diff --git a/.gitignore b/.gitignore
index ba0b509c..d129bf2d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,4 +21,8 @@ restore-helper-monoliths.php
 # OS / editor noise
 .DS_Store
 Thumbs.db
-*.log
\ No newline at end of file
+*.log
+
+
+# Generated contract audit artifact
+tools/admin-contract-report.json
diff --git a/inc/classes/class-aksrt-admin.php b/inc/classes/class-aksrt-admin.php
index ebfb4909..25dcf8cb 100644
--- a/inc/classes/class-aksrt-admin.php
+++ b/inc/classes/class-aksrt-admin.php
@@ -66,6 +66,37 @@ class AKSRT_Admin {
 
         $build_dir = trailingslashit(AKSRT_DIR) . 'assets/admin/build/';
         $build_uri = trailingslashit(AKSRT_URI) . 'assets/admin/build/';
+        $entry = $build_dir . 'index.js';
+
+        if (!is_file($entry)) {
+            add_action('admin_notices', static function (): void {
+                if (!current_user_can('manage_options')) {
+                    return;
+                }
+                echo '<div class="notice notice-error"><p>';
+                echo esc_html__('AKSRT 管理后台构建缺失：请在 assets/admin 执行 npm run build，并完整部署 build/ 目录。', 'aksrt');
+                echo '</p></div>';
+            });
+            return;
+        }
+
+        $missing_chunks = self::find_missing_admin_chunks($build_dir, $entry);
+        if ($missing_chunks !== []) {
+            add_action('admin_notices', static function () use ($missing_chunks): void {
+                if (!current_user_can('manage_options')) {
+                    return;
+                }
+                echo '<div class="notice notice-error"><p>';
+                echo esc_html__('AKSRT 管理后台构建不完整（动态模块缺失），请重新完整部署 assets/admin/build/，不要只覆盖 index.js。缺失：', 'aksrt');
+                echo ' ' . esc_html(implode(', ', array_slice($missing_chunks, 0, 8)));
+                if (count($missing_chunks) > 8) {
+                    echo '…';
+                }
+                echo '</p></div>';
+            });
+            // Still enqueue entry so console shows the real import error if an admin insists;
+            // notice makes the deploy mistake explicit.
+        }
 
         $css_files = [
             'naive-ui.css',
@@ -84,28 +115,51 @@ class AKSRT_Admin {
             }
         }
 
-        $entry = $build_dir . 'index.js';
-        if (file_exists($entry)) {
-            wp_enqueue_script(
-                'aksrt-admin-app',
-                $build_uri . 'index.js',
-                [],
-                (string) filemtime($entry),
-                true
-            );
+        wp_enqueue_script(
+            'aksrt-admin-app',
+            $build_uri . 'index.js',
+            [],
+            (string) filemtime($entry),
+            true
+        );
 
-            wp_localize_script('aksrt-admin-app', 'aksrtAdminData', [
-                'apiUrl'       => esc_url_raw(rest_url(self::API_NAMESPACE)),
-                'nonce'        => wp_create_nonce('wp_rest'),
-                'siteUrl'      => home_url('/'),
-                'adminUrl'     => admin_url('/'),
-                'themeVersion' => wp_get_theme()->get('Version') ?: '3.4.0-dev',
-            ]);
-        }
+        wp_localize_script('aksrt-admin-app', 'aksrtAdminData', [
+            'apiUrl'       => esc_url_raw(rest_url(self::API_NAMESPACE)),
+            'nonce'        => wp_create_nonce('wp_rest'),
+            'siteUrl'      => home_url('/'),
+            'adminUrl'     => admin_url('/'),
+            'themeVersion' => wp_get_theme()->get('Version') ?: '3.4.0-dev',
+            'buildOk'      => $missing_chunks === [],
+        ]);
 
         wp_enqueue_media();
     }
 
+    /**
+     * Parse index.js dynamic imports and report missing chunk files.
