(() => {
  const $ = (sel) => document.querySelector(sel);
  const fromEl = $('#from');
  const toEl = $('#to');
  const tripsEl = $('#trips');
  const priceBox = $('#priceBox');
  const voucherBox = $('#voucherBox');
  let previewSeq = 0;
  let lastPreviewKey = '';

  const api = {
    fareQuery: async (from, to) => {
      const r = await fetch(`/api/public/fares/query?from=${encodeURIComponent(from)}&to=${encodeURIComponent(to)}`);
      return r.json();
    },
    createOrder: async (payload) => {
      const r = await fetch('/api/public/orders', { method:'POST', headers:{ 'Content-Type':'application/json' }, body: JSON.stringify(payload) });
      return r.json();
    }
  };

  // Fetch and Render Map
  const mapContainer = $('#stationMap');
  let selection = [null, null];
  let currentRoute = [];
  let currentRouteTransfers = [];
  let stationNameByCode = {};
  let stationEnByCode = {};
  let stationCanonicalByCode = {};
  let stationCodesByCanonical = {};
  let stationXByCanonical = {};
  let stationYByCanonical = {};
  let stationTransfer = new Set();
  
  // TVM UI State
  let activeLineId = null;
  let allLinesData = [];
  let allStationsData = [];
  
  async function renderSystemMap() {
      mapContainer.innerHTML = '<div class="loading">加载线路数据...</div>';
      try {
          const [linesData, stationsData] = await Promise.all([
              fetch('/api/public/lines').then(r=>r.json()),
              fetch('/api/public/stations').then(r=>r.json())
          ]);

          window.cachedStationsData = stationsData;
          allLinesData = linesData;
          allStationsData = stationsData;
          
          stationTransfer = new Set();
          stationCanonicalByCode = {};
          stationCodesByCanonical = {};
          stationNameByCode = {};
          stationEnByCode = {};
          
          for (const s of stationsData) {
              const code = String(s.code || s.编号 || '').trim();
              if (!code) continue;
              stationNameByCode[code] = String(s.name || s.名称 || code);
              stationEnByCode[code] = String(s.en_name || s.英文名 || '');
          }

          const transferGroups = buildTransferGroups(stationsData);
          stationCanonicalByCode = transferGroups.canonicalByCode;
          stationCodesByCanonical = transferGroups.codesByCanonical;
          for (const codes of Object.values(stationCodesByCanonical)) {
              if (codes.length >= 2) codes.forEach(code => stationTransfer.add(code));
          }

          const linesByStation = new Map();
          for (let i = 0; i < linesData.length; i++) {
              const line = linesData[i] || {};
              const stopsRaw = Array.isArray(line.stops) ? line.stops : (Array.isArray(line.站点列表) ? line.站点列表 : []);
              const stops = stopsRaw.map(c => String(c || '').trim()).filter(Boolean);
              for (const c of stops) {
                  if (c === '-') continue;
                  const arr = linesByStation.get(c) || [];
                  arr.push(line);
                  linesByStation.set(c, arr);
              }
          }

          for (const [c, arr] of linesByStation.entries()) {
              const uniq = Array.from(new Set(arr.map(l => l.id)));
              if (uniq.length >= 2) stationTransfer.add(c);
          }
          
          // Select first line by default if none selected
          if (!activeLineId && allLinesData.length > 0) {
              activeLineId = allLinesData[0].id;
          }

          renderTvmUI();
          
      } catch(e) {
          console.error(e);
          mapContainer.innerHTML = '<div class="error">数据加载失败</div>';
      }
  }
  
  function renderTvmUI() {
      if (!allLinesData || allLinesData.length === 0) {
          mapContainer.innerHTML = '<div class="empty-state jr-empty-state"><p>暂无可显示的线路数据。</p></div>';
          return;
      }

      const nodeSlotWidth = window.innerWidth <= 768 ? 58 : 70;
      const trackPadding = Math.round(nodeSlotWidth / 2);

