diff --git a/client/app.js b/client/app.js
index 3a6212a..67b97ff 100644
--- a/client/app.js
+++ b/client/app.js
@@ -66,10 +66,14 @@ class GolfGame {
         this.discardHistory = [];
         this.maxDiscardHistory = 5;
 
+        // Mobile detection
+        this.isMobile = false;
+
         this.initElements();
         this.initAudio();
         this.initCardTooltips();
         this.bindEvents();
+        this.initMobileDetection();
         this.checkUrlParams();
     }
 
@@ -85,6 +89,51 @@ class GolfGame {
         }
     }
 
+    initMobileDetection() {
+        const mql = window.matchMedia('(max-width: 500px) and (orientation: portrait)');
+        const update = (e) => {
+            this.isMobile = e.matches;
+            document.body.classList.toggle('mobile-portrait', e.matches);
+            // Close any open drawers on layout change
+            if (!e.matches) {
+                this.closeDrawers();
+            }
+        };
+        mql.addEventListener('change', update);
+        update(mql);
+
+        // Bottom bar drawer toggles
+        const bottomBar = document.getElementById('mobile-bottom-bar');
+        const backdrop = document.getElementById('drawer-backdrop');
+        if (bottomBar) {
+            bottomBar.addEventListener('click', (e) => {
+                const btn = e.target.closest('.mobile-bar-btn');
+                if (!btn) return;
+                const drawerId = btn.dataset.drawer;
+                const panel = document.getElementById(drawerId);
+                if (!panel) return;
+
+                const isOpen = panel.classList.contains('drawer-open');
+                this.closeDrawers();
+                if (!isOpen) {
+                    panel.classList.add('drawer-open');
+                    btn.classList.add('active');
+                    if (backdrop) backdrop.classList.add('visible');
+                }
+            });
+        }
+        if (backdrop) {
+            backdrop.addEventListener('click', () => this.closeDrawers());
+        }
+    }
+
+    closeDrawers() {
+        document.querySelectorAll('.side-panel.drawer-open').forEach(p => p.classList.remove('drawer-open'));
+        document.querySelectorAll('.mobile-bar-btn.active').forEach(b => b.classList.remove('active'));
+        const backdrop = document.getElementById('drawer-backdrop');
+        if (backdrop) backdrop.classList.remove('visible');
+    }
+
     initAudio() {
         // Initialize audio context on first user interaction
         const initCtx = () => {
@@ -1876,20 +1925,33 @@ class GolfGame {
         this.dealAnimationInProgress = true;
 