+     *
+     * @return string[]
+     */
+    private static function find_missing_admin_chunks(string $build_dir, string $entry_file): array {
+        $src = file_get_contents($entry_file);
+        if (!is_string($src) || $src === '') {
+            return ['index.js unreadable'];
+        }
+
+        if (!preg_match_all('/\\.\\/([A-Za-z0-9_.-]+\\.js)/', $src, $matches)) {
+            return [];
+        }
+
+        $missing = [];
+        foreach (array_unique($matches[1]) as $chunk) {
+            if (!is_file($build_dir . $chunk)) {
+                $missing[] = $chunk;
+            }
+        }
+
+        return $missing;
+    }
+
     public function add_module_type_attribute(string $tag, string $handle): string {
         if ('aksrt-admin-app' === $handle) {
             return str_replace('<script ', '<script type="module" ', $tag);
diff --git a/tools/admin-contract-map.md b/tools/admin-contract-map.md
new file mode 100644
index 00000000..ff67c29b
--- /dev/null
+++ b/tools/admin-contract-map.md
@@ -0,0 +1,51 @@
+# Admin contract map
+
+Generated by process, not a migration guide. Source of truth for menu ↔ schema wiring.
+
+## Rules
+
+1. Every `schemaPage` must have matching PHP section under the same domain.
+2. Enum field values must be identical in PHP schema and JS schema.
+3. REST `'callback' => [$this, 'method']` methods must exist (class or trait).
+4. Deploy `assets/admin/build/` as one atomic unit after `npm run build`.
+5. No compat aliases, dual-read, or silent frontend catch for missing APIs.
+
+## Audit
+
+```bash
+php tools/audit-admin-contracts.php
+```
+
+Exit code `1` means hard contract errors.
+
+## Domain builders
+
+| Domain | PHP builder map key | Menu constants file |
+|--------|---------------------|---------------------|
+| global | `AKSRT_Admin_Schema_Global` | `assets/admin/src/constants/sections/global.js` |
+| page_display | `AKSRT_Admin_Schema_Page_Display` | `page-display.js` |
+| post_list | `AKSRT_Admin_Schema_Post_List` | `post-list.js` |
+| permissions | `AKSRT_Admin_Schema_Permissions` | `permissions.js` |
+| users | `AKSRT_Admin_Schema_Users` | `users.js` |
+| payment | `AKSRT_Admin_Schema_Payment` | `payment.js` |
+| extensions | `AKSRT_Admin_Schema_Extensions` | `extensions.js` |
+| tools | `AKSRT_Admin_Schema_Tools` | `tools.js` |
+| shop | `AKSRT_Admin_Schema_Shop` | `shop.js` |
+| forum | `AKSRT_Admin_Schema_Forum` | `forum.js` |
+
+## Known custom pages (not schema REST)
+
+These use dedicated Vue pages + dedicated REST modules:
+
+- Homepage: `HomepageSettings` + `/settings/homepage`
+- Footer: `FooterSettings` + footer settings API
+- Permissions capabilities matrix: `PermissionsCapabilities` + `/permissions/capabilities`
+- Shop products/orders and other operational tables
+
+## Deploy checklist
+
+1. `cd assets/admin && npm ci && npm run build`
+2. Confirm `build/index.js` and every dynamically imported `./Chunk.hash.js` exist
+3. Replace the entire remote `assets/admin/build/` directory
+4. Hard-refresh wp-admin (or purge CDN)
+5. Re-run `php tools/audit-admin-contracts.php`
diff --git a/tools/audit-admin-contracts.php b/tools/audit-admin-contracts.php
new file mode 100644
index 00000000..6ce5a68c
--- /dev/null
+++ b/tools/audit-admin-contracts.php
@@ -0,0 +1,424 @@
+<?php
+/**
+ * Admin contract audit — menu ↔ PHP schema ↔ REST $this callbacks ↔ build integrity.
+ *
+ * Usage (from theme root):
+ *   php tools/audit-admin-contracts.php
+ *
+ * Exit 1 on hard errors.
+ */
+
+declare(strict_types=1);
+
+$themeRoot = dirname(__DIR__);
+$errors = [];
+$warnings = [];
+$info = [];
+
+function rel(string $path, string $root): string {
+    return str_replace('\\', '/', ltrim(str_replace($root, '', $path), '\\/'));
+}
+
+/**
+ * Extract section keys from composite schema builders (including delegated leaf builders).
