08分と秒を上げると輪が回るカウントダウン

<main class="stage">
  <div class="cd is-demo">
    <div class="cd__ring" id="cd-ring">
      <span class="cd__hole">
        <span class="cd__num" id="cd-num">05:00</span>
        <span class="cd__f" data-k="1">05:00</span>
        <span class="cd__f" data-k="2">03:45</span>
        <span class="cd__f" data-k="3">02:30</span>
      </span>
    </div>

    <div class="cd__side">
      <span class="cd__cap">タイマーの長さ</span>

      <div class="cd__field">
        <button class="cd__step" type="button" data-t="min" data-d="-1" aria-label="分を下げる"><svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><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></button>
        <span class="cd__val" role="spinbutton" tabindex="0" id="cd-min" data-t="min" aria-label="分" aria-valuemin="0" aria-valuemax="59" aria-valuenow="5" aria-valuetext="5分"><b class="cd__n" id="cd-min-n">05</b><i class="cd__u">分</i></span>
        <button class="cd__step" type="button" data-t="min" data-d="1" aria-label="分を上げる"><svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><path d="M208 160H48l80-80Z" opacity=".2"/><path d="m213.66 154.34l-80-80a8 8 0 0 0-11.32 0l-80 80A8 8 0 0 0 48 168h160a8 8 0 0 0 5.66-13.66M67.31 152L128 91.31L188.69 152Z"/></g></svg></button>
      </div>

      <div class="cd__field">
        <button class="cd__step" type="button" data-t="sec" data-d="-1" aria-label="秒を下げる"><svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><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></button>
        <span class="cd__val" role="spinbutton" tabindex="0" id="cd-sec" data-t="sec" aria-label="秒" aria-valuemin="0" aria-valuemax="55" aria-valuenow="0" aria-valuetext="0秒"><b class="cd__n" id="cd-sec-n">00</b><i class="cd__u">秒</i></span>
        <button class="cd__step" type="button" data-t="sec" data-d="1" aria-label="秒を上げる"><svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><path d="M208 160H48l80-80Z" opacity=".2"/><path d="m213.66 154.34l-80-80a8 8 0 0 0-11.32 0l-80 80A8 8 0 0 0 48 168h160a8 8 0 0 0 5.66-13.66M67.31 152L128 91.31L188.69 152Z"/></g></svg></button>
      </div>

      <button class="cd__go" type="button" id="cd-go">開始</button>
    </div>

    <span class="cd__tpl" data-k="min" hidden>{n}分</span>
    <span class="cd__tpl" data-k="sec" hidden>{n}秒</span>
  </div>
</main>

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

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

@include stage($stage-paper);

// 등록하지 않은 커스텀 속성은 보간되지 않는다 — 각도를 애니메이션하려면 이 선언이 먼저다
@property --ring-angle {
  syntax: "<angle>";
  inherits: false;
  initial-value: 360deg;
}

.cd {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: $sp-5;
  color: $subject-ink;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

// ── 둘레 링: conic-gradient 한 장 + 가운데 구멍 ──────────
.cd__ring {
  position: relative;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 124px;
  height: 124px;
  border-radius: 50%;
  background: conic-gradient($color 0deg var(--ring-angle), rgba($subject-ink, .14) var(--ring-angle) 360deg);
}
.cd__hole {
  display: grid;
  place-items: center;
  width: 94px;
  height: 94px;
  border-radius: 50%;
  background-color: $stage-paper;
}
.cd__num,
.cd__f {
  grid-area: 1 / 1;
  font-size: 26px;
  line-height: 30px;
  font-weight: 800;
  letter-spacing: .01em;
  font-variant-numeric: tabular-nums;
}
// 루프 전용 숫자 석 장 — 사람이 조작하면 위의 실제 값이 다시 보인다
.cd__f { display: none; }
.cd.is-demo .cd__f { display: block; }
.cd.is-demo .cd__num { display: none; }

