05Mini comment thread with folding replies

<main class="stage">
  <section class="ct is-demo" id="ct" aria-label="Comment thread">
    <article class="ct__top">
      <span class="ct__av" style="--a:#90c8b5">P</span>
      <div class="ct__body">
        <p class="ct__txt"><b>Park Seo-a</b>  Where can I see the new release schedule?</p>
        <time class="ct__tm">1h ago</time>
      </div>
    </article>
    <button class="ct__tg" type="button" id="ct-tg" aria-expanded="false" aria-controls="ct-re">
      <span class="ct__caret" aria-hidden="true"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor"><g><path d="m208 96l-80 80l-80-80Z" opacity=".2"/><path d="M215.39 92.94A8 8 0 0 0 208 88H48a8 8 0 0 0-5.66 13.66l80 80a8 8 0 0 0 11.32 0l80-80a8 8 0 0 0 1.73-8.72M128 164.69L67.31 104h121.38Z"/></g></svg></span>
      2 replies
    </button>
    <div class="ct__fold" id="ct-re">
      <div class="ct__inner">
        <ul class="ct__list" role="log" aria-live="polite" id="ct-list">
          <li class="ct__rep" data-row="1">
            <span class="ct__av ct__av--s" style="--a:#ff9ebb">L</span>
            <p class="ct__txt"><b>Lee Jun</b>  It's at the bottom of the release notes</p>
            <time class="ct__tm">50m ago</time>
          </li>
          <li class="ct__rep ct__rep--old" data-row="2">
            <span class="ct__av ct__av--s" style="--a:#c3d6e2">C</span>
            <p class="ct__txt"><b>Choi Do-yun</b>  It's on the dashboard notice too</p>
            <time class="ct__tm">42m ago</time>
          </li>
          <li class="ct__rep ct__rep--new" data-row="new">
            <div class="ct__rfold"><div class="ct__rcell">
              <span class="ct__av ct__av--s" style="--a:#93a4ca">K</span>
              <p class="ct__txt"><b>Kim Haneul</b>  I'll share the schedule link too</p>
              <time class="ct__tm">now</time>
            </div></div>
          </li>
        </ul>
        <button class="ct__add" type="button" id="ct-add">Reply</button>
      </div>
    </div>
  </section>
</main>
<template id="ct-tpl"><li class="ct__rep is-in"><div class="ct__rfold"><div class="ct__rcell">
  <span class="ct__av ct__av--s" style="--a:#b9a0ff">H</span>
  <p class="ct__txt"><b>Han Byeol</b>  I'll post the deck soon too</p>
  <time class="ct__tm">now</time>
</div></div></li></template>

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

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

@include stage($stage-paper);

$line: color.mix($subject-ink, $stage-paper, 14%);
$soft: color.mix($subject-blue, $stage-paper, 6%);

.ct {
  box-sizing: border-box;
  width: min(304px, 92vw);
  padding: $sp-3;
  border: 1px solid $line;
  border-radius: $r-card;
  background: $stage-paper;
  color: $subject-ink;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 12px;
  line-height: 1.3;
}

// ── 원댓글 ────────────────────────────────────────
.ct__top {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: $sp-2;
  padding: $sp-1 $sp-2;
  border: 1px solid $line;
  border-radius: $r-sm;
  background: $soft;
}
.ct__av {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--a);
  color: $subject-ink;
  font-size: 11px;
  font-weight: 700;
}
.ct__av--s { width: 16px; height: 16px; font-size: 10px; }
.ct__body { min-width: 0; }
.ct__txt { margin: 0; font-size: 12px; line-height: 1.35; }
.ct__txt b { font-weight: 700; }
.ct__tm { display: block; margin-top: 0; color: rgba(23, 20, 26, .72); font-size: 10px; }

// ── 답글 토글 ─────────────────────────────────────
.ct__tg {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin: $sp-1 0 0 $sp-3;
  padding: 0 $sp-2;
  border: 0;
  border-radius: $r-pill;
  background: transparent;
  color: $color;
  font-family: inherit;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.7;
  cursor: pointer;
}
.ct__tg:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
.ct__caret { display: inline-flex; width: 11px; height: 11px; transform: rotate(-90deg); transition: transform $duration $easing; }
.ct__tg.is-open .ct__caret { transform: rotate(0deg); }

// ── 답글 뭉치 — grid-template-rows 로 접는다 ────────
.ct__fold {
  display: grid;
  grid-template-rows: 0fr;
  margin-left: $sp-3;
  transition: grid-template-rows $dur-base $easing;
}
.ct__fold.is-open { grid-template-rows: 1fr; }
.ct__inner { min-height: 0; overflow: hidden; }

