/* ---------- Decorative swimming fish (CSS only; transform animations are cheap) ---------- */
.bb-fish {
	position: absolute;
	inset: 0;
	pointer-events: none;
	overflow: hidden;
}

.bb-fish__item {
	position: absolute;
	top: var(--y);
	left: 0;
	width: var(--s);
	opacity: var(--o);
	color: #fff;
	will-change: transform;
}

.bb-fish__item svg {
	display: block;
	width: 100%;
	height: auto;
	fill: currentcolor;
	animation: bb-bob 3.4s ease-in-out infinite alternate;
}

.bb-fish__item .bb-fish__eye {
	fill: #0d161d;
}

.bb-fish__item--accent {
	color: var(--bb-orange);
}

.bb-fish__item--ltr {
	animation: bb-swim-ltr var(--d) linear var(--delay) infinite;
}

.bb-fish__item--rtl {
	animation: bb-swim-rtl var(--d) linear var(--delay) infinite;
}

.bb-fish__item--rtl svg {
	transform: scaleX(-1);
}

@keyframes bb-swim-ltr {
	from {
		transform: translateX(-20vw);
	}

	to {
		transform: translateX(110vw);
	}
}

@keyframes bb-swim-rtl {
	from {
		transform: translateX(110vw);
	}

	to {
		transform: translateX(-20vw);
	}
}

/* a gentle up-and-down on the fish itself */
@keyframes bb-bob {
	from {
		translate: 0 -5px;
		rotate: -2deg;
	}

	to {
		translate: 0 6px;
		rotate: 2deg;
	}
}

.bb-fish__bubble {
	position: absolute;
	bottom: -12px;
	left: var(--x);
	width: 7px;
	height: 7px;
	border: 1px solid rgba(255, 255, 255, 0.35);
	border-radius: 50%;
	animation: bb-rise var(--d) linear var(--delay) infinite;
}

@keyframes bb-rise {
	from {
		transform: translateY(0);
		opacity: 0;
	}

	15% {
		opacity: 1;
	}

	to {
		transform: translateY(-260px);
		opacity: 0;
	}
}

/* Visitors who prefer less motion get still fish. */
@media (prefers-reduced-motion: reduce) {
	.bb-fish__item,
	.bb-fish__item svg,
	.bb-fish__bubble {
		animation: none;
	}

	.bb-fish__item--ltr {
		transform: translateX(30vw);
	}

	.bb-fish__item--rtl {
		transform: translateX(62vw);
	}

	.bb-fish__bubble {
		display: none;
	}
}

/* Small screens: fewer fish keeps it calm and light. */
@media (max-width: 700px) {
	.bb-fish__item:nth-of-type(n + 4),
	.bb-fish__bubble:nth-of-type(n + 3) {
		display: none;
	}
}