diff --git a/src/app/_components/core/fixed-bottom-area.module.css b/src/app/_components/core/fixed-bottom-area.module.css
new file mode 100644
index 00000000..ab96a60d
--- /dev/null
+++ b/src/app/_components/core/fixed-bottom-area.module.css
@@ -0,0 +1,19 @@
+.area {
+  position: sticky;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  z-index: var(--fixed-bottom-z-index, 5);
+  flex: 0 0 auto;
+  padding:
+    var(--fixed-bottom-padding-top, 12px)
+    calc(var(--page-padding-x, 20px) + var(--app-safe-right, 0px))
+    calc(var(--fixed-bottom-padding-bottom, 12px) + var(--app-safe-bottom, 0px))
+    calc(var(--page-padding-x, 20px) + var(--app-safe-left, 0px));
+  background: var(--fixed-bottom-background, transparent);
+}
+
+.area[data-elevated="true"] {
+  box-shadow: 0 -14px 32px rgba(31, 21, 25, 0.08);
+  backdrop-filter: blur(18px);
+}
diff --git a/src/app/_components/core/fixed-bottom-area.tsx b/src/app/_components/core/fixed-bottom-area.tsx
new file mode 100644
index 00000000..ce023655
--- /dev/null
+++ b/src/app/_components/core/fixed-bottom-area.tsx
@@ -0,0 +1,33 @@
+import type { CSSProperties, ReactNode } from "react";
+
+import styles from "./fixed-bottom-area.module.css";
+
+export interface FixedBottomAreaProps {
+  children: ReactNode;
+  className?: string;
+  background?: string;
+  elevated?: boolean;
+}
+
+export function FixedBottomArea({
+  children,
+  className,
+  background,
+  elevated = false,
+}: FixedBottomAreaProps) {
+  const style = background
+    ? ({
+        "--fixed-bottom-background": background,
+      } as CSSProperties)
+    : undefined;
+
+  return (
+    <div
+      className={[styles.area, className].filter(Boolean).join(" ")}
+      data-elevated={elevated}
+      style={style}
+    >
+      {children}
+    </div>
+  );
+}
diff --git a/src/app/_components/core/index.ts b/src/app/_components/core/index.ts
index edcd15ad..2558c34c 100644
--- a/src/app/_components/core/index.ts
+++ b/src/app/_components/core/index.ts
@@ -5,6 +5,10 @@
 export * from "./bottom-sheet";
 export * from "./checkbox";
 export * from "./dialog";
+export * from "./fixed-bottom-area";
 export * from "./loading-indicator";
 export * from "./mobile-shell";
+export * from "./page-scaffold";
+export * from "./responsive-mobile-shell";
+export * from "./scrollable-page";
 export * from "./settings-section";
diff --git a/src/app/_components/core/mobile-shell.tsx b/src/app/_components/core/mobile-shell.tsx
index 52939c86..ecd29534 100644
--- a/src/app/_components/core/mobile-shell.tsx
+++ b/src/app/_components/core/mobile-shell.tsx
@@ -1,16 +1,6 @@
-/**
- * 500px 移动端 Shell（Server Component）
- *
- * 
- * （`Breakpoints.mobileMaxWidth = 500.0`）。
- *
- * 集中封装，调用方仅需 `<MobileShell>{...}</MobileShell>` 即可获得统一的移动端宽度约束。
- *
- * 本组件无 hooks，可作为 Server Component 直接 SSR。
- */
 import type { ReactNode } from "react";
 
-import styles from "./mobile-shell.module.css";
+import { ResponsiveMobileShell } from "./responsive-mobile-shell";
 
 export interface MobileShellProps {
   children: ReactNode;
@@ -26,13 +16,8 @@ export function MobileShell({
   className,
 }: MobileShellProps) {
   return (
-    <div className={styles.shell}>
-      <div
-        className={[styles.content, className].filter(Boolean).join(" ")}
-        style={background ? { background } : undefined}
-      >
-        {children}
-      </div>
-    </div>
+    <ResponsiveMobileShell background={background} className={className}>
+      {children}
+    </ResponsiveMobileShell>
   );
 }
diff --git a/src/app/_components/core/page-scaffold.module.css b/src/app/_components/core/page-scaffold.module.css
new file mode 100644
index 00000000..5cdad6f4
--- /dev/null
+++ b/src/app/_components/core/page-scaffold.module.css
@@ -0,0 +1,50 @@
+.root {
+  position: relative;
+  display: flex;
+  flex: 1 1 auto;
+  min-height: var(--app-viewport-height, 100dvh);
+  min-width: 0;
+  flex-direction: column;
+  box-sizing: border-box;
+  color: var(--color-text-foreground, #171717);
+  overflow: hidden;
+}
+
+.root[data-scrollable="true"] {
+  overflow-y: auto;
+  -webkit-overflow-scrolling: touch;
+}
+
+.padded {
+  padding:
+    calc(var(--page-padding-y, 18px) + var(--app-safe-top, 0px))
+    calc(var(--page-padding-x, 20px) + var(--app-safe-right, 0px))
+    calc(var(--page-padding-y, 18px) + var(--app-safe-bottom, 0px))
+    calc(var(--page-padding-x, 20px) + var(--app-safe-left, 0px));
+}
+
+.header,
+.footer {
+  position: relative;
+  z-index: 1;
+  flex: 0 0 auto;
+}
+
+.body {
+  position: relative;
+  z-index: 1;
+  display: flex;
+  flex: 1 1 auto;
+  min-height: 0;
+  min-width: 0;
+  flex-direction: column;
+}
+
+.body[data-scrollable="true"] {
+  overflow-y: auto;
+  -webkit-overflow-scrolling: touch;
+}
+
+.footer {
+  padding-bottom: var(--app-safe-bottom, 0px);
+}
diff --git a/src/app/_components/core/page-scaffold.tsx b/src/app/_components/core/page-scaffold.tsx
new file mode 100644
index 00000000..b1dc9588
--- /dev/null
+++ b/src/app/_components/core/page-scaffold.tsx
@@ -0,0 +1,49 @@
+import type { ReactNode } from "react";
+
+import styles from "./page-scaffold.module.css";
+
+export interface PageScaffoldProps {
+  children: ReactNode;
+  header?: ReactNode;
+  footer?: ReactNode;
+  className?: string;
+  bodyClassName?: string;
+  padded?: boolean;
+  scrollable?: boolean;
+  bodyScrollable?: boolean;
+}
+
+/**
+ * Shared page layout primitive for mobile-first screens.
+ *
+ * Use it when migrating feature pages away from hand-written shell/padding
+ * styles. It keeps safe-area padding and scroll ownership in one place.
+ */
+export function PageScaffold({
+  children,
+  header,
+  footer,
+  className,
+  bodyClassName,
+  padded = true,
+  scrollable = false,
+  bodyScrollable = false,
+}: PageScaffoldProps) {
+  return (
+    <main
+      className={[styles.root, padded ? styles.padded : "", className]
+        .filter(Boolean)
+        .join(" ")}
+      data-scrollable={scrollable}
+    >
+      {header ? <div className={styles.header}>{header}</div> : null}
+      <div
+        className={[styles.body, bodyClassName].filter(Boolean).join(" ")}
+        data-scrollable={bodyScrollable}
+      >
+        {children}
+      </div>
+      {footer ? <div className={styles.footer}>{footer}</div> : null}
+    </main>
+  );
+}
diff --git a/src/app/_components/core/mobile-shell.module.css b/src/app/_components/core/responsive-mobile-shell.module.css
similarity index 55%
rename from src/app/_components/core/mobile-shell.module.css
rename to src/app/_components/core/responsive-mobile-shell.module.css
index df2f07e6..bee6708b 100644
--- a/src/app/_components/core/mobile-shell.module.css
+++ b/src/app/_components/core/responsive-mobile-shell.module.css
@@ -1,19 +1,29 @@
 .shell {
   display: flex;
   flex: 1 1 auto;
-  align-items: stretch;
-  justify-content: center;
   width: 100%;
+  min-width: 0;
   min-height: var(--app-viewport-height, 100dvh);
-  background: #000000; /* 显式黑，桌面端移动壳外圈为黑色 */
+  justify-content: center;
+  background: var(--mobile-shell-outer-background, #000000);
+  overflow-x: hidden;
 }
 