// ── 분·초 칸 ────────────────────────────────────────────
.cd__side {
  display: flex;
  flex-direction: column;
  gap: $sp-2;
}
.cd__cap {
  font-size: 11px;
  line-height: 14px;
  font-weight: 600;
  color: rgba($subject-ink, .62);
}
.cd__field {
  display: flex;
  align-items: center;
  gap: $sp-1;
}
.cd__step {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0;
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: $r-sm;
  background-color: rgba($subject-ink, .08);
  color: $subject-ink;
  cursor: pointer;
}
.cd__step:focus-visible,
.cd__val:focus-visible,
.cd__go:focus-visible { outline: 3px solid $color; outline-offset: 2px; }
.cd__step svg { display: block; }

.cd__val {
  box-sizing: border-box;
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: $sp-1;
  padding: $sp-1 $sp-2;
  min-width: 66px;
  border-radius: $r-sm;
  background-color: rgba($color, .1);
  cursor: ns-resize;
}
.cd__n {
  font-size: 20px;
  line-height: 24px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.cd__u {
  font-size: 11px;
  line-height: 14px;
  font-weight: 700;
  font-style: normal;
  color: rgba($subject-ink, .72);
}

.cd__go {
  box-sizing: border-box;
  margin: 0;
  padding: $sp-1 $sp-4;
  border: 0;
  border-radius: $r-pill;
  background-color: $color;
  color: $stage-paper;
  font-family: inherit;
  font-size: 13px;
  line-height: 20px;
  font-weight: 700;
  cursor: pointer;
}

.cd__tpl { display: none; }

// ── 자동 루프: 링은 이어서 줄고, 숫자는 한 프레임에 컷 ──
// 다 닳아서 비는 프레임이 없도록 72deg 에서 멈추고, 되감기는 여러 프레임으로 나눠 돌린다
.cd.is-demo .cd__ring {
  animation-name: cd-drain;
  animation-duration: $dur-loop;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
@keyframes cd-drain {
  0%   { --ring-angle: 360deg; }
  62%  { --ring-angle: 72deg; }
  86%  { --ring-angle: 360deg; }
  100% { --ring-angle: 360deg; }
}

.cd.is-demo .cd__f {
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
.cd.is-demo .cd__f[data-k="1"] { animation-name: cd-n1; }
.cd.is-demo .cd__f[data-k="2"] { animation-name: cd-n2; }
.cd.is-demo .cd__f[data-k="3"] { animation-name: cd-n3; }
@keyframes cd-n1 {
  0%   { opacity: 1; }
  21%  { opacity: 0; }
  62%  { opacity: 1; }
  100% { opacity: 1; }
}
@keyframes cd-n2 {
  0%   { opacity: 0; }
  21%  { opacity: 1; }
  41%  { opacity: 0; }
  100% { opacity: 0; }
}
@keyframes cd-n3 {
  0%   { opacity: 0; }
  41%  { opacity: 1; }
  62%  { opacity: 0; }
  100% { opacity: 0; }
}

// 시작 버튼이 한 번 눌렸다 펴지며 루프의 출발을 알린다
.cd.is-demo .cd__go {
  animation-name: cd-press;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
@keyframes cd-press {
  0%   { transform: scale(.92); }
  8%   { transform: scale(1.04); }
  16%  { transform: scale(1); }
  100% { transform: scale(1); }
}

@media (max-width: 340px) {
  .cd { gap: $sp-3; }
  .cd__ring { width: 100px; height: 100px; }
  .cd__hole { width: 76px; height: 76px; }
  .cd__num,
  .cd__f { font-size: 20px; line-height: 24px; }
  .cd__val { min-width: 56px; padding: 0 $sp-1; gap: 0; }
  .cd__n { font-size: 17px; line-height: 22px; }
  .cd__step { width: 24px; height: 24px; }
  .cd__go { padding: $sp-1 $sp-3; font-size: 12px; line-height: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  .cd.is-demo .cd__ring,
  .cd.is-demo .cd__f,
  .cd.is-demo .cd__go { animation: none !important; }
  .cd.is-demo .cd__f[data-k="2"],
  .cd.is-demo .cd__f[data-k="3"] { display: none; }
}

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);
}

@property --ring-angle {
  syntax: "<angle>";
  inherits: false;
  initial-value: 360deg;
}
.cd {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 20px;
  color: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.cd__ring {
  position: relative;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 124px;
  height: 124px;
  border-radius: 50%;
  background: conic-gradient(#2f6df6 0deg var(--ring-angle), rgba(23, 20, 26, 0.14) var(--ring-angle) 360deg);
}

