Infinite Coastline — Mandelbrot & Julia Explorer

A full-screen, black-and-gold instrument for exploring the Mandelbrot set and its Julia sets. The fractal fills the window with smooth, continuous colouring, and the palette is mapped relative to the lowest escape value in view, so the far exterior falls to black and the coastline glows. Thin gold typography and hairline panels with corner ticks frame the image: a spaced-caps "Infinite Coastline" title, a position readout (real, imaginary, zoom in scientific notation, auto-rising iteration count, cursor or seed c, render progress and time), a bookmark panel whose live thumbnails are rendered by the page itself, and a toolbar with zoom, reset, four palette swatches (Aurum, Abyss, Magma, Pastel Dream), colour cycling, the Julia toggle and PNG export. A circular gold-ringed lens trails the cursor and shows, live, the Julia set for the point beneath it.