.card-atividade {
  background-color: var(--bg-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: var(--transition-base);
  height: 100%;
  min-height: 460px;
  display: flex;
  flex-direction: column;
  position: relative;
  border: 1px solid var(--border-primary, #757575);
}

.card-atividade:hover .card-imagem::before,
.card-atividade:focus-within .card-imagem::before {
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.05), rgba(0, 0, 0, 0.25));
}

.card-atividade:hover .card-titulo a,
.card-atividade:focus-within .card-titulo a {
  color: var(--color-primary);
}

.card-imagem {
  height: 180px;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  position: relative;
  cursor: pointer;
  overflow: hidden;
  flex: 0 0 auto;
}

.card-imagem::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.02), rgba(0, 0, 0, 0.2));
  z-index: 1;
  transition: var(--transition-base);
}

.card-conteudo {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  gap: var(--spacing-sm);
  min-height: 0;
}

.card-titulo {
  font-size: var(--font-size-base);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-dark);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  margin: 0;
  letter-spacing: 0;
}

.card-titulo a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-base);
}

.card-descricao {
  font-size: var(--font-size-sm);
  line-height: 1.5;
  color: var(--text-secondary);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  min-height: calc(2em * 1.5);
  max-height: calc(2em * 1.5);
  flex: initial;
}

.card-botao {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: auto;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-xl);
  background-color: var(--color-primary);
  color: var(--text-white);
  font-weight: 600;
  font-size: var(--font-size-sm);
  letter-spacing: 0.5px;
  text-decoration: none;
  transition: var(--transition-base);
  text-align: center;
  gap: var(--spacing-sm);
  box-shadow: 0 4px 12px rgba(58, 51, 255, 0.2);
}

.card-botao:hover,
.card-botao:focus {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(68, 51, 255, 0.25);
  color: var(--text-white);
}

.activity-card-tags ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  max-height: 102px;
  overflow: hidden;
  margin: 0;
  padding: 0;
  list-style: none;
}

.activity-card-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  padding: 4.8px 12px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.2;
  max-width: 100%;
  min-height: 28px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.activity-card-tag-subject {
  background: #ffffff;
  color: #333333;
  border: 1px solid #757575;
}

.activity-card-tag-curriculum {
  background: rgba(52, 170, 223, 0.1);
  color: var(--color-info);
  border: 1px solid rgba(52, 170, 223, 0.2);
}

.activity-card-tag-series.serie1 { background: #F5F2FF; color: #4A2C96; border: 1px solid #D1C4E9; }
.activity-card-tag-series.serie2 { background: #E8F0FF; color: #1A3A8C; border: 1px solid #BBDEFB; }
.activity-card-tag-series.serie3 { background: #E8F7FF; color: #1A5A7A; border: 1px solid #B3E5FC; }
.activity-card-tag-series.serie4 { background: #E8FDF8; color: #1A6B5A; border: 1px solid #B2DFDB; }
.activity-card-tag-series.serie5 { background: #E8F5EA; color: #2D5A2D; border: 1px solid #C8E6C9; }
.activity-card-tag-series.serie6 { background: #F5FCE8; color: #5A6B1A; border: 1px solid #DCEDC8; }
.activity-card-tag-series.serie7 { background: #FEFCE8; color: #8C6B1A; border: 1px solid #FFF9C4; }
.activity-card-tag-series.serie8 { background: #FEF5E8; color: #B85A1A; border: 1px solid #FFE0B2; }
.activity-card-tag-series.serie9 { background: #F5E8E8; color: #6B2D2D; border: 1px solid #FFCDD2; }
.activity-card-tag-series.serie10 { background: #FFE8E8; color: #B82D2D; border: 1px solid #FFCDD2; }
.activity-card-tag-series.serie11 { background: #F8E8F5; color: #8C2D6B; border: 1px solid #F8BBD9; }
.activity-card-tag-series.serie12 { background: #F0E8FF; color: #4A1A8C; border: 1px solid #D1C4E9; }
.activity-card-tag-series.serie13 { background: #FFE8E8; color: #B82D2D; border: 1px solid #FFCDD2; }

@media (max-width: 992px) {
  .card-imagem {
    height: 160px;
  }
}

@media (max-width: 576px) {
  .card-titulo {
    font-size: var(--font-size-base);
  }

  .card-botao {
    width: 100%;
    padding: 0.7rem 1rem;
  }
}