function formatBeijingTime() {
  const d = new Date();
  // 转为北京时间 (UTC+8)
  const bj = new Date(d.getTime() + (8 * 60 * 60 * 1000));
  const Y = bj.getUTCFullYear();
  const M = String(bj.getUTCMonth() + 1).padStart(2, '0');
  const D = String(bj.getUTCDate()).padStart(2, '0');
  const h = String(bj.getUTCHours()).padStart(2, '0');
  const m = String(bj.getUTCMinutes()).padStart(2, '0');
  const s = String(bj.getUTCSeconds()).padStart(2, '0');
  const ms = String(bj.getUTCMilliseconds()).padStart(3, '0');
  return `${Y}-${M}-${D} ${h}:${m}:${s}.${ms} (UTC+8)`;
}
export default {
  async fetch(request, env, ctx) {
    const cf = request.cf || {};
    const url = new URL(request.url);
    const UA = request.headers.get('User-Agent') || '未知';
    const acceptLang = request.headers.get('Accept-Language') || '';

    // ===== 速度测试端点 =====
    if (url.pathname === '/speedtest') {
      // 返回 10MB 随机数据用于测速
      const size = 10 * 1024 * 1024; // 10MB
      const chunk = new Uint8Array(1024 * 64); // 64KB chunk
      let sent = 0;
      const stream = new ReadableStream({
        pull(controller) {
          if (sent >= size) {
            controller.close();
            return;
          }
          const toSend = Math.min(chunk.byteLength, size - sent);
          controller.enqueue(new Uint8Array(chunk.buffer, 0, toSend));
          sent += toSend;
        }
      });
      return new Response(stream, {
        headers: {
          'Content-Type': 'application/octet-stream',
          'Cache-Control': 'no-store',
          'Access-Control-Allow-Origin': '*',
        },
      });
    }

    // ===== 多语言判断 =====
    const prefersChinese = /zh|zh-CN|zh-TW|zh-HK/i.test(acceptLang);
    const lang = prefersChinese ? 'zh' : 'en';

    // ===== 获取客户端真实 IP =====
    const rawIP = request.headers.get('CF-Connecting-IP') || 
                  request.headers.get('X-Forwarded-For') || 
                  request.headers.get('X-Real-IP') || 
                  '未知';
    const clientIP = rawIP.split(',')[0].trim();
    const isIPv6 = clientIP.includes(':');
    const ipType = isIPv6 ? 'IPv6' : 'IPv4';

    // ===== VPS/客户端环境检测 =====
    const isTerminal = /curl|wget|python|go-http|libwww|okhttp|axios|node-fetch|requests/i.test(UA);
    const isBrowser = /Mozilla|Chrome|Safari|Firefox|Edge/i.test(UA) && !isTerminal;
    const isVPS = !isBrowser;

    // ===== 地理信息 =====
    const country = cf.country || '未知';
    const city = cf.city || '未知';
    const region = cf.region || '未知';
    const timezone = cf.timezone || 'UTC';
    const colo = cf.colo || '未知';
    const continent = cf.continent || '未知';
    const postalCode = cf.postalCode || '未知';
    const latitude = cf.latitude || '未知';
    const longitude = cf.longitude || '未知';

    // ===== 网络信息 =====
    const asOrganization = cf.asOrganization || `AS${cf.asn}` || '未知';
    const asn = cf.asn || '未知';
    const httpProtocol = cf.httpProtocol || 'HTTP/2';
    const tlsVersion = cf.tlsVersion || '未知';
    const tlsCipher = cf.tlsCipher || '未知';

    // ===== 客户端信息 =====
    const botScore = cf.botManagement?.score ?? 'N/A';
    const isTor = cf.isTor === true ? '是' : '否';
    const isEU = cf.isEUCountry === '1' ? '是' : '否';

    // ===== 判断环境类型 =====
    let envType, envIcon;
    if (isTerminal) {
      envType = lang === 'zh' ? '终端/命令行' : 'Terminal/CLI';
      envIcon = '💻';
    } else if (isBrowser) {
      envType = lang === 'zh' ? '浏览器' : 'Browser';
      envIcon = '🌐';
    } else {
      envType = lang === 'zh' ? 'VPS/服务器' : 'VPS/Server';
      envIcon = '🖥️';
    }

