/* Sliding Puzzle only. Everything else comes from ../shared/game.css. */
#screen{touch-action:none;user-select:none;-webkit-user-select:none}   /* taps and swipes slide tiles, never scroll */
canvas#world:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
/* the bar fills tile by tile: pond green to sunny gold */
.progress-fill{background:linear-gradient(90deg,#3fae74,#7ee0a6,#ffd84a);transition:width .2s ease-out}