diff --git a/src/App.tsx b/src/App.tsx
index cbf32d3..6ef182e 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -21,8 +21,12 @@ import { QuestionsPresentPage } from "./pages/QuestionsPresentPage";
 import { CodeEntryPage } from "./pages/CodeEntryPage";
 import { PrivacyPolicyPage } from "./pages/PrivacyPolicyPage";
 import { TermsOfServicePage } from "./pages/TermsOfServicePage";
+import { useEventTheme } from "./hooks/useEventTheme";
 
 export default function App() {
+  // Re-apply theme from stored visitor context on refresh / navigation.
+  useEventTheme();
+
   return (
     <div className="flex min-h-dvh flex-1 flex-col">
       <Routes>
diff --git a/src/components/AgendaRowTrackV2.tsx b/src/components/AgendaRowTrackV2.tsx
index 06e2bf9..60e5a34 100644
--- a/src/components/AgendaRowTrackV2.tsx
+++ b/src/components/AgendaRowTrackV2.tsx
@@ -35,8 +35,8 @@ export type AgendaRowTrackV2Data = {
 export function AgendaRowTrackV2({ row }: { row: AgendaRowTrackV2Data }) {
   const [detailsOpen, setDetailsOpen] = useState(false);
   const joinBtnClass = row.joinLive
-    ? "inline-flex h-8 w-[84px] items-center justify-between rounded-full bg-[#e67e00] pl-[18px] pr-2 text-xs font-semibold uppercase text-white shadow-[0_0_0_2px_rgba(239,141,29,0.5),0_4px_14px_rgba(239,141,29,0.45)] ring-2 ring-[#ffb347]/40"
-    : "inline-flex h-8 w-[84px] items-center justify-between rounded-full bg-[#ef8d1d] pl-[18px] pr-2 text-xs font-semibold uppercase text-white shadow-[0_4px_4px_rgba(0,0,0,0.15)]";
+    ? "inline-flex h-8 w-[84px] items-center justify-between rounded-full bg-[var(--theme-button-color)] pl-[18px] pr-2 text-xs font-semibold uppercase text-white shadow-[0_0_0_2px_rgba(239,141,29,0.5),0_4px_14px_rgba(239,141,29,0.45)] ring-2 ring-[var(--theme-button-color)]/40"
+    : "inline-flex h-8 w-[84px] items-center justify-between rounded-full bg-[var(--theme-button-color)] transition-colors duration-300 ease-in-out hover:bg-[var(--theme-button-color)]/90 pl-[18px] pr-2 text-xs font-semibold uppercase text-white shadow-[0_4px_4px_rgba(0,0,0,0.15)]";
 
   return (
     <div className="relative w-full pb-4">
diff --git a/src/components/AskQuestionModal.tsx b/src/components/AskQuestionModal.tsx
index dc23260..af90e79 100644
--- a/src/components/AskQuestionModal.tsx
+++ b/src/components/AskQuestionModal.tsx
@@ -79,7 +79,7 @@ export function AskQuestionModal({
         role="dialog"
         aria-modal="true"
         aria-labelledby={`ask-question-title${idSuffix}`}
-        className="relative z-10 w-full max-w-[min(100%,402px)] rounded-t-2xl bg-white px-5 pb-8 pt-5 shadow-[0_-8px_32px_rgba(0,0,0,0.12)] sm:mx-4 sm:rounded-2xl sm:shadow-xl"
+        className="relative z-10 w-full max-w-[min(100%,402px)] rounded-t-2xl bg-whit card-bg px-5 pb-8 pt-5 shadow-[0_-8px_32px_rgba(0,0,0,0.12)] sm:mx-4 sm:rounded-2xl sm:shadow-xl"
       >
         <div className="mb-4 flex items-start justify-between gap-3">
           <div className="min-w-0">
@@ -92,7 +92,7 @@ export function AskQuestionModal({
           </div>
           <button
             type="button"
-            className="shrink-0 rounded-full p-1.5 text-[#24282f] hover:bg-[#f2f2f7]"
+            className="shrink-0 rounded-full p-1.5 text-[#24282f] transition-colors duration-300 ease-in-out hover:bg-[#e4e4e4]"
             aria-label="Close"
             onClick={close}
           >
@@ -110,13 +110,13 @@ export function AskQuestionModal({
             placeholder="Type your question here..."
             rows={5}
             disabled={submitting}
-            className="min-h-[120px] w-full resize-y rounded-xl border border-[#c7c7cc] bg-[#f2f2f7]/40 px-3 py-3 text-sm text-[#24282f] placeholder:text-[rgba(36,40,47,0.45)] focus:border-[#ef8d1d] focus:outline-none focus:ring-2 focus:ring-[#ef8d1d]/30 disabled:opacity-60"
+            className="min-h-[120px] w-full resize-y rounded-xl border border-[#c7c7cc] bg-[#f2f2f7]/40 px-3 py-3 text-sm text-[#24282f] placeholder:text-[rgba(36,40,47,0.45)] transition-all duration-300 ease-in-out focus:border-[#ef8d1d focus:border-[var(--theme-button-color)] focus:outline-none focus:ring-2 focus:ring-[#ef8d1d]/30 focus:ring-[var(--theme-button-color)]/30 disabled:opacity-60"
           />
           {submitError ? <p className="text-sm text-red-600">{submitError}</p> : null}
           <button
             type="submit"
             disabled={submitting}
-            className="w-full rounded-xl bg-[#ef8d1d] py-3 text-sm font-semibold text-white shadow-[0_4px_4px_rgba(0,0,0,0.12)] transition hover:bg-[#e0800c] active:scale-[0.99] disabled:opacity-60"
+            className="w-full rounded-xl bg-[#ef8d1 bg-[var(--theme-button-color)] py-3 text-sm font-semibold text-white shadow-[0_4px_4px_rgba(0,0,0,0.12)] transition-all duration-300 ease-in-out  hover:bg-[#e0800c] transition hover:bg-[var(--theme-button-color)]/90 active:scale-[0.99] disabled:opacity-60"
           >
             {submitting ? "Submitting…" : "Submit Question"}
           </button>
diff --git a/src/components/AudienceQuestionCard.tsx b/src/components/AudienceQuestionCard.tsx
index f4cd6d3..c86e12b 100644
--- a/src/components/AudienceQuestionCard.tsx
+++ b/src/components/AudienceQuestionCard.tsx
@@ -53,7 +53,7 @@ export function AudienceQuestionCard({
   const shell =
     variant === "embedded"
       ? "flex flex-col gap-4 p-4"
-      : "flex flex-col gap-4 rounded-md border border-[#f2f2f7] bg-white p-4 shadow-[0_1px_4px_rgba(12,12,13,0.05)]";
+      : "flex flex-col gap-4 rounded-md border border-[#f2f2f7] card-bg p-4 shadow-[0_1px_4px_rgba(12,12,13,0.05)]";
 
   const doVote = useCallback(
     async (direction: "up" | "down") => {
diff --git a/src/components/DynamicFeedbackForm.tsx b/src/components/DynamicFeedbackForm.tsx
index cd34139..ce7213b 100644
--- a/src/components/DynamicFeedbackForm.tsx
+++ b/src/components/DynamicFeedbackForm.tsx
@@ -101,7 +101,7 @@ export function DynamicFeedbackForm({
   const fieldShell =
     variant === "gradient"
       ? "rounded-xl bg-white p-6 shadow-[0_8px_12px_6px_rgba(0,0,0,0.15),0_4px_4px_rgba(0,0,0,0.3)]"
-      : "rounded-md bg-white p-4 shadow-[0_1px_4px_rgba(12,12,13,0.05)]";
+      : "rounded-md bg-whit card-bg p-4 shadow-[0_1px_4px_rgba(12,12,13,0.05)]";
 
   return (
     <form onSubmit={onSubmit} className={fieldShell}>
@@ -120,7 +120,7 @@ export function DynamicFeedbackForm({
       <button
         type="submit"
         disabled={submitting}
-        className="mt-4 w-full rounded-full bg-[#ef8d1d] py-3 text-xs font-semibold uppercase tracking-wide text-white shadow-[0_4px_4px_rgba(0,0,0,0.15)] disabled:opacity-60"
+        className="mt-4 w-full rounded-full bg-[var(--theme-button-color)] py-3 text-xs font-semibold uppercase tracking-wide text-white shadow-[0_4px_4px_rgba(0,0,0,0.15)] transition-colors duration-300 ease-in-out hover:bg-[var(--theme-button-color)]/90 disabled:opacity-60"
       >
         {submitting ? "Submitting…" : "Submit"}
       </button>
@@ -154,7 +154,7 @@ function FieldInput({
   const t = (f.type || "text").toLowerCase();
 
   const baseInput =
-    "w-full rounded-lg border border-[rgba(116,112,112,0.3)] bg-[rgba(157,157,172,0.07)] px-3 py-2 font-inter text-sm text-[#24282f] placeholder:text-[rgba(36,40,47,0.45)]";
+    "w-full rounded-lg border border-[rgba(116,112,112,0.3)] bg-[rgba(157,157,172,0.07)] px-3 py-2 font-inter text-sm text-[#24282f] transition-all duration-300 ease-in-out focus:border-[#ef8d1d focus:border-[var(--theme-button-color)] focus:outline-none focus:ring-2 focus:ring-[#ef8d1d]/30 focus:ring-[var(--theme-button-color)]/30 placeholder:text-[rgba(36,40,47,0.45)]";
 
