09Neumorphic buttons & inputs

<main class="stage">
  <div class="uineu">
    <button class="uineu__btn is-demo" type="button">Save</button>
    <label class="uineu__field is-demo">
      <input class="uineu__input" type="text" placeholder="Enter your name" readonly>
    </label>
  </div>
</main>

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

$duration: $dur-loop;       // 눌림·포커스 전환의 한 주기
$easing: $ease-pop;         // 눌림 곡선
$color: $subject-blue;      // 포커스 글로우·강조 색

@include stage($stage-ink);

$neu-surface: mix($stage-ink, white, 92%);
$neu-light: rgba(mix($neu-surface, white, 40%), .5);
$neu-dark: rgba(mix($neu-surface, black, 40%), .5);

.uineu {
  display: flex;
  flex-direction: column;
  gap: $sp-4;
  width: clamp(220px, 70vw, 300px);
}
// 이 항목이 뉴모피즘의 핵심 원리다: 같은 표면(surface)이 튀어나온 것처럼도(raised),
// 파인 것처럼도(inset) 보일 수 있는 건 box-shadow 값 하나 때문이다.
// 라이트-다크 그림자 쌍의 offset 부호만 뒤집으면(raised → inset) 촉감이 반전된다.
.uineu__btn {
  border: 0;
  border-radius: $r-control;
  background: $neu-surface;
  color: $subject-blue-light;
  padding: $sp-3 $sp-5;
  font-weight: 700; font-size: clamp(12px, 2.8vw, 14px); line-height: 1;
  box-shadow: 6px 6px 12px $neu-dark, -6px -6px 12px $neu-light;
  animation: btnPress $duration $easing infinite;
}
.uineu__btn:focus-visible {
  // 뉴모피즘은 표면과 배경이 거의 같은 색이라 대기 상태의 테두리 대비가 사실상 0에 가깝다(WCAG 1.4.11 비텍스트 대비 미달).
  // 그림자만으로는 키보드 사용자·저시력 사용자에게 초점 위치가 안 보이므로, 포커스만은 고대비 링으로 별도 표시한다.
  outline: 3px solid $color;
  outline-offset: 2px;
}
.uineu__field {
  position: relative;
  display: block;
  border-radius: $r-control;
  background: $neu-surface;
  padding: $sp-1;
  box-shadow: inset 4px 4px 8px $neu-dark, inset -4px -4px 8px $neu-light;
  animation: focusGlow $duration $easing infinite;
}
.uineu__input {
  width: 100%;
  box-sizing: border-box;
  border: 0;
  background: transparent;
  border-radius: $r-control;
  padding: $sp-3 $sp-4;
  color: $subject-cream;
  font-weight: 500; font-size: clamp(12px, 2.8vw, 14px); line-height: 1;
  outline: none;
}
.uineu__input::placeholder { color: rgba($subject-cream, .5); }

// 데모: 버튼은 raised → inset 로 눌리며 그림자가 안으로 뒤집히고, 입력창은 포커스 글로우가 켜졌다 꺼진다
@keyframes btnPress {
  0%, 55%, 100% {
    box-shadow: 6px 6px 12px $neu-dark, -6px -6px 12px $neu-light;
    transform: scale(1);
  }
  75% {
    box-shadow: inset 4px 4px 8px $neu-dark, inset -4px -4px 8px $neu-light;
    transform: scale(.97);
  }
}
@keyframes focusGlow {
  0%, 55%, 100% {
    box-shadow: inset 4px 4px 8px $neu-dark, inset -4px -4px 8px $neu-light;
  }
  75% {
    box-shadow: inset 3px 3px 6px $neu-dark, inset -3px -3px 6px $neu-light, 0 0 0 3px rgba($color, .5);
  }
}

@media (prefers-reduced-motion: reduce) {
  .uineu__btn, .uineu__field { 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: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.uineu {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: clamp(220px, 70vw, 300px);
}

.uineu__btn {
  border: 0;
  border-radius: 12px;
  background: rgb(16.2980392157%, 15.2156862745%, 17.3803921569%);
  color: #5b8cf8;
  padding: 12px 20px;
  font-weight: 700;
  font-size: clamp(12px, 2.8vw, 14px);
  line-height: 1;
  box-shadow: 6px 6px 12px rgba(6.5192156863%, 6.0862745098%, 6.9521568627%, 0.5), -6px -6px 12px rgba(66.5192156863%, 66.0862745098%, 66.9521568627%, 0.5);
  animation: btnPress 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.uineu__btn:focus-visible {
  outline: 3px solid #2f6df6;
  outline-offset: 2px;
}

.uineu__field {
  position: relative;
  display: block;
  border-radius: 12px;
  background: rgb(16.2980392157%, 15.2156862745%, 17.3803921569%);
  padding: 4px;
  box-shadow: inset 4px 4px 8px rgba(6.5192156863%, 6.0862745098%, 6.9521568627%, 0.5), inset -4px -4px 8px rgba(66.5192156863%, 66.0862745098%, 66.9521568627%, 0.5);
  animation: focusGlow 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.uineu__input {
  width: 100%;
  box-sizing: border-box;
  border: 0;
  background: transparent;
  border-radius: 12px;
  padding: 12px 16px;
  color: #fff7e6;
  font-weight: 500;
  font-size: clamp(12px, 2.8vw, 14px);
  line-height: 1;
  outline: none;
}

.uineu__input::placeholder {
  color: rgba(255, 247, 230, 0.5);
}

@keyframes btnPress {
  0%, 55%, 100% {
    box-shadow: 6px 6px 12px rgba(6.5192156863%, 6.0862745098%, 6.9521568627%, 0.5), -6px -6px 12px rgba(66.5192156863%, 66.0862745098%, 66.9521568627%, 0.5);
    transform: scale(1);
  }
  75% {
    box-shadow: inset 4px 4px 8px rgba(6.5192156863%, 6.0862745098%, 6.9521568627%, 0.5), inset -4px -4px 8px rgba(66.5192156863%, 66.0862745098%, 66.9521568627%, 0.5);
    transform: scale(0.97);
  }
}
@keyframes focusGlow {
  0%, 55%, 100% {
    box-shadow: inset 4px 4px 8px rgba(6.5192156863%, 6.0862745098%, 6.9521568627%, 0.5), inset -4px -4px 8px rgba(66.5192156863%, 66.0862745098%, 66.9521568627%, 0.5);
  }
  75% {
    box-shadow: inset 3px 3px 6px rgba(6.5192156863%, 6.0862745098%, 6.9521568627%, 0.5), inset -3px -3px 6px rgba(66.5192156863%, 66.0862745098%, 66.9521568627%, 0.5), 0 0 0 3px rgba(47, 109, 246, 0.5);
  }
}
@media (prefers-reduced-motion: reduce) {
  .uineu__btn, .uineu__field {
    animation: none !important;
    transform: none;
  }
}

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

export type ButtonsInputsNeuProps = {
  buttonLabel?: string;
  placeholder?: string;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function ButtonsInputsNeu({
  buttonLabel = "저장하기",
  placeholder = "이름을 입력하세요",
  duration = 2000,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#2f6df6",
}: ButtonsInputsNeuProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <div className={styles.wrap} style={vars}>
      <button type="button" className={styles.btn}>{buttonLabel}</button>
      <label className={styles.field}>
        <input className={styles.input} type="text" placeholder={placeholder} />
      </label>
    </div>
  );
}