.ct__list {
  display: grid;
  gap: $sp-1;
  margin: $sp-1 0 0;
  padding: 0;
  list-style: none;
}
.ct__rep {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: $sp-2;
  padding: $sp-1 $sp-2;
  border: 1px dashed $line;
  border-radius: $r-sm;
  background: $stage-paper;
}
.ct__rep .ct__tm { margin: 0; }

// 새 답글의 자리 — 접혀 있다가 자란다
.ct__rep--new, .ct__rep.is-in { display: block; }
.ct__rfold { display: grid; grid-template-rows: 1fr; }
.ct__rep--new .ct__rfold,
.ct__rep.is-in .ct__rfold { grid-template-rows: 0fr; }
.ct__rep.is-grow .ct__rfold { grid-template-rows: 1fr; transition: grid-template-rows $dur-base $easing; }
.ct__rcell {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: $sp-2;
  min-height: 0;
  overflow: hidden;
}

// 사람이 눌러 넣은 답글: 아래에서 살짝 떠오른다 (is-in 동안만)
.ct__rep.is-in { border-style: solid; border-color: $color; }
.ct__rep.is-in .ct__rcell { animation: ct-rise $dur-base $ease-pop both; }
@keyframes ct-rise {
  from { transform: translateY(8px); }
  to { transform: translateY(0); }
}

.ct__add {
  display: inline-flex;
  align-items: center;
  margin: $sp-2 0 0;
  padding: $sp-1 $sp-3;
  border: 1px solid $line;
  border-radius: $r-pill;
  background: $stage-paper;
  color: $subject-ink;
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.6;
  cursor: pointer;
}
.ct__add:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

// ── 격자 미리보기 전용 2초 루프 ─────────────────────
@keyframes ct-fold-open {
  0%, 14% { grid-template-rows: 0fr; }
  22%, 86% { grid-template-rows: 1fr; }
  87%, 100% { grid-template-rows: 0fr; }
}
@keyframes ct-caret-turn {
  0%, 14% { transform: rotate(-90deg); }
  19%, 86% { transform: rotate(0deg); }
  87%, 100% { transform: rotate(-90deg); }
}
@keyframes ct-new-grow {
  0%, 54% { grid-template-rows: 0fr; }
  55% { grid-template-rows: 1fr; }
  55.1%, 86% { grid-template-rows: 1fr; }
  87%, 100% { grid-template-rows: 0fr; }
}
@keyframes ct-new-rise {
  0%, 55% { transform: translateY(8px); }
  62%, 86% { transform: translateY(0); }
  87%, 100% { transform: translateY(8px); }
}
@keyframes ct-new-pop {
  0%, 55% { transform: scale(.4); }
  61%, 86% { transform: scale(1); }
  87%, 100% { transform: scale(.4); }
}
@keyframes ct-add-breath {
  0%, 54% { transform: translateY(0); }
  59% { transform: translateY(-2px); }
  64%, 86% { transform: translateY(0); }
  87%, 100% { transform: translateY(0); }
}

.ct.is-demo {
  .ct__fold {
    animation-name: ct-fold-open;
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  .ct__caret {
    animation-name: ct-caret-turn;
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  .ct__rep--new .ct__rfold {
    animation-name: ct-new-grow;
    animation-duration: $dur-loop;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .ct__rep--new .ct__rcell {
    animation-name: ct-new-rise;
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  .ct__rep--new .ct__av {
    animation-name: ct-new-pop;
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  .ct__rep--new { border-style: solid; border-color: $color; }
  .ct__add {
    animation-name: ct-add-breath;
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
}

@media (max-width: 340px) {
  .ct { padding: $sp-2; font-size: 11px; }
  .ct__txt { font-size: 11px; }
  .ct__rep { padding: 0 $sp-2; }
  .ct__rep--old { display: none; } // 좁은 화면에서는 오래된 답글부터 비운다
  .ct__fold { margin-left: $sp-2; }
  .ct__tg { margin-left: $sp-2; }
  .ct__add { margin-top: $sp-1; padding: 0 $sp-3; }
}

