09Press-into-shadow button

<main class="stage">
  <form class="form">
    <label class="form__field">
      <input class="form__input is-demo" type="email" placeholder="Email address" readonly>
    </label>
    <button class="form__btn is-demo" type="button">Sign up</button>
  </form>
</main>

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

$duration: $dur-loop;
$easing: $ease-pop;
$color: $subject-blue;      // 버튼 색

$border: 3px;

@include stage($stage-ink);

.form {
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: $sp-3;
  width: clamp(240px, 82vw, 340px);
  padding: $sp-4;
  border: $border solid $subject-ink;
  border-radius: 0;
  background: $subject-cream;
  box-shadow: $sp-2 $sp-2 0 $subject-ink;
}
.form__field { display: block; }
.form__input {
  box-sizing: border-box;
  width: 100%;
  border: $border solid $subject-ink;
  border-radius: 0;
  background: $stage-paper;
  padding: $sp-2 $sp-3;
  color: $subject-ink;
  font-weight: 600;
  font-size: clamp(12px, 2.8vw, 13px);
  box-shadow: 0 0 0 rgba($stage-orange, 0);
  animation: focusPop $duration $easing infinite;
}
.form__btn {
  box-sizing: border-box;
  align-self: flex-start;
  border: $border solid $subject-ink;
  border-radius: $r-pill;
  background: $subject-blue-deep;
  color: $subject-cream;
  padding: $sp-2 $sp-6;
  font-weight: 800;
  font-size: clamp(12px, 2.8vw, 14px);
  box-shadow: $sp-2 $sp-2 0 $subject-ink;
  animation: pressInto $duration $easing infinite;
  animation-delay: -1s;
}

// 데모: 버튼은 그림자 오프셋만큼 정확히 이동하며 그림자가 동시에 0 으로 줄어 "그림자 자리로 파고드는" 느낌을 준다.
// 입력창은 초점 링이 0에서 뿅 나타났다 사라진다
@keyframes pressInto {
  0%, 50%, 100% { transform: translate(0, 0); box-shadow: $sp-2 $sp-2 0 $subject-ink; }
  70%           { transform: translate($sp-2, $sp-2); box-shadow: 0 0 0 $subject-ink; }
}
@keyframes focusPop {
  0%, 60%, 100% { box-shadow: 0 0 0 rgba($stage-orange, 0); border-color: $subject-ink; }
  80%           { box-shadow: $sp-1 $sp-1 0 $stage-orange; border-color: $stage-orange; }
}

@media (prefers-reduced-motion: reduce) {
  .form__btn {
    animation: none !important;
    transform: none;
    box-shadow: $sp-2 $sp-2 0 $subject-ink;
  }
  .form__input {
    animation: none !important;
    box-shadow: 0 0 0 rgba($stage-orange, 0);
    border-color: $subject-ink;
  }
}

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);
}

.form {
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: clamp(240px, 82vw, 340px);
  padding: 16px;
  border: 3px solid #17141a;
  border-radius: 0;
  background: #fff7e6;
  box-shadow: 8px 8px 0 #17141a;
}

.form__field {
  display: block;
}

.form__input {
  box-sizing: border-box;
  width: 100%;
  border: 3px solid #17141a;
  border-radius: 0;
  background: #ffffff;
  padding: 8px 12px;
  color: #17141a;
  font-weight: 600;
  font-size: clamp(12px, 2.8vw, 13px);
  box-shadow: 0 0 0 rgba(255, 77, 31, 0);
  animation: focusPop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.form__btn {
  box-sizing: border-box;
  align-self: flex-start;
  border: 3px solid #17141a;
  border-radius: 999px;
  background: #0a4fe8;
  color: #fff7e6;
  padding: 8px 24px;
  font-weight: 800;
  font-size: clamp(12px, 2.8vw, 14px);
  box-shadow: 8px 8px 0 #17141a;
  animation: pressInto 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
  animation-delay: -1s;
}

@keyframes pressInto {
  0%, 50%, 100% {
    transform: translate(0, 0);
    box-shadow: 8px 8px 0 #17141a;
  }
  70% {
    transform: translate(8px, 8px);
    box-shadow: 0 0 0 #17141a;
  }
}
@keyframes focusPop {
  0%, 60%, 100% {
    box-shadow: 0 0 0 rgba(255, 77, 31, 0);
    border-color: #17141a;
  }
  80% {
    box-shadow: 4px 4px 0 #ff4d1f;
    border-color: #ff4d1f;
  }
}
@media (prefers-reduced-motion: reduce) {
  .form__btn {
    animation: none !important;
    transform: none;
    box-shadow: 8px 8px 0 #17141a;
  }
  .form__input {
    animation: none !important;
    box-shadow: 0 0 0 rgba(255, 77, 31, 0);
    border-color: #17141a;
  }
}

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

export type ButtonsInputsBrutalistProps = {
  placeholder?: string;
  cta?: string;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function ButtonsInputsBrutalist({
  placeholder = "이메일 주소",
  cta = "등록하기",
  duration = 2000,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#0a4fe8",
}: ButtonsInputsBrutalistProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <form className={styles.form} style={vars}>
      <label className={styles.field}>
        <input className={styles.input} type="email" placeholder={placeholder} readOnly />
      </label>
      <button type="button" className={styles.btn}>{cta}</button>
    </form>
  );
}