diff --git a/backend/app/binance.py b/backend/app/binance.py
index 2e474e5..0467348 100644
--- a/backend/app/binance.py
+++ b/backend/app/binance.py
@@ -236,11 +236,7 @@ class BinanceFuturesClient:
             )
         return rows
 
-    async def get_daily_klines(self, symbol: str, limit: int = 300) -> list[dict]:
-        raw = await self._get(
-            "/fapi/v1/klines",
-            {"symbol": symbol.upper(), "interval": "1d", "limit": min(limit, 1500)},
-        )
+    def _parse_kline_rows(self, raw: list | None) -> list[dict]:
         candles = []
         for k in raw or []:
             candles.append(
@@ -256,5 +252,21 @@ class BinanceFuturesClient:
             )
         return candles
 
+    async def get_klines_limit(
+        self, symbol: str, interval: str, limit: int = 500
+    ) -> list[dict]:
+        raw = await self._get(
+            "/fapi/v1/klines",
+            {
+                "symbol": symbol.upper(),
+                "interval": interval,
+                "limit": min(limit, 1500),
+            },
+        )
+        return self._parse_kline_rows(raw)
+
+    async def get_daily_klines(self, symbol: str, limit: int = 300) -> list[dict]:
+        return await self.get_klines_limit(symbol, "1d", limit)
+
 
 binance_client = BinanceFuturesClient()
diff --git a/backend/app/chart_intervals.py b/backend/app/chart_intervals.py
new file mode 100644
index 0000000..a67ab5f
--- /dev/null
+++ b/backend/app/chart_intervals.py
@@ -0,0 +1,44 @@
+"""K 线周期常量与每周期 bar 数 / 缓存 TTL。"""
+
+CHART_INTERVALS: tuple[str, ...] = ("5m", "15m", "30m", "1h", "4h", "1d", "1w")
+
+LONG_INTERVALS: frozenset[str] = frozenset({"1d", "1w"})
+
+# 1d 及以上 500 根；以下 1000 根
+INTERVAL_LIMITS: dict[str, int] = {
+    "5m": 1000,
+    "15m": 1000,
+    "30m": 1000,
+    "1h": 1000,
+    "4h": 1000,
+    "1d": 500,
+    "1w": 500,
+}
+
+# 预取 / 本地 freshness（分钟）
+INTERVAL_CACHE_MINUTES: dict[str, int] = {
+    "5m": 5,
+    "15m": 15,
+    "30m": 15,
+    "1h": 30,
+    "4h": 30,
+    "1d": 60,
+    "1w": 60,
+}
+
+
+def validate_interval(interval: str) -> str:
+    iv = interval.lower().strip()
+    if iv not in CHART_INTERVALS:
+        raise ValueError(f"unsupported interval: {interval}")
+    return iv
+
+
+def limit_for_interval(interval: str) -> int:
+    iv = validate_interval(interval)
+    return INTERVAL_LIMITS[iv]
+
+
+def cache_minutes_for_interval(interval: str) -> int:
+    iv = validate_interval(interval)
+    return INTERVAL_CACHE_MINUTES[iv]
diff --git a/backend/app/db.py b/backend/app/db.py
index 816ab44..8d28991 100644
--- a/backend/app/db.py
+++ b/backend/app/db.py
@@ -47,6 +47,23 @@ def init_db() -> None:
                 message TEXT
             );
 
+            CREATE TABLE IF NOT EXISTS klines (
+                symbol TEXT NOT NULL,
+                interval TEXT NOT NULL,
+                open_time INTEGER NOT NULL,
+                open REAL NOT NULL,
+                high REAL NOT NULL,
+                low REAL NOT NULL,
+                close REAL NOT NULL,
+                volume REAL NOT NULL,
+                quote_volume REAL NOT NULL DEFAULT 0,
+                updated_at TEXT NOT NULL,
+                PRIMARY KEY (symbol, interval, open_time)
+            );
+
+            CREATE INDEX IF NOT EXISTS idx_klines_symbol_interval
+                ON klines(symbol, interval, open_time);
+
             CREATE TABLE IF NOT EXISTS daily_klines (
                 symbol TEXT NOT NULL,
                 open_time INTEGER NOT NULL,
@@ -64,9 +81,11 @@ def init_db() -> None:
                 ON daily_klines(symbol, open_time);
 
             CREATE TABLE IF NOT EXISTS kline_meta (
-                symbol TEXT PRIMARY KEY,
+                symbol TEXT NOT NULL,
+                interval TEXT NOT NULL DEFAULT '1d',
                 last_fetch_at TEXT NOT NULL,
-                bar_count INTEGER NOT NULL
+                bar_count INTEGER NOT NULL,
+                PRIMARY KEY (symbol, interval)
             );
 
             CREATE TABLE IF NOT EXISTS funding_history (
@@ -99,6 +118,57 @@ def init_db() -> None:
 
