diff --git a/ESP32_CAN_Logger-a.ino b/ESP32_CAN_Logger-a.ino
index 21c3c55..97b6921 100644
--- a/ESP32_CAN_Logger-a.ino
+++ b/ESP32_CAN_Logger-a.ino
@@ -2960,6 +2960,27 @@ void webUpdateTask(void *parameter) {
             doc["sdReady"] = sdCardReady;
             doc["totalMsg"] = totalMsgCount;
             doc["msgPerSec"] = msgPerSecond;
+            
+            // 🆕 CAN 버스 부하율 계산
+            // CAN 속도별 이론적 최대 메시지/초 (8바이트 데이터 기준)
+            // 125 Kbps: ~1,000 msg/s
+            // 250 Kbps: ~2,000 msg/s
+            // 500 Kbps: ~4,000 msg/s
+            // 1 Mbps:   ~8,000 msg/s
+            uint32_t maxMsgPerSec;
+            switch(currentCanSpeed) {
+                case CAN_125KBPS: maxMsgPerSec = 1000; break;
+                case CAN_250KBPS: maxMsgPerSec = 2000; break;
+                case CAN_500KBPS: maxMsgPerSec = 4000; break;
+                case CAN_1000KBPS: 
+                default: maxMsgPerSec = 8000; break;
+            }
+            
+            // 부하율 계산 (0~100%)
+            float busLoad = (msgPerSecond * 100.0) / maxMsgPerSec;
+            if (busLoad > 100.0) busLoad = 100.0;
+            doc["busLoad"] = (int)busLoad;  // 정수로 전송
+            
             doc["totalTx"] = totalTxCount;
             doc["totalSerialRx"] = totalSerialRxCount;
             doc["totalSerialTx"] = totalSerialTxCount;
diff --git a/index.h b/index.h
index 336c7a6..517e617 100644
--- a/index.h
+++ b/index.h
@@ -252,14 +252,14 @@ const char index_html[] PROGMEM = R"rawliteral(
         
         .status-grid {
             display: grid;
-            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
-            gap: 10px;
+            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
+            gap: 12px;
             margin-bottom: 20px;
         }
         .status-card {
             background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
             color: white;
-            padding: 15px;
+            padding: 18px 12px;
             border-radius: 10px;
             text-align: center;
             box-shadow: 0 4px 15px rgba(0,0,0,0.2);
@@ -270,15 +270,17 @@ const char index_html[] PROGMEM = R"rawliteral(
             box-shadow: 0 6px 20px rgba(0,0,0,0.3);
         }
         .status-card h3 {
-            font-size: 0.75em;
-            opacity: 0.9;
-            margin-bottom: 8px;
-            letter-spacing: 1px;
+            font-size: 0.8em;
+            opacity: 0.95;
+            margin-bottom: 10px;
+            letter-spacing: 0.5px;
+            font-weight: 600;
         }
         .status-card .value {
-            font-size: 1.5em;
+            font-size: 1.6em;
             font-weight: 700;
             font-family: 'Courier New', monospace;
+            line-height: 1.2;
         }
         .status-card.status-on {
             background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
@@ -288,6 +290,41 @@ const char index_html[] PROGMEM = R"rawliteral(
             opacity: 0.7;
         }
         
+        /* 버스 부하율 색상 */
+        .status-card.bus-load-low {
+            background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
+        }
+        .status-card.bus-load-medium {
+            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
+        }
+        .status-card.bus-load-high {
+            background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
+        }
+        
+        /* 반응형: 모바일 */
+        @media (max-width: 768px) {
+            .status-grid {
+                grid-template-columns: repeat(2, 1fr);
+                gap: 10px;
+            }
+            .status-card {
+                padding: 15px 10px;
+            }
+            .status-card h3 {
+                font-size: 0.75em;
+            }
+            .status-card .value {
+                font-size: 1.4em;
+            }
+        }
+        
+        /* 반응형: 대형 화면 */
+        @media (min-width: 1200px) {
+            .status-grid {
+                grid-template-columns: repeat(5, 1fr);
+            }
+        }
+        
         h2 {
             color: #333;
             margin: 20px 0 10px 0;
@@ -339,7 +376,7 @@ const char index_html[] PROGMEM = R"rawliteral(
             cursor: pointer;
             transition: all 0.3s;
             background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
-            color: white;  /* ⭐ #666 → white */
+            color: white;
         }
         .control-row button:hover {
             transform: translateY(-2px);
@@ -855,7 +892,7 @@ const char index_html[] PROGMEM = R"rawliteral(
                     </div>
                     <div class="time-info-item">
                         <div class="time-label">CONNECTION</div>
-                        <div class="time-value" id="sync-status">연결 중...</div>
+                        <div class="time-value" id="sync-status">Connecting...</div>
                     </div>
                 </div>
                 <button class="btn-time-sync" onclick="syncTimeFromPhone()">📱 Sync from Phone</button>
@@ -906,6 +943,10 @@ const char index_html[] PROGMEM = R"rawliteral(
                     <h3>SPEED</h3>
                     <div class="value" id="msg-speed">0/s</div>
                 </div>
+                <div class="status-card" id="bus-load-card">
+                    <h3>BUS LOAD</h3>
+                    <div class="value" id="bus-load">0%</div>
+                </div>
                 <div class="status-card status-off" id="time-sync-card">
                     <h3>TIME SYNC</h3>
                     <div class="value" id="sync-count">0</div>
@@ -971,14 +1012,14 @@ const char index_html[] PROGMEM = R"rawliteral(
                             <span class="format-info">(Text - Excel Ready)</span>
                         </label>
                     </div>
-                    <button onclick="saveFileFormat()" style="background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); padding: 8px 16px;">💾 Save</button>
+                    <button onclick="saveFileFormat()">💾 Save</button>
                     <span id="format-save-status" style="color: #11998e; font-size: 0.85em; font-weight: 600;"></span>
                 </div>
                 <div class="control-row">
-                    <button onclick="startLogging()" style="background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);">Start Logging</button>
-                    <button onclick="stopLogging()" style="background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);">Stop Logging</button>
-                    <button onclick="hardwareReset()" style="background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); color: white;">🔄 Hardware Reset</button>
-                    <button onclick="clearMessages()">Clear Display</button>
+                    <button onclick="startLogging()">▶ Start Logging</button>
+                    <button onclick="stopLogging()">⏹ Stop Logging</button>
+                    <button onclick="hardwareReset()">🔄 Hardware Reset</button>
+                    <button onclick="clearMessages()">🗑 Clear Display</button>
                 </div>
             </div>
             
