diff --git a/agent.user.js b/agent.user.js
index 050c59f..4938a15 100644
--- a/agent.user.js
+++ b/agent.user.js
@@ -56,6 +56,40 @@
         delay: (ms) => new Promise(resolve => setTimeout(resolve, ms)),
     };
 
+
+    // ====== DOM helpers ======
+    TL.ui = {
+        isVisible: (el) => {
+            if (!el) return false;
+            const cs = getComputedStyle(el);
+            if (cs.display === 'none' || cs.visibility === 'hidden' || cs.opacity === '0') return false;
+            return (el.offsetWidth + el.offsetHeight) > 0;
+        },
+
+        isDisabled: (el) => {
+            return el?.disabled === true || el?.getAttribute('aria-disabled') === 'true';
+        },
+
+        isInViewport: (el) => {
+            if (!el) return false;
+            const rect = el.getBoundingClientRect();
+            return (
+                rect.top >= 0 &&
+                rect.left >= 0 &&
+                rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
+                rect.right <= (window.innerWidth || document.documentElement.clientWidth)
+            );
+        },
+
+        click: (el) => {
+            if (el && typeof el.click === 'function') el.click();
+        },
+
+        scrollToView: (el, behavior = 'smooth') => {
+            el?.scrollIntoView?.({ behavior, block: 'center' });
+        },
+    };
+
     // ====== Network helpers (GM_xmlhttpRequest) ======
     TL.net = {
         gmRequest(url, init = {}) {
@@ -175,6 +209,35 @@
 
     }
 
+    // ====== BINANCE (isLoggedIn) ======
+    const BINANCE = {
+        detectLoginState: () => {
+            const loginBtn = document.querySelector('#toLoginPage');
+            const regBtn = document.querySelector('#toRegisterPage');
+
+            if (TL.dom.isVisible?.(loginBtn) || TL.dom.isVisible?.(regBtn)) return false;
+            if (!loginBtn && !regBtn) return true;
+
+            return null; // đang load hoặc chưa rõ
+        },
+
+        isLoggedIn: async (timeoutMs = 6000, pollMs = 200) => {
+            const deadline = Date.now() + timeoutMs;
+            while (Date.now() < deadline) {
+                const state = BINANCE.detectLoginState();
+                if (state !== null) {
+                    TL.log(`[BINANCE] isLoggedIn => ${state ? 'true' : 'false'}`);
+                    return state;
+                }
+                await TL.delay(pollMs);
+            }
+
+            const fallback = BINANCE.detectLoginState() ?? false;
+            TL.log(`[BINANCE] isLoggedIn (timeout, fallback) => ${fallback ? 'true' : 'false'}`);
+            return fallback;
+        },
+    };
+
 
     // ====== Main ======
     async function welcome_message() {
@@ -183,7 +246,7 @@
         const res = await BAF.ping();
         const resStr =
             `Server: ${s.label} (${s.url})\n` +
-            `Status: ${res.ok ? 'Connected ✅' : 'Failed ❌'} (${res.status})`; 
+            `Status: ${res.ok ? 'Connected ✅' : 'Failed ❌'} (${res.status})`;
 
         TL.log(resStr);
     }