    // ===== 设备/系统判断 =====
    let os = '未知';
    if (/Windows/i.test(UA)) os = 'Windows';
    else if (/Mac OS/i.test(UA)) os = 'macOS';
    else if (/Linux/i.test(UA) && !/Android/i.test(UA)) os = 'Linux';
    else if (/Android/i.test(UA)) os = 'Android';
    else if (/iPhone|iPad|iOS/i.test(UA)) os = 'iOS';
    else if (/CrOS/i.test(UA)) os = 'ChromeOS';

    // ===== 反向地理编码 =====
    let geoAddress = null;
    if (latitude !== '未知' && longitude !== '未知') {
      try {
        const geoRes = await fetch(
          `https://nominatim.openstreetmap.org/reverse?lat=${latitude}&lon=${longitude}&format=json&zoom=14&accept-language=${lang === 'zh' ? 'zh' : 'en'}`,
          { headers: { 'User-Agent': 'CloudflareWorker/1.0' } }
        );
        if (geoRes.ok) {
          const geoData = await geoRes.json();
          geoAddress = geoData.display_name || null;
        }
      } catch (e) {
        geoAddress = null;
      }
    }

    // ===== 响应处理 =====
    if (isTerminal || isVPS) {
      const T = lang === 'zh' ? {
        title: '节点信息',
        domain: '访问域名',
        country: '访问国家/地区',
        city: '访问城市',
        region: '访问区域',
        continent: '访问大洲',
        postal: '邮政编码',
        coords: '经纬度',
        address: '具体地址',
        timezone: '时区',
        colo: 'Cloudflare 节点',
        network: '网络信息',
        ip: '客户端IP',
        asn: '运营商/ASN',
        tls: 'TLS 版本',
        cipher: 'TLS 加密套件',
        http: 'HTTP 协议',
        client: '客户端信息',
        env: '环境',
        os: '操作系统',
        ua: 'User-Agent',
        security: '安全信息',
        bot: '机器人评分',
        tor: '是否是 Tor',
        eu: '是否在欧盟',
        time: '查询时间',
      } : {
        title: 'Node Info',
        domain: 'Domain',
        country: 'Country',
        city: 'City',
        region: 'Region',
        continent: 'Continent',
        postal: 'Postal Code',
        coords: 'Coordinates',
        address: 'Address',
        timezone: 'Timezone',
        colo: 'CF Colo',
        network: 'Network',
        ip: 'Client IP',
        asn: 'ASN',
        tls: 'TLS Version',
        cipher: 'TLS Cipher',
        http: 'HTTP Protocol',
        client: 'Client',
        env: 'Environment',
        os: 'OS',
        ua: 'User-Agent',
        security: 'Security',
        bot: 'Bot Score',
        tor: 'Tor',
        eu: 'EU',
        time: 'Query Time',
      };

      const text = [
        `🔍 ${T.title} - ${url.hostname}`,
        ``,
        `🌍 ${T.domain}: ${url.hostname}`,
        `📍 ${T.country}: ${country}`,
        `🏙️ ${T.city}: ${city}`,
        `🏛️ ${T.region}: ${region}`,
        `🗺️ ${T.continent}: ${continent}`,
        `📮 ${T.postal}: ${postalCode}`,
        `🌐 ${T.coords}: ${latitude}, ${longitude}`,
        ...(geoAddress ? [`📍 ${T.address}: ${geoAddress}`] : []),
        `🕐 ${T.timezone}: ${timezone}`,
        `🖥️ ${T.colo}: ${colo}`,
        ``,
        `📡 ${T.network}:`,
        `🔗 ${T.ip}: ${clientIP} (${ipType})`,
        `🏢 ${T.asn}: ${asOrganization} (AS${asn})`,
        `🔒 ${T.tls}: ${tlsVersion}`,
        `🔑 ${T.cipher}: ${tlsCipher}`,
        `📶 ${T.http}: ${httpProtocol}`,
        ``,
        `🖥️ ${T.client}:`,
        `🔍 ${T.env}: ${envType}`,
        `💿 ${T.os}: ${os}`,
        `🧠 ${T.ua}: ${UA}`,
        ``,
        `🛡️ ${T.security}:`,
        `🤖 ${T.bot}: ${botScore}`,
        `🌐 ${T.tor}: ${isTor}`,
        `🇪🇺 ${T.eu}: ${isEU}`,
        ``,
        `⏰ ${T.time}: ${formatBeijingTime()}`,
      ].join('\n');
      return new Response(text, {
        headers: { 'Content-Type': 'text/plain; charset=utf-8' },
      });
    }

