May the Light Force be with you! Forces dark-themed websites into light mode, leaving originally light websites unaffected.
// ==UserScript==
// @name Light Force
// @name:zh Light Force (光明原力)
// @namespace https://ct106.com
// @version 1.4.0
// @description May the Light Force be with you! Forces dark-themed websites into light mode, leaving originally light websites unaffected.
// @description:zh 愿光明原力与你同在！将深色模式网站强制转为浅色模式，不影响原生浅色网站。
// @author chentao1006
// @match *://*/*
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_registerMenuCommand
// @run-at document-start
// @allFrames true
// ==/UserScript==
(function () {
'use strict';
const lang = navigator.language.startsWith('zh') ? 'zh' : 'en';
const i18n = {
zh: {
enabled: '已启用',
disabled: '已禁用',
yes: '是',
no: '否',
enableForce: '启用 强制浅色模式',
disableForce: '禁用 强制浅色模式',
enableDaylight: '启用 仅系统浅色时生效',
disableDaylight: '禁用 仅系统浅色时生效',
status: '状态',
onlyDaylight: '仅系统浅色时生效',
darkDetected: '探测到深色页面 — 应用滤镜反转',
lightDetected: '页面为浅色 — 检查深色容器',
dynamicDark: '页面动态变为深色 — 应用滤镜反转',
daylightActive: '已开启“仅系统浅色时生效”，且当前系统为深色。跳过。',
runMode: '生效范围',
exclusionMode: '除列表外所有网站',
inclusionMode: '仅列表内网站',
addToList: '将当前网站加入列表',
removeFromList: '从列表中移除当前网站',
siteInList: '当前网站已在列表中',
siteNotInList: '当前网站不在列表中',
manageSiteList: '管理网站列表',
manageSiteListPrompt: '请输入生效网站的域名列表（以英文逗号分隔）：'
},
en: {
enabled: 'Enabled',
disabled: 'Disabled',
yes: 'Yes',
no: 'No',
enableForce: 'Enable Light Force',
disableForce: 'Disable Light Force',
enableDaylight: 'Enable Only in System Light Mode',
disableDaylight: 'Disable Only in System Light Mode',
status: 'Status',
onlyDaylight: 'Only in System Light Mode',
darkDetected: 'Page detected as dark — applying filter inversion',
lightDetected: 'Page is light — checking for dark containers',
dynamicDark: 'Page turned dark dynamically — applying filter inversion',
daylightActive: '"Only in System Light Mode" is active and system is currently in Dark Mode. Skipping.',
runMode: 'Run Mode',
exclusionMode: 'All sites except list',
inclusionMode: 'Specific sites only',
addToList: 'Add site to list',
removeFromList: 'Remove site from list',
siteInList: 'Current site is in list',
siteNotInList: 'Current site is not in list',
manageSiteList: 'Manage Site List',
manageSiteListPrompt: 'Enter the list of domains (comma separated):'
}
}[lang];
let isEnabled = GM_getValue('lightForceEnabled', true);
let isOnlyDaylight = GM_getValue('onlyDaylightEnabled', false);
let runMode = GM_getValue('runMode', 'inclusion');
let siteList = GM_getValue('siteList', []);
const hostname = window.location.hostname;
console.log(`[Light Force] ${i18n.status}:`, isEnabled ? i18n.enabled : i18n.disabled, `| ${i18n.onlyDaylight}:`, isOnlyDaylight ? i18n.yes : i18n.no, `| ${i18n.runMode}:`, runMode === 'exclusion' ? i18n.exclusionMode : i18n.inclusionMode);
GM_registerMenuCommand(isEnabled ? i18n.disableForce : i18n.enableForce, () => {
GM_setValue('lightForceEnabled', !isEnabled);
location.reload();
});
GM_registerMenuCommand(isOnlyDaylight ? i18n.disableDaylight : i18n.enableDaylight, () => {
GM_setValue('onlyDaylightEnabled', !isOnlyDaylight);
location.reload();
});
GM_registerMenuCommand(`${i18n.runMode}: ${runMode === 'exclusion' ? i18n.exclusionMode : i18n.inclusionMode}`, () => {
GM_setValue('runMode', runMode === 'exclusion' ? 'inclusion' : 'exclusion');
location.reload();
});
const match = siteList.find(site => hostname === site || hostname.endsWith('.' + site));
const isInList = !!match;
GM_registerMenuCommand(isInList ? i18n.removeFromList : i18n.addToList, () => {
let newList = [...siteList];
if (match) {
newList = newList.filter(s => s !== match);
} else {
newList.push(hostname);
}
GM_setValue('siteList', newList);
location.reload();
});
GM_registerMenuCommand(i18n.manageSiteList, () => {
const input = prompt(i18n.manageSiteListPrompt, siteList.join(', '));
if (input !== null) {
const newList = input.split(',').map(s => s.trim()).filter(Boolean);
GM_setValue('siteList', newList);
location.reload();
}
});
if (isEnabled) {
if (runMode === 'exclusion' && isInList) {
console.log(`[Light Force] ${i18n.siteInList}. Skipping.`);
return;
}
if (runMode === 'inclusion' && !isInList) {