@media (prefers-reduced-motion: reduce) {
  .ct__fold { transition: none; }
  .ct__caret { transition: none; }
  .ct__rep.is-in .ct__rcell { animation: none !important; }
  .ct.is-demo .ct__fold,
  .ct.is-demo .ct__caret,
  .ct.is-demo .ct__rep--new .ct__rfold,
  .ct.is-demo .ct__rep--new .ct__rcell,
  .ct.is-demo .ct__rep--new .ct__av,
  .ct.is-demo .ct__add { animation: none !important; transform: none !important; }
  // 움직임만 끄고 결과 상태는 남긴다 — 답글은 펼쳐진 채 새 답글까지
  .ct.is-demo .ct__fold { grid-template-rows: 1fr !important; }
  .ct.is-demo .ct__caret { transform: rotate(0deg) !important; }
  .ct.is-demo .ct__rep--new .ct__rfold { grid-template-rows: 1fr !important; }
  .ct.is-demo .ct__rep--new .ct__av { transform: scale(1) !important; }
}

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);
}

.ct {
  box-sizing: border-box;
  width: min(304px, 92vw);
  padding: 12px;
  border: 1px solid rgb(87.262745098%, 87.0980392157%, 87.4274509804%);
  border-radius: 16px;
  background: #ffffff;
  color: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 12px;
  line-height: 1.3;
}

.ct__top {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px;
  padding: 4px 8px;
  border: 1px solid rgb(87.262745098%, 87.0980392157%, 87.4274509804%);
  border-radius: 8px;
  background: rgb(95.1058823529%, 96.5647058824%, 99.7882352941%);
}

.ct__av {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--a);
  color: #17141a;
  font-size: 11px;
  font-weight: 700;
}

.ct__av--s {
  width: 16px;
  height: 16px;
  font-size: 10px;
}

.ct__body {
  min-width: 0;
}

.ct__txt {
  margin: 0;
  font-size: 12px;
  line-height: 1.35;
}

.ct__txt b {
  font-weight: 700;
}

.ct__tm {
  display: block;
  margin-top: 0;
  color: rgba(23, 20, 26, 0.72);
  font-size: 10px;
}

.ct__tg {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin: 4px 0 0 12px;
  padding: 0 8px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: #2f6df6;
  font-family: inherit;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.7;
  cursor: pointer;
}

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

.ct__caret {
  display: inline-flex;
  width: 11px;
  height: 11px;
  transform: rotate(-90deg);
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.ct__tg.is-open .ct__caret {
  transform: rotate(0deg);
}

.ct__fold {
  display: grid;
  grid-template-rows: 0fr;
  margin-left: 12px;
  transition: grid-template-rows 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.ct__fold.is-open {
  grid-template-rows: 1fr;
}

.ct__inner {
  min-height: 0;
  overflow: hidden;
}

.ct__list {
  display: grid;
  gap: 4px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.ct__rep {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  border: 1px dashed rgb(87.262745098%, 87.0980392157%, 87.4274509804%);
  border-radius: 8px;
  background: #ffffff;
}

.ct__rep .ct__tm {
  margin: 0;
}

.ct__rep--new, .ct__rep.is-in {
  display: block;
}

.ct__rfold {
  display: grid;
  grid-template-rows: 1fr;
}

.ct__rep--new .ct__rfold,
.ct__rep.is-in .ct__rfold {
  grid-template-rows: 0fr;
}

.ct__rep.is-grow .ct__rfold {
  grid-template-rows: 1fr;
  transition: grid-template-rows 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.ct__rcell {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 8px;
  min-height: 0;
  overflow: hidden;
}

.ct__rep.is-in {
  border-style: solid;
  border-color: #2f6df6;
}

.ct__rep.is-in .ct__rcell {
  animation: ct-rise 300ms cubic-bezier(0.2, 1.4, 0.4, 1) both;
}

@keyframes ct-rise {
  from {
    transform: translateY(8px);
  }
  to {
    transform: translateY(0);
  }
}
.ct__add {
  display: inline-flex;
  align-items: center;
  margin: 8px 0 0;
  padding: 4px 12px;
  border: 1px solid rgb(87.262745098%, 87.0980392157%, 87.4274509804%);
  border-radius: 999px;
  background: #ffffff;
  color: #17141a;
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.6;
  cursor: pointer;
}