.cd__hole {
  display: grid;
  place-items: center;
  width: 94px;
  height: 94px;
  border-radius: 50%;
  background-color: #ffffff;
}

.cd__num,
.cd__f {
  grid-area: 1/1;
  font-size: 26px;
  line-height: 30px;
  font-weight: 800;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
}

.cd__f {
  display: none;
}

.cd.is-demo .cd__f {
  display: block;
}

.cd.is-demo .cd__num {
  display: none;
}

.cd__side {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cd__cap {
  font-size: 11px;
  line-height: 14px;
  font-weight: 600;
  color: rgba(23, 20, 26, 0.62);
}

.cd__field {
  display: flex;
  align-items: center;
  gap: 4px;
}

.cd__step {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0;
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: 8px;
  background-color: rgba(23, 20, 26, 0.08);
  color: #17141a;
  cursor: pointer;
}

.cd__step:focus-visible,
.cd__val:focus-visible,
.cd__go:focus-visible {
  outline: 3px solid #2f6df6;
  outline-offset: 2px;
}

.cd__step svg {
  display: block;
}

.cd__val {
  box-sizing: border-box;
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  padding: 4px 8px;
  min-width: 66px;
  border-radius: 8px;
  background-color: rgba(47, 109, 246, 0.1);
  cursor: ns-resize;
}

.cd__n {
  font-size: 20px;
  line-height: 24px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.cd__u {
  font-size: 11px;
  line-height: 14px;
  font-weight: 700;
  font-style: normal;
  color: rgba(23, 20, 26, 0.72);
}

.cd__go {
  box-sizing: border-box;
  margin: 0;
  padding: 4px 16px;
  border: 0;
  border-radius: 999px;
  background-color: #2f6df6;
  color: #ffffff;
  font-family: inherit;
  font-size: 13px;
  line-height: 20px;
  font-weight: 700;
  cursor: pointer;
}

.cd__tpl {
  display: none;
}

.cd.is-demo .cd__ring {
  animation-name: cd-drain;
  animation-duration: 2s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes cd-drain {
  0% {
    --ring-angle: 360deg;
  }
  62% {
    --ring-angle: 72deg;
  }
  86% {
    --ring-angle: 360deg;
  }
  100% {
    --ring-angle: 360deg;
  }
}
.cd.is-demo .cd__f {
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

.cd.is-demo .cd__f[data-k="1"] {
  animation-name: cd-n1;
}

.cd.is-demo .cd__f[data-k="2"] {
  animation-name: cd-n2;
}

.cd.is-demo .cd__f[data-k="3"] {
  animation-name: cd-n3;
}

@keyframes cd-n1 {
  0% {
    opacity: 1;
  }
  21% {
    opacity: 0;
  }
  62% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes cd-n2 {
  0% {
    opacity: 0;
  }
  21% {
    opacity: 1;
  }
  41% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@keyframes cd-n3 {
  0% {
    opacity: 0;
  }
  41% {
    opacity: 1;
  }
  62% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
.cd.is-demo .cd__go {
  animation-name: cd-press;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes cd-press {
  0% {
    transform: scale(0.92);
  }
  8% {
    transform: scale(1.04);
  }
  16% {
    transform: scale(1);
  }
  100% {
    transform: scale(1);
  }
}
@media (max-width: 340px) {
  .cd {
    gap: 12px;
  }
  .cd__ring {
    width: 100px;
    height: 100px;
  }
  .cd__hole {
    width: 76px;
    height: 76px;
  }
  .cd__num,
  .cd__f {
    font-size: 20px;
    line-height: 24px;
  }
  .cd__val {
    min-width: 56px;
    padding: 0 4px;
    gap: 0;
  }
  .cd__n {
    font-size: 17px;
    line-height: 22px;
  }
  .cd__step {
    width: 24px;
    height: 24px;
  }
  .cd__go {
    padding: 4px 12px;
    font-size: 12px;
    line-height: 18px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cd.is-demo .cd__ring,
  .cd.is-demo .cd__f,
  .cd.is-demo .cd__go {
    animation: none !important;
  }
  .cd.is-demo .cd__f[data-k="2"],
  .cd.is-demo .cd__f[data-k="3"] {
    display: none;
  }
}

