08通知ドロップダウンパネル

<main class="stage">
  <div class="np">
    <button class="np__bell is-demo" type="button" aria-label="通知" aria-expanded="true">
      <span class="np__bell-ic" aria-hidden="true"></span>
      <span class="np__badge">2</span>
    </button>
    <div class="np__panel is-open" role="menu" aria-label="通知リスト">
      <p class="np__panel-title">通知</p>
      <button class="np__item is-unread" type="button" role="menuitem">
        <span class="np__dot" aria-hidden="true"></span>
        <span class="np__item-body"><strong>新しいコメント</strong><span>パク・ハウンさんがコメントを残しました</span></span>
      </button>
      <button class="np__item is-unread" type="button" role="menuitem">
        <span class="np__dot" aria-hidden="true"></span>
        <span class="np__item-body"><strong>決済完了</strong><span>今月のサブスクが更新されました</span></span>
      </button>
      <button class="np__item" type="button" role="menuitem">
        <span class="np__dot" aria-hidden="true"></span>
        <span class="np__item-body"><strong>チーム招待</strong><span>チョン・ユナさんがチームに参加しました</span></span>
      </button>
    </div>
  </div>
</main>

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

$duration: $dur-quick;
$easing: $ease-pop;
$color: $subject-blue;

@include stage($stage-ink);

// 드롭다운이 아래로 펼쳐지므로 무대 중앙 정렬 대신 위쪽에 앵커한다 (실측: 중앙 정렬이면 패널이 300px 아래로 넘친다)
.stage { align-items: flex-start; padding-top: $sp-8; }

.np { position: relative; box-sizing: border-box; width: min(280px, 88vw); display: flex; justify-content: flex-end; }
.np__bell {
  position: relative;
  width: $sp-8; height: $sp-8;
  border-radius: 50%;
  border: 1px solid rgba(255, 247, 230, .22);
  background: rgba(255, 247, 230, .06);
  cursor: pointer;
  display: grid; place-items: center;
}
.np__bell-ic {
  width: 14px; height: 14px;
  border: 2px solid $subject-cream;
  border-bottom: 0;
  border-radius: $r-sm $r-sm 0 0;
  position: relative;
  transform-origin: top center; // 규칙8: 종 꼭지점 흔들림
}
.np__bell-ic::after {
  content: "";
  position: absolute; left: -3px; bottom: -4px;
  width: 20px; height: 2px;
  background: $subject-cream;
  border-radius: $r-xs;
}
.np__badge {
  position: absolute; top: 0; right: 0;
  min-width: 15px; height: 15px; padding: 0 $sp-1;
  border-radius: $r-pill;
  background: $error;
  color: $subject-cream;
  font-size: 9px; font-weight: 800; line-height: 15px; text-align: center;
  box-shadow: 0 0 0 2px $stage-ink;
}

.np__panel {
  box-sizing: border-box;
  position: absolute; top: calc(100% + #{$sp-2}); right: 0;
  width: 232px;
  border-radius: $r-card;
  background: #201c26;
  border: 1px solid rgba(255, 247, 230, .12);
  box-shadow: $shadow-raised;
  padding: $sp-2;
  transform-origin: top right; // 규칙8: 종 버튼 모서리서 펼침
  opacity: 0; transform: scale(.9) translateY(-4px);
  pointer-events: none;
  transition: opacity $duration $easing, transform $duration $easing;
}
.np__panel.is-open { opacity: 1; transform: scale(1) translateY(0); pointer-events: auto; }
.np__panel-title { margin: $sp-1 $sp-2 $sp-2; font-size: 11px; font-weight: 800; color: rgba(255, 247, 230, .55); }
.np__item {
  width: 100%;
  display: flex; align-items: flex-start; gap: $sp-2;
  border: 0; background: transparent; cursor: pointer;
  padding: $sp-2;
  border-radius: $r-sm;
  text-align: left;
  transition: background $dur-quick $easing;
}
.np__item:hover, .np__item:focus-visible { background: rgba(255, 247, 230, .06); }
.np__dot { flex: 0 0 auto; width: 7px; height: 7px; border-radius: 50%; margin-top: $sp-1; background: transparent; }
.np__item.is-unread .np__dot { background: $color; }
.np__item-body { display: flex; flex-direction: column; gap: 0; }
.np__item-body strong { font-size: 11px; color: $subject-cream; }
.np__item-body span { font-size: 10px; color: rgba(255, 247, 230, .5); }