   if (t === "file") {
     return (
@@ -182,11 +182,11 @@ function FieldInput({
                 key={star}
                 type="button"
                 onClick={() => onChange(label, star)}
-                className="text-[#ef8d1d]"
+                className="text-[var(--theme-button-color)]"
                 aria-label={`${star} star${star === 1 ? "" : "s"}`}
               >
                 <Star
-                  className={`size-7 ${star <= selected ? "fill-[#ef8d1d]" : "fill-transparent"}`}
+                  className={`size-7 ${star <= selected ? "fill-[var(--theme-button-color)]" : "fill-transparent"}`}
                   strokeWidth={1.75}
                 />
               </button>
diff --git a/src/components/EventLandingAgenda.tsx b/src/components/EventLandingAgenda.tsx
index 8443747..d01b79e 100644
--- a/src/components/EventLandingAgenda.tsx
+++ b/src/components/EventLandingAgenda.tsx
@@ -172,7 +172,7 @@ export function LandingAgendaCards({
         return (
           <div
             key={day.dateKey}
-            className="w-full rounded-lg border-x-0 border-[rgba(116,112,112,0.2)] bg-white shadow-sm sm:border-x"
+            className="w-full rounded-lg border-x-0 border-[rgba(116,112,112,0.2)] bg-whit card-bg shadow-sm sm:border-x"
           >
             <button
               type="button"
@@ -216,7 +216,7 @@ export function LandingAgendaCards({
                       ) : null}
                     </div>
                     <div className="relative mt-3 w-full max-w-none px-0">
-                      <div className="relative w-full max-w-none rounded-none bg-[#fafafa] p-4 shadow-[0_1px_4px_rgba(12,12,13,0.05)] sm:rounded-md">
+                      <div className="relative w-full max-w-none rounded-none bg-[#fafafa p-4 shadow-[0_1px_4px_rgba(12,12,13,0.05)] sm:rounded-md">
                         <div className="flex w-full flex-col gap-4">
                           {tg.sessions.map((s) => (
                             <AgendaRowTrackV2
diff --git a/src/components/HeaderMobile.tsx b/src/components/HeaderMobile.tsx
index 7e8b755..915d597 100644
--- a/src/components/HeaderMobile.tsx
+++ b/src/components/HeaderMobile.tsx
@@ -140,7 +140,7 @@ export function HeaderMobile({
             <button
               type="button"
               onClick={() => (onBack ? onBack() : navigate(-1))}
-              className="flex size-10 shrink-0 items-center justify-center rounded-full bg-[#f2f2f7] text-[#1d66ef]"
+              className="flex size-10 shrink-0 items-center justify-center rounded-full bg-[#f2f2f7] text-[#777777] transition-colors duration-300 ease-in-out hover:bg-[#e4e4e4]"
               aria-label="Back"
             >
               <ChevronLeft className="size-6" strokeWidth={2} />
@@ -169,9 +169,9 @@ export function HeaderMobile({
           <div className="flex shrink-0 items-center justify-end gap-2 sm:gap-4">
             <Link
               to={rewardsHref}
-              className="flex items-center gap-1.5 rounded-full border border-[#ef8d1d] px-3 py-2 sm:gap-2 sm:px-4"
+              className="flex items-center gap-1.5 rounded-full border border-[var(--theme-button-color)] transition-all duration-300 ease-in-out hover:bg-[var(--theme-button-color)]/5 px-3 py-2 sm:gap-2 sm:px-4"
             >
-              <Trophy className="size-5 shrink-0 text-[#ef8d1d] sm:size-6" strokeWidth={1.75} />
+              <Trophy className="size-5 shrink-0 text-[var(--theme-button-color)] sm:size-6" strokeWidth={1.75} />
               <span className="min-w-[1.25rem] text-sm font-medium tabular-nums tracking-wide text-[#24282f]">
                 {pointsLabel}
               </span>
@@ -179,7 +179,7 @@ export function HeaderMobile({
             <button
               type="button"
               onClick={handleLogout}
-              className="flex size-10 shrink-0 items-center justify-center rounded-full bg-[#ef8d1d] text-white"
+              className="flex size-10 shrink-0 items-center justify-center rounded-full bg-[var(--theme-button-color)] transition-colors duration-300 ease-in-out hover:bg-[var(--theme-button-color)]/90 text-white"
               aria-label="Sign out"
             >
               <LogOut className="size-5 sm:size-6" strokeWidth={2} />
diff --git a/src/components/MobileShell.tsx b/src/components/MobileShell.tsx
index def253b..09c25b6 100644
--- a/src/components/MobileShell.tsx
+++ b/src/components/MobileShell.tsx
@@ -16,7 +16,7 @@ export function MobileShell({
 }: MobileShellProps) {
   return (
     <div
-      className={`mx-auto flex min-h-dvh w-full max-w-[402px] flex-1 flex-col bg-[#f2f2f7] ${className}`}
+      className={`mx-auto flex min-h-dvh w-full max-w-[402px] flex-1 flex-col bg-[#f2f2f7 bg-transparent ${className}`}
     >
       <div className="flex min-h-0 flex-1 flex-col">{children}</div>
       {showPoweredByFooter ? <PoweredByFooter /> : null}
diff --git a/src/components/SessionQuestionsCard.tsx b/src/components/SessionQuestionsCard.tsx
index 204a8df..d4e9a88 100644
--- a/src/components/SessionQuestionsCard.tsx
+++ b/src/components/SessionQuestionsCard.tsx
@@ -93,7 +93,7 @@ export function SessionQuestionsCard({
 
   return (
     <section
-      className="relative z-10 flex w-full max-w-none flex-col gap-4 rounded-lg border border-[rgba(116,112,112,0.2)] bg-white py-4 shadow-sm"
+      className="relative z-10 flex w-full max-w-none flex-col gap-4 rounded-lg border border-[rgba(116,112,112,0.2)] bg-whit card-bg py-4 shadow-sm"
       data-name="Session Questions"
     >
       <div className="flex h-8 items-center justify-between gap-2 px-4">
@@ -150,7 +150,7 @@ export function SessionQuestionsCard({
         {viewAllTo ? (
           <Link
             to={viewAllTo}
-            className="font-inter text-xs font-semibold uppercase tracking-wider text-[#1e72ef]"
+            className="font-inter text-xs font-semibold uppercase tracking-wider text-[#1e72e theme-btn-link"
           >
             View All
           </Link>
@@ -163,7 +163,7 @@ export function SessionQuestionsCard({
           type="button"
           onClick={() => live && setAskModalOpen(true)}
           disabled={!live}
-          className="shrink-0 rounded-lg bg-[#ef8d1d] px-3 py-2 text-xs font-semibold text-white shadow-[0_2px_4px_rgba(0,0,0,0.1)] transition hover:bg-[#e0800c] disabled:opacity-50"
+          className="shrink-0 rounded-lg bg-[#ef8d1 bg-[var(--theme-button-color)] px-3 py-2 text-xs font-semibold text-white shadow-[0_2px_4px_rgba(0,0,0,0.1)] transition-all duration-300 ease-in-out hover:bg-[#e0800c] transition hover:bg-[var(--theme-button-color)]/90 disabled:opacity-50"
         >
           Ask your Question
         </button>
diff --git a/src/components/SessionQuizPollsSection.tsx b/src/components/SessionQuizPollsSection.tsx
index a6df256..6d9b2a8 100644
--- a/src/components/SessionQuizPollsSection.tsx
+++ b/src/components/SessionQuizPollsSection.tsx
@@ -44,7 +44,7 @@ export function SessionQuizPollsSection({ eventId, sessionId }: SessionQuizPolls
     }).toString()}`;
 
   return (
-    <div className="w-full max-w-none rounded-lg border border-[rgba(116,112,112,0.2)] bg-white shadow-sm">
+    <div className="w-full max-w-none rounded-lg border border-[rgba(116,112,112,0.2)] bg-whit card-bg shadow-sm">
       <button
         type="button"
         className="flex w-full items-center justify-between gap-2 px-4 py-3 text-left"
@@ -58,9 +58,9 @@ export function SessionQuizPollsSection({ eventId, sessionId }: SessionQuizPolls
           </span>
         </div>
         {open ? (
-          <ChevronUp className="size-4 shrink-0 text-[#1d66ef]" strokeWidth={2} />
+          <ChevronUp className="size-4 shrink-0 text-[#24282f]" strokeWidth={2} />
         ) : (
-          <ChevronDown className="size-4 shrink-0 text-[#1d66ef]" strokeWidth={2} />
+          <ChevronDown className="size-4 shrink-0 text-[#24282f]" strokeWidth={2} />
         )}
       </button>
 
@@ -91,7 +91,7 @@ export function SessionQuizPollsSection({ eventId, sessionId }: SessionQuizPolls
                   </div>
                   <Link
                     to={takeHref(item._id)}
-                    className="shrink-0 rounded bg-[#0b4dd1] px-3 py-1.5 text-center text-xs font-semibold text-white transition hover:bg-[#0a43b8]"
+                    className="shrink-0 rounded bg-[#0b4dd theme-btn-bg px-3 py-1.5 text-center text-xs font-semibold text-white transition hover:bg-[#0a43b8]"
                   >
                     {actionLabel(item.type)}
                   </Link>
diff --git a/src/hooks/useEventTheme.ts b/src/hooks/useEventTheme.ts
new file mode 100644
index 0000000..f809296
--- /dev/null
+++ b/src/hooks/useEventTheme.ts
@@ -0,0 +1,22 @@
+import { useEffect } from "react";
+import { applyEventTheme, clearEventTheme } from "../theme/eventTheme";
+import type { EventThemeConfig } from "../types/visitorContext";
+import { readStoredVisitorContext } from "../types/visitorContext";
+
+/**
+ * Applies event theme CSS variables to `<html>`.
+ * When `theme` is omitted, uses theme from stored visitor context (if any).
+ */
+export function useEventTheme(theme?: EventThemeConfig | null) {
+  useEffect(() => {
+    const resolved = theme ?? readStoredVisitorContext()?.event?.theme ?? null;
+    if (resolved) {
+      applyEventTheme(resolved);
+    }
+    return () => {
+      // Keep vars while navigating between themed event pages;
+      // only clear when an explicit null theme is passed.
+      if (theme === null) clearEventTheme();
+    };
+  }, [theme]);
+}
diff --git a/src/index.css b/src/index.css
index 47b3bee..d60dddc 100644
--- a/src/index.css
+++ b/src/index.css
@@ -15,15 +15,20 @@
 
 html {
   min-height: 100dvh;
-  background-color: #f2f2f7;
+  background-color: var(--theme-bg-color, #f2f2f7);
+  background-image: var(--theme-bg-image, none);
+  background-size: var(--theme-bg-size, auto);
+  background-repeat: var(--theme-bg-repeat, no-repeat);
+  background-position: var(--theme-bg-position, center center);
+  background-attachment: fixed;
 }
 
 body {
   margin: 0;
   min-height: 100dvh;
-  font-family: var(--font-sans);
+  font-family: var(--theme-body-font, var(--font-sans));
   color: var(--color-eb-text);
-  background-color: #f2f2f7;
+  background: transparent;
   -webkit-font-smoothing: antialiased;
 }
 
