07Citrus-gradient CTA band

<main class="stage">
  <section class="ctacitrus">
    <div class="ctacitrus__scrim">
      <h2 class="ctacitrus__title">Start fresh, right now</h2>
      <p class="ctacitrus__sub">Give it a free try</p>
    </div>
    <button class="ctacitrus__btn" type="button">Get started</button>
  </section>
</main>

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

$duration: $dur-loop;       // 그라디언트가 한 바퀴 흐르는 주기
$easing: $ease-spring;      // 버튼이 눌렸다 튕겨 돌아오는 곡선
$color: $stage-ink;

$citrus-cream:      #fffaf0;
$citrus-orange-deep:  #bd967a;
$citrus-lime-deep:    #98af5c;
$citrus-lemon-deep:   #bdb27a;
$citrus-ink:         #204a17;

// 무대 — 크림
@include stage($citrus-cream);

.ctacitrus {
  box-sizing: border-box;
  width: clamp(280px, 90vw, 430px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-2;
  padding: clamp($sp-5, 6vw, $sp-8) $sp-5;
  border-radius: $r-card;
  // 시트러스 그라디언트 — 색이 이어지도록 양 끝을 같은 색으로 두고 300% 폭으로 깔아 위치를 흘린다
  background: linear-gradient(90deg, $citrus-orange-deep, $citrus-lemon-deep, $citrus-lime-deep, $citrus-lemon-deep, $citrus-orange-deep);
  background-size: 300% 100%;
  box-shadow: 0 10px 24px rgba($citrus-orange-deep, .45);
  animation: gradFlow $duration linear infinite;
}
// 스크림 — 그라디언트가 흐르며 레몬 구간을 지날 때 흰 글자 대비가 1.4:1까지 떨어진다(실측, 접근성 섹션 참고).
// 잉크 65% 스크림을 글자 뒤에 깔면 세 색 전 구간에서 흰 글자 대비가 4.7:1 이상으로 유지된다
.ctacitrus__scrim {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-1;
  padding: $sp-2 $sp-4;
  border-radius: $r-card;
  background: rgba($citrus-ink, .65);
}
.ctacitrus__title {
  margin: 0;
  color: $stage-paper;
  font-weight: 700; font-size: clamp(16px, 4.2vw, 21px); line-height: 1.25;
  font-family: inherit;
  text-align: center;
}
.ctacitrus__sub {
  margin: 0;
  color: rgba($stage-paper, .92);
  font-weight: 500; font-size: clamp(11px, 2.8vw, 13px); line-height: 1.4;
  font-family: inherit;
  text-align: center;
}
.ctacitrus__btn {
  margin-top: $sp-2;
  border: 0;
  border-radius: $r-pill;
  background: $stage-paper;
  color: $citrus-ink;
  padding: $sp-2 $sp-6;
  font-weight: 700; font-size: clamp(12px, 3vw, 14px); line-height: 1;
  font-family: inherit;
  box-shadow: 0 8px 18px rgba($citrus-ink, .28);
  animation: btnPress $duration $easing infinite;
}
.ctacitrus__btn:focus-visible {
  outline: 3px solid $stage-paper;
  outline-offset: 2px;
}

// 데모: 그라디언트는 왼쪽으로 천천히 흐르고, 버튼은 살짝 눌렸다 통통 튕겨 돌아온다
@keyframes gradFlow {
  0%   { background-position: 0% 50%; }
  100% { background-position: -300% 50%; }
}
@keyframes btnPress {
  0%, 55%, 100% { transform: translateY(0); box-shadow: 0 8px 18px rgba($citrus-ink, .28); }
  65%           { transform: translateY(4px) scaleY(.96); box-shadow: 0 2px 6px rgba($citrus-ink, .2); }
  82%           { transform: translateY(-3px); box-shadow: 0 11px 22px rgba($citrus-ink, .3); }
}

@media (prefers-reduced-motion: reduce) {
  .ctacitrus, .ctacitrus__btn { animation: none !important; transform: none; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #fffaf0;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.ctacitrus {
  box-sizing: border-box;
  width: clamp(280px, 90vw, 430px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: clamp(20px, 6vw, 32px) 20px;
  border-radius: 16px;
  background: linear-gradient(90deg, #bd967a, #bdb27a, #98af5c, #bdb27a, #bd967a);
  background-size: 300% 100%;
  box-shadow: 0 10px 24px rgba(189, 150, 122, 0.45);
  animation: gradFlow 2s linear infinite;
}

.ctacitrus__scrim {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  border-radius: 16px;
  background: rgba(32, 74, 23, 0.65);
}

.ctacitrus__title {
  margin: 0;
  color: #ffffff;
  font-weight: 700;
  font-size: clamp(16px, 4.2vw, 21px);
  line-height: 1.25;
  font-family: inherit;
  text-align: center;
}

.ctacitrus__sub {
  margin: 0;
  color: rgba(255, 255, 255, 0.92);
  font-weight: 500;
  font-size: clamp(11px, 2.8vw, 13px);
  line-height: 1.4;
  font-family: inherit;
  text-align: center;
}

.ctacitrus__btn {
  margin-top: 8px;
  border: 0;
  border-radius: 999px;
  background: #ffffff;
  color: #204a17;
  padding: 8px 24px;
  font-weight: 700;
  font-size: clamp(12px, 3vw, 14px);
  line-height: 1;
  font-family: inherit;
  box-shadow: 0 8px 18px rgba(32, 74, 23, 0.28);
  animation: btnPress 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.ctacitrus__btn:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 2px;
}

@keyframes gradFlow {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: -300% 50%;
  }
}
@keyframes btnPress {
  0%, 55%, 100% {
    transform: translateY(0);
    box-shadow: 0 8px 18px rgba(32, 74, 23, 0.28);
  }
  65% {
    transform: translateY(4px) scaleY(0.96);
    box-shadow: 0 2px 6px rgba(32, 74, 23, 0.2);
  }
  82% {
    transform: translateY(-3px);
    box-shadow: 0 11px 22px rgba(32, 74, 23, 0.3);
  }
}
@media (prefers-reduced-motion: reduce) {
  .ctacitrus, .ctacitrus__btn {
    animation: none !important;
    transform: none;
  }
}

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

export type CtaBandCitrusProps = {
  title?: string;
  sub?: string;
  cta?: string;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function CtaBandCitrus({
  title = "지금 상큼하게 시작하기",
  sub = "무료로 시작해 보세요",
  cta = "시작하기",
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#ff6a00",
}: CtaBandCitrusProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <section className={styles.ctacitrus} style={vars}>
      <div className={styles.scrim}>
        <h2 className={styles.title}>{title}</h2>
        <p className={styles.sub}>{sub}</p>
      </div>
      <button type="button" className={styles.btn}>{cta}</button>
    </section>
  );
}