/* ============================================================
   Product Card v3.0 - 移动端滑动动画增强
   ============================================================ */
.product-card {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.5s var(--ease-out-quart);
  position: relative;
  border: 1px solid var(--color-border-light);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.product-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 24px 56px rgba(0, 0, 0, 0.1);
  border-color: rgba(37, 99, 235, 0.18);
}

.product-card:active {
  transform: translateY(-3px) scale(0.975);
  transition: all 0.15s var(--ease-out-quart);
}

.product-card__badge {
  position: absolute;
  top: 16px; right: 16px;
  z-index: 2;
  padding: 5px 16px;
  font-size: 0.7rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #dc2626, #ef4444);
  border-radius: var(--radius-full);
  letter-spacing: 1px;
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

.product-card__image-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-off-white), #fafafa);
}

.product-card__image {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.8s var(--ease-out-expo);
}

.product-card:hover .product-card__image { transform: scale(1.12); }

.product-card__image-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f8f9fa, #eef0f4);
  color: var(--text-tertiary);
  transition: background 0.4s ease;
}

.product-card:hover .product-card__image-placeholder {
  background: linear-gradient(135deg, #f0f2f6, #e2e6ed);
}

.product-card__info {
  padding: 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-card__category {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 10px;
}

.product-card__name {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.35;
  letter-spacing: -0.012em;
}

.product-card__specs {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-bottom: 16px;
  line-height: 1.65;
  font-weight: 350;
}

.product-card__features {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 20px;
  flex: 1;
}

.product-card__features li {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
  font-weight: 350;
  line-height: 1.6;
}

.product-card__features li::before {
  content: '';
  position: absolute;
  left: 0; top: 10px;
  width: 5px; height: 5px;
  background: var(--color-accent);
  border-radius: 50%;
  opacity: 0.55;
}

.product-card__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-accent);
  transition: gap 0.35s ease, color 0.35s ease;
  letter-spacing: 0.3px;
  text-decoration: none;
}

.product-card:hover .product-card__link {
  gap: 12px;
  color: #1d4ed8;
}

.product-card__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 4px;
}

.product-card__buy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.2s ease, transform 0.15s ease;
  white-space: nowrap;
}

.product-card__buy-btn:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
}

.product-card__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

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

@media (max-width: 1024px) {
  .product-card__grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .product-card__grid--3 { grid-template-columns: repeat(2, 1fr); }
}

/* 移动端：hover 转为点击反馈 */
@media (hover: none) and (pointer: coarse) {
  .product-card:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--color-border-light);
  }
  .product-card:active {
    transform: scale(0.98);
  }
  .product-card:hover .product-card__image { transform: none; }
}

@media (max-width: 640px) {
  .product-card__grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .product-card__grid--3 { grid-template-columns: 1fr; }
  .product-card__info { padding: 20px; }
  .product-card__name { font-size: 0.95rem; }
  .product-card__badge { top: 12px; right: 12px; padding: 4px 12px; font-size: 0.65rem; }
  .product-card__buy-btn { padding: 8px 16px; min-height: 36px; }
  .product-card__features li { font-size: 0.85rem; }
}