09グリッチ

<main class="stage">
  <div class="glitch">
    <span class="glitch__base" data-split>エラー発生</span>
    <span class="glitch__r" aria-hidden="true" data-split>エラー発生</span>
    <span class="glitch__b" aria-hidden="true" data-split>エラー発生</span>
  </div>
</main>

@use "../../../../site/static/demo-tokens" as *;

$duration: $dur-loop;                              // 글리치 두 번이 도는 한 주기
$easing: linear;
$base: $subject-cream;

@include stage($stage-ink);

.glitch {
  position: relative;
  font-weight: 800; font-size: clamp(26px, 8.4vw, 42px); line-height: 1.2; font-family: inherit;
  text-align: center;
}

.glitch__base, .glitch__r, .glitch__b {
  display: block;
  margin: 0;
}

.glitch__base { color: $base; }

.glitch__r, .glitch__b {
  position: absolute;
  inset: 0;
  mix-blend-mode: screen;
}

.glitch__r { color: $error;        animation: glitch-r $duration $easing infinite; }
.glitch__b { color: $subject-blue; animation: glitch-b $duration $easing infinite; }

.glitch .letter {
  display: inline-block;
  animation: letter-blur-in $duration $ease-out infinite;
  animation-delay: calc(var(--i) * 25ms + var(--n) * 50ms);
}

@keyframes glitch-r {
  0%   { transform: translateX(0);    clip-path: inset(0 0 0 0); }
  8%   { transform: translateX(-6px); clip-path: inset(12% 0 58% 0); }
  16%  { transform: translateX(4px);  clip-path: inset(48% 0 14% 0); }
  24%  { transform: translateX(0);    clip-path: inset(0 0 0 0); }
  50%  { transform: translateX(-4px); clip-path: inset(20% 0 40% 0); }
  58%  { transform: translateX(5px);  clip-path: inset(55% 0 8% 0); }
  66%  { transform: translateX(0);    clip-path: inset(0 0 0 0); }
  100% { transform: translateX(0);    clip-path: inset(0 0 0 0); }
}

@keyframes glitch-b {
  0%   { transform: translateX(0);    clip-path: inset(0 0 0 0); }
  8%   { transform: translateX(6px);  clip-path: inset(58% 0 10% 0); }
  16%  { transform: translateX(-4px); clip-path: inset(14% 0 48% 0); }
  24%  { transform: translateX(0);    clip-path: inset(0 0 0 0); }
  50%  { transform: translateX(4px);  clip-path: inset(40% 0 22% 0); }
  58%  { transform: translateX(-5px); clip-path: inset(8% 0 55% 0); }
  66%  { transform: translateX(0);    clip-path: inset(0 0 0 0); }
  100% { transform: translateX(0);    clip-path: inset(0 0 0 0); }
}

@keyframes letter-blur-in {
  0%, 2%    { filter: blur(8px); }
  10%, 100% { filter: blur(0); }
}

@media (prefers-reduced-motion: reduce) {
  .glitch__r, .glitch__b { animation: none; opacity: 0; }
  .glitch .letter { animation: none; filter: none; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.glitch {
  position: relative;
  font-weight: 800;
  font-size: clamp(26px, 8.4vw, 42px);
  line-height: 1.2;
  font-family: inherit;
  text-align: center;
}

.glitch__base, .glitch__r, .glitch__b {
  display: block;
  margin: 0;
}

.glitch__base {
  color: #fff7e6;
}

.glitch__r, .glitch__b {
  position: absolute;
  inset: 0;
  mix-blend-mode: screen;
}

.glitch__r {
  color: #c2361a;
  animation: glitch-r 2s linear infinite;
}

.glitch__b {
  color: #2f6df6;
  animation: glitch-b 2s linear infinite;
}

.glitch .letter {
  display: inline-block;
  animation: letter-blur-in 2s ease-out infinite;
  animation-delay: calc(var(--i) * 25ms + var(--n) * 50ms);
}