+ *
+ * @return array<string, array{sections: string[], files: string[]}>
+ */
+function collect_php_schema_sections(string $themeRoot): array {
+    $map = [];
+
+    $register = static function (string $domain, string $section, string $file) use (&$map, $themeRoot): void {
+        if ($domain === '' || $section === '') {
+            return;
+        }
+        if (!isset($map[$domain])) {
+            $map[$domain] = ['sections' => [], 'files' => []];
+        }
+        $map[$domain]['sections'][$section] = true;
+        $fileRel = rel($file, $themeRoot);
+        if (!in_array($fileRel, $map[$domain]['files'], true)) {
+            $map[$domain]['files'][] = $fileRel;
+        }
+    };
+
+    // Primary domain builders.
+    $primary = [
+        'global'       => $themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-global.php',
+        'page_display' => $themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-page-display.php',
+        'post_list'    => $themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-post-list.php',
+        'permissions'  => $themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-permissions.php',
+        'users'        => $themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-users.php',
+        'payment'      => $themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-payment.php',
+        'extensions'   => $themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-extensions.php',
+        'tools'        => $themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-tools.php',
+        'shop'         => $themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-shop.php',
+        'forum'        => $themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-forum.php',
+    ];
+
+    foreach ($primary as $domain => $file) {
+        if (!is_file($file)) {
+            continue;
+        }
+        $src = file_get_contents($file);
+        if ($src === false) {
+            continue;
+        }
+        // Direct section keys: 'foo' => [ or 'foo' => Class::build()
+        if (preg_match_all("/'([a-z0-9_-]+)'\\s*=>\\s*(?:\\[|[A-Za-z0-9_]+::build\\(\\))/", $src, $m)) {
+            foreach ($m[1] as $section) {
+                if (in_array($section, ['domain', 'title', 'version', 'option_key', 'key', 'sections', 'groups', 'fields'], true)) {
+                    continue;
+                }
+                $register($domain, $section, $file);
+            }
+        }
+    }
+
+    // Leaf builders that return a single section with 'key' => 'section-id'
+    $leafFiles = glob($themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-*.php') ?: [];
+    foreach ($leafFiles as $file) {
+        $src = file_get_contents($file);
+        if ($src === false) {
+            continue;
+        }
+        // Skip pure composites that only delegate.
+        $isComposite = (bool) preg_match("/'sections'\\s*=>\\s*\\[/", $src);
+        if ($isComposite) {
+            continue;
+        }
+        if (!preg_match("/'key'\\s*=>\\s*'([a-z0-9_-]+)'/", $src, $km)) {
+            continue;
+        }
+        $section = $km[1];
+        // Infer domain from filename: class-aksrt-admin-schema-{domain}-{section}.php
+        $base = basename($file, '.php');
+        $base = preg_replace('/^class-aksrt-admin-schema-/', '', $base);
+        $parts = explode('-', $base);
+        // domain may be multi-token (page_display is page-display in menus but page_display in PHP).
+        // Prefer matching known domains by prefix.
+        $domain = null;
+        foreach (array_keys($primary) as $candidate) {
+            $candidateDash = str_replace('_', '-', $candidate);
+            if ($base === $candidateDash || str_starts_with($base, $candidateDash . '-')) {
+                $domain = $candidate;
+                break;
+            }
+        }
+        if ($domain === null) {
+            // Fallback: first token.