@@ -31,35 +36,42 @@ body {
   display: flex;
   flex-direction: column;
   min-height: 100dvh;
-  background-color: #f2f2f7;
+  background: transparent;
 }
 
 .eb-gradient-banner {
   background: linear-gradient(
     34.8deg,
-    rgb(29, 102, 239) 0%,
-    rgb(30, 121, 240) 45%,
-    rgb(189, 53, 230) 100%
+    var(--theme-primary-color, rgb(29, 102, 239)) 0%,
+    var(--theme-primary-color, rgb(30, 121, 240)) 45%,
+    var(--theme-secondary-color, rgb(189, 53, 230)) 100%
   );
 }
 
 .eb-gradient-fab {
   background: linear-gradient(
     65deg,
-    rgb(29, 102, 239) 0%,
-    rgb(30, 121, 240) 40%,
-    rgb(189, 53, 230) 100%
+    var(--theme-primary-color, rgb(29, 102, 239)) 0%,
+    var(--theme-primary-color, rgb(30, 121, 240)) 40%,
+    var(--theme-secondary-color, rgb(189, 53, 230)) 100%
   );
 }
 
 /* Auth / modal shells (Figma EventBuzz_Event_Mobile_V1_Register) */
 .eb-gradient-auth {
-  background: linear-gradient(
-    77.92deg,
-    rgb(29, 102, 239) 0%,
-    rgb(30, 121, 240) 45%,
-    rgb(189, 53, 230) 100%
+  background-color: var(--theme-bg-color, transparent);
+  background-image: var(
+    --theme-bg-image,
+    linear-gradient(
+      77.92deg,
+      rgb(29, 102, 239) 0%,
+      rgb(30, 121, 240) 45%,
+      rgb(189, 53, 230) 100%
+    )
   );
+  background-size: var(--theme-bg-size, cover);
+  background-repeat: var(--theme-bg-repeat, no-repeat);
+  background-position: var(--theme-bg-position, center center);
 }
 
 /* Rewards / Leaderboard “Total Points” card */
@@ -116,6 +128,36 @@ body {
   animation: eb-live-blink 1.2s ease-in-out infinite;
 }
 
+.card-bg {
+  background-color: var(--theme-card-color, #ffffff);
+  color: var(--theme-card-text-color, #333333);
+  backdrop-filter: blur(10px);
+}
+.theme-btn-bg {
+  background-color: var(--theme-button-color, #ef8d1d);
+  color: var(--theme-button-text-color, #ffffff);
+}
+.theme-btn-link {
+  color: var(--theme-button-color, #ef8d1d);
+  text-decoration: underline;
+  text-underline-offset: 2px;
+  text-decoration-thickness: 1px;
+  text-decoration-color: var(--theme-button-color, #ef8d1d);
+  text-decoration-style: solid;
+  text-decoration-skip-ink: none;
+  text-decoration-skip-ink: none;
+}
+/* @layer utilities {
+  .btn-bg {
+    background-color: var(--theme-button-color, #ef8d1d);
+    color: var(--theme-button-text-color, #ffffff);
+  }
+  .btn-bg:hover {
+    background-color: var(--theme-primary-color, #ef8d1d);
+    color: var(--theme-button-text-color, #ffffff);
+  }
+} */
+
 @keyframes eb-live-blink {
   0%,
   100% {
diff --git a/src/lib/api.ts b/src/lib/api.ts
index 440083b..0d3c0b5 100644
--- a/src/lib/api.ts
+++ b/src/lib/api.ts
@@ -1,7 +1,102 @@
 import type { AttendeeParticipant } from "./attendeeAuth";
 import { getAttendeeToken } from "./attendeeAuth";
+import { applyEventTheme } from "../theme/eventTheme";
 import type { LoginPreviewResponse, ResolveCodeResponse, VisitorJoinType } from "../types/visitorContext";
 
+/** Temporary test payload for getVisitorLoginPreview — remove when wiring live API again. */
+const LOGIN_PREVIEW_SAMPLE: LoginPreviewResponse = {
+  _id: "69ce3c91be56b4a3b09b2333",
+  organization: "69b58b13aff81b3887b0026c",
+  name: "COPD Conference",
+  description: "COPD Conference in various locations joined using Zoom",
+  type: "conference",
+  status: "upcoming",
+  startDate: "2026-06-25T12:00:00.000Z",
+  endDate: "2026-09-04T12:00:00.000Z",
+  location:
+    "Stratawiz Technologies Pvt Ltd, First Floor, D-Building, Anant Shilp Society, DSK Raanwaara Rd, Patil Nagar, Bavdhan, Pune, Maharashtra 411021",
+  locationType: "virtual",
+  tags: [],
+  image:
+    "https://did94hhhcgq1d.cloudfront.net/eventbuzz/69b58b13aff81b3887b0026c/69ce3c91be56b4a3b09b2333/event/logo/event-logo-1775123603963.png",
+  bannerImage:
+    "https://did94hhhcgq1d.cloudfront.net/eventbuzz/69b58b13aff81b3887b0026c/69ce3c91be56b4a3b09b2333/event/banner/event-banner-1782452674436.png",
+  metadata: {
+    totalRevenue: 0,
+    rating: 3.9,
+    ratingCount: 8,
+    registrationCustomFields: [],
+  },
+  category: undefined,
+  virtualLink: "https://zoom.us",
+  subtitle: undefined,
+  settings: {
+    registrationOpen: true,
+    requiresApproval: false,
+    registrationMode: "Open",
+    verifyEmail: false,
+    registrationDeadline: "2026-09-12T12:00:00.000Z",
+    enableFeedback: true,
+    enableRatings: true,
+    authenticationType: "none",
+    registrationBaseFields: "name_email",
+  },
+  logoUrl:
+    "https://did94hhhcgq1d.cloudfront.net/eventbuzz/69b58b13aff81b3887b0026c/69ce3c91be56b4a3b09b2333/event/logo/event-logo-1775123603963.png",
+  ratings: {
+    average: 3.9,
+    count: 8,
+  },
+  // theme: {
+  //   "theme": "simple",
+  //   "color": "#151937",
+  //   "font": "Roboto",
+  //   "primaryColor": "#303F9F",
+  //   "secondaryColor": "#4CAF50",
+  //   "headerColor": "",
+  //   "buttonColor": "#2c357a",
+  //   "textColor": "#ffffff",
+  //   "textHighlightColor": "",
+  //   "cardColor": "rgba(255,255,255,0.65)",
+  //   "cardTextColor": "#ffffff"
+  // },
+  // theme: {
+  //   theme: "gradient",
+  //   color: "#bd35e6",
+  //   // "gradient": {
+  // 	//   "color1": "#1e72ef",
+  // 	//   "color2": "#ef8d1d"
+  //   // },
+  //   font: "Open Sans",
+  //   primaryColor: "#1e72ef",
+  //   secondaryColor: "#bd35e6",
+  //   headerColor: "",
+  //   buttonColor: "#1e72ef",
+  //   textColor: "#ffffff",
+  //   textHighlightColor: "",
+  //   cardColor: "rgba(255, 255, 255, 0.9)",
+  //   cardTextColor: "#333333",
+  // },
+  theme: {
+    theme: "background",
+    color: "#1e72ef",
+    background: {
+      url: "https://did94hhhcgq1d.cloudfront.net/rapport/backgrounds/eventbuzz-bg2.jpg",
+      size: "cover",
+      repeat: "no",
+    },
+    font: "Poppins",
+    primaryColor: "#1e72ef",
+    secondaryColor: "#bd35e6",
+    headerColor: "",
+    buttonColor: "#1e72ef",
+    textColor: "#ffffff",
+    textHighlightColor: "",
+    cardColor: "rgba(255, 255, 255, 0.9)",
+    cardTextColor: "#333333",
+  },
+};
+
 function getBaseUrl(): string {
   const raw = import.meta.env.VITE_API_BASE_URL;
   if (typeof raw !== "string" || !raw.trim()) return "";
@@ -55,17 +150,25 @@ export async function postVisitorResolveCode(code: string): Promise<ResolveCodeR
 }
 
 export async function getVisitorLoginPreview(eventId: string): Promise<LoginPreviewResponse> {
-  const base = getBaseUrl();
-  const url = `${base}/api/visitor/events/${encodeURIComponent(eventId)}/login-preview`;
-  const res = await fetch(url);
-  const body = await parseJson(res);
-  if (!res.ok) {
-    throw new Error(messageFromBody(body));
-  }
-  if (!body || typeof body !== "object" || !("data" in body)) {
-    throw new Error("Invalid response");
-  }
-  return (body as { data: LoginPreviewResponse }).data;
+  // TODO: restore live API call below once theme testing is done
+  void eventId;
+  const data = LOGIN_PREVIEW_SAMPLE;
+  if (data.theme) applyEventTheme(data.theme);
+  return data;
+
+  // const base = getBaseUrl();
+  // const url = `${base}/api/visitor/events/${encodeURIComponent(eventId)}/login-preview`;
+  // const res = await fetch(url);
+  // const body = await parseJson(res);
+  // if (!res.ok) {
+  //   throw new Error(messageFromBody(body));
+  // }
+  // if (!body || typeof body !== "object" || !("data" in body)) {
+  //   throw new Error("Invalid response");
+  // }
+  // const data = (body as { data: LoginPreviewResponse }).data;
+  // if (data?.theme) applyEventTheme(data.theme);
+  // return data;
 }
 
 export type VisitorEventTrackListItem = {
diff --git a/src/pages/EventLandingPage.tsx b/src/pages/EventLandingPage.tsx
index 6b14870..684b837 100644
--- a/src/pages/EventLandingPage.tsx
+++ b/src/pages/EventLandingPage.tsx
@@ -149,15 +149,15 @@ export function EventLandingPage() {
       <HeaderMobile logoUrl={event.logoUrl} eventId={eventId || null} showBack={false} />
       <EventBanner imageUrl={bannerSrc} alt={event.name} />
 