      // 1. Render Line Tabs
      let tabsHtml = `<div class="tvm-lines-nav" style="display: flex; gap: 8px; overflow-x: auto; padding: 12px; background: var(--surface-color, #f8fafc); border-bottom: 1px solid var(--border-color, #e2e8f0); border-radius: 12px 12px 0 0; -webkit-overflow-scrolling: touch; scrollbar-width: none;">`;
      allLinesData.forEach(line => {
          const color = line.color || '#94a3b8';
          const isActive = String(line.id) === String(activeLineId);
          const bg = isActive ? color : 'var(--bg-color, #ffffff)';
          const fg = isActive ? '#ffffff' : 'var(--text-color, #334155)';
          const border = isActive ? color : 'var(--border-color, #cbd5e1)';
          tabsHtml += `
            <button class="tvm-line-tab" onclick="window.switchTvmLine('${line.id}')" style="
                flex-shrink: 0; 
                padding: 8px 16px; 
                border-radius: 20px; 
                border: 2px solid ${border}; 
                background: ${bg}; 
                color: ${fg}; 
                font-weight: 700; 
                font-size: 14px; 
                cursor: pointer;
                transition: all 0.2s ease;
                display: flex;
                align-items: center;
                gap: 6px;
                box-shadow: ${isActive ? '0 2px 4px rgba(0,0,0,0.1)' : 'none'};
                white-space: nowrap;
            ">
                <span style="width: 10px; height: 10px; border-radius: 50%; background: ${isActive ? 'var(--bg-color, #fff)' : color}; display: inline-block;"></span>
                ${line.name || line.线路名称 || '未知线路'}
            </button>
          `;
      });
      tabsHtml += `</div>`;

      // 2. Render Stations for Active Line
      const activeLine = allLinesData.find(l => String(l.id) === String(activeLineId)) || allLinesData[0];
      const stopsRaw = Array.isArray(activeLine.stops) ? activeLine.stops : (Array.isArray(activeLine.站点列表) ? activeLine.站点列表 : []);
      const stops = stopsRaw.map(c => String(c || '').trim()).filter(Boolean);
      const visibleStops = stops.filter(code => code !== '-');
      
      let stationsHtml = `<div class="tvm-stations-line-container" style="overflow-x: auto; padding: 40px 20px 20px 20px; background: var(--bg-color, #ffffff); border-radius: 0 0 12px 12px; -webkit-overflow-scrolling: touch; scrollbar-width: thin;">`;
      
      stationsHtml += `<div style="display: flex; position: relative; min-width: max-content; align-items: flex-start;">`;
      
      stationsHtml += `<div style="position: absolute; top: 14px; left: ${trackPadding}px; right: ${trackPadding}px; height: 8px; background-color: ${activeLine.color || '#94a3b8'}; border-radius: 4px; z-index: 1;"></div>`;

      const getVisibleStopIndex = (targetCode) => {
          const targetCanonical = stationCanonicalByCode[String(targetCode || '').trim()] || String(targetCode || '').trim();
          return visibleStops.findIndex(code => (stationCanonicalByCode[code] || code) === targetCanonical);
      };

      const fromIndex = getVisibleStopIndex(selection[0]);
      const toIndex = getVisibleStopIndex(selection[1]);
      const sameLineSelection = fromIndex >= 0
          && toIndex >= 0
          && selection[0]
          && selection[1]
          && (!Array.isArray(currentRouteTransfers) || currentRouteTransfers.length === 0);

      if (sameLineSelection) {
          const startIndex = Math.min(fromIndex, toIndex);
          const endIndex = Math.max(fromIndex, toIndex);
          const left = (startIndex * nodeSlotWidth) + trackPadding;
          const width = Math.max((endIndex - startIndex) * nodeSlotWidth, 0);
          const arrowCount = Math.max(1, Math.floor(width / 40));
          let arrowsHtml = '';
          for (let i = 0; i < arrowCount; i++) {
              arrowsHtml += `<span style="font-size: 16px; line-height: 1; color: #854d0e; font-weight: 800;">›</span>`;
          }
          stationsHtml += `
            <div style="
                position: absolute;
                top: 14px;
                left: ${left}px;
                width: ${width}px;
                height: 8px;
                background: linear-gradient(90deg, rgba(250,204,21,0.92) 0%, #facc15 100%);
                border-radius: 999px;
                z-index: 2;
                box-shadow: 0 0 0 2px rgba(255,255,255,0.85), 0 4px 12px rgba(250, 204, 21, 0.35);
                overflow: visible;
            ">
                <div style="
                    position: absolute;
                    inset: -7px 8px auto 8px;
                    display: flex;
                    align-items: center;
                    justify-content: space-around;
                    pointer-events: none;
                ">${arrowsHtml}</div>
            </div>
          `;
      }

      let hasStations = false;
      stops.forEach(code => {
          if (code === '-') return; 
          hasStations = true;
          
          const name = stationNameByCode[code] || code;
          const enName = stationEnByCode[code] || '';
          
          const isSelectedFrom = selection[0] === code;
          const isSelectedTo = selection[1] === code;
          const inRoute = Array.isArray(currentRoute) && currentRoute.includes(code);
          
