.certification {
  padding-top: 40px;
}

.cert-intro {
  font-size: 15px;
  line-height: 1.7;
  color: color-mix(in srgb, var(--default-color), transparent 20%);
  max-width: 100%;
  margin: 0 0 30px 0;
}

.cert-filters {
  display: flex;
  gap: 25px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.cert-filter-btn {
  background: none;
  border: none;
  color: color-mix(in srgb, var(--default-color), transparent 40%);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  padding: 4px 0;
  transition: 0.3s;
}

.cert-filter-btn:hover {
  color: var(--contrast-color);
}

.cert-filter-btn.active {
  color: var(--accent-color);
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.cert-item {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: 8px;
  cursor: pointer;
}

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

.cert-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: 0.4s;
  display: block;
}

.cert-item:hover img {
  transform: scale(1.08);
}

.cert-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent-color);
  color: black;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  z-index: 2;
}

.cert-caption {
  position: absolute;
  inset: auto 0 0 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  padding: 30px 16px 14px;
  opacity: 0;
  transform: translateY(10px);
  transition: 0.3s;
  z-index: 2;
}

.cert-caption p {
  margin: 0;
  font-size: 14px;
  color: var(--contrast-color);
}

.cert-item:hover .cert-caption {
  opacity: 1;
  transform: translateY(0);
}

.cert-lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}

.cert-lightbox.cert-active {
  display: flex;
}

.cert-lightbox-content {
  max-width: 900px;
  width: 92vw;
  max-height: 92vh;
  overflow: hidden;
  background: var(--background-color);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
}

.cert-lightbox-img-wrap {
  overflow: hidden;
  position: relative;
  max-height: 65vh;
}

.cert-lightbox-content img {
  width: 100%;
  max-height: 65vh;
  object-fit: contain;
  border-radius: 12px 12px 0 0;
  cursor: zoom-in;
  transition: transform 0.4s ease;
  -webkit-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
  -webkit-touch-callout: none;
  display: block;
}

.cert-lightbox-content img.cert-zoomed {
  transform: scale(2);
  cursor: zoom-out;
}

.cert-zoom-hint {
  position: absolute;
  bottom: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  background: color-mix(in srgb, var(--background-color), transparent 30%);
  border: 2px solid var(--accent-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-color);
  font-size: 16px;
  z-index: 3;
  pointer-events: none;
}

.cert-lightbox-info {
  padding: 24px;
}

.cert-lightbox-info h3 {
  margin: 0 0 8px 0;
  font-size: 20px;
  color: var(--contrast-color);
}

.cert-lightbox-info p {
  margin: 0 0 16px 0;
  font-size: 14px;
  line-height: 1.6;
  color: color-mix(in srgb, var(--default-color), transparent 25%);
}

.cert-lightbox-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.cert-lightbox-date {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cert-verify-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
  padding: 6px 14px;
  border-radius: 20px;
  transition: 0.3s;
}

.cert-verify-link:hover {
  background: var(--accent-color);
  color: black;
}

.cert-verify-link.cert-verify-hidden {
  display: none;
}

.cert-lightbox-close {
  position: absolute;
  top: 25px;
  right: 35px;
  color: var(--contrast-color);
  font-size: 36px;
  font-weight: 300;
  cursor: pointer;
  z-index: 10000;
}

.cert-lightbox-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--contrast-color);
  font-size: 48px;
  cursor: pointer;
  z-index: 10000;
  padding: 10px 20px;
}

.cert-lightbox-prev { left: 10px; }
.cert-lightbox-next { right: 10px; }

@media (max-width: 992px) {
  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .certification {
    padding-top: 20px;
    padding-left: 15px;
    padding-right: 15px;
  }

  .section-title {
    font-size: 24px;
  }

  .cert-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .cert-filters {
    gap: 16px;
  }

  .cert-filter-btn {
    font-size: 12px;
  }

  .cert-lightbox-arrow {
    font-size: 32px;
    padding: 6px 12px;
  }
}