/* ==========================================
   Certifications Page Styling (Glassmorphism)
   ========================================== */

.cert-container {
  max-width: 1060px;
  margin: 0 auto;
  padding: 140px var(--spacing-6) var(--spacing-24);
}

/* Header Section */
.cert-header {
  text-align: center;
  margin-bottom: var(--spacing-12);
}

.cert-badge-top {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: 6px 16px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur-sm);
  -webkit-backdrop-filter: var(--glass-blur-sm);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--accent);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-4);
  box-shadow: var(--shadow-sm);
}

.cert-badge-top i {
  font-size: var(--font-size-base);
}

.cert-header h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-3);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-primary) 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cert-header .subtitle {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Controls Bar (Filter + View Switcher) */
.cert-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-12);
  padding: var(--spacing-3) var(--spacing-4);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-glass);
}

.cert-filters {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  flex-wrap: wrap;
}

.filter-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: var(--transition-base);
}

.filter-btn:hover {
  color: var(--text-primary);
  background: var(--glass-bg-hover);
}

.filter-btn.active {
  background: var(--accent-gradient);
  color: #FFFFFF;
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--glow-accent);
  border-color: transparent;
}

.view-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-secondary);
  padding: 4px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
}

.view-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-base);
}

.view-btn i {
  font-size: var(--font-size-base);
}

.view-btn:hover {
  color: var(--text-primary);
}

.view-btn.active {
  background: var(--glass-bg-strong);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

/* Timeline Layout */
.cert-timeline-wrapper {
  position: relative;
}

.cert-timeline {
  position: relative;
  padding-left: var(--spacing-12);
}

/* Vertical Timeline Gradient Line */
.cert-timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 15px;
  bottom: 15px;
  width: 3px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-2) 60%, rgba(139, 92, 246, 0.1) 100%);
  border-radius: var(--radius-full);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* Timeline Item Container */
.cert-item {
  position: relative;
  margin-bottom: var(--spacing-8);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.cert-item.hidden {
  display: none !important;
}

/* Timeline Dot / Node */
.cert-node {
  position: absolute;
  left: -48px;
  top: 24px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--bg-base);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px var(--accent-light), 0 0 16px var(--accent-glow);
  z-index: 2;
  transition: var(--transition-base);
}

.cert-item:hover .cert-node {
  background: var(--accent);
  transform: scale(1.25);
  box-shadow: 0 0 0 6px var(--accent-light), 0 0 24px var(--accent-glow);
}

/* Certification Card Panel */
.cert-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--spacing-6);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: var(--spacing-6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.cert-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent-gradient);
  opacity: 0;
  transition: var(--transition-base);
}

.cert-card:hover {
  transform: translateY(-4px);
  border-color: var(--glass-border-hover);
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5), 0 0 30px var(--accent-glow);
}

.cert-card:hover::before {
  opacity: 1;
}

/* Logo Image Container */
.cert-image-container {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-4);
  height: 180px;
  position: relative;
  overflow: hidden;
  transition: var(--transition-base);
}

:root[data-theme="light"] .cert-image-container {
  background: rgba(255, 255, 255, 0.6);
}

.cert-image-container img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.3));
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.cert-card:hover .cert-image-container img {
  transform: scale(1.08) rotate(1deg);
}

/* Card Main Content */
.cert-content {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.cert-meta-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-2);
  flex-wrap: wrap;
}

.cert-title-group h2 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.cert-issuer {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
}

.cert-issuer i {
  color: var(--accent);
}

.cert-date-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--accent-light);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-full);
  color: var(--accent);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
}

.cert-description {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  margin: var(--spacing-3) 0 var(--spacing-4);
}

/* Skills list */
.cert-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-4);
}

.cert-skills .tag {
  font-size: var(--font-size-xs);
  padding: 4px 10px;
  background: var(--glass-bg);
}

.cert-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-3);
  border-top: 1px solid var(--border-light);
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

.cert-id-tag {
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
  font-family: monospace;
  display: flex;
  align-items: center;
  gap: 4px;
}

.cert-verify-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--accent);
  transition: var(--transition-base);
}

.cert-verify-link:hover {
  color: var(--text-primary);
  transform: translateX(3px);
}

/* Mode Grid Layout Switch */
.cert-grid-mode .cert-timeline::before,
.cert-grid-mode .cert-node {
  display: none;
}

.cert-grid-mode .cert-timeline {
  padding-left: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-6);
}

.cert-grid-mode .cert-card {
  grid-template-columns: 1fr;
  gap: var(--spacing-4);
}

.cert-grid-mode .cert-image-container {
  height: 160px;
}

/* Responsive Media Queries */
@media (max-width: 868px) {
  .cert-card {
    grid-template-columns: 140px 1fr;
    gap: var(--spacing-4);
  }

  .cert-image-container {
    height: 140px;
  }
}

@media (max-width: 768px) {
  .cert-container {
    padding-top: 110px;
  }

  .cert-header h1 {
    font-size: var(--font-size-3xl);
  }

  .cert-controls {
    flex-direction: column;
    align-items: stretch;
    border-radius: var(--radius-lg);
  }

  .cert-filters {
    justify-content: center;
  }

  .view-switcher {
    align-self: center;
  }

  .cert-timeline {
    padding-left: var(--spacing-8);
  }

  .cert-timeline::before {
    left: 10px;
  }

  .cert-node {
    left: -32px;
    width: 18px;
    height: 18px;
    top: 20px;
  }

  .cert-card {
    grid-template-columns: 1fr;
  }

  .cert-image-container {
    height: 150px;
  }
}

@media (max-width: 480px) {
  .cert-filters {
    gap: 4px;
  }

  .filter-btn {
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-xs);
  }

  .cert-title-group h2 {
    font-size: var(--font-size-lg);
  }

  .cert-timeline {
    padding-left: var(--spacing-6);
  }

  .cert-timeline::before {
    left: 6px;
  }

  .cert-node {
    left: -24px;
    width: 14px;
    height: 14px;
    top: 22px;
    border-width: 2px;
  }
}