         if (window.cardAnimations) {
-            window.cardAnimations.animateDealing(
-                this.gameState,
-                (playerId, cardIdx) => this.getCardSlotRect(playerId, cardIdx),
-                () => {
-                    // Deal complete - allow flip prompts
-                    this.dealAnimationInProgress = false;
-                    // Show real cards
-                    this.playerCards.style.visibility = 'visible';
-                    this.opponentsRow.style.visibility = 'visible';
-                    this.renderGame();
-                    // Stagger opponent initial flips right after dealing
-                    this.animateOpponentInitialFlips();
-                }
-            );
+            // Use double-rAF to ensure layout is fully computed after renderGame().
+            // First rAF: browser computes styles. Second rAF: layout is painted.
+            // This is critical on mobile where CSS !important rules need to apply
+            // before getBoundingClientRect() returns correct card slot positions.
+            requestAnimationFrame(() => {
+                requestAnimationFrame(() => {
+                    // Verify rects are valid before starting animation
+                    const testRect = this.getCardSlotRect(this.playerId, 0);
+                    if (this.isMobile) {
+                        console.log('[DEAL] Starting deal animation, test rect:', testRect);
+                    }
+                    window.cardAnimations.animateDealing(
+                        this.gameState,
+                        (playerId, cardIdx) => this.getCardSlotRect(playerId, cardIdx),
+                        () => {
+                            // Deal complete - allow flip prompts
+                            this.dealAnimationInProgress = false;
+                            // Show real cards
+                            this.playerCards.style.visibility = 'visible';
+                            this.opponentsRow.style.visibility = 'visible';
+                            this.renderGame();
+                            // Stagger opponent initial flips right after dealing
+                            this.animateOpponentInitialFlips();
+                        }
+                    );
+                });
+            });
         } else {
             // Fallback
             this.dealAnimationInProgress = false;
@@ -1950,14 +2012,22 @@ class GolfGame {
     getCardSlotRect(playerId, cardIdx) {
         if (playerId === this.playerId) {
             const cards = this.playerCards.querySelectorAll('.card');
-            return cards[cardIdx]?.getBoundingClientRect() || null;
+            const rect = cards[cardIdx]?.getBoundingClientRect() || null;
+            if (this.isMobile && rect) {
+                console.log(`[DEAL-DEBUG] Player card[${cardIdx}] rect:`, {l: rect.left, t: rect.top, w: rect.width, h: rect.height});
+            }
+            return rect;
         } else {
             const area = this.opponentsRow.querySelector(
                 `.opponent-area[data-player-id="${playerId}"]`
             );
             if (area) {
                 const cards = area.querySelectorAll('.card');
-                return cards[cardIdx]?.getBoundingClientRect() || null;
+                const rect = cards[cardIdx]?.getBoundingClientRect() || null;
+                if (this.isMobile && rect) {
+                    console.log(`[DEAL-DEBUG] Opponent ${playerId} card[${cardIdx}] rect:`, {l: rect.left, t: rect.top, w: rect.width, h: rect.height});
+                }
+                return rect;
             }
         }
         return null;
@@ -2932,6 +3002,11 @@ class GolfGame {
         }
         screen.classList.add('active');
 
+        // Close mobile drawers on screen change
+        if (this.isMobile) {
+            this.closeDrawers();
+        }
+
         // Handle auth bar visibility - hide global bar during game, show in-game controls instead
         const isGameScreen = screen === this.gameScreen;
         const user = this.auth?.user;
@@ -3444,6 +3519,10 @@ class GolfGame {
         this.heldCardFloating.style.top = `${cardTop}px`;
         this.heldCardFloating.style.width = `${cardWidth}px`;
         this.heldCardFloating.style.height = `${cardHeight}px`;
+        // Scale font to card width (matches cardAnimations.cardFontSize ratio)
+        if (this.isMobile) {
+            this.heldCardFloating.style.fontSize = `${cardWidth * 0.35}px`;
+        }
 
         // Position discard button attached to right side of held card
         const buttonLeft = cardLeft + cardWidth; // Right edge of card (no gap)
@@ -3503,6 +3582,9 @@ class GolfGame {
         this.heldCardFloating.style.top = `${cardTop}px`;
         this.heldCardFloating.style.width = `${cardWidth}px`;
         this.heldCardFloating.style.height = `${cardHeight}px`;
+        if (this.isMobile) {
+            this.heldCardFloating.style.fontSize = `${cardWidth * 0.35}px`;
+        }
 
         this.heldCardFloatingContent.innerHTML = '';
         this.heldCardFloating.classList.remove('hidden');
@@ -3648,6 +3730,7 @@ class GolfGame {
 
     renderGame() {
         if (!this.gameState) return;
+        if (this.dealAnimationInProgress) return;
 
         // Update CPU considering visual state
         this.updateCpuConsideringState();
diff --git a/client/card-animations.js b/client/card-animations.js
index fd8b97a..ad00d0d 100644
--- a/client/card-animations.js
+++ b/client/card-animations.js
@@ -75,6 +75,13 @@ class CardAnimations {
         return easings[type] || 'easeOutQuad';
     }
 
+    // Font size proportional to card width — consistent across all card types.
+    // Mobile uses a tighter ratio since cards are smaller and closer together.
+    cardFontSize(width) {
+        const ratio = document.body.classList.contains('mobile-portrait') ? 0.35 : 0.5;
+        return (width * ratio) + 'px';
+    }
+
     // Create animated card element with 3D flip structure
     createAnimCard(rect, showBack = false, deckColor = null) {
         const card = document.createElement('div');
@@ -94,7 +101,7 @@ class CardAnimations {
             card.style.height = rect.height + 'px';
             // Scale font-size proportionally to card width
             const front = card.querySelector('.draw-anim-front');
-            if (front) front.style.fontSize = (rect.width * 0.5) + 'px';
+            if (front) front.style.fontSize = this.cardFontSize(rect.width);
         }
 
