diff --git a/web/src/App.css b/web/src/App.css
index cdf4fb1..b692a8c 100644
--- a/web/src/App.css
+++ b/web/src/App.css
@@ -1,9 +1,13 @@
 .app {
-  min-height: 100vh;
+  --table-fr: 0.58fr;
+  --hand-fr: 0.42fr;
+  height: 100%;
+  min-height: 0;
   display: grid;
-  grid-template-rows: auto 1fr auto;
+  grid-template-rows: auto minmax(0, var(--table-fr)) minmax(0, var(--hand-fr));
   color: var(--ink-100);
   animation: page-in 0.6s ease both;
+  overflow: hidden;
 }
 
 .top-bar {
@@ -11,7 +15,7 @@
   gap: 24px;
   align-items: center;
   justify-content: space-between;
-  padding: 20px 32px;
+  padding: clamp(12px, 2vh, 20px) clamp(18px, 3vw, 32px);
   border-bottom: 1px solid rgba(255, 236, 209, 0.18);
   background: linear-gradient(90deg, rgba(30, 20, 12, 0.9), rgba(44, 28, 18, 0.7));
   backdrop-filter: blur(6px);
@@ -132,14 +136,18 @@
 .table {
   display: grid;
   grid-template-columns: minmax(160px, 220px) minmax(0, 1fr) minmax(220px, 280px);
-  gap: 20px;
-  padding: 20px 24px 30px;
+  gap: clamp(12px, 2vw, 20px);
+  padding: clamp(12px, 2vh, 18px) clamp(16px, 2.4vw, 24px) clamp(12px, 2.4vh, 22px);
+  min-height: 0;
+  align-items: stretch;
+  height: 100%;
 }
 
 .rail {
   display: flex;
   flex-direction: column;
   gap: 16px;
+  min-height: 0;
 }
 
 .rail.left {
@@ -151,8 +159,8 @@
 }
 
 .stack-card {
-  width: 140px;
-  height: 180px;
+  width: clamp(110px, 12vw, 140px);
+  height: clamp(150px, 18vh, 180px);
   border-radius: 18px;
   padding: 16px;
   display: flex;
@@ -194,10 +202,13 @@
 .table-surface {
   position: relative;
   border-radius: 28px;
-  padding: 26px 32px;
+  padding: clamp(14px, 2vh, 22px) clamp(18px, 2.4vw, 28px);
   background: linear-gradient(180deg, #b67c4d 0%, #c9935c 35%, #d7a36a 100%);
   box-shadow: inset 0 0 0 1px rgba(92, 55, 33, 0.4), var(--shadow-deep);
   overflow: hidden;
+  display: grid;
+  grid-template-rows: minmax(0, 1fr) auto minmax(0, 1fr);
+  min-height: 0;
 }
 
 .table-surface::before {
@@ -220,6 +231,7 @@
   display: grid;
   gap: 14px;
   z-index: 1;
+  min-height: 0;
 }
 
 .zone-label-row {
@@ -254,8 +266,8 @@
 }
 
 .center-zone {
-  margin: 20px 0;
-  padding: 16px;
+  margin: 12px 0;
+  padding: 12px;
   border-radius: 18px;
   background: rgba(44, 24, 14, 0.15);
   border: 1px solid rgba(44, 24, 14, 0.2);
@@ -302,11 +314,12 @@
   border-radius: 20px;
   padding: 16px;
   border: 1px solid rgba(255, 221, 181, 0.2);
-  min-height: 320px;
   display: flex;
   flex-direction: column;
   gap: 12px;
   box-shadow: var(--shadow-soft);
+  min-height: 0;
+  flex: 1;
 }
 
 .panel-header {
@@ -326,8 +339,9 @@
   font-size: 13px;
   color: var(--ink-70);
   line-height: 1.4;
-  max-height: 320px;
   overflow-y: auto;
+  flex: 1;
+  min-height: 0;
 }
 
 .history-panel ul ul {
@@ -349,11 +363,14 @@
 }
 
 .hand-area {
-  padding: 18px 24px 24px;
+  padding: clamp(12px, 2vh, 18px) clamp(16px, 2.4vw, 24px);
   background: linear-gradient(180deg, rgba(30, 20, 12, 0.85), rgba(18, 12, 8, 0.95));
   border-top: 1px solid rgba(255, 221, 181, 0.2);
   display: grid;
-  gap: 18px;
+  gap: 12px;
+  height: 100%;
+  overflow: hidden;
+  min-height: 0;
 }
 
