sendou.ink/app/components/layout/TopRightButtons.module.css

/* sized by the room the header has left, which the collapse thresholds below and in the children measure */
.container {
	container-type: inline-size;
	flex: 1;
	display: flex;
	justify-content: flex-end;
	gap: var(--s-4);
	min-width: 0;
}

.supportWrapper {
	flex-shrink: 0;

	@media screen and (max-width: 599px) {
		display: none;
	}
}

.supportWrapperCompact {
	display: none;
}

@media screen and (min-width: 600px) {
	@container (width < 360px) {
		.supportWrapper {
			display: none;
		}

		.supportWrapperCompact {
			display: block;
		}
	}

	@container (width < 540px) {
		.withStatus .supportWrapper {
			display: none;
		}

		.withStatus .supportWrapperCompact {
			display: block;
		}
	}
}

.searchAndAddContainer {
	display: flex;
	gap: var(--s-2);
	min-width: 0;
}

/* gives up its keyboard hint before the status text starts truncating, the thresholds below switch it to an icon */
.searchWrapper {
	container-type: inline-size;
	width: 10rem;
	min-width: 6rem;
	flex-shrink: 999999;
}

/* attached to add new */
.searchWrapper:not(:last-child) {
	margin-inline-end: calc(-1 * var(--s-2));

	& > a {
		border-inline-end: none;
		border-start-end-radius: 0;
		border-end-end-radius: 0;
	}
}

@media screen and (max-width: 599px) {
	@container (width < 371px) {
		.withStatus .searchWrapper {
			width: var(--field-size-sm);
			min-width: 0;
			flex-shrink: 0;
		}
	}
}

@media screen and (min-width: 600px) {
	@container (width < 296px) {
		.searchWrapper {
			width: var(--field-size-sm);
			min-width: 0;
			flex-shrink: 0;
		}
	}

	@container (width < 470px) {
		.withStatus .searchWrapper {
			width: var(--field-size-sm);
			min-width: 0;
			flex-shrink: 0;
		}
	}
}

.chatButtonWrapperPersistent {
	display: none;
	flex-shrink: 0;
	position: relative;

	@media screen and (min-width: 1000px) {
		display: block;
	}

	& > button {
		width: 100%;
	}
}

.chatButtonWrapperModal {
	display: none;
	flex-shrink: 0;
	position: relative;

	@media screen and (min-width: 600px) and (max-width: 999px) {
		display: block;
	}

	& > button {
		width: 100%;
	}
}

.chatUnreadBadge {
	position: absolute;
	top: -6px;
	right: -6px;
	font-size: var(--font-2xs);
	font-weight: var(--weight-bold);
	color: var(--color-fg-on-accent);
	background-color: var(--color-fill-accent);
	min-width: 18px;
	height: 18px;
	padding: 0 var(--s-1);
	border-radius: 9px;
	display: grid;
	place-items: center;
	pointer-events: none;
}

@media screen and (display-mode: standalone) {
	.chatSidebarModal {
		top: calc(var(--layout-nav-height) + env(safe-area-inset-top));
		height: calc(100% - var(--layout-nav-height) - env(safe-area-inset-top));

		&::backdrop {
			top: calc(var(--layout-nav-height) + env(safe-area-inset-top));
		}
	}
}

.chatSidebarModal {
	position: fixed;
	inset: 0;
	top: var(--layout-nav-height);
	margin: 0;
	margin-left: auto;
	padding: 0;
	max-width: none;
	max-height: none;
	height: calc(100% - var(--layout-nav-height));
	width: var(--layout-sidenav-width);
	border: none;
	border-left: 1.5px solid var(--color-border);
	background-color: var(--color-bg-nav);
	color: var(--color-text);
	outline: none;

	&::backdrop {
		background-color: rgba(0, 0, 0, 0.4);
		backdrop-filter: blur(4px);
		top: var(--layout-nav-height);
	}
}