Add WenPai Trademark Symbol plugin core files

Introduce the initial implementation of the WenPai Trademark Symbol WordPress plugin, including the main plugin logic (wenpai-trademark.php), admin interface template (admin-template.php), and admin styles (admin-styles.css). Features include term management, scope and exclusion settings, import/export functionality, and AJAX-based admin operations.

admin-styles.css

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+/* WenPai Trademark Plugin Admin Styles */
+
+.wenpai-admin {
+    max-width: 1200px;
+}
+
+.wenpai-card {
+    background: #fff;
+    border: 1px solid #ccd0d4;
+    border-radius: 4px;
+    margin: 20px 0;
+    padding: 20px;
+    box-shadow: 0 1px 1px rgba(0,0,0,.04);
+}
+
+.wenpai-card h2 {
+    margin-top: 0;
+    border-bottom: 1px solid #eee;
+    padding-bottom: 10px;
+    color: #23282d;
+}
+
+.wenpai-card h3 {
+    margin-top: 25px;
+    margin-bottom: 15px;
+    color: #23282d;
+}
+
+#wenpai-admin-notices {
+    margin: 15px 0;
+}
+
+.wenpai-notice {
+    background: #fff;
+    border-left: 4px solid #00a0d2;
+    box-shadow: 0 1px 1px 0 rgba(0,0,0,.1);
+    margin: 5px 0 15px;
+    padding: 12px;
+    border-radius: 0 4px 4px 0;
+}
+
+.wenpai-notice.notice-success {
+    border-left-color: #46b450;
+    background-color: #f7fff7;
+}
+
+.wenpai-notice.notice-error {
+    border-left-color: #dc3232;
+    background-color: #fff7f7;
+}
+
+.wenpai-notice.notice-warning {
+    border-left-color: #ffb900;
+    background-color: #fffbf0;
+}
+
+.wenpai-loading {
+    opacity: 0.6;
+    pointer-events: none;
+    position: relative;
+}
+
+.wenpai-loading::after {
+    content: '';
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: rgba(255,255,255,0.7);
+    z-index: 1000;
+}
+
+.wenpai-terms-table {
+    width: 100%;
+    border-collapse: collapse;
+    margin-top: 15px;
+}
+
+.wenpai-terms-table th,
+.wenpai-terms-table td {
+    padding: 12px;
+    text-align: left;
+    border-bottom: 1px solid #ddd;
+}
+
+.wenpai-terms-table th {
+    background-color: #f9f9f9;
+    font-weight: 600;
+    color: #23282d;
+}
+
+.wenpai-terms-table tr:hover {
+    background-color: #f9f9f9;
+}
+
+.wenpai-terms-table .actions {
+    white-space: nowrap;
+}
+
+.wenpai-terms-table .actions .button {
+    margin-right: 5px;
+    font-size: 12px;
+    padding: 4px 8px;
+    height: auto;
+    line-height: 1.4;
+}
+
+.wenpai-form-row {
+    display: flex;
+    align-items: center;
+    margin-bottom: 15px;
+    gap: 15px;
+}
+
+.wenpai-form-row label {
+    min-width: 120px;
+    font-weight: 600;
+    color: #23282d;
+}
+
+.wenpai-form-row input,
+.wenpai-form-row select {
+    flex: 1;
+    max-width: 300px;
+}
+
+.wenpai-form-row input[type="checkbox"] {
+    flex: none;
+    margin-right: 8px;
+}
+
+.wenpai-checkbox-group {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+
+.wenpai-checkbox-group label {
+    display: flex;
+    align-items: center;
+    min-width: auto;
+    font-weight: normal;
+}
+
+.wenpai-file-upload {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    margin-bottom: 10px;
+}
+
+.wenpai-description {
+    font-style: italic;
+    color: #666;
+    font-size: 13px;
+    margin-top: 5px;
+}
+
+.wenpai-button-group {
+    display: flex;
+    gap: 10px;
+    margin-top: 20px;
+}
+
+.wenpai-button-primary {
+    background: #0073aa;
+    border-color: #0073aa;
+    color: #fff;
+}
+
+.wenpai-button-primary:hover {
+    background: #005a87;
+    border-color: #005a87;
+}
+
+.wenpai-button-secondary {
+    background: #f7f7f7;
+    border-color: #ccc;
+    color: #555;
+}
+
+.wenpai-button-secondary:hover {
+    background: #fafafa;
+    border-color: #999;
+}
+
+.wenpai-button-danger {
+    background: #dc3232;
+    border-color: #dc3232;
+    color: #fff;
+}
+
+.wenpai-button-danger:hover {
+    background: #c62d2d;
+    border-color: #c62d2d;
+}
+
+.wenpai-stats {
+    display: flex;
+    gap: 20px;
+    margin-bottom: 20px;
+}
+
+.wenpai-stat-box {
+    background: #f9f9f9;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    padding: 15px;
+    text-align: center;
+    flex: 1;
+}
+
+.wenpai-stat-number {
+    font-size: 24px;
+    font-weight: bold;
+    color: #0073aa;
+    display: block;
+}
+
+.wenpai-stat-label {
+    font-size: 13px;
+    color: #666;
+    margin-top: 5px;
+}
+
+.wenpai-help-text {
+    background: #f0f8ff;
+    border: 1px solid #b3d9ff;
+    border-radius: 4px;
+    padding: 15px;
+    margin: 15px 0;
+}
+
+.wenpai-help-text h4 {
+    margin-top: 0;
+    color: #0073aa;
+}
+
+.wenpai-help-text ul {
+    margin-bottom: 0;
+}
+
+.wenpai-help-text li {
+    margin-bottom: 5px;
+}
+
+@media (max-width: 768px) {
