.kienviet-breadcrumb-section {
  background: var(--background-secondary);
  padding: 20px 0;
  border-bottom: 1px solid var(--border-color);
}

.kienviet-breadcrumb {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
}

.kienviet-breadcrumb-link {
  color: var(--text-secondary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.kienviet-breadcrumb-link:hover {
  color: var(--primary-color);
}

.kienviet-breadcrumb-separator {
  color: var(--text-light);
  font-size: 0.75rem;
}

.kienviet-breadcrumb-current {
  color: var(--primary-color);
  font-weight: 600;
}

.kienviet-history-hero {
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  position: relative;
  overflow: hidden;
}

.kienviet-history-hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 10s ease-in-out infinite;
}

.kienviet-history-hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.05) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite reverse;
}

.kienviet-history-hero .kienviet-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: 100px 0 60px;
}

.kienviet-history-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.kienviet-hero-description {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.kienviet-founding-story {
  background: var(--background-primary);
}

.kienviet-founding-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.kienviet-founding-text h2 {
  margin-bottom: 24px;
  color: var(--text-primary);
}

.kienviet-founding-text p {
  margin-bottom: 20px;
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.kienviet-founding-highlights {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.kienviet-highlight-item {
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 20px;
  background: var(--background-secondary);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--primary-color);
  transition: var(--transition);
}

.kienviet-highlight-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

.kienviet-highlight-icon {
  width: 50px;
  height: 50px;
  background: var(--primary-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: white;
  flex-shrink: 0;
}

.kienviet-highlight-content h4 {
  margin-bottom: 4px;
  color: var(--text-primary);
  font-size: 1.125rem;
}

.kienviet-highlight-content p {
  color: var(--text-secondary);
  margin: 0;
  font-size: 0.95rem;
}

.kienviet-founding-image {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.kienviet-founding-image:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.kienviet-timeline-section {
  background: var(--background-secondary);
  position: relative;
}

.kienviet-timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.kienviet-timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--primary-gradient);
  transform: translateX(-50%);
}

.kienviet-timeline-item {
  position: relative;
  margin-bottom: 60px;
  display: flex;
  align-items: center;
  gap: 40px;
}

.kienviet-timeline-item:nth-child(odd) {
  flex-direction: row;
}

.kienviet-timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.kienviet-timeline-year {
  width: 80px;
  height: 80px;
  background: var(--primary-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
  position: relative;
  z-index: 2;
  box-shadow: var(--shadow-md);
}

.kienviet-timeline-content {
  flex: 1;
  background: white;
  padding: 32px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  position: relative;
}

.kienviet-timeline-content::before {
  content: '';
  position: absolute;
  top: 50%;
  width: 0;
  height: 0;
  border: 12px solid transparent;
  transform: translateY(-50%);
}

.kienviet-timeline-item:nth-child(odd) .kienviet-timeline-content::before {
  left: -24px;
  border-right-color: white;
}

.kienviet-timeline-item:nth-child(even) .kienviet-timeline-content::before {
  right: -24px;
  border-left-color: white;
}

.kienviet-timeline-content:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.kienviet-timeline-content h3 {
  margin-bottom: 12px;
  color: var(--text-primary);
  font-size: 1.25rem;
}

.kienviet-timeline-content p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

.kienviet-milestones {
  background: var(--background-primary);
}

.kienviet-milestones-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.kienviet-milestone-card {
  background: white;
  border-radius: var(--border-radius);
  padding: 40px 32px;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.kienviet-milestone-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transition: var(--transition);
}

.kienviet-milestone-card:hover::before {
  transform: scaleX(1);
}

.kienviet-milestone-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

.kienviet-milestone-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  background: var(--primary-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
  transition: var(--transition);
}

.kienviet-milestone-card:hover .kienviet-milestone-icon {
  transform: scale(1.1) rotate(5deg);
}

.kienviet-milestone-card h3 {
  margin-bottom: 8px;
  color: var(--text-primary);
}

.kienviet-milestone-year {
  color: var(--primary-color);
  font-weight: 700;
  font-size: 1.125rem;
  margin-bottom: 16px;
}

.kienviet-milestone-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

.kienviet-achievements {
  background: var(--background-secondary);
}

.kienviet-achievements-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.kienviet-achievements-text h2 {
  margin-bottom: 24px;
  color: var(--text-primary);
}

.kienviet-achievements-text > p {
  margin-bottom: 40px;
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.kienviet-achievement-stats {
  display: flex;
  gap: 40px;
  margin-bottom: 40px;
  padding: 32px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.kienviet-achievement-stat {
  text-align: center;
}

.kienviet-stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary-color);
  line-height: 1;
  display: block;
  margin-bottom: 8px;
}

.kienviet-stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.kienviet-back-link {
  margin-top: 32px;
}

.kienviet-achievements-image {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

@media (max-width: 1024px) {
  .kienviet-history-hero h1 {
    font-size: 2.5rem;
  }
  
  .kienviet-founding-content {
    grid-template-columns: 1fr;
    gap: 60px;
  }
  
  .kienviet-timeline::before {
    left: 40px;
  }
  
  .kienviet-timeline-item {
    flex-direction: row !important;
    padding-left: 100px;
  }
  
  .kienviet-timeline-year {
    position: absolute;
    left: 0;
  }
  
  .kienviet-timeline-content::before {
    left: -24px !important;
    right: auto !important;
    border-right-color: white !important;
    border-left-color: transparent !important;
  }
  
  .kienviet-milestones-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .kienviet-achievements-content {
    grid-template-columns: 1fr;
    gap: 60px;
  }
}

@media (max-width: 768px) {
  .kienviet-breadcrumb {
    flex-wrap: wrap;
    gap: 8px;
  }
  
  .kienviet-history-hero .kienviet-hero-content {
    padding: 80px 0 40px;
  }
  
  .kienviet-history-hero h1 {
    font-size: 2rem;
  }
  
  .kienviet-founding-highlights {
    gap: 16px;
  }
  
  .kienviet-highlight-item {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }
  
  .kienviet-timeline {
    padding-left: 0;
  }
  
  .kienviet-timeline::before {
    left: 20px;
  }
  
  .kienviet-timeline-item {
    padding-left: 60px;
  }
  
  .kienviet-timeline-year {
    width: 60px;
    height: 60px;
    font-size: 0.95rem;
  }
  
  .kienviet-achievement-stats {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .kienviet-history-hero .kienviet-hero-content {
    padding: 60px 0 30px;
  }
  
  .kienviet-history-hero h1 {
    font-size: 1.75rem;
  }
  
  .kienviet-timeline-content {
    padding: 24px 20px;
  }
  
  .kienviet-milestone-card {
    padding: 32px 24px;
  }
}