06Dark glow ring

<main class="stage">
  <div class="dg is-demo">
    <article class="dg__card">
      <div class="dg__ava">
        <span class="dg__halo" aria-hidden="true"></span>
        <span class="dg__ring" aria-hidden="true"></span>
        <span class="dg__avatar" aria-hidden="true"><span class="dg__init">MJ</span></span>
        <span class="dg__dot" aria-hidden="true"></span>
      </div>
      <h2 class="dg__name">Minjae Seo</h2>
      <p class="dg__role">Sound engineer</p>
      <p class="dg__stats">
        <span class="dg__stat"><strong>3,325</strong>Followers</span>
        <span class="dg__stat"><strong>57</strong>Posts</span>
      </p>
      <button class="dg__follow" type="button" id="dg-follow" aria-pressed="false">
        <svg class="dg__i dg__i--plus" viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><path d="M168 100a60 60 0 1 1-60-60a60 60 0 0 1 60 60" opacity=".2"/><path d="M256 136a8 8 0 0 1-8 8h-16v16a8 8 0 0 1-16 0v-16h-16a8 8 0 0 1 0-16h16v-16a8 8 0 0 1 16 0v16h16a8 8 0 0 1 8 8m-57.87 58.85a8 8 0 0 1-12.26 10.3C165.75 181.19 138.09 168 108 168s-57.75 13.19-77.87 37.15a8 8 0 0 1-12.25-10.3c14.94-17.78 33.52-30.41 54.17-37.17a68 68 0 1 1 71.9 0c20.65 6.76 39.23 19.39 54.18 37.17M108 152a52 52 0 1 0-52-52a52.06 52.06 0 0 0 52 52"/></g></svg>
        <svg class="dg__i dg__i--check" viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><path d="M232 56v144a16 16 0 0 1-16 16H40a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h176a16 16 0 0 1 16 16" opacity=".2"/><path d="m205.66 85.66l-96 96a8 8 0 0 1-11.32 0l-40-40a8 8 0 0 1 11.32-11.32L104 164.69l90.34-90.35a8 8 0 0 1 11.32 11.32"/></g></svg>
        <span class="dg__label" id="dg-label">Follow</span>
      </button>
    </article>
  </div>
</main>

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

$duration: $dur-enter;
$easing:   $ease-spring;
$color:    $subject-mint;

@include stage($stage-ink);

.dg {
  display: grid;
  place-items: center;
  user-select: none;
  -webkit-user-select: none;
}

.dg__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 300px;
  padding: $sp-4;
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .10);
  border-radius: $r-card;
}

.dg__ava {
  position: relative;
  width: 68px;
  height: 68px;
}
.dg__ring {
  position: absolute;
  inset: 0;
  border: 2px solid $subject-mint;
  border-radius: 50%;
  box-shadow: 0 0 18px rgba($subject-mint, .55), inset 0 0 10px rgba($subject-mint, .45);
}
.dg__halo {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  box-shadow: 0 0 26px 4px rgba($subject-mint, .55);
  opacity: .35;
  pointer-events: none;
}
.dg__avatar {
  position: absolute;
  inset: 8px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(rgba($subject-mint, .28), rgba($subject-blue, .20)), rgba(255, 255, 255, .05);
  font-size: 16px;
  line-height: 20px;
  font-weight: 700;
}
.dg__init {
  color: $subject-cream;
  filter: drop-shadow(0 0 6px rgba($subject-mint, .9));
}
.dg__dot {
  position: absolute;
  right: 0;
  bottom: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: $subject-mint;
  box-shadow: 0 0 10px rgba($subject-mint, .8);
}

.dg__name {
  margin: $sp-2 0 0;
  font-size: 16px;
  line-height: 20px;
  font-weight: 700;
  color: $subject-cream;
}
.dg__role {
  margin: $sp-1 0 0;
  font-size: 12px;
  line-height: 16px;
  font-weight: 500;
  color: rgba(255, 255, 255, .6);
}

.dg__stats {
  display: flex;
  gap: $sp-4;
  margin: $sp-3 0 0;
  font-size: 12px;
  line-height: 18px;
  font-weight: 500;
  color: rgba(255, 255, 255, .6);
}
.dg__stat strong {
  margin-right: $sp-1;
  font-weight: 700;
  color: $subject-cream;
  font-variant-numeric: tabular-nums;
}

