/* ============================================================
   COURSE DETAIL PAGE CSS - Premium UI/UX Max
   ============================================================ */

/* ── BREADCRUMB ───────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 0.8125rem;
  color: var(--ink-muted);
  font-weight: 500;
}
.breadcrumb a {
  color: var(--ink-muted);
  text-decoration: none;
  transition: color 200ms var(--ease-out);
}
.breadcrumb a:hover { 
  color: var(--accent-blue); 
}
.breadcrumb .sep { 
  opacity: 0.4; 
}
.breadcrumb .current { 
  color: var(--charcoal); 
  font-weight: 600;
}

/* ── COURSE HERO BLOCK ────────────────────────────────────── */
.course-hero {
  background: linear-gradient(180deg, #FDFDFD 0%, #F8F9FA 100%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  padding-block: var(--space-2xl) var(--space-xl);
  padding-top: 110px; /* navbar + breadcrumb */
  position: relative;
  overflow: hidden;
}

.course-hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50vw;
  height: 100%;
  background: radial-gradient(circle at 100% 50%, rgba(20, 100, 255, 0.03) 0%, transparent 60%);
  pointer-events: none;
}

.course-hero-inner {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
  position: relative;
  z-index: 5;
}

.course-level-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
  background: rgba(20, 100, 255, 0.1);
  color: var(--accent-blue);
  border: 1px solid rgba(20, 100, 255, 0.2);
}

.course-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--charcoal);
  line-height: 1.05;
  margin-bottom: var(--space-sm);
}

.course-hero-subtitle {
  font-size: 1.125rem;
  color: var(--ink-muted);
  font-weight: 500;
  margin-bottom: var(--space-lg);
  max-width: 600px;
}

.course-hero-meta {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}
.course-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--ink-muted);
  font-weight: 500;
}
.course-meta-item strong { 
  color: var(--charcoal); 
}
.meta-icon {
  color: var(--accent-blue);
  display: flex;
}

/* ── PREVENT OVERLAP ON DESKTOP ───────────────────────────── */
@media (min-width: 1025px) {
  .course-hero h1,
  .course-hero-subtitle,
  .course-hero-meta,
  .course-level-badge,
  .breadcrumb {
    max-width: 55%;
  }
}

/* ── COURSE BODY ──────────────────────────────────────────── */
.course-body {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
  padding-block: var(--space-2xl);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: start;
}

/* ── LEFT COLUMN ──────────────────────────────────────────── */
.content-section {
  margin-bottom: var(--space-2xl);
}
.content-section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--charcoal);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
}

/* Curriculum list */
.curriculum-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.curriculum-module {
  background: #FFF;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.02);
  transition: all 300ms var(--ease-out);
}
.curriculum-module:hover {
  border-color: rgba(20, 100, 255, 0.2);
  box-shadow: 0 8px 30px rgba(20, 100, 255, 0.05);
  transform: translateY(-2px);
}
.module-title {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--charcoal);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.module-num {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--accent-blue);
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 700;
  flex-shrink: 0;
}
.module-topics {
  padding-left: 40px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.module-topics li {
  font-size: 1rem;
  color: var(--ink-muted);
  line-height: 1.5;
  position: relative;
}
.module-topics li::before {
  content: '';
  position: absolute;
  left: -16px;
  top: 8px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(0,0,0,0.2);
}

/* Checklist items */
.checklist {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 1.0625rem;
  color: var(--charcoal);
  line-height: 1.5;
}
.feat-icon {
  margin-top: 2px;
  flex-shrink: 0;
}

/* Course description accordion */
.course-description {
  background: #FFF;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,0.03);
}
.course-desc-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--charcoal);
  cursor: pointer;
  background: transparent;
  border: none;
  text-align: left;
}
.course-desc-body {
  padding: 0 24px 24px;
  font-size: 1.0625rem;
  color: var(--ink-muted);
  line-height: 1.7;
}