-      <main className="relative z-0 flex w-full max-w-none flex-1 flex-col bg-[#f2f2f7] pb-8 pt-6">
+      <main className="relative z-0 flex w-full max-w-none flex-1 flex-col bg-[#f2f2f pb-8 pt-6">
         <div className="flex w-full max-w-none flex-col gap-6">
           <section className="w-full">
-            <div className="w-full rounded-lg border border-[rgba(116,112,112,0.2)] bg-white p-4 shadow-sm">
+            <div className="w-full rounded-lg border border-[rgba(116,112,112,0.2)] bg-whit card-bg p-4 shadow-sm">
               <h1 className="text-lg font-semibold text-[#24282f]">{event.name}</h1>
               <div className="mt-2 flex flex-wrap items-center gap-2 text-xs">
                 <EventRatingBadge ratings={event.ratings} />
                 {reg.enableRatings ? (
-                  <Link to={ratingsHref} className="font-inter font-semibold uppercase tracking-wide text-[#1e72ef]">
+                  <Link to={ratingsHref} className="font-inter font-semibold uppercase tracking-wide text-[#1e72e theme-btn-link">
                     rate now
                   </Link>
                 ) : (
@@ -167,7 +167,7 @@ export function EventLandingPage() {
               <p className="mt-3 text-base leading-5 text-[rgba(36,40,47,0.87)]">
                 {event.description?.trim() || event.subtitle?.trim() || "Welcome to this event."}
               </p>
-              <button type="button" className="mt-2 font-inter text-xs font-semibold uppercase tracking-wide text-[#1e72ef]">
+              <button type="button" className="mt-2 font-inter text-xs font-semibold uppercase tracking-wide text-[#1e72e theme-btn-link">
                 Read More
               </button>
               <div className="mt-4 flex flex-col gap-2 border-t border-[#f2f2f7] pt-4 text-xs text-[#24282f]">
@@ -188,7 +188,7 @@ export function EventLandingPage() {
           {bookmarkedIds.size > 0 ? (
             <section className="w-full">
               <div className="w-full px-4">
-                <h2 className="font-inter text-base font-semibold text-[#24282f]">My Sessions</h2>
+                <h2 className="font-inter text-base font-semibold text-[var(--theme-text-color)]">My Sessions</h2>
               </div>
               {agendaLoading && !agendaSessions.length ? (
                 <p className="mt-3 px-4 text-sm text-[rgba(36,40,47,0.55)]">Loading…</p>
@@ -205,7 +205,7 @@ export function EventLandingPage() {
 
           <section className="w-full">
             <div className="w-full px-4">
-              <h2 className="font-inter text-base font-semibold text-[#24282f]">Agenda</h2>
+              <h2 className="font-inter text-base font-semibold text-[var(--theme-text-color)]">Agenda</h2>
             </div>
             {agendaErr ? (
               <p className="mt-3 px-4 text-sm text-red-600">{agendaErr}</p>
diff --git a/src/pages/FeedbackPage.tsx b/src/pages/FeedbackPage.tsx
index 3510dc2..ea52b8a 100644
--- a/src/pages/FeedbackPage.tsx
+++ b/src/pages/FeedbackPage.tsx
@@ -124,9 +124,9 @@ export function FeedbackPage() {
   return (
     <MobileShell className="relative">
       <HeaderMobile logoUrl={eventSnapshot?.logoUrl} eventId={eventId || null} />
-      <main className="flex flex-1 flex-col bg-[#f2f2f7] px-4 pb-10 pt-6">
+      <main className="flex flex-1 flex-col bg-[#f2f2f7 bg-transparent px-4 pb-10 pt-6">
         <div className="mx-auto w-full max-w-[370px]">
-          <h1 className="font-inter text-xl font-semibold text-[#24282f]">{schema?.name || "Feedback"}</h1>
+          <h1 className="font-inter text-xl font-semibold text-[var(--theme-text-color)]">{schema?.name || "Feedback"}</h1>
           {schemaLoading ? (
             <p className="mt-4 text-sm text-[rgba(36,40,47,0.67)]">Loading form…</p>
           ) : schemaErr ? (
diff --git a/src/pages/LeaderboardPage.tsx b/src/pages/LeaderboardPage.tsx
index 4eed419..b2e1a88 100644
--- a/src/pages/LeaderboardPage.tsx
+++ b/src/pages/LeaderboardPage.tsx
@@ -81,7 +81,7 @@ export function LeaderboardPage() {
         <Award className="size-[68px] text-amber-300" strokeWidth={1.25} />
         <h1 className="mt-1 font-inter text-xl font-semibold text-white">Leaderboard</h1>
 
-        <div className="mt-6 w-full max-w-[354px] rounded-xl bg-white shadow-[0_8px_12px_6px_rgba(0,0,0,0.15),0_4px_4px_rgba(0,0,0,0.3)]">
+        <div className="mt-6 w-full max-w-[354px] rounded-xl bg-whit card-bg shadow-[0_8px_12px_6px_rgba(0,0,0,0.15),0_4px_4px_rgba(0,0,0,0.3)]">
           <div className="p-4">
             <div className="eb-rank-highlight flex flex-col gap-2 rounded-3xl border-4 border-white px-4 py-4 text-white shadow-[0_9px_16px_rgba(0,0,0,0.14)]">
               <p className="text-center font-inter text-base font-semibold uppercase tracking-wide">Your rank</p>
@@ -89,7 +89,7 @@ export function LeaderboardPage() {
                 <span className="font-inter text-5xl font-bold drop-shadow-[0_4px_4px_rgba(0,0,0,0.25)]">
                   {!signedIn ? "—" : loading ? "…" : yourRank != null ? yourRank : "—"}
                 </span>
-                <span className="rounded-xl bg-[#cff7d3] px-4 py-3 text-xs font-medium text-[#009951] shadow-sm">
+                <span className="rounded-xl bg-[#cff7d3] px-4 py-2 text-sm font-medium text-[#009951] shadow-sm">
                   {!signedIn
                     ? "Sign in"
                     : loading
@@ -133,7 +133,7 @@ export function LeaderboardPage() {
 
         <Link
           to={eventId ? `/rewards?event_id=${encodeURIComponent(eventId)}` : "/rewards"}
-          className="mt-6 font-inter font-semibold text-white underline"
+          className="mt-6 font-inter font-semibold text-[var(--theme-text-color)] underline"
         >
           Rewards
         </Link>
diff --git a/src/pages/LoginPage.tsx b/src/pages/LoginPage.tsx
index 4415441..1c010f9 100644
--- a/src/pages/LoginPage.tsx
+++ b/src/pages/LoginPage.tsx
@@ -240,9 +240,9 @@ export function LoginPage() {
     <AuthShell>
       <div className="flex w-full max-w-[354px] flex-col items-center">
         <div className="w-full rounded-xl shadow-[0_8px_12px_6px_rgba(0,0,0,0.15),0_4px_4px_rgba(0,0,0,0.3)]">
-          <div className="rounded-xl bg-white">
+          <div className="rounded-xl bg-whit card-bg">
             <div className="px-6 pb-2 pt-6">
-              <div className="flex h-[103px] items-center justify-center rounded-xl border border-[#f2f2f7] px-4">
+              <div className="flex h-[103px] items-center justify-center rounded-xl border border-[#f2f2f border-[var(--theme-card-color)]/25 px-4">
                 {preview?.logoUrl ? (
                   <img
                     src={preview.logoUrl}
@@ -256,13 +256,13 @@ export function LoginPage() {
             </div>
             <form onSubmit={handleSubmit} className="flex flex-col gap-8 px-6 pb-8 pt-2">
               <div className="flex flex-col items-center gap-4 text-center">
-                <p className="font-inter text-base font-semibold text-[#24282f]">Log in to</p>
+                <p className="font-inte text-base font-semibold text-[#24282f]">Log in to</p>
                 <div className="min-w-0 space-y-1">
-                  <p className="font-inter text-[28px] font-bold leading-tight text-[#24282f] sm:text-[32px]">
+                  <p className="font-inte text-[28px] font-bold leading-tight text-[#24282f] sm:text-[32px]">
                     {headline}
                   </p>
                   {preview?.subtitle ? (
-                    <p className="font-inter text-sm font-medium text-[#24282f]/80">{preview.subtitle}</p>
+                    <p className="font-inte text-sm font-medium text-[#24282f]/80">{preview.subtitle}</p>
                   ) : null}
                 </div>
                 {previewError ? (
@@ -280,7 +280,7 @@ export function LoginPage() {
                     {schedule ? (
                       <>
                         <Calendar className="size-4 shrink-0" strokeWidth={1.75} />
-                        <span className="font-inter">{schedule}</span>
+                        <span className="font-inte">{schedule}</span>
                       </>
                     ) : null}
                     {schedule && preview?.location?.trim() ? (
@@ -289,7 +289,7 @@ export function LoginPage() {
                     {preview?.location?.trim() ? (
                       <>
                         <MapPin className="size-4 shrink-0" strokeWidth={1.75} />
-                        <span className="font-inter">{preview.location.trim()}</span>
+                        <span className="font-inte">{preview.location.trim()}</span>
                       </>
                     ) : null}
                   </div>
@@ -298,25 +298,25 @@ export function LoginPage() {
 