+    .wenpai-form-row {
+        flex-direction: column;
+        align-items: flex-start;
+        gap: 8px;
+    }
+    
+    .wenpai-form-row label {
+        min-width: auto;
+    }
+    
+    .wenpai-form-row input,
+    .wenpai-form-row select {
+        max-width: 100%;
+        width: 100%;
+    }
+    
+    .wenpai-stats {
+        flex-direction: column;
+        gap: 10px;
+    }
+    
+    .wenpai-button-group {
+        flex-direction: column;
+    }
+    
+    .wenpai-file-upload {
+        flex-direction: column;
+        align-items: flex-start;
+    }
+}
+
+/* Animation for notices */
+@keyframes wenpai-fade-in {
+    from {
+        opacity: 0;
+        transform: translateY(-10px);
+    }
+    to {
+        opacity: 1;
+        transform: translateY(0);
+    }
+}
+
+.wenpai-notice {
+    animation: wenpai-fade-in 0.3s ease-out;
+}
+
+/* Loading spinner */
+.wenpai-spinner {
+    display: inline-block;
+    width: 16px;
+    height: 16px;
+    border: 2px solid #f3f3f3;
+    border-top: 2px solid #0073aa;
+    border-radius: 50%;
+    animation: wenpai-spin 1s linear infinite;
+    margin-right: 8px;
+}
+
+@keyframes wenpai-spin {
+    0% { transform: rotate(0deg); }
+    100% { transform: rotate(360deg); }
+}
+
+/* Responsive table */
+@media (max-width: 768px) {
+    .wenpai-terms-table {
+        font-size: 14px;
+    }
+    
+    .wenpai-terms-table th,
+    .wenpai-terms-table td {
+        padding: 8px 4px;
+    }
+    
+    .wenpai-terms-table .actions .button {
+        font-size: 11px;
+        padding: 3px 6px;
+        margin-right: 2px;
+    }
+}

admin-template.php

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+<?php
+// Prevent direct access
+if (!defined('ABSPATH')) {
+    exit;
+}
+
+$plugin = WenpaiTrademarkPlugin::get_instance();
+$terms = $plugin->get_terms();
+$scopes = $plugin->get_scopes();
+$exclude_post_ids = \get_option(WenpaiTrademarkPlugin::OPTION_EXCLUDED_POST_IDS, '');
+$exclude_html_tags = \get_option(WenpaiTrademarkPlugin::OPTION_EXCLUDED_TAGS, 'a,code,pre');
+?>
+
+<div class="wrap">
+    <h1>WenPai Trademark Symbol Settings</h1>
+    
+    <div id="wenpai-admin-notices"></div>
+    
+    <form id="wenpai-settings-form" method="post" action="options.php">
+        <?php \settings_fields('wenpai_trademark_settings'); ?>
+        
+        <!-- Terms Management -->
+        <div class="card">
+            <h2>Trademark Terms</h2>
+            <table class="wp-list-table widefat fixed striped" id="terms-table">
+                <thead>
+                    <tr>
+                        <th>Term</th>
+                        <th>Symbol</th>
+                        <th>Position</th>
+                        <th>Density</th>
+                        <th>Case Sensitive</th>
+                        <th>Whole Word</th>
+                        <th>Actions</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    <?php foreach ($terms as $term => $config): ?>
+                    <tr>
+                        <td><?php echo \esc_html($term); ?></td>
+                        <td><?php echo \esc_html($config['symbol']); ?></td>
+                        <td><?php echo \esc_html($config['position']); ?></td>
+                        <td><?php echo \esc_html($config['density']); ?></td>
+                        <td><?php echo $config['case_sensitive'] ? 'Yes' : 'No'; ?></td>
+                        <td><?php echo $config['whole_word'] ? 'Yes' : 'No'; ?></td>
+                        <td>
+                            <button type="button" class="button edit-term" data-term="<?php echo \esc_attr($term); ?>">Edit</button>
+                            <button type="button" class="button delete-term" data-term="<?php echo \esc_attr($term); ?>">Delete</button>
+                        </td>
+                    </tr>
+                    <?php endforeach; ?>
+                </tbody>
+            </table>
+            
+            <h3>Add New Term</h3>
+            <table class="form-table">
+                <tr>
+                    <th><label for="new-term">Term</label></th>
+                    <td><input type="text" id="new-term" class="regular-text" /></td>
+                </tr>
+                <tr>
+                    <th><label for="new-symbol">Symbol</label></th>
+                    <td>
+                        <select id="new-symbol">
+                            <option value="™">™ (Trademark)</option>
+                            <option value="®">® (Registered)</option>
+                            <option value="©">© (Copyright)</option>
+                            <option value="℠">℠ (Service Mark)</option>
+                            <option value="℗">℗ (Sound Recording)</option>