         // Apply deck color to back
@@ -1180,7 +1187,7 @@ class CardAnimations {
             if (handFront) {
                 timeline.add({
                     targets: handFront,
-                    fontSize: (discardRect.width * 0.5) + 'px',
+                    fontSize: this.cardFontSize(discardRect.width),
                     duration: T.arc,
                     easing: this.getEasing('arc'),
                 }, `-=${T.arc}`);
@@ -1205,7 +1212,7 @@ class CardAnimations {
             if (heldFront) {
                 timeline.add({
                     targets: heldFront,
-                    fontSize: (handRect.width * 0.5) + 'px',
+                    fontSize: this.cardFontSize(handRect.width),
                     duration: T.arc,
                     easing: this.getEasing('arc'),
                 }, `-=${T.arc}`);
@@ -1424,7 +1431,7 @@ class CardAnimations {
         card.style.height = rect.height + 'px';
         // Scale font-size proportionally to card width
         const front = card.querySelector('.draw-anim-front');
-        if (front) front.style.fontSize = (rect.width * 0.5) + 'px';
+        if (front) front.style.fontSize = this.cardFontSize(rect.width);
 
         if (rotation) {
             card.style.transform = `rotate(${rotation}deg)`;
diff --git a/client/card-manager.js b/client/card-manager.js
index acfbb81..785f201 100644
--- a/client/card-manager.js
+++ b/client/card-manager.js
@@ -126,6 +126,13 @@ class CardManager {
         cardEl.style.width = `${rect.width}px`;
         cardEl.style.height = `${rect.height}px`;
 
+        // On mobile, scale font proportional to card width so rank/suit fit
+        if (document.body.classList.contains('mobile-portrait')) {
+            cardEl.style.fontSize = `${rect.width * 0.35}px`;
+        } else {
+            cardEl.style.fontSize = '';
+        }
+
         if (animate) {
             const moveDuration = window.TIMING?.card?.moving || 350;
             setTimeout(() => cardEl.classList.remove('moving'), moveDuration);
diff --git a/client/index.html b/client/index.html
index 68cfce4..402df87 100644
--- a/client/index.html
+++ b/client/index.html
@@ -2,7 +2,7 @@
 <html lang="en">
 <head>
     <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
     <title>Golf Card Game</title>
     <link rel="stylesheet" href="style.css">
 </head>
@@ -398,6 +398,15 @@
                     </table>
                 </div>
             </div>
+
+            <!-- Mobile bottom bar (hidden on desktop) -->
+            <div id="mobile-bottom-bar">
+                <button class="mobile-bar-btn" data-drawer="standings-panel">Standings</button>
+                <button class="mobile-bar-btn" data-drawer="scoreboard">Scores</button>
+            </div>
+
+            <!-- Drawer backdrop for mobile -->
+            <div id="drawer-backdrop" class="drawer-backdrop"></div>
         </div>
 
