/**
 * Course Detail Page Styles
 * Beautiful, immersive course landing pages
 */

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a2e;
  --bg-card: #16162a;
  
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --text-muted: #6a6a80;
  
  --accent-primary: #7986cb;
  --accent-secondary: #4db6ac;
  --accent-warning: #ffd54f;
  --accent-error: #ef5350;
  --accent-success: #66bb6a;
  
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
}

/* ===== Hero Section ===== */
.course-hero {
  position: relative;
  padding: 6rem 2rem 4rem;
  overflow: hidden;
}

.course-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
}

.course-hero.apprentice::before {
  background: 
    radial-gradient(ellipse at 30% 0%, rgba(171, 71, 188, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 100%, rgba(121, 134, 203, 0.15) 0%, transparent 50%);
}

.course-hero.undergrad::before {
  background: 
    radial-gradient(ellipse at 30% 0%, rgba(121, 134, 203, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 100%, rgba(77, 182, 172, 0.15) 0%, transparent 50%);
}

.course-hero.junior::before {
  background: 
    radial-gradient(ellipse at 30% 0%, rgba(255, 213, 79, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 100%, rgba(255, 112, 67, 0.15) 0%, transparent 50%);
}

.course-hero.senior::before {
  background: 
    radial-gradient(ellipse at 30% 0%, rgba(77, 182, 172, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 100%, rgba(38, 166, 154, 0.15) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
}

.hero-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4rem;
}

.back-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.back-link:hover {
  color: var(--text-primary);
}

.auth-buttons {
  display: flex;
  gap: 1rem;
}

.auth-btn {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease;
}

.auth-btn.login {
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.auth-btn.login:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.2);
}

.auth-btn.register {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
}

.auth-btn.register:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(121, 134, 203, 0.4);
}

.hero-main {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 4rem;
  align-items: start;
}

.hero-text {
  max-width: 700px;
}

.course-badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(121, 134, 203, 0.15);
  color: var(--accent-primary);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 20px;
  margin-bottom: 1.5rem;
}

.course-icon-large {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  display: block;
}

.course-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.course-tagline {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.course-meta-row {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
}

.meta-item .icon {
  font-size: 1.25rem;
}

.three-forces-preview {
  display: flex;
  gap: 2rem;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.force-preview {
  text-align: center;
  flex: 1;
}

.force-preview .icon {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.force-preview .name {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.force-preview .desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Enrollment Card */
.enrollment-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  position: sticky;
  top: 2rem;
}

.enrollment-price {
  text-align: center;
  margin-bottom: 1.5rem;
}

.price-tag {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
}

.price-note {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.enroll-btn {
  display: block;
  width: 100%;
  padding: 1rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  text-align: center;
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-bottom: 1rem;
}

.enroll-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(121, 134, 203, 0.4);
}

.enroll-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.enrollment-features {
  list-style: none;
  margin-top: 1.5rem;
}

.enrollment-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.enrollment-features li:last-child {
  border-bottom: none;
}

.enrollment-features .check {
  color: var(--accent-success);
}

/* ===== Course Content ===== */
.course-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.content-section {
  margin-bottom: 4rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.1), transparent);
}

/* What You'll Learn */
.learn-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.learn-item {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.learn-item .icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.learn-item h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.learn-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Curriculum */
.curriculum-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chapter-item {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  overflow: hidden;
  transition: all 0.3s ease;
}

.chapter-item:hover {
  border-color: rgba(121, 134, 203, 0.3);
}

.chapter-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
}

.chapter-number {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.chapter-info {
  flex: 1;
}

.chapter-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.chapter-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.chapter-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.chapter-content {
  padding: 0 1.5rem 1.5rem;
  padding-left: 4.5rem;
  display: none;
}

.chapter-item.open .chapter-content {
  display: block;
}

.chapter-topics {
  list-style: none;
}

.chapter-topics li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.chapter-topics li::before {
  content: '○';
  color: var(--accent-primary);
}

/* Instructor */
.instructor-card {
  display: flex;
  gap: 2rem;
  padding: 2rem;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.instructor-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  flex-shrink: 0;
}

.instructor-info h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.instructor-title {
  color: var(--accent-primary);
  margin-bottom: 1rem;
}

.instructor-bio {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.instructor-stats {
  display: flex;
  gap: 2rem;
}

.instructor-stat {
  text-align: center;
}

.instructor-stat .value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
}

.instructor-stat .label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  overflow: hidden;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-weight: 500;
}

.faq-question .toggle {
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

.faq-item.open .faq-question .toggle {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.5rem 1.5rem;
  color: var(--text-secondary);
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

/* CTA Section */
.cta-section {
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  border-radius: var(--radius-xl);
  margin: 2rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.cta-title {
  font-family: var(--font-display);
  font-size: 2rem;
  margin-bottom: 1rem;
}

.cta-subtitle {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
}

.cta-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(121, 134, 203, 0.4);
}

/* Footer */
.course-footer {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.course-footer a {
  color: var(--accent-primary);
  text-decoration: none;
}

/* Responsive */
@media (max-width: 900px) {
  .hero-main {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .enrollment-card {
    position: static;
  }
  
  .instructor-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .instructor-stats {
    justify-content: center;
  }
}

@media (max-width: 600px) {
  .course-hero {
    padding: 3rem 1rem 2rem;
  }
  
  .hero-nav {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
  
  .auth-buttons {
    width: 100%;
    justify-content: flex-end;
  }
  
  .three-forces-preview {
    flex-direction: column;
    gap: 1rem;
  }
  
  .course-meta-row {
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .chapter-header {
    flex-wrap: wrap;
  }
  
  .chapter-meta {
    width: 100%;
    margin-top: 0.5rem;
    padding-left: 3.5rem;
  }
}