+            $domain = str_replace('-', '_', $parts[0] ?? '');
+        }
+        $register($domain, $section, $file);
+    }
+
+    foreach ($map as $domain => $payload) {
+        $map[$domain]['sections'] = array_keys($payload['sections']);
+        sort($map[$domain]['sections']);
+    }
+
+    return $map;
+}
+
+function collect_menu_pages(string $themeRoot): array {
+    $dir = $themeRoot . '/assets/admin/src/constants/sections';
+    $pages = [];
+    foreach (glob($dir . '/*.js') ?: [] as $file) {
+        $base = basename($file);
+        if (in_array($base, ['helpers.js', 'index.js'], true)) {
+            continue;
+        }
+        $src = file_get_contents($file);
+        if ($src === false) {
+            continue;
+        }
+        foreach (['schemaPage' => 'schemaPage', 'customPage' => 'customPage', 'deferredPage' => 'deferredPage'] as $fn => $kind) {
+            if (!preg_match_all('/' . $fn . '\\(\\s*\\{([\\s\\S]*?)\\}\\s*\\)/', $src, $blocks)) {
+                continue;
+            }
+            foreach ($blocks[1] as $block) {
+                $page = ['file' => rel($file, $themeRoot), 'kind' => $kind];
+                foreach (['key', 'canonicalDomain', 'section', 'route', 'component', 'name'] as $prop) {
+                    if (preg_match('/' . $prop . ":\\s*'([^']*)'/", $block, $m)) {
+                        $page[$prop === 'canonicalDomain' ? 'domain' : $prop] = $m[1];
+                    }
+                }
+                $pages[] = $page;
+            }
+        }
+    }
+    return $pages;
+}
+
+/**
+ * Collect enum options for fields with balanced-enough heuristics:
+ * only consider field objects that include both type radio|select and an options array
+ * on nearby lines, keyed by the field key property.
+ *
+ * @return array{php: array<string, string[]>, js: array<string, string[]>}
+ */
+function collect_enum_maps(string $themeRoot): array {
+    $php = [];
+    $js = [];
+
+    $phpFiles = glob($themeRoot . '/inc/classes/admin/schema/class-aksrt-admin-schema-*.php') ?: [];
+    foreach ($phpFiles as $file) {
+        $src = file_get_contents($file);
+        if ($src === false) {
+            continue;
+        }
+        // Split roughly by field array starts: ['key' => '...'
+        if (!preg_match_all("/\\['key'\\s*=>\\s*'([^']+)'([\\s\\S]*?)(?=\\['key'\\s*=>|\\]\\s*,\\s*\\[\\s*'key'|\\]\\s*\\]\\s*,\\s*\\[\\s*'key'|$)/", $src, $chunks, PREG_SET_ORDER)) {
+            continue;
+        }
+        foreach ($chunks as $chunk) {
+            $key = $chunk[1];
+            $body = $chunk[2];
+            if (!preg_match("/'type'\\s*=>\\s*'(radio|select)'/", $body)) {
+                continue;
+            }
+            if (!preg_match("/'options'\\s*=>\\s*\\[([\\s\\S]*?)\\]/", $body, $om)) {
+                continue;
+            }
+            $values = [];
+            if (preg_match_all("/'value'\\s*=>\\s*'([^']*)'/", $om[1], $vm)) {
+                $values = $vm[1];
+            }
+            // Keep first definition; warn later if duplicates differ.
+            if (!isset($php[$key])) {
+                $php[$key] = $values;
+            }
+        }
+    }
+
+    $jsRoot = $themeRoot . '/assets/admin/src/schema/sections';
+    if (is_dir($jsRoot)) {
+        $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($jsRoot, FilesystemIterator::SKIP_DOTS));
+        foreach ($iterator as $file) {
+            if ($file->getExtension() !== 'js') {
+                continue;
+            }
+            $src = file_get_contents($file->getPathname());
+            if ($src === false) {
+                continue;
+            }
+            if (!preg_match_all("/\\{\\s*key:\\s*'([^']+)'([\\s\\S]*?)(?=\\{\\s*key:\\s*'|$)/", $src, $chunks, PREG_SET_ORDER)) {
+                continue;
+            }
+            foreach ($chunks as $chunk) {
+                $key = $chunk[1];
+                $body = $chunk[2];
+                // Stop body at next field-ish boundary if options not closed well.
