06Country and currency select with flags

<main class="stage">
  <div class="cf is-demo is-open">
    <span class="cf__label" id="cf-label">Ship to</span>
    <button class="cf__btn" type="button" id="cf-btn" aria-haspopup="listbox" aria-expanded="true" aria-controls="cf-list" aria-labelledby="cf-label cf-name">
      <span class="cf__swap">
        <span class="cf__flag cf__slot cf__slot--a"><svg viewBox="0 0 16 12" width="16" height="12" aria-hidden="true"><rect width="16" height="12" fill="#ffffff"/><circle cx="8" cy="6" r="3.4" fill="#a45164"/></svg></span>
        <span class="cf__flag cf__slot cf__slot--b" aria-hidden="true"><svg viewBox="0 0 16 12" width="16" height="12"><rect width="16" height="12" fill="#ffffff"/><rect width="5.33" height="12" fill="#496f93"/><rect x="10.67" width="5.33" height="12" fill="#ca9693"/></svg></span>
      </span>
      <span class="cf__name" id="cf-name">
        <span class="cf__slot cf__slot--a">Japan</span>
        <span class="cf__slot cf__slot--b" aria-hidden="true">France</span>
      </span>
      <span class="cf__cur">
        <span class="cf__slot cf__slot--a">JPY ¥</span>
        <span class="cf__slot cf__slot--b" aria-hidden="true">EUR €</span>
      </span>
      <span class="cf__caret" aria-hidden="true"><svg viewBox="0 0 256 256" width="12" height="12"><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></span>
    </button>
    <span class="cf__mark" aria-hidden="true"></span>
    <ul class="cf__list" id="cf-list" role="listbox" aria-labelledby="cf-label">
      <li class="cf__opt cf__opt--a" id="cf-o1" role="option" aria-selected="true" data-cur="JPY ¥">
        <span class="cf__flag"><svg viewBox="0 0 16 12" width="16" height="12" aria-hidden="true"><rect width="16" height="12" fill="#ffffff"/><circle cx="8" cy="6" r="3.4" fill="#a45164"/></svg></span>
        <span class="cf__opt-name">Japan</span><span class="cf__code">JPY</span>
      </li>
      <li class="cf__opt cf__opt--b" id="cf-o2" role="option" aria-selected="false" data-cur="EUR €">
        <span class="cf__flag"><svg viewBox="0 0 16 12" width="16" height="12" aria-hidden="true"><rect width="16" height="12" fill="#ffffff"/><rect width="5.33" height="12" fill="#496f93"/><rect x="10.67" width="5.33" height="12" fill="#ca9693"/></svg></span>
        <span class="cf__opt-name">France</span><span class="cf__code">EUR</span>
      </li>
      <li class="cf__opt" id="cf-o3" role="option" aria-selected="false" data-cur="PLN zł">
        <span class="cf__flag"><svg viewBox="0 0 16 12" width="16" height="12" aria-hidden="true"><rect width="16" height="6" fill="#ffffff"/><rect y="6" width="16" height="6" fill="#b8707e"/></svg></span>
        <span class="cf__opt-name">Poland</span><span class="cf__code">PLN</span>
      </li>
      <li class="cf__opt" id="cf-o4" role="option" aria-selected="false" data-cur="IDR Rp">
        <span class="cf__flag"><svg viewBox="0 0 16 12" width="16" height="12" aria-hidden="true"><rect width="16" height="6" fill="#b3646d"/><rect y="6" width="16" height="6" fill="#ffffff"/></svg></span>
        <span class="cf__opt-name">Indonesia</span><span class="cf__code">IDR</span>
      </li>
    </ul>
  </div>
</main>

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

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

@include stage($stage-yellow);

.cf {
  position: relative;
  box-sizing: border-box;
  width: min(232px, 84vw);
  // 열린 목록은 absolute 라 높이에 안 잡힌다 — 그만큼 아래를 비워 둔다
  padding-bottom: 116px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: $stage-ink;
}
.cf__label {
  display: block;
  font-size: 10px; line-height: 12px; font-weight: 800;
  letter-spacing: .04em;
  color: rgba(23, 20, 26, .72);
  margin: 0 0 $sp-1;
}
.cf__btn {
  box-sizing: border-box;
  width: 100%; height: 32px;
  display: flex; align-items: center; gap: $sp-2;
  padding: 0 $sp-3;
  border: 1px solid rgba(23, 20, 26, .16);
  background: #fff;
  border-radius: $r-control;
  color: $stage-ink;
  font-family: inherit;
  font-size: 12px; font-weight: 700;
  cursor: pointer;
}
.cf__swap, .cf__name, .cf__cur { display: inline-grid; }
.cf__slot { grid-area: 1 / 1; }
.cf__slot--b { opacity: 0; }
.cf__cur { margin-left: auto; font-size: 11px; font-weight: 700; color: rgba(23, 20, 26, .5); }
.cf__flag {
  display: inline-flex;
  border-radius: $r-xs;
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(23, 20, 26, .14);
}
.cf__caret { display: inline-flex; color: rgba(23, 20, 26, .4); }

