05Marquee text band

<main class="stage">
  <section class="mcol">
    <div class="mcol__band mcol__band--coral">
      <div class="mcol__track">
        <span class="mcol__bit">COLLAGE</span>
        <span class="mcol__bit">MAXIMAL</span>
        <span class="mcol__bit">PASTE</span>
        <span class="mcol__bit">CUT</span>
        <span class="mcol__bit" aria-hidden="true">COLLAGE</span>
        <span class="mcol__bit" aria-hidden="true">MAXIMAL</span>
        <span class="mcol__bit" aria-hidden="true">PASTE</span>
        <span class="mcol__bit" aria-hidden="true">CUT</span>
      </div>
    </div>
    <div class="mcol__band mcol__band--lemon">
      <div class="mcol__track mcol__track--back">
        <span class="mcol__bit">Overlap</span>
        <span class="mcol__bit">Tilt</span>
        <span class="mcol__bit">Cut out</span>
        <span class="mcol__bit" aria-hidden="true">Overlap</span>
        <span class="mcol__bit" aria-hidden="true">Tilt</span>
        <span class="mcol__bit" aria-hidden="true">Cut out</span>
      </div>
    </div>
  </section>
</main>

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

// 콜라주·맥시멀 팔레트 (01 과 같은 값). 코랄 위는 흰 글자(4.59:1), 레몬 위는 ink 글자(11.82:1)
$cg-cream: #fbf3e4;
$cg-sheet: #ffffff;
$cg-ink:   #241d2e;
$cg-coral: #bb7f74;
$cg-lemon: #d1c8a3;

$serif: Georgia, "Nanum Myeongjo", "Times New Roman", serif;

$duration: $dur-loop;    // 한 벌 폭을 다 흘려보내는 한 주기
$easing: linear;         // 띠는 등속이어야 이음매가 안 보인다
$color: $cg-coral;       // 위 띠의 바탕색

@include stage($cg-cream);

.mcol {
  width: clamp(240px, 82vw, 340px);
  display: flex;
  flex-direction: column;
}

.mcol__band {
  box-sizing: border-box;
  overflow: hidden;
  padding: $sp-2 0;
  border-radius: $r-xs;
  box-shadow: 0 4px 0 rgba($cg-ink, .18);
}
.mcol__band--coral {
  z-index: 1;
  background: $cg-coral;
  color: $cg-sheet;
  transform: rotate(-2.5deg);
}
// 아래 띠는 조금 좁게, 오른쪽으로 밀어 붙인다. 겹치는 건 띠 가장자리끼리만 — 글자를 덮으면 콜라주가 아니라 사고다
.mcol__band--lemon {
  z-index: 2;
  width: 88%;
  margin-top: $sp-2;
  margin-left: auto;
  background: $cg-lemon;
  color: $cg-ink;
  transform: rotate(2deg);
}

// 트랙 — 같은 낱말 묶음을 두 벌 이어 붙이고 한 벌 폭(=50%)만 민다
.mcol__track {
  display: flex;
  width: max-content;
  animation-name: stripFlow;
  animation-duration: $duration;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
.mcol__track--back { animation-name: stripFlowBack; }

// 간격은 gap 이 아니라 낱개 margin-right — gap 은 2N 조각 사이에 2N-1 개뿐이라 -50% 가 어긋난다
.mcol__bit {
  margin-right: $sp-6;
  font-family: $serif;
  font-weight: 700;
  font-size: 17px;
  line-height: 1.2;
  letter-spacing: .06em;
  white-space: nowrap;
}

@keyframes stripFlow {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
@keyframes stripFlowBack {
  from { transform: translateX(-50%); }
  to   { transform: translateX(0); }
}

@media (max-width: 360px), (max-height: 230px) {
  .mcol { width: 236px; }
  .mcol__bit { font-size: 13px; margin-right: $sp-4; }
}

@media (prefers-reduced-motion: reduce) {
  .mcol__track { animation: none !important; transform: translateX(0); }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #fbf3e4;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.mcol {
  width: clamp(240px, 82vw, 340px);
  display: flex;
  flex-direction: column;
}

.mcol__band {
  box-sizing: border-box;
  overflow: hidden;
  padding: 8px 0;
  border-radius: 4px;
  box-shadow: 0 4px 0 rgba(36, 29, 46, 0.18);
}

.mcol__band--coral {
  z-index: 1;
  background: #bb7f74;
  color: #ffffff;
  transform: rotate(-2.5deg);
}

.mcol__band--lemon {
  z-index: 2;
  width: 88%;
  margin-top: 8px;
  margin-left: auto;
  background: #d1c8a3;
  color: #241d2e;
  transform: rotate(2deg);
}

.mcol__track {
  display: flex;
  width: max-content;
  animation-name: stripFlow;
  animation-duration: 2s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.mcol__track--back {
  animation-name: stripFlowBack;
}

.mcol__bit {
  margin-right: 24px;
  font-family: Georgia, "Nanum Myeongjo", "Times New Roman", serif;
  font-weight: 700;
  font-size: 17px;
  line-height: 1.2;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

@keyframes stripFlow {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}
@keyframes stripFlowBack {
  from {
    transform: translateX(-50%);
  }
  to {
    transform: translateX(0);
  }
}
@media (max-width: 360px), (max-height: 230px) {
  .mcol {
    width: 236px;
  }
  .mcol__bit {
    font-size: 13px;
    margin-right: 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .mcol__track {
    animation: none !important;
    transform: translateX(0);
  }
}

import type { CSSProperties } from "react";
import styles from "./MarqueeBandCollage.module.scss";

export type MarqueeBandCollageProps = {
  /** 위 띠의 낱말 한 벌. 화면에는 두 벌이 깔린다 */
  top?: string[];
  /** 아래 띠의 낱말 한 벌 */
  bottom?: string[];
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };

const defaultTop = ["COLLAGE", "MAXIMAL", "PASTE", "CUT"];
const defaultBottom = ["겹치기", "기울이기", "오리기"];

export default function MarqueeBandCollage({
  top = defaultTop,
  bottom = defaultBottom,
  duration = 2000,
  easing = "linear",
  color = "#d93a1e",
}: MarqueeBandCollageProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  // 한 벌을 그대로 복제해 두 벌을 깐다. 복제본은 스크린리더에서 숨긴다
  const doubled = (xs: string[]) => [...xs, ...xs];

  return (
    <section className={styles.mcol} style={vars}>
      <div className={`${styles.band} ${styles.bandCoral}`}>
        <div className={styles.track}>
          {doubled(top).map((w, i) => (
            <span key={`t${i}`} className={styles.bit} aria-hidden={i >= top.length}>{w}</span>
          ))}
        </div>
      </div>
      <div className={`${styles.band} ${styles.bandLemon}`}>
        <div className={`${styles.track} ${styles.trackBack}`}>
          {doubled(bottom).map((w, i) => (
            <span key={`b${i}`} className={styles.bit} aria-hidden={i >= bottom.length}>{w}</span>
          ))}
        </div>
      </div>
    </section>
  );
}