/* ===== CERTIFICATES PAGE SPECIFIC STYLES ===== */

/* Navigation Active State */
.nav-links a.active {
  color: var(--accent-primary);
  font-weight: 600;
}

.nav-links a.active::after {
  width: 100%;
}

/* Certificates Header */
#certificates-header {
  min-height: 50vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8rem 5% 4rem;
  text-align: center;
}

.header-content {
  max-width: 900px;
  margin: 0 auto;
}

.certificates-intro {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 700px;
  margin: 0 auto;
}

/* Certificates Main Section */
#certificates-main {
  padding: 2rem 5% 5rem;
  min-height: auto;
  display: flex;
  flex-direction: column;
  gap: 4rem;
  max-width: 1100px;
  margin: 0 auto;
}

/* ===== CATEGORY SECTIONS ===== */

.cert-category {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.cert-category-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border-color);
}

.cert-category-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--accent-gradient);
  color: #fff;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.cert-category-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Certificates Grid (vertical stack within each category) */
.certificates-grid {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* Certificate Item */
.certificate-item {
  display: grid;
  gap: 2.5rem;
  background: var(--card-bg);
  border-radius: 25px;
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--border-color);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  animation: fadeInScale 0.6s ease-out backwards;
}

.certificate-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--accent-primary);
}

/* Horizontal Layout (Default for larger screens) */
.certificate-item.horizontal {
  grid-template-columns: 1.2fr 1fr;
  align-items: start;
}

/* Vertical Layout */
.certificate-item.vertical {
  grid-template-columns: 1fr;
}

.certificate-item.vertical .certificate-frame {
  max-width: 600px;
  margin: 0 auto;
}

/* Certificate Frame */
.certificate-frame {
  position: relative;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
  padding: 1.5rem;
  transition: all 0.3s ease;
}

[data-theme="dark"] .certificate-frame {
  background: linear-gradient(135deg, #0f1f3a 0%, #060d1e 100%);
}

.certificate-frame::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border: 4px solid transparent;
  border-radius: 15px;
  background: linear-gradient(135deg, #333333 0%, #000000 100%);
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.certificate-item:hover .certificate-frame::before {
  opacity: 1;
}

.certificate-image-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .certificate-image-wrapper {
  background: #0a1628;
}

.certificate-image-wrapper img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

.certificate-item:hover .certificate-image-wrapper img {
  transform: scale(1.05);
}

/* Certificate Details */
.certificate-details {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 0.5rem 0;
}

.certificate-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--accent-gradient);
  color: white;
  padding: 0.6rem 1.5rem;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  align-self: flex-start;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
  transition: all 0.3s ease;
}

.certificate-item:hover .certificate-badge {
  transform: translateX(5px);
  box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

.certificate-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin: 0;
  transition: color 0.3s ease;
}

.certificate-item:hover .certificate-title {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Certificate Meta Information */
.certificate-meta {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: 12px;
  border-left: 4px solid var(--accent-primary);
}

.meta-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1rem;
  align-items: baseline;
}

.meta-label {
  font-weight: 600;
  color: var(--text-tertiary);
  font-size: 0.95rem;
}

.meta-value {
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 500;
}

/* Certificate Description */
.certificate-description {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1.05rem;
  margin: 0;
  text-align: justify;
}

/* Back to Home Section */
#back-to-home {
  min-height: auto;
  padding: 3rem 5%;
  text-align: center;
}

/* Stagger Animation */
.certificate-item:nth-child(1) { animation-delay: 0.1s; }
.certificate-item:nth-child(2) { animation-delay: 0.15s; }
.certificate-item:nth-child(3) { animation-delay: 0.2s; }
.certificate-item:nth-child(4) { animation-delay: 0.25s; }
.certificate-item:nth-child(5) { animation-delay: 0.3s; }
.certificate-item:nth-child(6) { animation-delay: 0.35s; }
.certificate-item:nth-child(7) { animation-delay: 0.4s; }
.certificate-item:nth-child(8) { animation-delay: 0.45s; }

/* ===== RESPONSIVE DESIGN ===== */

/* Large Tablets and Small Laptops */
@media screen and (max-width: 1200px) {
  .certificate-item.horizontal {
    grid-template-columns: 1fr;
  }
  
  .certificate-title {
    font-size: 1.8rem;
  }
}

/* Tablets */
@media screen and (max-width: 900px) {
  #certificates-header {
    padding: 6rem 5% 3rem;
    min-height: 40vh;
  }
  
  .certificates-intro {
    font-size: 1.05rem;
  }
  
  .certificate-item {
    padding: 2rem;
    gap: 2rem;
  }
  
  .certificate-title {
    font-size: 1.6rem;
  }
  
  .certificate-frame {
    padding: 1.2rem;
  }

  .cert-category-title {
    font-size: 1.3rem;
  }
}

/* Mobile Landscape and Small Tablets */
@media screen and (max-width: 768px) {
  #certificates-header {
    padding: 5rem 4% 2.5rem;
  }
  
  .certificates-intro {
    font-size: 1rem;
  }
  
  .certificates-grid {
    gap: 2rem;
  }
  
  .certificate-item {
    padding: 1.5rem;
    gap: 1.5rem;
  }
  
  .certificate-title {
    font-size: 1.5rem;
  }
  
  .certificate-description {
    font-size: 1rem;
  }
  
  .meta-item {
    grid-template-columns: 100px 1fr;
    gap: 0.8rem;
  }
  
  .certificate-meta {
    padding: 1.2rem;
  }

  #certificates-main {
    gap: 3rem;
  }
}

/* Mobile Phones */
@media screen and (max-width: 600px) {
  #certificates-header {
    padding: 4rem 3% 2rem;
  }
  
  .title {
    font-size: 1.8rem;
  }
  
  .certificates-intro {
    font-size: 0.95rem;
  }
  
  .certificates-grid {
    gap: 1.5rem;
  }
  
  .certificate-item {
    padding: 1.2rem;
    gap: 1.2rem;
  }
  
  .certificate-frame {
    padding: 1rem;
  }
  
  .certificate-title {
    font-size: 1.3rem;
  }
  
  .certificate-badge {
    font-size: 0.85rem;
    padding: 0.5rem 1.2rem;
  }
  
  .certificate-description {
    font-size: 0.95rem;
  }
  
  .meta-item {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
  
  .meta-label {
    font-size: 0.85rem;
  }
  
  .meta-value {
    font-size: 0.95rem;
  }

  .cert-category-title {
    font-size: 1.1rem;
  }

  .cert-category-icon {
    width: 34px;
    height: 34px;
    font-size: 1rem;
  }

  #certificates-main {
    gap: 2.5rem;
  }
}

/* Extra Small Phones */
@media screen and (max-width: 480px) {
  .certificate-title {
    font-size: 1.2rem;
  }
  
  .certificate-item {
    padding: 1rem;
  }
  
  .certificate-frame {
    padding: 0.8rem;
  }
}

/* High Resolution Displays */
@media screen and (min-width: 1920px) {
  #certificates-main {
    max-width: 1600px;
  }
  
  .certificate-title {
    font-size: 2.2rem;
  }
  
  .certificate-description {
    font-size: 1.15rem;
  }
}