xK/xP/public/xP.css

body {
	margin: 0;
	padding: 0;
	font-family: sans-serif;
	font-size: clamp(0.5rem, 2vw, 1rem);
}
.xP {
	display: flex;
	flex-direction: column;
	overflow: hidden;
	height: 100vh;
	/* https://caniuse.com/viewport-unit-variants */
	height: 100dvh;
}

.title, .status {
	padding: .05em .3em;
	background: #eee;

	display: flex;
	justify-content: space-between;
	align-items: baseline;

	position: relative;
	border-top: 3px solid #ccc;
	border-bottom: 2px solid #888;
}
.title:before, .status:before {
	content: " ";
	position: absolute;
	left: 0;
	right: 0;
	height: 2px;
	top: -2px;
	background: #fff;
}
.title:after, .status:after {
	content: " ";
	position: absolute;
	left: 0;
	right: 0;
	height: 1px;
	bottom: -1px;
	background: #ccc;
}
button {
	font: inherit;
}

.middle {
	flex: auto;
	display: flex;
	flex-direction: row;
	overflow: hidden;
}

.list {
	overflow-y: auto;
	border-right: 2px solid #ccc;
	min-width: 10em;
	flex-shrink: 0;
}
.item {
	padding: .05em .3em;
	cursor: default;
}
.item.highlighted {
	color: #ff5f00;
}
.item.activity {
	font-weight: bold;
}
.item.current {
	font-style: italic;
	background: #eee;
}

/* Only Firefox currently supports align-content: safe end, thus this. */
.buffer-container {
	flex: auto;
	display: flex;
	flex-direction: column;
	overflow: hidden;
}
.filler {
	flex: auto;
}
.buffer {
	display: grid;
	grid-template-columns: max-content minmax(0, 1fr);
	overflow-y: auto;
}
.log {
	font-family: monospace;
	overflow-y: auto;
}
.log, .content {
	padding: .1em .3em;
	/* Note: https://bugs.chromium.org/p/chromium/issues/detail?id=1261435 */
	white-space: break-spaces;
	overflow-wrap: break-word;
}

.leaked {
	opacity: 50%;
}
.date {
	padding: .3em;
	grid-column: span 2;
	font-weight: bold;
}
.unread {
	grid-column: span 2;
	border-top: 1px solid #ff5f00;
}
.time {
	padding: .1em .3em;
	background: #f8f8f8;
	color: #bbb;
	border-right: 1px solid #ccc;
}
.time.hidden:after {
	border-top: .2em dotted #ccc;
	display: block;
	width: 50%;
	margin: 0 auto;
	content: "";
}
.mark {
	padding-right: .3em;
	text-align: center;
	display: inline-block;
	min-width: 2em;
}
.mark.error {
	color: red;
}
.mark.join {
	color: green;
}
.mark.part {
	color: red;
}
.mark.action {
	color: darkred;
}
.content .b {
	font-weight: bold;
}
.content .i {
	font-style: italic;
}
.content .u {
	text-decoration: underline;
}
.content .s {
	text-decoration: line-through;
}
.content .m {
	font-family: monospace;
}

textarea {
	font: inherit;
	padding: .05em .3em;
	margin: 0;
	border: 2px inset #eee;
	flex-shrink: 0;
	resize: vertical;
}
textarea:focus {
	outline: none;
	border-color: #ff5f00;
}