diff --git a/web/charts.js b/web/charts.js
index 9e15c52..cd96c11 100644
--- a/web/charts.js
+++ b/web/charts.js
@@ -46,6 +46,9 @@ let lwcModalCandles = [];
 let lwcModalInterval = "1d";
 let lwcModalPriceMeta = { tick_size: "0.01", price_precision: 2 };
 let lwcOnVisibleRangeChange = null;
+let lwcOnCrosshairMove = null;
+let lwcOnChartClick = null;
+let lwcPinnedCandleTime = null;
 
 function cacheKey(symbol, interval) {
   return `${symbol}:${interval}`;
@@ -109,6 +112,142 @@ function formatPrice(price, precision) {
   return Number(price).toFixed(precision);
 }
 
+function formatVolume(val) {
+  const v = Number(val);
+  if (!Number.isFinite(v)) return "—";
+  if (v >= 1e8) return `${(v / 1e8).toFixed(2)}亿`;
+  if (v >= 1e4) return `${(v / 1e4).toFixed(2)}万`;
+  return v.toFixed(2);
+}
+
+function calcAmplitude(candle) {
+  const open = Number(candle.open);
+  const high = Number(candle.high);
+  const low = Number(candle.low);
+  if (!open) return "—";
+  return `${(((high - low) / open) * 100).toFixed(2)}%`;
+}
+
+function lwcTimeEquals(a, b) {
+  if (a == null || b == null) return false;
+  if (typeof a === "number" && typeof b === "number") return a === b;
+  if (typeof a === "object" && typeof b === "object") {
+    return a.year === b.year && a.month === b.month && a.day === b.day;
+  }
+  return false;
+}
+
+function findCandleByLwcTime(time) {
+  if (time == null) return null;
+  for (const c of lwcModalCandles) {
+    if (lwcTimeEquals(toLwcTime(c.time, lwcModalInterval), time)) return c;
+  }
+  return null;
+}
+
+function formatCandleTimeLabel(ms, interval) {
+  const d = new Date(ms);
+  if (interval === "1d" || interval === "1w") {
+    return d.toLocaleDateString("zh-CN");
+  }
+  return d.toLocaleString("zh-CN", {
+    month: "2-digit",
+    day: "2-digit",
+    hour: "2-digit",
+    minute: "2-digit",
+    hour12: false,
+  });
+}
+
+function renderOhlcPanel(candle, modeLabel) {
+  const panel = document.getElementById("chart-ohlc-panel");
+  if (!panel) return;
+  if (!candle) {
+    panel.innerHTML = '<span class="chart-ohlc-empty">—</span>';
+    return;
+  }
+
+  const precision = lwcModalPriceMeta.price_precision ?? 2;
+  const up = Number(candle.close) >= Number(candle.open);
+  const closeCls = up ? "up" : "down";
+  const vol = formatVolume(candle.quote_volume || candle.volume);
+  const timeLabel = formatCandleTimeLabel(candle.time, lwcModalInterval);
+
+  panel.innerHTML = `
+    <div class="chart-ohlc-head">
+      <span class="chart-ohlc-mode">${modeLabel}</span>
+      <span class="chart-ohlc-time">${timeLabel}</span>
+    </div>
+    <div class="chart-ohlc-row">
+      <span>开 <b>${formatPrice(candle.open, precision)}</b></span>
+      <span>高 <b class="up">${formatPrice(candle.high, precision)}</b></span>
+      <span>低 <b class="down">${formatPrice(candle.low, precision)}</b></span>
+      <span>收 <b class="${closeCls}">${formatPrice(candle.close, precision)}</b></span>
+      <span>量 <b>${vol}</b></span>
+      <span>振幅 <b>${calcAmplitude(candle)}</b></span>
+    </div>`;
+}
+
+function showLatestOhlcPanel() {
+  const last = lwcModalCandles[lwcModalCandles.length - 1];
+  renderOhlcPanel(last, "最新");
+}
+
+function updateOhlcFromTime(time, modeLabel) {
+  const candle = findCandleByLwcTime(time);
+  if (candle) renderOhlcPanel(candle, modeLabel);
+}
+
+function onChartAutoscale() {
+  if (!lwcChart) return;
+  lwcPinnedCandleTime = null;
+  lwcChart.timeScale().fitContent();
+  lwcChart.priceScale("right").applyOptions({ autoScale: true });
+  requestAnimationFrame(() => {
+    updateHighLowForVisibleWindow();
+    showLatestOhlcPanel();
+  });
+}
+
+function unbindChartInteractions() {
+  if (lwcChart && lwcOnCrosshairMove) {
+    lwcChart.unsubscribeCrosshairMove(lwcOnCrosshairMove);
+  }
+  if (lwcChart && lwcOnChartClick) {
+    lwcChart.unsubscribeClick(lwcOnChartClick);
+  }
+  lwcOnCrosshairMove = null;
+  lwcOnChartClick = null;
+}
+
+function bindChartInteractions() {
+  if (!lwcChart) return;
+  unbindChartInteractions();
+
+  lwcOnCrosshairMove = (param) => {
+    if (lwcPinnedCandleTime != null) return;
+    if (param.time) {
+      updateOhlcFromTime(param.time, "当前");
+      return;
+    }
+    showLatestOhlcPanel();
+  };
+
+  lwcOnChartClick = (param) => {
+    if (!param.time) return;
+    if (lwcPinnedCandleTime != null && lwcTimeEquals(lwcPinnedCandleTime, param.time)) {
+      lwcPinnedCandleTime = null;
+      updateOhlcFromTime(param.time, "当前");
+      return;
+    }
+    lwcPinnedCandleTime = param.time;
+    updateOhlcFromTime(param.time, "选中");
+  };
+
+  lwcChart.subscribeCrosshairMove(lwcOnCrosshairMove);
+  lwcChart.subscribeClick(lwcOnChartClick);
+}
+
 function rememberPriceMeta(symbol, meta) {
   if (!meta?.tick_size) return null;
   const priceMeta = {
@@ -410,8 +549,10 @@ async function loadMiniChart(box) {
 
