05Squish press effect

<main class="stage">
  <label class="switch is-demo">
    <input type="checkbox" class="switch__input" role="switch">
    <span class="switch__track">
      <span class="switch__bg switch__bg--off"></span>
      <span class="switch__bg switch__bg--on"></span>
      <span class="switch__knob"></span>
    </span>
    <span class="switch__label">Haptic feedback</span>
  </label>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: $dur-instant;
$easing: $ease-pop;
$color: $subject-blue;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-ink);

.switch {
  position: relative;
  display: inline-flex; align-items: center; gap: clamp(10px, 3vw, 14px);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.switch__input {
  position: absolute; inset: 0; width: 100%; height: 100%;
  margin: 0; opacity: 0; cursor: pointer;
}
.switch__track {
  position: relative; overflow: hidden;
  width: clamp(44px, 12vw, 52px); height: clamp(24px, 6.5vw, 28px);
  border-radius: $r-pill;
  transition: box-shadow $duration $easing;
}
.switch__bg { position: absolute; inset: 0; }
.switch__bg--off { background: rgba(255, 255, 255, .18); opacity: 1; }
.switch__bg--on  { background: $color; opacity: 0; }
.switch__knob {
  --x: 0px; --sx: 1; --sy: 1;
  position: absolute; top: 3px; left: 3px; z-index: 1;
  width: clamp(18px, 5vw, 22px); height: clamp(18px, 5vw, 22px);
  border-radius: 50%;
  background: $subject-cream;
  box-shadow: $shadow-press;
  transform: translateX(var(--x)) scaleX(var(--sx)) scaleY(var(--sy));
  transition: transform $duration $easing;
}
.switch__label { color: $subject-cream; font-weight: 600; font-size: clamp(14px, 4vw, 17px); line-height: 1; font-family: inherit; }

// ── 실제 동작: :checked 는 위치, :active 는 눌림만 (서로 안 덮는다) ──
.switch__input:checked ~ .switch__track .switch__bg--off { opacity: 0; transition: opacity $duration $easing; }
.switch__input:checked ~ .switch__track .switch__bg--on  { opacity: 1; transition: opacity $duration $easing; }
.switch__input:checked ~ .switch__track .switch__knob    { --x: 24px; }
.switch:active .switch__knob { --sx: 1.35; --sy: .8; }

.switch__input:focus-visible ~ .switch__track {
  outline: 2px solid $subject-cream; outline-offset: 3px;
}

// ── 데모 루프: 눌림 → 이동 → 눌림 → 되돌아감 ────────────
// 한 겹: 이동 도착 지점(28%) 앞에 오버슈트+squash 스트로크를 보강하고,
//        트랙은 상태 전환 때 내부 그림자가 깊어졌다 얕아진다.
.switch.is-demo .switch__bg--off { animation: bg-off-loop $dur-loop $ease-out infinite; }
.switch.is-demo .switch__bg--on  { animation: bg-on-loop $dur-loop $ease-out infinite; }
.switch.is-demo .switch__knob    { animation: squish-loop $dur-loop $easing infinite; }
.switch.is-demo .switch__track   { animation: shadow-depth-loop $dur-loop $easing infinite; }

@keyframes bg-off-loop { 0%, 20% { opacity: 1; } 28%, 60% { opacity: 0; } 85%, 100% { opacity: 1; } }
@keyframes bg-on-loop  { 0%, 20% { opacity: 0; } 28%, 60% { opacity: 1; } 85%, 100% { opacity: 0; } }
@keyframes squish-loop {
  0%, 8%    { transform: translateX(0) scaleX(1) scaleY(1); }
  16%       { transform: translateX(0) scaleX(1.35) scaleY(.8); }
  24%       { transform: translateX(26px) scaleX(1.2) scaleY(.88); }   // 이동 오버슈트 + squash
  28%, 60%  { transform: translateX(24px) scaleX(1) scaleY(1); }
  68%       { transform: translateX(24px) scaleX(1.35) scaleY(.8); }
  85%, 100% { transform: translateX(0) scaleX(1) scaleY(1); }
}
@keyframes shadow-depth-loop {
  0%, 20%   { box-shadow: inset 0 1px 3px rgba(0, 0, 0, .15); }
  24%       { box-shadow: inset 0 3px 8px rgba(0, 0, 0, .28); }
  28%, 60%  { box-shadow: inset 0 3px 8px rgba(0, 0, 0, .28); }
  85%, 100% { box-shadow: inset 0 1px 3px rgba(0, 0, 0, .15); }
}

@media (prefers-reduced-motion: reduce) {
  .switch.is-demo .switch__bg--off, .switch.is-demo .switch__bg--on, .switch.is-demo .switch__knob,
  .switch.is-demo .switch__track {
    animation: none !important;
  }
  .switch__knob, .switch__bg--off, .switch__bg--on { transition: none; }
  .switch__track { transition: 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);
}

.switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: clamp(10px, 3vw, 14px);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.switch__input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.switch__track {
  position: relative;
  overflow: hidden;
  width: clamp(44px, 12vw, 52px);
  height: clamp(24px, 6.5vw, 28px);
  border-radius: 999px;
  transition: box-shadow 140ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.switch__bg {
  position: absolute;
  inset: 0;
}