             """
         )
+        _migrate_klines_if_needed(conn)
+
+
+def _migrate_klines_if_needed(conn: sqlite3.Connection) -> None:
+    """从旧版 daily_klines / 单 symbol kline_meta 迁移到多周期表。"""
+    cols = conn.execute("PRAGMA table_info(kline_meta)").fetchall()
+    col_names = {c[1] for c in cols}
+    if "interval" not in col_names and cols:
+        rows = conn.execute(
+            "SELECT symbol, last_fetch_at, bar_count FROM kline_meta"
+        ).fetchall()
+        conn.execute("DROP TABLE kline_meta")
+        conn.execute(
+            """
+            CREATE TABLE kline_meta (
+                symbol TEXT NOT NULL,
+                interval TEXT NOT NULL DEFAULT '1d',
+                last_fetch_at TEXT NOT NULL,
+                bar_count INTEGER NOT NULL,
+                PRIMARY KEY (symbol, interval)
+            )
+            """
+        )
+        for r in rows:
+            conn.execute(
+                """
+                INSERT INTO kline_meta (symbol, interval, last_fetch_at, bar_count)
+                VALUES (?, '1d', ?, ?)
+                """,
+                (r[0], r[1], r[2]),
+            )
+
+    has_klines = conn.execute(
+        "SELECT 1 FROM klines LIMIT 1"
+    ).fetchone()
+    if has_klines:
+        return
+
+    daily_count = conn.execute("SELECT COUNT(*) FROM daily_klines").fetchone()[0]
+    if not daily_count:
+        return
+
+    conn.execute(
+        """
+        INSERT OR IGNORE INTO klines (
+            symbol, interval, open_time, open, high, low, close, volume, quote_volume, updated_at
+        )
+        SELECT symbol, '1d', open_time, open, high, low, close, volume, quote_volume, updated_at
+        FROM daily_klines
+        """
+    )
 
 
 def save_snapshot(
@@ -159,7 +229,82 @@ def log_push(period_start: str, period_end: str, success: bool, message: str = "
         )
 
 
+def save_klines(symbol: str, interval: str, candles: list[dict[str, Any]]) -> None:
+    sym = symbol.upper()
+    iv = interval.lower()
+    now = datetime.now().isoformat()
+    with get_conn() as conn:
+        for c in candles:
+            conn.execute(
+                """
+                INSERT INTO klines (
+                    symbol, interval, open_time, open, high, low, close, volume, quote_volume, updated_at
+                ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+                ON CONFLICT(symbol, interval, open_time) DO UPDATE SET
+                    open = excluded.open,
+                    high = excluded.high,
+                    low = excluded.low,
+                    close = excluded.close,
+                    volume = excluded.volume,
+                    quote_volume = excluded.quote_volume,
+                    updated_at = excluded.updated_at
+                """,
+                (
+                    sym,
+                    iv,
+                    int(c["time"]),
+                    float(c["open"]),
+                    float(c["high"]),
+                    float(c["low"]),
+                    float(c["close"]),
+                    float(c.get("volume", 0)),
+                    float(c.get("quote_volume", 0)),
+                    now,
+                ),
+            )
+        conn.execute(
+            """
+            INSERT INTO kline_meta (symbol, interval, last_fetch_at, bar_count)
+            VALUES (?, ?, ?, ?)
+            ON CONFLICT(symbol, interval) DO UPDATE SET
+                last_fetch_at = excluded.last_fetch_at,
+                bar_count = excluded.bar_count
+            """,
+            (sym, iv, now, len(candles)),
+        )
+
+
+def get_klines_from_db(symbol: str, interval: str, limit: int) -> list[dict[str, Any]]:
+    sym = symbol.upper()
+    iv = interval.lower()
+    with get_conn() as conn:
+        rows = conn.execute(
+            """
+            SELECT open_time, open, high, low, close, volume, quote_volume
+            FROM klines
+            WHERE symbol = ? AND interval = ?
+            ORDER BY open_time DESC
+            LIMIT ?
+            """,
+            (sym, iv, limit),
+        ).fetchall()
+    rows = list(reversed(rows))
+    return [
+        {
+            "time": int(r["open_time"]),
+            "open": float(r["open"]),
+            "high": float(r["high"]),
+            "low": float(r["low"]),
+            "close": float(r["close"]),
+            "volume": float(r["volume"]),
+            "quote_volume": float(r["quote_volume"]),
+        }
+        for r in rows
+    ]
+
+
 def save_daily_klines(symbol: str, candles: list[dict[str, Any]]) -> None:
+    save_klines(symbol, "1d", candles)
     sym = symbol.upper()
     now = datetime.now().isoformat()
     with get_conn() as conn:
@@ -190,19 +335,12 @@ def save_daily_klines(symbol: str, candles: list[dict[str, Any]]) -> None:
                     now,
                 ),
             )
-        conn.execute(
-            """
-            INSERT INTO kline_meta (symbol, last_fetch_at, bar_count)
-            VALUES (?, ?, ?)
-            ON CONFLICT(symbol) DO UPDATE SET
-                last_fetch_at = excluded.last_fetch_at,
-                bar_count = excluded.bar_count
-            """,
-            (sym, now, len(candles)),
-        )
 