+                        </select>
+                    </td>
+                </tr>
+                <tr>
+                    <th><label for="new-position">Position</label></th>
+                    <td>
+                        <select id="new-position">
+                            <option value="after">After term</option>
+                            <option value="before">Before term</option>
+                        </select>
+                    </td>
+                </tr>
+                <tr>
+                    <th><label for="new-density">Density</label></th>
+                    <td><input type="number" id="new-density" min="1" max="10" value="1" /></td>
+                </tr>
+                <tr>
+                    <th><label for="new-case-sensitive">Case Sensitive</label></th>
+                    <td><input type="checkbox" id="new-case-sensitive" /></td>
+                </tr>
+                <tr>
+                    <th><label for="new-whole-word">Whole Word Only</label></th>
+                    <td><input type="checkbox" id="new-whole-word" checked /></td>
+                </tr>
+            </table>
+            <button type="button" id="add-term" class="button button-primary">Add Term</button>
+        </div>
+        
+        <!-- Scope Settings -->
+        <div class="card">
+            <h2>Application Scope</h2>
+            <table class="form-table">
+                <tr>
+                    <th>Apply To</th>
+                    <td>
+                        <label><input type="checkbox" name="scopes[content]" value="1" <?php \checked(!empty($scopes['content'])); ?> /> Post Content</label><br>
+                        <label><input type="checkbox" name="scopes[title]" value="1" <?php \checked(!empty($scopes['title'])); ?> /> Post Titles</label><br>
+                        <label><input type="checkbox" name="scopes[widgets]" value="1" <?php \checked(!empty($scopes['widgets'])); ?> /> Widgets</label><br>
+                        <label><input type="checkbox" name="scopes[comments]" value="1" <?php \checked(!empty($scopes['comments'])); ?> /> Comments</label>
+                    </td>
+                </tr>
+            </table>
+        </div>
+        
+        <!-- Exclusion Settings -->
+        <div class="card">
+            <h2>Exclusion Settings</h2>
+            <table class="form-table">
+                <tr>
+                    <th><label for="exclude-post-ids">Exclude Post IDs</label></th>
+                    <td>
+                        <input type="text" id="exclude-post-ids" name="exclude_post_ids" value="<?php echo \esc_attr($exclude_post_ids); ?>" class="regular-text" />
+                        <p class="description">Comma-separated list of post IDs to exclude from replacement.</p>
+                    </td>
+                </tr>
+                <tr>
+                    <th><label for="exclude-html-tags">Exclude HTML Tags</label></th>
+                    <td>
+                        <input type="text" id="exclude-html-tags" name="exclude_html_tags" value="<?php echo \esc_attr($exclude_html_tags); ?>" class="regular-text" />
+                        <p class="description">Comma-separated list of HTML tags to exclude from replacement (e.g., a,code,pre).</p>
+                    </td>
+                </tr>
+            </table>
+        </div>
+        
+        <!-- Import/Export -->
+        <div class="card">
+            <h2>Import/Export</h2>
+            <table class="form-table">
+                <tr>
+                    <th><label for="csv-file">Import CSV</label></th>
+                    <td>
+                        <input type="file" id="csv-file" accept=".csv" />
+                        <button type="button" id="import-terms" class="button">Import Terms</button>
+                        <p class="description">CSV format: Term,Symbol,Position,Density,Case Sensitive,Whole Word</p>
+                    </td>
+                </tr>
+                <tr>
+                    <th>Export</th>
+                    <td>
+                        <button type="button" id="export-terms" class="button">Export Terms as CSV</button>
+                    </td>
+                </tr>
+            </table>
+        </div>
+        
+        <?php \submit_button('Save Settings'); ?>
+    </form>
+</div>
+
+<style>
+.card {
+    background: #fff;
+    border: 1px solid #ccd0d4;
+    border-radius: 4px;
+    margin: 20px 0;
+    padding: 20px;
+    box-shadow: 0 1px 1px rgba(0,0,0,.04);
+}
+.card h2 {
+    margin-top: 0;
+    border-bottom: 1px solid #eee;
+    padding-bottom: 10px;
+}
+#wenpai-admin-notices {
+    margin: 15px 0;
+}
+.notice {
