/* Certification Page Styles */
:root {
  --transition-bezier: cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* Certification Section */
.certifications-section {
  padding-top: 120px;
}

/* Certification Container */
.certs-container {
  max-width: 1200px;
  margin: 0 auto;
}

/* Introduction Section */
.cert-intro {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3rem;
  padding: 2rem;
  border-radius: var(--border-radius);
  background: var(--card-light);
  box-shadow: var(--box-shadow);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.dark-mode .cert-intro {
  background: var(--card-dark);
}

.cert-intro p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

/* Certification Highlights */
.cert-highlights {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 2rem;
}

.cert-highlight {
  text-align: center;
  animation: fadeIn 0.8s ease forwards;
  animation-delay: calc(0.2s * var(--i, 0));
  opacity: 0;
}

.cert-highlight-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--primary-color);
  color: var(--background-light);
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 0.5rem;
  box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.cert-highlight-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin: 0.5rem 0;
  font-family: var(--font-heading);
}

.cert-highlight-label {
  font-size: 0.9rem;
  color: var(--secondary-color);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Certification Categories Filter */
.cert-categories {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 3rem;
}

.cert-category-btn {
  background: none;
  border: 1px solid var(--primary-color);
  padding: 0.6rem 1.2rem;
  border-radius: 30px;
  color: var(--primary-color);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.cert-category-btn:hover,
.cert-category-btn.active {
  background: var(--primary-color);
  color: var(--background-light);
}

.dark-mode .cert-category-btn {
  border-color: var(--cream);
  color: var(--cream);
}

.dark-mode .cert-category-btn:hover,
.dark-mode .cert-category-btn.active {
  background: var(--cream);
  color: var(--dark-green);
}

/* Enhanced Certification Cards */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 2rem;
}

.cert-card {
  border-radius: var(--border-radius);
  background: var(--card-light);
  box-shadow: var(--box-shadow);
  overflow: hidden;
  transition: all 0.4s var(--transition-bezier);
  position: relative;
  opacity: 0;
  animation: slideInUp 0.6s var(--transition-bezier) forwards;
  animation-delay: calc(0.1s * var(--i, 0));
}

.cert-card:nth-child(1) { --i: 1; }
.cert-card:nth-child(2) { --i: 2; }
.cert-card:nth-child(3) { --i: 3; }
.cert-card:nth-child(4) { --i: 4; }
.cert-card:nth-child(5) { --i: 5; }
.cert-card:nth-child(6) { --i: 6; }
.cert-card:nth-child(7) { --i: 7; }
.cert-card:nth-child(8) { --i: 8; }

.dark-mode .cert-card {
  background: var(--card-dark);
}

.cert-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 0;
  background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
  transition: height 0.6s var(--transition-bezier);
}

.cert-card:hover::before {
  height: 100%;
}

.cert-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 30px rgba(0,0,0,0.15);
}

.cert-content {
  padding: 2rem;
}

.cert-header {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.cert-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: var(--cream);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  transition: all 0.4s var(--transition-bezier);
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  flex-shrink: 0;
  margin-right: 1.5rem;
}

.cert-card:hover .cert-icon {
  background: var(--primary-color);
  color: var(--background-light);
  transform: rotate(10deg) scale(1.1);
}

.dark-mode .cert-icon {
  background: var(--brown);
  color: var(--cream);
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.cert-issuer {
  display: block;
  font-size: 0.9rem;
  color: var(--secondary-color);
  margin-bottom: 0.3rem;
}

.dark-mode .cert-issuer {
  color: var(--cream);
}

.cert-title {
  font-family: var(--font-heading);
  color: var(--primary-color);
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.dark-mode .cert-title {
  color: var(--accent-color);
}

.cert-card p {
  color: var(--text-light);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.dark-mode .cert-card p {
  color: var(--text-dark);
}

/* Certification Details Section */
.cert-details {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(0,0,0,0.05);
  padding-top: 1.5rem;
  margin-top: 1.5rem;
}

.dark-mode .cert-details {
  border-color: rgba(255,255,255,0.1);
}

.cert-meta {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.cert-meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-light);
}

.dark-mode .cert-meta-item {
  color: var(--text-dark);
}

.cert-meta-item i {
  color: var(--accent-color);
  font-size: 1rem;
}

.badge {
  display: inline-block;
  padding: 0.5em 1em;
  font-size: 0.75em;
  font-weight: 700;
  line-height: 1;
  color: var(--background-light);
  background-color: var(--accent-color);
  text-align: center;
  white-space: nowrap;
  vertical-align: baseline;
  border-radius: 30px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.dark-mode .badge {
  background-color: var(--primary-color);
}

.cert-action {
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
}

.cert-card:hover .cert-action {
  opacity: 1;
  transform: translateY(0);
}

.cert-action .btn-small {
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
  background: transparent;
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
  border-radius: 20px;
  transition: var(--transition);
}