// 실제 동작: 分·秒 칸은 진짜 spinbutton 이라 ↑↓ 로 값이 오르내리고(分 1, 秒 5), 시작을 누르면
// 남은 비율이 --ring-angle 로 나간다. 이 커스텀 속성은 @property 로 등록돼 있어야 각도가 보간된다
var root = document.querySelector('.cd');
var ringEl = document.getElementById('cd-ring');
var num = document.getElementById('cd-num');
var V = { min: 5, sec: 0 }, STEP = { min: 1, sec: 5 }, MAX = { min: 59, sec: 55 };
var timer = null;
function pad(n) { return (n < 10 ? '0' : '') + n; }
function tpl(k, n) { return root.querySelector('.cd__tpl[data-k="' + k + '"]').textContent.replace('{n}', String(n)); }
function show(s) { num.textContent = pad(Math.floor(s / 60)) + ':' + pad(s % 60); }
function ring(f) { ringEl.style.setProperty('--ring-angle', (360 * f).toFixed(1) + 'deg'); }
function stop() { if (timer) { clearInterval(timer); timer = null; } }
function paint() {
  ['min', 'sec'].forEach(function (k) {
    var el = document.getElementById('cd-' + k);
    el.setAttribute('aria-valuenow', String(V[k]));
    el.setAttribute('aria-valuetext', tpl(k, V[k]));       // 읽히는 값은 숫자가 아니라 사람 말이다
    document.getElementById('cd-' + k + '-n').textContent = pad(V[k]);
  });
  show(V.min * 60 + V.sec);
  ring(1);
}
function bump(k, d) {
  root.classList.remove('is-demo'); stop();
  V[k] = Math.max(0, Math.min(MAX[k], V[k] + d * STEP[k]));
  paint();
}
function start() {
  root.classList.remove('is-demo'); stop();
  var total = V.min * 60 + V.sec, left = total;
  if (!total) return;
  timer = setInterval(function () {
    left -= 1; show(left); ring(left / total);
    if (left <= 0) stop();
  }, 1000);
}
root.addEventListener('click', function (e) {
  var b = e.target.closest('.cd__step');
  if (b) { bump(b.getAttribute('data-t'), Number(b.getAttribute('data-d'))); return; }
  if (e.target.closest('.cd__go')) start();
});
root.addEventListener('keydown', function (e) {
  var s = e.target.closest('[role="spinbutton"]');
  if (!s) return;
  var k = s.getAttribute('data-t');
  var d = e.key === 'ArrowUp' ? 1 : e.key === 'ArrowDown' ? -1 : 0;
  if (d) { e.preventDefault(); bump(k, d); return; }
  if (e.key === 'Home' || e.key === 'End') {
    e.preventDefault(); root.classList.remove('is-demo'); stop();
    V[k] = e.key === 'Home' ? 0 : MAX[k]; paint();
  }
});

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

type KeyEvt = { key: string; preventDefault(): void };
type Box<T> = { current: T };
type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type RingVars = CSSProperties & { "--ring-angle"?: string };
type Unit = "min" | "sec";

export type CountdownRingSetterProps = {
  minutes?: number;
  seconds?: number;
  labels?: {
    cap: string;
    start: string;
    min: string;
    sec: string;
    minUp: string;
    minDown: string;
    secUp: string;
    secDown: string;
    minUnit: string;
    secUnit: string;
  };
  /** {n} 자리에 값이 들어가는 aria-valuetext 틀 */
  valueText?: { min: string; sec: string };
  /** 격자 미리보기(.isDemo) 루프에서만 보이는 숫자 석 장 */
  demoFrames?: [string, string, string];
  duration?: number;
  easing?: string;
  color?: string;
};

const STEP: { min: number; sec: number } = { min: 1, sec: 5 };
const MAX: { min: number; sec: number } = { min: 59, sec: 55 };

const CARET_DOWN = (
  <g fill="currentColor">
    <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>
);
const CARET_UP = (
  <g fill="currentColor">
    <path d="M208 160H48l80-80Z" opacity=".2" />
    <path d="m213.66 154.34l-80-80a8 8 0 0 0-11.32 0l-80 80A8 8 0 0 0 48 168h160a8 8 0 0 0 5.66-13.66M67.31 152L128 91.31L188.69 152Z" />
  </g>
);