+    background: #fff;
+    border-left: 4px solid #00a0d2;
+    box-shadow: 0 1px 1px 0 rgba(0,0,0,.1);
+    margin: 5px 0 15px;
+    padding: 1px 12px;
+}
+.notice.notice-success {
+    border-left-color: #46b450;
+}
+.notice.notice-error {
+    border-left-color: #dc3232;
+}
+.loading {
+    opacity: 0.6;
+    pointer-events: none;
+}
+</style>
+
+<script>
+jQuery(document).ready(function($) {
+    var wenpaiAdmin = window.wenpaiAdmin || {};
+    
+    function showNotice(message, type) {
+        var noticeClass = type === 'success' ? 'notice-success' : 'notice-error';
+        var notice = $('<div class="notice ' + noticeClass + '"><p>' + message + '</p></div>');
+        $('#wenpai-admin-notices').html(notice);
+        setTimeout(function() {
+            notice.fadeOut();
+        }, 5000);
+    }
+    
+    function addTermToTable(term, config) {
+        var row = '<tr>' +
+            '<td>' + $('<div>').text(term).html() + '</td>' +
+            '<td>' + $('<div>').text(config.symbol).html() + '</td>' +
+            '<td>' + $('<div>').text(config.position).html() + '</td>' +
+            '<td>' + $('<div>').text(config.density).html() + '</td>' +
+            '<td>' + (config.case_sensitive ? 'Yes' : 'No') + '</td>' +
+            '<td>' + (config.whole_word ? 'Yes' : 'No') + '</td>' +
+            '<td>' +
+                '<button type="button" class="button edit-term" data-term="' + $('<div>').text(term).html() + '">Edit</button> ' +
+                '<button type="button" class="button delete-term" data-term="' + $('<div>').text(term).html() + '">Delete</button>' +
+            '</td>' +
+        '</tr>';
+        $('#terms-table tbody').append(row);
+    }
+    
+    // Add new term
+    $('#add-term').click(function() {
+        var term = $('#new-term').val().trim();
+        var symbol = $('#new-symbol').val();
+        var position = $('#new-position').val();
+        var density = parseInt($('#new-density').val());
+        var caseSensitive = $('#new-case-sensitive').is(':checked');
+        var wholeWord = $('#new-whole-word').is(':checked');
+        
+        if (!term) {
+            showNotice('Please enter a term.', 'error');
+            return;
+        }
+        
+        var termData = {
+            action: 'wenpai_save_settings',
+            nonce: wenpaiAdmin.nonce,
+            terms: {}
+        };
+        termData.terms[term] = {
+            symbol: symbol,
+            position: position,
+            density: density,
+            case_sensitive: caseSensitive,
+            whole_word: wholeWord
+        };
+        
+        $.post(wenpaiAdmin.ajaxUrl, termData, function(response) {
+            if (response.success) {
+                addTermToTable(term, termData.terms[term]);
+                $('#new-term').val('');
+                $('#new-density').val(1);
+                $('#new-case-sensitive').prop('checked', false);
+                $('#new-whole-word').prop('checked', true);
+                showNotice('Term added successfully!', 'success');
+            } else {
+                showNotice(response.data.message || 'Failed to add term.', 'error');
+            }
+        });
+    });
+    
+    // Delete term
+    $(document).on('click', '.delete-term', function() {
+        var term = $(this).data('term');
+        var row = $(this).closest('tr');
+        
+        if (!confirm(wenpaiAdmin.strings.confirmDelete)) {
+            return;
+        }
+        
+        $.post(wenpaiAdmin.ajaxUrl, {
+            action: 'wenpai_delete_term',
+            nonce: wenpaiAdmin.nonce,
+            term: term
+        }, function(response) {
+            if (response.success) {
+                row.fadeOut(function() {
+                    row.remove();
+                });
+                showNotice('Term deleted successfully!', 'success');
+            } else {
+                showNotice(response.data.message || 'Failed to delete term.', 'error');
+            }
+        });
+    });
+    
+    // Import terms
+    $('#import-terms').click(function() {
+        var fileInput = $('#csv-file')[0];
+        if (!fileInput.files.length) {
+            showNotice('Please select a CSV file.', 'error');
+            return;
+        }
+        
+        var formData = new FormData();
+        formData.append('action', 'wenpai_import_terms');
+        formData.append('nonce', wenpaiAdmin.nonce);
+        formData.append('csv_file', fileInput.files[0]);
+        
+        $.ajax({
+            url: wenpaiAdmin.ajaxUrl,
+            type: 'POST',
+            data: formData,
+            processData: false,
+            contentType: false,
+            success: function(response) {
