diff --git a/popup-theme.css b/popup-theme.css
new file mode 100644
index 0000000..5c9b440
--- /dev/null
+++ b/popup-theme.css
@@ -0,0 +1,83 @@
+/* api#353 / Preland: согласованный светлый канон PDF/guest-quota.
+ * Геометрию, состояния и тёмную тему задают существующие компоненты.
+ * Этот файл совпадает с popup-theme.css прелендингов. */
+body:not(.theme-dark) {
+  --popup-surface: linear-gradient(180deg, #edf4fd, #faf0fa);
+  --popup-title: #202334;
+  --popup-text: #4b4f61;
+  --popup-focus: #6439aa;
+  --popup-shadow: 0 24px 80px rgb(25 31 49 / 18%);
+  --popup-border: rgb(25 31 49 / 12%);
+}
+
+body:not(.theme-dark) .input-choice-popup,
+body:not(.theme-dark) .upload-error-popup,
+body:not(.theme-dark) .dp-overlay {
+  background: rgb(25 31 49 / 35%);
+}
+body:not(.theme-dark) .modal-backdrop { background: #191f31; }
+body:not(.theme-dark) .modal-backdrop.show { opacity: .35; }
+
+body:not(.theme-dark) .input-choice-popup .input-choice-card,
+body:not(.theme-dark) .upload-error-popup .upload-error-card,
+body:not(.theme-dark) .modal-payment .modal-content,
+body:not(.theme-dark) .dp-dialog {
+  background: var(--popup-surface);
+  color: var(--popup-title);
+  color-scheme: light;
+  border-color: var(--popup-border);
+  box-shadow: var(--popup-shadow);
+}
+
+body:not(.theme-dark) .input-choice-popup h2,
+body:not(.theme-dark) .input-choice-popup .input-choice-option,
+body:not(.theme-dark) .modal-payment .close,
+body:not(.theme-dark) .dp-close,
+body:not(.theme-dark) .dp-retry {
+  color: var(--popup-title);
+  text-shadow: none;
+}
+body:not(.theme-dark) .input-choice-popup .input-choice-lead,
+body:not(.theme-dark) .input-choice-popup .input-choice-or,
+body:not(.theme-dark) .upload-error-popup p,
+body:not(.theme-dark) .upload-error-popup .upload-error-close,
+body:not(.theme-dark) .payment-modal-message-text span {
+  color: var(--popup-text);
+}
+body:not(.theme-dark) .input-choice-popup .input-choice-other {
+  color: #007bff;
+}
+body:not(.theme-dark) .input-choice-popup .input-choice-error {
+  color: #c8322b;
+}
+body:not(.theme-dark) .payment-modal-link {
+  color: var(--popup-title);
+  background: rgb(255 255 255 / 80%);
+}
+body:not(.theme-dark) .payment-modal-link:hover {
+  color: var(--popup-title);
+  background: #fff;
+}
+
+body:not(.theme-dark) .input-choice-popup button:focus-visible,
+body:not(.theme-dark) .input-choice-popup input:focus-visible,
+body:not(.theme-dark) .upload-error-popup button:focus-visible,
+body:not(.theme-dark) .upload-error-popup a:focus-visible,
+body:not(.theme-dark) .modal-payment button:focus-visible,
+body:not(.theme-dark) .modal-payment a:focus-visible,
+body:not(.theme-dark) .dp-dialog button:focus-visible {
+  outline: 2px solid var(--popup-focus);
+  outline-offset: 3px;
+}
+body:not(.theme-dark) .dp-input {
+  color: var(--popup-title);
+  background: #fff;
+  border-color: #ced4da;
+}
+body:not(.theme-dark) .dp-input::placeholder { color: #6c757d; }
+body:not(.theme-dark) .dp-input:focus { border-color: #3d87e3; }
+body:not(.theme-dark) .dp-input:focus-visible {
+  outline: 2px solid var(--popup-focus);
+  outline-offset: 2px;
+}
+body:not(.theme-dark) .dp-input.dp-invalid { border-color: #c8322b; }
diff --git a/release/assets.json b/release/assets.json
index 55d0ebd..5d3811b 100644
--- a/release/assets.json
+++ b/release/assets.json
@@ -3,6 +3,10 @@
     "captured": "2026-10-21",
     "hashing": "SHA-256; SVG/CSS/HTML/webmanifest CRLF normalized to LF",
     "files": {
+        "popup-theme.css": {
+            "sha256": "4d8ed6e142dacf34da6d61394c8dee0297309a8eb570000cd8549bc0c920df4c",
+            "source": "api#353: approved popup light theme"
+        },
         "1/01_desk_1-source.avif": {
             "sha256": "d81af6d3757d0e932af04d956cd4083e7c7c547c9fbac290d27f5ce8bbaede1c",
             "source": "https://zoomstage.online/1/01_desk_1-source.avif"
diff --git a/template.php b/template.php
index 8a7b095..8a7a4fb 100644
--- a/template.php
+++ b/template.php
@@ -50,6 +50,7 @@
 		<link rel="preload" as="image" href="<?= $urlResOrig ?>" media="(min-width: 768px)" type="image/avif" fetchpriority="high">
 
         <style><?= file_get_contents(__DIR__ . '/style.min.css'); ?></style>
+        <style><?= file_get_contents(__DIR__ . '/popup-theme.css'); ?></style>
         <style><?= require __DIR__ . '/components/upload-picker-style.php'; ?></style>
         <?php require_once __DIR__ . '/components/browser-upload.php'; ?>
     </head>