.dg__follow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: $sp-1;
  height: 36px;
  margin: $sp-3 0 0;
  padding: 0 $sp-4;
  background: rgba($subject-mint, .10);
  border: 1px solid rgba($subject-mint, .7);
  border-radius: $r-control;
  color: $subject-cream;
  font-family: inherit;
  font-size: 13px;
  line-height: 16px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 0 14px rgba($subject-mint, .3);
  transition: box-shadow $duration $easing, background $dur-quick $easing;
}
.dg__follow:hover { background: rgba($subject-mint, .2); box-shadow: 0 0 22px rgba($subject-mint, .55); }
.dg__follow:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
.dg__follow[aria-pressed="true"] { box-shadow: 0 0 20px rgba($subject-mint, .5); }

.dg__i { display: inline-flex; }
.dg__i--check { display: none; color: $subject-mint; }
.dg__follow[aria-pressed="true"] .dg__i--plus { display: none; }
.dg__follow[aria-pressed="true"] .dg__i--check { display: inline-flex; }

// ── 자동 루프: 고리 번짐이 숨 쉬듯 오르내린다(아바타 고리·상태 점만 — 카드 바탕·무대는 고정).
//    box-shadow 값은 고정하고 halo/dot 의 opacity·scale 만 움직인다. 복귀는 88% 안 ──
.dg.is-demo .dg__halo {
  animation-name: dg-breathe;
  animation-duration: $dur-loop;
  animation-timing-function: $ease-out;
  animation-iteration-count: infinite;
}
.dg.is-demo .dg__dot {
  animation-name: dg-dot-breathe;
  animation-duration: $dur-loop;
  animation-timing-function: $ease-out;
  animation-iteration-count: infinite;
  animation-delay: 120ms;
  animation-fill-mode: backwards;   // 지연 구간에 선언 상태가 한 프레임 찍히는 것을 막는다
}
// 번짐의 양끝을 벌린다 — backwards 로 첫 프레임의 밝은 장이 빠지면서 강도가 14.3 까지
// 내려가 임계(15) 를 못 넘었다 (실측 2026-09-12). 밝기 폭을 넓혀 다시 올린다
@keyframes dg-breathe {
  0% { opacity: .18; transform: scale(.92); }
  38% { opacity: 1; transform: scale(1.10); }
  62% { opacity: 1; transform: scale(1.10); }
  88% { opacity: .18; transform: scale(.92); }
  100% { opacity: .18; transform: scale(.92); }
}
@keyframes dg-dot-breathe {
  0% { opacity: .4; transform: scale(.86); }
  38% { opacity: 1; transform: scale(1.12); }
  62% { opacity: 1; transform: scale(1.12); }
  88% { opacity: .4; transform: scale(.86); }
  100% { opacity: .4; transform: scale(.86); }
}

@media (max-width: 340px) {
  .dg__card { width: 272px; padding: $sp-2 $sp-3; }
  .dg__ava { width: 56px; height: 56px; }
  .dg__avatar { inset: 6px; font-size: 14px; line-height: 16px; }
  .dg__halo { inset: -6px; }
  .dg__dot { width: 10px; height: 10px; bottom: 0; }
  .dg__name { margin-top: $sp-1; font-size: 13px; line-height: 16px; }
  .dg__role { margin-top: 0; font-size: 11px; line-height: 14px; }
  .dg__stats { margin-top: $sp-1; gap: $sp-3; font-size: 11px; line-height: 15px; }
  .dg__follow { height: 32px; margin-top: $sp-1; padding: 0 $sp-3; font-size: 12px; line-height: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  .dg.is-demo .dg__halo,
  .dg.is-demo .dg__dot { animation: none !important; }
  .dg__follow { 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);
}

.dg {
  display: grid;
  place-items: center;
  user-select: none;
  -webkit-user-select: none;
}

.dg__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 300px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
}

.dg__ava {
  position: relative;
  width: 68px;
  height: 68px;
}

.dg__ring {
  position: absolute;
  inset: 0;
  border: 2px solid #4cd4a6;
  border-radius: 50%;
  box-shadow: 0 0 18px rgba(76, 212, 166, 0.55), inset 0 0 10px rgba(76, 212, 166, 0.45);
}