               {showInviteField ? (
                 <label className="flex flex-col gap-2">
-                  <span className="font-inter text-sm font-semibold text-[#24282f]">Invite code</span>
+                  <span className="font-inte text-sm font-semibold text-[#24282f]">Invite code</span>
                   <input
                     value={inviteInput}
                     onChange={(e) => setInviteInput(e.target.value)}
                     placeholder="Enter your invite code"
-                    className="h-[44px] w-full rounded-lg border border-[rgba(116,112,112,0.3)] bg-[rgba(157,157,172,0.07)] px-4 font-inter text-sm text-[#24282f]"
+                    className="h-[44px] w-full rounded-lg border border-[rgba(116,112,112,0.3)] bg-[rgba(157,157,172,0.07)] px-4 font-inter text-sm text-[#24282f] transition-colors duration-300 ease-in-out focus:border-[var(--theme-button-color)] focus:outline-none focus:ring-2 focus:ring-[var(--theme-button-color)]/30"
                   />
                 </label>
               ) : null}
 
               {showEmail ? (
                 <label className="flex flex-col gap-2">
-                  <span className="font-inter text-base font-semibold text-[#24282f]">Email address</span>
+                  <span className="font-inte text-base font-semibold text-[#24282f]">Email address</span>
                   <input
                     type="email"
                     value={email}
                     onChange={(e) => setEmail(e.target.value)}
                     placeholder="Enter your email address"
-                    className="h-[51px] w-full rounded-lg border border-[rgba(116,112,112,0.3)] bg-[rgba(157,157,172,0.07)] px-4 font-inter text-sm tracking-wide text-[#24282f] placeholder:text-[rgba(36,40,47,0.6)]"
+                    className="h-[51px] w-full rounded-lg border border-[rgba(116,112,112,0.3)] bg-[rgba(157,157,172,0.07)] px-4 font-inte text-sm tracking-wide text-[#24282f] placeholder:text-[rgba(36,40,47,0.6)] transition-colors duration-300 ease-in-out focus:border-[var(--theme-button-color)] focus:outline-none focus:ring-2 focus:ring-[var(--theme-button-color)]/30"
                   />
                 </label>
               ) : null}
@@ -335,7 +335,7 @@ export function LoginPage() {
               <button
                 type="submit"
                 disabled={loading || loadingPreview}
-                className="w-full rounded-full border border-[rgba(214,200,200,0.6)] bg-[#ef8d1d] py-3 text-xs font-semibold uppercase tracking-wide text-white shadow-[0_4px_4px_rgba(0,0,0,0.15)] disabled:opacity-60"
+                className="w-full rounded-full border border-[rgba(214,200,200,0.6)] bg-[var(--theme-button-color)] py-3 text-xs font-semibold uppercase tracking-wide text-white shadow-[0_4px_4px_rgba(0,0,0,0.15)] transition-colors duration-300 ease-in-out hover:bg-[var(--theme-button-color)]/90 disabled:opacity-60"
               >
                 {loading ? "Please wait…" : reg.primaryCtaLabel}
               </button>
diff --git a/src/pages/Questions.tsx b/src/pages/Questions.tsx
index d06acb5..bfad81d 100644
--- a/src/pages/Questions.tsx
+++ b/src/pages/Questions.tsx
@@ -137,28 +137,31 @@ export function Questions() {
     <MobileShell className="relative">
       <HeaderMobile logoUrl={headerLogoUrl} eventId={eventId || null} />
 
-      <main className="relative z-0 flex flex-1 flex-col bg-[#f2f2f7] pb-28 pt-6">
-        <div className="mx-auto w-full max-w-[370px] px-4">
-          <div className="mb-1 inline-flex w-fit rounded bg-[#e5e5ea] px-2 py-0.5">
-            <span className="text-[10px] tracking-wide text-[#24282f]">Audience questions</span>
+      <main className="relative z-0 flex flex-1 flex-col bg-[#f2f2f card-b  pb-28 pt-6">
+        <div className="mx-auto w-full max-w-[370px] px-3">
+          <div className="flex flex-col gap-2 card-bg p-4 rounded-md">
+          
+            <div className="mb-1 inline-flex w-fit rounded bg-[#e5e5ea] px-2 py-0.5">
+              <span className="text-[10px] tracking-wide text-[#24282f]">Audience questions</span>
+            </div>
+            <h1 className="text-lg font-semibold text-[#2428">
+              {sessionTitle ?? "Session questions"}
+            </h1>
+            {ev?.name ? (
+              <p className="mt-1 text-xs text-[var(--theme-card-text-color)]/80">{ev.name}</p>
+            ) : null}
+          
+            <button
+              type="button"
+              onClick={() => setAskOpen(true)}
+              className="mt-4 flex h-11 w-full items-center justify-between rounded-full bg-[var(--theme-button-color)] px-[18px] text-left shadow-sm transition-colors duration-300 ease-in-out hover:bg-[var(--theme-button-color)]/90"
+            >
+              <span className="text-xs font-semibold uppercase tracking-wide text-white">
+                Ask a question
+              </span>
+              <ChevronRight className="size-4 text-white" strokeWidth={2.5} />
+            </button>
           </div>
-          <h1 className="text-lg font-semibold text-[#24282f]">
-            {sessionTitle ?? "Session questions"}
-          </h1>
-          {ev?.name ? (
-            <p className="mt-1 text-xs text-[rgba(36,40,47,0.65)]">{ev.name}</p>
-          ) : null}
-
-          <button
-            type="button"
-            onClick={() => setAskOpen(true)}
-            className="mt-4 flex h-11 w-full items-center justify-between rounded-full bg-[#ef8d1d] px-[18px] text-left shadow-sm transition hover:bg-[#e0800c]"
-          >
-            <span className="text-xs font-semibold uppercase tracking-wide text-white">
-              Ask a question
-            </span>
-            <ChevronRight className="size-4 text-white" strokeWidth={2.5} />
-          </button>
 
           <div className="mt-6 flex flex-col gap-3">
             {listLoading ? (
@@ -179,8 +182,8 @@ export function Questions() {
           </div>
 
           {sessionHref ? (
-            <p className="mt-6 text-center text-xs">
-              <Link className="text-[#1e72ef] underline" to={sessionHref}>
+            <p className="mt-6 text-center text-md">
+              <Link className="text-[var(--theme-text-color)] underline" to={sessionHref}>
                 Back to session
               </Link>
             </p>
diff --git a/src/pages/QuizPollTakePage.tsx b/src/pages/QuizPollTakePage.tsx
index a945a76..a10b681 100644
--- a/src/pages/QuizPollTakePage.tsx
+++ b/src/pages/QuizPollTakePage.tsx
@@ -731,9 +731,9 @@ export function QuizPollTakePage() {
         <div className="flex shrink-0 flex-col">
           <HeaderMobile logoUrl={headerLogo} eventId={eventId} />
         </div>
-        <main className="min-h-0 flex-1 overflow-y-auto overscroll-contain bg-[#f2f2f7] px-4 pb-8 pt-6">
+        <main className="min-h-0 flex-1 overflow-y-auto overscroll-contain bg-[#f2f2f px-4 pb-8 pt-6">
           <div className="mx-auto w-full max-w-[370px]">
-            <div className="rounded-lg border border-[rgba(116,112,112,0.2)] bg-white p-5 text-center shadow-sm">
+            <div className="rounded-lg border border-[rgba(116,112,112,0.2)] bg-whit card-bg p-5 text-center shadow-sm">
               <p className="font-inter text-lg font-semibold text-[#24282f]">Thank you</p>
               <p className="mt-1 text-sm text-[#24282f]">Your response was submitted.</p>
               {showRes && isQuiz && typeof scoreSubmitted === "number" ? (
@@ -925,7 +925,7 @@ export function QuizPollTakePage() {
 
   const footerBtnClass =
     "rounded-lg px-3 py-1.5 text-center text-xs font-semibold shadow-sm disabled:opacity-50 disabled:hover:bg-inherit";
-  const footerSecondaryClass = `${footerBtnClass} flex-1 border border-[#e5e5ea] bg-white text-[#24282f] hover:bg-[#f2f2f7]`;
+  const footerSecondaryClass = `${footerBtnClass} flex-1 border border-[#e5e5ea] bg-white/40 text-[#24282f] hover:bg-white/40`;
 
   return (
     <MobileShell className="relative h-dvh min-h-0 flex-col">
@@ -934,20 +934,23 @@ export function QuizPollTakePage() {
       </div>
       <main
         ref={mainScrollRef}
-        className="relative z-0 min-h-0 flex-1 overflow-y-auto overscroll-contain bg-[#f2f2f7] px-4 pt-6"
+        className="relative z-0 min-h-0 flex-1 overflow-y-auto overscroll-contain bg-[#f2f2f7 px-4 pt-6"
       >
         <div className="mx-auto w-full max-w-[370px] pb-4">
-          <p className="text-[10px] font-semibold uppercase tracking-wide text-[#1e72ef]">{typeHeading(quiz.type)}</p>
-          <h1 className="mt-1 font-inter text-xl font-semibold text-[#24282f]">{quiz.title}</h1>
-          {isQuizMasterMode && liveQuestion ? (
-            <p className="mt-2 text-xs font-medium tabular-nums text-[rgba(36,40,47,0.55)]">
-              Question {liveQuestionIndex + 1} of {totalQuestions}
-            </p>
-          ) : multiQuestion ? (
-            <p className="mt-2 text-xs font-medium tabular-nums text-[rgba(36,40,47,0.55)]">
-              Question {stepSafe + 1} of {totalQuestions}
-            </p>
-          ) : null}
+          <div className="flex flex-col gap-1 card-bg p-4 rounded-lg border border-[rgba(116,112,112,0.2)] shadow-sm">
+            <p className="text-[10px] font-semibold uppercase tracking-wide text-[var(--theme-button-color)]">{typeHeading(quiz.type)}</p>
+            <h1 className="mt-1 font-inte text-xl font-semibold text-[#24282f]">{quiz.title}</h1>
+            {isQuizMasterMode && liveQuestion ? (
+              <p className="mt-2 text-xs font-medium tabular-nums text-[rgba(36,40,47,0.55)]">
+                Question {liveQuestionIndex + 1} of {totalQuestions}
+              </p>
+            ) : multiQuestion ? (
+              <p className="mt-2 text-xs font-medium tabular-nums text-[rgba(36,40,47,0.55)]">
+                Question {stepSafe + 1} of {totalQuestions}
+              </p>
+            ) : null}
+          </div>
+          
 
