Minefun Sky Color Shift

Change sky colors locally (client-side only)
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// ==UserScript==
// @name         Minefun Sky Color Shift
// @namespace    https://greasyfork.org
// @version      1.2
// @description  Change sky colors locally (client-side only)
// @match        *://*minefun*/*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    // ===== STYLE INJECTION =====
    const style = document.createElement("style");
    style.innerHTML = `
    .sky-filter {
        filter: hue-rotate(0deg) saturate(2) brightness(1.2) !important;
        transition: filter 0.5s linear;
    }

    #skyBtn {
        position: fixed;
        top: 100px;
        right: 20px;
        z-index: 99999;
        padding: 10px 14px;
        background: #111;
        color: white;
        border: 1px solid #444;
        cursor: pointer;
        user-select: none;
        font-family: sans-serif;
    }
    `;
    document.head.appendChild(style);

    // ===== APPLY TO GAME ROOT =====
    function applySky() {
        // Minefun thường dùng body hoặc canvas wrapper
        document.body.classList.add("sky-filter");
    }

    function removeSky() {
        document.body.classList.remove("sky-filter");
    }

    // ===== BUTTON =====
    const btn = document.createElement("div");
    btn.id = "skyBtn";
    btn.innerText = "Sky OFF";
    document.body.appendChild(btn);

    let enabled = false;
    let hue = 0;
    let interval = null;

    const colorsSpeed = 20;

    btn.onclick = () => {
        enabled = !enabled;

        if (enabled) {
            btn.innerText = "Sky ON";

            applySky();

            interval = setInterval(() => {
                hue += 15;
                if (hue > 360) hue = 0;

                document.body.style.filter =
                    `hue-rotate(${hue}deg) saturate(2) brightness(1.3)`;

            }, colorsSpeed);

        } else {
            btn.innerText = "Sky OFF";

            clearInterval(interval);
            removeSky();
            document.body.style.filter = "none";
        }
    };

    // ===== DRAG BUTTON =====
    let drag = false, ox, oy;

    btn.addEventListener("mousedown", (e) => {
        drag = true;
        ox = e.clientX - btn.offsetLeft;
        oy = e.clientY - btn.offsetTop;
    });

    document.addEventListener("mousemove", (e) => {
        if (!drag) return;
        btn.style.left = (e.clientX - ox) + "px";
        btn.style.top = (e.clientY - oy) + "px";
        btn.style.right = "auto";
    });

    document.addEventListener("mouseup", () => drag = false);

})();