/* ==============================================
   COMPONENT: Patent Grid
   Description: Filterable grid of patent cards on patents.html
   ============================================== */

/* --- Block --- */

.patent-grid {
  padding-block: var(--space-12);
  background: var(--color-clinical-white);
}

/* --- Filter bar --- */

.patent-grid__filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-8);
  margin-bottom: var(--space-8);
}

.patent-grid__filter {
  font-family: var(--font-family-base);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-border);
  background: var(--color-clinical-white);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.patent-grid__filter:hover {
  border-color: var(--color-innovation-blue);
  color: var(--color-innovation-blue);
}

.patent-grid__filter.is-active {
  border-color: var(--color-innovation-blue);
  background: var(--color-innovation-blue);
  color: var(--color-clinical-white);
}

/* --- Cards grid --- */

.patent-grid__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

/* --- Individual patent card --- */

.patent-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  background: var(--color-bg-section);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.patent-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Hidden state for JS filtering */
.patent-card[hidden] {
  display: none;
}

/* --- Card header --- */

.patent-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* --- Status badge --- */

.patent-card__status {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

.patent-card__status--in-patent {
  background: var(--color-blue-light);
  color: var(--color-innovation-blue);
}

.patent-card__status--us-patent {
  background: var(--color-green-light-tint);
  color: var(--color-synthesis-green);
}

/* --- Company label --- */

.patent-card__company {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
}

/* --- Title --- */

.patent-card__title {
  font-size: var(--text-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 1.4;
}

/* --- Description --- */

.patent-card__description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* --- Tags --- */

.patent-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.patent-card__tag {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-clinical-white);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

/* --- Inventors & specs --- */

.patent-card__inventors {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  font-style: italic;
  line-height: 1.5;
}

.patent-card__specs {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-synthesis-green);
}

/* --- Responsive --- */

@media (min-width: 768px) {
  .patent-grid {
    padding-block: var(--space-16);
  }

  .patent-grid__cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .patent-grid {
    padding-block: var(--space-20);
  }

  .patent-grid__cards {
    grid-template-columns: repeat(3, 1fr);
  }
}