.cert-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 36px;
}

.cert-tab {
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  background: rgba(255, 255, 255, 0.055);
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 900;
  transition: transform var(--ease), border-color var(--ease), background var(--ease), color var(--ease);
}

.cert-tab:hover,
.cert-tab.active {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--issuer-color), white 16%);
  background: color-mix(in srgb, var(--issuer-color), transparent 80%);
  color: var(--text-primary);
}

.cert-container {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.cert-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--surface-strong);
  box-shadow: var(--shadow-sm);
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.cert-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--issuer-color), white 14%);
  box-shadow: var(--shadow-md);
}

.cert-card.hidden {
  display: none;
}

.cert-issuer-bar {
  position: relative;
  min-height: 54px;
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
  padding: 12px 16px;
  background: var(--issuer-color);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 900;
}

.cert-issuer-bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 0%, rgba(255, 255, 255, 0.28) 45%, transparent 72%);
  transform: translateX(-120%);
}

.cert-card:hover .cert-issuer-bar::after {
  animation: issuerShine 900ms ease;
}

@keyframes issuerShine {
  to { transform: translateX(120%); }
}

.cert-issuer-icon {
  width: 30px;
  height: 30px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}

.cert-preview {
  position: relative;
  height: 190px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--issuer-color), transparent 72%), rgba(255, 255, 255, 0.045)),
    repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.06) 0 1px, transparent 1px 12px);
}

.cert-preview::before {
  content: "";
  position: absolute;
  inset: 18px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-card);
  pointer-events: none;
}

.cert-preview img,
.cert-preview canvas {
  position: relative;
  z-index: 1;
  width: min(82%, 300px);
  max-height: 160px;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  box-shadow: 0 14px 30px rgba(2, 6, 23, 0.26);
}

.pdf-preview canvas {
  opacity: 0;
}

.pdf-preview.loaded canvas {
  opacity: 1;
}

.image-preview img {
  height: 152px;
}

.cert-spinner {
  position: absolute;
  z-index: 2;
  width: 34px;
  height: 34px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

.pdf-preview.loaded .cert-spinner {
  display: none;
}

.cert-fallback {
  position: relative;
  z-index: 1;
  width: min(82%, 300px);
  min-height: 136px;
  display: grid;
  place-items: center;
  gap: 8px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-card);
  background: linear-gradient(135deg, color-mix(in srgb, var(--issuer-color), white 6%), rgba(15, 23, 42, 0.88));
  color: #fff;
  text-align: center;
  font-weight: 900;
}

.cert-fallback i {
  font-size: 2rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.cert-info {
  padding: 18px;
}

.cert-info h3 {
  display: -webkit-box;
  min-height: 3rem;
  overflow: hidden;
  color: var(--text-primary);
  font-family: "Syne", sans-serif;
  font-size: 1.05rem;
  line-height: 1.35;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.cert-info p {
  margin-top: 9px;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.cert-info p span {
  float: right;
  color: color-mix(in srgb, var(--issuer-color), white 18%);
  font-weight: 900;
}

.cert-view {
  min-height: 42px;
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
  padding: 10px 14px;
  border-radius: var(--radius-control);
  background: color-mix(in srgb, var(--issuer-color), white 8%);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 900;
  transition: transform var(--ease), filter var(--ease);
}

.cert-view:hover {
  transform: translateY(-2px);
  filter: brightness(1.12);
}

.certificate-modal {
  position: fixed;
  inset: 0;
  z-index: 2200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(2, 6, 23, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.certificate-modal.open {
  display: flex;
}

.modal-dialog {
  width: min(1040px, 100%);
  max-height: min(92vh, 900px);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--bg-dark);
  box-shadow: var(--shadow-md);
}

.modal-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.modal-title {
  color: var(--text-primary);
  font-family: "Syne", sans-serif;
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  line-height: 1.25;
}

.modal-issuer {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.modal-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn,
.download-certificate {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  transition: transform var(--ease), background var(--ease), color var(--ease);
}

.download-certificate {
  width: auto;
  min-width: 44px;
  padding: 0 12px;
  border-radius: var(--radius-control);
}

.icon-btn:hover,
.download-certificate:hover {
  transform: translateY(-2px);
  background: var(--secondary);
  color: #020617;
}

.certificate-viewer {
  --zoom: 1;
  min-height: 0;
  display: grid;
  place-items: center;
  overflow: auto;
  padding: 18px;
  background: #020617;
}

.certificate-document {
  width: min(100%, 900px);
  height: min(72vh, 720px);
  border: 0;
  border-radius: var(--radius-card);
  background: #fff;
  object-fit: contain;
  transform: scale(var(--zoom));
  transform-origin: center top;
  transition: transform var(--ease);
}

img.certificate-document {
  width: auto;
  max-width: min(100%, 900px);
  height: auto;
  max-height: 76vh;
}