/* ==========================================================================
   Certifications page
   ========================================================================== */

.certs-hero {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--border);
}

.certs-hero h1 {
  font-size: clamp(28px, 4vw, 42px);
  margin: 14px 0 12px;
}

.certs-hero p {
  font-family: var(--font-body);
  color: var(--text-muted);
  max-width: 62ch;
  font-size: 16px;
}

/* Section index — a real table of contents, not decoration:
   it mirrors the exact section order below. */
.section-index {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.section-index a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--text-muted);
  padding: 10px 16px;
  border-right: 1px solid var(--border);
  transition: color var(--transition), background var(--transition);
}

.section-index a:last-child {
  border-right: none;
}

.section-index a:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.section-index a .idx {
  color: var(--accent-dim);
  margin-right: 6px;
}

/* --- Cert sections --- */

.cert-section {
  padding: 64px 0;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 80px;
}

.cert-section:last-of-type {
  border-bottom: none;
}

.cert-section-head {
  margin-bottom: 32px;
}

.cert-section-head h2 {
  font-size: clamp(22px, 3vw, 28px);
  margin-top: 12px;
  color: var(--text);
}

.cert-section-note {
  font-family: var(--font-body);
  color: var(--text-faint);
  font-size: 14px;
  margin-top: 6px;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.cert-empty {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-faint);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 24px;
  grid-column: 1 / -1;
}

.cert-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  text-align: left;
  padding: 0;
  color: inherit;
}

.cert-card:hover,
.cert-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 28px rgba(0, 209, 224, 0.12);
  outline: none;
}

.cert-card-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--bg-elevated-2);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.cert-card-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 10px;
}

.cert-card-name {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  padding: 14px 16px 16px;
  line-height: 1.4;
}

/* --- Loading / skeleton state --- */

.cert-skeleton {
  background: linear-gradient(90deg, var(--bg-elevated) 0%, var(--bg-elevated-2) 50%, var(--bg-elevated) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.6s infinite;
  border-radius: var(--radius);
  aspect-ratio: 4 / 3;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .cert-skeleton { animation: none; }
}

/* --- Modal --- */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(2, 8, 13, 0.82);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-elevated);
  border: 1px solid var(--accent-dim);
  border-radius: 4px;
  max-width: 480px;
  width: 100%;
  max-height: 86vh;
  overflow-y: auto;
  transform: scale(0.96) translateY(8px);
  transition: transform var(--transition);
}

.modal-overlay.open .modal-card {
  transform: scale(1) translateY(0);
}

.modal-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--bg-elevated-2);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.modal-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 20px;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(5, 19, 30, 0.8);
  border: 1px solid var(--border);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  line-height: 1;
  transition: color var(--transition), border-color var(--transition);
}

.modal-close:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.modal-body {
  padding: 24px;
}

.modal-body h3 {
  font-size: 18px;
  color: var(--text);
  margin-bottom: 4px;
}

.modal-section-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  display: block;
}

.modal-desc {
  font-family: var(--font-body);
  font-size: 14.5px;
  color: var(--text-muted);
  margin: 14px 0 22px;
  line-height: 1.65;
}

.modal-desc.empty {
  font-style: italic;
  color: var(--text-faint);
}