         <!-- Rules Screen -->
diff --git a/client/style.css b/client/style.css
index 638a2e5..03d7720 100644
--- a/client/style.css
+++ b/client/style.css
@@ -4877,3 +4877,471 @@ body.screen-shake {
     border-radius: 6px;
     box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
 }
+
+/* ============================================
+   MOBILE PORTRAIT LAYOUT
+   ============================================
+   All rules scoped under body.mobile-portrait.
+   Triggered by JS matchMedia on narrow portrait screens.
+   Desktop layout is completely untouched.
+   ============================================ */
+
+/* Mobile bottom bar - hidden on desktop */
+#mobile-bottom-bar {
+    display: none;
+}
+
+body.mobile-portrait {
+    height: 100dvh;
+    overflow: hidden;
+    overscroll-behavior: contain;
+    touch-action: manipulation;
+}
+
+body.mobile-portrait #app {
+    padding: 0;
+    height: 100dvh;
+    overflow: hidden;
+}
+
+/* --- Mobile: Game screen fills viewport --- */
+/* IMPORTANT: Must include .active to avoid overriding .screen { display: none } */
+body.mobile-portrait #game-screen.active {
+    height: 100dvh;
+    overflow: hidden;
+    margin-left: 0;
+    width: 100%;
+    display: flex;
+    flex-direction: column;
+}
+
+body.mobile-portrait .game-layout {
+    flex: 1;
+    flex-direction: column;
+    overflow: hidden;
+    min-height: 0;
+}
+
+body.mobile-portrait .game-main {
+    flex: 1;
+    gap: 0;
+    justify-content: flex-start;
+    overflow: hidden;
+    min-height: 0;
+}
+
+/* --- Mobile: Compact header (single row) --- */
+body.mobile-portrait .game-header {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    padding: 4px 10px;
+    padding-top: calc(4px + env(safe-area-inset-top, 0px));
+    font-size: 0.8rem;
+    min-height: 36px;
+    width: 100%;
+    margin-left: 0;
+    gap: 6px;
+}
+
+body.mobile-portrait .header-col-left {
+    flex: 0 0 auto;
+    gap: 6px;
+}
+
+body.mobile-portrait .header-col-center {
+    flex: 1;
+    min-width: 0;
+}
+
+body.mobile-portrait .header-col-right {
+    flex: 0 0 auto;
+    gap: 4px;
+}
+
+/* Hide non-essential header items on mobile */
+body.mobile-portrait .active-rules-bar,
+body.mobile-portrait .game-username,
+body.mobile-portrait #game-logout-btn {
+    display: none !important;
+}
+
+body.mobile-portrait .status-message {
+    font-size: 0.8rem;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+body.mobile-portrait .round-info {
+    font-size: 0.8rem;
+}
+
+body.mobile-portrait #leave-game-btn {
+    padding: 2px 6px;
+    font-size: 0.65rem;
+}
+
+body.mobile-portrait .mute-btn {
+    font-size: 0.9rem;
+    padding: 2px;
+}
+
+body.mobile-portrait .final-turn-badge {
+    font-size: 0.7rem;
+    padding: 2px 8px;
+}
+
+/* --- Mobile: Game table — opponents pinned top, rest centered in remaining space --- */
+body.mobile-portrait .game-table {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: flex-start;
+    gap: 0 !important;
+    flex: 1;
+    overflow: hidden;
+    padding: 0 4px;
+    min-height: 0;
+}
+
+/* --- Mobile: Opponents as flat horizontal strip, pinned to top --- */
+body.mobile-portrait .opponents-row {
+    display: flex;
+    flex-wrap: nowrap;
+    justify-content: center;
+    align-items: flex-start;
+    gap: 6px;
+    min-height: 0 !important;
+    padding: 2px 8px;
+    overflow-x: auto;
+    overflow-y: hidden;
+    -webkit-overflow-scrolling: touch;
+    flex-shrink: 0;
+}
+
+/* --- Mobile: Player row gets remaining space, centered vertically --- */
+body.mobile-portrait .player-row {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 6px;
+    width: 100%;
+    flex: 1;
+    min-height: 0;
+}
+
+/* Remove all arch rotation and margin on mobile */
+body.mobile-portrait .opponents-row .opponent-area {
