/* ============================================
   Stats Cards Section - 现代化统计卡片样式
   设计特点：毛玻璃卡片 + 图标 + 微妙动画
   ============================================ */

.stats-cards-section {
  position: relative;
  padding: 2.5rem 0;
  background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
  overflow: hidden;
}

.stats-cards-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 71, 107, 0.2), transparent);
}

.stats-cards-container {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.stats-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.stats-card {
  position: relative;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(0, 71, 107, 0.08);
  border-radius: 1rem;
  padding: 1.5rem 1rem;
  text-align: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 
    0 1px 3px rgba(0, 0, 0, 0.05),
    0 4px 6px -1px rgba(0, 0, 0, 0.03);
}

.stats-card:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 1);
  border-color: rgba(0, 71, 107, 0.15);
  box-shadow: 
    0 10px 25px -5px rgba(0, 71, 107, 0.1),
    0 8px 10px -6px rgba(0, 71, 107, 0.06);
}

.stats-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--card-accent, #00476b), transparent);
  border-radius: 0 0 4px 4px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.stats-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  margin: 0 auto 0.75rem;
  background: linear-gradient(135deg, rgba(0, 71, 107, 0.08) 0%, rgba(0, 71, 107, 0.04) 100%);
  border-radius: 0.75rem;
  transition: all 0.3s ease;
}

.stats-card:hover .stats-card-icon {
  background: linear-gradient(135deg, rgba(0, 71, 107, 0.12) 0%, rgba(0, 71, 107, 0.06) 100%);
  transform: scale(1.05);
}

.stats-card-icon i {
  font-size: 1.125rem;
  color: var(--color-primary);
  transition: color 0.3s ease;
}

.stats-card:hover .stats-card-icon i {
  color: var(--color-primary-dark);
}

.stats-card-value {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.25rem;
  margin-bottom: 0.25rem;
}

.stats-card-number {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  letter-spacing: -0.02em;
}

.stats-card-unit {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1;
}

.stats-card-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: #64748b;
  line-height: 1.4;
  letter-spacing: 0.01em;
}

.stats-card-shine {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.4) 0%,
    transparent 50%
  );
  border-radius: 1.25rem;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.stats-card:hover .stats-card-shine {
  opacity: 1;
}

@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.stats-card {
  animation: cardFadeIn 0.5s ease-out forwards;
  opacity: 0;
}

.stats-card:nth-child(1) { animation-delay: 0.1s; }
.stats-card:nth-child(2) { animation-delay: 0.2s; }
.stats-card:nth-child(3) { animation-delay: 0.3s; }
.stats-card:nth-child(4) { animation-delay: 0.4s; }

@media (max-width: 1024px) {
  .stats-cards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .stats-card {
    padding: 1.25rem 0.75rem;
  }

  .stats-card-number {
    font-size: 1.5rem;
  }

  .stats-card-unit {
    font-size: 1rem;
  }
}

@media (max-width: 640px) {
  .stats-cards-section {
    padding: 2rem 0;
  }

  .stats-cards-container {
    padding: 0 0.75rem;
  }

  .stats-cards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .stats-card {
    padding: 1rem 0.75rem;
    border-radius: 0.75rem;
  }

  .stats-card-icon {
    width: 2.5rem;
    height: 2.5rem;
    margin-bottom: 0.5rem;
  }

  .stats-card-icon i {
    font-size: 1rem;
  }

  .stats-card-number {
    font-size: 1.375rem;
  }

  .stats-card-unit {
    font-size: 0.875rem;
  }

  .stats-card-label {
    font-size: 0.65rem;
  }
}

@media (max-width: 400px) {
  .stats-card {
    padding: 0.875rem 0.5rem;
  }

  .stats-card-icon {
    width: 2rem;
    height: 2rem;
    border-radius: 0.5rem;
  }

  .stats-card-icon i {
    font-size: 0.875rem;
  }

  .stats-card-number {
    font-size: 1.25rem;
  }

  .stats-card-unit {
    font-size: 0.75rem;
  }

  .stats-card-label {
    font-size: 0.6rem;
  }
}