+                if (response.success) {
+                    location.reload();
+                } else {
+                    showNotice(response.data.message || 'Import failed.', 'error');
+                }
+            }
+        });
+    });
+    
+    // Export terms
+    $('#export-terms').click(function() {
+        $.post(wenpaiAdmin.ajaxUrl, {
+            action: 'wenpai_export_terms',
+            nonce: wenpaiAdmin.nonce
+        }, function(response) {
+            if (response.success) {
+                var blob = new Blob([response.data.csv], { type: 'text/csv' });
+                var url = window.URL.createObjectURL(blob);
+                var a = document.createElement('a');
+                a.href = url;
+                a.download = 'wenpai-trademark-terms.csv';
+                a.click();
+                window.URL.revokeObjectURL(url);
+            } else {
+                showNotice(response.data.message || 'Export failed.', 'error');
+            }
+        });
+    });
+    
+    // Save settings
+    $('#submit').click(function(e) {
+        e.preventDefault();
+        
+        var formData = {
+            action: 'wenpai_save_settings',
+            nonce: wenpaiAdmin.nonce,
+            scopes: {},
+            exclude_post_ids: $('#exclude-post-ids').val(),
+            exclude_html_tags: $('#exclude-html-tags').val()
+        };
+        
+        $('input[name^="scopes["]').each(function() {
+            var name = $(this).attr('name').match(/scopes\[(.+)\]/)[1];
+            formData.scopes[name] = $(this).is(':checked');
+        });
+        
+        $.post(wenpaiAdmin.ajaxUrl, formData, function(response) {
+            if (response.success) {
+                showNotice('Settings saved successfully!', 'success');
+            } else {
+                showNotice(response.data.message || 'Failed to save settings.', 'error');
+            }
+        });
+    });
+});
+</script>

wenpai-trademark.php

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+<?php
+/**
+ * Plugin Name: WenPai Trademark Symbol
+ * Description: Automatically adds trademark, registered, or copyright symbols to specified terms with enhanced controls.
+ * Version: 2.0.0
+ * Author: WenPai.org
+ * License: GPLv3 or later
+ * Text Domain: wenpai-trademark
+ * Domain Path: /languages
+ * Requires at least: 5.0
+ * Tested up to: 6.4
+ * Requires PHP: 7.4
+ */
+
+// Prevent direct access
+if (!defined('ABSPATH')) {
+    exit;
+}
+
+// Define plugin constants
+define('WENPAI_TRADEMARK_VERSION', '2.0.0');
+define('WENPAI_TRADEMARK_PATH', \plugin_dir_path(__FILE__));
+define('WENPAI_TRADEMARK_URL', \plugin_dir_url(__FILE__));
+define('WENPAI_TRADEMARK_FILE', __FILE__);
+
+/**
+ * Main plugin class with all core functionality
+ */
+class WenpaiTrademarkPlugin {
+    
+    private static $instance = null;
+    private $replacing = false;
+    private $cached_terms = null;
+    
+    // Option constants
+    const OPTION_TERMS = 'wenpai_trademark_terms';
+    const OPTION_SCOPES = 'wenpai_trademark_scopes';
+    const OPTION_EXCLUDED_POST_IDS = 'wenpai_trademark_excluded_post_ids';
+    const OPTION_EXCLUDED_TAGS = 'wenpai_trademark_excluded_tags';
+    
+    public static function get_instance() {
+        if (null === self::$instance) {
+            self::$instance = new self();
+        }
+        return self::$instance;
+    }
+    
+    private function __construct() {
+        $this->init_hooks();
+    }
+    
+    private function init_hooks() {
+        \register_activation_hook(WENPAI_TRADEMARK_FILE, [$this, 'activate']);
+        \register_deactivation_hook(WENPAI_TRADEMARK_FILE, [$this, 'deactivate']);
+        
+        \add_action('plugins_loaded', [$this, 'init']);
+        \add_action('admin_init', [$this, 'register_settings']);
+        \add_action('wp_loaded', [$this, 'apply_filters']);
+        \add_action('admin_menu', [$this, 'register_admin_page']);
+        \add_action('admin_enqueue_scripts', [$this, 'enqueue_admin_scripts']);
+        
+        // AJAX hooks
+        \add_action('wp_ajax_wenpai_save_settings', [$this, 'ajax_save_settings']);
+        \add_action('wp_ajax_wenpai_import_terms', [$this, 'ajax_import_terms']);
+        \add_action('wp_ajax_wenpai_export_terms', [$this, 'ajax_export_terms']);
+        \add_action('wp_ajax_wenpai_delete_term', [$this, 'ajax_delete_term']);
+    }
+    
+    public function init() {
+        \load_plugin_textdomain('wenpai-trademark', false, dirname(\plugin_basename(WENPAI_TRADEMARK_FILE)) . '/languages/');
+    }
+    
+    // ========== ACTIVATION/DEACTIVATION ==========
+    
+    public function activate() {
+        $default_terms = [
