diff --git a/apps/design-lab/e2e/pages.spec.ts b/apps/design-lab/e2e/pages.spec.ts
index cf7d179..b53f08b 100644
--- a/apps/design-lab/e2e/pages.spec.ts
+++ b/apps/design-lab/e2e/pages.spec.ts
@@ -38,7 +38,7 @@ test.describe('全局画布', () => {
 test.describe('CourseCard 规格契约', () => {
   test.beforeEach(async ({ page }) => await page.goto('/components.html'))
 
-  test('2px ink 描边 + 硬投影 + 纸叠三层边', async ({ page }) => {
+  test('2px ink 描边 + 统一硬投影（单层 ink，无纸叠）', async ({ page }) => {
     const card = page.locator('a[href="#ch1"]').first()
     await expect(card).toBeVisible()
     const s = await card.evaluate((el) => {
@@ -47,8 +47,23 @@ test.describe('CourseCard 规格契约', () => {
     })
     expect(s.bw).toBe('2px')
     expect(s.bc).toBe('rgb(17, 17, 17)')
-    expect((s.shadow.match(/rgb|#/g) ?? []).length).toBeGreaterThanOrEqual(4) // 三层纸叠+硬投影（按色值计数）
-    expect(s.shadow).toContain('rgb(17, 17, 17)')
+    // 唯一配方 --shadow-hard：恰好一层 ink 硬投影（tw 变体层均为透明占位），无纸叠多层
+    expect(s.shadow.split('rgb(17, 17, 17)').length - 1).toBe(1)
+    expect(s.shadow).toContain('rgb(17, 17, 17) 5px 5px 0px 0px')
+  })
+
+  test('基础组件投影统一：同一 token 复用，不得各写各的', async ({ page }) => {
+    const { kinds, shadows } = await page.evaluate(() => {
+      const els = [...document.querySelectorAll('[data-comp]')]
+      return {
+        kinds: [...new Set(els.map((el) => el.dataset.comp))].sort(),
+        shadows: els.map((el) => getComputedStyle(el).boxShadow),
+      }
+    })
+    expect(kinds).toEqual(['assign', 'course-card', 'entry-card', 'ticket']) // 四类基础组件都有钩子
+    expect(shadows.length).toBeGreaterThanOrEqual(6)
+    expect(new Set(shadows).size).toBe(1) // 计算值完全一致＝样式复用
+    expect(shadows[0]).toContain('rgb(17, 17, 17) 5px 5px 0px 0px')
   })
 
   test('16:9 相框：比例、3px 黑边、内阴影、章节撞色', async ({ page }) => {
diff --git a/apps/design-lab/e2e/visual.spec.ts-snapshots/colors-chromium-linux.png b/apps/design-lab/e2e/visual.spec.ts-snapshots/colors-chromium-linux.png
index a2e1e10..cd995c0 100644
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diff --git a/apps/design-lab/e2e/visual.spec.ts-snapshots/components-chromium-linux.png b/apps/design-lab/e2e/visual.spec.ts-snapshots/components-chromium-linux.png
index 26bfd82..4dc7ac4 100644
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diff --git a/apps/design-lab/e2e/visual.spec.ts-snapshots/index-chromium-linux.png b/apps/design-lab/e2e/visual.spec.ts-snapshots/index-chromium-linux.png
index c5da908..2cb8031 100644
Binary files a/apps/design-lab/e2e/visual.spec.ts-snapshots/index-chromium-linux.png and b/apps/design-lab/e2e/visual.spec.ts-snapshots/index-chromium-linux.png differ
diff --git a/apps/design-lab/e2e/visual.spec.ts-snapshots/shelf-chromium-linux.png b/apps/design-lab/e2e/visual.spec.ts-snapshots/shelf-chromium-linux.png
index 9b27718..7f5d1e3 100644
Binary files a/apps/design-lab/e2e/visual.spec.ts-snapshots/shelf-chromium-linux.png and b/apps/design-lab/e2e/visual.spec.ts-snapshots/shelf-chromium-linux.png differ
diff --git a/apps/design-lab/e2e/visual.spec.ts-snapshots/symbols-chromium-linux.png b/apps/design-lab/e2e/visual.spec.ts-snapshots/symbols-chromium-linux.png
index b70f66a..472843a 100644
Binary files a/apps/design-lab/e2e/visual.spec.ts-snapshots/symbols-chromium-linux.png and b/apps/design-lab/e2e/visual.spec.ts-snapshots/symbols-chromium-linux.png differ
diff --git a/apps/design-lab/src/components/EntryGuide.tsx b/apps/design-lab/src/components/EntryGuide.tsx
index 96dd45a..ca33615 100644
--- a/apps/design-lab/src/components/EntryGuide.tsx
+++ b/apps/design-lab/src/components/EntryGuide.tsx
@@ -5,7 +5,7 @@ export function EntryGuide() {
   return (
     <div className="flex flex-wrap gap-5">