.cf__list {
  position: absolute;
  top: 52px; left: 0; right: 0;
  box-sizing: border-box;
  margin: 0; padding: $sp-1;
  list-style: none;
  background: #fff;
  border-radius: $r-card;
  box-shadow: $shadow-raised;
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity $duration $easing, transform $duration $easing;
}
.cf.is-open .cf__list { opacity: 1; transform: translateY(0); pointer-events: auto; }
.cf__mark {
  position: absolute;
  z-index: 1;
  top: 56px; left: $sp-1; right: $sp-1;
  height: 26px;
  border-radius: $r-sm;
  background: rgba(47, 109, 246, .14);
  opacity: 0;
  pointer-events: none;
}
.cf__opt {
  position: relative;
  isolation: isolate;
  box-sizing: border-box;
  height: 26px;
  display: flex; align-items: center; gap: $sp-2;
  padding: 0 $sp-2;
  border-radius: $r-sm;
  font-size: 12px; font-weight: 600;
  cursor: pointer;
}
.cf__opt::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: $r-sm;
  background: rgba(47, 109, 246, .14);
  opacity: 0;
}
.cf__opt[aria-selected="true"]::after { opacity: 1; }
.cf__opt.is-at::after { opacity: .6; }
.cf__code { margin-left: auto; font-size: 10px; font-weight: 700; color: rgba(23, 20, 26, .72); }

// ── 자동 루프: 두 번째 나라로 바뀌었다가 다시 첫 나라로 돌아온다 (국기·이름·통화가 한꺼번에) ──
// 선택 표시는 줄마다 켜고 끄는 게 아니라 막대 하나가 줄 사이(26px)를 미끄러진다.
// 글자와 국기는 겹쳐 놓은 두 겹이라 서서히 교차시키면 두 나라가 동시에 비친다 — steps(1) 로 한 번에 갈아 끼운다
.cf.is-demo .cf__opt::after { opacity: 0; }
.cf.is-demo .cf__mark { opacity: 1; animation: cf-mark $dur-loop $easing infinite; }
.cf.is-demo .cf__slot--a { animation: cf-swap-a $dur-loop steps(1, end) infinite; }
.cf.is-demo .cf__slot--b { animation: cf-swap-b $dur-loop steps(1, end) infinite; }
@keyframes cf-mark {
  0%, 10%   { transform: translateY(0); }
  35%, 65%  { transform: translateY(26px); }
  90%, 100% { transform: translateY(0); }
}
@keyframes cf-swap-a {
  0%, 33%   { opacity: 1; }
  34%, 65%  { opacity: 0; }
  66%, 100% { opacity: 1; }
}
@keyframes cf-swap-b {
  0%, 33%   { opacity: 0; }
  34%, 65%  { opacity: 1; }
  66%, 100% { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .cf.is-demo .cf__slot--a, .cf.is-demo .cf__slot--b,
  .cf.is-demo .cf__mark { animation: none !important; }
  .cf__slot--b { opacity: 0; }
  .cf__list { transition: none; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.cf {
  position: relative;
  box-sizing: border-box;
  width: min(232px, 84vw);
  padding-bottom: 116px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: #17141a;
}

.cf__label {
  display: block;
  font-size: 10px;
  line-height: 12px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: rgba(23, 20, 26, 0.72);
  margin: 0 0 4px;
}

.cf__btn {
  box-sizing: border-box;
  width: 100%;
  height: 32px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  border: 1px solid rgba(23, 20, 26, 0.16);
  background: #fff;
  border-radius: 12px;
  color: #17141a;
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

.cf__swap, .cf__name, .cf__cur {
  display: inline-grid;
}

.cf__slot {
  grid-area: 1/1;
}

.cf__slot--b {
  opacity: 0;
}

.cf__cur {
  margin-left: auto;
  font-size: 11px;
  font-weight: 700;
  color: rgba(23, 20, 26, 0.5);
}

.cf__flag {
  display: inline-flex;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(23, 20, 26, 0.14);
}

.cf__caret {
  display: inline-flex;
  color: rgba(23, 20, 26, 0.4);
}

.cf__list {
  position: absolute;
  top: 52px;
  left: 0;
  right: 0;
  box-sizing: border-box;
  margin: 0;
  padding: 4px;
  list-style: none;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 220ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

.cf__mark {
  position: absolute;
  z-index: 1;
  top: 56px;
  left: 4px;
  right: 4px;
  height: 26px;
  border-radius: 8px;
  background: rgba(47, 109, 246, 0.14);
  opacity: 0;
  pointer-events: none;
}

