diff --git a/index.html b/index.html
index 7ad12b7..cf6cc0d 100644
--- a/index.html
+++ b/index.html
@@ -161,10 +161,14 @@
             text-decoration: underline;
         }
 
+        .search-wrapper {
+            position: relative;
+            margin-bottom: 1.5rem;
+        }
+
         #filter-input {
             width: 100%;
-            padding: 0.75rem 1rem;
-            margin-bottom: 1.5rem;
+            padding: 0.75rem 2.5rem 0.75rem 1rem;
             border: 1px solid #ddd;
             border-radius: 8px;
             font-size: 1rem;
@@ -178,6 +182,33 @@
             outline: none;
         }
 
+        #clear-btn {
+            position: absolute;
+            right: 0.5rem;
+            top: 50%;
+            transform: translateY(-50%);
+            background: none;
+            border: none;
+            color: #999;
+            font-size: 1.25rem;
+            cursor: pointer;
+            padding: 0.25rem 0.5rem;
+            border-radius: 4px;
+            transition: all 0.2s ease;
+            opacity: 0;
+            pointer-events: none;
+        }
+
+        #clear-btn.visible {
+            opacity: 1;
+            pointer-events: auto;
+        }
+
+        #clear-btn:hover {
+            color: #667eea;
+            background: rgba(102, 126, 234, 0.1);
+        }
+
         #version-reload-btn {
             position: fixed;
             bottom: 20px;
@@ -217,12 +248,173 @@
                 opacity: 1;
             }
         }
+
+        /* Mobile Responsive Styles */
+        @media (max-width: 768px) {
+            body {
+                padding: 1rem;
+            }
+
+            .container {
+                padding: 1rem;
+                border-radius: 12px;
+            }
+
+            h1 {
+                font-size: 1.75rem;
+                margin-bottom: 1rem;
+            }
+
+            .search-wrapper {
+                margin-bottom: 1rem;
+            }
+
+            #filter-input {
+                padding: 0.625rem 2.25rem 0.625rem 0.875rem;
+                font-size: 0.95rem;
+            }
+
+            #clear-btn {
+                font-size: 1.1rem;
+                right: 0.375rem;
+            }
+
+            .tree ul {
+                padding-left: 1rem;
+            }
+
+            .category {
+                margin: 0.375rem 0;
+                padding: 0.625rem;
+                border-left-width: 3px;
+            }
+
+            .category-header {
+                gap: 0.75rem;
+            }
+
+            .category-image {
+                width: 40px;
+                height: 40px;
+            }
+
+            .category-name {
+                font-size: 1rem;
+            }
+
+            .category-count {
+                font-size: 0.85rem;
+            }
+
+            .toggle {
+                font-size: 0.9rem;
+                margin-right: 0.375rem;
+            }
+
+            .category-products {
+                padding-left: 2.5rem;
+                font-size: 0.85rem;
+            }
+
+            .product-image {
+                width: 28px;
+                height: 28px;
+            }
+
+            .product-item {
+                padding: 0.375rem 0;
+            }
+
+            #version-reload-btn {
+                bottom: 15px;
+                right: 15px;
+                padding: 10px 16px;
+                font-size: 0.85rem;
+            }
+
+            /* Ensure touch targets are at least 44px */
+            .category-header.has-children {
+                min-height: 44px;
+            }
+        }
+
+        @media (max-width: 480px) {
+            body {
+                padding: 0.5rem;
+            }
+
+            .container {
+                padding: 0.75rem;
+                border-radius: 8px;
+            }
+
+            h1 {
+                font-size: 1.5rem;
+                margin-bottom: 0.75rem;
+            }
+
+            #filter-input {
+                padding: 0.5rem 2rem 0.5rem 0.75rem;
+                font-size: 0.9rem;
+            }
+
+            #clear-btn {
+                font-size: 1rem;
+                right: 0.25rem;
+            }
+
+            .tree ul {
+                padding-left: 0.75rem;
+            }
+
+            .category {
+                margin: 0.25rem 0;
+                padding: 0.5rem;
+            }
+
+            .category-header {
+                gap: 0.5rem;
+            }
+
+            .category-image {
+                width: 36px;
+                height: 36px;
+            }
+
+            .category-name {
+                font-size: 0.95rem;
+            }
+
+            .category-count {
+                font-size: 0.8rem;
+            }
+
+            .category-products {
+                padding-left: 2rem;
+                font-size: 0.8rem;
+            }
+
+            .product-image {
+                width: 24px;
+                height: 24px;
+            }
+
+            #version-reload-btn {
+                bottom: 10px;
+                right: 10px;
+                padding: 8px 14px;
+                font-size: 0.8rem;
+            }
+        }
     </style>
 </head>
 
 <body>
     <div class="container">
-        <input type="text" id="filter-input" placeholder="🔍" autocomplete="off">
+        <div class="search-wrapper">
+            <input type="text" id="filter-input" placeholder="🔍" autocomplete="off">
+            <button id="clear-btn" title="Clear search">✕</button>
+        </div>
         <div id="tree-container">
             <div class="loading">Loading categories...</div>
         </div>
@@ -245,6 +437,12 @@
         // DOM Elements
         const container = document.getElementById('tree-container');
         const filterInput = document.getElementById('filter-input');
+        const clearBtn = document.getElementById('clear-btn');
+
+        // Auto-focus search field on page load
+        window.addEventListener('load', () => {
+            filterInput.focus();
+        });
 
         // Version checking
         const clientEtag = document.querySelector('meta[name="app-version"]')?.content;
@@ -294,6 +492,13 @@
             const value = e.target.value;
             state.filter = value;
 
+            // Toggle clear button visibility
+            if (value) {
+                clearBtn.classList.add('visible');
+            } else {
+                clearBtn.classList.remove('visible');
+            }
+
             if (value.trim()) {
                 debouncedSearch(value);
             } else {
@@ -305,6 +510,22 @@
             }
         });
 
+        // Clear button functionality
+        clearBtn.addEventListener('click', () => {
+            filterInput.value = '';
+            state.filter = '';
+            clearBtn.classList.remove('visible');
+
+            // Clear matches and collapse all categories
+            resetMatches(state.categories);
+            resetExpansion(state.categories);
+            collapseAllProducts(state.categories);
+            render();
+
+            // Refocus the input
+            filterInput.focus();
+        });
+
         socket.on('searchResults', ({ query, matches }) => {
             if (query !== state.filter) return;