       {PROFILES.map((p) => (
-        <div key={p.name} className="w-[252px] rounded-xl border-2 border-ink bg-paper p-3 shadow-[5px_5px_0_var(--color-ink)]">
+        <div key={p.name} data-comp="entry-card" className="w-[252px] rounded-xl border-2 border-ink bg-paper p-3 shadow-hard">
           <div className="flex items-center gap-2">
             <span
               className="flex h-[26px] w-[26px] items-center justify-center rounded-lg border-2 border-ink text-[14px]"
diff --git a/apps/design-lab/src/components/MemphisCard.tsx b/apps/design-lab/src/components/MemphisCard.tsx
index 731fe3e..3a75a51 100644
--- a/apps/design-lab/src/components/MemphisCard.tsx
+++ b/apps/design-lab/src/components/MemphisCard.tsx
@@ -68,11 +68,11 @@ export function MemphisCard({ chapter, entry, compact = false }: { chapter: Chap
     <a
       ref={boxRef}
       href={`#ch${chapter.id}`}
+      data-comp="course-card"
       className="group relative block rounded-[14px] border-2 border-ink bg-paper p-[11px] no-underline
-                 shadow-[0_3px_0_var(--color-stack1),0_5px_0_var(--color-stack2),7px_8px_0_var(--color-ink)]
-                 transition-transform duration-150 focus-visible:outline-none
-                 hover:-translate-y-[3px] hover:shadow-[0_3px_0_var(--color-stack1),0_5px_0_var(--color-stack2),10px_11px_0_var(--color-ink)]
-                 focus-visible:-translate-y-[3px] focus-visible:shadow-[0_3px_0_var(--color-stack1),0_5px_0_var(--color-stack2),10px_11px_0_var(--color-ink)]"
+                 shadow-hard transition-transform duration-150 focus-visible:outline-none
+                 hover:-translate-y-[3px] hover:shadow-hard-lift
+                 focus-visible:-translate-y-[3px] focus-visible:shadow-hard-lift"
       onMouseEnter={() => setLocked(true)}
       onMouseLeave={() => setLocked(false)}
       onFocus={() => setLocked(true)}
diff --git a/apps/design-lab/src/components/Ticket.tsx b/apps/design-lab/src/components/Ticket.tsx
index 8bcb913..5980fa4 100644
--- a/apps/design-lab/src/components/Ticket.tsx
+++ b/apps/design-lab/src/components/Ticket.tsx
@@ -5,7 +5,8 @@ import type { Chapter } from '../lib/types'
 export function Ticket({ chapter, done }: { chapter: Chapter; done: boolean }) {
   return (
     <div
-      className={`relative flex w-[216px] items-stretch overflow-hidden rounded-xl border-2 border-ink bg-paper shadow-[5px_5px_0_var(--color-ink)] ${done ? 'ticket-pk' : ''}`}
+      data-comp="ticket"
+      className={`relative flex w-[216px] items-stretch overflow-hidden rounded-xl border-2 border-ink bg-paper shadow-hard ${done ? 'ticket-pk' : ''}`}
     >
       {/* 头部媒体块：章节色纯填充，无独立边框（由票体裁切） */}
       <div className="flex w-14 shrink-0 items-center justify-center text-[22px]" style={{ background: chapter.color }}>{chapter.emoji}</div>
@@ -39,7 +40,7 @@ export function AssignBlock({
   miss: { how: string; looks: string }
 }) {
   return (
-    <div className="w-[260px] rounded-xl border-2 border-ink bg-paper p-3 shadow-[5px_5px_0_var(--color-ink)]">
+    <div data-comp="assign" className="w-[260px] rounded-xl border-2 border-ink bg-paper p-3 shadow-hard">
       <div className="flex items-center gap-2">
         <svg width="16" height="16" viewBox="0 0 18 18" aria-hidden>
           <path d="M9 1 v16 M1 9 h16" stroke="var(--color-clash2b)" strokeWidth="3.5" strokeLinecap="round" />
diff --git a/apps/design-lab/src/pages/colors/App.tsx b/apps/design-lab/src/pages/colors/App.tsx
index 8f45131..a20394f 100644
--- a/apps/design-lab/src/pages/colors/App.tsx
+++ b/apps/design-lab/src/pages/colors/App.tsx
@@ -8,8 +8,6 @@ const PAIRS = [
 const NEUTRALS = [
   { c: '#111111', n: 'ink', h: '#111111 · 描边/字/硬投影' },