// ── 자동 루프: 종이 살짝 흔들리고 패널이 열리는 모션을 반복한다 ──────────────
.np__bell.is-demo .np__bell-ic { animation: np-ring 2s ease-in-out infinite; }
.np__bell.is-demo + .np__panel { animation: np-pop 2s $easing infinite; }
@keyframes np-ring {
  0%, 78%, 100% { transform: rotate(0deg); }
  82%  { transform: rotate(14deg); }
  86%  { transform: rotate(-12deg); }
  90%  { transform: rotate(8deg); }
  94%  { transform: rotate(0deg); }
}
@keyframes np-pop {
  0%   { opacity: 0; transform: scale(.9) translateY(-4px); }
  16%, 100% { opacity: 1; transform: scale(1) translateY(0); }
}

@media (max-width: 340px) {
  .np__panel { width: 200px; }
}

@media (max-height: 220px) {
  .stage { padding-top: $sp-2; }
  .np__panel { top: calc(100% + 4px); padding: $sp-1; }
  .np__panel-title { display: none; }
  .np__item { padding: 4px $sp-1; gap: $sp-1; }
  .np__item-body strong { font-size: 10px; }
  .np__item-body span { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .np__bell.is-demo .np__bell-ic { animation: none !important; }
  .np__panel { animation: none !important; 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);
}

.stage {
  align-items: flex-start;
  padding-top: 32px;
}

.np {
  position: relative;
  box-sizing: border-box;
  width: min(280px, 88vw);
  display: flex;
  justify-content: flex-end;
}

.np__bell {
  position: relative;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid rgba(255, 247, 230, 0.22);
  background: rgba(255, 247, 230, 0.06);
  cursor: pointer;
  display: grid;
  place-items: center;
}

.np__bell-ic {
  width: 14px;
  height: 14px;
  border: 2px solid #fff7e6;
  border-bottom: 0;
  border-radius: 8px 8px 0 0;
  position: relative;
  transform-origin: top center;
}

.np__bell-ic::after {
  content: "";
  position: absolute;
  left: -3px;
  bottom: -4px;
  width: 20px;
  height: 2px;
  background: #fff7e6;
  border-radius: 4px;
}

.np__badge {
  position: absolute;
  top: 0;
  right: 0;
  min-width: 15px;
  height: 15px;
  padding: 0 4px;
  border-radius: 999px;
  background: #c2361a;
  color: #fff7e6;
  font-size: 9px;
  font-weight: 800;
  line-height: 15px;
  text-align: center;
  box-shadow: 0 0 0 2px #17141a;
}

.np__panel {
  box-sizing: border-box;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 232px;
  border-radius: 16px;
  background: #201c26;
  border: 1px solid rgba(255, 247, 230, 0.12);
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  padding: 8px;
  transform-origin: top right;
  opacity: 0;
  transform: scale(0.9) translateY(-4px);
  pointer-events: none;
  transition: opacity 220ms cubic-bezier(0.2, 1.4, 0.4, 1), transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.np__panel.is-open {
  opacity: 1;
  transform: scale(1) translateY(0);
  pointer-events: auto;
}

.np__panel-title {
  margin: 4px 8px 8px;
  font-size: 11px;
  font-weight: 800;
  color: rgba(255, 247, 230, 0.55);
}

.np__item {
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  text-align: left;
  transition: background 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.np__item:hover, .np__item:focus-visible {
  background: rgba(255, 247, 230, 0.06);
}

.np__dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin-top: 4px;
  background: transparent;
}

.np__item.is-unread .np__dot {
  background: #2f6df6;
}

.np__item-body {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.np__item-body strong {
  font-size: 11px;
  color: #fff7e6;
}