+                if (!preg_match("/type:\\s*'(radio|select)'/", $body)) {
+                    continue;
+                }
+                if (!preg_match("/options:\\s*\\[([\\s\\S]*?)\\]/", $body, $om)) {
+                    continue;
+                }
+                $values = [];
+                if (preg_match_all("/value:\\s*'([^']*)'/", $om[1], $vm)) {
+                    $values = $vm[1];
+                }
+                if (!isset($js[$key])) {
+                    $js[$key] = $values;
+                }
+            }
+        }
+    }
+
+    return ['php' => $php, 'js' => $js];
+}
+
+function collect_missing_this_callbacks(string $themeRoot): array {
+    $issues = [];
+    $adminRoot = $themeRoot . '/inc/classes/admin';
+    $methodIndex = [];
+
+    $allPhp = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($adminRoot, FilesystemIterator::SKIP_DOTS));
+    foreach ($allPhp as $file) {
+        if ($file->getExtension() !== 'php') {
+            continue;
+        }
+        $src = file_get_contents($file->getPathname());
+        if ($src === false) {
+            continue;
+        }
+        if (preg_match_all('/function\\s+([a-zA-Z_][a-zA-Z0-9_]*)\\s*\\(/', $src, $mm)) {
+            foreach ($mm[1] as $method) {
+                $methodIndex[$method] = true;
+            }
+        }
+    }
+
+    foreach ($allPhp as $file) {
+        if ($file->getExtension() !== 'php') {
+            continue;
+        }
+        $path = $file->getPathname();
+        $src = file_get_contents($path);
+        if ($src === false) {
+            continue;
+        }
+        if (!preg_match_all("/'callback'\\s*=>\\s*\\[\\s*\\\$this\\s*,\\s*'([^']+)'\\s*\\]/", $src, $matches)) {
+            continue;
+        }
+        foreach ($matches[1] as $method) {
+            if (empty($methodIndex[$method])) {
+                $issues[] = [
+                    'file'   => rel($path, $themeRoot),
+                    'method' => $method,
+                ];
+            }
+        }
+    }
+
+    return $issues;
+}
+
+function audit_build_manifest(string $themeRoot): array {
+    $buildDir = $themeRoot . '/assets/admin/build';
+    $result = [
+        'present' => is_dir($buildDir),
+        'entry'   => false,
+        'missing_chunks' => [],
+        'chunks'  => [],
+    ];
+    if (!$result['present']) {
+        return $result;
+    }
+    $entry = $buildDir . '/index.js';
+    $result['entry'] = is_file($entry);
+    if (!$result['entry']) {
+        return $result;
+    }
+    $src = file_get_contents($entry);
+    if ($src === false) {
+        return $result;
+    }
+    if (preg_match_all('/\\.\\/([A-Za-z0-9_.-]+\\.js)/', $src, $m)) {
+        $result['chunks'] = array_values(array_unique($m[1]));
+        foreach ($result['chunks'] as $chunk) {
+            if (!is_file($buildDir . '/' . $chunk)) {
+                $result['missing_chunks'][] = $chunk;
+            }
+        }
+    }
+    return $result;
+}
+
+$phpSchemas = collect_php_schema_sections($themeRoot);
+$menuPages = collect_menu_pages($themeRoot);
+$enums = collect_enum_maps($themeRoot);
+$restIssues = collect_missing_this_callbacks($themeRoot);
+$build = audit_build_manifest($themeRoot);
+
+$info[] = 'PHP schema domains: ' . implode(', ', array_keys($phpSchemas));
+$info[] = 'Menu pages discovered: ' . count($menuPages);
+
+foreach ($menuPages as $page) {
+    if (($page['kind'] ?? '') !== 'schemaPage') {
+        continue;
+    }
+    $domain = $page['domain'] ?? '';
+    $section = $page['section'] ?? '';
+    $key = $page['key'] ?? '(unknown)';
+    if ($domain === '' || $section === '') {
+        $errors[] = "schemaPage {$key} missing canonicalDomain/section in {$page['file']}";
+        continue;
+    }
+    if (!isset($phpSchemas[$domain])) {
+        $errors[] = "schemaPage {$key} domain '{$domain}' has no PHP schema builder";
+        continue;
+    }
+    if (!in_array($section, $phpSchemas[$domain]['sections'], true)) {
+        $errors[] = "schemaPage {$key} section '{$domain}/{$section}' missing in PHP schema; known=[" . implode(',', $phpSchemas[$domain]['sections']) . '] files=' . implode(',', $phpSchemas[$domain]['files']);
+    }
+}
+
+foreach ($menuPages as $page) {
+    if (($page['kind'] ?? '') !== 'customPage') {
+        continue;
+    }
+    $domain = $page['domain'] ?? '';
+    $section = $page['section'] ?? '';
+    if ($domain === '' || $section === '') {
+        continue;
+    }
+    if (!isset($phpSchemas[$domain])) {
+        $warnings[] = "customPage {$page['key']} references domain '{$domain}' without PHP schema map entry";
+        continue;
+    }
+    if (!in_array($section, $phpSchemas[$domain]['sections'], true)) {
+        $warnings[] = "customPage {$page['key']} section '{$domain}/{$section}' not in PHP schema (ok if pure operational page)";
+    }
+}
+
+// Enum mismatches only for shared keys with non-empty option sets on both sides.