console.log(`[Light Force] ${i18n.siteNotInList}. Skipping.`);
return;
}
if (isOnlyDaylight && window.matchMedia('(prefers-color-scheme: dark)').matches) {
console.log(`[Light Force] ${i18n.daylightActive}`);
return;
}
applyLightForce();
}
// ─── Utility: WCAG relative luminance ─────────────────────────────────────
function getLuminance(r, g, b) {
const [rs, gs, bs] = [r, g, b].map(c => {
c = c / 255;
return c <= 0.03928 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4);
});
return 0.2126 * rs + 0.7152 * gs + 0.0722 * bs;
}
function parseColor(colorStr) {
if (!colorStr || colorStr === 'transparent' || colorStr === 'rgba(0, 0, 0, 0)') return null;
const match = colorStr.match(/rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*([\d.]+))?\)/);
if (match) {
const a = match[4] !== undefined ? parseFloat(match[4]) : 1;
if (a < 0.1) return null;
return { r: parseInt(match[1]), g: parseInt(match[2]), b: parseInt(match[3]), a };
}
return null;
}
function isDarkColor(r, g, b) { return getLuminance(r, g, b) < 0.12; }
function isLightColor(r, g, b) { return getLuminance(r, g, b) > 0.4; }
function isTextDark(el) {
if (!el) return false;
const style = window.getComputedStyle(el);
const color = parseColor(style.color);
return color && getLuminance(color.r, color.g, color.b) < 0.25;
}
// ─── Extract effective background from an element ─────────────────────────
function getEffectiveBackground(el) {
if (!el) return null;
const style = window.getComputedStyle(el);
const bg = parseColor(style.backgroundColor);
if (bg) return bg;
const bgImage = style.backgroundImage;
if (bgImage && bgImage !== 'none') {
const gradientColors = bgImage.match(/rgba?\(\d+,\s*\d+,\s*\d+(?:,\s*[\d.]+)?\)/g);
if (gradientColors) {
let dc = 0;
for (const cs of gradientColors) { const c = parseColor(cs); if (c && isDarkColor(c.r, c.g, c.b)) dc++; }
if (dc > gradientColors.length / 2) return parseColor(gradientColors[0]);
}
}
return null;
}
// ─── Detect if the page is dark (multi-strategy) ──────────────────────────
function isPageDark() {
// Strategy 0: Master Light Override
const mt = document.querySelectorAll('div, section, main, article');
for (const el of mt) {
const r = el.getBoundingClientRect();
if (r.width > window.innerWidth * 0.6 && r.height > window.innerHeight * 0.4) {
const bg = getEffectiveBackground(el);
if (bg && isLightColor(bg.r, bg.g, bg.b)) return false;
}
}
// Strategy 1: html and body
for (const el of [document.documentElement, document.body]) {
if (!el) continue;
// --- NEW: Check for explicit color-scheme property ---
const style = window.getComputedStyle(el);
if (style.colorScheme === 'dark') return true;
const bg = getEffectiveBackground(el);
if (!bg) continue;
// --- NEW: Definitive Light Signal ---
if (isLightColor(bg.r, bg.g, bg.b)) return false;
// --- NEW: Relaxed explicit check for body/html ---
if (isDarkColor(bg.r, bg.g, bg.b)) {
const luminance = getLuminance(bg.r, bg.g, bg.b);
if (luminance < 0.05 && !isTextDark(el)) return true;
if (!isTextDark(el)) return true;
}
}
// Strategy 1.5: Check meta tags
const themeColorMeta = document.querySelector('meta[name="theme-color"]');
if (themeColorMeta) {
const content = themeColorMeta.getAttribute('content');
if (content && content.toLowerCase() === '#000000') return true;
}
const statusBarStyle = document.querySelector('meta[name="apple-mobile-web-app-status-bar-style"]');
if (statusBarStyle && statusBarStyle.getAttribute('content') === 'black') return true;
// Strategy 2: Sample first-level children
if (document.body) {
const children = document.body.children;
let db = 0, dt = 0, s = 0;
for (let i = 0; i < Math.min(children.length, 12); i++) {
const child = children[i];
if (!child || ['SCRIPT', 'STYLE', 'LINK', 'NOSCRIPT'].includes(child.tagName)) continue;
const rect = child.getBoundingClientRect();
if (rect.width < 50 || rect.height < 20) continue;
const bg = getEffectiveBackground(child);
if (bg && isDarkColor(bg.r, bg.g, bg.b)) db++;
if (isTextDark(child)) dt++;
s++;
}
if (s > 0 && db / s >= 0.4 && dt / s < 0.3) return true;
}
// Strategy 3: elementFromPoint sampling
try {
const vw = window.innerWidth, vh = window.innerHeight;