 
 def get_daily_klines_from_db(symbol: str, limit: int) -> list[dict[str, Any]]:
+    stored = get_klines_from_db(symbol, "1d", limit)
+    if stored:
+        return stored
     sym = symbol.upper()
     with get_conn() as conn:
         rows = conn.execute(
@@ -230,12 +368,33 @@ def get_daily_klines_from_db(symbol: str, limit: int) -> list[dict[str, Any]]:
     ]
 
 
-def get_kline_meta(symbol: str) -> dict[str, Any] | None:
+def get_kline_meta(symbol: str, interval: str = "1d") -> dict[str, Any] | None:
     sym = symbol.upper()
+    iv = interval.lower()
     with get_conn() as conn:
+        row = conn.execute(
+            "SELECT last_fetch_at, bar_count FROM kline_meta WHERE symbol = ? AND interval = ?",
+            (sym, iv),
+        ).fetchone()
+    if not row:
+        if iv == "1d":
+            return _legacy_kline_meta(sym)
+        return None
+    return {
+        "last_fetch_at": row["last_fetch_at"],
+        "bar_count": row["bar_count"],
+    }
+
+
+def _legacy_kline_meta(symbol: str) -> dict[str, Any] | None:
+    """兼容旧库仅有 symbol 维度的 meta（迁移前）。"""
+    with get_conn() as conn:
+        cols = {c[1] for c in conn.execute("PRAGMA table_info(kline_meta)").fetchall()}
+        if "interval" in cols:
+            return None
         row = conn.execute(
             "SELECT last_fetch_at, bar_count FROM kline_meta WHERE symbol = ?",
-            (sym,),
+            (symbol,),
         ).fetchone()
     if not row:
         return None
diff --git a/backend/app/kline_store.py b/backend/app/kline_store.py
index aa57802..3a3018a 100644
--- a/backend/app/kline_store.py
+++ b/backend/app/kline_store.py
@@ -1,18 +1,23 @@
-"""日 K 线：优先 SQLite 本地库，不足或过期再请求币安。"""
+"""多周期 K 线：优先 SQLite，不足或过期再请求币安。"""
 
 import logging
 from datetime import datetime
 
 from .binance import binance_client
-from .config import settings
-from .db import get_daily_klines_from_db, get_kline_meta, save_daily_klines
+from .chart_intervals import (
+    CHART_INTERVALS,
+    cache_minutes_for_interval,
+    limit_for_interval,
+    validate_interval,
+)
+from .db import get_kline_meta, get_klines_from_db, save_klines
 from .exceptions import BinanceRateLimitedError
 
 logger = logging.getLogger(__name__)
 
 
-def _is_db_fresh(symbol: str, min_bars: int) -> bool:
-    meta = get_kline_meta(symbol)
+def _is_db_fresh(symbol: str, interval: str, min_bars: int) -> bool:
+    meta = get_kline_meta(symbol, interval)
     if not meta or meta.get("bar_count", 0) < min_bars:
         return False
     try:
@@ -20,21 +25,29 @@ def _is_db_fresh(symbol: str, min_bars: int) -> bool:
     except ValueError:
         return False
     age = (datetime.now() - last_fetch).total_seconds()
-    return age < settings.chart_cache_minutes * 60
+    return age < cache_minutes_for_interval(interval) * 60
 
 
-async def sync_daily_klines(symbol: str, limit: int | None = None) -> list[dict]:
-    """从币安拉取并写入本地库。"""
+async def sync_klines(
+    symbol: str, interval: str, limit: int | None = None
+) -> list[dict]:
+    """从币安拉取指定周期并写入本地库。"""
     sym = symbol.upper()
-    n = min(limit or settings.chart_kline_limit, 1500)
-    candles = await binance_client.get_daily_klines(sym, n)
-    save_daily_klines(sym, candles)
-    logger.info("Saved %d daily klines for %s to DB", len(candles), sym)
+    iv = validate_interval(interval)
+    n = min(limit or limit_for_interval(iv), 1500)
+    candles = await binance_client.get_klines_limit(sym, iv, n)
+    save_klines(sym, iv, candles)
+    logger.info("Saved %d %s klines for %s to DB", len(candles), iv, sym)
     return candles
 
 
-async def get_daily_candles(
+async def sync_daily_klines(symbol: str, limit: int | None = None) -> list[dict]:
+    return await sync_klines(symbol, "1d", limit)
+
+
+async def get_candles(
     symbol: str,
+    interval: str = "1d",
     limit: int | None = None,
     force_refresh: bool = False,
 ) -> tuple[list[dict], str]:
@@ -43,23 +56,24 @@ async def get_daily_candles(
     source: db | db_stale | binance
     """
     sym = symbol.upper().strip()
-    n = min(limit or settings.chart_kline_limit, 1500)
+    iv = validate_interval(interval)
+    n = min(limit or limit_for_interval(iv), 1500)
     min_bars = min(n, 50)
 