.np__item-body span {
  font-size: 10px;
  color: rgba(255, 247, 230, 0.5);
}

.np__bell.is-demo .np__bell-ic {
  animation: np-ring 2s ease-in-out infinite;
}

.np__bell.is-demo + .np__panel {
  animation: np-pop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes np-ring {
  0%, 78%, 100% {
    transform: rotate(0deg);
  }
  82% {
    transform: rotate(14deg);
  }
  86% {
    transform: rotate(-12deg);
  }
  90% {
    transform: rotate(8deg);
  }
  94% {
    transform: rotate(0deg);
  }
}
@keyframes np-pop {
  0% {
    opacity: 0;
    transform: scale(0.9) translateY(-4px);
  }
  16%, 100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}
@media (max-width: 340px) {
  .np__panel {
    width: 200px;
  }
}
@media (max-height: 220px) {
  .stage {
    padding-top: 8px;
  }
  .np__panel {
    top: calc(100% + 4px);
    padding: 4px;
  }
  .np__panel-title {
    display: none;
  }
  .np__item {
    padding: 4px 4px;
    gap: 4px;
  }
  .np__item-body strong {
    font-size: 10px;
  }
  .np__item-body span {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .np__bell.is-demo .np__bell-ic {
    animation: none !important;
  }
  .np__panel {
    animation: none !important;
    transition: none;
  }
}

// 실제 동작: 종을 누르면 패널이 실제로 열리고, 알림을 누르면 그 항목만 읽음 처리되며 배지 숫자가 실제로 줄어든다.
var bell = document.querySelector('.np__bell');
var panel = document.querySelector('.np__panel');
var badge = document.querySelector('.np__badge');
function unreadCount() { return document.querySelectorAll('.np__item.is-unread').length; }
function syncBadge() {
  var n = unreadCount();
  badge.textContent = String(n);
  badge.style.display = n > 0 ? '' : 'none';
}
bell.addEventListener('click', function () {
  bell.classList.remove('is-demo');
  var open = bell.getAttribute('aria-expanded') === 'true';
  bell.setAttribute('aria-expanded', String(!open));
  panel.classList.toggle('is-open', !open);
});
document.querySelectorAll('.np__item').forEach(function (it) {
  it.addEventListener('click', function () {
    it.classList.remove('is-unread');
    syncBadge();
  });
});
document.addEventListener('click', function (e) {
  if (!e.target.closest('.np')) { bell.setAttribute('aria-expanded', 'false'); panel.classList.remove('is-open'); }
});
syncBadge();

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

export type NotificationsPanelProps = {
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type Item = { id: string; title: string; desc: string; unread: boolean };

const INITIAL: Item[] = [
  { id: "a", title: "새 댓글", desc: "박하은님이 댓글을 남겼습니다", unread: true },
  { id: "b", title: "결제 완료", desc: "이번 달 구독이 갱신됐습니다", unread: true },
  { id: "c", title: "팀 초대", desc: "정유나님이 팀에 합류했습니다", unread: false },
];

export default function NotificationsPanel({ duration = 220, easing = "cubic-bezier(.2,1.4,.4,1)", color = "#2f6df6" }: NotificationsPanelProps) {
  const [open, setOpen] = useState(true);
  const [items, setItems] = useState(INITIAL);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const unread = items.filter((i) => i.unread).length;

  function markRead(id: string) {
    setItems((list) => list.map((i) => (i.id === id ? { ...i, unread: false } : i)));
  }

  return (
    <div className={styles.np} style={vars}>
      <button type="button" className={styles.bell} aria-label="알림" aria-expanded={open} onClick={() => setOpen((v) => !v)}>
        <span className={styles.bellIc} />
        {unread > 0 && <span className={styles.badge}>{unread}</span>}
      </button>
      <div className={`${styles.panel} ${open ? styles.open : ""}`} role="menu" aria-label="알림 목록">
        <p className={styles.panelTitle}>알림</p>
        {items.map((it) => (
          <button key={it.id} type="button" role="menuitem" className={styles.item} onClick={() => markRead(it.id)}>
            <span className={`${styles.dot} ${it.unread ? styles.unread : ""}`} />
            <span className={styles.itemBody}><strong>{it.title}</strong><span>{it.desc}</span></span>
          </button>
        ))}
      </div>
    </div>
  );
}