(function () {
  'use strict';

  if (window.__DBC_SITE_V270__) return;
  window.__DBC_SITE_V270__ = true;

  const file = decodeURIComponent(window.location.pathname.split('/').pop() || 'index.html').toLowerCase();
  const family = document.body.dataset.v270Family || 'dbc';

  const clusters = {
    dbc: {
      identity: ['DBC / APPLICATION PLATFORM', 'DBC / APPLICATION PLATFORM'],
      links: [
        ['世界杯竞猜官网首页', 'DBC Home', 'index.html', ['index.html']],
        ['关于世界杯竞猜官网', 'About DBC', 'about.html', ['about.html']],
        ['品牌与业务生态', 'Brands & Businesses', 'about-brands.html', ['about-brands.html', 'casu.html', 'dpu.html', 'antux.html', 'ecoten.html']],
        ['联系与合作', 'Contact & Projects', 'contact.html', ['contact.html', 'contact-routing.html']]
      ],
      action: ['提交项目需求', 'Submit a project brief', 'contact.html']
    },
    bioten: {
      identity: ['BIOTEN / MATERIAL TO APPLICATION', 'BIOTEN / MATERIAL TO APPLICATION'],
      links: [
        ['平台总览', 'Platform', 'bioten-platform.html', ['bioten-platform.html']],
        ['PHA 水性材料', 'PHA waterborne materials', 'bioten-platform.html#method', []],
        ['应用方向', 'Application programs', 'bioten-platform.html#routes', ['bioten-agriculture.html', 'bioten-personal-care.html', 'bioten-waterborne-coatings.html', 'bioten-health-research.html']],
        ['研发与合作边界', 'R&D and collaboration scope', 'bioten-platform.html#evidence', []]
      ],
      action: ['提交应用与合作需求', 'Submit an application brief', 'contact.html?intent=bioten-platform']
    },
    packaging: {
      identity: ['BIOTEN PACKAGING / BARRIER SYSTEMS', 'BIOTEN PACKAGING / BARRIER SYSTEMS'],
      links: [
        ['包装总览', 'Packaging overview', 'bioten.html', ['bioten.html', 'bioten-packaging.html']],
        ['应用领域', 'Applications', 'bioten-packaging-applications.html', ['bioten-packaging-applications.html', 'solutions.html', 'solutions-food-packaging.html', 'solutions-industrial.html']],
        ['产品路线', 'Product routes', 'bioten-product-lines.html', ['bioten-product-lines.html', 'bioten-products.html', 'bioten-products-plus.html', 'bioten-products-pro.html', 'bioten-products-ultra.html', 'bioten-products-matrix.html']],
        ['工程与验证', 'Engineering and validation', 'bioten-lab.html', []]
      ],
      action: ['提交纸样与项目条件', 'Submit paper and project conditions', 'contact-intent-paper-sample.html']
    },
    developer: {
      identity: ['BIOTEN DEVELOPER / EVIDENCE WORKBENCH', 'BIOTEN DEVELOPER / EVIDENCE WORKBENCH'],
      links: [
        ['开发者工作台', 'Developer Workbench', 'bioten-lab.html', ['bioten-lab.html']],
        ['资料中心', 'Resources', 'resources.html', ['resources.html', 'resources-bioten-plus-brochure.html', 'resources-tds-sds.html', 'resources-reports.html', 'portal-login.html']],
        ['知识与标准', 'Knowledge & Standards', 'knowledge.html', ['knowledge.html', 'knowledge-barrier-standards.html', 'knowledge-compliance-map.html', 'knowledge-circularity.html', 'knowledge-faq.html']],
        ['项目预审', 'Project Intake', 'sample.html', ['sample.html', 'contact-from-bioten.html']],
        ['纸样测试', 'Paper Sample Test', 'contact-intent-paper-sample.html', ['contact-intent-paper-sample.html']]
      ],
      action: ['发起项目评估', 'Start project assessment', 'sample.html']
    },
    news: {
      identity: ['NEWSROOM / TRACEABLE PROGRESS', 'NEWSROOM / TRACEABLE PROGRESS'],
      links: [
        ['新闻总览', 'Newsroom', 'news.html', ['news.html']],
        ['重点进展', 'Featured Progress', 'news.html#observer-company', []],
        ['BIOTEN 进展', 'BIOTEN Updates', 'news.html#observer-company', []],
        ['公司动态', 'Company News', 'news-company.html', ['news-company.html']],
        ['行业洞察', 'Industry Insights', 'news-insights.html', ['news-insights.html']]
      ],
      action: ['回到项目与证据', 'Return to projects & evidence', 'bioten-lab.html']
    }
  };