 .content {
   position: relative;
   display: flex;
   flex: 1 1 auto;
-  flex-direction: column;
+  min-width: 0;
   width: 100%;
   max-width: var(--app-max-width, 540px);
   min-height: var(--app-viewport-height, 100dvh);
+  flex-direction: column;
+  background: var(--mobile-shell-background, transparent);
+  overflow-x: clip;
+}
+
+@supports not (overflow: clip) {
+  .content {
+    overflow-x: hidden;
+  }
 }
diff --git a/src/app/_components/core/responsive-mobile-shell.tsx b/src/app/_components/core/responsive-mobile-shell.tsx
new file mode 100644
index 00000000..55f7e2a4
--- /dev/null
+++ b/src/app/_components/core/responsive-mobile-shell.tsx
@@ -0,0 +1,33 @@
+import type { CSSProperties, ReactNode } from "react";
+
+import styles from "./responsive-mobile-shell.module.css";
+
+export interface ResponsiveMobileShellProps {
+  children: ReactNode;
+  /** Background used inside the mobile canvas. */
+  background?: string;
+  /** Background used outside the mobile canvas on wider screens. */
+  outerBackground?: string;
+  /** Class applied to the mobile canvas. */
+  className?: string;
+}
+
+export function ResponsiveMobileShell({
+  children,
+  background,
+  outerBackground,
+  className,
+}: ResponsiveMobileShellProps) {
+  const style = {
+    "--mobile-shell-background": background,
+    "--mobile-shell-outer-background": outerBackground,
+  } as CSSProperties;
+
+  return (
+    <div className={styles.shell} style={style}>
+      <div className={[styles.content, className].filter(Boolean).join(" ")}>
+        {children}
+      </div>
+    </div>
+  );
+}
diff --git a/src/app/_components/core/scrollable-page.module.css b/src/app/_components/core/scrollable-page.module.css
new file mode 100644
index 00000000..4ed295fe
--- /dev/null
+++ b/src/app/_components/core/scrollable-page.module.css
@@ -0,0 +1,8 @@
+.scroll {
+  flex: 1 1 auto;
+  min-height: 0;
+  min-width: 0;
+  overflow-y: auto;
+  overscroll-behavior-y: contain;
+  -webkit-overflow-scrolling: touch;
+}
diff --git a/src/app/_components/core/scrollable-page.tsx b/src/app/_components/core/scrollable-page.tsx
new file mode 100644
index 00000000..aec3be45
--- /dev/null
+++ b/src/app/_components/core/scrollable-page.tsx
@@ -0,0 +1,16 @@
+import type { ReactNode } from "react";
+
+import styles from "./scrollable-page.module.css";
+
+export interface ScrollablePageProps {
+  children: ReactNode;
+  className?: string;
+}
+
+export function ScrollablePage({ children, className }: ScrollablePageProps) {
+  return (
+    <div className={[styles.scroll, className].filter(Boolean).join(" ")}>
+      {children}
+    </div>
+  );
+}
diff --git a/src/app/coins-rules/coins-rules-screen.module.css b/src/app/coins-rules/coins-rules-screen.module.css
index a6f37433..ae61949e 100644
--- a/src/app/coins-rules/coins-rules-screen.module.css
+++ b/src/app/coins-rules/coins-rules-screen.module.css
@@ -1,7 +1,11 @@
 .screen {
   min-height: 100dvh;
   box-sizing: border-box;
-  padding: 18px 20px 28px;
+  padding:
+    calc(var(--page-padding-y, 18px) + var(--app-safe-top, 0px))
+    calc(var(--page-padding-x, 20px) + var(--app-safe-right, 0px))
+    calc(var(--page-padding-y, 28px) + var(--app-safe-bottom, 0px))
+    calc(var(--page-padding-x, 20px) + var(--app-safe-left, 0px));
   background:
     radial-gradient(circle at 16% 5%, rgba(255, 196, 143, 0.2), transparent 28%),
     radial-gradient(circle at 86% 8%, rgba(246, 87, 160, 0.2), transparent 26%),
@@ -12,15 +16,15 @@
 .header {
   display: flex;
   flex-direction: column;
-  gap: 18px;
+  gap: var(--page-section-gap, 18px);
 }
 