.dg__halo {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  box-shadow: 0 0 26px 4px rgba(76, 212, 166, 0.55);
  opacity: 0.35;
  pointer-events: none;
}

.dg__avatar {
  position: absolute;
  inset: 8px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(rgba(76, 212, 166, 0.28), rgba(47, 109, 246, 0.2)), rgba(255, 255, 255, 0.05);
  font-size: 16px;
  line-height: 20px;
  font-weight: 700;
}

.dg__init {
  color: #fff7e6;
  filter: drop-shadow(0 0 6px rgba(76, 212, 166, 0.9));
}

.dg__dot {
  position: absolute;
  right: 0;
  bottom: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #4cd4a6;
  box-shadow: 0 0 10px rgba(76, 212, 166, 0.8);
}

.dg__name {
  margin: 8px 0 0;
  font-size: 16px;
  line-height: 20px;
  font-weight: 700;
  color: #fff7e6;
}

.dg__role {
  margin: 4px 0 0;
  font-size: 12px;
  line-height: 16px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.6);
}

.dg__stats {
  display: flex;
  gap: 16px;
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 18px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.6);
}

.dg__stat strong {
  margin-right: 4px;
  font-weight: 700;
  color: #fff7e6;
  font-variant-numeric: tabular-nums;
}

.dg__follow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 36px;
  margin: 12px 0 0;
  padding: 0 16px;
  background: rgba(76, 212, 166, 0.1);
  border: 1px solid rgba(76, 212, 166, 0.7);
  border-radius: 12px;
  color: #fff7e6;
  font-family: inherit;
  font-size: 13px;
  line-height: 16px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 0 14px rgba(76, 212, 166, 0.3);
  transition: box-shadow 600ms cubic-bezier(0.2, 0.8, 0.2, 1), background 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.dg__follow:hover {
  background: rgba(76, 212, 166, 0.2);
  box-shadow: 0 0 22px rgba(76, 212, 166, 0.55);
}

.dg__follow:focus-visible {
  outline: 2px solid #4cd4a6;
  outline-offset: 2px;
}

.dg__follow[aria-pressed=true] {
  box-shadow: 0 0 20px rgba(76, 212, 166, 0.5);
}

.dg__i {
  display: inline-flex;
}

.dg__i--check {
  display: none;
  color: #4cd4a6;
}

.dg__follow[aria-pressed=true] .dg__i--plus {
  display: none;
}

.dg__follow[aria-pressed=true] .dg__i--check {
  display: inline-flex;
}

.dg.is-demo .dg__halo {
  animation-name: dg-breathe;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

.dg.is-demo .dg__dot {
  animation-name: dg-dot-breathe;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
  animation-delay: 120ms;
  animation-fill-mode: backwards;
}

@keyframes dg-breathe {
  0% {
    opacity: 0.18;
    transform: scale(0.92);
  }
  38% {
    opacity: 1;
    transform: scale(1.1);
  }
  62% {
    opacity: 1;
    transform: scale(1.1);
  }
  88% {
    opacity: 0.18;
    transform: scale(0.92);
  }
  100% {
    opacity: 0.18;
    transform: scale(0.92);
  }
}
@keyframes dg-dot-breathe {
  0% {
    opacity: 0.4;
    transform: scale(0.86);
  }
  38% {
    opacity: 1;
    transform: scale(1.12);
  }
  62% {
    opacity: 1;
    transform: scale(1.12);
  }
  88% {
    opacity: 0.4;
    transform: scale(0.86);
  }
  100% {
    opacity: 0.4;
    transform: scale(0.86);
  }
}
@media (max-width: 340px) {
  .dg__card {
    width: 272px;
    padding: 8px 12px;
  }
  .dg__ava {
    width: 56px;
    height: 56px;
  }
  .dg__avatar {
    inset: 6px;
    font-size: 14px;
    line-height: 16px;
  }
  .dg__halo {
    inset: -6px;
  }
  .dg__dot {
    width: 10px;
    height: 10px;
    bottom: 0;
  }
  .dg__name {
    margin-top: 4px;
    font-size: 13px;
    line-height: 16px;
  }
  .dg__role {
    margin-top: 0;
    font-size: 11px;
    line-height: 14px;
  }
  .dg__stats {
    margin-top: 4px;
    gap: 12px;
    font-size: 11px;
    line-height: 15px;
  }
  .dg__follow {
    height: 32px;
    margin-top: 4px;
    padding: 0 12px;
    font-size: 12px;
    line-height: 14px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .dg.is-demo .dg__halo,
  .dg.is-demo .dg__dot {
    animation: none !important;
  }
  .dg__follow {
    transition: none;
  }
}

