diff --git a/src/views/Main.vue b/src/views/Main.vue
index d715652..b8d5e00 100644
--- a/src/views/Main.vue
+++ b/src/views/Main.vue
@@ -152,7 +152,7 @@
 </template>
 
 <script setup>
-import { ref, onMounted, onUnmounted, computed } from 'vue';
+import { ref, onMounted, onUnmounted, computed, watch } from 'vue';
 import axios from 'axios';
 import TuiProgressBar from '@/components/TuiProgressBar.vue';
 
@@ -165,7 +165,14 @@ const loginPw = ref('');
 
 const activeMenu = ref('main');
 const authToken = ref(localStorage.getItem('token'));
-const activeTheme = ref('green');
+const currentUsername = ref(localStorage.getItem('username') || '');
+const VALID_THEMES = ['green', 'amber', 'vga', 'ega'];
+const storedTheme = localStorage.getItem('theme');
+const activeTheme = ref(VALID_THEMES.includes(storedTheme) ? storedTheme : 'green');
+
+watch(activeTheme, (theme) => {
+  localStorage.setItem('theme', theme);
+});
 
 const isProcessing = ref(false);
 const overlayProgress = ref(0);
@@ -187,6 +194,14 @@ const menuItems = [
 
 const isLoggedIn = computed(() => !!authToken.value);
 
+const terminalPrompt = () => `${isLoggedIn.value && currentUsername.value ? currentUsername.value : 'anonymous'}@specialsource:~$ `;
+
+const syncTerminalPrompt = () => {
+  if (termInstance.value) {
+    termInstance.value.set_prompt(terminalPrompt());
+  }
+};
+
 const currentServerSourceDisplay = computed(() => {
   if (currentServerSource.value === 'firebase_night') {
     return 'SYS: CLOUD_REDUNDANCY (NIGHT)';
@@ -316,11 +331,14 @@ const handleRegister = () => alert("회원가입은 현재 관리자 승인제
 
 const handleLogout = () => {
   localStorage.removeItem('token');
+  localStorage.removeItem('username');
   authToken.value = null;
+  currentUsername.value = '';
   activeMenu.value = 'main';
   if (termInstance.value) {
     termInstance.value.echo(`\n[[b;red;][ALERT]] SESSION TERMINATED. USER LOGGED OUT.`);
   }
+  syncTerminalPrompt();
 };
 
 const handleLoginSubmit = async () => {
@@ -356,7 +374,10 @@ const handleLoginSubmit = async () => {
       overlayStatus.value = 'Access Granted. Generating JWT Session token...';
 
       localStorage.setItem('token', response.data.token);
+      localStorage.setItem('username', loginId.value);
       authToken.value = response.data.token;
+      currentUsername.value = loginId.value;
+      syncTerminalPrompt();
 
       if (termInstance.value) {
         termInstance.value.echo(`[[b;var(--tui-color);][SUCCESS]] ACCESS GRANTED. CREDENTIALS VERIFIED.`);
@@ -429,12 +450,53 @@ onMounted(() => {
         }, 110);
       },
 