@@ -1105,7 +1146,7 @@ const char index_html[] PROGMEM = R"rawliteral(
                             <th>DLC</th>
                             <th>Data</th>
                             <th>Count</th>
-                            <th>Time(ms)</th>
+                            <th>Time</th>
                         </tr>
                     </thead>
                     <tbody id="can-messages"></tbody>
@@ -1164,8 +1205,24 @@ const char index_html[] PROGMEM = R"rawliteral(
         
         function updateCurrentTime() {
             const now = new Date();
-            const timeStr = now.toLocaleTimeString('ko-KR', {hour12: false});
-            document.getElementById('current-time').textContent = timeStr;
+            const h = String(now.getHours()).padStart(2, '0');
+            const m = String(now.getMinutes()).padStart(2, '0');
+            const s = String(now.getSeconds()).padStart(2, '0');
+            document.getElementById('current-time').textContent = `${h}h ${m}m ${s}s`;
+        }
+        
+        // CAN 메시지 시간 포맷 함수 (초.밀리초 형식으로 간결하게)
+        function formatTimestamp(ms) {
+            const totalSeconds = ms / 1000;
+            
+            // 1초 미만: 0.xxx s
+            if (ms < 1000) {
+                return `${totalSeconds.toFixed(3)} s`;
+            }
+            // 1초 이상: xxx.xxx s (소수점 3자리)
+            else {
+                return `${totalSeconds.toFixed(3)} s`;
+            }
         }
         setInterval(updateCurrentTime, 1000);
         updateCurrentTime();
@@ -1217,7 +1274,7 @@ const char index_html[] PROGMEM = R"rawliteral(
             
             ws.onopen = function() {
                 console.log('WebSocket connected');
-                document.getElementById('sync-status').textContent = '연결됨';
+                document.getElementById('sync-status').textContent = 'Connected';
                 document.getElementById('sync-status').style.color = '#38ef7d';
                 
                 // ⭐⭐⭐ 자동 시간 동기화 (페이지 로드 시 항상 실행)
@@ -1238,7 +1295,7 @@ const char index_html[] PROGMEM = R"rawliteral(
             
             ws.onclose = function() {
                 console.log('WebSocket disconnected');
-                document.getElementById('sync-status').textContent = '연결 끊김';
+                document.getElementById('sync-status').textContent = 'Disconnected';
                 document.getElementById('sync-status').style.color = '#f45c43';
                 mcpModeSynced = false;  // 🆕 재연결 시 다시 동기화하도록 플래그 리셋
                 window.canFormatSynced = false;  // 🆕 File Format도 재동기화
@@ -1422,6 +1479,23 @@ const char index_html[] PROGMEM = R"rawliteral(
                 document.getElementById('msg-speed').textContent = data.msgPerSec + '/s';
             }
             
+            // 🆕 버스 부하율 업데이트
+            if (data.busLoad !== undefined) {
+                const busLoadCard = document.getElementById('bus-load-card');
+                const busLoadValue = document.getElementById('bus-load');
+                busLoadValue.textContent = data.busLoad + '%';
+                
+                // 색상 변경 (부하율에 따라)
+                busLoadCard.classList.remove('bus-load-low', 'bus-load-medium', 'bus-load-high');
+                if (data.busLoad < 50) {
+                    busLoadCard.classList.add('bus-load-low');
+                } else if (data.busLoad < 80) {
+                    busLoadCard.classList.add('bus-load-medium');
+                } else {
+                    busLoadCard.classList.add('bus-load-high');
+                }
+            }
+            
             // 시간 동기화 - ★ 수정: timeSync 또는 timeSynced 둘 다 지원
             const timeSyncCard = document.getElementById('time-sync-card');
             const timeSynced = data.timeSynced !== undefined ? data.timeSynced : data.timeSync;
@@ -1612,7 +1686,7 @@ const char index_html[] PROGMEM = R"rawliteral(
                     row.cells[1].textContent = msg.dlc;
                     row.cells[2].textContent = msg.data;
                     row.cells[3].textContent = msg.updateCount;
-                    row.cells[4].textContent = msg.timestamp;
+                    row.cells[4].textContent = formatTimestamp(msg.timestamp);
                     
                     if (hasChanged) {
                         row.classList.add('flash-row');
@@ -1626,7 +1700,7 @@ const char index_html[] PROGMEM = R"rawliteral(
                         '<td>' + msg.dlc + '</td>' +
                         '<td class="mono">' + msg.data + '</td>' +
                         '<td>' + msg.updateCount + '</td>' +
-                        '<td>' + msg.timestamp + '</td>';
+                        '<td>' + formatTimestamp(msg.timestamp) + '</td>';
                     row.classList.add('flash-row');
                     setTimeout(() => row.classList.remove('flash-row'), 300);
                 }