          // Check transfers
          const canonical = stationCanonicalByCode[code] || code;
          const codesInGroup = stationCodesByCanonical[canonical] || [canonical];
          const linesForThisStation = new Set();
          codesInGroup.forEach(c => {
              allLinesData.forEach(l => {
                  const lStops = Array.isArray(l.stops) ? l.stops : (Array.isArray(l.站点列表) ? l.站点列表 : []);
                  if (lStops.includes(c)) linesForThisStation.add(l);
              });
          });
          
          const transferLines = Array.from(linesForThisStation).filter(l => String(l.id) !== String(activeLineId));
          const isTransfer = transferLines.length > 0;

          let nodeColor = activeLine.color || '#94a3b8';
          let nodeSize = isTransfer ? '20px' : '14px';
          let nodeBorder = isTransfer ? '4px' : '3px';
          let badgeHtml = '';
          
          if (isSelectedFrom) {
              nodeColor = 'var(--success, #16a34a)';
              nodeSize = '24px';
              badgeHtml = `<div style="position: absolute; top: -32px; background: var(--success, #16a34a); color: white; font-size: 11px; padding: 2px 6px; border-radius: 4px; font-weight: bold; white-space: nowrap; box-shadow: 0 2px 4px rgba(0,0,0,0.2); z-index: 10;">起点</div>`;
          } else if (isSelectedTo) {
              nodeColor = 'var(--danger, #dc2626)';
              nodeSize = '24px';
              badgeHtml = `<div style="position: absolute; top: -32px; background: var(--danger, #dc2626); color: white; font-size: 11px; padding: 2px 6px; border-radius: 4px; font-weight: bold; white-space: nowrap; box-shadow: 0 2px 4px rgba(0,0,0,0.2); z-index: 10;">终点</div>`;
          } else if (inRoute) {
              nodeColor = 'var(--primary, #facc15)';
              if (!isTransfer) nodeSize = '18px';
              else nodeSize = '24px';
          }

          let transferDotsHtml = '';
          if (isTransfer) {
              transferDotsHtml = `<div style="display: flex; gap: 3px; position: absolute; top: -14px;">`;
              transferLines.slice(0, 3).forEach(l => {
                  transferDotsHtml += `<div title="可换乘 ${l.name}" style="width: 8px; height: 8px; border-radius: 50%; background: ${l.color || '#999'}; border: 1px solid #fff; box-shadow: 0 1px 2px rgba(0,0,0,0.2);"></div>`;
              });
              transferDotsHtml += `</div>`;
          }

          stationsHtml += `
            <div class="tvm-station-node" onclick="window.handleStationClick('${code}')" style="
                position: relative;
                z-index: 2;
                display: flex;
                flex-direction: column;
                align-items: center;
                 width: ${nodeSlotWidth}px;
                flex-shrink: 0;
                cursor: pointer;
             ">
                
                <!-- Fixed height container for vertical alignment of the track nodes -->
                <div style="height: 36px; display: flex; align-items: center; justify-content: center; position: relative; width: 100%;">
                    ${badgeHtml}
                    ${transferDotsHtml}
                    <div style="
                        width: ${nodeSize};
                        height: ${nodeSize};
                        border-radius: 50%;
                        background: #fff;
                        border: ${nodeBorder} solid ${nodeColor};
                        box-shadow: 0 2px 4px rgba(0,0,0,0.1);
                        z-index: 2;
                        transition: all 0.2s;
                    "></div>
                </div>
                