 .action-prompt {
@@ -361,12 +378,12 @@
   justify-content: space-between;
   align-items: center;
   gap: 20px;
-  padding: 16px 20px;
+  padding: 12px 16px;
   border-radius: 18px;
   background: rgba(255, 221, 181, 0.12);
   border: 1px solid rgba(255, 221, 181, 0.2);
   width: 100%;
-  max-width: 960px;
+  max-width: 900px;
   margin: 0 auto;
 }
 
@@ -388,7 +405,9 @@
 .action-choice-row {
   display: flex;
   gap: 10px;
-  flex-wrap: wrap;
+  flex-wrap: nowrap;
+  overflow-x: auto;
+  padding-bottom: 4px;
 }
 
 .action-choice-row .selected-action {
@@ -401,12 +420,14 @@
   display: flex;
   gap: 12px;
   justify-content: center;
-  flex-wrap: wrap;
+  flex-wrap: nowrap;
+  overflow-x: auto;
+  padding-bottom: 6px;
 }
 
 .card-tile {
-  width: 110px;
-  height: 150px;
+  width: clamp(90px, 8.8vw, 110px);
+  height: clamp(120px, 12.5vh, 150px);
   border-radius: 16px;
   background: #f8f1e6;
   color: #22160f;
@@ -711,6 +732,11 @@ button:disabled {
 @media (max-width: 980px) {
   .table {
     grid-template-columns: 1fr;
+    grid-template-rows: auto minmax(0, 1fr) auto;
+  }
+
+  .table-surface {
+    height: 100%;
   }
 
   .rail.left,
@@ -725,17 +751,183 @@ button:disabled {
 }
 
 @media (max-width: 720px) {
+  .app {
+    --table-fr: 0.5fr;
+    --hand-fr: 0.5fr;
+  }
+
   .top-bar {
-    flex-direction: column;
-    align-items: flex-start;
+    padding: 10px 14px;
+    gap: 8px;
+    flex-wrap: wrap;
+    justify-content: flex-start;
+  }
+
+  .brand-mark {
+    font-size: 22px;
+  }
+
+  .brand-sub {
+    font-size: 10px;
+    letter-spacing: 1.4px;
+    display: none;
+  }
+
+  .scoreboard {
+    flex-wrap: nowrap;
+    gap: 6px;
+  }
+
+  .score-chip {
+    padding: 6px 10px;
+  }
+
+  .chip-label {
+    font-size: 9px;
+    letter-spacing: 1.2px;
+  }
+
+  .chip-score {
+    font-size: 12px;
+  }
+
+  .controls {
+    flex-wrap: nowrap;
+    justify-content: flex-start;
+    gap: 8px;
+    overflow-x: auto;
+    padding-bottom: 4px;
+  }
+
+  .ai-select {
+    padding: 4px 8px;
+    font-size: 10px;
+    flex: 0 0 auto;
+  }
+
+  .ai-select select {
+    padding: 4px 10px;
+    font-size: 10px;
+  }
+
+  button {
+    padding: 8px 12px;
+    font-size: 11px;
+    letter-spacing: 1.2px;
+  }
+
+  .table {
+    gap: 10px;
+    padding: 10px 12px 12px;
+  }
+
+  .rail.left,
+  .rail.right {
+    gap: 10px;
+  }
+
+  .stack-card {
+    width: min(46vw, 160px);
+    height: clamp(96px, 14vh, 120px);
+  }
+
+  .table-surface {
+    padding: 10px;
+    border-radius: 18px;
+  }
+
+  .zone {
+    gap: 10px;
+  }
+
+  .zone-label {
+    font-size: 10px;
+    letter-spacing: 1.4px;
+  }
+
+  .zone-chip {
+    padding: 4px 10px;
+    font-size: 10px;
+    letter-spacing: 1px;
+  }
+
+  .card-row {
+    flex-wrap: nowrap;
+    overflow-x: auto;
+    padding-bottom: 4px;
+    gap: 10px;
+  }
+
+  .center-zone {
+    margin: 8px 0;
+    padding: 8px;
+  }
+
+  .phase-pill {
+    font-size: 11px;
+  }
+
+  .hint {
+    font-size: 10px;
+    padding: 4px 8px;
+  }
+
+  .history-panel {
+    padding: 10px 12px;
+    border-radius: 14px;
+    max-height: none;
+  }
+
+  .history-panel ul {
+    display: none;
+  }
+
+  .hand-area {
+    gap: 6px;
+    padding: 8px 12px;
   }
 