 .hero {
   position: relative;
   overflow: hidden;
-  padding: 22px;
+  padding: var(--responsive-card-padding-lg, 22px);
   border: 1px solid rgba(246, 87, 160, 0.14);
-  border-radius: 28px;
+  border-radius: var(--responsive-card-radius, 28px);
   background:
     linear-gradient(135deg, rgba(255, 255, 255, 0.88) 0%, rgba(255, 237, 246, 0.94) 100%),
     #ffffff;
@@ -55,7 +59,7 @@
 .eyebrow {
   margin: 16px 0 0;
   color: #f657a0;
-  font-size: 12px;
+  font-size: var(--responsive-micro, 12px);
   font-weight: 850;
   letter-spacing: 0.12em;
   line-height: 1;
@@ -65,7 +69,7 @@
 .title {
   margin: 8px 0 0;
   color: #171114;
-  font-size: 30px;
+  font-size: var(--responsive-page-title, 30px);
   font-weight: 900;
   letter-spacing: -0.8px;
   line-height: 1.08;
@@ -75,7 +79,7 @@
   max-width: 300px;
   margin: 10px 0 0;
   color: #6d5d64;
-  font-size: 15px;
+  font-size: var(--responsive-body, 15px);
   font-weight: 650;
   line-height: 1.55;
 }
@@ -85,10 +89,10 @@
   grid-template-columns: auto minmax(0, 1fr);
   gap: 12px;
   align-items: center;
-  margin-top: 16px;
-  padding: 16px;
+  margin-top: var(--page-section-gap, 16px);
+  padding: var(--responsive-card-padding, 16px);
   border: 1px solid rgba(248, 184, 62, 0.24);
-  border-radius: 22px;
+  border-radius: var(--responsive-card-radius-sm, 22px);
   background: rgba(255, 250, 235, 0.84);
   box-shadow: 0 12px 28px rgba(142, 93, 18, 0.08);
 }
@@ -108,7 +112,7 @@
 .freeTitle {
   margin: 0;
   color: #2a1f14;
-  font-size: 16px;
+  font-size: var(--responsive-body, 16px);
   font-weight: 850;
   line-height: 1.1;
 }
@@ -116,7 +120,7 @@
 .freeText {
   margin: 5px 0 0;
   color: #7a6040;
-  font-size: 13px;
+  font-size: var(--responsive-caption, 13px);
   font-weight: 650;
   line-height: 1.45;
 }
@@ -125,7 +129,7 @@
   display: flex;
   flex-direction: column;
   gap: 10px;
-  margin-top: 16px;
+  margin-top: var(--page-section-gap, 16px);
 }
 
 .ruleCard {
@@ -133,9 +137,9 @@
   grid-template-columns: auto minmax(0, 1fr) auto;
   gap: 12px;
   align-items: center;
-  padding: 14px;
+  padding: var(--responsive-card-padding, 14px);
   border: 1px solid rgba(25, 19, 22, 0.06);
-  border-radius: 20px;
+  border-radius: var(--responsive-card-radius-sm, 20px);
   background: rgba(255, 255, 255, 0.9);
   box-shadow: 0 10px 26px rgba(55, 36, 44, 0.06);
   animation: cardIn 0.42s ease both;
@@ -165,7 +169,7 @@
 .ruleTitle {
   margin: 0;
   color: #21191d;
-  font-size: 16px;
+  font-size: var(--responsive-body, 16px);
   font-weight: 850;
   line-height: 1.15;
 }
@@ -177,7 +181,7 @@
   border-radius: 999px;
   background: #edf4ff;
   color: #2e6eea;
-  font-size: 12px;
+  font-size: var(--responsive-micro, 12px);
   font-weight: 780;
   line-height: 1;
 }
@@ -185,7 +189,7 @@
 .cost {
   margin: 0;
   color: #171114;
-  font-size: 15px;
+  font-size: var(--responsive-body, 15px);
   font-weight: 900;
   line-height: 1.15;
   text-align: right;
diff --git a/src/app/globals.css b/src/app/globals.css
index 8f3bb0e6..1024195b 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -24,4 +24,11 @@ body {
   background: var(--color-page-background);
   color: var(--color-text-foreground);
   font-family: var(--font-system);
+  overflow-x: hidden;
+}
+
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
 }
diff --git a/src/app/sidebar/components/sidebar-screen.module.css b/src/app/sidebar/components/sidebar-screen.module.css
index b34c3e8a..fa83b332 100644
--- a/src/app/sidebar/components/sidebar-screen.module.css
+++ b/src/app/sidebar/components/sidebar-screen.module.css
@@ -6,7 +6,11 @@
   overflow: hidden;
   min-height: 100dvh;
   box-sizing: border-box;
-  padding: 0 var(--page-padding-x, 28px) 28px;
+  padding:
+    var(--app-safe-top, 0px)
+    calc(var(--page-padding-x, 28px) + var(--app-safe-right, 0px))
+    calc(var(--page-padding-y, 20px) + var(--app-safe-bottom, 0px))
+    calc(var(--page-padding-x, 28px) + var(--app-safe-left, 0px));
   background:
     radial-gradient(circle at 18% 6%, rgba(255, 206, 160, 0.22), transparent 28%),
     radial-gradient(circle at 92% 0%, rgba(246, 87, 160, 0.22), transparent 30%),
@@ -49,13 +53,13 @@
 }
 
 .topBar {
-  margin: 18px 0 -2px;
+  margin: var(--page-padding-y, 18px) 0 -2px;
 }
 
