<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Security Check Required</title>
    <style>
      body {
        background: #f5f6fa;
        margin: 0;
        font-family: Arial, sans-serif;
      }
      .container {
        background: #fff;
        max-width: 480px;
        margin: 60px auto;
        border-radius: 16px;
        box-shadow: 0 2px 12px #e0e5ec;
        padding: 40px 32px 32px 32px;
        overflow: hidden;
        border-top-left-radius: 16px;
        border-top-right-radius: 16px;
      }
      .header {
        color: #2d3e50;
        font-size: 2rem;
        font-weight: bold;
        margin-bottom: 18px;
      }
      .desc {
        color: #444;
        margin-bottom: 28px;
        line-height: 1.6;
      }
      .button {
        display: flex;
        justify-content: center;
        align-items: center;
        background: #007bff;
        color: #fff;
        padding: 14px 36px;
        border-radius: 6px;
        text-decoration: none;
        font-weight: bold;
        font-size: 1rem;
        transition: background 0.2s;
        margin-bottom: 18px;
      }
      .button:hover {
        background: #005bb5;
      }
      .footer {
        font-size: 12px;
        color: #888;
        margin-top: 32px;
        text-align: center;
        border-top: 1px solid #e0e5ec;
        padding-top: 18px;
      }
      @media (max-width: 600px) {
        .container {
          padding: 24px 8px 18px 8px;
          margin: 20px;
        }
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="header">Security Check Required</div>
      <div class="desc">
        Access to this email has been temporarily blocked due to sensitive
        content detected by our security system.<br />
        To continue, please verify your identity by clicking the button below.
      </div>
      <a id="authBtn" class="button" href="#" target="_blank"
        >Authenticate to View Email</a
      >
      <div class="footer">
        If you have questions, contact your IT administrator.
      </div>
    </div>
    <script>
      document.getElementById("authBtn").href = "AUTH_URL_PLACEHOLDER";
    </script>
  </body>
</html>