-    if not force_refresh and _is_db_fresh(sym, min_bars):
-        candles = get_daily_klines_from_db(sym, n)
+    if not force_refresh and _is_db_fresh(sym, iv, min_bars):
+        candles = get_klines_from_db(sym, iv, n)
         if len(candles) >= min_bars:
             return candles, "db"
 
-    stored = get_daily_klines_from_db(sym, n)
+    stored = get_klines_from_db(sym, iv, n)
     if binance_client.is_rate_limited():
         if stored:
-            logger.warning("Rate limited, serve stale DB klines for %s", sym)
+            logger.warning("Rate limited, serve stale DB klines for %s %s", sym, iv)
             return stored, "db_stale"
         raise BinanceRateLimitedError(binance_client.rate_limit_remaining_sec(), sym)
 
     try:
-        candles = await sync_daily_klines(sym, n)
+        candles = await sync_klines(sym, iv, n)
         return candles, "binance"
     except BinanceRateLimitedError:
         if stored:
@@ -71,23 +85,33 @@ async def get_daily_candles(
         raise
 
 
+async def get_daily_candles(
+    symbol: str,
+    limit: int | None = None,
+    force_refresh: bool = False,
+) -> tuple[list[dict], str]:
+    return await get_candles(symbol, "1d", limit, force_refresh)
+
+
 async def prefetch_symbols(symbols: list[str]) -> None:
-    """后台预拉 Top 币种日 K 入库（串行，避免 418）。"""
+    """后台预拉 Top 币种全周期 K 线入库（串行，避免 418）。"""
     seen: set[str] = set()
     for raw in symbols:
         sym = raw.upper().strip()
         if not sym or sym in seen or not sym.endswith("USDT"):
             continue
         seen.add(sym)
-        if _is_db_fresh(sym, min(50, settings.chart_kline_limit)):
-            continue
-        if binance_client.is_rate_limited():
-            logger.warning("Prefetch stopped — rate limited")
-            break
-        try:
-            await sync_daily_klines(sym)
-        except BinanceRateLimitedError:
-            logger.warning("Prefetch rate limited at %s", sym)
-            break
-        except Exception as e:
-            logger.warning("Prefetch %s failed: %s", sym, e)
+        for interval in CHART_INTERVALS:
+            n = limit_for_interval(interval)
+            if _is_db_fresh(sym, interval, min(50, n)):
+                continue
+            if binance_client.is_rate_limited():
+                logger.warning("Prefetch stopped — rate limited")
+                return
+            try:
+                await sync_klines(sym, interval, n)
+            except BinanceRateLimitedError:
+                logger.warning("Prefetch rate limited at %s %s", sym, interval)
+                return
+            except Exception as e:
+                logger.warning("Prefetch %s %s failed: %s", sym, interval, e)
diff --git a/backend/app/main.py b/backend/app/main.py
index 4900533..82dae46 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -8,7 +8,8 @@ from fastapi.staticfiles import StaticFiles
 
 from .config import ROOT_DIR, settings
 from .funding_store import get_funding_bundle
-from .kline_store import get_daily_candles, sync_daily_klines
+from .kline_store import get_candles, get_daily_candles, sync_daily_klines, sync_klines
+from .chart_intervals import CHART_INTERVALS, limit_for_interval, validate_interval
 from .db import get_latest_snapshot, init_db, log_push, save_snapshot
 from .exceptions import BinanceRateLimitedError
 from .period_api import get_period_top30
@@ -144,9 +145,44 @@ async def api_refresh_daybefore():
     return get_latest_snapshot("daybefore") or {"message": "done"}
 