 .hero {
-  padding: 18px;
+  padding: var(--responsive-card-padding, 18px);
   border: 1px solid rgba(246, 87, 160, 0.12);
-  border-radius: 26px;
+  border-radius: var(--responsive-card-radius, 26px);
   background:
     linear-gradient(135deg, rgba(255, 255, 255, 0.76) 0%, rgba(255, 239, 246, 0.84) 100%),
     #ffffff;
@@ -66,7 +70,7 @@
 .kicker {
   margin: 0;
   color: #f657a0;
-  font-size: 12px;
+  font-size: var(--responsive-micro, 12px);
   font-weight: 850;
   letter-spacing: 0.14em;
   line-height: 1;
@@ -76,7 +80,7 @@
 .title {
   margin: 8px 0 0;
   color: #171114;
-  font-size: 34px;
+  font-size: var(--responsive-display-title, 34px);
   font-weight: 920;
   letter-spacing: -1px;
   line-height: 1;
@@ -86,15 +90,15 @@
   max-width: 320px;
   margin: 10px 0 0;
   color: #75636a;
-  font-size: 14px;
+  font-size: var(--responsive-caption, 14px);
   font-weight: 650;
   line-height: 1.5;
 }
 
 .userSlot {
-  padding: 18px;
+  padding: var(--responsive-card-padding, 18px);
   border: 1px solid rgba(25, 19, 22, 0.06);
-  border-radius: 26px;
+  border-radius: var(--responsive-card-radius, 26px);
   background: rgba(255, 255, 255, 0.84);
   box-shadow: 0 16px 40px rgba(55, 36, 44, 0.08);
   backdrop-filter: blur(18px);
@@ -113,7 +117,7 @@
   margin: 0 0 9px;
   padding: 0 4px;
   color: #817076;
-  font-size: 13px;
+  font-size: var(--responsive-caption, 13px);
   font-weight: 800;
   letter-spacing: 0.04em;
   text-transform: uppercase;
@@ -125,9 +129,9 @@
   align-items: center;
   gap: 12px;
   box-sizing: border-box;
-  padding: 16px;
+  padding: var(--responsive-card-padding, 16px);
   border: 1px solid rgba(25, 19, 22, 0.06);
-  border-radius: 22px;
+  border-radius: var(--responsive-card-radius-sm, 22px);
   background: rgba(255, 255, 255, 0.86);
   color: #171114;
   cursor: pointer;
@@ -173,14 +177,14 @@
 
 .logoutTitle {
   color: #ef4d64;
-  font-size: 16px;
+  font-size: var(--responsive-body, 16px);
   font-weight: 760;
   line-height: 1.15;
 }
 
 .logoutSubtitle {
   color: #817076;
-  font-size: 13px;
+  font-size: var(--responsive-caption, 13px);
   font-weight: 620;
   line-height: 1.25;
 }
diff --git a/src/app/sidebar/components/sidebar-wallet-card.module.css b/src/app/sidebar/components/sidebar-wallet-card.module.css
index 4c4d7208..c3679b32 100644
--- a/src/app/sidebar/components/sidebar-wallet-card.module.css
+++ b/src/app/sidebar/components/sidebar-wallet-card.module.css
@@ -1,13 +1,13 @@
 .card {
   display: grid;
   grid-template-columns: minmax(0, 1fr) auto;
-  gap: 18px;
+  gap: var(--page-section-gap, 18px);
   align-items: center;
   width: 100%;
   box-sizing: border-box;
-  padding: 18px;
+  padding: var(--responsive-card-padding, 18px);
   border: 1px solid rgba(246, 87, 160, 0.16);
-  border-radius: 24px;
+  border-radius: var(--responsive-card-radius, 24px);
   background:
     linear-gradient(135deg, rgba(255, 255, 255, 0.92) 0%, rgba(255, 239, 246, 0.94) 100%),
     #ffffff;
@@ -48,7 +48,7 @@
 .title {
   margin: 0;
   color: #191316;
-  font-size: 18px;
+  font-size: var(--responsive-card-title, 18px);
   font-weight: 800;
   line-height: 1.15;
 }
@@ -60,14 +60,14 @@
 }
 
 .balanceValue {
-  font-size: 22px;
+  font-size: var(--responsive-page-title, 22px);
   font-weight: 850;
   letter-spacing: -0.4px;
 }
 
 .balanceUnit {
   color: #4f4449;
-  font-size: 16px;
+  font-size: var(--responsive-body, 16px);
   font-weight: 750;
 }
 
@@ -83,7 +83,7 @@
   color: #2e6eea;
   cursor: pointer;
   font: inherit;
-  font-size: 15px;
+  font-size: var(--responsive-body, 15px);
   font-weight: 760;
   line-height: 1.2;
   text-align: left;
@@ -110,7 +110,7 @@
 .topUpButton {
   display: inline-flex;
   min-width: 92px;
-  min-height: 44px;
+  min-height: var(--responsive-control-height, 44px);
   align-items: center;
   justify-content: center;
   padding: 0 18px;
@@ -118,7 +118,7 @@
   border-radius: 18px;
   cursor: pointer;
   font: inherit;
-  font-size: 15px;
+  font-size: var(--responsive-body, 15px);
   font-weight: 850;
   letter-spacing: 0.1px;
   transition: box-shadow 0.18s ease, opacity 0.18s ease, transform 0.18s ease,
diff --git a/src/app/subscription/components/subscription-coins-offer-section.module.css b/src/app/subscription/components/subscription-coins-offer-section.module.css
index 06c4f060..ef700ae6 100644
--- a/src/app/subscription/components/subscription-coins-offer-section.module.css
+++ b/src/app/subscription/components/subscription-coins-offer-section.module.css
@@ -1,7 +1,7 @@
 .section {
   overflow: hidden;
   border: 1px solid rgba(17, 17, 17, 0.12);
-  border-radius: 28px;
+  border-radius: var(--responsive-card-radius, 28px);
   background: #fff8df;
   box-shadow: 0 16px 42px rgba(220, 162, 36, 0.12);
   backdrop-filter: blur(18px);
@@ -9,7 +9,10 @@
 