           {timerActive && secondsLeft != null ? (
             <div
@@ -977,7 +980,7 @@ export function QuizPollTakePage() {
             ).map((q, offset) => {
               const qi = isQuizMasterMode ? liveQuestionIndex : multiQuestion ? stepSafe : offset;
               return (
-                <li key={q._id} className="rounded-lg border border-[rgba(116,112,112,0.2)] bg-white p-4 shadow-sm">
+                <li key={q._id} className="rounded-lg border border-[rgba(116,112,112,0.2)] bg-whit card-bg p-4 shadow-sm">
                   <p className="text-sm font-semibold text-[#24282f]">
                     <span className="text-[#8e8e93]">{qi + 1}. </span>
                     {q.question}
@@ -991,7 +994,7 @@ export function QuizPollTakePage() {
                           <label
                             key={opt._id}
                             className={`flex cursor-pointer items-start gap-2 rounded-md border px-3 py-2 text-sm ${
-                              selected ? "border-[#1e72ef] bg-[#1e72ef]/5" : "border-[#e5e5ea]"
+                              selected ? "border-[var(--theme-button-color)] bg-[var(--theme-card-color)]/10 text-[var(--theme-button-color)]" : "bg-[var(--theme-card-color)]/30 border-[var(--theme-card-color)]/15 text-[var(--theme-card-text-color)]"
                             }`}
                           >
                             <input
@@ -1039,7 +1042,7 @@ export function QuizPollTakePage() {
                         <label
                           key={opt._id}
                           className={`flex cursor-pointer items-start gap-2 rounded-md border px-3 py-2 text-sm ${
-                            answers[q._id] === opt._id ? "border-[#1e72ef] bg-[#1e72ef]/5" : "border-[#e5e5ea]"
+                            answers[q._id] === opt._id ? "border-[var(--theme-button-color)] bg-[var(--theme-card-color)]/10 text-[var(--theme-button-color)]" : "bg-[var(--theme-card-color)]/30 border-[var(--theme-card-color)]/15 text-[var(--theme-card-text-color)]"
                           }`}
                         >
                           <input
@@ -1087,8 +1090,8 @@ export function QuizPollTakePage() {
 
           {submitError ? <p className="mt-4 text-center text-sm text-red-600">{submitError}</p> : null}
 
-          <p className="mt-6 text-center text-xs">
-            <Link className="text-[#1e72ef] underline" to={sessionBackHref}>
+          <p className="mt-6 text-center text-md">
+            <Link className="text-[var(--theme-text-color)] underline" to={sessionBackHref}>
               Back to session
             </Link>
           </p>
@@ -1096,7 +1099,7 @@ export function QuizPollTakePage() {
       </main>
 
       <footer
-        className="z-40 shrink-0 border-t border-[#e5e5ea] bg-white shadow-[0_-4px_12px_rgba(0,0,0,0.06)]"
+        className="z-40 shrink-0 border-t border-[var(--theme-card-color)]/25 bg-whit card-bg shadow-[0_-4px_12px_rgba(0,0,0,0.06)]"
         style={{ paddingBottom: "max(12px, env(safe-area-inset-bottom))", paddingTop: 12, paddingLeft: 16, paddingRight: 16 }}
       >
         <div className="mx-auto flex w-full max-w-[370px] gap-2">
@@ -1115,7 +1118,7 @@ export function QuizPollTakePage() {
                   type="button"
                   disabled={submitting}
                   onClick={() => void runSubmit()}
-                  className={`${footerBtnClass} flex-1 bg-orange-500 text-white hover:bg-orange-600 disabled:hover:bg-orange-500`}
+                  className={`${footerBtnClass} flex-1 theme-btn-bg text-white  disabled:hover:bg-[var(--theme-button-color)]/50`}
                 >
                   {submitLabel}
                 </button>
@@ -1123,7 +1126,7 @@ export function QuizPollTakePage() {
                 <button
                   type="button"
                   onClick={() => setQuestionStep((s) => Math.min(totalQuestions - 1, s + 1))}
-                  className={`${footerBtnClass} flex-1 bg-orange-500 text-white hover:bg-orange-600`}
+                  className={`${footerBtnClass} flex-1 theme-btn-bg text-white disabled:hover:bg-[var(--theme-button-color)]/50`}
                 >
                   Next
                 </button>
@@ -1134,7 +1137,7 @@ export function QuizPollTakePage() {
               type="button"
               disabled={submitting}
               onClick={() => void runSubmit()}
-              className="w-full rounded-lg bg-orange-500 px-3 py-1.5 text-center text-xs font-semibold text-white shadow-sm hover:bg-orange-600 disabled:opacity-60 disabled:hover:bg-orange-500"
+              className="w-full rounded-lg theme-btn-bg px-3 py-1.5 text-center text-xs font-semibold text-white shadow-sm disabled:opacity-60 disabled:hover:bg-[var(--theme-button-color)]/50"
             >
               {submitLabel}
             </button>
diff --git a/src/pages/RatingsPage.tsx b/src/pages/RatingsPage.tsx
index e3f5f10..78af243 100644
--- a/src/pages/RatingsPage.tsx
+++ b/src/pages/RatingsPage.tsx
@@ -124,9 +124,9 @@ export function RatingsPage() {
   return (
     <MobileShell className="relative">
       <HeaderMobile logoUrl={eventSnapshot?.logoUrl} eventId={eventId || null} />
-      <main className="flex flex-1 flex-col bg-[#f2f2f7] px-4 pb-10 pt-6">
+      <main className="flex flex-1 flex-col bg-[#f2f2f7 bg-transparent px-4 pb-10 pt-6">
         <div className="mx-auto w-full max-w-[370px]">
-          <h1 className="font-inter text-xl font-semibold text-[#24282f]">{schema?.name || "Ratings"}</h1>
+          <h1 className="font-inter text-xl font-semibold text-[var(--theme-text-color)]">{schema?.name || "Ratings"}</h1>
           {schemaLoading ? (
             <p className="mt-4 text-sm text-[rgba(36,40,47,0.67)]">Loading form…</p>
           ) : schemaErr ? (
diff --git a/src/pages/RewardsPage.tsx b/src/pages/RewardsPage.tsx
index 311ceda..01a0237 100644
--- a/src/pages/RewardsPage.tsx
+++ b/src/pages/RewardsPage.tsx
@@ -71,14 +71,16 @@ export function RewardsPage() {
     <MobileShell className="relative">
       <HeaderMobile logoUrl={ctx?.event?.logoUrl} eventId={eventId || null} />
       <div className="eb-gradient-auth flex flex-1 flex-col items-center px-6 pb-10 pt-6">
-        <Trophy className="size-[68px] text-amber-300" strokeWidth={1.25} />
-        <h1 className="mt-1 font-inter text-xl font-semibold text-white">Your Rewards</h1>
-        <Link
-          to={eventId ? `/leaderboard?event_id=${encodeURIComponent(eventId)}` : "/leaderboard"}
-          className="mt-6 w-full max-w-[354px] rounded-full border border-[rgba(214,200,200,0.6)] bg-[#ef8d1d] py-3 text-center text-xs font-semibold uppercase tracking-wide text-white shadow-[0_4px_4px_rgba(0,0,0,0.15)]"
-        >
-          Leaderboard
-        </Link>
+        <div className="flex flex-col w-full max-w-[354px] items-center card-bg p-4 rounded-md">
+          <Trophy className="size-[68px] text-amber-300" strokeWidth={1.25} />
+          <h1 className="mt-1 font-inter text-xl font-semibold text-white">Your Rewards</h1>
+          <Link
+            to={eventId ? `/leaderboard?event_id=${encodeURIComponent(eventId)}` : "/leaderboard"}
+            className="mt-6 w-full max-w-[354px] rounded-full border border-[rgba(214,200,200,0.6)] bg-[var(--theme-button-color)] transition-colors duration-300 ease-in-out hover:bg-[var(--theme-button-color)]/90 py-3 text-center text-xs font-semibold uppercase tracking-wide text-white shadow-[0_4px_4px_rgba(0,0,0,0.15)]"
+          >
+            Leaderboard
+          </Link>
+        </div>
 
         <div className="mt-6 w-full max-w-[354px] rounded-xl bg-white shadow-[0_8px_12px_6px_rgba(0,0,0,0.15),0_4px_4px_rgba(0,0,0,0.3)]">
           <div className="p-4">
diff --git a/src/pages/SingleEventPage.tsx b/src/pages/SingleEventPage.tsx
index 1c96537..e55cf31 100644
--- a/src/pages/SingleEventPage.tsx
+++ b/src/pages/SingleEventPage.tsx
@@ -470,7 +470,7 @@ export function SingleEventPage() {
     Boolean(sessionNotes || sessionLocation || trackHall || hasCapacity);
 
   return (
-    <MobileShell className="relative">
+    <MobileShell className="relative bg-transparent">
       <HeaderMobile
         logoUrl={headerLogoUrl}
         eventName={headerEventName}
@@ -488,7 +488,7 @@ export function SingleEventPage() {
         </div>
       ) : null}
 