  function makeLocalizedElement(tag, cn, en) {
    const element = document.createElement(tag);
    element.dataset.v270Cn = cn;
    element.dataset.v270En = en;
    element.textContent = cn;
    return element;
  }

  function applyLanguage() {
    const language = document.documentElement.dataset.lang === 'en' ? 'en' : 'cn';
    document.querySelectorAll('[data-v270-cn]').forEach(function (element) {
      const value = language === 'en' ? element.dataset.v270En : element.dataset.v270Cn;
      if (typeof value === 'string') element.textContent = value;
    });
    const context = document.querySelector('.v270-context');
    if (context) context.setAttribute('aria-label', language === 'en' ? 'Section navigation' : '当前板块导航');
  }

  function buildContextNavigation() {
    if (family === 'home') return;
    const main = document.querySelector('main');
    const cluster = clusters[family] || clusters.dbc;
    if (!main || !cluster || document.querySelector('.v270-context')) return;

    const nav = document.createElement('nav');
    nav.className = 'v270-context';
    nav.setAttribute('aria-label', '当前板块导航');

    const inner = document.createElement('div');
    inner.className = 'v270-context__inner';

    const identity = makeLocalizedElement('span', cluster.identity[0], cluster.identity[1]);
    identity.className = 'v270-context__identity';
    inner.appendChild(identity);

    const links = document.createElement('div');
    links.className = 'v270-context__links';
    cluster.links.forEach(function (item) {
      const link = makeLocalizedElement('a', item[0], item[1]);
      link.href = item[2];
      const owners = item[3] || [];
      if (owners.includes(file)) link.setAttribute('aria-current', 'page');
      if (family === 'news' && file.startsWith('news-') && item[2] === 'news.html') link.setAttribute('aria-current', 'page');
      links.appendChild(link);
    });
    inner.appendChild(links);

    const action = makeLocalizedElement('a', cluster.action[0], cluster.action[1]);
    action.className = 'v270-context__action';
    action.href = cluster.action[2];
    inner.appendChild(action);

    nav.appendChild(inner);
    main.parentNode.insertBefore(nav, main);
  }

  function enhanceDocumentLinks() {
    document.querySelectorAll('a[href]').forEach(function (link) {
      const href = String(link.getAttribute('href') || '').trim();
      if (!href) return;

      if (/\.pdf(?:[?#]|$)/i.test(href)) {
        link.target = '_blank';
        link.rel = 'noopener';
        link.classList.add('v270-pdf-link');
      }

      if (/^https?:\/\//i.test(href)) {
        try {
          const target = new URL(href, window.location.href);
          if (target.origin !== window.location.origin && link.target === '_blank') {
            const rel = new Set(String(link.rel || '').split(/\s+/).filter(Boolean));
            rel.add('noopener');
            rel.add('noreferrer');
            link.rel = Array.from(rel).join(' ');
          }
        } catch (error) {
          // Leave malformed legacy URLs untouched; the static verifier reports them.
        }
      }
    });
  }

  function markCurrentFooterRoute() {
    document.querySelectorAll('footer.site-footer a[href]').forEach(function (link) {
      const href = String(link.getAttribute('href') || '').split('#')[0].split('?')[0].toLowerCase();
      if (href && href === file) link.setAttribute('aria-current', 'page');
    });
  }

  function enhanceIllustrativeVisuals() {
    if (document.body.classList.contains('v400-site')) return;
    const illustrativeAssets = [
      'assets/images/bioten-engineering/hero-packaging',
      'assets/images/bioten-lab/platform-material-states',
      'assets/images/bioten-lab/application-formulation'
    ];
    document.querySelectorAll('main img[src]').forEach(function (image) {
      const src = String(image.getAttribute('src') || '');
      if (!illustrativeAssets.some(function (asset) { return src.includes(asset); })) return;
      const container = image.closest('figure, .v245-hero__media, .v245-flagship__media, .v245-tech-visual');
      if (!container || container.querySelector('.v270-visual-disclaimer')) return;
      const caption = document.createElement(container.tagName === 'FIGURE' ? 'figcaption' : 'div');
      caption.className = 'v270-visual-disclaimer';
      caption.dataset.v270Cn = '技术示意图｜用于解释材料、结构或应用逻辑，不作为产线、实验结果或客户项目证明。';
      caption.dataset.v270En = 'Technical illustration | Explains material, structure or application logic; not production-line, test-result or customer-project evidence.';
      caption.textContent = caption.dataset.v270Cn;
      container.appendChild(caption);
    });
  }