+            'WordPress' => [
+                'symbol' => '®',
+                'position' => 'after',
+                'density' => 1,
+                'case_sensitive' => true,
+                'whole_word' => true
+            ]
+        ];
+        
+        \add_option(self::OPTION_TERMS, $default_terms);
+        \add_option(self::OPTION_SCOPES, [
+            'content' => true,
+            'title' => true,
+            'widgets' => false,
+            'comments' => false
+        ]);
+        \add_option(self::OPTION_EXCLUDED_POST_IDS, '');
+        \add_option(self::OPTION_EXCLUDED_TAGS, 'a,code,pre');
+        
+        \flush_rewrite_rules();
+    }
+    
+    public function deactivate() {
+        \wp_cache_flush();
+    }
+    
+    // ========== SETTINGS MANAGEMENT ==========
+    
+    public function register_settings() {
+        \register_setting('wenpai_trademark_settings', self::OPTION_TERMS, [
+            'sanitize_callback' => [$this, 'sanitize_terms'],
+            'default' => []
+        ]);
+        
+        \register_setting('wenpai_trademark_settings', self::OPTION_SCOPES, [
+            'sanitize_callback' => [$this, 'sanitize_scopes'],
+            'default' => [
+                'content' => true,
+                'title' => true,
+                'widgets' => true,
+                'comments' => true,
+            ]
+        ]);
+        
+        \register_setting('wenpai_trademark_settings', self::OPTION_EXCLUDED_POST_IDS, [
+            'sanitize_callback' => '\sanitize_text_field',
+            'default' => ''
+        ]);
+        
+        \register_setting('wenpai_trademark_settings', self::OPTION_EXCLUDED_TAGS, [
+            'sanitize_callback' => '\sanitize_text_field',
+            'default' => 'a,code,pre'
+        ]);
+    }
+    
+    public function sanitize_terms($terms) {
+        if (!is_array($terms)) {
+            return [];
+        }
+        
+        $sanitized = [];
+        foreach ($terms as $term => $data) {
+            $clean_term = \sanitize_text_field($term);
+            if (empty($clean_term)) continue;
+            
+            $sanitized[$clean_term] = [
+                'symbol' => \sanitize_text_field($data['symbol'] ?? '™'),
+                'position' => in_array($data['position'] ?? 'after', ['before', 'after']) ? $data['position'] : 'after',
+                'density' => max(1, min(10, intval($data['density'] ?? 1))),
+                'case_sensitive' => !empty($data['case_sensitive']),
+                'whole_word' => !empty($data['whole_word'])
+            ];
+        }
+        
+        return $sanitized;
+    }
+    
+    public function sanitize_scopes($scopes) {
+        if (!is_array($scopes)) {
+            return ['content' => true];
+        }
+        
+        $valid_scopes = ['content', 'title', 'widgets', 'comments'];
+        $sanitized = [];
+        
+        foreach ($valid_scopes as $scope) {
+            $sanitized[$scope] = !empty($scopes[$scope]);
+        }
+        
+        return $sanitized;
+    }
+    
+    public function get_terms() {
+        if (null === $this->cached_terms) {
+            $this->cached_terms = \get_option(self::OPTION_TERMS, []);
+        }
+        return $this->cached_terms;
+    }
+    
+    public function get_scopes() {
+        return \get_option(self::OPTION_SCOPES, ['content' => true]);
+    }
+    
+    // ========== TEXT REPLACEMENT ENGINE ==========
+    
+    public function apply_filters() {
+        $scopes = $this->get_scopes();
+        
+        if (!empty($scopes['content'])) {
+            \add_filter('the_content', [$this, 'replace_terms'], 20);
+        }
+        if (!empty($scopes['title'])) {
+            \add_filter('the_title', [$this, 'replace_terms'], 20);
+        }
+        if (!empty($scopes['widgets'])) {
+            \add_filter('widget_text', [$this, 'replace_terms'], 20);
+        }
+        if (!empty($scopes['comments'])) {
+            \add_filter('comment_text', [$this, 'replace_terms'], 20);
+        }
+    }
+    
+    public function replace_terms($text) {
+        if ($this->replacing || empty($text) || !is_string($text)) {
+            return $text;
+        }
+        
+        if ($this->should_skip_replacement()) {
+            return $text;
+        }
+        
+        $this->replacing = true;
+        
+        $terms = $this->get_terms();
+        if (empty($terms)) {
+            $this->replacing = false;
+            return $text;
+        }
+        
+        $excluded_tags = \get_option(self::OPTION_EXCLUDED_TAGS, 'a,code,pre');
+        $tags_array = array_map('trim', explode(',', $excluded_tags));
+        