+    margin-bottom: 0 !important;
+    transform: none !important;
+    flex-shrink: 0;
+}
+
+body.mobile-portrait .opponent-area {
+    padding: 3px 5px 4px;
+    border-radius: 6px;
+    min-width: 0;
+}
+
+body.mobile-portrait .opponent-area h4 {
+    font-size: 0.6rem;
+    margin: 0 0 2px 0;
+    padding: 2px 4px;
+    max-width: 110px;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+body.mobile-portrait .opponent-area .card-grid {
+    grid-template-columns: repeat(3, 32px) !important;
+    gap: 2px !important;
+}
+
+body.mobile-portrait .opponent-area .card {
+    width: 32px !important;
+    height: 45px !important;
+    font-size: 0.6rem !important;
+    border-radius: 3px;
+}
+
+body.mobile-portrait .opponent-showing {
+    font-size: 0.55rem;
+    padding: 0px 3px;
+    margin-left: 3px;
+}
+
+/* --- Mobile: Deck/Discard area centered --- */
+body.mobile-portrait .table-center {
+    padding: 5px 10px;
+    border-radius: 8px;
+}
+
+body.mobile-portrait .deck-area {
+    gap: 10px;
+    align-items: flex-start;
+}
+
+body.mobile-portrait .deck-area > .card,
+body.mobile-portrait #deck,
+body.mobile-portrait #discard {
+    width: 60px !important;
+    height: 84px !important;
+    font-size: 1.3rem !important;
+}
+
+/* Held card floating should NOT be constrained to deck/discard size */
+body.mobile-portrait .held-card-floating {
+    width: 72px !important;
+    height: 101px !important;
+}
+
+body.mobile-portrait .discard-stack {
+    gap: 6px;
+}
+
+/* Discard button - horizontal on mobile instead of vertical tab */
+body.mobile-portrait #discard-btn {
+    position: fixed;
+    writing-mode: horizontal-tb;
+    text-orientation: initial;
+    padding: 8px 16px;
+    font-size: 0.8rem;
+    border-radius: 8px;
+}
+
+/* --- Mobile: Player cards — explicit sizes for reliable layout --- */
+body.mobile-portrait .player-section {
+    width: auto;
+    padding: 0;
+}
+
+body.mobile-portrait .player-area {
+    padding: 5px 8px;
+    border-radius: 8px;
+    width: auto;
+    display: inline-block;
+}
+
+body.mobile-portrait .player-area h4 {
+    font-size: 0.8rem;
+    padding: 3px 8px;
+    margin-bottom: 4px;
+}
+
+body.mobile-portrait .player-showing {
+    font-size: 0.75rem;
+}
+
+/* Player hand: fixed-size cards */
+body.mobile-portrait .player-section .card-grid {
+    grid-template-columns: repeat(3, 72px) !important;
+    gap: 5px !important;
+    justify-content: center;
+}
+
+body.mobile-portrait .player-section .card {
+    width: 72px !important;
+    height: 101px !important;
+    font-size: 1.5rem !important;
+}
+
+/* Real cards: font-size is now set inline by card-manager.js (proportional to card width).
+   Override the desktop clamp values to inherit from the element. */
+body.mobile-portrait .real-card .card-face-front,
+body.mobile-portrait .real-card .card-face-back {
+    font-size: inherit;
+    line-height: 1;
+}
+
+/* --- Mobile: Side panels become bottom drawers --- */
+body.mobile-portrait .side-panel {
+    position: fixed;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    width: 100%;
+    max-height: 55vh;
+    border-radius: 16px 16px 0 0;
+    padding: 12px 16px;
+    padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
+    z-index: 600;
+    transform: translateY(100%);
+    transition: transform 0.3s ease-out;
+    overflow-y: auto;
+    -webkit-overflow-scrolling: touch;
+}
+
+body.mobile-portrait .side-panel.left-panel,
+body.mobile-portrait .side-panel.right-panel {
+    left: 0;
+    right: 0;
+}
+
+body.mobile-portrait .side-panel.drawer-open {
+    transform: translateY(0);
+}
+
+/* Drawer handle */
+body.mobile-portrait .side-panel::before {
+    content: '';
+    display: block;
+    width: 40px;
+    height: 4px;
