/* ============================================
   COURSES PAGE STYLES
   ============================================ */

/* Page Header */
.page-header {
  padding: calc(var(--space-32) + 56px) 0 var(--space-8);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

.page-header__content {
  text-align: center;
  margin-bottom: var(--space-10);
}

.page-header__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-4);
}

.page-header__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: var(--max-width-2xl);
  margin-inline: auto;
}

/* Search & Toolbar */
.courses-toolbar {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .courses-toolbar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.search-box {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.search-box__icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-box__input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-12);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: all var(--duration-200) var(--ease-out);
}

.search-box__input::placeholder {
  color: var(--text-tertiary);
}

.search-box__input:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Filter Pills */
.filter-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.filter-pill {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--duration-200) var(--ease-out);
}

.filter-pill:hover {
  color: var(--text-primary);
  border-color: var(--text-tertiary);
}

.filter-pill.is-active {
  color: white;
  background: var(--color-primary-500);
  border-color: var(--color-primary-500);
}

/* Results Bar */
.courses-results {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
}

.courses-results__count {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

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

.courses-sort {
  padding: var(--space-2) var(--space-3);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-sm);
  cursor: pointer;
}

.courses-sort:focus {
  outline: none;
  border-color: var(--color-primary-500);
}

/* Enhanced Course Card for Catalog */
.course-card a {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: inherit;
  text-decoration: none;
}

.course-card__description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-3);
}

/* Empty State */
.courses-empty {
  text-align: center;
  padding: var(--space-16) var(--space-4);
}

.courses-empty__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-6);
  color: var(--text-tertiary);
}

.courses-empty__title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
}

.courses-empty__text {
  color: var(--text-secondary);
}

/* Animation for cards appearing */
.course-card {
  opacity: 0;
  transform: translateY(20px);
}

.course-card.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--duration-500) var(--ease-out),
              transform var(--duration-500) var(--ease-out);
}

/* Stagger animation */
.course-card:nth-child(1) { transition-delay: 0ms; }
.course-card:nth-child(2) { transition-delay: 50ms; }
.course-card:nth-child(3) { transition-delay: 100ms; }
.course-card:nth-child(4) { transition-delay: 150ms; }
.course-card:nth-child(5) { transition-delay: 200ms; }
.course-card:nth-child(6) { transition-delay: 250ms; }
.course-card:nth-child(7) { transition-delay: 300ms; }
.course-card:nth-child(8) { transition-delay: 350ms; }
.course-card:nth-child(9) { transition-delay: 400ms; }