 .heading {
   position: relative;
-  padding: 18px 18px 22px;
+  padding:
+    var(--responsive-card-padding, 18px)
+    var(--responsive-card-padding, 18px)
+    var(--responsive-card-padding-lg, 22px);
   background:
     linear-gradient(135deg, #fffdf2 0%, #fff3c8 58%, #ffe8a6 100%),
     #fff3c8;
@@ -18,7 +21,7 @@
 .title {
   margin: 0;
   color: #181014;
-  font-size: 22px;
+  font-size: var(--responsive-page-title, 22px);
   font-weight: 800;
   line-height: 1.2;
 }
@@ -38,8 +41,11 @@
   z-index: 1;
   display: flex;
   flex-direction: column;
-  gap: 8px;
-  padding: 18px 12px 14px;
+  gap: var(--spacing-sm, 8px);
+  padding:
+    var(--responsive-card-padding, 18px)
+    clamp(10px, 2.222vw, 12px)
+    clamp(12px, 2.593vw, 14px);
   background: transparent;
 }
 
@@ -48,10 +54,10 @@
   grid-template-columns: 48px minmax(0, 1fr) auto auto;
   align-items: center;
   width: 100%;
-  min-height: 48px;
+  min-height: var(--responsive-control-height, 48px);
   padding: 8px 12px 8px 6px;
   border: 1px solid transparent;
-  border-radius: 18px;
+  border-radius: var(--responsive-card-radius-sm, 18px);
   background: #ffffff;
   color: #53484d;
   cursor: pointer;
@@ -97,7 +103,7 @@
 
 .coins {
   min-width: 0;
-  font-size: 16px;
+  font-size: var(--responsive-body, 16px);
   font-weight: 700;
   line-height: 1.2;
 }
@@ -108,7 +114,7 @@
   border-radius: 999px;
   background: linear-gradient(135deg, #ff5fae 0%, #ff8a34 100%);
   color: #ffffff;
-  font-size: 14px;
+  font-size: clamp(10px, 2.593vw, 14px);
   font-weight: 900;
   line-height: 1;
   white-space: nowrap;
@@ -125,7 +131,7 @@
 }
 
 .price {
-  font-size: 16px;
+  font-size: var(--responsive-body, 16px);
   font-weight: 800;
   line-height: 1.2;
   white-space: nowrap;
@@ -134,7 +140,7 @@
 .originalPrice {
   margin-top: 3px;
   color: #9c8b91;
-  font-size: 12px;
+  font-size: var(--responsive-micro, 12px);
   font-weight: 800;
   line-height: 1;
   text-decoration: line-through;
diff --git a/src/app/subscription/components/subscription-screen.module.css b/src/app/subscription/components/subscription-screen.module.css
index 43ecc274..7bb8f982 100644
--- a/src/app/subscription/components/subscription-screen.module.css
+++ b/src/app/subscription/components/subscription-screen.module.css
@@ -5,7 +5,11 @@
   background:
     radial-gradient(circle at 8% 4%, rgba(255, 255, 255, 0.95) 0 90px, transparent 160px),
     linear-gradient(180deg, #fff9fb 0%, #fcf3f4 52%, #fffefe 100%);
-  padding: 18px 20px 10px;
+  padding:
+    calc(var(--page-padding-y, 18px) + var(--app-safe-top, 0px))
+    calc(var(--page-padding-x, 20px) + var(--app-safe-right, 0px))
+    calc(10px + var(--app-safe-bottom, 0px))
+    calc(var(--page-padding-x, 20px) + var(--app-safe-left, 0px));
 }
 
 .header {
@@ -21,11 +25,11 @@
 .firstRechargeBanner {
   display: flex;
   align-items: center;
-  gap: 12px;
-  margin-top: 14px;
-  padding: 12px 14px;
+  gap: var(--spacing-md, 12px);
+  margin-top: var(--page-section-gap, 14px);
+  padding: clamp(10px, 2.222vw, 12px) clamp(12px, 2.593vw, 14px);
   border: 1px solid rgba(255, 95, 174, 0.28);
-  border-radius: 22px;
+  border-radius: var(--responsive-card-radius-sm, 22px);
   background:
     linear-gradient(135deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 239, 248, 0.94) 100%),
     #ffffff;
@@ -38,7 +42,7 @@
   border-radius: 999px;
   background: linear-gradient(135deg, #ff5fae 0%, #ff8a34 100%);
   color: #ffffff;
-  font-size: 20;
+  font-size: clamp(20px, 5.185vw, 28px);
   font-weight: 900;
   line-height: 1;
   box-shadow: 0 10px 22px rgba(255, 95, 174, 0.25);
@@ -51,7 +55,7 @@
 .firstRechargeTitle {
   margin: 0;
   color: #181014;
-  font-size: 17px;
+  font-size: var(--responsive-card-title, 17px);
   font-weight: 900;
   line-height: 1.15;
 }
@@ -59,7 +63,7 @@
 .firstRechargeSubtitle {
   margin: 4px 0 0;
   color: #75656d;
-  font-size: 12px;
+  font-size: var(--responsive-micro, 12px);
   font-weight: 700;
   line-height: 1.25;
 }
@@ -67,8 +71,8 @@
 .offerStack {
   display: flex;
   flex-direction: column;
-  gap: 18px;
-  margin-top: 14px;
+  gap: var(--page-section-gap, 18px);
+  margin-top: var(--page-section-gap, 14px);
 }
 
 .userSlot {
@@ -92,7 +96,7 @@
   margin: 0;
   padding: var(--spacing-md) var(--spacing-xs);
   color: var(--color-text-secondary);
-  font-size: var(--font-size-sm);
+  font-size: var(--responsive-caption, var(--font-size-sm));
   text-align: center;
   line-height: 1.5;
 }
@@ -100,7 +104,7 @@
 .autoRenewCaption {
   margin-top: var(--spacing-xxl);
   padding: 0 var(--spacing-xs);
-  font-size: var(--font-size-lg);
+  font-size: var(--responsive-body, var(--font-size-lg));
   color: #3c3b3b;
 }
 
@@ -113,11 +117,11 @@
 }
 
 .paymentMethodSlot {
-  margin-top: 22px;
+  margin-top: var(--page-section-gap-lg, 22px);
 }
 