 function destroyLwcChart() {
   unbindVisibleRangeHighLow();
+  unbindChartInteractions();
   clearHighLowAnnotations();
   lwcModalCandles = [];
+  lwcPinnedCandleTime = null;
   if (lwcResizeObserver) {
     lwcResizeObserver.disconnect();
     lwcResizeObserver = null;
@@ -561,6 +702,7 @@ function ensureLwcChart(container) {
   lwcResizeObserver.observe(container);
 
   bindVisibleRangeHighLow();
+  bindChartInteractions();
 
   return lwcChart;
 }
@@ -578,12 +720,16 @@ function renderLwcChart(candles, interval, priceMeta) {
   lwcModalCandles = candles;
   lwcModalInterval = interval;
   lwcModalPriceMeta = meta;
+  lwcPinnedCandleTime = null;
 
   const { ohlc, vol } = candlesToLwc(candles, interval);
   lwcCandleSeries.setData(ohlc);
   lwcVolumeSeries.setData(vol);
   lwcChart.timeScale().fitContent();
-  requestAnimationFrame(() => updateHighLowForVisibleWindow());
+  requestAnimationFrame(() => {
+    updateHighLowForVisibleWindow();
+    showLatestOhlcPanel();
+  });
 }
 
 function updateIntervalTabs() {
@@ -599,7 +745,7 @@ function updateModalMeta(candles, source, interval) {
     title.textContent = `${chartModalSymbol} · ${interval.toUpperCase()} K线`;
   }
   if (hint) {
-    hint.textContent = `${candles.length} 根 · ${sourceLabel(source)} · 最高/最低随可见窗口 · 滚轮缩放 · Esc 关闭`;
+    hint.textContent = `${candles.length} 根 · ${sourceLabel(source)} · 十字线看当前 · 点击选中 · Esc 关闭`;
   }
 }
 
@@ -674,6 +820,8 @@ function setupChartModal() {
         </div>
         <p class="chart-modal-hint" id="chart-modal-hint"></p>
         <div class="chart-modal-canvas-wrap">
+          <div id="chart-ohlc-panel" class="chart-ohlc-panel"></div>
+          <button type="button" id="chart-autoscale-btn" class="chart-autoscale-btn">自动</button>
           <div id="chart-modal-container" class="chart-lwc-container"></div>
         </div>
       </div>`;
@@ -694,6 +842,7 @@ function setupChartModal() {
     });
 
     modal.querySelector(".chart-modal-close").onclick = closeChartModal;
+    document.getElementById("chart-autoscale-btn")?.addEventListener("click", onChartAutoscale);
     modal.addEventListener("click", (e) => {
       if (e.target === modal) closeChartModal();
     });
diff --git a/web/style.css b/web/style.css
index 2bd4986..3c9cbcd 100644
--- a/web/style.css
+++ b/web/style.css
@@ -501,12 +501,85 @@ button:hover {
 }
 
 .chart-modal-canvas-wrap {
+  position: relative;
   overflow: hidden;
   border-radius: 8px;
   border: 1px solid var(--border);
   background: #0d1118;
 }
 
+.chart-ohlc-panel {
+  position: absolute;
+  top: 10px;
+  left: 12px;
+  z-index: 5;
+  pointer-events: none;
+  padding: 0.45rem 0.65rem;
+  border-radius: 6px;
+  background: rgba(13, 17, 24, 0.82);
+  border: 1px solid var(--border);
+  font-size: 0.82rem;
+  color: var(--text);
+  line-height: 1.45;
+  max-width: calc(100% - 120px);
+}
+
+.chart-ohlc-head {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin-bottom: 0.2rem;
+  color: var(--muted);
+  font-size: 0.75rem;
+}
+
+.chart-ohlc-mode {
+  color: var(--accent);
+  font-weight: 600;
+}
+
+.chart-ohlc-row {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.65rem 1rem;
+}
+
+.chart-ohlc-row b {
+  font-weight: 600;
+  color: var(--text);
+}
+
+.chart-ohlc-row b.up {
+  color: #0ecb81;
+}
+
+.chart-ohlc-row b.down {
+  color: #f6465d;
+}
+
+.chart-ohlc-empty {
+  color: var(--muted);
+}
+
+.chart-autoscale-btn {
+  position: absolute;
+  right: 58px;
+  bottom: 28px;
+  z-index: 5;
+  padding: 0.2rem 0.55rem;
+  font-size: 0.75rem;
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  background: rgba(13, 17, 24, 0.88);
+  color: var(--muted);
+  cursor: pointer;
+}
+
+.chart-autoscale-btn:hover {
+  color: var(--text);
+  border-color: var(--accent);
+}
+
 .chart-modal-close {
   float: right;
   background: transparent;