04Backdrop blur

<main class="stage is-demo">
  <div class="page">
    <div class="page__line page__line--a"></div>
    <div class="page__line page__line--b"></div>
    <div class="page__line page__line--c"></div>
    <button class="trigger" type="button">Confirm payment</button>
  </div>
  <div class="overlay"></div>
  <div class="modal" role="dialog" aria-modal="true" aria-labelledby="t4">
    <h2 id="t4">Pay ₩67,000?</h2>
    <p>Take a moment while the background blurs to double-check.</p>
    <button class="modal__close" type="button">Pay</button>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-enter;     // 배경이 흐려지는 시간
$easing: $ease-out;
$color: $subject-blue;     // 강조색(버튼)

@include stage($stage-paper);

.stage { position: relative; }

// 뒤 화면 흉내 — 단색 배경만으로는 blur 가 보이지 않아 가짜 콘텐츠를 둔다
.page {
  position: absolute; inset: 0; display: grid; place-items: center; gap: clamp(8px, 3vmin, 14px);
}
.page__line {
  height: clamp(8px, 3vmin, 12px); border-radius: $r-control; background: rgba($stage-ink, .12);
  &--a { width: 55%; } &--b { width: 40%; } &--c { width: 62%; }
}

.trigger {
  border: 0; border-radius: $r-pill; margin-top: clamp(8px, 3vmin, 14px);
  padding: clamp(10px, 3.4vmin, 14px) clamp(20px, 7vmin, 30px);
  font-weight: 600;
  font-size: clamp(13px, 4vmin, 16px);
  line-height: 1;
  font-family: inherit;
  color: $stage-paper; background: $color;
  cursor: pointer; -webkit-tap-highlight-color: transparent;
}

.overlay {
  position: fixed; inset: 0;
  background: rgba($stage-ink, .28);
  backdrop-filter: blur(0px);
  opacity: 0; pointer-events: none;
  transition: opacity $duration $easing, backdrop-filter $duration $easing;
}

.modal {
  position: fixed; left: 50%; top: 50%;
  transform: translate(-50%, -50%) scale(.94);
  opacity: 0; pointer-events: none;
  width: min(78vw, 300px);
  padding: clamp(12px, 4.5vmin, 22px);
  border-radius: $r-card; background: $stage-paper; color: $stage-ink;
  box-shadow: $shadow-raised;
  transition: opacity $duration $easing, transform $duration $easing;

  h2 { margin: 0 0 6px; font-size: clamp(13px, 4.4vmin, 18px); }
  p  { margin: 0 0 14px; font-size: clamp(10px, 3.2vmin, 13px); color: rgba($stage-ink, .65); }
}

.modal__close {
  border: 0; border-radius: $r-control; background: $color; color: $stage-paper;
  padding: clamp(7px, 2.6vmin, 9px) clamp(14px, 4.6vmin, 18px);
  font-weight: 600;
  font-size: clamp(11px, 3.4vmin, 13px);
  line-height: 1;
  font-family: inherit;
  cursor: pointer;
}

.stage.is-open .overlay { opacity: 1; backdrop-filter: blur(8px); pointer-events: auto; }
.stage.is-open .modal   { opacity: 1; transform: translate(-50%, -50%) scale(1); pointer-events: auto; }

.stage.is-demo .overlay { animation: overlay-loop $dur-loop ease-in-out infinite; }
.stage.is-demo .modal   { animation: modal-loop $dur-loop $easing infinite; }

@keyframes overlay-loop {
  0%   { opacity: 0; backdrop-filter: blur(0px); }
  15%  { opacity: 1; backdrop-filter: blur(8px); }
  70%  { opacity: 1; backdrop-filter: blur(8px); }
  85%  { opacity: 0; backdrop-filter: blur(0px); }
  100% { opacity: 0; backdrop-filter: blur(0px); }
}
@keyframes modal-loop {
  0%   { opacity: 0; transform: translate(-50%, -50%) scale(.94); }
  15%  { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  70%  { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  85%  { opacity: 0; transform: translate(-50%, -50%) scale(.94); }
  100% { opacity: 0; transform: translate(-50%, -50%) scale(.94); }
}

@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .overlay, .stage.is-demo .modal { animation: none; }
  .overlay, .modal { transition-duration: 1ms; }
}

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

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

.stage {
  position: relative;
}

.page {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  gap: clamp(8px, 3vmin, 14px);
}

.page__line {
  height: clamp(8px, 3vmin, 12px);
  border-radius: 12px;
  background: rgba(23, 20, 26, 0.12);
}
.page__line--a {
  width: 55%;
}
.page__line--b {
  width: 40%;
}
.page__line--c {
  width: 62%;
}