 .ctaSlot {
-  margin-top: 22px;
+  margin-top: var(--page-section-gap-lg, 22px);
 }
 
 .agreementSlot {
@@ -126,7 +130,7 @@
 }
 
 .agreementLabel {
-  font-size: 12px;
+  font-size: var(--responsive-micro, 12px);
 }
 
 .agreementLink {
diff --git a/src/app/subscription/components/subscription-vip-offer-section.module.css b/src/app/subscription/components/subscription-vip-offer-section.module.css
index de6a3639..5ec6f9e3 100644
--- a/src/app/subscription/components/subscription-vip-offer-section.module.css
+++ b/src/app/subscription/components/subscription-vip-offer-section.module.css
@@ -1,7 +1,7 @@
 .section {
   overflow: hidden;
   border: 1px solid rgba(255, 71, 166, 0.28);
-  border-radius: 28px;
+  border-radius: var(--responsive-card-radius, 28px);
   background: #ffe2f0;
   box-shadow: 0 18px 45px rgba(255, 71, 166, 0.22);
   backdrop-filter: blur(18px);
@@ -9,7 +9,10 @@
 
 .summary {
   position: relative;
-  padding: 18px 18px 22px;
+  padding:
+    var(--responsive-card-padding, 18px)
+    var(--responsive-card-padding, 18px)
+    var(--responsive-card-padding-lg, 22px);
   background:
     linear-gradient(135deg, #ff9bd1 0%, #ff61ad 56%, #f657a0 100%),
     #ff61ad;
@@ -25,20 +28,20 @@
 
 .titleText {
   color: #181014;
-  font-size: 20px;
+  font-size: var(--responsive-section-title, 20px);
   font-weight: 800;
 }
 
 .renewText {
   color: rgba(255, 255, 255, 0.82);
-  font-size: 13px;
+  font-size: var(--responsive-caption, 13px);
   font-weight: 700;
 }
 
 .subtitle {
   margin: 8px 0 0;
   color: rgba(255, 255, 255, 0.9);
-  font-size: 15px;
+  font-size: var(--responsive-body, 15px);
   font-weight: 700;
   line-height: 1.3;
 }
@@ -58,21 +61,24 @@
   z-index: 1;
   display: grid;
   grid-template-columns: repeat(3, minmax(0, 1fr));
-  gap: 9px;
-  padding: 18px 10px 12px;
+  gap: clamp(7px, 1.667vw, 9px);
+  padding:
+    var(--responsive-card-padding, 18px)
+    clamp(8px, 1.852vw, 10px)
+    clamp(10px, 2.222vw, 12px);
 }
 
 .planCard {
   position: relative;
   display: flex;
   min-width: 0;
-  min-height: 128px;
+  min-height: clamp(116px, 23.704vw, 128px);
   flex-direction: column;
   align-items: center;
   justify-content: center;
-  padding: 12px 6px 11px;
+  padding: clamp(10px, 2.222vw, 12px) 6px clamp(9px, 2.037vw, 11px);
   border: 1px solid rgba(246, 87, 160, 0.08);
-  border-radius: 20px;
+  border-radius: var(--responsive-card-radius-sm, 20px);
   background: #ffffff;
   color: #181014;
   cursor: pointer;
@@ -111,7 +117,7 @@
   border-radius: 999px;
   background: linear-gradient(135deg, #ff5fae 0%, #ff8a34 100%);
   color: #ffffff;
-  font-size: 16px;
+  font-size: clamp(12px, 2.963vw, 16px);
   font-weight: 900;
   line-height: 1;
   white-space: nowrap;
@@ -121,7 +127,7 @@
 
 .planTitle {
   margin-top: 20px;
-  font-size: 19px;
+  font-size: clamp(16px, 3.519vw, 19px);
   font-weight: 800;
   line-height: 1.15;
   white-space: nowrap;
@@ -136,7 +142,7 @@
 }
 
 .price {
-  font-size: 30px;
+  font-size: var(--font-responsive-number-lg, 30px);
   font-weight: 500;
   letter-spacing: -0.8px;
 }
@@ -144,7 +150,7 @@
 .currency {
   margin-bottom: 3px;
   color: #8b717a;
-  font-size: 12px;
+  font-size: var(--responsive-micro, 12px);
   font-weight: 700;
   text-transform: lowercase;
 }
@@ -152,7 +158,7 @@
 .originalPrice {
   margin-top: 10px;
   color: #9c8b91;
-  font-size: 14px;
+  font-size: var(--responsive-caption, 14px);
   font-weight: 800;
   line-height: 1;
   text-decoration: line-through;
diff --git a/src/core/breakpoints.ts b/src/core/breakpoints.ts
index 16bd50b2..91136b91 100644
--- a/src/core/breakpoints.ts
+++ b/src/core/breakpoints.ts
@@ -3,13 +3,15 @@
  *
  * 
  *
- * 与 `src/design/breakpoints.css` 中的 CSS 变量保持一致：
+ * 与 `src/tokens/breakpoints.css` 中的 CSS 变量保持一致：
  *  - 客户端运行时检查（matchMedia）通过 `useBreakpoint` hook
- *  - 服务端 / 客户端 CSS 通过 `src/design/breakpoints.css` 的 media query
+ *  - 服务端 / 客户端 CSS 通过 `src/tokens/breakpoints.css` 的 media query
  */
 export const Breakpoints = {
-  /** 手机设备最大宽度 */
-  mobileMaxWidth: 500,
+  /** 手机设备最大宽度。 */
+  mobileMaxWidth: 599.98,
+  /** 移动端画布最大宽度，来自 1080px @2x 设计稿。 */
+  shellMaxWidth: 540,
   /** 平板设备最小宽度 */
   tabletMinWidth: 600,
   /** 平板设备最大宽度 */
diff --git a/src/hooks/use-breakpoint.ts b/src/hooks/use-breakpoint.ts
index f28277e6..6a0cb6f0 100644
--- a/src/hooks/use-breakpoint.ts
+++ b/src/hooks/use-breakpoint.ts
@@ -15,12 +15,12 @@
  */
 import { useSyncExternalStore } from "react";
 
