diff --git a/src/app/(marketing)/products/product-detail-content-v3.tsx b/src/app/(marketing)/products/product-detail-content-v3.tsx
index d6cf67c..995a947 100644
--- a/src/app/(marketing)/products/product-detail-content-v3.tsx
+++ b/src/app/(marketing)/products/product-detail-content-v3.tsx
@@ -26,7 +26,7 @@ function DetailHero({ product }: DetailHeroProps) {
   const productIcon = PRODUCT_ICONS[product.title] || <Package className="w-8 h-8" />;
 
   return (
-    <section className="relative min-h-[80vh] flex items-center overflow-hidden bg-white pt-24">
+    <section className="relative min-h-[80vh] flex items-center overflow-hidden bg-bg-primary pt-24">
       <div className="max-w-container mx-auto px-4 sm:px-6 lg:px-10 relative z-10 w-full py-20 sm:py-24 md:py-28 lg:py-32">
         <motion.div
           initial={{ opacity: 0, y: 30 }}
@@ -135,7 +135,7 @@ function FeaturesSection({ features }: FeaturesSectionProps) {
           {features.map((feature, idx) => (
             <div
               key={idx}
-              className="group relative p-8 bg-white hover:bg-bg-secondary transition-all duration-500"
+              className="group relative p-8 bg-bg-primary hover:bg-bg-secondary transition-all duration-500"
             >
               <div className="flex items-center gap-5">
                 <div className="w-10 h-10 rounded-xl bg-brand-soft flex items-center justify-center text-brand shrink-0">
@@ -157,7 +157,7 @@ interface BenefitsSectionProps {
 
 function BenefitsSection({ benefits }: BenefitsSectionProps) {
   return (
-    <section className="relative py-20 sm:py-28 md:py-32 lg:py-40 overflow-hidden bg-white">
+    <section className="relative py-20 sm:py-28 md:py-32 lg:py-40 overflow-hidden bg-bg-primary">
       <div className="absolute top-0 left-0 right-0 h-px bg-border-primary" />
       <div className="absolute bottom-0 left-0 right-0 h-px bg-border-primary" />
 
@@ -178,7 +178,7 @@ function BenefitsSection({ benefits }: BenefitsSectionProps) {
               {benefits.map((benefit, idx) => (
                 <div
                   key={idx}
-                  className="group relative p-8 bg-white hover:bg-bg-secondary transition-all duration-500"
+                  className="group relative p-8 bg-bg-primary hover:bg-bg-secondary transition-all duration-500"
                 >
                   <div className="flex items-center gap-6">
                     <div className="w-12 h-12 rounded-2xl bg-brand-soft/50 flex items-center justify-center text-brand shrink-0">
@@ -231,7 +231,7 @@ function ProcessSection({ process }: ProcessSectionProps) {
               {process.map((step, idx) => (
                 <div
                   key={idx}
-                  className="group relative text-center p-8 bg-white hover:bg-bg-secondary transition-all duration-500"
+                  className="group relative text-center p-8 bg-bg-primary hover:bg-bg-secondary transition-all duration-500"
                 >
                   <div className="relative z-10 w-20 h-20 rounded-3xl bg-bg-secondary border border-border-primary group-hover:border-brand/50 flex items-center justify-center mx-auto mb-8 transition-all duration-500">
                     <span className="text-3xl font-bold text-brand">{idx + 1}</span>
@@ -256,7 +256,7 @@ function CaseStudiesSection({ caseStudies }: CaseStudiesSectionProps) {
   if (!caseStudies || caseStudies.length === 0) return null;
 
   return (
-    <section className="relative py-20 sm:py-28 md:py-32 lg:py-40 overflow-hidden bg-white">
+    <section className="relative py-20 sm:py-28 md:py-32 lg:py-40 overflow-hidden bg-bg-primary">
       <div className="absolute top-0 left-0 right-0 h-px bg-border-primary" />
       <div className="absolute bottom-0 left-0 right-0 h-px bg-border-primary" />
 
@@ -281,7 +281,7 @@ function CaseStudiesSection({ caseStudies }: CaseStudiesSectionProps) {
             {caseStudies.map((study) => (
               <div
                 key={study.client}
-                className="group relative block overflow-hidden bg-white transition-all duration-500 hover:bg-bg-secondary"
+                className="group relative block overflow-hidden bg-bg-primary transition-all duration-500 hover:bg-bg-secondary"
               >
                 <div className="aspect-[4/3] bg-gradient-to-br from-bg-secondary to-bg-tertiary relative overflow-hidden">
                   <div className="absolute inset-0 flex items-center justify-center">
@@ -350,7 +350,7 @@ function CertificationsSection({ certifications }: CertificationsSectionProps) {
             {certifications.map((cert, idx) => (
               <div
                 key={idx}
-                className="group flex items-center gap-4 px-8 py-5 bg-white hover:bg-bg-secondary transition-all duration-500"
+                className="group flex items-center gap-4 px-8 py-5 bg-bg-primary hover:bg-bg-secondary transition-all duration-500"
               >
                 <div className="w-12 h-12 rounded-xl bg-brand-soft flex items-center justify-center text-brand">
                   <Shield className="w-6 h-6" />
@@ -374,7 +374,7 @@ interface CTASectionProps {
 
