CSSだけで作る、繰り返しグリッチアニメーション

<div class="kumonosu-container">
	<div class="kumonosu-title-main" data-text="Glitch">Glitch</div>
	<div class="kumonosu-title-sub" data-text="グリッチ">グリッチ</div>
</div>

/*===========================================
        変数定義
===========================================*/
:root {
	--kumonosu-bg-color: #151118;
	--kumonosu-accent-cyan: #00F0FF;
	--kumonosu-accent-pink: #FF0055;
	--kumonosu-main-gradient: linear-gradient(100deg, #3624ff, #ff3c3c);
	--kumonosu-sub-color: #5e50ff;
	--kumonosu-glitch-interval: 4s;
}
/*===========================================
        レイアウト設定
===========================================*/
html, body {
	height: 100%;
	margin: 0;
	padding: 0;
}
body {
	background: var(--kumonosu-bg-color);
	display: grid;
	place-items: center;
	/* 上下左右中央配置 */
	overflow: hidden;
}
.kumonosu-container {
	text-align: center;
	padding: 20px;
}
/*===========================================
        メインタイトル
===========================================*/
.kumonosu-title-main {
	position: relative;
	display: inline-block;
	font-size: clamp(40px, 10vw, 80px);
	font-weight: bold;
	/* フォント指定なしのため太めに設定 */
	line-height: 1.2;
	letter-spacing: 0.05em;
	background: var(--kumonosu-main-gradient);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	animation: kumonosu-flicker var(--kumonosu-glitch-interval) infinite step-end;
}
/*===========================================
        サブタイトル
===========================================*/
.kumonosu-title-sub {
	position: relative;
	display: block;
	margin-top: 0.5em;
	font-size: clamp(14px, 3vw, 20px);
	color: var(--kumonosu-sub-color);
	letter-spacing: 0.2em;
	animation: kumonosu-flicker var(--kumonosu-glitch-interval) infinite step-end;
}
/*===========================================
        グリッチ共通設定 (疑似要素)
===========================================*/
.kumonosu-title-main::before,
.kumonosu-title-main::after,
.kumonosu-title-sub::before,
.kumonosu-title-sub::after {
	content: attr(data-text);
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	opacity: 0;
	pointer-events: none;
}
/* シアン：左ズレ */
.kumonosu-title-main::before,
.kumonosu-title-sub::before {
	left: -3px;
	text-shadow: 2px 0 var(--kumonosu-accent-cyan);
	-webkit-text-fill-color: var(--kumonosu-accent-cyan);
	animation: kumonosu-slice-cyan var(--kumonosu-glitch-interval) infinite step-end;
	z-index: -1;
}
/* ピンク：右ズレ */
.kumonosu-title-main::after,
.kumonosu-title-sub::after {
	left: 3px;
	text-shadow: -2px 0 var(--kumonosu-accent-pink);
	-webkit-text-fill-color: var(--kumonosu-accent-pink);
	animation: kumonosu-slice-pink var(--kumonosu-glitch-interval) infinite step-end;
	z-index: -2;
}
/*===========================================
        アニメーションキーフレーム (kumonosu-)
===========================================*/
/* 全体のチラつき */
@keyframes kumonosu-flicker {
	0% {
		opacity: 0;
		transform: translateX(4px);
	}
	2% {
		opacity: 1;
		transform: translateX(-4px);
	}
	4% {
		opacity: 0.5;
	}
	6% {
		opacity: 1;
		transform: translateX(0);
	}
	100% {
		opacity: 1;
	}
}
/* シアンの断片化 */
@keyframes kumonosu-slice-cyan {
	0% {
		opacity: 1;
		clip-path: inset(80% 0 0 0);
		transform: translateX(-10px);
	}
	2% {
		clip-path: inset(10% 0 60% 0);
		transform: translateX(10px);
	}
	4% {
		clip-path: inset(40% 0 30% 0);
		transform: translateX(-5px);
	}
	6% {
		clip-path: inset(0 0 90% 0);
		transform: translateX(5px);
	}
	8% {
		opacity: 0;
	}
	100% {
		opacity: 0;
	}
}
/* ピンクの断片化 */
@keyframes kumonosu-slice-pink {
	0% {
		opacity: 1;
		clip-path: inset(0 0 70% 0);
		transform: translateX(10px);
	}
	3% {
		clip-path: inset(50% 0 10% 0);
		transform: translateX(-10px);
	}
	5% {
		clip-path: inset(20% 0 50% 0);
		transform: translateX(5px);
	}
	7% {
		clip-path: inset(80% 0 0 0);
		transform: translateX(-5px);
	}
	9% {
		opacity: 0;
	}
	100% {
		opacity: 0;
	}
}