SwordMasters.io - Custom UI Panel

Panel kéo được + On/Off + Slider (UI only, safe)
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// ==UserScript==
// @name         SwordMasters.io - Custom UI Panel
// @namespace    https://greasyfork.org/
// @version      2.0
// @description  Panel kéo được + On/Off + Slider (UI only, safe)
// @match        https://swordmasters.io/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    let value = 50;
    let isEnabled = false;

    const panel = document.createElement('div');
    panel.style.cssText = `
        position: fixed; left: 30px; top: 30px; z-index: 999999;
        background: rgba(0,0,0,0.85); color: white; padding: 15px;
        border-radius: 12px; font-family: Arial; width: 250px;
    `;

    panel.innerHTML = `
        <div style="font-weight:bold; margin-bottom:10px;">⚔️ Custom Panel</div>
        <div id="status">OFF</div>

        <input type="range" id="slider" min="1" max="100" value="${value}">
        <div>Value: <span id="val">${value}</span></div>

        <button id="btn">BẬT</button>
    `;

    document.body.appendChild(panel);

    const slider = panel.querySelector('#slider');
    const val = panel.querySelector('#val');
    const btn = panel.querySelector('#btn');
    const status = panel.querySelector('#status');

    slider.oninput = () => {
        value = slider.value;
        val.textContent = value;
    };

    btn.onclick = () => {
        isEnabled = !isEnabled;
        status.textContent = isEnabled ? "ON" : "OFF";
    };

    // drag
    let drag = false, x, y;

    panel.onmousedown = (e) => {
        drag = true;
        x = e.clientX - panel.offsetLeft;
        y = e.clientY - panel.offsetTop;
    };

    document.onmousemove = (e) => {
        if (drag) {
            panel.style.left = (e.clientX - x) + "px";
            panel.style.top = (e.clientY - y) + "px";
        }
    };

    document.onmouseup = () => drag = false;

})();