/* ===================================
   certificates.css — Achievements Page
   =================================== */

/* Page Hero */
.page-hero {
  padding-block: var(--space-16) var(--space-10);
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
}
.page-hero__inner { max-width: 680px; }

/* Category icon */
.cat-icon { margin-right: var(--space-2); }

/* Certificate grid */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
}

/* Cert card */
.cert-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
  cursor: pointer;
  outline: none;
}
.cert-card:hover,
.cert-card:focus-visible {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-accent-medium);
}
.cert-card:focus-visible {
  box-shadow: 0 0 0 3px var(--color-accent);
}

/* Placeholder image */
.cert-card__image-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-accent-light) 100%);
  font-size: 2.2rem;
  transition: background var(--transition-base);
}
.cert-card:hover .cert-card__image-placeholder {
  background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-accent-medium) 100%);
}
.cert-card__image-placeholder span:last-child {
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-accent);
  opacity: 0.7;
}

/* Real image */
.cert-card__image {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
}

/* Card body */
.cert-card__body {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.cert-card__title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  line-height: var(--leading-snug);
}
.cert-card__year {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  font-weight: var(--font-medium);
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
}
.lightbox.open { display: flex; }

.lightbox__inner {
  position: relative;
  max-width: 700px;
  width: 100%;
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  animation: zoomIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes zoomIn {
  from { opacity: 0; transform: scale(0.88); }
  to { opacity: 1; transform: scale(1); }
}

.lightbox__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 34px; height: 34px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.25);
  color: #fff;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.lightbox__close:hover { background: rgba(0,0,0,0.55); transform: scale(1.1); }

.lightbox__image {
  width: 100%;
  display: block;
}

.lightbox__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-16);
  text-align: center;
}
.lightbox__ph-icon { font-size: 3rem; }
.lightbox__ph-text {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
}
.lightbox__ph-sub {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  max-width: 36ch;
}

/* Responsive */
@media (max-width: 1100px) {
  .cert-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .cert-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
}
@media (max-width: 480px) {
  .cert-grid { grid-template-columns: 1fr; }
}