 
+@app.get("/api/chart/{symbol}")
+async def api_chart(
+    symbol: str,
+    interval: str = "1d",
+    limit: int | None = None,
+    refresh: bool = False,
+):
+    """合约 K 线：优先读本地 SQLite，过期再拉币安入库。"""
+    sym = symbol.upper().strip()
+    if not sym.endswith("USDT"):
+        raise HTTPException(400, "invalid symbol")
+    try:
+        iv = validate_interval(interval)
+    except ValueError as e:
+        raise HTTPException(400, str(e)) from e
+    default_limit = limit_for_interval(iv)
+    try:
+        candles, source = await get_candles(
+            sym, iv, limit or default_limit, force_refresh=refresh
+        )
+        return {
+            "symbol": sym,
+            "interval": iv,
+            "limit": len(candles),
+            "candles": candles,
+            "source": source,
+            "intervals": list(CHART_INTERVALS),
+        }
+    except BinanceRateLimitedError as e:
+        raise HTTPException(503, f"币安限流，请 {e.retry_after_sec} 秒后再试") from e
+    except Exception as e:
+        logger.error("chart %s %s failed: %s", sym, iv, e)
+        raise HTTPException(502, "K线获取失败") from e
+
+
 @app.get("/api/chart/{symbol}/daily")
 async def api_chart_daily(symbol: str, limit: int | None = None, refresh: bool = False):
-    """合约日 K 线：优先读本地 SQLite，过期再拉币安入库。"""
+    """合约日 K 线（兼容旧路径）。"""
     sym = symbol.upper().strip()
     if not sym.endswith("USDT"):
         raise HTTPException(400, "invalid symbol")
@@ -158,6 +194,7 @@ async def api_chart_daily(symbol: str, limit: int | None = None, refresh: bool =
             "limit": len(candles),
             "candles": candles,
             "source": source,
+            "intervals": list(CHART_INTERVALS),
         }
     except BinanceRateLimitedError as e:
         raise HTTPException(503, f"币安限流，请 {e.retry_after_sec} 秒后再试") from e
@@ -180,6 +217,23 @@ async def api_funding_history(symbol: str, limit: int | None = None, refresh: bo
         raise HTTPException(502, "资金费率获取失败") from e
 
 
+@app.post("/api/chart/{symbol}/refresh")
+async def api_chart_refresh(
+    symbol: str, interval: str = "1d", limit: int | None = None
+):
+    """强制从币安同步 K 线到本地库。"""
+    sym = symbol.upper().strip()
+    try:
+        iv = validate_interval(interval)
+    except ValueError as e:
+        raise HTTPException(400, str(e)) from e
+    try:
+        candles = await sync_klines(sym, iv, limit)
+        return {"symbol": sym, "interval": iv, "saved": len(candles), "source": "binance"}
+    except BinanceRateLimitedError as e:
+        raise HTTPException(503, f"币安限流，请 {e.retry_after_sec} 秒后再试") from e
+
+
 @app.post("/api/chart/{symbol}/daily/refresh")
 async def api_chart_daily_refresh(symbol: str, limit: int | None = None):
     """强制从币安同步日 K 到本地库。"""
diff --git a/web/charts.js b/web/charts.js
index d30d917..da83ae7 100644
--- a/web/charts.js
+++ b/web/charts.js
@@ -1,4 +1,15 @@
-/** 日 K + 成交量（Canvas 高清）· 浏览器 localStorage 缓存 · 点击全屏 */
+/** 多周期 K 线 · SQLite 后端 + localStorage · 弹窗全屏 Lightweight Charts */
+
+const CHART_INTERVALS = ["5m", "15m", "30m", "1h", "4h", "1d", "1w"];
+const INTERVAL_LIMITS = {
+  "5m": 1000,
+  "15m": 1000,
+  "30m": 1000,
+  "1h": 1000,
+  "4h": 1000,
+  "1d": 500,
+  "1w": 500,
+};
 
 const chartDataCache = new Map();
 const chartQueue = [];
@@ -19,21 +30,37 @@ const COLORS = {
 };
 
 const MINI_SIZE = { w: 380, h: 100 };
+const DEFAULT_MINI_INTERVAL = "1d";
+
+let chartModalSymbol = "";
+let chartModalInterval = "1d";
+let lwcChart = null;
+let lwcCandleSeries = null;
+let lwcVolumeSeries = null;
+let lwcResizeObserver = null;
+
+function cacheKey(symbol, interval) {
+  return `${symbol}:${interval}`;
+}
+
+function limitForInterval(interval) {
+  return INTERVAL_LIMITS[interval] || 500;
+}
 
 function modalSize() {
   const fs = document.fullscreenElement;
   if (fs) {
     return {
       w: Math.max(800, window.innerWidth - 48),
-      h: Math.max(480, window.innerHeight - 100),
+      h: Math.max(480, window.innerHeight - 160),
     };
   }
-  return { w: 1280, h: 720 };
+  return { w: 1280, h: 680 };
 }
 
-function loadKlineFromLS(symbol) {
+function loadKlineFromLS(symbol, interval) {
   try {
-    const raw = localStorage.getItem(LS_KLINE_PREFIX + symbol);
+    const raw = localStorage.getItem(LS_KLINE_PREFIX + symbol + "_" + interval);
     if (!raw) return null;
     const obj = JSON.parse(raw);
     if (!obj?.candles?.length || Date.now() - (obj.ts || 0) > KLINE_TTL_MS) return null;
@@ -43,17 +70,59 @@ function loadKlineFromLS(symbol) {
   }
 }
 
-function saveKlineToLS(symbol, candles, source) {
+function saveKlineToLS(symbol, interval, candles, source) {
   try {
     localStorage.setItem(
-      LS_KLINE_PREFIX + symbol,
-      JSON.stringify({ ts: Date.now(), candles, source })
+      LS_KLINE_PREFIX + symbol + "_" + interval,
+      JSON.stringify({ ts: Date.now(), candles, source, interval })
     );
   } catch {
     /* quota */
   }
 }
 