    // 浏览器返回 HTML
    const html = generateHTML({
      hostname: url.hostname, clientIP, ipType, country, city, region,
      continent, postalCode, latitude, longitude, timezone, colo,
      asOrganization, asn, httpProtocol, tlsVersion, tlsCipher,
      botScore, isTor, isEU, envType, envIcon, os, UA, geoAddress, lang,
    });

    return new Response(html, {
      headers: { 'Content-Type': 'text/html; charset=utf-8' },
    });
  },
};

function esc(str) {
  return String(str).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;').replace(/'/g,'&#39;');
}

function generateHTML(data) {
  const {
    hostname, clientIP, ipType, country, city, region,
    continent, postalCode, latitude, longitude, timezone, colo,
    asOrganization, asn, httpProtocol, tlsVersion, tlsCipher,
    botScore, isTor, isEU, envType, envIcon, os, UA, geoAddress, lang,
  } = data;

  const hasCoords = latitude !== '未知' && longitude !== '未知';

  const T = lang === 'zh' ? {
    title: '节点信息',
    subtitle: 'Cloudflare Workers',
    location: '📍 位置信息',
    domain: '🌍 域名',
    country: '🏳️ 国家/地区',
    city: '🏙️ 城市',
    region: '🏛️ 区域',
    continent: '🗺️ 大洲',
    postal: '📮 邮政编码',
    address: '📍 具体地址',
    coords: '🌐 经纬度',
    viewMap: '🗺️ 在 Google Maps 查看',
    timezone: '🕐 时区',
    colo: '🖥️ CF 节点',
    ipTitle: '🌐 IP 地址',
    cfIP: '☁️ CF 连接 IP',
    browserIPv4: '🌐 浏览器 IPv4',
    browserIPv6: '🌐 浏览器 IPv6',
    detecting: '检测中...',
    noIPv4: '无 IPv4',
    noIPv6: '无 IPv6',
    networkTitle: '📡 网络信息',
    asn: '🏢 运营商/ASN',
    tls: '🔒 TLS 版本',
    cipher: '🔑 TLS 加密',
    http: '📶 HTTP 协议',
    clientTitle: '🖥️ 客户端',
    env: '🔍 环境',
    os: '💿 操作系统',
    ua: '🧠 User-Agent',
    securityTitle: '🛡️ 安全',
    bot: '🤖 机器人评分',
    tor: '🌐 Tor',
    eu: '🇪🇺 欧盟',
    speedTitle: '⚡ 网络测速',
    latency: '🕐 延迟（RTT）',
    download: '📥 下载速度',
    testing: '测试中...',
    startTest: '▶️ 开始测速',
    testing2: '测试中...',
    copied: '✅ 已复制',
    copy: '📋 复制',
    footer: '查询时间',
  } : {
    title: 'Node Info',
    subtitle: 'Cloudflare Workers',
    location: '📍 Location',
    domain: '🌍 Domain',
    country: '🏳️ Country',
    city: '🏙️ City',
    region: '🏛️ Region',
    continent: '🗺️ Continent',
    postal: '📮 Postal Code',
    address: '📍 Address',
    coords: '🌐 Coordinates',
    viewMap: '🗺️ View on Google Maps',
    timezone: '🕐 Timezone',
    colo: '🖥️ CF Colo',
    ipTitle: '🌐 IP Address',
    cfIP: '☁️ CF Connecting IP',
    browserIPv4: '🌐 Browser IPv4',
    browserIPv6: '🌐 Browser IPv6',
    detecting: 'Detecting...',
    noIPv4: 'No IPv4',
    noIPv6: 'No IPv6',
    networkTitle: '📡 Network',
    asn: '🏢 ASN',
    tls: '🔒 TLS Version',
    cipher: '🔑 TLS Cipher',
    http: '📶 HTTP Protocol',
    clientTitle: '🖥️ Client',
    env: '🔍 Environment',
    os: '💿 OS',
    ua: '🧠 User-Agent',
    securityTitle: '🛡️ Security',
    bot: '🤖 Bot Score',
    tor: '🌐 Tor',
    eu: '🇪🇺 EU',
    speedTitle: '⚡ Speed Test',
    latency: '🕐 Latency (RTT)',
    download: '📥 Download Speed',
    testing: 'Testing...',
    startTest: '▶️ Start Test',
    testing2: 'Testing...',
    copied: '✅ Copied',
    copy: '📋 Copy',
    footer: 'Query Time',
  };

