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    my $source = $raw_source;
    $source =~ s/&/&amp;/g;
    $source =~ s/</&lt;/g;
    $source =~ s/>/&gt;/g;

    my $page_id = $page->as_hash->{id} || '';
    my $is_saved = ( $page->{meta}{source_kind} || '' ) ne 'transient' && $page_id ne '';
    my $page_url = $is_saved ? $self->_saved_page_url($page_id) : '';
    my $urls = {
        edit   => $is_saved ? $page_url . '/edit' : $self->{pages}->editable_url($page),
        render => $is_saved ? $page_url : $self->{pages}->render_url($page),
        source => $is_saved ? $page_url . '/edit' : $self->{pages}->editable_url($page),
    };
    my $form_action = $is_saved ? $page_url . '/edit' : '/';

    my $title = $page->as_hash->{title};
    $title =~ s/&/&amp;/g;
    $title =~ s/</&lt;/g;
    $title =~ s/>/&gt;/g;

    my $html = <<'HTML';
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>__TITLE__</title>
  <style>
    body { margin: 0; font-family: Georgia, serif; background: #f5efe2; color: #1f2a2e; }
    main { max-width: 980px; margin: 32px auto; background: #fffef9; border: 1px solid #ddd3c2; padding: 24px; }
    .editor-stack {
      position: relative;
      min-height: 520px;
      border: 1px solid #2a2f36;
      background: #1f2328;
      overflow: hidden;
    }
    .editor-overlay,
    .instruction-editor {
      display: block;
      width: 100%;
      min-height: 520px;
      box-sizing: border-box;
      margin: 0;
      padding: 12px;
      font-family: Menlo, Consolas, "Courier New", monospace;
      font-size: 14px;
      line-height: 21px;
      white-space: pre;
      word-break: normal;
      overflow-wrap: normal;
      overflow: auto;
      tab-size: 4;
      letter-spacing: 0;
    }
    .editor-overlay-viewport {
      position: absolute;
      inset: 0;
      overflow: hidden;
      pointer-events: none;
      background: transparent;
    }
    .editor-overlay {
      position: absolute;
      top: 0;
      left: 0;
      min-width: 100%;
      color: #e6edf3;
      background: transparent;
      unicode-bidi: plaintext;
      direction: ltr;
      will-change: transform;
    }
    .instruction-editor {
      position: relative;
      z-index: 1;
      height: 520px;
      color: transparent;
      border: 0;
      resize: vertical;
      background: transparent;
      caret-color: #f8f8f2;
      outline: none;
      -webkit-text-fill-color: transparent;
      unicode-bidi: plaintext;
      direction: ltr;
      overflow: auto;
      scrollbar-gutter: stable both-edges;
    }
    .instruction-editor::selection {
      background: rgba(121, 192, 255, 0.35);
      -webkit-text-fill-color: transparent;
    }
    .tok-directive { color: #ffd866; font-weight: normal; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; }
    .tok-separator { color: #5c6370; }
    .tok-html { color: #78dce8; }
    .tok-tag { color: #ff7ab2; }
    .tok-attr { color: #ffcf6a; }
    .tok-value { color: #a9dc76; }
    .tok-css { color: #78dce8; }
    .tok-js { color: #ab9df2; }
    .tok-code { color: #a9dc76; }
    .tok-perl-keyword { color: #ff7ab2; }
    .tok-perl-var { color: #78dce8; }
    .tok-string { color: #ffd866; }
    .tok-comment { color: #727b84; }
    .tok-note { color: #ff6188; }
    a { color: #0b7a75; margin-right: 18px; text-decoration: none; }
  </style>
</head>
<body>
<main>
  __TOP_CHROME__
  <form method="post" action="__FORM_ACTION__" id="instruction-form">
    <div class="editor-stack">
      <div class="editor-overlay-viewport" aria-hidden="true"><pre class="editor-overlay" id="instruction-highlight">__INITIAL_HIGHLIGHT__</pre></div>
      <textarea class="instruction-editor" id="instruction-editor" name="instruction" wrap="off" spellcheck="false" autocapitalize="off" autocomplete="off" autocorrect="off">__SOURCE__</textarea>
    </div>
  </form>
</main>
<script>
const ddForm = document.getElementById('instruction-form');
const ddEditor = document.getElementById('instruction-editor');
const ddHighlight = document.getElementById('instruction-highlight');
function ddEscapeHtml(text) {
  return String(text)
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;');
}
function ddStoreToken(tokens, html) {
  tokens.push(html);
  return '\u001eHL' + (tokens.length - 1) + '\u001e';
}
function ddRestoreTokens(text, tokens) {
  if (!Array.isArray(tokens) || !tokens.length) return text;
  return String(text).replace(/\u001eHL(\d+)\u001e/g, function(_, index) {
    return Object.prototype.hasOwnProperty.call(tokens, index) ? tokens[index] : '';
  });
}
function ddHighlightInstruction(text) {
  const state = { section: '', htmlMode: '' };
  return String(text).split('\n').map((line) => ddHighlightLine(line, state)).join('\n');
}
function ddHighlightLine(line, state) {
  if (line === ':--------------------------------------------------------------------------------:') {
    return '<span class="tok-separator">' + ddEscapeHtml(line) + '</span>';
  }
  const match = line.match(/^([A-Za-z][A-Za-z0-9.]*:)(\s*)(.*)$/);
  if (match) {
    state.section = match[1].slice(0, -1).toUpperCase();
    state.htmlMode = '';
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