07행진하는 사선 CTA

<main class="stage">
  <div class="cta">
    <span class="cta__stripes is-demo" aria-hidden="true"></span>
    <h3 class="cta__title">지금 팀에 합류시켜 보세요</h3>
    <button class="cta__btn" type="button">무료로 시작</button>
  </div>
</main>

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

$duration: $dur-loop;
$easing: $ease-out;         // 콘텐츠용(줄무늬 자체는 linear 로 고정 — 아래 주석)
$color: $stage-yellow;      // 줄무늬·버튼 색

$border: 3px;
$stripe: $sp-6;             // 줄무늬 한 칸 폭(24px), 두 칸 = 한 주기

@include stage($stage-orange);

.cta {
  box-sizing: border-box;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: $sp-3;
  width: clamp(260px, 90vw, 420px);
  padding: $sp-6 $sp-4;
  border: $border solid $subject-ink;
  border-radius: 0;
  background: $subject-ink;
  box-shadow: $sp-2 $sp-2 0 $subject-ink;
}
.cta__stripes {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: repeating-linear-gradient(45deg, $subject-ink 0 $stripe, $color $stripe $stripe * 2);
  // 사선 줄무늬 하드 에지(블러 없음). background-position 이동 거리를 무늬 한 주기(칸×2)와 똑같이 둬야
  // -50% 트랙 이음새 버그(BD15)처럼 매듭이 안 튄다 — 여긴 flex gap 이 아니라 배경 타일이라 애초에 그 문제가 없다
  animation: marchStripes $duration linear infinite;
}
.cta__title {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 80%;
  color: $subject-cream;
  font-weight: 900;
  font-size: clamp(18px, 4.6vw, 24px);
  line-height: 1.15;
}
.cta__btn {
  box-sizing: border-box;
  position: relative;
  z-index: 1;
  border: $border solid $subject-ink;
  border-radius: $r-pill;
  background: $color;
  color: $subject-ink;
  padding: $sp-2 $sp-6;
  font-weight: 800;
  font-size: clamp(12px, 2.8vw, 14px);
  box-shadow: $sp-1 $sp-1 0 $subject-cream;
}

// 데모: 사선 줄무늬가 배경-위치만 옮겨가며 끝없이 행진한다(무늬 한 주기만큼 이동 → 이음새 없음)
@keyframes marchStripes {
  from { background-position: 0 0; }
  to   { background-position: -($stripe * 2) -($stripe * 2); }
}

@media (prefers-reduced-motion: reduce) {
  .cta__stripes {
    animation: none !important;
    background-position: 0 0;
  }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.cta {
  box-sizing: border-box;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  width: clamp(260px, 90vw, 420px);
  padding: 24px 16px;
  border: 3px solid #17141a;
  border-radius: 0;
  background: #17141a;
  box-shadow: 8px 8px 0 #17141a;
}

.cta__stripes {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: repeating-linear-gradient(45deg, #17141a 0 24px, #ffd23f 24px 48px);
  animation: marchStripes 2s linear infinite;
}

.cta__title {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 80%;
  color: #fff7e6;
  font-weight: 900;
  font-size: clamp(18px, 4.6vw, 24px);
  line-height: 1.15;
}

.cta__btn {
  box-sizing: border-box;
  position: relative;
  z-index: 1;
  border: 3px solid #17141a;
  border-radius: 999px;
  background: #ffd23f;
  color: #17141a;
  padding: 8px 24px;
  font-weight: 800;
  font-size: clamp(12px, 2.8vw, 14px);
  box-shadow: 4px 4px 0 #fff7e6;
}

@keyframes marchStripes {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -96px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cta__stripes {
    animation: none !important;
    background-position: 0 0;
  }
}

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

export type CtaBandBrutalistProps = {
  title?: string;
  cta?: string;
  duration?: number;
  color?: string;
};

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

export default function CtaBandBrutalist({
  title = "지금 팀에 합류시켜 보세요",
  cta = "무료로 시작",
  duration = 2000,
  color = "#ffd23f",
}: CtaBandBrutalistProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--color": color };

  return (
    <div className={styles.cta} style={vars}>
      <span className={styles.stripes} aria-hidden="true" />
      <h3 className={styles.title}>{title}</h3>
      <button type="button" className={styles.btn}>{cta}</button>
    </div>
  );
}