.catalog {
  background: var(--paper);
  color: var(--ink-900);
  position: relative;
}

.catalog-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

@media (min-width: 760px) {
  .catalog-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }
}

.catalog-head h2 {
  font-size: var(--fs-display-lg);
  max-width: 620px;
}

.catalog-lead {
  margin-top: var(--space-4);
  max-width: 560px;
  color: var(--ink-600);
  font-size: var(--fs-body-lg);
  line-height: var(--lh-relaxed);
}

.catalog-filters {
  display: inline-flex;
  gap: var(--space-1);
  padding: var(--space-1);
  background: var(--ink-100);
  border-radius: var(--radius-full);
}

.catalog-filter {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--fs-body-sm);
  font-weight: 500;
  color: var(--ink-600);
  transition:
    background var(--dur-fast) var(--ease-out-quart),
    color var(--dur-fast) var(--ease-out-quart);
}

.catalog-filter[aria-pressed="true"] {
  background: var(--pure);
  color: var(--violet-700);
  box-shadow: var(--shadow-sm);
}

.catalog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 680px) {
  .catalog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1040px) {
  .catalog-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.course-card {
  position: relative;
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  background: var(--pure);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  overflow: hidden;
  isolation: isolate;
  transition:
    transform var(--dur-base) var(--ease-out-quart),
    box-shadow var(--dur-base) var(--ease-out-quart),
    border-color var(--dur-base) var(--ease-out-quart);
}

/* O filtro esconde com [hidden], que o display:flex do card sobrescreveria. */
.course-card[hidden] {
  display: none;
}

.course-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--grad-signature);
  padding: 1px;
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out-quart);
  z-index: 1;
  pointer-events: none;
}

.course-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.course-card:hover::before {
  opacity: 1;
}

.course-card-thumb {
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  background: var(--grad-signature);
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  color: var(--paper);
}

.course-card-thumb::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.3) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(0, 0, 0, 0.2) 0%, transparent 50%);
}

/* Com foto de capa a vinheta do ::before continua por cima, dando a mesma
   profundidade que o gradiente tem sem foto. */
.course-card-thumb-img {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-smooth) var(--ease-spring-soft);
}

.course-card:hover .course-card-thumb-img {
  transform: scale(1.04);
}

.course-card-thumb-icon {
  width: 72px;
  height: 72px;
  position: relative;
  z-index: 1;
  opacity: 0.95;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.2));
  transition: transform var(--dur-smooth) var(--ease-spring-soft);
}

.course-card:hover .course-card-thumb-icon {
  transform: scale(1.05) rotate(-3deg);
}

.course-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.course-card-title {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 600;
  line-height: var(--lh-snug);
  letter-spacing: var(--ls-snug);
  color: var(--ink-900);
  overflow-wrap: anywhere;
  hyphens: auto;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card-desc {
  color: var(--ink-600);
  font-size: var(--fs-body-sm);
  line-height: var(--lh-relaxed);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-width: 0;
}

.course-card-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: var(--fs-mono-sm);
}

.course-card-meta dt {
  font-size: 0.6875rem;
  color: var(--ink-400);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  margin-bottom: 2px;
  font-family: var(--font-body);
}

.course-card-meta dd {
  color: var(--ink-900);
  font-weight: 500;
}

.course-card-cta {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--ink-950);
  color: var(--paper);
  font-size: var(--fs-body-sm);
  font-weight: 500;
  transition:
    background var(--dur-fast) var(--ease-out-quart),
    transform var(--dur-base) var(--ease-spring-soft);
}

.course-card-cta:hover {
  background: var(--violet-700);
  transform: translateY(-1px);
}

.course-card-cta .arrow {
  transition: transform var(--dur-base) var(--ease-spring-soft);
}

.course-card-cta:hover .arrow {
  transform: translateX(4px);
}

.course-card-cta.is-disabled,
.course-card-cta.is-disabled:hover {
  background: transparent;
  border: 1px dashed var(--color-border);
  color: var(--ink-400);
  cursor: not-allowed;
  font-style: italic;
  justify-content: center;
  transform: none;
}

.theme-light .course-card-cta.is-disabled {
  color: var(--ink-500);
}

.catalog-empty {
  padding: var(--space-16) var(--space-8);
  text-align: center;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--ink-500);
  grid-column: 1 / -1;
}