  return `<!DOCTYPE html>
<html lang="${lang === 'zh' ? 'zh-CN' : 'en'}">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>${T.title}</title>
  <style>
    :root {
      --bg: #0d1117;
      --card: #161b22;
      --border: #30363d;
      --text: #c9d1d9;
      --muted: #8b949e;
      --accent: #58a6ff;
      --green: #3fb950;
      --orange: #d2991d;
      --red: #f85149;
      --purple: #a371f7;
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
      background: var(--bg);
      color: var(--text);
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 40px 16px;
    }
    .container { max-width: 780px; width: 100%; }
    .header {
      text-align: center;
      margin-bottom: 32px;
    }
    .header h1 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .header .subtitle {
      color: var(--muted);
      font-size: 14px;
      font-family: monospace;
    }
    .badge {
      display: inline-block;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
      margin: 6px 4px;
    }
    .badge-ipv4 { background: rgba(88,166,255,0.15); color: var(--accent); }
    .badge-ipv6 { background: rgba(163,113,247,0.15); color: var(--purple); }
    .badge-env { background: rgba(63,185,80,0.15); color: var(--green); }
    .badge-lang {
      background: rgba(210,153,29,0.15); color: var(--orange);
      cursor: pointer;
      text-decoration: none;
      transition: opacity 0.2s;
    }
    .badge-lang:hover { opacity: 0.8; }

    .card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 24px;
      margin-bottom: 20px;
    }
    .card-title {
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .row {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      padding: 10px 0;
      border-bottom: 1px solid rgba(48,54,61,0.5);
      gap: 12px;
    }
    .row:last-child { border-bottom: none; }
    .label {
      color: var(--muted);
      font-size: 13px;
      white-space: nowrap;
      flex-shrink: 0;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .value {
      font-size: 14px;
      text-align: right;
      word-break: break-all;
      font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
      justify-content: flex-end;
    }
    .value.highlight { color: var(--accent); font-weight: 600; }
    .value.address {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      line-height: 1.5;
    }
    .map-link {
      display: inline-block;
      margin-top: 4px;
      color: var(--accent);
      text-decoration: none;
      font-size: 12px;
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    }
    .map-link:hover { text-decoration: underline; }

    /* 复制按钮 */
    .copy-btn {
      background: transparent;
      border: 1px solid var(--border);
      color: var(--muted);
      cursor: pointer;
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 11px;
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      white-space: nowrap;
      transition: all 0.2s;
      flex-shrink: 0;
    }
    .copy-btn:hover {
      border-color: var(--accent);
      color: var(--accent);
    }
    .copy-btn.copied {
      border-color: var(--green);
      color: var(--green);
    }

    /* 测速按钮 */
    .speed-btn {
      background: rgba(88,166,255,0.12);
      border: 1px solid rgba(88,166,255,0.3);
      color: var(--accent);
      cursor: pointer;
      padding: 6px 16px;
      border-radius: 6px;
      font-size: 13px;
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      transition: all 0.2s;
      font-weight: 500;
    }
    .speed-btn:hover { background: rgba(88,166,255,0.2); }
    .speed-btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }
    .speed-result {
      font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
      font-size: 14px;
      color: var(--green);
      font-weight: 600;
    }
    .speed-result.warn { color: var(--orange); }
    .speed-result.bad { color: var(--red); }

