/* Experience Section Styles */
.experience-section {
  background-color: var(--bg-primary);
}

.experience-timeline {
  position: relative;
}

.experience-timeline::before {
  content: '';
  position: absolute;
  left: 30px;
  top: 0;
  bottom: var(--space-8); /* Stop at the bottom of the last card, accounting for its margin */
  width: 2px;
  background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
  z-index: 1;
}

.experience-card {
  background-color: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-8);
  padding: var(--space-8);
  position: relative;
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
}

.experience-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.experience-card::before {
  content: '';
  position: absolute;
  left: -45px;
  top: 40px;
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: 50%;
  border: 4px solid var(--bg-primary);
  z-index: 2;
  box-shadow: var(--shadow-md);
}

.experience-card-research {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  border-left: 4px solid var(--accent-color);
}

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

.company-info {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.company-logo {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-color));
  border-radius: var(--radius-base);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.company-logo svg {
  width: 32px;
  height: 32px;
  color: var(--primary-color);
}

.company-details {
  flex: 1;
}

.role-title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.company-name {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--primary-color);
  margin-bottom: var(--space-3);
}

.location-period {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  margin-bottom: var(--space-2);
}

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

.location svg,
.period svg {
  color: var(--primary-color);
}

.badge {
  margin-left: auto;
}

.card-body {
  margin-top: var(--space-6);
}

.achievements-list {
  list-style: none;
  margin-bottom: var(--space-6);
}

.achievements-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding: var(--space-3);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-base);
  transition: all var(--transition-fast);
}

.achievements-list li:hover {
  background-color: var(--primary-light);
  transform: translateX(4px);
}

.achievement-icon {
  color: var(--accent-color);
  font-weight: var(--font-bold);
  font-size: var(--text-lg);
  flex-shrink: 0;
  margin-top: 2px;
}

.achievements-list li p {
  margin: 0;
  line-height: var(--leading-relaxed);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tech-tags .tag {
  background: linear-gradient(135deg, var(--primary-light), var(--accent-color));
  color: var(--primary-color);
  font-weight: var(--font-medium);
  transition: all var(--transition-fast);
}

.tech-tags .tag:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.research-summary {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  background-color: var(--bg-secondary);
  padding: var(--space-4);
  border-radius: var(--radius-base);
  border-left: 4px solid var(--accent-color);
  margin-bottom: var(--space-4);
}

/* Responsive Design */
@media (max-width: 768px) {
  .experience-timeline::before {
    left: 20px;
  }
  
  .experience-card::before {
    left: -30px;
    width: 16px;
    height: 16px;
  }
  
  .experience-card {
    padding: var(--space-6);
    margin-left: var(--space-8);
  }
  
  .company-info {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .company-logo {
    width: 50px;
    height: 50px;
  }
  
  .company-logo svg {
    width: 28px;
    height: 28px;
  }
  
  .location-period {
    justify-content: center;
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .badge {
    margin-left: 0;
    margin-top: var(--space-2);
  }
}

@media (max-width: 480px) {
  .experience-card {
    padding: var(--space-4);
    margin-left: var(--space-6);
  }
  
  .role-title {
    font-size: var(--text-lg);
  }
  
  .company-name {
    font-size: var(--text-base);
  }
  
  .achievements-list li {
    padding: var(--space-2);
  }
  
  .achievement-icon {
    font-size: var(--text-base);
  }
}

/* Animation for cards appearing */
.experience-card {
  opacity: 0;
  transform: translateX(-30px);
  animation: slideInLeft 0.6s ease-out forwards;
}

.experience-card:nth-child(1) { animation-delay: 0.1s; }
.experience-card:nth-child(2) { animation-delay: 0.2s; }
.experience-card:nth-child(3) { animation-delay: 0.3s; }
.experience-card:nth-child(4) { animation-delay: 0.4s; }

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Hover effects for interactive elements */
.achievements-list li:hover .achievement-icon {
  transform: scale(1.2);
}

.company-logo:hover {
  transform: scale(1.1);
}

.tech-tags .tag:hover {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
}

/* Focus states for accessibility */
.experience-card:focus-within {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.achievements-list li:focus-within {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}