.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 24px 0 32px;
}

.certificates-empty {
  margin: 24px 0;
  color: color-mix(in srgb, var(--fg) 65%, transparent);
  font-size: 14px;
}

.certificates-intro {
  margin-top: 2rem;
}

.cert-card {
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border: 1px solid var(--table-border-color);
  border-radius: 8px;
  overflow: hidden;
  backdrop-filter: blur(8px);
  transition: border-color 0.2s, background 0.2s, transform 0.2s, box-shadow 0.2s;
}

.cert-card-open {
  display: flex;
  flex-direction: column;
  flex: 1;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.cert-card-open:disabled {
  cursor: default;
}

.cert-card-open:not(:disabled):hover,
.cert-card:has(.cert-card-open:not(:disabled):hover) {
  border-color: color-mix(in srgb, var(--card-hover-border) 50%, transparent);
  background: color-mix(in srgb, var(--red) 5%, var(--card-bg));
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.2), 0 0 20px var(--particle-glow-soft);
  transform: translateY(-1px);
}

.cert-card-thumb {
  line-height: 0;
  border-bottom: 1px solid var(--table-border-color);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
}

.cert-card-thumb img {
  display: block;
  width: 100%;
  height: 180px;
  object-fit: cover;
  object-position: top center;
}

.cert-card-body {
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.cert-card-title {
  margin: 0;
  font-size: 15px;
  line-height: 1.35;
  color: var(--links);
  font-weight: 600;
}

.cert-card-meta {
  margin: 0;
  font-size: 13px;
  color: color-mix(in srgb, var(--fg) 58%, transparent);
}

.cert-card-sep {
  margin: 0 6px;
  opacity: 0.6;
}

.cert-card-tags {
  margin-top: auto;
  padding-top: 4px;
}

.cert-card-hint {
  margin-top: 8px;
  font-size: 11px;
  font-family: var(--mono-font);
  color: color-mix(in srgb, var(--fg) 45%, transparent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

body.cert-lightbox-open {
  overflow: hidden;
}

.cert-lightbox[hidden] {
  display: none !important;
}

.cert-lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.cert-lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, #000 72%, transparent);
  backdrop-filter: blur(3px);
}

.cert-lightbox-dialog {
  position: relative;
  z-index: 1;
  width: min(920px, 100%);
  max-height: min(92vh, 900px);
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border: 1px solid var(--table-border-color);
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  overflow: hidden;
}

.cert-lightbox-close {
  position: absolute;
  top: 10px;
  right: 12px;
  z-index: 2;
  width: 36px;
  height: 36px;
  border: 1px solid var(--table-border-color);
  border-radius: 8px;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  color: var(--fg);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.cert-lightbox-title {
  margin: 0;
  padding: 16px 52px 12px 18px;
  font-size: 1rem;
  border-bottom: 1px solid var(--table-border-color);
}

.cert-lightbox-body {
  overflow: auto;
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  -webkit-overflow-scrolling: touch;
}

.cert-lightbox-img {
  display: block;
  max-width: 100%;
  max-height: min(72vh, 760px);
  width: auto;
  height: auto;
  border-radius: 8px;
}

.cert-lightbox-frame {
  display: block;
  width: 100%;
  min-height: min(72vh, 760px);
  height: min(72vh, 760px);
  border: 0;
  border-radius: 8px;
  background: #fff;
}

.cert-lightbox-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  padding: 10px 14px 14px;
  border-top: 1px solid var(--table-border-color);
}

.cert-lightbox-action {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--table-border-color);
  color: var(--menu-bar-link-color);
  font-size: 12px;
  font-family: var(--mono-font);
  text-decoration: none;
}

.cert-lightbox-action:hover {
  color: var(--menu-bar-link-color-hover);
  border-color: color-mix(in srgb, var(--links) 35%, transparent);
  text-decoration: none;
}

@media (max-width: 640px) {
  .certificates-grid {
    grid-template-columns: 1fr;
  }
}