<div style="
  position: fixed;
  top: 15px;
  right: 35px;
  z-index: 2147483647;
  font-family: sans-serif;
  font-size: 12px;
  pointer-events: auto;
">
  
  <div id="lang-btn" style="
    background: transparent;
    border: none;
    cursor: pointer;
    color: #333;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    user-select: none;
  " role="button" tabindex="0" aria-haspopup="true" aria-expanded="false">
    <span id="selected-lang">EN</span>
    <span id="arrow">▼</span>
  </div>

  
  <div id="dropdown" style="
    display: none;
    position: absolute;
    right: 0;
    margin-top: 4px;
    background: rgba(255,255,255,0.95);
    border: 1px solid #ccc;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
    font-size: 10px;
    overflow: hidden;
    min-width: 80px;
  ">
    <a href="/ko" style="
      display:block; padding:6px 12px; color:#333; text-decoration:none;
    ">KO</a>
    <a href="/" style="
      display:block; padding:6px 12px; color:#333; text-decoration:none;
    ">EN</a>
  </div>
</div>

<script>
  (function() {
    function ready(fn){ 
      if(document.readyState!=='loading'){ fn(); } 
      else { document.addEventListener('DOMContentLoaded', fn); }
    }

    ready(function () {
      var btn = document.getElementById('lang-btn');
      var dropdown = document.getElementById('dropdown');
      var arrow = document.getElementById('arrow');
      var selected = document.getElementById('selected-lang');

      // 현재 경로로 언어 자동 표시
      var path = (window.location.pathname || '').toLowerCase();
      selected.textContent = (path.indexOf('/ko') === 0) ? 'KO' : 'EN';

      // 열고 닫기
      function toggle(open){
        dropdown.style.display = open ? 'block' : 'none';
        arrow.textContent = open ? '▲' : '▼';
        btn.setAttribute('aria-expanded', open ? 'true' : 'false');
      }

      btn.addEventListener('click', function(e){
        e.stopPropagation();
        toggle(dropdown.style.display !== 'block');
      });

      // 키보드 접근성
      btn.addEventListener('keydown', function(e){
        if (e.key === 'Enter' || e.key === ' ') {
          e.preventDefault();
          toggle(dropdown.style.display !== 'block');
        }
      });

      // 바깥 클릭 시 닫기
      document.addEventListener('click', function(e){
        if (!btn.contains(e.target) && !dropdown.contains(e.target)) toggle(false);
      });

      // 스크롤/리사이즈 중 우발적 오버레이 이슈 방지
      window.addEventListener('scroll', function(){ toggle(false); });
      window.addEventListener('resize', function(){ toggle(false); });
    });
  })();
</script>

2D ANIMATION COURSE