.trigger {
  border: 0;
  border-radius: 999px;
  margin-top: clamp(8px, 3vmin, 14px);
  padding: clamp(10px, 3.4vmin, 14px) clamp(20px, 7vmin, 30px);
  font-weight: 600;
  font-size: clamp(13px, 4vmin, 16px);
  line-height: 1;
  font-family: inherit;
  color: #ffffff;
  background: #2f6df6;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(23, 20, 26, 0.28);
  backdrop-filter: blur(0px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 600ms ease-out, backdrop-filter 600ms ease-out;
}

.modal {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(0.94);
  opacity: 0;
  pointer-events: none;
  width: min(78vw, 300px);
  padding: clamp(12px, 4.5vmin, 22px);
  border-radius: 16px;
  background: #ffffff;
  color: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  transition: opacity 600ms ease-out, transform 600ms ease-out;
}
.modal h2 {
  margin: 0 0 6px;
  font-size: clamp(13px, 4.4vmin, 18px);
}
.modal p {
  margin: 0 0 14px;
  font-size: clamp(10px, 3.2vmin, 13px);
  color: rgba(23, 20, 26, 0.65);
}

.modal__close {
  border: 0;
  border-radius: 12px;
  background: #2f6df6;
  color: #ffffff;
  padding: clamp(7px, 2.6vmin, 9px) clamp(14px, 4.6vmin, 18px);
  font-weight: 600;
  font-size: clamp(11px, 3.4vmin, 13px);
  line-height: 1;
  font-family: inherit;
  cursor: pointer;
}

.stage.is-open .overlay {
  opacity: 1;
  backdrop-filter: blur(8px);
  pointer-events: auto;
}

.stage.is-open .modal {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  pointer-events: auto;
}

.stage.is-demo .overlay {
  animation: overlay-loop 2s ease-in-out infinite;
}

.stage.is-demo .modal {
  animation: modal-loop 2s ease-out infinite;
}

@keyframes overlay-loop {
  0% {
    opacity: 0;
    backdrop-filter: blur(0px);
  }
  15% {
    opacity: 1;
    backdrop-filter: blur(8px);
  }
  70% {
    opacity: 1;
    backdrop-filter: blur(8px);
  }
  85% {
    opacity: 0;
    backdrop-filter: blur(0px);
  }
  100% {
    opacity: 0;
    backdrop-filter: blur(0px);
  }
}
@keyframes modal-loop {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.94);
  }
  15% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  70% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  85% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.94);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.94);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .overlay, .stage.is-demo .modal {
    animation: none;
  }
  .overlay, .modal {
    transition-duration: 1ms;
  }
}

(function () {
  var stage = document.querySelector('.stage');
  var trigger = document.querySelector('.trigger');
  var overlay = document.querySelector('.overlay');
  var close = document.querySelector('.modal__close');
  function open() { stage.classList.remove('is-demo'); stage.classList.add('is-open'); }
  function shut() { stage.classList.remove('is-open'); }
  trigger.addEventListener('click', open);
  overlay.addEventListener('click', shut);
  close.addEventListener('click', shut);
  document.addEventListener('keydown', function (e) { if (e.key === 'Escape') shut(); });
})();

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

export type BackdropBlurModalProps = {
  triggerLabel: string;
  title: string;
  description: string;
  confirmLabel: string;
  /** 배경이 흐려지는 시간 (기본 600ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function BackdropBlurModal({
  triggerLabel,
  title,
  description,
  confirmLabel,
  duration = 600,
  easing = "ease-out",
  color = "#2f6df6",
}: BackdropBlurModalProps) {
  const [open, setOpen] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <div className={styles.stage} style={vars}>
      <div className={styles.page}>
        <div className={`${styles.line} ${styles.lineA}`} />
        <div className={`${styles.line} ${styles.lineB}`} />
        <button type="button" className={styles.trigger} onClick={() => setOpen(true)}>
          {triggerLabel}
        </button>
      </div>
      <div
        className={open ? `${styles.overlay} ${styles.isOpen}` : styles.overlay}
        onClick={() => setOpen(false)}
      />
      <div
        className={open ? `${styles.modal} ${styles.isOpen}` : styles.modal}
        role="dialog"
        aria-modal="true"
      >
        <h2>{title}</h2>
        <p>{description}</p>
        <button type="button" className={styles.confirm} onClick={() => setOpen(false)}>
          {confirmLabel}
        </button>
      </div>
    </div>
  );
}