(function() {
        var btn = document.getElementById('lang-float');
        var menu = document.getElementById('lang-menu');
        var flagEl = document.getElementById('lang-current-flag');
        var codeEl = document.getElementById('lang-current-code');
        var items = document.querySelectorAll('.lang-item');

        function getCookie(name) {
            var m = document.cookie.match(new RegExp('(?:^|;\\s*)' + name + '=([^;]*)'));
            return m ? decodeURIComponent(m[1]) : null;
        }
        function setCookie(name, value, days) {
            var d = new Date();
            d.setTime(d.getTime() + (days * 24 * 60 * 60 * 1000));
            document.cookie = name + '=' + value + '; path=/; expires=' + d.toUTCString() + '; samesite=lax';
        }
        function getLang() {
            // Priority: URL param > cookie > 'en'
            var url = new URL(window.location.href);
            var p = url.searchParams.get('lang');
            if (p) return p;
            var c = getCookie('site_lang');
            if (c) return c;
            return 'en';
        }

        var T = null;
        var LANGS = null;

        var current = getLang();
        // Validate
        if (!T[current]) current = 'en';

        // Highlight current + set button label
        function paint() {
            for (var i = 0; i < items.length; i++) {
                var code = items[i].getAttribute('data-lang');
                if (code === current) {
                    items[i].classList.add('current');
                    flagEl.innerHTML = items[i].querySelector('.flag').innerHTML;
                    codeEl.textContent = code.toUpperCase();
                } else {
                    items[i].classList.remove('current');
                }
            }
            document.documentElement.lang = (current === 'zh') ? 'zh-CN' : (current === 'ja' ? 'ja' : current);
        }
        paint();

        // Click switch
        for (var i = 0; i < items.length; i++) {
            items[i].onclick = function(e) {
                e.preventDefault();
                var lang = this.getAttribute('data-lang');
                setCookie('site_lang', lang, 365);
                var url = new URL(window.location.href);
                url.searchParams.set('lang', lang);
                window.location.href = url.toString();
                return false;
            };
        }

        // Toggle menu
        btn.onclick = function(e) {
            e.stopPropagation();
            btn.classList.toggle('open');
            menu.classList.toggle('open');
        };
        document.addEventListener('click', function(e) {
            if (!btn.contains(e.target) && !menu.contains(e.target)) {
                btn.classList.remove('open');
                menu.classList.remove('open');
            }
        });
        document.addEventListener('keydown', function(e) {
            if (e.key === 'Escape') {
                btn.classList.remove('open');
                menu.classList.remove('open');
            }
        });

        // Translate page text
        function translatePage() {
            if (current === 'en') return; // No translation needed for English (source language)

            var dict = T[current];
            if (!dict) return;

            var walker = document.createTreeWalker(document.body, NodeFilter.SHOW_TEXT, {
                acceptNode: function(node) {
                    if (!node.nodeValue || !node.nodeValue.trim()) return NodeFilter.FILTER_REJECT;
                    var p = node.parentNode;
                    if (!p) return NodeFilter.FILTER_REJECT;
                    var tag = p.tagName;
                    if (tag === 'SCRIPT' || tag === 'STYLE' || tag === 'CODE' || tag === 'PRE' || tag === 'NOSCRIPT') return NodeFilter.FILTER_REJECT;
                    return NodeFilter.FILTER_ACCEPT;
                }
            });
            var node;
            while (node = walker.nextNode()) {
                var txt = node.nodeValue;
                var trimmed = txt.trim();
                if (!trimmed || trimmed.length > 250) continue;
                if (dict[trimmed]) {
                    node.nodeValue = txt.replace(trimmed, dict[trimmed]);
                }
            }

            if (dict[document.title]) document.title = dict[document.title];
        }

        if (document.readyState === 'complete') {
            translatePage();
        } else {
            window.addEventListener('load', function() {
                setTimeout(translatePage, 100);
            });
        }
    })();
    </script><?xml version="1.0" encoding="UTF-8"?>
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