Software engineering diagram, architectural design PDF document, A4 size, white background, black lines, UML notation, class diagrams, sequence diagrams, component diagrams, deployment diagrams, use case diagrams, activity diagrams, state machine diagrams, colorful icons, 3D visual effects, subtle shadow, detailed annotations, clean layout, modern sans-serif font, precise grid system, professional tone, technical atmosphere, office desk, coffee cup, keyboard, mouse, laptop, indoor lighting, morning sunlight, panoramic view, slight blur effect.