-import type { DeviceSize } from "@/core/breakpoints";
+import { Breakpoints, type DeviceSize } from "@/core/breakpoints";
 
 const QUERIES = {
-  mobile: "(max-width: 599.98px)",
-  tablet: "(min-width: 600px) and (max-width: 1023.98px)",
-  desktop: "(min-width: 1024px)",
+  mobile: `(max-width: ${Breakpoints.mobileMaxWidth}px)`,
+  tablet: `(min-width: ${Breakpoints.tabletMinWidth}px) and (max-width: ${Breakpoints.tabletMaxWidth}px)`,
+  desktop: `(min-width: ${Breakpoints.desktopMinWidth}px)`,
 } as const satisfies Record<DeviceSize, string>;
 
 const subscribe = (cb: () => void): (() => void) => {
diff --git a/src/providers/root-providers.tsx b/src/providers/root-providers.tsx
index df6cecdf..5c854c15 100644
--- a/src/providers/root-providers.tsx
+++ b/src/providers/root-providers.tsx
@@ -16,6 +16,7 @@
 
 import type { ReactNode } from "react";
 
+import { ViewportCssVarsProvider } from "@/providers/viewport-css-vars-provider";
 import { AuthProvider } from "@/stores/auth/auth-context";
 import { AuthStatusChecker } from "@/stores/auth/auth-status-checker";
 import { OAuthSessionSync } from "@/stores/auth/oauth-session-sync";
@@ -34,23 +35,25 @@ export interface RootProvidersProps {
 
 export function RootProviders({ children }: RootProvidersProps) {
   return (
-    <AuthProvider>
-      {/* AuthStatusChecker 必须在 AuthProvider 内部（依赖 useAuthDispatch），
-       * 必须在 UserProvider/ChatProvider 外部（它们可能在 init 完成前就 mount） */}
-      <AuthStatusChecker />
-      {/* OAuthSessionSync 同样依赖 AuthProvider 上下文 */}
-      <OAuthSessionSync />
-      <UserProvider>
-        <UserAuthSync />
-        <PaymentProvider>
-          <ChatProvider>
-            <ChatAuthSync />
-            <PaymentSuccessSync />
-            {children}
-            <div id="toast-portal" />
-          </ChatProvider>
-        </PaymentProvider>
-      </UserProvider>
-    </AuthProvider>
+    <ViewportCssVarsProvider>
+      <AuthProvider>
+        {/* AuthStatusChecker 必须在 AuthProvider 内部（依赖 useAuthDispatch），
+         * 必须在 UserProvider/ChatProvider 外部（它们可能在 init 完成前就 mount） */}
+        <AuthStatusChecker />
+        {/* OAuthSessionSync 同样依赖 AuthProvider 上下文 */}
+        <OAuthSessionSync />
+        <UserProvider>
+          <UserAuthSync />
+          <PaymentProvider>
+            <ChatProvider>
+              <ChatAuthSync />
+              <PaymentSuccessSync />
+              {children}
+              <div id="toast-portal" />
+            </ChatProvider>
+          </PaymentProvider>
+        </UserProvider>
+      </AuthProvider>
+    </ViewportCssVarsProvider>
   );
 }
diff --git a/src/providers/viewport-css-vars-provider.tsx b/src/providers/viewport-css-vars-provider.tsx
new file mode 100644
index 00000000..375a8dbb
--- /dev/null
+++ b/src/providers/viewport-css-vars-provider.tsx
@@ -0,0 +1,87 @@
+"use client";
+
+import { useEffect, type ReactNode } from "react";
+
+const CSS_VAR_VIEWPORT_HEIGHT = "--app-viewport-height";
+const CSS_VAR_VISIBLE_HEIGHT = "--app-visible-height";
+const CSS_VAR_VISIBLE_OFFSET_TOP = "--app-visible-offset-top";
+const CSS_VAR_SAFE_TOP = "--app-safe-top";
+const CSS_VAR_SAFE_RIGHT = "--app-safe-right";
+const CSS_VAR_SAFE_BOTTOM = "--app-safe-bottom";
+const CSS_VAR_SAFE_LEFT = "--app-safe-left";
+
+export interface ViewportCssVarsProviderProps {
+  children: ReactNode;
+}
+
+/**
+ * Keeps viewport-related CSS variables in sync with the real visual viewport.
+ *
+ * CSS already has safe defaults (`100dvh` and `env(safe-area-inset-*)`). This
+ * client provider improves Safari/PWA/WebView behavior after hydration without
+ * pushing viewport measurements into React state.
+ */
+export function ViewportCssVarsProvider({
+  children,
+}: ViewportCssVarsProviderProps) {
+  useEffect(() => {
+    if (typeof window === "undefined") return;
+
+    let frameId: number | null = null;
+
+    const applyVars = () => {
+      frameId = null;
+      const root = document.documentElement;
+      const viewport = window.visualViewport;
+      const layoutHeight = window.innerHeight;
+      const layoutWidth = window.innerWidth;
+      const visibleHeight = viewport?.height ?? layoutHeight;
+      const visibleWidth = viewport?.width ?? layoutWidth;
+      const visibleOffsetTop = viewport?.offsetTop ?? 0;
+
+      root.style.setProperty(CSS_VAR_VIEWPORT_HEIGHT, `${layoutHeight}px`);
+      root.style.setProperty(CSS_VAR_VISIBLE_HEIGHT, `${visibleHeight}px`);
+      root.style.setProperty(
+        CSS_VAR_VISIBLE_OFFSET_TOP,
+        `${visibleOffsetTop}px`,
+      );
+      root.style.setProperty(CSS_VAR_SAFE_TOP, "env(safe-area-inset-top, 0px)");
+      root.style.setProperty(
+        CSS_VAR_SAFE_RIGHT,
+        "env(safe-area-inset-right, 0px)",
+      );
+      root.style.setProperty(
+        CSS_VAR_SAFE_BOTTOM,
+        "env(safe-area-inset-bottom, 0px)",
+      );
+      root.style.setProperty(
+        CSS_VAR_SAFE_LEFT,
+        "env(safe-area-inset-left, 0px)",
+      );
+      root.dataset.viewportWidth = String(Math.round(visibleWidth));
+      root.dataset.viewportHeight = String(Math.round(visibleHeight));
+    };
+
+    const scheduleApply = () => {
+      if (frameId != null) return;
+      frameId = window.requestAnimationFrame(applyVars);
+    };
+
+    applyVars();
+
+    window.addEventListener("resize", scheduleApply);
+    window.addEventListener("orientationchange", scheduleApply);
+    window.visualViewport?.addEventListener("resize", scheduleApply);
+    window.visualViewport?.addEventListener("scroll", scheduleApply);
+
+    return () => {
+      if (frameId != null) window.cancelAnimationFrame(frameId);
+      window.removeEventListener("resize", scheduleApply);
+      window.removeEventListener("orientationchange", scheduleApply);
+      window.visualViewport?.removeEventListener("resize", scheduleApply);
+      window.visualViewport?.removeEventListener("scroll", scheduleApply);
+    };
+  }, []);
+
+  return children;
+}
diff --git a/src/tokens/dimensions.css b/src/tokens/dimensions.css
index f03b3d7a..5dfa4b1d 100644
--- a/src/tokens/dimensions.css
+++ b/src/tokens/dimensions.css
@@ -6,8 +6,8 @@
  */
 :root {
   /* 按钮 */
-  --button-height: 48px;
-  --button-height-lg: 56px;
+  --button-height: var(--responsive-control-height, 48px);
+  --button-height-lg: clamp(50px, 10.37vw, 56px);
 
