prompt: a professional industrial design portfolio case study layout, 16:9 widescreen aspect ratio, pure hand-drawn sketch style, no 3d rendering, no glossy materials. the layout shows a clear design thinking and deduction logic. top section: exploratory rough sketches showing ergonomic studies of a futuristic neckband wearable device, white and blue color block annotations, floating lines, cross-sections, and form variations. middle section: a detailed orthographic sketch of the final design, emphasizing the soft organic curves, the blue silicone inner ring, the circular sensor/indicator, and the type-c charging port with a flap. bottom section: a "design evolution" timeline showing how the final concept naturally grows from the initial rough sketches. aesthetic reference: excellent industrial design student portfolio, behance product design case study, clean white paper background, blue and grey marker pen, fine black ink pen, light grey construction lines, handwritten annotations, technical callouts, arrows, dynamic layout. high quality, crisp lines, professional sketching vibe, no shadows, no realistic lighting.