    .footer {
      text-align: center;
      color: var(--muted);
      font-size: 12px;
      margin-top: 20px;
    }

    @media (max-width: 500px) {
      body { padding: 20px 10px; }
      .card { padding: 16px; }
      .row { flex-direction: column; align-items: flex-start; gap: 4px; }
      .value { text-align: left; justify-content: flex-start; }
    }
  </style>
</head>
<body>
  <div class="container">
      <div style="display:flex; justify-content:center; margin-bottom:20px;">
      <div id="live-clock-wrap" style="
        display:inline-flex; align-items:center; gap:8px;
        background:rgba(255,255,255,0.04);
        border:1px solid rgba(255,255,255,0.08);
        border-radius:40px;
        padding:8px 22px;
        backdrop-filter:blur(12px);
        -webkit-backdrop-filter:blur(12px);
        box-shadow:0 0 24px rgba(99,102,241,0.15), inset 0 0 12px rgba(99,102,241,0.06);
      ">
        <span style="font-size:16px;">🕐</span>
        <span style="font-size:12px; font-weight:500; color:var(--secondary); letter-spacing:1px;">北京时间</span>
        <span id="live-clock" style="font-size:17px; font-weight:700; color:var(--accent); font-family:'SF Mono','Fira Code','Consolas',monospace; letter-spacing:1px; text-shadow:0 0 12px rgba(99,102,241,0.5); min-width:190px;">--</span>
      </div>
    </div>
    <div class="header">
      <h1>🔍 ${T.title}</h1>
      
      <span class="badge badge-${ipType === 'IPv6' ? 'ipv6' : 'ipv4'}">CF: ${ipType}</span>
      <span class="badge badge-env">${envIcon} ${esc(envType)}</span>
      <a class="badge badge-lang" href="?lang=${lang === 'zh' ? 'en' : 'zh'}" title="Switch Language">${lang === 'zh' ? '🌐 EN' : '🌐 中文'}</a>
    </div>

    <!-- 位置信息 -->
    <div class="card">
      <div class="card-title">${T.location}</div>
      <div class="row">
        <span class="label">${T.country}</span>
        <span class="value">${esc(country)} <button class="copy-btn" onclick="copyText('${esc(country)}',this)">${T.copy}</button></span>
      </div>
      <div class="row"><span class="label">${T.city}</span><span class="value">${esc(city)}</span></div>
      <div class="row"><span class="label">${T.region}</span><span class="value">${esc(region)}</span></div>
      <div class="row"><span class="label">${T.continent}</span><span class="value">${esc(continent)}</span></div>
      <div class="row"><span class="label">${T.postal}</span><span class="value">${esc(postalCode)}</span></div>
      ${geoAddress ? `
      <div class="row">
        <span class="label">${T.address}</span>
        <span class="value address">${esc(geoAddress)} <button class="copy-btn" onclick="copyText('${esc(geoAddress.replace(/'/g, "\\'"))}',this)">${T.copy}</button></span>
      </div>` : ''}
      <div class="row">
        <span class="label">${T.coords}</span>
        <span class="value">
          ${latitude}, ${longitude}
          <button class="copy-btn" onclick="copyText('${latitude},${longitude}',this)">${T.copy}</button>
          ${hasCoords ? `<br><a class="map-link" href="https://www.google.com/maps?q=${latitude},${longitude}" target="_blank" rel="noopener">${T.viewMap}</a>` : ''}
        </span>
      </div>
      <div class="row"><span class="label">${T.timezone}</span><span class="value">${esc(timezone)}</span></div>
      <div class="row"><span class="label">${T.colo}</span><span class="value highlight">${esc(colo)}</span></div>
    </div>

    <!-- IP 信息 -->
    <div class="card">
      <div class="card-title">${T.ipTitle}</div>
      <div class="row">
        <span class="label">${T.cfIP}</span>
        <span class="value highlight">${esc(clientIP)} (${ipType}) <button class="copy-btn" onclick="copyText('${esc(clientIP)}',this)">${T.copy}</button></span>
      </div>
      <div class="row">
        <span class="label">${T.browserIPv4}</span>
        <span class="value" id="ipv4-address">${T.detecting}</span>
      </div>
      <div class="row">
        <span class="label">${T.browserIPv6}</span>
        <span class="value" id="ipv6-address">${T.detecting}</span>
      </div>
    </div>