   { c: '#FFF9F0', n: 'paper', h: '#FFF9F0 · 卡面/大底' },
-  { c: '#FFFFFF', n: 'stack-1', h: '#FFFFFF · 纸叠亮边' },
-  { c: '#EADFC4', n: 'stack-2', h: '#EADFC4 · 纸叠暗层' },
 ]
 const CHAPTERS6 = [
   { c: '#FF6B6B', n: 'ch1 快速开始' }, { c: '#FF8FAB', n: 'ch2 React' }, { c: '#FFD93D', n: 'ch3 更多示例' },
@@ -56,7 +54,7 @@ export function App() {
         </div>
       </Section>
       <Section label="中性阶" note="纸的世界——字、边、投影、底">
-        <div className="grid grid-cols-4 gap-3">{NEUTRALS.map((x) => <Chip key={x.n} {...x} />)}</div>
+        <div className="grid grid-cols-2 gap-3">{NEUTRALS.map((x) => <Chip key={x.n} {...x} />)}</div>
       </Section>
       <Section label="章节色" note="六章六色，只进 16:9 相框与图标瓦">
         <div className="grid grid-cols-6 gap-3">{CHAPTERS6.map((x) => <Chip key={x.n} {...x} h={x.c} />)}</div>
@@ -73,7 +71,7 @@ export function App() {
             <div className="h-10 w-40 rounded-lg bg-clash2a" />
           </DoDont>
           <DoDont text="一切鲜艳以 2px ink 描边为界">
-            <div className="h-10 w-40 rounded-lg border-2 border-ink bg-clash2a shadow-[4px_4px_0_var(--color-ink)]" />
+            <div className="h-10 w-40 rounded-lg border-2 border-ink bg-clash2a shadow-hard" />
           </DoDont>
           <DoDont bad text="大底鲜艳，字被淹没">
             <div className="flex h-10 w-40 items-center justify-center rounded-lg border-2 border-ink bg-clash1b text-[11px] font-bold">大底鲜艳</div>
diff --git a/apps/design-lab/src/pages/index/App.tsx b/apps/design-lab/src/pages/index/App.tsx
index 12405f6..573fabd 100644
--- a/apps/design-lab/src/pages/index/App.tsx
+++ b/apps/design-lab/src/pages/index/App.tsx
@@ -18,7 +18,7 @@ export function App() {
           <a
             key={p.href}
             href={p.href}
-            className="rounded-2xl border-2 border-ink bg-paper p-5 no-underline shadow-[7px_8px_0_var(--color-ink)] transition-transform hover:-translate-y-[3px]"
+            className="rounded-2xl border-2 border-ink bg-paper p-5 no-underline shadow-hard transition-transform hover:-translate-y-[3px] hover:shadow-hard-lift"
           >
             <b className="text-[17px] text-ink">{p.name}</b>
             <p className="m-0 mt-1 text-[12.5px] text-[#6b6b6b]">{p.desc}</p>
diff --git a/apps/design-lab/src/styles/tokens.css b/apps/design-lab/src/styles/tokens.css
index cacddaf..2ae6ce8 100644
--- a/apps/design-lab/src/styles/tokens.css
+++ b/apps/design-lab/src/styles/tokens.css
@@ -13,11 +13,13 @@
   /* 中性阶（纸的世界） */
   --color-ink: #111111;
   --color-paper: #fff9f0;
-  --color-stack1: #ffffff;
-  --color-stack2: #eadfc4;
   --color-mute: #8a7a5c;
   --color-body: #3d3d3d;
 
+  /* 统一硬投影——唯一投影配方，所有基础组件复用（rest / 拿起） */
+  --shadow-hard: 5px 5px 0 var(--color-ink);
+  --shadow-hard-lift: 8px 8px 0 var(--color-ink);
+
   /* 章节色别名 */
   --color-ch1: #ff6b6b;
   --color-ch2: #ff8fab;
@@ -27,11 +29,6 @@
   --color-ch6: #a78bfa;
 }
 
-/* 语义形状通用 */
-.sem-shadow {
-  filter: drop-shadow(0 1px 0 rgba(255, 255, 255, 0.9));
-}
-
 /* 票券打孔：两端各以 1/4 圆做差集（完成票专用）。
  * mask 硬停只做形状剪切（非色彩渐变）：孔真正穿透票体——露出页面底色，
  * 描边与硬投影在孔处真实断开，无需伪元素盖色近似。 */
diff --git a/docs/screenshots/design-lab/pr_colors.png b/docs/screenshots/design-lab/pr_colors.png
index a2e1e10..cd995c0 100644
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index c5da908..2cb8031 100644
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diff --git a/docs/screenshots/design-lab/pr_shelf.png b/docs/screenshots/design-lab/pr_shelf.png
index 9b27718..7f5d1e3 100644
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diff --git a/docs/screenshots/design-lab/pr_symbols.png b/docs/screenshots/design-lab/pr_symbols.png
index b70f66a..472843a 100644
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