function pad(n: number) {
  return (n < 10 ? "0" : "") + n;
}

export default function CountdownRingSetter({
  minutes = 5,
  seconds = 0,
  labels = {
    cap: "Timer length",
    start: "Start",
    min: "minutes",
    sec: "seconds",
    minUp: "minutes up",
    minDown: "minutes down",
    secUp: "seconds up",
    secDown: "seconds down",
    minUnit: "m",
    secUnit: "s",
  },
  valueText = { min: "{n} minutes", sec: "{n} seconds" },
  demoFrames = ["05:00", "03:45", "02:30"],
  duration = 300,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: CountdownRingSetterProps) {
  const [demo, setDemo] = useState(true);
  const [v, setV] = useState({ min: minutes, sec: seconds });
  const [left, setLeft] = useState<number | null>(null);
  const timer = useRef<number | null>(null) as Box<number | null>;

  const total = v.min * 60 + v.sec;
  const shown = left === null ? total : left;
  // 남은 비율이 그대로 각도가 된다 — @property 로 등록된 값이라야 이 각도가 보간된다
  const angle = left === null || total === 0 ? 360 : (left / total) * 360;
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const ringVars: RingVars = { "--ring-angle": `${angle.toFixed(1)}deg` };

  function stop() {
    if (timer.current !== null) {
      window.clearInterval(timer.current);
      timer.current = null;
    }
  }

  function set(k: Unit, n: number) {
    setDemo(false);
    stop();
    setLeft(null);
    const c = Math.max(0, Math.min(MAX[k], n));
    setV((p) => (k === "min" ? { min: c, sec: p.sec } : { min: p.min, sec: c }));
  }

  function bump(k: Unit, d: number) {
    set(k, v[k] + d * STEP[k]);
  }

  function start() {
    setDemo(false);
    stop();
    if (!total) return;
    setLeft(total);
    timer.current = window.setInterval(() => {
      setLeft((p) => {
        const n = (p === null ? total : p) - 1;
        if (n <= 0) stop();
        return n < 0 ? 0 : n;
      });
    }, 1000);
  }

  function onKey(e: KeyEvt, k: Unit) {
    const d = e.key === "ArrowUp" ? 1 : e.key === "ArrowDown" ? -1 : 0;
    if (d) {
      e.preventDefault();
      bump(k, d);
      return;
    }
    if (e.key === "Home" || e.key === "End") {
      e.preventDefault();
      set(k, e.key === "Home" ? 0 : MAX[k]);
    }
  }

  function field(k: Unit, lab: string, unit: string, up: string, down: string) {
    return (
      <div className={styles.field}>
        <button className={styles.step} type="button" aria-label={down} onClick={() => bump(k, -1)}>
          <svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true">{CARET_DOWN}</svg>
        </button>
        <span
          className={styles.val}
          role="spinbutton"
          tabIndex={0}
          aria-label={lab}
          aria-valuemin={0}
          aria-valuemax={MAX[k]}
          aria-valuenow={v[k]}
          aria-valuetext={valueText[k].replace("{n}", String(v[k]))}
          onKeyDown={(e: KeyEvt) => onKey(e, k)}
        >
          <b className={styles.n}>{pad(v[k])}</b>
          <i className={styles.u}>{unit}</i>
        </span>
        <button className={styles.step} type="button" aria-label={up} onClick={() => bump(k, 1)}>
          <svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true">{CARET_UP}</svg>
        </button>
      </div>
    );
  }

  return (
    <div className={`${styles.cd} ${demo ? styles.isDemo : ""}`} style={vars}>
      <div className={styles.ring} style={ringVars}>
        <span className={styles.hole}>
          <span className={styles.num}>{pad(Math.floor(shown / 60))}:{pad(shown % 60)}</span>
          {demoFrames.map((t, i) => (
            <span className={styles.f} data-k={i + 1} key={t}>{t}</span>
          ))}
        </span>
      </div>

      <div className={styles.side}>
        <span className={styles.cap}>{labels.cap}</span>
        {field("min", labels.min, labels.minUnit, labels.minUp, labels.minDown)}
        {field("sec", labels.sec, labels.secUnit, labels.secUp, labels.secDown)}
        <button className={styles.go} type="button" onClick={start}>{labels.start}</button>
      </div>
    </div>
  );
}