EMA 20–55 + SMMA50 (20↔55 Band, Alerts, Color Controls)

This script plots a customizable EMA ribbon and a smoothed moving average (SMMA).

Key features:

EMA 20 (blue) and EMA 55 (yellow) highlighted with a green/red background ribbon depending on trend.

Optional middle EMAs (25, 30, 35, 40, 45, 50) can be shown or hidden.

SMMA (50) plotted in white as a trend smoother.

Customizable line colors, band colors, and transparency.

Alerts for EMA20/EMA55 bullish or bearish crossovers.

Optional candle bar coloring based on trend.

This is useful for quickly spotting medium-term trend shifts when EMA20 crosses EMA55, while still tracking the broader EMA ribbon context.