TITLE: Ambience — Soundscape Mixer FILE: 092-soundscape-mixer.html === PROMPT (exact prompt used) === Build "Ambience — Soundscape Mixer", a calm app for mixing natural ambient sounds, all synthesized with Web Audio (no audio files): rain (filtered noise plus random droplet clicks), thunder (low noise bursts), wind (band-pass-swept noise), ocean waves (noise with slow amplitude swells), campfire (crackle impulses and a low rumble), forest birds (short FM chirps at random intervals), crickets (pulsed high sine tones), café murmur (band-limited noise through formant-like filters) and a soft drone pad. Each sound is a card with a hand-crafted SVG illustration that animates subtly while that sound is active (raindrops fall, flames flicker, waves roll), a volume slider and an on/off toggle. Earthy, calm palette: moss #606c38, deep forest #283618, cream #fefae0, sand #dda15e, clay #bc6c25. Presets ("Stormy cabin", "Beach at dusk", "Deep focus"), a master volume, and a sleep timer that fades everything out. The background gradient shifts subtly with the active mix. Typography: a soft humanist sans. Audio starts only after a gesture. SHARED REQUIREMENTS (apply to every page in this 100-page collection): 1. One standalone HTML5 file. All CSS inline in