Engineering Sketch Aesthetic

- Pure white background, plenty of negative space
- Engineering drawing line style (delicate, precise)
- Handwritten title (dark gray)
- Engineering annotation style to display steps
- Light blue, light green, and light orange watercolor accents (high transparency)
- Modern feel similar to Apple/Tesla product design sketches
- Concise icons with step-by-step descriptions
- Clean, professional, and tech-savvy

-  纯白色背景，大量留白
- 工程图纸线条风格（细腻、精确）
- 手写体标题（深灰色）
- 工程标注方式展示步骤
- 淡蓝色、淡绿色、淡橙色水彩点缀（高透明度）
- 类似苹果/特斯拉产品设计手稿的现代感
- 简洁图标配合步骤说明
- 清爽、专业、科技感