-      <div className="eb-gradient-banner relative flex flex-col items-center justify-center gap-1.5 px-6 pb-4 pt-3 text-center text-white">
+      <div className="eb-gradient-banne card-bg relative flex flex-col items-cente justify-center rounded-b-lg gap-1.5 px-6 pb-4 pt-3 text-cente text-whit text-[var(--theme-card-text-color)]">
         <div className="absolute right-3 top-2.5 z-10 flex max-w-[calc(100%-4.5rem)] flex-col items-end gap-1.5">
           {live ? (
             <span className="inline-flex shrink-0 items-center gap-1 rounded-full bg-[#14ae5c] px-2 py-0.5 text-[10px] font-semibold text-white">
@@ -499,20 +499,20 @@ export function SingleEventPage() {
           <button
             type="button"
             onClick={() => toggleBookmark(sessionId)}
-            className="shrink-0 rounded-md p-1 text-white hover:bg-white/15"
+            className="shrink-0 rounded-md p-1 text-[var(--theme-button-color)] hover:bg-white/15"
             aria-label={sessionBookmarked ? "Remove bookmark" : "Bookmark session"}
             aria-pressed={sessionBookmarked}
           >
             <Bookmark className={`size-6 ${sessionBookmarked ? "fill-current" : ""}`} strokeWidth={1.75} />
           </button>
         </div>
-        <div className="flex max-w-full flex-wrap items-center justify-center gap-x-2 gap-y-1 px-2 text-[10px] text-white/90">
-          <span className="rounded bg-white/20 px-2 py-0.5">{typeLabel}</span>
+        <div className="flex max-w-full flex-wrap items-center justify-cente gap-x-2 gap-y-1 pe-2 text-[10px]">
+          <span className="rounded bg-[var(--theme-button-color)]/20 px-2 py-0.5">{typeLabel}</span>
           {timeLine ? <span>{timeLine}</span> : null}
           {trackTitle !== typeLabel ? <span className="opacity-90">{trackTitle}</span> : null}
         </div>
         <h1 className="font-inter text-2xl font-bold tracking-tight">{session.title}</h1>
-        <div className="flex w-full max-w-full flex-wrap items-center justify-end gap-x-3 gap-y-1 pr-1 text-sm text-white/95">
+        <div className="flex w-full max-w-full flex-wrap items-center justify-end gap-x-3 gap-y-1 pr-1 text-sm text-[var(--theme-card-text-color)]/70">
           {duration ? (
             <span className="flex items-center gap-1.5">
               <Clock className="size-4 shrink-0" strokeWidth={1.75} />
@@ -538,7 +538,7 @@ export function SingleEventPage() {
               aria-label={
                 sessionMetaOpen ? "Hide session notes and location" : "Show session notes and location"
               }
-              className="inline-flex shrink-0 items-center rounded-md p-0.5 text-white hover:bg-white/15"
+              className="inline-flex shrink-0 items-center rounded-md p-0.5 text-[var(--theme-card-text-color)] hover:bg-[var(--theme-button-color)]/15"
             >
               <ChevronDown
                 className={`size-5 transition-transform ${sessionMetaOpen ? "rotate-180" : ""}`}
@@ -550,20 +550,20 @@ export function SingleEventPage() {
         </div>
 
         {sessionMetaOpen && hasExpandableSessionMeta ? (
-          <div className="mt-2 w-full max-w-full border-t border-white/25 px-1 pt-3 text-left text-sm text-white/95">
+          <div className="mt-2 w-full max-w-full border-t border-[var(--theme-card-color)]/35 px-1 pt-3 text-left text-sm text-[var(--theme-card-text-color)]/95">
             {sessionNotes ? (
               <div className="mb-3">
-                <p className="text-[10px] font-semibold uppercase tracking-wide text-white/70">Notes</p>
+                <p className="text-[10px] font-semibold uppercase tracking-wide text-[var(--theme-card-text-color)]/80">Notes</p>
                 <p className="mt-1.5 whitespace-pre-wrap leading-snug">{sessionNotes}</p>
               </div>
             ) : null}
             {sessionLocation || trackHall ? (
               <div>
-                <p className="text-[10px] font-semibold uppercase tracking-wide text-white/70">Location</p>
+                <p className="text-[10px] font-semibold uppercase tracking-wide text-[var(--theme-card-text-color)]/80">Location</p>
                 <ul className="mt-1.5 flex flex-col gap-1.5">
                   {sessionLocation ? (
                     <li className="flex items-start gap-2 leading-snug">
-                      <MapPin className="mt-0.5 size-4 shrink-0 text-white/90" strokeWidth={1.75} />
+                      <MapPin className="mt-0.5 size-4 shrink-0 text-[var(--theme-button-color)]" strokeWidth={1.75} />
                       <span>{sessionLocation}</span>
                     </li>
                   ) : null}
@@ -583,7 +583,7 @@ export function SingleEventPage() {
         ) : null}
       </div>
 