   .action-prompt {
     flex-direction: column;
     align-items: flex-start;
+    padding: 8px 10px;
+    gap: 10px;
+  }
+
+  .action-buttons {
+    width: 100%;
+    justify-content: space-between;
   }
 
   .hand {
     justify-content: flex-start;
   }
+
+  .action-title {
+    font-size: 14px;
+  }
+
+  .action-sub {
+    font-size: 12px;
+  }
+
+  .action-choice-row,
+  .hand {
+    gap: 8px;
+    padding-bottom: 4px;
+  }
+
+  .card-tile {
+    width: 68px;
+    height: 96px;
+  }
+
+  .card-rank {
+    font-size: 16px;
+  }
+
+  .card-tag {
+    font-size: 9px;
+    letter-spacing: 1.2px;
+  }
 }
diff --git a/web/src/index.css b/web/src/index.css
index bede5a0..005debc 100644
--- a/web/src/index.css
+++ b/web/src/index.css
@@ -15,16 +15,26 @@
   box-sizing: border-box;
 }
 
+html,
+body {
+  height: 100%;
+  overflow: hidden;
+}
+
 body {
   margin: 0;
   font-family: var(--font-body);
   background: radial-gradient(circle at top, #2a1a0f, #130b07);
   color: var(--ink-100);
   min-height: 100vh;
+  height: 100vh;
+  height: 100svh;
+  overflow: hidden;
 }
 
 #root {
-  min-height: 100vh;
+  min-height: 0;
+  height: 100%;
 }
 
 a {
diff --git a/web/tests/e2e/app.spec.ts b/web/tests/e2e/app.spec.ts
index afe56c8..adf4511 100644
--- a/web/tests/e2e/app.spec.ts
+++ b/web/tests/e2e/app.spec.ts
@@ -335,6 +335,207 @@ test('visual snapshot', async ({ page }) => {
   })
 })
 