.switch__bg--off {
  background: rgba(255, 255, 255, 0.18);
  opacity: 1;
}

.switch__bg--on {
  background: #2f6df6;
  opacity: 0;
}

.switch__knob {
  --x: 0px;
  --sx: 1;
  --sy: 1;
  position: absolute;
  top: 3px;
  left: 3px;
  z-index: 1;
  width: clamp(18px, 5vw, 22px);
  height: clamp(18px, 5vw, 22px);
  border-radius: 50%;
  background: #fff7e6;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  transform: translateX(var(--x)) scaleX(var(--sx)) scaleY(var(--sy));
  transition: transform 140ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.switch__label {
  color: #fff7e6;
  font-weight: 600;
  font-size: clamp(14px, 4vw, 17px);
  line-height: 1;
  font-family: inherit;
}

.switch__input:checked ~ .switch__track .switch__bg--off {
  opacity: 0;
  transition: opacity 140ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.switch__input:checked ~ .switch__track .switch__bg--on {
  opacity: 1;
  transition: opacity 140ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.switch__input:checked ~ .switch__track .switch__knob {
  --x: 24px;
}

.switch:active .switch__knob {
  --sx: 1.35;
  --sy: .8;
}

.switch__input:focus-visible ~ .switch__track {
  outline: 2px solid #fff7e6;
  outline-offset: 3px;
}

.switch.is-demo .switch__bg--off {
  animation: bg-off-loop 2s ease-out infinite;
}

.switch.is-demo .switch__bg--on {
  animation: bg-on-loop 2s ease-out infinite;
}

.switch.is-demo .switch__knob {
  animation: squish-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.switch.is-demo .switch__track {
  animation: shadow-depth-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes bg-off-loop {
  0%, 20% {
    opacity: 1;
  }
  28%, 60% {
    opacity: 0;
  }
  85%, 100% {
    opacity: 1;
  }
}
@keyframes bg-on-loop {
  0%, 20% {
    opacity: 0;
  }
  28%, 60% {
    opacity: 1;
  }
  85%, 100% {
    opacity: 0;
  }
}
@keyframes squish-loop {
  0%, 8% {
    transform: translateX(0) scaleX(1) scaleY(1);
  }
  16% {
    transform: translateX(0) scaleX(1.35) scaleY(0.8);
  }
  24% {
    transform: translateX(26px) scaleX(1.2) scaleY(0.88);
  }
  28%, 60% {
    transform: translateX(24px) scaleX(1) scaleY(1);
  }
  68% {
    transform: translateX(24px) scaleX(1.35) scaleY(0.8);
  }
  85%, 100% {
    transform: translateX(0) scaleX(1) scaleY(1);
  }
}
@keyframes shadow-depth-loop {
  0%, 20% {
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.15);
  }
  24% {
    box-shadow: inset 0 3px 8px rgba(0, 0, 0, 0.28);
  }
  28%, 60% {
    box-shadow: inset 0 3px 8px rgba(0, 0, 0, 0.28);
  }
  85%, 100% {
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.15);
  }
}
@media (prefers-reduced-motion: reduce) {
  .switch.is-demo .switch__bg--off, .switch.is-demo .switch__bg--on, .switch.is-demo .switch__knob,
  .switch.is-demo .switch__track {
    animation: none !important;
  }
  .switch__knob, .switch__bg--off, .switch__bg--on {
    transition: none;
  }
  .switch__track {
    transition: none;
  }
}

document.querySelectorAll(".switch").forEach(function (s) {
  var input = s.querySelector(".switch__input");
  var sync = function () { input.setAttribute("aria-checked", String(input.checked)); };
  input.addEventListener("pointerdown", function () { s.classList.remove("is-demo"); });
  input.addEventListener("change", sync);
  sync();
});

import { useState } from "react";
import type { ChangeEvent, CSSProperties } from "react";
import styles from "./SquishToggle.module.scss";

export type SquishToggleProps = {
  label?: string;
  /** 눌림 트랜지션 시간 (기본 140ms) */
  duration?: number;
  /** 팝 이징 */
  easing?: string;
  color?: string;
  defaultChecked?: boolean;
  onChange?: (checked: boolean) => void;
};

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

export default function SquishToggle({
  label = "진동 피드백",
  duration = 140,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#2f6df6",
  defaultChecked = false,
  onChange,
}: SquishToggleProps) {
  const [checked, setChecked] = useState(defaultChecked);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <label className={styles.switch} style={vars}>
      <input
        type="checkbox"
        role="switch"
        aria-checked={checked}
        className={styles.switch__input}
        checked={checked}
        onChange={(e: ChangeEvent<HTMLInputElement>) => { setChecked(e.target.checked); onChange?.(e.target.checked); }}
      />
      <span className={styles.switch__track}>
        <span className={styles["switch__bg--off"]} />
        <span className={styles["switch__bg--on"]} />
        <span className={styles.switch__knob} />
      </span>
      <span className={styles.switch__label}>{label}</span>
    </label>
  );
}