(async()=>{
  const storageKey = 'wv-verified';
  const verifiedTime = localStorage.getItem(storageKey);
  if(verifiedTime && Date.now() - verifiedTime < 2592000000) {
    return;
  }

  const s=document.createElement('style');s.textContent=`
    :root{--overlay-bg:#000;--card-bg:rgba(0,0,0,0.85);--accent:#fff;--text-main:#fff;--text-secondary:rgba(255,255,255,0.7);--radius:12px;--transition:.3s ease;--dot-size:8px;--dot-gap:8px}
    #wv-check-overlay{position:fixed;inset:0;background:var(--overlay-bg);display:flex;align-items:center;justify-content:center;font-family:system-ui,sans-serif;z-index:2147483647;opacity:1;transition:opacity .4s ease-out}
    #wv-check-overlay.fade-out{opacity:0}
    #wv-check-card{background:var(--card-bg);backdrop-filter:blur(12px);border-radius:var(--radius);padding:32px 24px;width:340px;text-align:center;color:var(--text-main);transition:transform var(--transition)}
    #wv-check-card h2{margin:0 0 16px;font-size:1.6rem;display:flex;align-items:center;justify-content:center;gap:.5rem}
    #wv-progress-bar{width:0;height:6px;background:var(--accent);transition:width var(--transition);border-radius:var(--radius)}
    #wv-info{margin:12px 0 20px;font-size:.95rem;color:var(--text-secondary)}
    #wv-loading-dots{display:flex;justify-content:center;align-items:center;gap:var(--dot-gap);margin-top:5px}
    #wv-loading-dots .dot{width:var(--dot-size);height:var(--dot-size);background:var(--accent);border-radius:50%;opacity:.3;animation:windows-load 1s infinite ease-in-out}
    #wv-loading-dots .dot:nth-child(1){animation-delay:0s}#wv-loading-dots .dot:nth-child(2){animation-delay:.2s}#wv-loading-dots .dot:nth-child(3){animation-delay:.4s}#wv-loading-dots .dot:nth-child(4){animation-delay:.6s}
    @keyframes windows-load{0%,80%,100%{opacity:.3;transform:scale(1)}40%{opacity:1;transform:scale(1.4)}}
    #wv-complete{display:none;text-align:center}#wv-complete.show{display:block;animation:fade-in .4s ease-out forwards}
    #wv-complete h2{display:flex;align-items:center;justify-content:center;gap:.5rem;font-size:1.5rem;margin-bottom:8px;color:var(--accent)}
    #wv-complete p{color:var(--accent);font-size:1rem;text-align:center;margin:0 auto;width:100%}@keyframes fade-in{from{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}
  `;document.head.appendChild(s);

  const overlay=document.createElement('div');overlay.id='wv-check-overlay';overlay.innerHTML=`
    <div id="wv-check-card">
      <h2><i class="fas fa-shield-alt"></i>Verifying Your Browser...</h2>
      <div id="wv-progress"><div id="wv-progress-bar"></div></div>
      <div id="wv-info">Starting tests...</div>
      <div id="wv-loading-dots"><div class="dot"></div><div class="dot"></div><div class="dot"></div><div class="dot"></div></div>
    </div>
    <div id="wv-complete">
      <h2><i class="fas fa-check-circle"></i>Success!</h2>
      <p>You may continue.</p>
    </div>`;
  document.body.appendChild(overlay);

  const info=overlay.querySelector('#wv-info'), bar=overlay.querySelector('#wv-progress-bar');
  const tests=[
    async()=>({msg:'Browser Automation',pass:!navigator.webdriver}),
    async()=>{
      const ua = navigator.userAgent.toLowerCase();
      return {msg:'Headless Mode',pass:!/headless|phantomjs|puppeteer|selenium/i.test(ua)};
    },
    async()=>({msg:'Language Support',pass:navigator.languages && navigator.languages.length > 0}),
    async()=>({msg:'Browser Plugins',pass:navigator.plugins.length > 0}),
    async()=>{
      try {
        const c=document.createElement('canvas');
        const gl=c.getContext('webgl')||c.getContext('experimental-webgl');
        if(!gl) return {msg:'WebGL Support',pass:false};
        const debugInfo=gl.getExtension('WEBGL_debug_renderer_info');
        const vendor=debugInfo ? gl.getParameter(debugInfo.UNMASKED_VENDOR_WEBGL) : '';
        return {msg:'Graphics Driver',pass:!/swiftshader|lavapipe/i.test(vendor)};
      } catch(e) {
        return {msg:'WebGL Support',pass:false};
      }
    },
    async()=>({msg:'Screen Resolution',pass:screen.width >= 320 && screen.height >= 480}),
    async()=>{
      try {
        const start = performance.now();
        const buffer = new ArrayBuffer(1000000);
        const view = new Uint8Array(buffer);
        return {msg:'Performance Check',pass:performance.now() - start < 30};
      } catch(e) {
        return {msg:'Performance Check',pass:false};
      }
    },
    async()=>({msg:'Device Memory',pass:!navigator.deviceMemory || navigator.deviceMemory > 0.5}),
    async()=>{
      const mq=window.matchMedia('(pointer:fine)');
      return {msg:'Input Method',pass:mq.matches};
    }
  ];

  const failures=[];
  for(let i=0;i<tests.length;i++){
    try {
      const res=await tests[i]();
      info.textContent=`Test ${i+1}/${tests.length}: ${res.msg}`;
      if(!res.pass) failures.push(res.msg);
      bar.style.width=`${((i+1)/tests.length)*100}%`;
      await new Promise(r=>setTimeout(r,300));
    } catch(e) {
      failures.push(`Test error`);
    }
  }

  if(failures.length===0){
    localStorage.setItem(storageKey, Date.now());
    overlay.querySelector('#wv-check-card').style.display='none';
    overlay.querySelector('#wv-complete').classList.add('show');
    setTimeout(()=>{
      overlay.classList.add('fade-out');
      setTimeout(()=>overlay.remove(),400);
    },800);
  } else {
    info.innerHTML=`Verification failed:<br>${failures.map(m=>`• ${m}`).join('<br>')}`;
    bar.style.background='red';
    overlay.querySelector('#wv-loading-dots').remove();
  }
})();