皮筋捆西瓜实验：可挤压、会爆开的 3D 浏览器小玩具

Build a small browser toy that recreates the rubber-band watermelon test. Show a glossy striped watermelon centered on a warm off-white background with a soft ground shadow and a minimal editorial title in the corner. Each click or tap on the melon adds another rubber band around its middle. The bands tighten, the melon visibly squeezes into an hourglass shape and wobbles, and a small counter and a line of captions escalate the tension. After enough bands it bursts: red flesh chunks, rind wedges, seeds and rubber bands scatter across the floor, and a large italic caption appears with a restart button. Use real-time 3D rendering with soft studio lighting, deformable geometry and a particle burst. Deliver one self-contained HTML file. Done means adding bands is satisfying and the burst reads clearly.