const points = [[vw * 0.5, vh * 0.1], [vw * 0.5, vh * 0.5], [vw * 0.1, vh * 0.5], [vw * 0.9, vh * 0.5], [vw * 0.5, vh * 0.9]];
let db = 0, dt = 0, ts = 0;
for (const [x, y] of points) {
const el = document.elementFromPoint(x, y);
if (!el) continue;
let curr = el, foundBg = false;
while (curr && curr !== document.documentElement) {
const bg = getEffectiveBackground(curr);
if (bg) { if (isDarkColor(bg.r, bg.g, bg.b)) db++; foundBg = true; break; }
curr = curr.parentElement;
}
if (foundBg) { if (isTextDark(el)) dt++; ts++; }
}
if (ts >= 3 && db / ts >= 0.5 && dt / ts < 0.3) return true;
} catch (e) { }
// Strategy 4: Recursive descent into large containers
if (document.body) {
const queue = [...document.body.children];
let depth = 0;
while (queue.length > 0 && depth < 3) {
depth++;
const nextQueue = [];
for (const child of queue) {
if (!child || !child.getBoundingClientRect) continue;
if (['SCRIPT', 'STYLE', 'LINK', 'NOSCRIPT'].includes(child.tagName)) continue;
const rect = child.getBoundingClientRect();
if (rect.width < window.innerWidth * 0.5 || rect.height < window.innerHeight * 0.3) continue;
const bg = getEffectiveBackground(child);
if (bg && isDarkColor(bg.r, bg.g, bg.b)) return true;
if (child.children) nextQueue.push(...child.children);
}
queue.length = 0;
queue.push(...nextQueue);
}
}
return false;
}
// ─── Phase 1: Flip known theme signals ────────────────────────────────────
function flipThemeSignals() {
if (!document.getElementById('light-force-color-scheme')) {
const style = document.createElement('style');
style.id = 'light-force-color-scheme';
style.textContent = ':root, html, body { color-scheme: light !important; }';
(document.head || document.documentElement).appendChild(style);
}
const root = document.documentElement;
if (root) {
if (root.classList.contains('dark')) { root.classList.remove('dark'); root.classList.add('light'); }
['dark-mode', 'dark-theme', 'theme-dark', 'night', 'night-mode', 'theme-system'].forEach(cls => {
if (root.classList.contains(cls)) {
root.classList.remove(cls);
if (cls === 'theme-system') root.classList.add('theme-light');
}
});
['theme', 'data-theme', 'data-color-mode', 'data-color-scheme', 'data-mode', 'data-appearance', 'data-bs-theme'].forEach(attr => {
const val = root.getAttribute(attr);
if (val && /dark|night/i.test(val)) root.setAttribute(attr, val.replace(/dark|night/gi, 'light'));
});
const inlineStyle = root.getAttribute('style') || '';
if (/color-scheme:\s*dark/i.test(inlineStyle)) {
root.setAttribute('style', inlineStyle.replace(/color-scheme:\s*dark/gi, 'color-scheme: light'));
}
}
const body = document.body;
if (body) {
if (body.classList.contains('dark')) { body.classList.remove('dark'); body.classList.add('light'); }
['dark-mode', 'dark-theme', 'theme-dark', 'night', 'night-mode', 'theme-system'].forEach(cls => {
if (body.classList.contains(cls)) {
body.classList.remove(cls);
if (cls === 'theme-system') body.classList.add('theme-light');
}
});
['data-theme', 'data-color-mode', 'data-bs-theme'].forEach(attr => {
const val = body.getAttribute(attr);
if (val && /dark|night/i.test(val)) body.setAttribute(attr, val.replace(/dark|night/gi, 'light'));
});
}
if (!document.getElementById('light-force-theme-overrides')) {
const overrideStyle = document.createElement('style');
overrideStyle.id = 'light-force-theme-overrides';
overrideStyle.textContent = `
:root[data-theme="dark"], :root.dark,
[data-theme="dark"] body, .dark body {
--background: 0 0% 100% !important;
--foreground: 222.2 84% 4.9% !important;
background-color: white !important;
color: #1a1a1a !important;
}
`;
(document.head || document.documentElement).appendChild(overrideStyle);
}
}
// ─── Phase 3: Universal CSS filter inversion ──────────────────────────────
function applyFilterInversion() {
if (document.getElementById('light-force-invert')) return;
const invertStyle = document.createElement('style');
invertStyle.id = 'light-force-invert';
invertStyle.textContent = `
html { filter: invert(1) hue-rotate(180deg) !important; }
img, video, canvas, .emoji, iframe { filter: invert(1) hue-rotate(180deg) !important; }
svg image { filter: invert(1) hue-rotate(180deg) !important; }
`;
(document.head || document.documentElement).appendChild(invertStyle);