+function sourceLabel(source) {
+  if (source === "browser") return "浏览器";
+  if (source === "db") return "本地";
+  if (source === "db_stale") return "本地(旧)";
+  if (source === "memory") return "缓存";
+  return "同步";
+}
+
+function toLwcTime(ms, interval) {
+  if (interval === "1d" || interval === "1w") {
+    const d = new Date(ms);
+    return {
+      year: d.getUTCFullYear(),
+      month: d.getUTCMonth() + 1,
+      day: d.getUTCDate(),
+    };
+  }
+  return Math.floor(ms / 1000);
+}
+
+function candlesToLwc(candles, interval) {
+  const ohlc = [];
+  const vol = [];
+  for (const c of candles) {
+    const t = toLwcTime(c.time, interval);
+    const up = c.close >= c.open;
+    ohlc.push({
+      time: t,
+      open: c.open,
+      high: c.high,
+      low: c.low,
+      close: c.close,
+    });
+    vol.push({
+      time: t,
+      value: Number(c.quote_volume || c.volume || 0),
+      color: up ? COLORS.volUp : COLORS.volDown,
+    });
+  }
+  return { ohlc, vol };
+}
+
 function enqueueCharts(root) {
   root.querySelectorAll(".mini-chart[data-symbol]").forEach((box) => {
     const symbol = box.dataset.symbol;
@@ -134,28 +203,6 @@ function drawCandlestickChart(canvas, candles, options = {}) {
   ctx.fillStyle = COLORS.bg;
   ctx.fillRect(0, 0, w, h);
 
-  if (large) {
-    ctx.strokeStyle = COLORS.grid;
-    ctx.lineWidth = 1;
-    for (let i = 0; i <= 4; i++) {
-      const y = pad.t + (priceH * i) / 4;
-      ctx.beginPath();
-      ctx.moveTo(pad.l, y);
-      ctx.lineTo(w - pad.r, y);
-      ctx.stroke();
-      const price = pMax - (pRange * i) / 4;
-      ctx.fillStyle = COLORS.text;
-      ctx.font = "11px Segoe UI, system-ui, sans-serif";
-      ctx.textAlign = "right";
-      ctx.fillText(price.toPrecision(6), pad.l - 8, y + 4);
-    }
-    ctx.fillStyle = COLORS.text;
-    ctx.font = "12px Segoe UI, system-ui, sans-serif";
-    ctx.textAlign = "left";
-    ctx.fillText("价格", pad.l, pad.t - 4);
-    ctx.fillText("成交量", pad.l, volTop - 4);
-  }
-
   ctx.strokeStyle = COLORS.grid;
   ctx.lineWidth = 1;
   ctx.beginPath();
@@ -198,10 +245,9 @@ function drawCandlestickChart(canvas, candles, options = {}) {
   }
 }
 
-function drawEmptyChart(canvas, large = false) {
+function drawEmptyChart(canvas) {
   if (!canvas) return;
-  const size = large ? modalSize() : MINI_SIZE;
-  const { ctx, w, h } = setupCanvas(canvas, size.w, size.h);
+  const { ctx, w, h } = setupCanvas(canvas, MINI_SIZE.w, MINI_SIZE.h);
   ctx.fillStyle = "#1a2332";
   ctx.fillRect(0, 0, w, h);
   ctx.fillStyle = COLORS.text;
@@ -209,30 +255,33 @@ function drawEmptyChart(canvas, large = false) {
   ctx.fillText("暂无数据", w / 2 - 28, h / 2);
 }
 
-async function fetchKlines(symbol) {
-  let candles = chartDataCache.get(symbol);
-  let source = "memory";
-  if (candles) return { candles, source };
+async function fetchKlines(symbol, interval = DEFAULT_MINI_INTERVAL) {
+  const key = cacheKey(symbol, interval);
+  let cached = chartDataCache.get(key);
+  if (cached) return cached;
 
-  const ls = loadKlineFromLS(symbol);
+  const ls = loadKlineFromLS(symbol, interval);
   if (ls) {
-    candles = ls.candles;
-    source = "browser";
-    chartDataCache.set(symbol, candles);
-    return { candles, source: ls.source || source };
+    const result = { candles: ls.candles, source: ls.source || "browser", interval };
+    chartDataCache.set(key, result);
+    return result;
   }
 