// 실제 동작: Follow 토글(aria-pressed) · 첫 조작에 자동 루프 종료 (정적 번짐은 유지)
var root = document.querySelector('.dg');
var btn = document.getElementById('dg-follow');
var label = document.getElementById('dg-label');
function stopDemo() { root.classList.remove('is-demo'); }
root.addEventListener('pointerdown', stopDemo);
root.addEventListener('keydown', stopDemo);
btn.addEventListener('click', function () {
  var on = btn.getAttribute('aria-pressed') === 'true';
  btn.setAttribute('aria-pressed', on ? 'false' : 'true');
  label.textContent = on ? 'Follow' : 'Following';
});

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

export type DarkGlowCardProps = {
  name?: string;
  role?: string;
  initials?: string;
  followers?: string;
  posts?: string;
  duration?: number;
  easing?: string;
  color?: string;
};

type ClickEvt = { currentTarget: { blur(): void } };
type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };

const IconUserPlus = (): ReactNode => (
  <svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><path d="M168 100a60 60 0 1 1-60-60a60 60 0 0 1 60 60" opacity=".2"/><path d="M256 136a8 8 0 0 1-8 8h-16v16a8 8 0 0 1-16 0v-16h-16a8 8 0 0 1 0-16h16v-16a8 8 0 0 1 16 0v16h16a8 8 0 0 1 8 8m-57.87 58.85a8 8 0 0 1-12.26 10.3C165.75 181.19 138.09 168 108 168s-57.75 13.19-77.87 37.15a8 8 0 0 1-12.25-10.3c14.94-17.78 33.52-30.41 54.17-37.17a68 68 0 1 1 71.9 0c20.65 6.76 39.23 19.39 54.18 37.17M108 152a52 52 0 1 0-52-52a52.06 52.06 0 0 0 52 52"/></g></svg>
);
const IconCheck = (): ReactNode => (
  <svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><path d="M232 56v144a16 16 0 0 1-16 16H40a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h176a16 16 0 0 1 16 16" opacity=".2"/><path d="m205.66 85.66l-96 96a8 8 0 0 1-11.32 0l-40-40a8 8 0 0 1 11.32-11.32L104 164.69l90.34-90.35a8 8 0 0 1 11.32 11.32"/></g></svg>
);

export default function DarkGlowCard({
  name = "서민재",
  role = "사운드 엔지니어",
  initials = "MJ",
  followers = "3,325",
  posts = "57",
  duration = 600,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#4cd4a6",
}: DarkGlowCardProps): ReactNode {
  const [on, setOn] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  const toggle = (e: ClickEvt): void => {
    setOn((v: boolean): boolean => !v);
    e.currentTarget.blur();
  };

  return (
    <div className={styles.dg} style={vars}>
      <article className={styles.card}>
        <div className={styles.ava}>
          <span className={styles.halo} aria-hidden="true" />
          <span className={styles.ring} aria-hidden="true" />
          <span className={styles.avatar} aria-hidden="true"><span className={styles.init}>{initials}</span></span>
          <span className={styles.dot} aria-hidden="true" />
        </div>
        <h2 className={styles.name}>{name}</h2>
        <p className={styles.role}>{role}</p>
        <p className={styles.stats}>
          <span className={styles.stat}><strong>{followers}</strong>팔로워</span>
          <span className={styles.stat}><strong>{posts}</strong>게시물</span>
        </p>
        <button type="button" className={styles.follow} aria-pressed={on} onClick={toggle}>
          {on ? <IconCheck /> : <IconUserPlus />}
          <span className={styles.label}>{on ? "팔로잉" : "팔로우"}</span>
        </button>
      </article>
    </div>
  );
}