                <!-- Labels -->
                <div style="text-align: center; margin-top: 8px; width: 100%; display: flex; flex-direction: column; align-items: center;">
                    <div style="font-size: 10px; color: var(--text-muted, #64748b); font-weight: 700; margin-bottom: 2px;">${code}</div>
                     <div style="font-size: ${window.innerWidth <= 768 ? '13px' : '14px'}; font-weight: 800; color: var(--text-color, #0f172a); line-height: 1.2; word-break: break-all; max-width: ${Math.max(nodeSlotWidth - 10, 46)}px;">${name}</div>
                    ${enName ? `<div style="font-size: 9px; color: var(--text-muted, #94a3b8); font-weight: 600; margin-top: 2px; transform: scale(0.9);">${enName}</div>` : ''}
                </div>
            </div>
          `;
      });
      
      if (!hasStations) {
          stationsHtml += `<div style="width: 100%; text-align: center; padding: 40px; color: var(--text-muted, #64748b);">该线路暂无站点</div>`;
      }
      
      stationsHtml += `</div></div>`;
      
      mapContainer.innerHTML = tabsHtml + stationsHtml;
  }
  
  window.switchTvmLine = (lineId) => {
      activeLineId = lineId;
      renderTvmUI();
  };

  window.handleStationClick = (code) => {
      code = String(code || '').trim();
      // Toggle if already selected
      if (selection[0] === code) {
          selection[0] = null;
      } else if (selection[1] === code) {
          selection[1] = null;
      } else {
          // Add new selection
          if (!selection[0]) {
              selection[0] = code;
          } else if (!selection[1]) {
              selection[1] = code;
          } else {
              // When both ends are already selected, start a new selection flow.
              selection[0] = code;
              selection[1] = null;
              currentRoute = [];
              currentRouteTransfers = [];
          }
      }
      
      // Ensure no gaps (if start removed, move end to start)
      if (!selection[0] && selection[1]) {
          selection[0] = selection[1];
          selection[1] = null;
      }
      
      updateSelectionUI();
  };
  
  function normalizeTrips() {
      const raw = Number(tripsEl?.value || 1);
      const trips = Number.isFinite(raw) ? Math.max(1, Math.floor(raw)) : 1;
      if (tripsEl) tripsEl.value = String(trips);
      return trips;
  }

  function getStationDisplayName(code) {
      return stationNameByCode[String(code || '').trim()] || String(code || '').trim();
  }

  function getStationNameKey(code) {
      const cn = getStationDisplayName(code).replace(/\s+/g, '');
      const en = String(stationEnByCode[String(code || '').trim()] || '').toLowerCase().replace(/\s+/g, '');
      return `${cn}|${en}`;
  }

  function buildTransferGroups(stationsData) {
      const parent = {};
      const codesByName = {};
      const find = (code) => {
          if (!parent[code]) parent[code] = code;
          if (parent[code] !== code) parent[code] = find(parent[code]);
          return parent[code];
      };
      const union = (a, b) => {
          if (!a || !b) return;
          const ra = find(a);
          const rb = find(b);
          if (ra !== rb) parent[rb] = ra;
      };

      for (const s of stationsData) {
          const code = String(s?.code || s?.编号 || '').trim();
          if (!code) continue;
          parent[code] = code;
          const cn = String(s?.name || s?.名称 || '').replace(/\s+/g, '');
          const en = String(s?.en_name || s?.英文名 || '').toLowerCase().replace(/\s+/g, '');
          const nameKey = `${cn}|${en}`;
          if (cn || en) {
              if (!codesByName[nameKey]) codesByName[nameKey] = [];
              codesByName[nameKey].push(code);
          }
      }

      for (const s of stationsData) {
          const code = String(s?.code || s?.编号 || '').trim();
          if (!code) continue;
          const list = Array.isArray(s?.transfer_to) ? s.transfer_to : [];
          for (const item of list) {
              const to = String((typeof item === 'string') ? item : (item?.code || item?.station || item?.id || item?.[0] || '')).trim();
              if (to) union(code, to);
          }
      }

      for (const codes of Object.values(codesByName)) {
          if (!Array.isArray(codes) || codes.length < 2) continue;
          for (let i = 1; i < codes.length; i++) {
              union(codes[0], codes[i]);
          }
      }

      const byRoot = {};
      for (const code of Object.keys(parent)) {
          const root = find(code);
          if (!byRoot[root]) byRoot[root] = [];
          byRoot[root].push(code);
      }

      const canonicalByCode = {};
      const codesByCanonical = {};
      for (const codes of Object.values(byRoot)) {
          codes.sort((a, b) => a.localeCompare(b));
          const canonical = codes[0];
          codesByCanonical[canonical] = codes;
          for (const code of codes) canonicalByCode[code] = canonical;
      }
      return { canonicalByCode, codesByCanonical };
  }

  function buildDisplayRouteCodes(route, from, to) {
      const middle = Array.isArray(route) ? route.filter(c => c && c !== from && c !== to) : [];
      const merged = [];
      for (const code of [from, ...middle, to].filter(Boolean)) {
          const prev = merged[merged.length - 1];
          const prevName = prev ? getStationDisplayName(prev).replace(/\s+/g, '') : '';
          const nextName = getStationDisplayName(code).replace(/\s+/g, '');
          if (prev && prevName && prevName === nextName) continue;
          merged.push(code);
      }
      return merged;
  }

  function updateSelectionUI(skipPreview = false) {
      if (!(selection[0] && selection[1])) {
          currentRoute = [];
          currentRouteTransfers = [];
      }