-  const res = await fetch(`/api/chart/${symbol}/daily?limit=300`);
+  const limit = limitForInterval(interval);
+  const res = await fetch(`/api/chart/${symbol}?interval=${interval}&limit=${limit}`);
   if (!res.ok) {
     const err = await res.json().catch(() => ({}));
     throw new Error(err.detail || res.statusText);
   }
   const data = await res.json();
-  candles = data.candles || [];
-  source = data.source || "db";
-  chartDataCache.set(symbol, candles);
-  saveKlineToLS(symbol, candles, source);
-  return { candles, source };
+  const result = {
+    candles: data.candles || [],
+    source: data.source || "db",
+    interval,
+  };
+  chartDataCache.set(key, result);
+  saveKlineToLS(symbol, interval, result.candles, result.source);
+  return result;
 }
 
 async function loadMiniChart(box) {
@@ -244,53 +293,178 @@ async function loadMiniChart(box) {
   if (status) status.textContent = "加载…";
 
   try {
-    const { candles, source } = await fetchKlines(symbol);
+    const { candles, source } = await fetchKlines(symbol, DEFAULT_MINI_INTERVAL);
     if (!candles.length) throw new Error("无K线数据");
     drawCandlestickChart(canvas, candles, { large: false });
     box.dataset.loaded = "1";
-    const srcLabel =
-      source === "browser"
-        ? "浏览器"
-        : source === "db"
-          ? "本地"
-          : source === "db_stale"
-            ? "本地(旧)"
-            : source === "cache"
-              ? "缓存"
-              : "同步";
-    if (status) status.textContent = `${candles.length}日·${srcLabel}`;
-    box.title = `${symbol} 日K+量 ${candles.length}根 (${srcLabel})，点击全屏`;
+    if (status) status.textContent = `${candles.length}日·${sourceLabel(source)}`;
+    box.title = `${symbol} 日K ${candles.length}根 (${sourceLabel(source)})，点击全屏`;
   } catch (e) {
     if (status) status.textContent = "—";
     box.title = `${symbol}: ${e.message}`;
-    drawEmptyChart(canvas, false);
+    drawEmptyChart(canvas);
   } finally {
     box.dataset.loading = "0";
   }
 }
 
-let chartModalSymbol = "";
+function destroyLwcChart() {
+  if (lwcResizeObserver) {
+    lwcResizeObserver.disconnect();
+    lwcResizeObserver = null;
+  }
+  if (lwcChart) {
+    lwcChart.remove();
+    lwcChart = null;
+    lwcCandleSeries = null;
+    lwcVolumeSeries = null;
+  }
+}
+
+function ensureLwcChart(container) {
+  if (typeof LightweightCharts === "undefined") {
+    container.innerHTML = '<p class="chart-lwc-fallback">图表库加载失败</p>';
+    return null;
+  }
+
+  destroyLwcChart();
+  const { w, h } = modalSize();
+  container.style.width = `${w}px`;
+  container.style.height = `${h}px`;
+
+  lwcChart = LightweightCharts.createChart(container, {
+    width: w,
+    height: h,
+    layout: {
+      background: { color: COLORS.bg },
+      textColor: COLORS.text,
+    },
+    grid: {
+      vertLines: { color: COLORS.grid },
+      horzLines: { color: COLORS.grid },
+    },
+    crosshair: { mode: LightweightCharts.CrosshairMode.Normal },
+    rightPriceScale: { borderColor: COLORS.grid },
+    timeScale: {
+      borderColor: COLORS.grid,
+      timeVisible: true,
+      secondsVisible: false,
+    },
+  });
+
+  lwcCandleSeries = lwcChart.addCandlestickSeries({
+    upColor: COLORS.up,
+    downColor: COLORS.down,
+    borderUpColor: COLORS.up,
+    borderDownColor: COLORS.down,
+    wickUpColor: COLORS.up,
+    wickDownColor: COLORS.down,
+  });
+
+  lwcVolumeSeries = lwcChart.addHistogramSeries({
+    priceFormat: { type: "volume" },
+    priceScaleId: "",
+  });
+  lwcVolumeSeries.priceScale().applyOptions({
+    scaleMargins: { top: 0.82, bottom: 0 },
+  });
+
+  lwcResizeObserver = new ResizeObserver(() => {
+    if (!lwcChart || !container.isConnected) return;
+    const rect = container.getBoundingClientRect();
+    if (rect.width > 0 && rect.height > 0) {
+      lwcChart.applyOptions({ width: rect.width, height: rect.height });
+    }
+  });
+  lwcResizeObserver.observe(container);
+
+  return lwcChart;
+}
+
+function renderLwcChart(candles, interval) {
+  const container = document.getElementById("chart-modal-container");
+  if (!container) return;
+
+  if (!lwcChart) ensureLwcChart(container);
+  if (!lwcCandleSeries || !lwcVolumeSeries) return;
+
+  const { ohlc, vol } = candlesToLwc(candles, interval);
+  lwcCandleSeries.setData(ohlc);
+  lwcVolumeSeries.setData(vol);
+  lwcChart.timeScale().fitContent();
+}
+
+function updateIntervalTabs() {
+  document.querySelectorAll(".chart-interval-btn").forEach((btn) => {
+    btn.classList.toggle("active", btn.dataset.interval === chartModalInterval);
+  });
+}
+
+function updateModalMeta(candles, source, interval) {
+  const title = document.getElementById("chart-modal-title");
+  const hint = document.getElementById("chart-modal-hint");
+  if (title) {
+    title.textContent = `${chartModalSymbol} · ${interval.toUpperCase()} K线`;
+  }
+  if (hint) {
+    hint.textContent = `${candles.length} 根 · ${sourceLabel(source)} · 滚轮缩放 · 拖拽平移 · 十字线 · Esc 退出`;
+  }
+}
+
+async function loadModalChart(interval) {
+  chartModalInterval = interval;
+  updateIntervalTabs();
+
+  const container = document.getElementById("chart-modal-container");
+  const hint = document.getElementById("chart-modal-hint");
+  if (hint) hint.textContent = "加载中…";
+
+  try {
+    const { candles, source } = await fetchKlines(chartModalSymbol, interval);
+    if (!candles.length) throw new Error("无K线数据");
+    renderLwcChart(candles, interval);
+    updateModalMeta(candles, source, interval);
+  } catch (e) {
+    if (hint) hint.textContent = `加载失败: ${e.message}`;
+    destroyLwcChart();
+    if (container) {
+      container.innerHTML = `<p class="chart-lwc-fallback">${e.message}</p>`;
+    }
+  }
+}
 