.cert-action .btn-small:hover {
  background: var(--primary-color);
  color: var(--background-light);
}

.dark-mode .cert-action .btn-small {
  border-color: var(--cream);
  color: var(--cream);
}

.dark-mode .cert-action .btn-small:hover {
  background: var(--cream);
  color: var(--dark-green);
}

.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

/* Timeline View */
.cert-timeline {
  margin-top: 5rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

.cert-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 4px;
  background: var(--cream);
  transform: translateX(-50%);
  border-radius: 2px;
}

.dark-mode .cert-timeline::before {
  background: var(--brown);
}

.timeline-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateY(0);
}

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

.timeline-content {
  width: 45%;
}

.timeline-content .cert-card {
  margin: 0;
  animation: none;
  opacity: 1;
}

.timeline-marker {
  position: relative;
  width: 10%;
  display: flex;
  justify-content: center;
}

.timeline-date {
  width: 80px;
  height: 80px;
  background: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--background-light);
  font-weight: 700;
  font-size: 1.1rem;
  z-index: 2;
  box-shadow: 0 0 0 5px var(--background-light), 0 0 0 10px rgba(74, 103, 65, 0.2);
}

.dark-mode .timeline-date {
  box-shadow: 0 0 0 5px var(--background-dark), 0 0 0 10px rgba(224, 159, 62, 0.3);
}

.timeline-line {
  position: absolute;
  width: 100px;
  height: 4px;
  background: var(--cream);
  top: 50%;
  transform: translateY(-50%);
}

.timeline-item:nth-child(odd) .timeline-line {
  right: 50%;
}

.timeline-item:nth-child(even) .timeline-line {
  left: 50%;
}

.dark-mode .timeline-line {
  background: var(--brown);
}

/* Animations */
@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { 
    opacity: 0; 
  }
  to { 
    opacity: 1; 
  }
}

/* Utility classes */
.text-center {
  text-align: center;
}

.cert-timeline-title {
  margin: 5rem 0 3rem;
  color: var(--primary-color);
  position: relative;
  display: inline-block;
  padding-bottom: 1rem;
}

.cert-timeline-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 25%;
  width: 50%;
  height: 3px;
  background: linear-gradient(to right, transparent, var(--accent-color), transparent);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: -50px;
  right: 30px;
  width: 50px;
  height: 50px;
  background-color: var(--primary-color);
  color: var(--background-light);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--box-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  z-index: 99;
  opacity: 0;
  transition: all 0.3s ease-in-out;
}

.back-to-top.visible {
  bottom: 30px;
  opacity: 1;
}

.back-to-top:hover {
  background-color: var(--accent-color);
  transform: translateY(-5px);
}

.dark-mode .back-to-top {
  background-color: var(--accent-color);
  color: var(--dark-green);
}

.dark-mode .back-to-top:hover {
  background-color: var(--cream);
}

/* Media Queries */
@media (max-width: 992px) {
  .cert-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
  
  .cert-highlights {
    flex-wrap: wrap;
    gap: 2rem;
  }
  
  .cert-highlight {
    flex: 0 0 calc(50% - 1rem);
  }
}

@media (max-width: 768px) {
  .cert-timeline::before {
    left: 30px;
  }
  
  .timeline-item {
    flex-direction: row-reverse !important;
    justify-content: flex-start;
    margin-left: 30px;
  }
  
  .timeline-content {
    width: calc(100% - 90px);
  }
  
  .timeline-marker {
    width: 60px;
    margin-right: 30px;
  }
  
  .timeline-date {
    width: 60px;
    height: 60px;
    font-size: 0.9rem;
  }
  
  .timeline-line {
    width: 30px;
  }
  
  .timeline-item .timeline-line {
    left: 50% !important;
  }
}

@media (max-width: 576px) {
  .cert-grid {
    grid-template-columns: 1fr;
  }
  
  .cert-highlight {
    flex: 0 0 100%;
  }
  
  .cert-categories {
    overflow-x: auto;
    padding-bottom: 1rem;
    justify-content: flex-start;
    gap: 0.3rem;
  }
  
  .cert-category-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    white-space: nowrap;
  }
  
  .cert-title {
    font-size: 1.1rem;
    line-height: 1.4;
    word-wrap: break-word;
  }
  
  .cert-header {
    flex-direction: column;
  }
  
  .cert-icon {
    margin-right: 0;
    margin-bottom: 1rem;
  }
  
  .cert-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.8rem;
  }
  
  .cert-details {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .cert-action {
    opacity: 1;
    transform: translateY(0);
    width: 100%;
  }
  
  .cert-action .btn-small {
    display: block;
    width: 100%;
    text-align: center;
  }
}