      // Update Inputs
      fromEl.value = selection[0] || '';
      toEl.value = selection[1] || '';
      
      // Update Displays with Chinese names
      const getName = (code) => {
          return stationNameByCode[String(code || '').trim()] || code;
      };

      $('#fromDisplay').textContent = selection[0] ? getName(selection[0]) : '请在上方地图选择';
      $('#toDisplay').textContent = selection[1] ? getName(selection[1]) : '请在上方地图选择';
      
      // Refresh TVM UI to show selected/route states
      renderTvmUI();
      
      // Auto preview if both selected
      if(!skipPreview && selection[0] && selection[1]) previewPrice();
  }

  // Load Map on Start
  renderSystemMap();

  window.addEventListener('resize', () => {
      if (!allLinesData || allLinesData.length === 0) return;
      renderTvmUI();
  });

  async function previewPrice(force = false){
    const seq = ++previewSeq;
    const type = document.querySelector('input[name="trainType"]:checked').value;
    const trips = normalizeTrips();
    
    const from = (fromEl.value||'').trim();
    const to = (toEl.value||'').trim();
    if(!from || !to){ priceBox.innerHTML = '<div class="empty-state jr-empty-state"><p>请选择起点与终点</p></div>'; return; }
    const previewKey = `${from}|${to}|${type}|${trips}`;
    if (!force && previewKey === lastPreviewKey) return;
    lastPreviewKey = previewKey;
    
    try{
      const fare = await api.fareQuery(from, to);
      if (seq !== previewSeq) return;
      if(fare && (fare.error || fare['错误'])){ priceBox.innerHTML = '<div class="list-item jr-result-row"><span class="k">提示</span><span class="v">未找到对应票价</span></div>'; return; }
      const resolvedFrom = String(fare?.from_code || '').trim();
      const resolvedTo = String(fare?.to_code || '').trim();
      if ((resolvedFrom && resolvedFrom !== from) || (resolvedTo && resolvedTo !== to)) {
        lastPreviewKey = '';
        priceBox.innerHTML = `
          <div class="empty-state jr-empty-state">
            <p>站点解析异常，当前后端返回的站码与页面选择不一致。</p>
            <p>已选：${getStationDisplayName(from)}(${from}) -> ${getStationDisplayName(to)}(${to})</p>
            <p>返回：${getStationDisplayName(resolvedFrom)}(${resolvedFrom || '-'}) -> ${getStationDisplayName(resolvedTo)}(${resolvedTo || '-'})</p>
            <p>请先部署最新后端并清理 CDN 缓存后再试。</p>
          </div>
        `;
        currentRoute = [];
        currentRouteTransfers = [];
        updateSelectionUI(true);
        return;
      }
      const discRaw = Number(fare?.discount ?? fare?.['折扣'] ?? 1);
      const disc = Number.isFinite(discRaw) && discRaw > 0 ? discRaw : 1;
      const base = (type==='Express')
        ? Number(fare?.express_fare ?? fare?.['特快票价'] ?? 0)
        : Number(fare?.regular_fare ?? fare?.['常规票价'] ?? 0);
      const discountedRaw = (type==='Express')
        ? (fare?.discounted_express_fare ?? fare?.['优惠后特快票价'])
        : (fare?.discounted_regular_fare ?? fare?.['优惠后常规票价']);
      const discountedSingle = Number(discountedRaw ?? Math.round(base * disc) ?? 0);
      const price = discountedSingle * trips;