+      'login': function () {
+        const term = this;
+
+        if (isLoggedIn.value) {
+          term.echo(`\n[[b;red;][ERROR]] ALREADY AUTHENTICATED AS ${currentUsername.value || 'ADMIN'}. TYPE 'logout' FIRST TO SWITCH USER.`);
+          return;
+        }
+
+        term.echo(`\n[SYS] LOGIN: ENTER CREDENTIALS TO AUTHENTICATE.`);
+
+        term.read('ACCESS ID: ').then((id) => {
+          term.set_mask(true);
+          return term.read('ACCESS KEY: ').then((pw) => {
+            term.set_mask(false);
+            return { id, pw };
+          });
+        }).then(({ id, pw }) => {
+          if (!id || !pw) {
+            term.echo(`[[b;red;][ERROR]] ACCESS ID/KEY CANNOT BE EMPTY.`);
+            return;
+          }
+          loginId.value = id;
+          loginPw.value = pw;
+          handleLoginSubmit();
+        }).catch(() => {
+          term.set_mask(false);
+          term.echo(`\n[[b;red;][LOGIN]] AUTHENTICATION CANCELLED.`);
+        });
+      },
+
+      'logout': function () {
+        const term = this;
+
+        if (!isLoggedIn.value) {
+          term.echo(`\n[[b;red;][ERROR]] NOT AUTHENTICATED. NOTHING TO LOG OUT OF.`);
+          return;
+        }
+
+        handleLogout();
+      },
+
       'help': function () {
-        this.echo(`- hello          : Say hello\n- specialsource  : Core info\n- email          : Contact\n- status         : Check Live Connected Users\n- clear          : Clear console`);
+        this.echo(`- hello          : Say hello\n- specialsource  : Core info\n- email          : Contact\n- status         : Check Live Connected Users\n- login          : Login via ID/Password prompt\n- logout         : Log out of current session\n- clear          : Clear console`);
       },
     }, {
       greetings: `[SYSTEM V3.2] INTERFACE ONLINE. TYPE 'help' FOR COMMANDS.`,
-      prompt: 'admin@specialsource:~$ '
+      prompt: terminalPrompt()
     });
   }
 });
@@ -584,7 +646,7 @@ onUnmounted(() => {
 .status-dot.secure-mode { background: var(--tui-color); box-shadow: 0 0 8px var(--tui-color); }
 
 /* --- 컨텐츠 영역 --- */
-.content-area { flex: 1; padding: 20px; min-height: 400px; overflow-y: auto; display: flex; flex-direction: column; }
+.content-area { flex: 1; padding: 8px 20px; min-height: 220px; overflow-y: auto; display: flex; flex-direction: column; }
 .sub-page { max-width: 1000px; margin: 0 auto; padding-top: 15px; width: 100%; }
 .page-title { border-bottom: 1px solid var(--tui-border); padding-bottom: 10px; margin-bottom: 20px; color: var(--tui-color);}
 
@@ -596,7 +658,7 @@ onUnmounted(() => {
   justify-content: center; align-items: center; pointer-events: all;
 }
 
-.ascii-container { width: 100%; overflow: auto; padding: 20px; box-sizing: border-box; position: relative; }
+.ascii-container { width: 100%; overflow: auto; padding: 6px 20px; box-sizing: border-box; position: relative; }
 .ascii-art {
   font-weight: bold; white-space: pre; display: block; margin: 0 auto; width: max-content;
   color: var(--tui-color) !important; font-size: 14px; line-height: 1.2;
@@ -648,7 +710,7 @@ iframe { width: 100%; height: 180px; border-radius: 4px; }
 .fade-enter-from, .fade-leave-to { opacity: 0; }
 
 /* 하단 CRT 터미널 */
-.crt-monitor-frame { height: 300px; margin: 10px 40px 30px; border: 2px solid #1a1a1a; background: #0a0a0a; overflow: hidden; }
+.crt-monitor-frame { height: 300px; margin: 6px 40px 14px; border: 2px solid #1a1a1a; background: #0a0a0a; overflow: hidden; }
 .monitor-header { background: #151515; padding: 5px 15px; color: #555; display: flex; justify-content: space-between; font-size: 12px;}
 .monitor-status { color: var(--tui-dim); animation: blink 2s infinite; }
 .crt-screen-overlay { position: relative; height: calc(100% - 30px); background: #020802; }
@@ -731,7 +793,7 @@ iframe { width: 100%; height: 180px; border-radius: 4px; }
   /* 5. 터미널 창 모바일 최적화 */
   .crt-monitor-frame {
     height: 180px !important;
-    margin: 10px !important;
+    margin: 6px 10px !important;
   }
   .monitor-header { padding: 4px 10px; font-size: 10px; }
 }