 function CTASection({ product }: CTASectionProps) {
   return (
-    <section className="relative py-36 lg:py-44 overflow-hidden bg-white">
+    <section className="relative py-36 lg:py-44 overflow-hidden bg-bg-primary">
       <div className="absolute top-0 left-0 right-0 h-px bg-border-primary" />
       <div className="absolute bottom-0 left-0 right-0 h-px bg-border-primary" />
 
diff --git a/src/app/(marketing)/products/standalone/[id]/client.tsx b/src/app/(marketing)/products/standalone/[id]/client.tsx
index 83789ce..034c276 100644
--- a/src/app/(marketing)/products/standalone/[id]/client.tsx
+++ b/src/app/(marketing)/products/standalone/[id]/client.tsx
@@ -68,7 +68,7 @@ export function StandaloneProductClient({ item }: StandaloneProductClientProps)
       />
 
       {status === 'coming-soon' ? (
-        <section className="bg-white py-16 lg:py-20">
+        <section className="bg-bg-primary py-16 lg:py-20">
           <div className="container-wide">
             <motion.div
               initial={{ opacity: 0, y: 20 }}
@@ -99,7 +99,7 @@ export function StandaloneProductClient({ item }: StandaloneProductClientProps)
                       transition={{ duration: 0.3, delay: index * 0.08 }}
                       className="rounded-lg border border-border-primary bg-bg-secondary p-4"
                     >
-                      <div className="mb-2 flex h-8 w-8 items-center justify-center rounded-lg bg-white text-text-muted">
+                      <div className="mb-2 flex h-8 w-8 items-center justify-center rounded-lg bg-bg-primary text-text-muted">
                         <Icon className="h-4 w-4" />
                       </div>
                       <h3 className="mb-1 text-sm font-semibold text-ink">
@@ -129,7 +129,7 @@ export function StandaloneProductClient({ item }: StandaloneProductClientProps)
         </section>
       ) : (
         <>
-          <section className="bg-white py-16 lg:py-20">
+          <section className="bg-bg-primary py-16 lg:py-20">
             <div className="container-wide">
               <div className="grid grid-cols-1 gap-12 lg:grid-cols-2">
                 <motion.div
@@ -192,7 +192,7 @@ export function StandaloneProductClient({ item }: StandaloneProductClientProps)
                       whileInView={{ opacity: 1, y: 0 }}
                       viewport={{ once: true }}
                       transition={{ duration: 0.3, delay: index * 0.05 }}
-                      className="rounded-lg border border-border-primary bg-white p-5"
+                      className="rounded-lg border border-border-primary bg-bg-primary p-5"
                     >
                       <div className="mb-2 text-sm text-text-muted">{param.name}</div>
                       <div className="mb-2 text-2xl font-bold text-brand">{param.value}</div>
@@ -207,7 +207,7 @@ export function StandaloneProductClient({ item }: StandaloneProductClientProps)
           )}
 
           {complianceCertifications.length > 0 && (
-            <section className="bg-white py-16 lg:py-20">
+            <section className="bg-bg-primary py-16 lg:py-20">
               <div className="container-wide">
                 <motion.div
                   initial={{ opacity: 0, y: 20 }}
@@ -238,7 +238,7 @@ export function StandaloneProductClient({ item }: StandaloneProductClientProps)
                       className="flex flex-col sm:flex-row sm:items-center justify-between gap-4 rounded-lg border border-border-primary bg-bg-secondary p-5"
                     >
                       <div className="flex items-start gap-4">
-                        <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-lg bg-white text-brand">
+                        <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-lg bg-bg-primary text-brand">
                           <FileCheck className="h-5 w-5" />
                         </div>
                         <div>
diff --git a/src/components/detail/detail-hero.tsx b/src/components/detail/detail-hero.tsx
index 2a3eb6e..7491276 100644
--- a/src/components/detail/detail-hero.tsx
+++ b/src/components/detail/detail-hero.tsx
@@ -32,7 +32,7 @@ export function DetailHero({
 
   const bgClass = isBrand
     ? 'bg-brand-section text-white'
-    : 'bg-white text-ink';
+    : 'bg-bg-primary text-ink';
 
   return (
     <section className={`relative min-h-[700px] flex items-center overflow-hidden ${bgClass}`}>
diff --git a/src/components/detail/detail.test.tsx b/src/components/detail/detail.test.tsx
index 8aedbfa..4e771fa 100644
--- a/src/components/detail/detail.test.tsx
+++ b/src/components/detail/detail.test.tsx
@@ -383,6 +383,21 @@ describe('DetailHero', () => {
     const section = container.querySelector('section');
     expect(section).toBeInTheDocument();
   });
+
+  it('should use theme-aware bg token (not hard-coded bg-white) for light variant', async () => {
+    const { DetailHero } = await import('./detail-hero');
+    const { container } = render(
+      <DetailHero
+        theme={mockHeroTheme}
+        title="ERP"
+        subtitle="Expert"
+      />
+    );
+    // 暗黑模式：浅色底色必须走 CSS 变量 token，dark 下才能随主题反色
+    const section = container.querySelector('section');
+    expect(section?.className).toContain('bg-bg-primary');
+    expect(section?.className).not.toContain('bg-white');
+  });
 });
 
 describe('ProductValueSection', () => {