+        $processed_text = $this->process_html_content($text, $terms, $tags_array);
+        
+        $this->replacing = false;
+        return $processed_text;
+    }
+    
+    private function should_skip_replacement() {
+        if (!\is_singular()) {
+            return false;
+        }
+        
+        $excluded_ids = \get_option(self::OPTION_EXCLUDED_POST_IDS, '');
+        if (empty($excluded_ids)) {
+            return false;
+        }
+        
+        $excluded_array = array_map('trim', explode(',', $excluded_ids));
+        return in_array((string)\get_the_ID(), $excluded_array);
+    }
+    
+    private function process_html_content($content, $terms, $excluded_tags) {
+        if (empty($excluded_tags)) {
+            return $this->replace_text_content($content, $terms);
+        }
+        
+        $tag_pattern = '<(' . implode('|', array_map('preg_quote', $excluded_tags)) . ')\b[^>]*>.*?</\\1>';
+        
+        return preg_replace_callback(
+            '/(' . $tag_pattern . ')|([^<]+)/is',
+            function($matches) use ($terms) {
+                if (!empty($matches[1])) {
+                    return $matches[1];
+                }
+                return $this->replace_text_content($matches[2], $terms);
+            },
+            $content
+        );
+    }
+    
+    private function replace_text_content($text, $terms) {
+        foreach ($terms as $term => $config) {
+            $pattern = $this->build_pattern($term, $config);
+            $replacement = $this->build_replacement($term, $config);
+            
+            $limit = max(1, intval($config['density']));
+            $text = preg_replace($pattern, $replacement, $text, $limit);
+        }
+        
+        return $text;
+    }
+    
+    private function build_pattern($term, $config) {
+        $escaped_term = preg_quote($term, '/');
+        
+        if (!empty($config['whole_word'])) {
+            $pattern = '/\\b' . $escaped_term . '\\b/';
+        } else {
+            $pattern = '/' . $escaped_term . '/';
+        }
+        
+        if (empty($config['case_sensitive'])) {
+            $pattern .= 'i';
+        }
+        
+        return $pattern;
+    }
+    
+    private function build_replacement($term, $config) {
+        $symbol = $config['symbol'] ?? '™';
+        $position = $config['position'] ?? 'after';
+        
+        if ($position === 'before') {
+            return $symbol . '$0';
+        }
+        
+        return '$0' . $symbol;
+    }
+    
+    // ========== ADMIN INTERFACE ==========
+    
+    public function register_admin_page() {
+        \add_options_page(
+            'WenPai Trademark Symbol Settings',
+            'Trademark Symbol',
+            'manage_options',
+            'wenpai-trademark-settings',
+            [$this, 'render_admin_page']
+        );
+    }
+    
+    public function enqueue_admin_scripts($hook) {
+        if ('settings_page_wenpai-trademark-settings' !== $hook) {
+            return;
+        }
+        
+        // Enqueue admin styles
+        \wp_enqueue_style(
+            'wenpai-admin-styles',
+            WENPAI_TRADEMARK_URL . 'admin-styles.css',
+            [],
+            WENPAI_TRADEMARK_VERSION
+        );
+        
+        // Enqueue jQuery and localize script
+        \wp_enqueue_script('jquery');
+        \wp_localize_script('jquery', 'wenpaiAdmin', [
+            'ajaxUrl' => \admin_url('admin-ajax.php'),
+            'nonce' => \wp_create_nonce('wenpai_trademark_nonce'),
+            'strings' => [
+                'confirmDelete' => 'Are you sure you want to delete this term?',
+                'importSuccess' => 'Terms imported successfully!',
+                'exportError' => 'Export failed. Please try again.',
+                'saveSuccess' => 'Settings saved successfully!',
+                'saveError' => 'Failed to save settings. Please try again.',
+            ]
+        ]);
+    }
+    
+    public function render_admin_page() {
+        if (!\current_user_can('manage_options')) {
+            return;
+        }
+        
+        include WENPAI_TRADEMARK_PATH . 'admin-template.php';
+    }
+    
+    // ========== AJAX HANDLERS ==========
+    
+    private function verify_nonce() {
+        if (!\wp_verify_nonce($_POST['nonce'] ?? '', 'wenpai_trademark_nonce')) {
+            \wp_send_json_error(['message' => 'Security check failed']);
+        }
+    }
+    
+    public function ajax_save_settings() {
+        $this->verify_nonce();
+        
+        if (!\current_user_can('manage_options')) {
+            \wp_send_json_error(['message' => 'Permission denied']);
+        }
+        
+        try {
+            if (isset($_POST['terms'])) {