+// Heuristic parsers often capture only the default option from dense PHP arrays;
+// treat "PHP is a non-empty proper subset of JS" as a parser warning, not a hard error.
+// Hard error when sets are disjoint or PHP introduces values JS does not have.
+$shared = array_intersect(array_keys($enums['php']), array_keys($enums['js']));
+sort($shared);
+foreach ($shared as $key) {
+    $phpValues = $enums['php'][$key];
+    $jsValues = $enums['js'][$key];
+    if ($phpValues === [] && $jsValues === []) {
+        continue;
+    }
+    $phpSorted = $phpValues;
+    $jsSorted = $jsValues;
+    sort($phpSorted);
+    sort($jsSorted);
+    if ($phpSorted === $jsSorted) {
+        continue;
+    }
+    $phpOnly = array_values(array_diff($phpValues, $jsValues));
+    $jsOnly = array_values(array_diff($jsValues, $phpValues));
+    if ($phpOnly === [] && $jsOnly !== [] && $phpValues !== []) {
+        $warnings[] = "enum incomplete parse for '{$key}' (php subset of js): php=[" . implode(',', $phpValues) . '] js=[' . implode(',', $jsValues) . ']';
+        continue;
+    }
+    $errors[] = "enum mismatch for '{$key}': php=[" . implode(',', $phpValues) . '] js=[' . implode(',', $jsValues) . '] php_only=[' . implode(',', $phpOnly) . '] js_only=[' . implode(',', $jsOnly) . ']';
+}
+
+foreach ($restIssues as $issue) {
+    $errors[] = "REST \$this callback missing: {$issue['method']} in {$issue['file']}";
+}
+
+if (!$build['present']) {
+    $warnings[] = 'assets/admin/build/ missing — run: cd assets/admin && npm run build';
+} elseif (!$build['entry']) {
+    $errors[] = 'assets/admin/build/index.js missing';
+} elseif ($build['missing_chunks']) {
+    $errors[] = 'admin build missing chunks: ' . implode(', ', $build['missing_chunks']);
+} else {
+    $info[] = 'admin build ok; chunks=' . count($build['chunks']);
+}
+
+echo "AKSRT admin contract audit\n";
+echo str_repeat('=', 48) . "\n";
+foreach ($info as $line) {
+    echo "[info] {$line}\n";
+}
+foreach ($warnings as $line) {
+    echo "[warn] {$line}\n";
+}
+foreach ($errors as $line) {
+    echo "[error] {$line}\n";
+}
+echo str_repeat('-', 48) . "\n";
+echo 'errors=' . count($errors) . ' warnings=' . count($warnings) . "\n";
+
+$summaryPath = $themeRoot . '/tools/admin-contract-report.json';
+file_put_contents($summaryPath, json_encode([
+    'generated_at' => gmdate('c'),
+    'errors'       => $errors,
+    'warnings'     => $warnings,
+    'info'         => $info,
+    'domains'      => $phpSchemas,
+    'page_count'   => count($menuPages),
+    'build'        => $build,
+], JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
+echo "wrote tools/admin-contract-report.json\n";
+
+// Ignore report in git by default? Keep it for CI artifact; do not commit noise if huge.
+exit(count($errors) > 0 ? 1 : 0);