TITLE: Harmonia — Pendulum Wave FILE: 017-pendulum-wave.html === PROMPT (exact prompt used) === Create "Harmonia — Pendulum Wave", a physically accurate pendulum-wave simulation as minimalist kinetic art. Charcoal background (#16171b); 18 pendulums whose lengths are chosen so they complete 51, 52, 53… oscillations in 60 seconds (the classic pendulum-wave set-up), rendered from a slightly elevated 3D perspective with fine white strings and glowing spheres in a gradient spectrum from #ffd6a5 to #9bf6ff, plus optional light trails that paint Lissajous-like ribbons. A thin brushed-metal mounting bar at the top. Beneath, an elegant monospace readout: elapsed time, cycle phase, and a timeline scrubber showing where you are in the 60-second pattern (snake, split, chaos, realignment). Controls: play/pause, speed (0.25×–4×), trails toggle, view toggle (side / top-down), and "Release", which pulls every pendulum back and lets them drop. Optional soft chime whenever a pendulum crosses centre (Web Audio pentatonic, after a gesture, muted by default). Typography: thin sans plus mono. SHARED REQUIREMENTS (apply to every page in this 100-page collection): 1. One standalone HTML5 file. All CSS inline in