+                $terms = $this->sanitize_terms($_POST['terms']);
+                \update_option(self::OPTION_TERMS, $terms);
+                $this->cached_terms = null;
+            }
+            
+            if (isset($_POST['scopes'])) {
+                $scopes = $this->sanitize_scopes($_POST['scopes']);
+                \update_option(self::OPTION_SCOPES, $scopes);
+            }
+            
+            if (isset($_POST['exclude_post_ids'])) {
+                \update_option(self::OPTION_EXCLUDED_POST_IDS, \sanitize_text_field($_POST['exclude_post_ids']));
+            }
+            
+            if (isset($_POST['exclude_html_tags'])) {
+                \update_option(self::OPTION_EXCLUDED_TAGS, \sanitize_text_field($_POST['exclude_html_tags']));
+            }
+            
+            \wp_send_json_success(['message' => 'Settings saved successfully']);
+            
+        } catch (Exception $e) {
+            \wp_send_json_error(['message' => 'Failed to save settings: ' . $e->getMessage()]);
+        }
+    }
+    
+    public function ajax_import_terms() {
+        $this->verify_nonce();
+        
+        if (!\current_user_can('manage_options')) {
+            \wp_send_json_error(['message' => 'Permission denied']);
+        }
+        
+        if (!isset($_FILES['csv_file'])) {
+            \wp_send_json_error(['message' => 'No file uploaded']);
+        }
+        
+        $file = $_FILES['csv_file'];
+        if ($file['error'] !== UPLOAD_ERR_OK) {
+            \wp_send_json_error(['message' => 'File upload error']);
+        }
+        
+        $csv_data = file_get_contents($file['tmp_name']);
+        $lines = str_getcsv($csv_data, "\n");
+        
+        $imported_terms = [];
+        foreach ($lines as $line) {
+            $data = str_getcsv($line);
+            if (count($data) >= 2) {
+                $imported_terms[trim($data[0])] = [
+                    'symbol' => trim($data[1]),
+                    'position' => isset($data[2]) ? trim($data[2]) : 'after',
+                    'density' => isset($data[3]) ? max(1, intval($data[3])) : 1,
+                    'case_sensitive' => isset($data[4]) ? !empty($data[4]) : false,
+                    'whole_word' => isset($data[5]) ? !empty($data[5]) : true
+                ];
+            }
+        }
+        
+        if (empty($imported_terms)) {
+            \wp_send_json_error(['message' => 'No valid terms found in CSV']);
+        }
+        
+        $current_terms = $this->get_terms();
+        $merged_terms = array_merge($current_terms, $imported_terms);
+        
+        \update_option(self::OPTION_TERMS, $merged_terms);
+        $this->cached_terms = null;
+        
+        \wp_send_json_success([
+            'message' => sprintf('Successfully imported %d terms', count($imported_terms)),
+            'terms' => $merged_terms
+        ]);
+    }
+    
+    public function ajax_export_terms() {
+        $this->verify_nonce();
+        
+        if (!\current_user_can('manage_options')) {
+            \wp_send_json_error(['message' => 'Permission denied']);
+        }
+        
+        $terms = $this->get_terms();
+        if (empty($terms)) {
+            \wp_send_json_error(['message' => 'No terms to export']);
+        }
+        
+        $csv_content = "Term,Symbol,Position,Density,Case Sensitive,Whole Word\n";
+        foreach ($terms as $term => $config) {
+            $csv_content .= sprintf(
+                "\"%s\",\"%s\",\"%s\",%d,%s,%s\n",
+                $term,
+                $config['symbol'],
+                $config['position'],
+                $config['density'],
+                $config['case_sensitive'] ? 'true' : 'false',
+                $config['whole_word'] ? 'true' : 'false'
+            );
+        }
+        
+        \wp_send_json_success(['csv' => $csv_content]);
+    }
+    
+    public function ajax_delete_term() {
+        $this->verify_nonce();
+        
+        if (!\current_user_can('manage_options')) {
+            \wp_send_json_error(['message' => 'Permission denied']);
+        }
+        
+        $term = \sanitize_text_field($_POST['term'] ?? '');
+        if (empty($term)) {
+            \wp_send_json_error(['message' => 'Term not specified']);
+        }
+        
+        $terms = $this->get_terms();
+        if (!isset($terms[$term])) {
+            \wp_send_json_error(['message' => 'Term not found']);
+        }
+        
+        unset($terms[$term]);
+        \update_option(self::OPTION_TERMS, $terms);
+        $this->cached_terms = null;
+        
+        \wp_send_json_success(['message' => 'Term deleted successfully']);
+    }
+}
+
+// Initialize the plugin
+WenpaiTrademarkPlugin::get_instance();