.cf__opt {
  position: relative;
  isolation: isolate;
  box-sizing: border-box;
  height: 26px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 8px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.cf__opt::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: 8px;
  background: rgba(47, 109, 246, 0.14);
  opacity: 0;
}

.cf__opt[aria-selected=true]::after {
  opacity: 1;
}

.cf__opt.is-at::after {
  opacity: 0.6;
}

.cf__code {
  margin-left: auto;
  font-size: 10px;
  font-weight: 700;
  color: rgba(23, 20, 26, 0.72);
}

.cf.is-demo .cf__opt::after {
  opacity: 0;
}

.cf.is-demo .cf__mark {
  opacity: 1;
  animation: cf-mark 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.cf.is-demo .cf__slot--a {
  animation: cf-swap-a 2s steps(1, end) infinite;
}

.cf.is-demo .cf__slot--b {
  animation: cf-swap-b 2s steps(1, end) infinite;
}

@keyframes cf-mark {
  0%, 10% {
    transform: translateY(0);
  }
  35%, 65% {
    transform: translateY(26px);
  }
  90%, 100% {
    transform: translateY(0);
  }
}
@keyframes cf-swap-a {
  0%, 33% {
    opacity: 1;
  }
  34%, 65% {
    opacity: 0;
  }
  66%, 100% {
    opacity: 1;
  }
}
@keyframes cf-swap-b {
  0%, 33% {
    opacity: 0;
  }
  34%, 65% {
    opacity: 1;
  }
  66%, 100% {
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cf.is-demo .cf__slot--a, .cf.is-demo .cf__slot--b,
  .cf.is-demo .cf__mark {
    animation: none !important;
  }
  .cf__slot--b {
    opacity: 0;
  }
  .cf__list {
    transition: none;
  }
}

// 실제 동작: 국가를 고르면 버튼의 국기와 통화 표시가 함께 바뀐다.
var root = document.querySelector('.cf');
var btn = document.getElementById('cf-btn');
var list = document.getElementById('cf-list');
var name = document.getElementById('cf-name');
var swap = root.querySelector('.cf__swap');
var cur = root.querySelector('.cf__cur');
var opts = [].slice.call(list.querySelectorAll('.cf__opt'));
var at = 0;
function open(on) {
  root.classList.remove('is-demo');
  root.classList.toggle('is-open', on);
  btn.setAttribute('aria-expanded', String(on));
  if (on) list.focus({ preventScroll: true });
}
function pick(i) {
  at = i;
  root.classList.remove('is-demo');
  opts.forEach(function (o, k) { o.setAttribute('aria-selected', String(k === i)); });
  swap.innerHTML = opts[i].querySelector('.cf__flag').innerHTML;
  name.textContent = opts[i].querySelector('.cf__opt-name').textContent;
  cur.textContent = opts[i].dataset.cur;
  open(false);
  btn.focus({ preventScroll: true });
}
btn.addEventListener('click', function () { open(!root.classList.contains('is-open')); });
opts.forEach(function (o, i) { o.addEventListener('click', function () { pick(i); }); });
list.setAttribute('tabindex', '-1');
list.addEventListener('keydown', function (e) {
  if (e.key === 'ArrowDown' || e.key === 'ArrowUp') {
    at = Math.max(0, Math.min(at + (e.key === 'ArrowDown' ? 1 : -1), opts.length - 1));
    opts.forEach(function (o, k) { o.classList.toggle('is-at', k === at); });
    list.setAttribute('aria-activedescendant', opts[at].id);
    e.preventDefault();
  } else if (e.key === 'Enter' || e.key === ' ') { pick(at); e.preventDefault(); }
  else if (e.key === 'Escape') { open(false); btn.focus({ preventScroll: true }); }
});
document.addEventListener('click', function (e) { if (!e.target.closest('.cf')) open(false); });

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

export type Country = {
  name: string;
  code: string;
  currency: string;
  flag: ReactNode;
};

export type CountrySelectProps = {
  label?: string;
  countries?: Country[];
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type KeyEvt = { key: string; preventDefault: () => void };
type ChangeEvt = { target: { value: string } };
type ClickEvt = { stopPropagation: () => void };

const FLAG_JAPAN: ReactNode = (
  <svg viewBox="0 0 16 12" width="16" height="12" aria-hidden="true">
    <rect width="16" height="12" fill="#ffffff" />
    <circle cx="8" cy="6" r="3.4" fill="#bc002d" />
  </svg>
);

const FLAG_FRANCE: ReactNode = (
  <svg viewBox="0 0 16 12" width="16" height="12" aria-hidden="true">
    <rect width="16" height="12" fill="#ffffff" />
    <rect width="5.33" height="12" fill="#0055a4" />
    <rect x="10.67" width="5.33" height="12" fill="#ef4135" />
  </svg>
);

