优化了一些问题

src/Content/Download.php

@@ -455,7 +455,73 @@ class Download {
     private function fail_410(): void {
         status_header(410);
         nocache_headers();
-        wp_die(esc_html__('下载链接已过期或无效，请回到资源页重新获取。', 'aksrt'), 410);
+
+        // Themed expiry page; wp_die stays only as the safety net for the
+        // paths that already streamed headers/body (send_download_headers,
+        // stream_body) where the theme chrome can no longer be emitted.
+        if (function_exists('get_header') && !headers_sent()) {
+            $this->render_expired_page();
+            exit;
+        }
+
+        wp_die(
+            esc_html__('下载链接已过期或无效，请回到资源页重新获取。', 'aksrt'),
+            esc_html__('下载链接已失效', 'aksrt'),
+            ['response' => 410]
+        );
+    }
+
+    /**
+     * Flat, theme-native 410 page. All colors resolve from the runtime CSS
+     * variables (--color-primary plus its html.dark override, legacy ink
+     * vars flipped by body.dark-theme), so the admin-configured primary
+     * color and the light/dark mode apply with no extra scripts.
+     */
+    private function render_expired_page(): void {
+        add_action('wp_head', static function (): void {
+            $css = <<<'CSS'
+.aksrt-410{display:flex;align-items:center;justify-content:center;min-height:72vh;padding:48px 20px;text-align:center}
+.aksrt-410__card{max-width:460px}
+.aksrt-410__icon{width:92px;height:92px;margin:0 auto 28px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:2.25rem;background:var(--color-primary-soft,rgba(0,0,0,.06));color:var(--color-primary,#f04494)}
+.aksrt-410__code{font-family:var(--font-display,var(--font-body,inherit));font-size:clamp(4rem,10vw,5.5rem);font-weight:800;line-height:1;letter-spacing:.02em;color:var(--muted-4-color,#d2d2d2);margin:0 0 10px}
+.aksrt-410__title{font-family:var(--font-display,inherit);font-size:clamp(20px,3vw,26px);font-weight:700;line-height:1.3;color:var(--key-color,#333);margin:0 0 12px}
+.aksrt-410__desc{font-size:15px;line-height:1.7;color:var(--muted-color,#777);margin:0 0 32px}
+.aksrt-410__actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
+.aksrt-410__actions .btn-primary,.aksrt-410__actions .btn-outline{--btn-h:42px;--btn-px:22px}
+CSS;
+            echo '<style id="aksrt-410-page">' . $css . '</style>' . "\n";
+        }, 99);
+
+        $title_filter = static function (array $parts): array {
+            $parts['title'] = __('下载链接已失效', 'aksrt');
+            return $parts;
+        };
+        add_filter('document_title_parts', $title_filter);
+
+        get_header();
+        remove_filter('document_title_parts', $title_filter);
+        ?>
+        <main id="main-content" class="aksrt-410" tabindex="-1">
+            <div class="aksrt-410__card">
+                <span class="aksrt-410__icon" aria-hidden="true"><i class="fa fas fa-hourglass-end"></i></span>
+                <p class="aksrt-410__code">410</p>
+                <h1 class="aksrt-410__title"><?php esc_html_e('下载链接已失效', 'aksrt'); ?></h1>
+                <p class="aksrt-410__desc"><?php esc_html_e('下载链接已过期或无效，请回到资源页重新获取。', 'aksrt'); ?></p>
+                <div class="aksrt-410__actions">
+                    <a href="javascript:history.back()" class="btn-primary">
+                        <i class="fa fas fa-arrow-left" aria-hidden="true"></i>
+                        <span><?php esc_html_e('返回上一页', 'aksrt'); ?></span>
+                    </a>
+                    <a href="<?php echo esc_url(home_url('/')); ?>" class="btn-outline">
+                        <i class="fa fas fa-home" aria-hidden="true"></i>
+                        <span><?php esc_html_e('返回首页', 'aksrt'); ?></span>
+                    </a>
+                </div>
+            </div>
+        </main>
+        <?php
+        get_footer();
+        exit;
     }
 
     private function issue_token(int $user_id, int $post_id, int $source_index, int $cost, array $config = []) {