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

@keyframes ct-fold-open {
  0%, 14% {
    grid-template-rows: 0fr;
  }
  22%, 86% {
    grid-template-rows: 1fr;
  }
  87%, 100% {
    grid-template-rows: 0fr;
  }
}
@keyframes ct-caret-turn {
  0%, 14% {
    transform: rotate(-90deg);
  }
  19%, 86% {
    transform: rotate(0deg);
  }
  87%, 100% {
    transform: rotate(-90deg);
  }
}
@keyframes ct-new-grow {
  0%, 54% {
    grid-template-rows: 0fr;
  }
  55% {
    grid-template-rows: 1fr;
  }
  55.1%, 86% {
    grid-template-rows: 1fr;
  }
  87%, 100% {
    grid-template-rows: 0fr;
  }
}
@keyframes ct-new-rise {
  0%, 55% {
    transform: translateY(8px);
  }
  62%, 86% {
    transform: translateY(0);
  }
  87%, 100% {
    transform: translateY(8px);
  }
}
@keyframes ct-new-pop {
  0%, 55% {
    transform: scale(0.4);
  }
  61%, 86% {
    transform: scale(1);
  }
  87%, 100% {
    transform: scale(0.4);
  }
}
@keyframes ct-add-breath {
  0%, 54% {
    transform: translateY(0);
  }
  59% {
    transform: translateY(-2px);
  }
  64%, 86% {
    transform: translateY(0);
  }
  87%, 100% {
    transform: translateY(0);
  }
}
.ct.is-demo .ct__fold {
  animation-name: ct-fold-open;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.ct.is-demo .ct__caret {
  animation-name: ct-caret-turn;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.ct.is-demo .ct__rep--new .ct__rfold {
  animation-name: ct-new-grow;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.ct.is-demo .ct__rep--new .ct__rcell {
  animation-name: ct-new-rise;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.ct.is-demo .ct__rep--new .ct__av {
  animation-name: ct-new-pop;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.ct.is-demo .ct__rep--new {
  border-style: solid;
  border-color: #2f6df6;
}
.ct.is-demo .ct__add {
  animation-name: ct-add-breath;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

@media (max-width: 340px) {
  .ct {
    padding: 8px;
    font-size: 11px;
  }
  .ct__txt {
    font-size: 11px;
  }
  .ct__rep {
    padding: 0 8px;
  }
  .ct__rep--old {
    display: none;
  }
  .ct__fold {
    margin-left: 8px;
  }
  .ct__tg {
    margin-left: 8px;
  }
  .ct__add {
    margin-top: 4px;
    padding: 0 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ct__fold {
    transition: none;
  }
  .ct__caret {
    transition: none;
  }
  .ct__rep.is-in .ct__rcell {
    animation: none !important;
  }
  .ct.is-demo .ct__fold,
  .ct.is-demo .ct__caret,
  .ct.is-demo .ct__rep--new .ct__rfold,
  .ct.is-demo .ct__rep--new .ct__rcell,
  .ct.is-demo .ct__rep--new .ct__av,
  .ct.is-demo .ct__add {
    animation: none !important;
    transform: none !important;
  }
  .ct.is-demo .ct__fold {
    grid-template-rows: 1fr !important;
  }
  .ct.is-demo .ct__caret {
    transform: rotate(0deg) !important;
  }
  .ct.is-demo .ct__rep--new .ct__rfold {
    grid-template-rows: 1fr !important;
  }
  .ct.is-demo .ct__rep--new .ct__av {
    transform: scale(1) !important;
  }
}

// 실제 동작: 2 replies 토글은 접힘·펼침을 바꾸고(aria-expanded),
// 댓글 달기는 답글 칸 맨 아래에 새 댓글을 자라나게 한다 (등장만).
var ct = document.getElementById('ct');
var ctTg = document.getElementById('ct-tg');
var ctRe = document.getElementById('ct-re');
var ctList = document.getElementById('ct-list');
function ctOpen(on) {
  ctRe.classList.toggle('is-open', on);
  ctTg.setAttribute('aria-expanded', on ? 'true' : 'false');
  ctTg.classList.toggle('is-open', on);
}
ctTg.addEventListener('click', function () {
  ct.classList.remove('is-demo');
  ctOpen(!ctRe.classList.contains('is-open'));
});
document.getElementById('ct-add').addEventListener('click', function () {
  ct.classList.remove('is-demo');
  ctOpen(true);
  var row = document.getElementById('ct-tpl').content.firstElementChild.cloneNode(true);
  ctList.appendChild(row);
  void row.offsetWidth; // 두 단계로 나눠야 grid 전환이 애니메이션으로 잡힌다
  row.classList.add('is-grow'); // is-in 은 그대로 — 새 답글 표시(테두리)로 남긴다
});

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

export type CommentThreadMiniProps = {
  groupLabel?: string;
  topName?: string;
  topText?: string;
  topTm?: string;
  repliesLabel?: string;
  addLabel?: string;
  nowLabel?: string;
  replies?: { key: number; name: string; initial: string; av: string; text: string }[];
  demo?: boolean;
  duration?: number;
  easing?: string;
  color?: string;
};

