.about-certs {
  background: var(--color-gray-50);
  padding: var(--section-padding) 0;
  position: relative;
}

.about-certs__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.about-certs__header {
  margin-bottom: 56px;
  max-width: 720px;
}

.about-certs__subtitle {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-gray-500);
  margin: 0;
}

/* --- Grid --- */
.about-certs__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  border-left: 1px solid rgba(0, 0, 0, 0.1);
}

.about-certs__card {
  position: relative;
  min-width: 0;
  background: var(--color-white);
  padding: 40px 28px 36px;
  border-right: 1px solid rgba(0, 0, 0, 0.1);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
  gap: 20px;
  cursor: default;
  color: inherit;
  text-decoration: none;
  transition: background 0.3s ease, transform 0.3s ease;
}

a.about-certs__card {
  cursor: pointer;
}

/* Red bar left */
.about-certs__card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--color-accent);
  transition: width 0.3s ease;
}

.about-certs__card:hover::before { width: 6px; }

/* Corner bracket top-right on hover */
.about-certs__card::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 32px;
  height: 32px;
  border-top: 2px solid var(--color-accent);
  border-right: 2px solid var(--color-accent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.about-certs__card:hover::after { opacity: 1; }

.about-certs__card:hover {
  background: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
  z-index: 2;
}

/* Icon — plain, no circle */
.about-certs__card-icon {
  color: var(--color-dark);
  width: 36px;
  height: 36px;
  display: block;
}

.about-certs__card:hover .about-certs__card-icon {
  color: var(--color-accent);
}

.about-certs__card-index {
  font-family: var(--font-heading);
  font-size: 11px;
  color: var(--color-gray-400);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.about-certs__card-name {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.35;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-top: auto;
  overflow-wrap: anywhere;
}

/* Animate */
.about-certs__animate {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.about-certs__animate--visible {
  opacity: 1;
  transform: translateY(0);
}
.about-certs__card.about-certs__animate:nth-child(2) { transition-delay: 0.08s; }
.about-certs__card.about-certs__animate:nth-child(3) { transition-delay: 0.16s; }
.about-certs__card.about-certs__animate:nth-child(4) { transition-delay: 0.24s; }

@media (max-width: 900px) {
  .about-certs__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 600px) {
  .about-certs { padding: var(--section-padding-sm) 0; }
  .about-certs__container { padding: 0 var(--container-padding-mobile); }
  .about-certs__card { padding: 28px 20px; }
  .about-certs__header { margin-bottom: 36px; }
}