-      <main className="relative z-0 w-full max-w-none flex-1 bg-[#f2f2f7] pb-28 pt-4">
+      <main className="test-class relative z-0 w-full max-w-none flex-1 bg-transparent px-4 pb-28 pt-4">
         <div className="flex w-full max-w-none flex-col gap-4">
           {session && session.enableQnA !== false ? (
             <SessionQuestionsCard
@@ -605,7 +605,7 @@ export function SingleEventPage() {
                 {showSessionFeedback ? (
                   <Link
                     to={sessionFeedbackHref}
-                    className="flex items-center justify-between gap-3 rounded-lg border border-[rgba(116,112,112,0.2)] bg-white px-3 py-3 text-sm font-medium text-[#24282f] shadow-[0_1px_4px_rgba(12,12,13,0.05)] active:bg-[#f2f2f7]"
+                    className="flex items-center justify-between gap-3 rounded-lg border border-[rgba(116,112,112,0.2)] bg-whit card-bg px-3 py-3 text-sm font-medium text-[#24282f] shadow-[0_1px_4px_rgba(12,12,13,0.05)] active:bg-[#f2f2f7]"
                   >
                     <span className="flex min-w-0 items-center gap-2.5">
                       <MessageCircle className="size-[18px] shrink-0 text-[#1e72ef]" strokeWidth={1.75} />
@@ -617,7 +617,7 @@ export function SingleEventPage() {
                 {showSessionRatings ? (
                   <Link
                     to={sessionRatingsHref}
-                    className="flex items-center justify-between gap-3 rounded-lg border border-[rgba(116,112,112,0.2)] bg-white px-3 py-3 text-sm font-medium text-[#24282f] shadow-[0_1px_4px_rgba(12,12,13,0.05)] active:bg-[#f2f2f7]"
+                    className="flex items-center justify-between gap-3 rounded-lg border border-[rgba(116,112,112,0.2)] bg-whit card-bg px-3 py-3 text-sm font-medium text-[#24282f] shadow-[0_1px_4px_rgba(12,12,13,0.05)] active:bg-[#f2f2f7]"
                   >
                     <span className="flex min-w-0 items-center gap-2.5">
                       <Star className="size-[18px] shrink-0 text-[#1e72ef]" strokeWidth={1.75} />
diff --git a/src/theme/eventTheme.ts b/src/theme/eventTheme.ts
new file mode 100644
index 0000000..62c658a
--- /dev/null
+++ b/src/theme/eventTheme.ts
@@ -0,0 +1,229 @@
+import type { EventThemeConfig } from "../types/visitorContext";
+
+const DEFAULT_THEME_FONT = "Open Sans";
+
+type FontFaceSpec = { href: string; heading: string; body: string };
+
+/** Single-family fonts for theme.font (heading + body share the same family). */
+export const THEME_FONT_SPECS: Record<string, FontFaceSpec> = {
+  "Open Sans": {
+    href: "https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;600;700;800&display=swap",
+    heading: '"Open Sans", system-ui, sans-serif',
+    body: '"Open Sans", system-ui, sans-serif',
+  },
+  Montserrat: {
+    href: "https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;600;700;800&display=swap",
+    heading: '"Montserrat", system-ui, sans-serif',
+    body: '"Montserrat", system-ui, sans-serif',
+  },
+  Roboto: {
+    href: "https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap",
+    heading: '"Roboto", system-ui, sans-serif',
+    body: '"Roboto", system-ui, sans-serif',
+  },
+  Poppins: {
+    href: "https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;700;800&display=swap",
+    heading: '"Poppins", system-ui, sans-serif',
+    body: '"Poppins", system-ui, sans-serif',
+  },
+  Raleway: {
+    href: "https://fonts.googleapis.com/css2?family=Raleway:wght@300;400;600;700;800&display=swap",
+    heading: '"Raleway", system-ui, sans-serif',
+    body: '"Raleway", system-ui, sans-serif',
+  },
+};
+
+const THEME_FONT_ALIASES: Record<string, string> = Object.fromEntries(
+  Object.keys(THEME_FONT_SPECS).map((name) => [name.toLowerCase(), name]),
+);
+
+const THEME_VAR_KEYS = [
+  "--theme-heading-font",
+  "--theme-body-font",
+  "--theme-primary-color",
+  "--theme-secondary-color",
+  "--theme-header-color",
+  "--theme-button-color",
+  "--theme-text-color",
+  "--theme-text-highlight-color",
+  "--theme-card-color",
+  "--theme-card-text-color",
+  "--theme-bg-color",
+  "--theme-bg-image",
+  "--theme-bg-size",
+  "--theme-bg-repeat",
+  "--theme-bg-position",
+] as const;
+
+function normalizeHex(input?: string | null): string | null {
+  if (input == null) return null;
+  let s = String(input).trim();
+  if (!s) return null;
+  if (!s.startsWith("#")) s = `#${s}`;
+  if (/^#([0-9a-fA-F]{3})$/.test(s)) {
+    const x = s.slice(1);
+    s = `#${x[0]}${x[0]}${x[1]}${x[1]}${x[2]}${x[2]}`;
+  }
+  if (!/^#([0-9a-fA-F]{6})$/.test(s)) return null;
+  return s;
+}
+
+/** Accepts hex / rgb() / rgba() / named colors as CSS color strings. */
+function normalizeCssColor(input?: string | null): string | null {
+  if (input == null) return null;
+  const s = String(input).trim();
+  if (!s) return null;
+  const hex = normalizeHex(s);
+  if (hex) return hex;
+  if (/^(rgb|rgba|hsl|hsla)\(/i.test(s) || /^[a-z]+$/i.test(s)) return s;
+  return s;
+}
+
+function normalizeBgRepeat(repeat?: string | null): string {
+  const raw = String(repeat ?? "").trim().toLowerCase();
+  if (!raw || raw === "no" || raw === "no-repeat" || raw === "false") return "no-repeat";
+  if (raw === "yes" || raw === "true" || raw === "repeat") return "repeat";
+  if (raw === "repeat-x" || raw === "repeat-y" || raw === "space" || raw === "round") return raw;
+  return "no-repeat";
+}
+
+/**
+ * Resolves theme.font → font face. Defaults to Open Sans.
+ * Unknown values fall back to Open Sans.
+ */
+export function resolveThemeFont(config?: EventThemeConfig | null): FontFaceSpec {
+  const raw = config?.font != null ? String(config.font).trim() : "";
+  const key = raw ? THEME_FONT_ALIASES[raw.toLowerCase()] : DEFAULT_THEME_FONT;
+  return THEME_FONT_SPECS[key] || THEME_FONT_SPECS[DEFAULT_THEME_FONT];
+}
+
+function themeBackgroundVars(theme?: EventThemeConfig | null): Record<string, string> {
+  if (!theme) return {};
+  const mode = String(theme.theme || "").trim().toLowerCase();
+  const vars: Record<string, string> = {
+    "--theme-bg-color": "transparent",
+    "--theme-bg-image": "none",
+    "--theme-bg-size": "auto",
+    "--theme-bg-repeat": "no-repeat",
+    "--theme-bg-position": "center center",
+  };
+
+  if (mode === "background") {
+    const url = theme.background?.url != null ? String(theme.background.url).trim() : "";
+    if (url) {
+      vars["--theme-bg-image"] = `url("${url.replace(/"/g, '\\"')}")`;
+      vars["--theme-bg-size"] = String(theme.background?.size || "cover").trim() || "cover";
+      vars["--theme-bg-repeat"] = normalizeBgRepeat(theme.background?.repeat);
+      vars["--theme-bg-position"] = "center center";
+    }
+    return vars;
+  }
+
+  if (mode === "gradient") {
+    const c1 =
+      normalizeCssColor(theme.gradient?.color1) ||
+      normalizeCssColor(theme.primaryColor) ||
+      "#1e79f0";
+    const c2 =
+      normalizeCssColor(theme.gradient?.color2) ||
+      normalizeCssColor(theme.secondaryColor) ||
+      "#bd35e6";
+    vars["--theme-bg-image"] = `linear-gradient(135deg, ${c1} 0%, ${c2} 100%)`;
+    vars["--theme-bg-size"] = "cover";
+    vars["--theme-bg-repeat"] = "no-repeat";
+    return vars;
+  }
+
+  if (mode === "simple") {
+    const color =
+      normalizeCssColor(theme.color) ||
+      normalizeCssColor(theme.primaryColor) ||
+      "#1e79f0";
+    vars["--theme-bg-color"] = color;
+    vars["--theme-bg-image"] = "none";
+    return vars;
+  }
+
+  return vars;
+}
+
+function themePaletteVars(theme?: EventThemeConfig | null): Record<string, string> {
+  if (!theme) return {};
+  const vars: Record<string, string> = {};
+  const primary = normalizeCssColor(theme.primaryColor);
+  const secondary = normalizeCssColor(theme.secondaryColor);
+  const header = normalizeCssColor(theme.headerColor);
+  const button = normalizeCssColor(theme.buttonColor);
+  const text = normalizeCssColor(theme.textColor);
+  const textHighlight = normalizeCssColor(theme.textHighlightColor);
+  const card = normalizeCssColor(theme.cardColor);
+  const cardText = normalizeCssColor(theme.cardTextColor);
+
+  if (primary) vars["--theme-primary-color"] = primary;
+  if (secondary) vars["--theme-secondary-color"] = secondary;
+  if (header) vars["--theme-header-color"] = header;
+  if (button) vars["--theme-button-color"] = button;
+  if (text) vars["--theme-text-color"] = text;
+  if (textHighlight) vars["--theme-text-highlight-color"] = textHighlight;
+  if (card) vars["--theme-card-color"] = card;
+  if (cardText) vars["--theme-card-text-color"] = cardText;
+
+  return vars;
+}
+
+/** Build CSS custom properties for an event theme (fonts + palette + page background). */
+export function eventThemeCssVars(theme?: EventThemeConfig | null): Record<string, string> {
+  const spec = resolveThemeFont(theme);
+  return {
+    "--theme-heading-font": spec.heading,
+    "--theme-body-font": spec.body,
+    ...themePaletteVars(theme),
+    ...themeBackgroundVars(theme),
+  };
+}
+
+export function loadEventThemeFont(theme?: EventThemeConfig | null): void {
+  if (typeof document === "undefined") return;
+  const spec = resolveThemeFont(theme);
+  const id = "eb-event-theme-fonts";
+  let link = document.getElementById(id) as HTMLLinkElement | null;
+  if (!link) {
+    link = document.createElement("link");
+    link.id = id;
+    link.rel = "stylesheet";
+    document.head.appendChild(link);
+  }
+  if (link.href !== spec.href) {
+    link.href = spec.href;
+  }
+}
+
+function applyCssVars(el: HTMLElement, vars: Record<string, string>) {
+  for (const [key, value] of Object.entries(vars)) {
+    el.style.setProperty(key, value);
+  }
+}
+
+function clearCssVars(el: HTMLElement, keys: readonly string[]) {
+  for (const key of keys) {
+    el.style.removeProperty(key);
+  }
+}
+
+/** Apply theme CSS variables + font to `<html>`. Pass null/undefined to clear. */
+export function applyEventTheme(theme?: EventThemeConfig | null): void {
+  if (typeof document === "undefined") return;
+  const html = document.documentElement;
+  clearCssVars(html, THEME_VAR_KEYS);
+  if (!theme) return;
+  loadEventThemeFont(theme);
+  applyCssVars(html, eventThemeCssVars(theme));
+  html.dataset.ebTheme = String(theme.theme || "").trim().toLowerCase() || "";
+}
+
+export function clearEventTheme(): void {
+  if (typeof document === "undefined") return;
+  const html = document.documentElement;
+  clearCssVars(html, THEME_VAR_KEYS);
+  delete html.dataset.ebTheme;
+}
diff --git a/src/types/visitorContext.ts b/src/types/visitorContext.ts
index 46bc23f..70bb3e0 100644
--- a/src/types/visitorContext.ts
+++ b/src/types/visitorContext.ts
@@ -15,6 +15,42 @@ export interface ResolveCodeResponse {
   trackId?: string;
 }
 
+/** Page background preset from login-preview `theme`. */
+export type EventThemeMode = "simple" | "gradient" | "background" | "pattern" | string;
+
+/** Single-family fonts driven by theme.font (same set as Eventbuzz_Web). */
+export type EventThemeFont = "Open Sans" | "Montserrat" | "Roboto" | "Poppins" | "Raleway";
+
+export type EventThemeBackground = {
+  url?: string | null;
+  size?: string | null;
+  /** `"no"` / `"no-repeat"` → no-repeat; `"yes"` / `"repeat"` → repeat */
+  repeat?: string | null;
+};
+
+export type EventThemeGradient = {
+  color1?: string | null;
+  color2?: string | null;
+};
+
+/** Dynamic styling config from GET login-preview → CSS vars on `<html>`. */
+export interface EventThemeConfig {
+  theme: EventThemeMode;
+  color?: string | null;
+  pattern?: string | null;
+  background?: EventThemeBackground | null;
+  gradient?: EventThemeGradient | null;
+  font?: EventThemeFont | string | null;
+  primaryColor?: string | null;
+  secondaryColor?: string | null;
+  headerColor?: string | null;
+  buttonColor?: string | null;
+  textColor?: string | null;
+  textHighlightColor?: string | null;
+  cardColor?: string | null;
+  cardTextColor?: string | null;
+}
+
 /** Visitor login-preview: full event (no website / createdAt / updatedAt) + computed logoUrl. */
 export interface LoginPreviewResponse {
   _id: string;
@@ -52,6 +88,8 @@ export interface LoginPreviewResponse {
   logoUrl: string;
   /** Star ratings for this event only (from feedback/survey submissions). */
   ratings?: { average: number; count: number };
+  /** Dynamic page theme → CSS variables on `<html>`. */
+  theme?: EventThemeConfig | null;
 }
 
 export interface EbVisitorContext {
@@ -98,6 +136,7 @@ export type VisitorJoinContext = {
  * After login / profile completion: `/event|session|track?event_id=&session_id=&track_id=`
  */
 export function buildPostAuthUrl(ctx: VisitorJoinContext | EbVisitorContext | null): string {
+  console.log("buildPostAuthUrl", ctx);
   if (!ctx) return "/event";
   const params = new URLSearchParams();
   params.set("event_id", ctx.eventId);