+test('mobile layout fits in one viewport', async ({ page }) => {
+  await page.setViewportSize({ width: 390, height: 844 })
+  await page.emulateMedia({ reducedMotion: 'reduce' })
+
+  await page.route('**/api/sessions', async (route) => {
+    const payload = {
+      session_id: 'mobile-session',
+      state: {
+        hands: [
+          [
+            {
+              id: 'card-1',
+              suit: 'SPADES',
+              rank: 'ACE',
+              display: 'Ace of Spades',
+              played_by: null,
+              purpose: null,
+              point_value: 1,
+              is_stolen: false,
+              attachments: [],
+            },
+          ],
+          [],
+        ],
+        hand_counts: [1, 0],
+        fields: [[], []],
+        effective_fields: [[], []],
+        deck_count: 19,
+        discard_pile: [],
+        discard_count: 0,
+        scores: [0, 0],
+        targets: [21, 21],
+        turn: 0,
+        current_action_player: 0,
+        status: null,
+        resolving_two: false,
+        resolving_one_off: false,
+        resolving_three: false,
+        overall_turn: 0,
+        use_ai: true,
+        one_off_card_to_counter: null,
+      },
+      legal_actions: [
+        {
+          id: 0,
+          label: 'Play Ace of Spades as points',
+          type: 'Points',
+          played_by: 0,
+          source: 'Hand',
+          requires_additional_input: false,
+          card: {
+            id: 'card-1',
+            suit: 'SPADES',
+            rank: 'ACE',
+            display: 'Ace of Spades',
+            played_by: null,
+            purpose: null,
+            point_value: 1,
+            is_stolen: false,
+            attachments: [],
+          },
+          target: null,
+        },
+        {
+          id: 1,
+          label: 'Draw a card from deck',
+          type: 'Draw',
+          played_by: 0,
+          source: 'Deck',
+          requires_additional_input: false,
+          card: null,
+          target: null,
+        },
+      ],
+      state_version: 0,
+      ai_thinking: false,
+    }
+
+    await route.fulfill({ json: payload })
+  })
+
+  await page.route('**/api/sessions/mobile-session/history', async (route) => {
+    const entries = Array.from({ length: 6 }, (_, index) => ({
+      timestamp: `2025-01-01T00:00:${index.toString().padStart(2, '0')}Z`,
+      turn_number: 1,
+      player: index % 2,
+      action_type: 'Draw',
+      description: `History entry ${index + 1}`,
+    }))
+
+    await route.fulfill({ json: { entries, turn_counter: 1 } })
+  })
+
+  await page.route('**/api/sessions/mobile-session', async (route) => {
+    const payload = {
+      session_id: 'mobile-session',
+      state: {
+        hands: [
+          [
+            {
+              id: 'card-1',
+              suit: 'SPADES',
+              rank: 'ACE',
+              display: 'Ace of Spades',
+              played_by: null,
+              purpose: null,
+              point_value: 1,
+              is_stolen: false,
+              attachments: [],
+            },
+          ],
+          [],
+        ],
+        hand_counts: [1, 0],
+        fields: [[], []],
+        effective_fields: [[], []],
+        deck_count: 19,
+        discard_pile: [],
+        discard_count: 0,
+        scores: [0, 0],
+        targets: [21, 21],
+        turn: 0,
+        current_action_player: 0,
+        status: null,
+        resolving_two: false,
+        resolving_one_off: false,
+        resolving_three: false,
+        overall_turn: 0,
+        use_ai: true,
+        one_off_card_to_counter: null,
+      },
+      legal_actions: [
+        {
+          id: 0,
+          label: 'Play Ace of Spades as points',
+          type: 'Points',
+          played_by: 0,
+          source: 'Hand',
+          requires_additional_input: false,
+          card: {
+            id: 'card-1',
+            suit: 'SPADES',
+            rank: 'ACE',
+            display: 'Ace of Spades',
+            played_by: null,
+            purpose: null,
+            point_value: 1,
+            is_stolen: false,
+            attachments: [],
+          },
+          target: null,
+        },
+        {
+          id: 1,
+          label: 'Draw a card from deck',
+          type: 'Draw',
+          played_by: 0,
+          source: 'Deck',
+          requires_additional_input: false,
+          card: null,
+          target: null,
+        },
+      ],
+      state_version: 0,
+      ai_thinking: false,
+    }
+
+    await route.fulfill({ json: payload })
+  })
+
+  await page.goto('/')
+  await expect(page.getByText('Cuttle')).toBeVisible()
+
+  const viewportHeight = await page.evaluate(() => window.innerHeight)
+
+  const sections = [
+    page.locator('.top-bar'),
+    page.locator('.rail.left'),
+    page.locator('.table-surface'),
+    page.locator('.rail.right'),
+    page.locator('.hand-area'),
+  ]
+
+  for (const section of sections) {
+    const box = await section.boundingBox()
+    expect(box).not.toBeNull()
+    if (!box) continue
+    expect(box.y).toBeGreaterThanOrEqual(0)
+    expect(box.y + box.height).toBeLessThanOrEqual(viewportHeight + 2)
+  }
+
+  const fitsViewport = await page.evaluate(
+    () => document.documentElement.scrollHeight <= window.innerHeight + 2,
+  )
+  expect(fitsViewport).toBeTruthy()
+
+  expect(await page.screenshot()).toMatchSnapshot('table-layout-mobile.png', {
+    maxDiffPixelRatio: 0.02,
+  })
+})
+
 test('one-off modal flow', async ({ page }) => {
   await page.route('**/api/sessions', async (route) => {
     const payload = {
diff --git a/web/tests/snapshots/app.spec.ts-snapshots/table-layout-desktop-darwin.png b/web/tests/snapshots/app.spec.ts-snapshots/table-layout-desktop-darwin.png
index 2871607..fb931a0 100644
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diff --git a/web/tests/snapshots/app.spec.ts-snapshots/table-layout-mobile-darwin.png b/web/tests/snapshots/app.spec.ts-snapshots/table-layout-mobile-darwin.png
index fc721c2..7e250e0 100644
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diff --git a/web/tests/snapshots/app.spec.ts-snapshots/table-layout-mobile-desktop-darwin.png b/web/tests/snapshots/app.spec.ts-snapshots/table-layout-mobile-desktop-darwin.png
new file mode 100644
index 0000000..5bf1d61
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diff --git a/web/tests/snapshots/app.spec.ts-snapshots/table-layout-mobile-mobile-darwin.png b/web/tests/snapshots/app.spec.ts-snapshots/table-layout-mobile-mobile-darwin.png
new file mode 100644
index 0000000..5bf1d61
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