/* ── RIGHT STICKY SIDEBAR ─────────────────────────────────── */
.course-sidebar {
  position: sticky;
  top: 100px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 24px;
  padding: 32px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.05), inset 0 0 0 1px rgba(255, 255, 255, 0.8);
  display: flex;
  flex-direction: column;
  margin-top: -280px; /* Fallback, JS will override for perfection */
  z-index: 10;
}

.sidebar-course-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 16px;
  margin-bottom: 16px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.08);
  order: 1;
}

.sidebar-price {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--charcoal);
  margin-bottom: 4px;
  line-height: 1;
  order: 2;
}
.sidebar-price-label {
  font-size: 0.875rem;
  color: var(--ink-muted);
  margin-bottom: 20px;
  font-weight: 500;
  order: 3;
}

.sidebar-ctas {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
  order: 4;
}
.sidebar-ctas .btn {
  width: 100%;
  justify-content: center;
  padding: 14px;
}

.sidebar-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid rgba(0,0,0,0.06);
  order: 5;
}
.sidebar-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--charcoal);
  font-weight: 500;
}

.sidebar-ctas {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.sidebar-ctas .btn {
  width: 100%;
  justify-content: center;
  padding: 14px;
}

/* ── OTHER COURSES ────────────────────────────────────────── */
.other-courses-section {
  background: #F8F9FA;
  padding-block: var(--space-2xl);
  border-top: 1px solid rgba(0,0,0,0.05);
}

.other-courses-section .course-card {
  display: flex !important;
  flex-direction: column !important;
  padding: 28px !important;
  background: #FFF !important;
  border: 1px solid rgba(0,0,0,0.06) !important;
  border-radius: 24px !important;
  gap: 16px !important;
  height: 100% !important;
  box-shadow: 0 4px 20px rgba(0,0,0,0.02) !important;
  text-decoration: none;
}
.other-courses-section .course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.06) !important;
  border-color: rgba(20, 100, 255, 0.2) !important;
}
.other-courses-section .card-header {
  display: flex !important;
  justify-content: space-between !important;
  align-items: center !important;
  margin-bottom: 8px !important;
}
.other-courses-section .card-category-badge {
  font-size: 0.75rem !important;
  font-weight: 700 !important;
  text-transform: uppercase !important;
  color: var(--accent-blue) !important;
  background: rgba(20, 100, 255, 0.1) !important;
  padding: 6px 12px !important;
  border-radius: 100px !important;
}
.other-courses-section .card-icon {
  font-size: 1.5rem !important;
}
.other-courses-section .card-title {
  font-family: var(--font-display) !important;
  font-size: 1.75rem !important;
  font-weight: 800 !important;
  color: var(--charcoal) !important;
  line-height: 1.1 !important;
  margin: 0 !important;
}
.other-courses-section .card-price-row {
  margin-top: auto !important;
  padding-top: 16px;
}
.other-courses-section .card-price {
  font-size: 1.75rem !important;
  font-weight: 800 !important;
  color: var(--charcoal) !important;
}
.other-courses-section .card-cta {
  display: inline-flex !important;
  align-items: center !important;
  gap: 8px !important;
  color: var(--accent-blue) !important;
  font-weight: 700 !important;
  text-decoration: none !important;
  font-size: 1rem !important;
  margin-top: 12px !important;
}
.other-courses-section .card-cta svg {
  width: 16px !important;
  height: 16px !important;
  stroke: currentColor !important;
  stroke-width: 2 !important;
  fill: none !important;
}

/* ── RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 1024px) {
  .course-body {
    grid-template-columns: 1fr;
  }
  .course-sidebar {
    position: static;
    order: -1;
    margin-top: 0; /* Reset negative margin on mobile */
  }
}
@media (max-width: 600px) {
  .course-hero { padding-top: 96px; }
  .course-hero-meta { flex-direction: column; align-items: flex-start; gap: 12px; }
}