requestAnimationFrame(() => { reInvertBackgroundImages(); });
}
function reInvertBackgroundImages() {
if (document.getElementById('light-force-bg-reinvert')) return;
const walker = document.createTreeWalker(document.body || document.documentElement, NodeFilter.SHOW_ELEMENT, null);
const leafRules = [], containerRules = [];
let count = 0, node;
while ((node = walker.nextNode()) && count < 5000) {
count++;
const style = window.getComputedStyle(node);
const bg = style.backgroundImage;
if (!bg || bg === 'none' || !bg.includes('url(')) continue;
const uid = 'lf-' + Math.random().toString(36).substr(2, 6);
node.setAttribute('data-lf-bg', uid);
const hasMedia = node.querySelector('img, video, canvas, iframe');
const isLarge = node.offsetWidth > window.innerWidth * 0.4 && node.offsetHeight > window.innerHeight * 0.4;
if (hasMedia || isLarge || node === document.body || node === document.documentElement) {
containerRules.push(`
[data-lf-bg="${uid}"] { position: relative !important; background-image: none !important; z-index: 0 !important; }
[data-lf-bg="${uid}"]::before {
content: "" !important; position: absolute !important; top: 0 !important; left: 0 !important; width: 100% !important; height: 100% !important;
background-image: ${bg} !important; background-size: ${style.backgroundSize} !important; background-position: ${style.backgroundPosition} !important;
background-repeat: ${style.backgroundRepeat} !important; background-attachment: ${style.backgroundAttachment} !important;
filter: invert(1) hue-rotate(180deg) !important; z-index: -1 !important; pointer-events: none !important; opacity: ${style.opacity} !important;
}
`);
} else {
leafRules.push(`[data-lf-bg="${uid}"] { filter: invert(1) hue-rotate(180deg) !important; }`);
}
}
if (leafRules.length > 0 || containerRules.length > 0) {
const bgStyle = document.createElement('style');
bgStyle.id = 'light-force-bg-reinvert';
bgStyle.textContent = leafRules.join('\n') + '\n' + containerRules.join('\n');
document.head.appendChild(bgStyle);
}
}
// ─── Phase 4: Illuminate specific dark containers (for mixed-theme sites) ────
function illuminateSpecificDarkAreas() {
if (document.getElementById('light-force-invert')) return;
const selector = 'header, footer, nav, aside, [class*="header"], [class*="nav"], [class*="footer"], [class*="banner"], [class*="topbar"]';
const targets = document.querySelectorAll(selector);
targets.forEach(el => {
if (el.hasAttribute('data-lf-illuminated')) return;
const rect = el.getBoundingClientRect();
if (rect.width < 100 || rect.height < 20) return;
const bg = getEffectiveBackground(el);
if (bg && isDarkColor(bg.r, bg.g, bg.b)) {
el.setAttribute('data-lf-illuminated', 'true');
el.style.filter = 'invert(1) hue-rotate(180deg)';
el.querySelectorAll('img, video, canvas, svg, [style*="background-image"]').forEach(media => {
media.style.filter = 'invert(1) hue-rotate(180deg)';
});
}
});
}
// ─── Main ──────────────────────────────────────────────────────────────────
function applyLightForce() {
flipThemeSignals();
const detectAndFix = () => {
flipThemeSignals();
requestAnimationFrame(() => {
if (isPageDark()) {
console.log(`[Light Force] ${i18n.darkDetected}`);
applyFilterInversion();
} else {
console.log(`[Light Force] ${i18n.lightDetected}`);
illuminateSpecificDarkAreas();
}
});
};
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', () => { setTimeout(detectAndFix, 50); });
} else {
setTimeout(detectAndFix, 50);
}
window.addEventListener('load', () => { setTimeout(detectAndFix, 200); });
const observer = new MutationObserver(() => {
clearTimeout(observer._timer);
observer._timer = setTimeout(() => {
flipThemeSignals();
if (!document.getElementById('light-force-invert')) {
requestAnimationFrame(() => {
if (isPageDark()) {
console.log(`[Light Force] ${i18n.dynamicDark}`);
applyFilterInversion();
} else {
illuminateSpecificDarkAreas();
}
});
}
}, 200);
});
if (document.documentElement) {
observer.observe(document.documentElement, {
attributes: true, childList: true, subtree: true, // Improved SPA support
attributeFilter: ['class', 'theme', 'data-theme', 'data-color-mode', 'style', 'data-bs-theme']
});
}
}
})();