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

function CaretIcon() {
  return (
    <svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor">
      <g>
        <path d="m208 96l-80 80l-80-80Z" opacity=".2" />
        <path d="M215.39 92.94A8 8 0 0 0 208 88H48a8 8 0 0 0-5.66 13.66l80 80a8 8 0 0 0 11.32 0l80-80a8 8 0 0 0 1.73-8.72M128 164.69L67.31 104h121.38Z" />
      </g>
    </svg>
  );
}

const DEFAULT_REPLIES = [
  { key: 1, name: "Lee Jun", initial: "L", av: "#ff9ebb", text: " It's at the bottom of the release notes" },
  { key: 2, name: "Choi Do-yun", initial: "C", av: "#6ec8ff", text: " It's on the dashboard notice too" },
];

export default function CommentThreadMini({
  groupLabel = "Comment thread",
  topName = "Park Seo-a",
  topText = " Where can I see the new release schedule?",
  topTm = "1h ago",
  repliesLabel = "2 replies",
  addLabel = "Reply",
  nowLabel = "now",
  replies = DEFAULT_REPLIES,
  demo = true,
  duration = 220,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: CommentThreadMiniProps) {
  const [live, setLive] = useState(demo);
  const [open, setOpen] = useState(false);
  const [rows, setRows] = useState(replies);
  const [grown, setGrown] = useState<number[]>([]);

  // 방금 넣은 답글은 두 단계(shut → grow)로 렌더해야 grid 전환이 애니메이션으로 잡힌다
  const last = rows[rows.length - 1];
  useEffect(() => {
    if (last && !grown.includes(last.key)) {
      const raf = requestAnimationFrame(() => setGrown((g) => [...g, last.key]));
      return () => cancelAnimationFrame(raf);
    }
  }, [rows, grown, last]);

  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  function toggle() {
    setLive(false);
    setOpen((o) => !o);
  }

  function add() {
    setLive(false);
    setOpen(true);
    setRows((r) => [...r, { key: Date.now(), name: "Han Byeol", initial: "H", av: "#b9a0ff", text: " I'll post the deck soon too" }]);
  }

  const cls = [styles.ct, live ? styles.isDemo : ""].filter(Boolean).join(" ");

  return (
    <section className={cls} style={vars} aria-label={groupLabel}>
      <article className={styles.top}>
        <span className={styles.av} style={{ background: "#4cd4a6" }}>P</span>
        <div className={styles.body}>
          <p className={styles.txt}><b>{topName}</b>{topText}</p>
          <time className={styles.tm}>{topTm}</time>
        </div>
      </article>
      <button
        className={[styles.tg, open ? styles.tgOpen : ""].filter(Boolean).join(" ")}
        type="button"
        aria-expanded={open}
        onClick={toggle}
      >
        <span className={styles.caret} aria-hidden="true"><CaretIcon /></span>
        {repliesLabel}
      </button>
      <div className={[styles.fold, open ? styles.foldOpen : ""].filter(Boolean).join(" ")}>
        <div className={styles.inner}>
          <ul className={styles.list} role="log" aria-live="polite">
            {rows.map((r, i) => {
              const isNew = r === last && !grown.includes(r.key);
              const rowCls = [
                styles.rep,
                i === 0 ? styles.rep1 : "",
                i === 1 && rows.length > 2 ? styles.repOld : "",
                !isNew ? styles.grow : "",
                isNew ? styles.shut : "",
              ].filter(Boolean).join(" ");
              return (
                <li key={r.key} className={rowCls}>
                  <div className={styles.rfold}>
                    <div className={styles.rcell}>
                      <span className={styles.avS} style={{ background: r.av }}>{r.initial}</span>
                      <p className={styles.txt}><b>{r.name}</b>{r.text}</p>
                      <time className={styles.tm}>{r === last ? nowLabel : "50m ago"}</time>
                    </div>
                  </div>
                </li>
              );
            })}
            <li className={styles.repNew}>
              <div className={styles.rfold}>
                <div className={styles.rcell}>
                  <span className={styles.avS} style={{ background: "#2f6df6" }}>K</span>
                  <p className={styles.txt}><b>Kim Haneul</b> I'll share the schedule link too</p>
                  <time className={styles.tm}>{nowLabel}</time>
                </div>
              </div>
            </li>
          </ul>
          <button className={styles.add} type="button" onClick={add}>{addLabel}</button>
        </div>
      </div>
    </section>
  );
}