    <!-- 网络信息 -->
    <div class="card">
      <div class="card-title">${T.networkTitle}</div>
      <div class="row"><span class="label">${T.asn}</span><span class="value">${esc(asOrganization)} (AS${asn})</span></div>
      <div class="row"><span class="label">${T.tls}</span><span class="value">${esc(tlsVersion)}</span></div>
      <div class="row"><span class="label">${T.cipher}</span><span class="value" style="font-size:11px;">${esc(tlsCipher)}</span></div>
      <div class="row"><span class="label">${T.http}</span><span class="value">${esc(httpProtocol)}</span></div>
    </div>

    <!-- 客户端信息 -->
    <div class="card">
      <div class="card-title">${T.clientTitle}</div>
      <div class="row"><span class="label">${T.env}</span><span class="value">${envIcon} ${esc(envType)}</span></div>
      <div class="row"><span class="label">${T.os}</span><span class="value">${esc(os)}</span></div>
      <div class="row"><span class="label">${T.ua}</span><span class="value" style="font-size:11px;">${esc(UA)}</span></div>
    </div>

    <!-- 安全信息 -->
    <div class="card">
      <div class="card-title">${T.securityTitle}</div>
      <div class="row"><span class="label">${T.bot}</span><span class="value">${botScore}</span></div>
      <div class="row"><span class="label">${T.tor}</span><span class="value">${isTor}</span></div>
      <div class="row"><span class="label">${T.eu}</span><span class="value">${isEU}</span></div>
    </div>

    <!-- 小工具 -->
    <div class="card">
      <div class="card-title">${T.tool}</div>
      <div class="row"><span class="label">${T.startTest}</span><span class="value">${botScore}</span></div>
    </div>

    <!-- 测速 -->
    <div class="card">
      <div class="card-title">${T.speedTitle}</div>
      <div class="row">
        <span class="label">${T.latency}</span>
        <span class="value" id="latency-result">-</span>
      </div>
      <div class="row">
        <span class="label">${T.download}</span>
        <span class="value" id="speed-result">-</span>
      </div>
      <div class="row">
        <span class="label"></span>
        <span class="value"><button class="speed-btn" id="speed-btn" onclick="runSpeedTest()">${T.startTest}</button></span>
      </div>
    </div>

    <div class="footer">
      ⏰ ${T.footer}: ${formatBeijingTime()} · Powered by Cloudflare Workers
    </div>
  </div>

  <script>
    // ===== 获取浏览器 IP =====
    async function fetchIP() {
      const ipv4El = document.getElementById('ipv4-address');
      const ipv6El = document.getElementById('ipv6-address');

      try {
        const v4Res = await fetch('https://api.ipify.org?format=json');
        const v4Data = await v4Res.json();
        ipv4El.textContent = v4Data.ip;
        ipv4El.classList.add('highlight');
        // 加复制按钮
        const btn = document.createElement('button');
        btn.className = 'copy-btn';
        btn.textContent = '${T.copy}';
        btn.onclick = function(){ copyText(v4Data.ip, btn); };
        ipv4El.appendChild(btn);
      } catch (e) {
        ipv4El.textContent = '${T.noIPv4}';
        ipv4El.style.color = 'var(--muted)';
      }

      try {
        const v6Res = await fetch('https://api6.ipify.org?format=json');
        const v6Data = await v6Res.json();
        ipv6El.textContent = v6Data.ip;
        ipv6El.classList.add('highlight');
        const btn = document.createElement('button');
        btn.className = 'copy-btn';
        btn.textContent = '${T.copy}';
        btn.onclick = function(){ copyText(v6Data.ip, btn); };
        ipv6El.appendChild(btn);
      } catch (e) {
        ipv6El.textContent = '${T.noIPv6}';
        ipv6El.style.color = 'var(--muted)';
      }
    }
    fetchIP();