      const routeKey = (type === 'Express') ? 'express_path' : 'regular_path';
      const transferKey = (type === 'Express') ? 'express_transfers' : 'regular_transfers';
      currentRoute = Array.isArray(fare?.[routeKey]) ? fare[routeKey] : [];
      currentRouteTransfers = Array.isArray(fare?.[transferKey]) ? fare[transferKey] : [];
      const displayRoute = buildDisplayRouteCodes(currentRoute, from, to);
      const routeText = displayRoute.length > 0 ? displayRoute.map(getStationDisplayName).join(' → ') : '';
      const transferStops = [];
      const seenTransferNames = new Set();
      for (const code of currentRouteTransfers) {
        if (code === from || code === to) continue;
        const nameKey = getStationDisplayName(code).replace(/\s+/g, '');
        if (!nameKey || seenTransferNames.has(nameKey)) continue;
        seenTransferNames.add(nameKey);
        transferStops.push(code);
      }
      const transferHtml = transferStops.length
        ? `<div class="jr-transfer-chips">${transferStops.map(c => `<span class="badge badge-secondary">${getStationDisplayName(c)}</span>`).join('')}</div>`
        : `<span class="text-muted">无</span>`;

      priceBox.innerHTML = `
        <div class="list-item jr-result-row"><span class="k">原始票价</span><span class="v">${base}</span></div>
        <div class="list-item jr-result-row"><span class="k">优惠后票价</span><span class="v">${discountedSingle}</span></div>
        <div class="list-item jr-result-row"><span class="k">折扣</span><span class="v">-${Math.round((1-disc)*100)}%</span></div>
        ${routeText ? `<div class="list-item jr-result-row jr-result-multiline"><span class="k">路径</span><span class="v jr-route-text">${routeText}</span></div>` : ``}
        <div class="list-item jr-result-row jr-result-multiline"><span class="k">换乘</span><span class="v jr-route-text">${transferHtml}</span></div>
        <div class="list-item jr-result-row jr-total-row">
            <span class="k">总价</span><span class="v jr-total-amount">${price}</span>
        </div>
      `;
      updateSelectionUI(true);
    }catch(e){
      lastPreviewKey = '';
      priceBox.innerHTML = '<div class="empty-state jr-empty-state"><p>票价预估失败，请稍后再试。</p></div>';
    }
  }

  // Create Order with auto-preview
  async function createOrder(){
    const type = document.querySelector('input[name="trainType"]:checked').value;
    const trips = normalizeTrips();
    const ride_date = new Date().toISOString().slice(0, 10);
    
    let payload = null;
    const from = (fromEl.value||'').trim();
    const to = (toEl.value||'').trim();
    if(!from || !to){ alert('请完整填写信息'); return; }
    
    // Auto-fetch price before creating
    await previewPrice(true);
    payload = { start: from, terminal: to, train_type: type, trips, ride_date };

    try{
      const res = await fetch('/api/public/orders', { method:'POST', headers:{ 'Content-Type':'application/json' }, body: JSON.stringify(payload) });
      const r = await res.json();
      if(r && r.ok){
        // Link to external subdomain or local page
        const buildTokenLink = (code) => {
            if (location.hostname.includes('fse-media.group')) {
                return `https://ticket.fse-media.group/token?code=${encodeURIComponent(code)}`;
            }
            return `/token.html?code=${encodeURIComponent(code)}`;
        };
        
        voucherBox.innerHTML = `
          <div class="voucher-container jr-voucher-panel">
            <div class="jr-voucher-meta">凭证码</div>
            <div class="voucher-code">${r.code}</div>
            <div class="voucher-hint">请在游戏内任意售票机选择线上订票并输入该凭证码兑票。</div>
            <div class="toolbar jr-voucher-actions">
                <a class="btn jr-detail-btn" href="${buildTokenLink(r.code)}" target="_self"><i class="fas fa-eye"></i> 详情</a>
            </div>
          </div>
        `;
      }else{
        alert('创建失败: ' + (r.error || '未知错误'));
      }
    }catch(e){ alert('创建失败'); }
  }

  const btnPreview = $('#previewPrice');
  if(btnPreview) btnPreview.onclick = previewPrice;
  
  const btnCreate = $('#createOrder');
  if(btnCreate) btnCreate.onclick = createOrder;
  // Listen for Type change to auto-update price
  document.querySelectorAll('input[name="trainType"]').forEach(el => {
      el.onchange = () => { if(fromEl.value && toEl.value) previewPrice(); };
  });
  if (tripsEl) {
      tripsEl.oninput = () => { if(fromEl.value && toEl.value) previewPrice(); };
      tripsEl.onchange = () => { normalizeTrips(); if(fromEl.value && toEl.value) previewPrice(); };
  }
})();