  function enhanceMobileFooter() {
    const footer = document.querySelector('footer.formal-site-footer');
    if (!footer) return;
    const columns = Array.from(footer.querySelectorAll('.footer-directory > .footer-column'));
    if (!columns.length) return;
    const mobileQuery = window.matchMedia('(max-width: 680px)');
    const currentColumnIndex = columns.findIndex(function (column) {
      return Boolean(column.querySelector('a[aria-current="page"]'));
    });

    columns.forEach(function (column, index) {
      column.classList.add('v270-footer-column');
      const heading = column.querySelector(':scope > h3');
      if (!heading || heading.querySelector('button')) return;
      const button = document.createElement('button');
      button.type = 'button';
      button.className = 'v270-footer-toggle';
      button.textContent = heading.textContent;
      ['data-nav-cn', 'data-nav-en'].forEach(function (name) {
        if (!heading.hasAttribute(name)) return;
        button.setAttribute(name, heading.getAttribute(name));
        heading.removeAttribute(name);
      });
      heading.textContent = '';
      heading.appendChild(button);
      if (index === (currentColumnIndex >= 0 ? currentColumnIndex : 0)) {
        column.classList.add('is-v270-open');
      }
      button.addEventListener('click', function () {
        if (!mobileQuery.matches) return;
        const willOpen = !column.classList.contains('is-v270-open');
        columns.forEach(function (item) { item.classList.remove('is-v270-open'); });
        if (willOpen) column.classList.add('is-v270-open');
        sync();
      });
    });

    function sync() {
      columns.forEach(function (column) {
        const button = column.querySelector('.v270-footer-toggle');
        if (!button) return;
        const expanded = !mobileQuery.matches || column.classList.contains('is-v270-open');
        button.setAttribute('aria-expanded', String(expanded));
      });
    }

    if (typeof mobileQuery.addEventListener === 'function') mobileQuery.addEventListener('change', sync);
    else if (typeof mobileQuery.addListener === 'function') mobileQuery.addListener(sync);
    sync();
  }

  function addMeasuredMotion() {
    if (family === 'home') return;
    if (!('IntersectionObserver' in window)) return;
    if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return;

    const candidates = Array.from(document.querySelectorAll('main > section:not([hidden])'))
      .filter(function (section) {
        return !section.classList.contains('v245-hero') && !section.classList.contains('news-business-panel');
      })
      .slice(0, 8);
    if (!candidates.length) return;

    document.documentElement.classList.add('v270-motion-ready');
    const observer = new IntersectionObserver(function (entries) {
      entries.forEach(function (entry) {
        if (!entry.isIntersecting) return;
        entry.target.classList.add('is-v270-visible');
        observer.unobserve(entry.target);
      });
    }, { threshold: .08, rootMargin: '0px 0px -6% 0px' });

    candidates.forEach(function (section) {
      section.dataset.v270Reveal = '';
      observer.observe(section);
      if (section.getBoundingClientRect().top < window.innerHeight * .92) {
        section.classList.add('is-v270-visible');
        observer.unobserve(section);
      }
    });
  }

  function markRelease() {
    const release = document.body.dataset.dbcRelease || document.documentElement.dataset.dbcRelease || 'v3.0.0';
    document.documentElement.dataset.dbcRelease = release;
    document.body.dataset.dbcRelease = release;
    document.body.classList.add('v270-enhanced');
    const footer = document.querySelector('footer.site-footer');
    if (footer) footer.dataset.dbcRelease = release;
  }

  buildContextNavigation();
  enhanceDocumentLinks();
  markCurrentFooterRoute();
  enhanceIllustrativeVisuals();
  enhanceMobileFooter();
  markRelease();
  applyLanguage();
  addMeasuredMotion();

  document.addEventListener('dbc:languagechange', applyLanguage);
  document.addEventListener('dbc:translations-loaded', applyLanguage);
})();