diff --git a/README.md b/README.md
index 40ddc24..ec69a61 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,7 @@
   - 第一分開始後，`設定隊伍` 會改成 `上一步`。
   - `比賽結算` 需要長按 `1` 秒才會觸發，避免誤觸。
   - 達標分數後有獲勝動畫與結算流程。
+  - 手機上會盡量壓縮成單頁滿版，避免上下滑動。
 - 羽球規則
   - 預設 `21` 分制，可在設定隊伍時調整目標分數。
   - 支援 Deuce：`20:20` 後需領先 `2` 分才獲勝。
@@ -76,6 +77,13 @@ npm run lint
 npm run build
 ```
 
+## 記分板滿版模式
+
+- 記分板頁面會套用 `100dvh` 高度。
+- 手機進入記分板時會關閉頁面捲動與 overscroll。
+- `viewport` 已加上 `viewport-fit=cover`，較能貼合 iPhone / iPad 安全區。
+- 若手機高度較矮，會再縮小字級、按鈕與分數區，盡量維持整頁顯示。
+
 ## 環境變數
 
 請先建立 `.env`：
diff --git a/index.html b/index.html
index 5dae752..ce33792 100644
--- a/index.html
+++ b/index.html
@@ -5,7 +5,7 @@
     <link rel="icon" type="image/png" sizes="64x64" href="/favicon.png" />
     <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
     <link rel="manifest" href="/manifest.webmanifest" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover" />
     <meta name="theme-color" content="#143f49" />
     <meta
       name="description"
diff --git a/src/App.css b/src/App.css
index a692b33..dda0cd5 100644
--- a/src/App.css
+++ b/src/App.css
@@ -9,6 +9,13 @@
   padding-top: 16px;
 }
 
+.app-shell-scoreboard-fit {
+  min-height: 100dvh;
+  display: grid;
+  grid-template-rows: auto minmax(0, 1fr);
+  padding-bottom: max(12px, env(safe-area-inset-bottom));
+}
+
 .topbar {
   display: flex;
   justify-content: space-between;
@@ -487,6 +494,8 @@
   grid-template-columns: minmax(0, 1fr) 160px;
   gap: 14px;
   align-items: start;
+  min-height: 0;
+  height: 100%;
 }
 
 .streak-banner {
@@ -625,6 +634,7 @@
 .scoreboard-court {
   display: grid;
   gap: 14px;
+  min-height: 0;
   padding: 12px;
   border-radius: 22px;
   background:
@@ -1782,6 +1792,12 @@
     padding-top: 10px;
   }
 
+  .app-shell-scoreboard-fit {
+    min-height: 100dvh;
+    padding-top: max(8px, env(safe-area-inset-top));
+    padding-bottom: max(8px, env(safe-area-inset-bottom));
+  }
+
   .panel {
     padding: 16px;
     border-radius: 18px;
@@ -1850,6 +1866,31 @@
     border-radius: 16px;
   }
 
+  .app-shell-scoreboard-fit .topbar-compact {
+    gap: 6px;
+    margin-bottom: 6px;
+  }
+
+  .app-shell-scoreboard-fit .eyebrow {
+    margin-bottom: 6px;
+    padding: 6px 10px;
+    font-size: 0.66rem;
+  }
+
+  .app-shell-scoreboard-fit .branding h1 {
+    margin: 8px 0 6px;
+    font-size: 1.12rem;
+  }
+
+  .app-shell-scoreboard-fit .topnav {
+    gap: 6px;
+  }
+
+  .app-shell-scoreboard-fit .nav-pill {
+    padding: 7px 10px;
+    font-size: 0.82rem;
+  }
+
   .streak-banner {
     top: 12%;
     min-width: min(92vw, 360px);
@@ -1888,19 +1929,19 @@
 
   .scoreboard-team-head {
     grid-template-columns: minmax(0, 1fr) 54px;
-    gap: 6px;
+    gap: 5px;
   }
 
   .team-head-main {
-    gap: 6px;
-    min-height: 52px;
-    padding: 6px;
+    gap: 5px;
+    min-height: 46px;
+    padding: 5px;
   }
 
   .scoreboard-name-chip {
-    gap: 6px;
-    min-height: 38px;
-    padding: 4px 6px;
+    gap: 5px;
+    min-height: 34px;
+    padding: 3px 5px;
   }
 
   .serve-lane-arrow {
@@ -1908,87 +1949,87 @@
   }
 
   .team-number {
-    width: 28px;
-    height: 28px;
-    flex-basis: 28px;
-    font-size: 0.9rem;
+    width: 24px;
+    height: 24px;
+    flex-basis: 24px;
+    font-size: 0.82rem;
   }
 
   .scoreboard-name-chip strong {
-    font-size: clamp(0.82rem, 4vw, 1.1rem);
+    font-size: clamp(0.76rem, 3.6vw, 1rem);
   }
 
   .team-icon-button {
-    min-height: 32px;
-    font-size: 1rem;
+    min-height: 30px;
+    font-size: 0.94rem;
   }
 
   .serve-lane {
     grid-template-columns: 28px auto;
-    min-height: 38px;
-    padding: 6px 8px;
-    font-size: 0.92rem;
+    min-height: 34px;
+    padding: 4px 6px;
+    font-size: 0.86rem;
   }
 
   .serve-lane small {