const FLAG_POLAND: ReactNode = (
  <svg viewBox="0 0 16 12" width="16" height="12" aria-hidden="true">
    <rect width="16" height="6" fill="#ffffff" />
    <rect y="6" width="16" height="6" fill="#dc143c" />
  </svg>
);

const FLAG_INDONESIA: ReactNode = (
  <svg viewBox="0 0 16 12" width="16" height="12" aria-hidden="true">
    <rect width="16" height="6" fill="#ce1126" />
    <rect y="6" width="16" height="6" fill="#ffffff" />
  </svg>
);

const DEFAULT_COUNTRIES: Country[] = [
  { name: "Japan", code: "JPY", currency: "JPY ¥", flag: FLAG_JAPAN },
  { name: "France", code: "EUR", currency: "EUR €", flag: FLAG_FRANCE },
  { name: "Poland", code: "PLN", currency: "PLN zł", flag: FLAG_POLAND },
  { name: "Indonesia", code: "IDR", currency: "IDR Rp", flag: FLAG_INDONESIA },
];

export default function CountrySelect({
  label = "Ship to",
  countries = DEFAULT_COUNTRIES,
  duration = 180,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#2f6df6",
}: CountrySelectProps) {
  const [open, setOpen] = useState(false);
  const [picked, setPicked] = useState(0);
  const [active, setActive] = useState(0);
  const rootRef = useRef<HTMLDivElement>(null);
  const btnRef = useRef<HTMLButtonElement>(null);
  const listRef = useRef<HTMLUListElement>(null);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const current = countries[picked];

  useEffect(() => {
    function onDocClick(e: MouseEvent) {
      if (rootRef.current && !rootRef.current.contains(e.target as Node)) setOpen(false);
    }
    document.addEventListener("click", onDocClick);
    return () => document.removeEventListener("click", onDocClick);
  }, []);

  useEffect(() => {
    if (open) listRef.current?.focus({ preventScroll: true });
  }, [open]);

  function pick(i: number) {
    setPicked(i);
    setActive(i);
    setOpen(false);
    btnRef.current?.focus({ preventScroll: true });
  }

  return (
    <div className={`${styles.cf} ${open ? styles.isOpen : ""}`} style={vars} ref={rootRef}>
      <span className={styles.label} id="cf-label">{label}</span>
      <button
        ref={btnRef}
        type="button"
        id="cf-btn"
        className={styles.btn}
        aria-haspopup="listbox"
        aria-expanded={open}
        aria-controls="cf-list"
        aria-labelledby="cf-label cf-name"
        onClick={() => setOpen((o) => !o)}
      >
        <span className={styles.flag}>{current.flag}</span>
        <span className={styles.name} id="cf-name">{current.name}</span>
        <span className={styles.cur}>{current.currency}</span>
        <span className={styles.caret} aria-hidden="true">
          <svg viewBox="0 0 256 256" width="12" height="12">
            <g fill="currentColor">
              <path d="m208 96l-80 80l-80-80Z" opacity=".2" />
              <path d="M215.39 92.94A8 8 0 0 0 208 88H48a8 8 0 0 0-5.66 13.66l80 80a8 8 0 0 0 11.32 0l80-80a8 8 0 0 0 1.73-8.72M128 164.69L67.31 104h121.38Z" />
            </g>
          </svg>
        </span>
      </button>
      <ul
        ref={listRef}
        id="cf-list"
        className={styles.list}
        role="listbox"
        aria-labelledby="cf-label"
        aria-activedescendant={`cf-o${active}`}
        tabIndex={-1}
        onKeyDown={(e: KeyEvt) => {
          if (e.key === "ArrowDown") { setActive((a) => Math.min(a + 1, countries.length - 1)); e.preventDefault(); }
          else if (e.key === "ArrowUp") { setActive((a) => Math.max(a - 1, 0)); e.preventDefault(); }
          else if (e.key === "Enter" || e.key === " ") { pick(active); e.preventDefault(); }
          else if (e.key === "Escape") { setOpen(false); btnRef.current?.focus({ preventScroll: true }); }
        }}
      >
        {countries.map((c, i) => (
          <li
            key={c.code}
            id={`cf-o${i}`}
            className={`${styles.opt} ${i === active ? styles.isAt : ""} ${i === picked ? styles.isPicked : ""}`}
            role="option"
            aria-selected={i === picked}
            onMouseMove={() => setActive(i)}
            onClick={() => pick(i)}
          >
            <span className={styles.flag}>{c.flag}</span>
            <span className={styles.optName}>{c.name}</span>
            <span className={styles.code}>{c.code}</span>
          </li>
        ))}
      </ul>
    </div>
  );
}