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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>Wallet Balance – Demo UI</title>
  <style>
    :root{
      --bg:#0f1220;--card:#171a2b;--text:#e7e9f3;--muted:#a7adc2;--accent:#6d8dff;--accent-2:#9b6dff;--danger:#ff6d6d;--ok:#60d394;
      --border:rgba(255,255,255,.08);--shadow:0 10px 30px rgba(0,0,0,.35);
    }
    *{box-sizing:border-box} body{margin:0;background:radial-gradient(1200px 600px at 10% -10%, #1e2240 0%, #0f1220 60%), #0f1220;color:var(--text);font:16px/1.4 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif}
    .container{max-width:900px;margin:40px auto;padding:16px}
    .banner{background:linear-gradient(90deg,rgba(255,255,255,.06),rgba(255,255,255,.02));border:1px solid var(--border);padding:12px 14px;border-radius:14px;margin-bottom:16px}
    .banner strong{color:var(--ok)}
    .row{display:grid;grid-template-columns:1.2fr .8fr auto;gap:10px}
    .card{background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02));border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow);padding:18px}
    .title{font-size:24px;font-weight:700;margin:2px 0 14px}
    label{display:block;font-size:12px;color:var(--muted);margin-bottom:6px}
    input,select,button{width:100%;border-radius:14px;border:1px solid var(--border);padding:12px 14px;background:#0f1220;color:var(--text)}
    input:focus,select:focus,button:focus{outline:2px solid color-mix(in oklab, var(--accent) 60%, white)}
    button{cursor:pointer;background:linear-gradient(135deg, var(--accent), var(--accent-2));border:none;font-weight:700}
    button[disabled]{opacity:.6;cursor:not-allowed}
    .muted{color:var(--muted)}
    .result{display:none;margin-top:14px;border-top:1px dashed var(--border);padding-top:14px}
    .result.visible{display:block}
    .pill{display:inline-flex;gap:8px;align-items:center;border:1px solid var(--border);padding:6px 10px;border-radius:999px;background:rgba(255,255,255,.04);font-size:12px}
    .grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
    .footer{margin-top:30px;color:var(--muted);font-size:12px;text-align:center}
    .error{color:var(--danger);font-size:13px;margin-top:8px}
    .copy{background:transparent;border:1px dashed var(--border);padding:8px 12px}
    @media (max-width:800px){.row{grid-template-columns:1fr}} 
  </style>
</head>
<body>
  <div class="container">
    <div class="banner">
      <strong>Demo only:</strong> This page is a front‑end example. It does <em>not</em> query a real blockchain or wallet provider. Replace the mock code with your own API calls if you are building a legitimate balance checker.
    </div>

    <div class="card">
      <div class="title">Wallet Balance</div>
      <div class="row">
        <div>
          <label for="address">Wallet Address</label>
          <input id="address" placeholder="0x… or other format" autocomplete="off" />
        </div>
        <div>
          <label for="network">Network</label>
          <select id="network">
            <option value="ethereum" selected>Ethereum</option>
            <option value="bsc">BNB Smart Chain</option>
            <option value="solana">Solana</option>
            <option value="polygon">Polygon</option>
            <option value="tron">TRON</option>
          </select>
        </div>
        <div style="align-self:end">
          <button id="checkBtn">Check Balance</button>
        </div>
      </div>
      <div class="error" id="error"></div>

      <div class="result" id="result">
        <div class="grid">
          <div>
            <div class="muted">Normalized Balance</div>
            <div id="balance" style="font-size:28px;font-weight:800;">—</div>
          </div>
          <div>
            <div class="muted">Address</div>
            <div style="display:flex;gap:8px;align-items:center">
              <code id="addrOut" style="font-size:12px;opacity:.9"></code>
              <button class="pill copy" id="copyBtn" title="Copy address">Copy</button>
            </div>
          </div>
        </div>
        <div style="margin-top:10px" class="muted" id="note"></div>
      </div>
    </div>

    <div class="footer">
      <p>For production, use official SDKs/APIs (e.g., Alchemy, Infura, QuickNode, Solana RPC), validate inputs, and never misrepresent balances or brands.</p>
    </div>
  </div>

  <script>
    // --- Simple deterministic mock so results are stable for the same input ---
    function hashToNumber(str){
      let h1 = 0xdeadbeef ^ str.length, h2 = 0x41c6ce57 ^ str.length;
      for (let i=0; i<str.length; i++){
        const ch = str.charCodeAt(i);
        h1 = Math.imul(h1 ^ ch, 2654435761);
        h2 = Math.imul(h2 ^ ch, 1597334677);
      }
      h1 = (h1 ^ (h1>>>16)) >>> 0; h2 = (h2 ^ (h2>>>13)) >>> 0;
      return (h1 + h2) >>> 0; // 0..2^32-1
    }

    function format(num){
      return new Intl.NumberFormat(undefined, {maximumFractionDigits:6}).format(num);
    }

    const address = document.getElementById('address');
    const network = document.getElementById('network');
    const btn = document.getElementById('checkBtn');
    const error = document.getElementById('error');
    const result = document.getElementById('result');
    const balanceEl = document.getElementById('balance');
    const addrOut = document.getElementById('addrOut');
    const note = document.getElementById('note');
    const copyBtn = document.getElementById('copyBtn');

    function validate(addr){
      if (!addr || addr.trim().length < 6) return 'Enter a valid address.';
      // Very light checks – expand per network as needed
      if (network.value === 'ethereum' || network.value === 'bsc' || network.value === 'polygon'){
        if (!/^0x[0-9a-fA-F]{6,}$/.test(addr)) return 'Expected an 0x… style address for this network.';
      }
      return '';
    }

    btn.addEventListener('click', () => {
      error.textContent = '';
      result.classList.remove('visible');

      const addr = address.value.trim();
      const v = validate(addr);
      if (v){ error.textContent = v; return; }

      btn.disabled = true; btn.textContent = 'Checking…';
      // Simulate delay
      setTimeout(() => {
        const seed = hashToNumber(addr + '|' + network.value);
        const base = (seed % 10_000_000) / 100_000; // up to 100
        const decimals = network.value === 'solana' || network.value === 'tron' ? 2 : 4;
        const displayed = Number(base.toFixed(decimals));

        balanceEl.textContent = format(displayed);
        addrOut.textContent = addr;
        note.textContent = `Mock value based on input • Network: ${network.options[network.selectedIndex].text}`;
        result.classList.add('visible');
        btn.disabled = false; btn.textContent = 'Check Balance';
      }, 500);
    });

    copyBtn.addEventListener('click', async () => {
      const text = addrOut.textContent || '';
      if (!text) return;
      try { await navigator.clipboard.writeText(text); copyBtn.textContent = 'Copied'; setTimeout(()=>copyBtn.textContent='Copy', 1200);} catch(e){ console.warn(e); }
    });
  </script>
</body>
</html>