I'm a product design student. I'm not familiar with the terminal or writing code. Please build this for me with HTML, CSS, JavaScript and native Web Audio. Make a simple, usable browser page, with no external libraries or internet services. Sound should start only after I click. Use comfortable initial levels. I need to play with the result, not read code. Bring the working experiments together into one sound machine. I want three environments, City, Forest and Water. Each should have a recognisable continuous recorded background, occasional recorded events, and a synthesised atmospheric layer. The generated layer must move: slow volume swells, changing filter frequency and gentle stereo movement. Modulate the synthesis first, not only the samples. Let me shape intensity and movement without losing source levels and event timing. Offer a calm, a restless and a quiet musical direction. Use a subtle synthesised drone or sparse notes where useful, with space and lo-fi as optional treatments. The aim is an emotional, musical soundscape I could leave running, even if it is basic. Let the atmosphere develop rather than firing every event immediately. Keep the existing import, noise, filter, envelope, LFO and random capabilities accessible, with the detail controls in a separate panel if needed. Global stop must stop loops, notes, scheduled events, modulation and reverb. Keep the engine separate from the interface. Use only the supplied local recordings and generated audio. Do not use external services.