    // ===== 复制功能 =====
    function copyText(text, btn) {
      navigator.clipboard.writeText(text).then(() => {
        const original = btn.textContent;
        btn.textContent = '${T.copied}';
        btn.classList.add('copied');
        setTimeout(() => {
          btn.textContent = original;
          btn.classList.remove('copied');
        }, 1500);
      }).catch(() => {
        // fallback
        const ta = document.createElement('textarea');
        ta.value = text;
        ta.style.position = 'fixed';
        ta.style.opacity = '0';
        document.body.appendChild(ta);
        ta.select();
        document.execCommand('copy');
        document.body.removeChild(ta);
        const original = btn.textContent;
        btn.textContent = '${T.copied}';
        btn.classList.add('copied');
        setTimeout(() => {
          btn.textContent = original;
          btn.classList.remove('copied');
        }, 1500);
      });
    }

    // ===== 测速功能 =====
    async function runSpeedTest() {
      const btn = document.getElementById('speed-btn');
      const latencyEl = document.getElementById('latency-result');
      const speedEl = document.getElementById('speed-result');

      btn.disabled = true;
      btn.textContent = '${T.testing2}';
      latencyEl.textContent = '${T.testing}';
      latencyEl.className = 'value';
      speedEl.textContent = '${T.testing}';
      speedEl.className = 'value';

      // --- 延迟测试：测 5 次取平均 ---
      let totalRTT = 0;
      const pingCount = 5;
      for (let i = 0; i < pingCount; i++) {
        const start = performance.now();
        try {
          await fetch(window.location.origin + '/?nocache=' + Math.random(), { method: 'HEAD', cache: 'no-store' });
        } catch(e) {}
        const end = performance.now();
        totalRTT += (end - start);
      }
      const avgRTT = Math.round(totalRTT / pingCount);

      // 显示延迟
      let rttClass = '';
      if (avgRTT < 50) rttClass = 'speed-result';
      else if (avgRTT < 150) rttClass = 'speed-result warn';
      else rttClass = 'speed-result bad';
      latencyEl.textContent = avgRTT + ' ms';
      latencyEl.className = 'value ' + rttClass;

      // --- 下载速度测试 ---
      const testUrl = window.location.origin + '/speedtest?nocache=' + Math.random();
      const startTime = performance.now();
      let totalBytes = 0;

      try {
        const response = await fetch(testUrl, { cache: 'no-store' });
        const reader = response.body.getReader();

        // 最多测 5 秒
        const maxDuration = 5000;
        const startedAt = Date.now();

        while (true) {
          const { done, value } = await reader.read({});
          if (done) break;
          totalBytes += value.byteLength;
          if (Date.now() - startedAt >= maxDuration) {
            reader.cancel();
            break;
          }
        }

        const endTime = performance.now();
        const durationSec = (endTime - startTime) / 1000;
        const speedMbps = ((totalBytes * 8) / durationSec / 1000000).toFixed(2);
        const speedMBs = (totalBytes / durationSec / 1000000).toFixed(2);

        let speedClass = '';
        if (speedMbps >= 50) speedClass = 'speed-result';
        else if (speedMbps >= 10) speedClass = 'speed-result warn';
        else speedClass = 'speed-result bad';

        speedEl.textContent = speedMBs + ' MB/s (' + speedMbps + ' Mbps)';
        speedEl.className = 'value ' + speedClass;

      } catch(e) {
        speedEl.textContent = 'Test failed';
        speedEl.className = 'value bad';
      }

      btn.disabled = false;
      btn.textContent = T.startTest;
    }

    


    // ===== 实时北京时间 =====
    function updateClock() {
     const now = new Date();
     const Y = now.getFullYear();
     const M = String(now.getMonth() + 1).padStart(2, '0');
     const D = String(now.getDate()).padStart(2, '0');
     const h = String(now.getHours()).padStart(2, '0');
     const m = String(now.getMinutes()).padStart(2, '0');
     const s = String(now.getSeconds()).padStart(2, '0');
     const ms = String(now.getMilliseconds()).padStart(3, '0');
     const el = document.getElementById('live-clock');
     if (!el) return;
     el.innerHTML = Y + '-' + M + '-' + D + ' ' + h + ':' + m + ':' + s + '<span style="font-size:12px;opacity:0.5;font-weight:500;">.' + ms + '</span>';
}
     
  </script>
</body>
</html>`;
}