   /* Splash Facebook 登录按钮 */
   --splash-facebook-button-height: 56px;
@@ -17,8 +17,8 @@
   --pwa-button-height: 44px;
 
   /* 对话框 */
-  --dialog-max-width: 360px;
-  --pwa-install-dialog-max-width: 360px;
+  --dialog-max-width: min(calc(100vw - 40px), 380px);
+  --pwa-install-dialog-max-width: min(calc(100vw - 40px), 380px);
   --pwa-install-container-size: 64px;
 
   /* 列表项 */
@@ -26,12 +26,12 @@
 
   /* 消息气泡 */
   --bubble-min-width: 60px;
-  --bubble-max-width: 280px;
+  --bubble-max-width: min(75vw, 280px);
   --bubble-min-height: 36px;
 
   /* 聊天媒体 */
-  --chat-media-max-width: 240px;
-  --chat-media-max-height: 240px;
+  --chat-media-max-width: min(64vw, 260px);
+  --chat-media-max-height: min(64vw, 260px);
 
   /* ==================== Auth 页尺寸（与 Dart AppDimensions / Spacing 对齐） ==================== */
   /* 输入框 / 主按钮高度（46px = Dart AppDimensions.height46） */
@@ -41,7 +41,7 @@
   --auth-social-button-height: 40px;
 
   /* 主按钮固定宽度（Dart AppDimensions.buttonWidth = 334） */
-  --auth-primary-button-width: 334px;
+  --auth-primary-button-width: min(100%, 334px);
 
   /* Logo 高度（120px） */
   --auth-logo-height: 120px;
diff --git a/src/tokens/responsive.css b/src/tokens/responsive.css
index d2ad6b3f..acfc15f8 100644
--- a/src/tokens/responsive.css
+++ b/src/tokens/responsive.css
@@ -4,15 +4,41 @@
  * 设计稿基准：1080x1920 @2x，因此 CSS 设计宽度为 540px。
  * 原则：
  * - 桌面调试最大宽度使用 --shell-max-width / --app-max-width。
- * - 组件尺寸使用 clamp(min, design-ratio vw, design-value)，在 360-540px
+ * - 组件尺寸使用 clamp(min, design-ratio vw, design-value)，在 320-540px
  *   之间平滑缩放，并避免小屏过度压缩。
+ * - 业务 CSS 优先使用语义 token，避免页面散落硬编码尺寸。
  */
 :root {
   --app-design-width: 540px;
   --app-max-width: var(--shell-max-width, 540px);
+  --app-viewport-height: 100dvh;
+  --app-visible-height: 100dvh;
+  --app-safe-top: env(safe-area-inset-top, 0px);
+  --app-safe-right: env(safe-area-inset-right, 0px);
+  --app-safe-bottom: env(safe-area-inset-bottom, 0px);
+  --app-safe-left: env(safe-area-inset-left, 0px);
 
   /* 56px @2x = 28px；小屏保留至少 22px，避免内容贴边。 */
-  --page-padding-x: clamp(22px, 5.185vw, 28px);
+  --page-padding-x: clamp(18px, 5.185vw, 28px);
+  --page-padding-y: clamp(14px, 3.333vw, 20px);
+  --page-section-gap: clamp(12px, 3.333vw, 18px);
+  --page-section-gap-lg: clamp(16px, 4.444vw, 24px);
+
+  /* 页面级语义尺寸 */
+  --responsive-display-title: clamp(28px, 6.296vw, 34px);
+  --responsive-page-title: clamp(22px, 5.185vw, 28px);
+  --responsive-section-title: clamp(17px, 3.704vw, 20px);
+  --responsive-card-title: clamp(16px, 3.333vw, 18px);
+  --responsive-body: clamp(14px, 2.963vw, 16px);
+  --responsive-caption: clamp(12px, 2.407vw, 13px);
+  --responsive-micro: clamp(10px, 2.222vw, 12px);
+
+  --responsive-card-radius: clamp(20px, 5.185vw, 28px);
+  --responsive-card-radius-sm: clamp(18px, 4.074vw, 22px);
+  --responsive-card-padding: clamp(14px, 3.333vw, 18px);
+  --responsive-card-padding-lg: clamp(18px, 4.074vw, 22px);
+  --responsive-control-height: clamp(44px, 8.889vw, 48px);
+  --responsive-icon-button-size: clamp(38px, 8.148vw, 44px);
 
   /* Sidebar 专用响应式尺寸 */
   --sidebar-user-padding-y: clamp(18px, 3.704vw, 20px);