@keyframes glitch-r {
  0% {
    transform: translateX(0);
    clip-path: inset(0 0 0 0);
  }
  8% {
    transform: translateX(-6px);
    clip-path: inset(12% 0 58% 0);
  }
  16% {
    transform: translateX(4px);
    clip-path: inset(48% 0 14% 0);
  }
  24% {
    transform: translateX(0);
    clip-path: inset(0 0 0 0);
  }
  50% {
    transform: translateX(-4px);
    clip-path: inset(20% 0 40% 0);
  }
  58% {
    transform: translateX(5px);
    clip-path: inset(55% 0 8% 0);
  }
  66% {
    transform: translateX(0);
    clip-path: inset(0 0 0 0);
  }
  100% {
    transform: translateX(0);
    clip-path: inset(0 0 0 0);
  }
}
@keyframes glitch-b {
  0% {
    transform: translateX(0);
    clip-path: inset(0 0 0 0);
  }
  8% {
    transform: translateX(6px);
    clip-path: inset(58% 0 10% 0);
  }
  16% {
    transform: translateX(-4px);
    clip-path: inset(14% 0 48% 0);
  }
  24% {
    transform: translateX(0);
    clip-path: inset(0 0 0 0);
  }
  50% {
    transform: translateX(4px);
    clip-path: inset(40% 0 22% 0);
  }
  58% {
    transform: translateX(-5px);
    clip-path: inset(8% 0 55% 0);
  }
  66% {
    transform: translateX(0);
    clip-path: inset(0 0 0 0);
  }
  100% {
    transform: translateX(0);
    clip-path: inset(0 0 0 0);
  }
}
@keyframes letter-blur-in {
  0%, 2% {
    filter: blur(8px);
  }
  10%, 100% {
    filter: blur(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .glitch__r, .glitch__b {
    animation: none;
    opacity: 0;
  }
  .glitch .letter {
    animation: none;
    filter: none;
  }
}

(function(){
  function splitLetters(el){
    var text = el.textContent;
    el.textContent = "";
    Array.from(text).forEach(function(ch, i){
      var span = document.createElement("span");
      span.className = "letter";
      var seed = Math.sin((i + 1) * 12.9898) * 43758.5453;
      var noise = seed - Math.floor(seed);
      span.style.setProperty("--i", i);
      span.style.setProperty("--n", noise.toFixed(3));
      span.textContent = ch === " " ? " " : ch;
      el.appendChild(span);
    });
  }
  document.querySelectorAll("[data-split]").forEach(splitLetters);
})();

import type { CSSProperties } from "react";
import { useEffect, useRef } from "react";
import styles from "./GlitchText.module.scss";

type Vars = CSSProperties & { "--i"?: number; "--n"?: number };

function noise(i: number): number {
  const s = Math.sin((i + 1) * 12.9898) * 43758.5453;
  return Number((s - Math.floor(s)).toFixed(3));
}

export type GlitchTextProps = {
  text: string;
  /** 글리치 두 번이 도는 한 주기 (기본 2000ms) */
  duration?: number;
  color?: string;
};

export default function GlitchText({ text, duration = 2000, color = "#fff7e6" }: GlitchTextProps) {
  const ref = useRef<HTMLDivElement | null>(null);
  useEffect(() => {
    // reduced-motion 이면 재생 자체를 걸지 않는다 (el.animate() 를 쓰는 항목의 정리 규칙과 같다)
    return () => ref.current?.getAnimations().forEach((a) => a.cancel());
  }, []);
  const vars = { "--duration": `${duration}ms`, "--color": color } as CSSProperties;
  const chars = Array.from(text);
  const renderLetters = () =>
    chars.map((ch, i) => (
      <span key={i} className={styles.letter} style={{ "--i": i, "--n": noise(i) } as Vars}>
        {ch === " " ? " " : ch}
      </span>
    ));
  return (
    <div ref={ref} className={styles.glitch} style={vars}>
      <span className={styles.base}>{renderLetters()}</span>
      <span className={styles.r} aria-hidden="true">{renderLetters()}</span>
      <span className={styles.b} aria-hidden="true">{renderLetters()}</span>
    </div>
  );
}