     grid-column: 1 / -1;
     justify-self: start;
-    font-size: 0.78rem;
+    font-size: 0.72rem;
   }
 
   .score-panel-surface {
-    min-height: 112px;
+    min-height: clamp(90px, 15.5dvh, 104px);
   }
 
   .score-panel-value {
-    font-size: clamp(3.5rem, 18vw, 5.4rem);
+    font-size: clamp(3rem, 15vw, 4.6rem);
   }
 
   .scoreboard-center-banner {
-    gap: 4px;
+    gap: 2px;
   }
 
   .scoreboard-center-banner p {
-    font-size: 1.25rem;
+    font-size: 1.02rem;
   }
 
   .scoreboard-center-banner small {
-    font-size: 0.78rem;
+    font-size: 0.7rem;
     text-align: center;
   }
 
   .scoreboard-rail {
-    grid-template-columns: minmax(0, 1fr) 108px 118px;
-    gap: 8px;
-  }
-
-  .rail-square-button {
-    min-height: 42px;
-    font-size: 0.95rem;
-  }
-
-  .rail-clock {
-    min-height: 42px;
-    border-radius: 10px;
-    font-size: 1.1rem;
-  }
-
-  .rail-room-id {
-    padding: 8px 10px;
-    font-size: 0.86rem;
-  }
-
-  .rail-pill {
-    padding: 10px 8px;
-    font-size: 0.92rem;
-  }
-
-  .rail-pill-hold-wrap {
+    grid-template-columns: minmax(0, 1fr) 94px 106px;
     gap: 6px;
   }
 
+  .rail-square-button {
+    min-height: 38px;
+    font-size: 0.84rem;
+  }
+
+  .rail-clock {
+    min-height: 38px;
+    border-radius: 10px;
+    font-size: 0.96rem;
+  }
+
+  .rail-room-id {
+    padding: 7px 8px;
+    font-size: 0.76rem;
+  }
+
+  .rail-pill {
+    padding: 8px 7px;
+    font-size: 0.82rem;
+  }
+
+  .rail-pill-hold-wrap {
+    gap: 4px;
+  }
+
   .rail-hold-progress {
-    height: 6px;
+    height: 5px;
   }
 
   .finish-dialog {
@@ -2171,6 +2212,33 @@
   }
 }
 
+@media (max-width: 720px) and (max-height: 840px) {
+  .app-shell-scoreboard-fit .scoreboard-screen {
+    gap: 5px;
+  }
+
+  .app-shell-scoreboard-fit .scoreboard-court {
+    gap: 8px;
+    padding: 6px;
+  }
+
+  .app-shell-scoreboard-fit .scoreboard-team-section {
+    gap: 5px;
+  }
+
+  .app-shell-scoreboard-fit .score-panel-surface {
+    min-height: clamp(82px, 14.2dvh, 96px);
+  }
+
+  .app-shell-scoreboard-fit .score-panel-value {
+    font-size: clamp(2.7rem, 13.5vw, 4.1rem);
+  }
+
+  .app-shell-scoreboard-fit .scoreboard-center-banner p {
+    font-size: 0.96rem;
+  }
+}
+
 .room-list-grid {
   display: grid;
   gap: 16px;
diff --git a/src/App.tsx b/src/App.tsx
index 27c0d8d..2e8c04c 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -219,6 +219,14 @@ function App() {
     return () => window.clearTimeout(timer)
   }, [navigationLockMessage])
 
+  useEffect(() => {
+    document.body.classList.toggle('body-scoreboard', isScoreboardRoute)
+
+    return () => {
+      document.body.classList.remove('body-scoreboard')
+    }
+  }, [isScoreboardRoute])
+
   useEffect(() => {
     const handlePwaUpdateReady = () => {
       setPwaUpdateReady(true)
@@ -908,7 +916,7 @@ function App() {
   }
 
   return (
-    <div className={isScoreboardRoute ? 'app-shell app-shell-scoreboard' : 'app-shell'}>
+    <div className={isScoreboardRoute ? 'app-shell app-shell-scoreboard app-shell-scoreboard-fit' : 'app-shell'}>
       <header className={isScoreboardRoute ? 'topbar topbar-compact' : 'topbar'}>
         <div className="branding">
           <p className="eyebrow">Badminton Scoreboard</p>
diff --git a/src/index.css b/src/index.css
index be06b3e..a6356dc 100644
--- a/src/index.css
+++ b/src/index.css
@@ -37,6 +37,11 @@ body {
     linear-gradient(180deg, var(--page-bg), var(--page-bg-2));
 }
 
+body.body-scoreboard {
+  overflow: hidden;
+  overscroll-behavior: none;
+}
+
 body::before {
   content: '';
   position: fixed;
@@ -53,6 +58,11 @@ body::before {
   min-height: 100vh;
 }
 
+body.body-scoreboard #root {
+  min-height: 100dvh;
+  overflow: hidden;
+}
+
 input,
 textarea,
 select,