// 备选方案：美观的卡片式布局样式
.materials-section.alternative-layout {
  // 文本输入区域 - 独立一行
  .text-upload-section {
    margin-bottom: 2rem;
    
    .upload-item.text-item {
      background: white;
      border: 1px solid #e5e5e7;
      border-radius: 12px;
      padding: 1.5rem;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
      
      h5 {
        margin: 0 0 1rem 0;
        font-size: 1rem;
        font-weight: 600;
        color: #1d1d1f;
        display: flex;
        align-items: center;
        gap: 0.5rem;
        
        &::before {
          content: "📝";
          font-size: 1.2rem;
        }
      }
      
      textarea {
        width: 100%;
        padding: 1rem;
        border: 1px solid #d2d2d7;
        border-radius: 8px;
        font-size: 0.9rem;
        resize: vertical;
        margin-bottom: 1rem;
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        line-height: 1.5;
        
        &:focus {
          outline: none;
          border-color: #007aff;
          box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
        }
        
        &::placeholder {
          color: #86868b;
        }
      }
      
      .btn-primary {
        background: linear-gradient(135deg, #007aff 0%, #0051d5 100%);
        border: none;
        border-radius: 8px;
        padding: 0.75rem 1.5rem;
        color: white;
        font-weight: 500;
        font-size: 0.9rem;
        cursor: pointer;
        transition: all 0.2s ease;
        
        &:hover:not(:disabled) {
          transform: translateY(-1px);
          box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
        }
        
        &:disabled {
          opacity: 0.5;
          cursor: not-allowed;
        }
      }
    }
  }

  // 参考图片和CAD图纸 - 美观卡片式并排布局
  .file-upload-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    
    // 移动端响应式
    @media (max-width: 768px) {
      grid-template-columns: 1fr;
      gap: 1rem;
    }
    
    .upload-card {
      background: white;
      border: 1px solid #e5e5e7;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
      transition: all 0.3s ease;
      
      &:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
      }
      
      .card-header {
        padding: 1.25rem 1.5rem 1rem 1.5rem;
        border-bottom: 1px solid #f2f2f7;
        display: flex;
        align-items: center;
        gap: 0.75rem;
        
        .card-icon {
          width: 40px;
          height: 40px;
          border-radius: 10px;
          display: flex;
          align-items: center;
          justify-content: center;
          
          &.image-icon {
            background: linear-gradient(135deg, #ff9500 0%, #ff6b00 100%);
            color: white;
          }
          
          &.cad-icon {
            background: linear-gradient(135deg, #007aff 0%, #0051d5 100%);
            color: white;
          }
        }
        
        h5 {
          margin: 0;
          font-size: 1.1rem;
          font-weight: 600;
          color: #1d1d1f;
        }
      }
      
      .card-body {
        padding: 1.5rem;
        
        .file-upload-zone {
          border: 2px dashed #d2d2d7;
          border-radius: 12px;
          padding: 2rem 1rem;
          text-align: center;
          cursor: pointer;
          transition: all 0.3s ease;
          background: #fafafa;
          min-height: 140px;
          display: flex;
          align-items: center;
          justify-content: center;
          
          &:hover {
            border-color: #007aff;
            background: rgba(0, 122, 255, 0.02);
            transform: scale(1.02);
          }
          
          .upload-content {
            .upload-icon {
              margin-bottom: 1rem;
              
              svg {
                color: #86868b;
                transition: color 0.2s ease;
              }
            }
            
            p {
              margin: 0 0 0.5rem 0;
              font-size: 1rem;
              color: #1d1d1f;
              font-weight: 500;
            }
            
            .hint {
              font-size: 0.85rem;
              color: #86868b;
              line-height: 1.4;
            }
          }
          
          &:hover .upload-content {
            .upload-icon svg {
              color: #007aff;
            }
          }
        }
      }
      
      // 特定卡片样式
      &.image-card {
        .file-upload-zone:hover {
          border-color: #ff9500;
          background: rgba(255, 149, 0, 0.02);
          
          .upload-content .upload-icon svg {
            color: #ff9500;
          }
        }
      }
      
      &.cad-card {
        .file-upload-zone:hover {
          border-color: #007aff;
          background: rgba(0, 122, 255, 0.02);
          
          .upload-content .upload-icon svg {
            color: #007aff;
          }
        }
      }
    }
  }
}

// 深色模式支持
@media (prefers-color-scheme: dark) {
  .materials-section.alternative-layout {
    .text-upload-section .upload-item.text-item,
    .file-upload-cards .upload-card {
      background: #1c1c1e;
      border-color: #38383a;
      
      h5 {
        color: #f2f2f7;
      }
      
      textarea {
        background: #2c2c2e;
        border-color: #48484a;
        color: #f2f2f7;
        
        &::placeholder {
          color: #8e8e93;
        }
      }
      
      .file-upload-zone {
        background: #2c2c2e;
        border-color: #48484a;
        
        .upload-content {
          p {
            color: #f2f2f7;
          }
          
          .hint {
            color: #8e8e93;
          }
          
          .upload-icon svg {
            color: #8e8e93;
          }
        }
      }
    }
  }
}