learning-outcomes li svg {
  flex-shrink: 0;
  margin-top: 2px;
}

/* Prerequisites */
.prerequisites {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.prerequisites li {
  position: relative;
  padding-left: var(--space-6);
  color: var(--text-secondary);
}

.prerequisites li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--color-primary-500);
  border-radius: 50%;
}

/* Prose */
.prose {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.prose p {
  margin-bottom: var(--space-4);
}

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

/* Curriculum */
.curriculum {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.curriculum-unit {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: border-color var(--duration-200) var(--ease-out);
}

.curriculum-unit:hover {
  border-color: var(--border-default);
}

.curriculum-unit__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  width: 100%;
  padding: var(--space-5);
  text-align: left;
  cursor: pointer;
}

.curriculum-unit__info {
  flex: 1;
}

.curriculum-unit__number {
  display: block;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-primary-400);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  margin-bottom: var(--space-1);
}

.curriculum-unit__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-1);
}

.curriculum-unit__meta {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.curriculum-unit__status {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.curriculum-unit__chevron {
  color: var(--text-tertiary);
  transition: transform var(--duration-200) var(--ease-out);
}

.curriculum-unit.is-expanded .curriculum-unit__chevron {
  transform: rotate(180deg);
}

.curriculum-unit__content {
  border-top: 1px solid var(--border-subtle);
}

.curriculum-unit__content[hidden] {
  display: none;
}

/* Curriculum Lessons */
.curriculum-lessons {
  padding: var(--space-2);
}

.curriculum-lesson {
  border-radius: var(--radius-lg);
  transition: background var(--duration-200) var(--ease-out);
}

.curriculum-lesson a,
.curriculum-lesson > span:first-child {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
}

.curriculum-lesson a {
  color: inherit;
}

.curriculum-lesson:hover {
  background: var(--bg-tertiary);
}

.curriculum-lesson__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  flex-shrink: 0;
}

.curriculum-lesson:hover .curriculum-lesson__icon {
  background: var(--color-primary-500);
  color: white;
}

.curriculum-lesson__title {
  flex: 1;
  font-size: var(--text-sm);
}

.curriculum-lesson__duration {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.curriculum-lesson--locked {
  opacity: 0.6;
  cursor: not-allowed;
}

.curriculum-lesson--locked:hover {
  background: transparent;
}

.curriculum-lesson--locked .curriculum-lesson__icon {
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
}

.curriculum-lesson--completed .curriculum-lesson__icon {
  background: var(--color-success);
  color: white;
}

.curriculum-more {
  text-align: center;
  padding: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

/* Resources Grid */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-4);
}

.resource-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  transition: all var(--duration-200) var(--ease-out);
}

.resource-card:hover {
  border-color: var(--color-primary-500);
  box-shadow: var(--shadow-glow);
}

.resource-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  color: var(--color-primary-400);
  flex-shrink: 0;
}

.resource-card__info h4 {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  margin-bottom: var(--space-1);
}

.resource-card__info span {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* Course Sidebar */
.course-sidebar {
  position: sticky;
  top: calc(56px + var(--space-6));
}

.course-sidebar__card {
  border-radius: var(--radius-2xl);
  overflow: hidden;
}

.course-sidebar__preview {
  position: relative;
  aspect-ratio: 16 / 9;
}

.course-sidebar__preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-sidebar__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.4);
  color: white;
  cursor: pointer;
  transition: background var(--duration-200) var(--ease-out);
}

.course-sidebar__play:hover {
  background: rgba(0, 0, 0, 0.6);
}

.course-sidebar__play svg {
  width: 64px;
  height: 64px;
  padding: var(--space-4);
  background: var(--color-primary-500);
  border-radius: var(--radius-full);
  transition: transform var(--duration-200) var(--ease-bounce);
}

.course-sidebar__play:hover svg {
  transform: scale(1.1);
}

.course-sidebar__body {
  padding: var(--space-6);
}

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

.course-sidebar__note {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  text-align: center;
}

.course-sidebar__features {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.course-sidebar__features li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.course-sidebar__features li svg {
  color: var(--color-success);
  flex-shrink: 0;
}

/* Mobile adjustments */
@media (max-width: 1023px) {
  .course-sidebar {
    position: static;
    order: -1;
  }
}