+    background: rgba(255, 255, 255, 0.3);
+    border-radius: 2px;
+    margin: 0 auto 10px;
+}
+
+/* Drawer backdrop */
+body.mobile-portrait .drawer-backdrop {
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: rgba(0, 0, 0, 0.5);
+    z-index: 599;
+    opacity: 0;
+    pointer-events: none;
+    transition: opacity 0.3s ease-out;
+}
+
+body.mobile-portrait .drawer-backdrop.visible {
+    opacity: 1;
+    pointer-events: auto;
+}
+
+/* Score table in drawer: full width */
+body.mobile-portrait .side-panel table {
+    width: 100%;
+    font-size: 0.85rem;
+}
+
+body.mobile-portrait .side-panel th,
+body.mobile-portrait .side-panel td {
+    padding: 4px 8px;
+}
+
+/* Standings list in drawer */
+body.mobile-portrait .standings-list .rank-row {
+    font-size: 0.85rem;
+    padding: 3px 0;
+}
+
+/* Game buttons in drawer */
+body.mobile-portrait .game-buttons {
+    display: flex;
+    gap: 8px;
+    justify-content: center;
+    padding: 8px 0;
+}
+
+/* --- Mobile: Bottom bar --- */
+body.mobile-portrait #mobile-bottom-bar {
+    display: flex;
+    justify-content: space-around;
+    align-items: center;
+    background: rgba(0, 0, 0, 0.5);
+    backdrop-filter: blur(10px);
+    padding: 6px 16px;
+    padding-bottom: calc(6px + env(safe-area-inset-bottom, 0px));
+    width: 100%;
+    z-index: 500;
+    flex-shrink: 0;
+    border-top: 1px solid rgba(244, 164, 96, 0.2);
+}
+
+body.mobile-portrait #mobile-bottom-bar .mobile-bar-btn {
+    background: none;
+    border: none;
+    color: rgba(255, 255, 255, 0.8);
+    font-size: 0.75rem;
+    font-weight: 600;
+    padding: 6px 16px;
+    cursor: pointer;
+    text-transform: uppercase;
+    letter-spacing: 0.08em;
+    border-radius: 6px;
+    transition: background 0.15s, color 0.15s;
+}
+
+body.mobile-portrait #mobile-bottom-bar .mobile-bar-btn:active {
+    background: rgba(244, 164, 96, 0.3);
+    color: #f4a460;
+}
+
+body.mobile-portrait #mobile-bottom-bar .mobile-bar-btn.active {
+    color: #f4a460;
+    background: rgba(244, 164, 96, 0.15);
+}
+
+/* --- Mobile: Non-game screens --- */
+body.mobile-portrait #lobby-screen {
+    padding: 50px 12px 15px;
+    overflow-y: auto;
+    max-height: 100dvh;
+}
+
+body.mobile-portrait #waiting-screen {
+    padding: 10px 12px;
+    overflow-y: auto;
+    max-height: 100dvh;
+}
+
+/* --- Mobile: Very short screens (e.g. iPhone SE) --- */
+@media (max-height: 600px) {
+    body.mobile-portrait .opponents-row {
+        padding: 2px 8px 0;
+    }
+
+    body.mobile-portrait .opponent-area .card-grid {
+        grid-template-columns: repeat(3, 26px) !important;
+        gap: 1px !important;
+    }
+
+    body.mobile-portrait .opponent-area .card {
+        width: 26px !important;
+        height: 36px !important;
+        font-size: 0.45rem !important;
+    }
+
+    body.mobile-portrait .table-center {
+        padding: 3px 8px;
+    }
+
+    body.mobile-portrait .deck-area > .card,
+    body.mobile-portrait #deck,
+    body.mobile-portrait #discard {
+        width: 50px !important;
+        height: 70px !important;
+        font-size: 1.1rem !important;
+    }
+
+    body.mobile-portrait .held-card-floating {
+        width: 60px !important;
+        height: 84px !important;
+    }
+
+    body.mobile-portrait .player-area {
+        padding: 3px 5px;
+    }
+
+    body.mobile-portrait .player-section .card-grid {
+        grid-template-columns: repeat(3, 60px) !important;
+        gap: 4px !important;
+    }
+
+    body.mobile-portrait .player-section .card {
+        width: 60px !important;
+        height: 84px !important;
+        font-size: 1.3rem !important;
+    }
+
+    body.mobile-portrait .player-area h4 {
+        font-size: 0.7rem;
+        padding: 2px 6px;
+        margin-bottom: 3px;
+    }
+}