 function closeChartModal() {
   const modal = document.getElementById("chart-modal");
   if (!modal) return;
   modal.classList.add("hidden");
+  destroyLwcChart();
+  chartModalSymbol = "";
   if (document.fullscreenElement) {
     document.exitFullscreen?.().catch(() => {});
   }
 }
 
-function openChartModal(symbol) {
-  const candles = chartDataCache.get(symbol);
-  if (!candles?.length) return;
+async function openChartModal(symbol) {
+  const key = cacheKey(symbol, DEFAULT_MINI_INTERVAL);
+  const cached = chartDataCache.get(key);
+  if (!cached?.candles?.length) {
+    try {
+      await fetchKlines(symbol, DEFAULT_MINI_INTERVAL);
+    } catch {
+      return;
+    }
+  }
 
   chartModalSymbol = symbol;
+  chartModalInterval = DEFAULT_MINI_INTERVAL;
+
   const modal = document.getElementById("chart-modal");
   modal.classList.remove("hidden");
-  document.getElementById("chart-modal-title").textContent =
-    `${symbol} · 日K + 成交量（${candles.length} 根）`;
-  const canvas = document.getElementById("chart-modal-canvas");
-  drawCandlestickChart(canvas, candles, { large: true });
+
+  const container = document.getElementById("chart-modal-container");
+  if (container) container.innerHTML = "";
+
+  await loadModalChart(DEFAULT_MINI_INTERVAL);
 
   const inner = modal.querySelector(".chart-modal-inner");
   const req = inner.requestFullscreen || inner.webkitRequestFullscreen;
@@ -308,13 +482,31 @@ function setupChartModal() {
     modal.innerHTML = `
       <div class="chart-modal-inner">
         <button type="button" class="chart-modal-close" aria-label="关闭">×</button>
-        <h3 id="chart-modal-title"></h3>
-        <p class="chart-modal-hint">日K + 成交量 · 300根 · 点击全屏 · Esc 退出</p>
+        <div class="chart-modal-head">
+          <h3 id="chart-modal-title"></h3>
+          <div class="chart-interval-tabs" id="chart-interval-tabs"></div>
+        </div>
+        <p class="chart-modal-hint" id="chart-modal-hint"></p>
         <div class="chart-modal-canvas-wrap">
-          <canvas id="chart-modal-canvas"></canvas>
+          <div id="chart-modal-container" class="chart-lwc-container"></div>
         </div>
       </div>`;
     document.body.appendChild(modal);
+
+    const tabs = modal.querySelector("#chart-interval-tabs");
+    CHART_INTERVALS.forEach((iv) => {
+      const btn = document.createElement("button");
+      btn.type = "button";
+      btn.className = "chart-interval-btn";
+      btn.dataset.interval = iv;
+      btn.textContent = iv;
+      btn.addEventListener("click", () => {
+        if (iv === chartModalInterval || !chartModalSymbol) return;
+        loadModalChart(iv);
+      });
+      tabs.appendChild(btn);
+    });
+
     modal.querySelector(".chart-modal-close").onclick = closeChartModal;
     modal.addEventListener("click", (e) => {
       if (e.target === modal) closeChartModal();
@@ -323,11 +515,12 @@ function setupChartModal() {
       if (e.key === "Escape") closeChartModal();
     });
     document.addEventListener("fullscreenchange", () => {
-      if (!chartModalSymbol) return;
-      const canvas = document.getElementById("chart-modal-canvas");
-      const candles = chartDataCache.get(chartModalSymbol);
-      if (canvas && candles?.length) {
-        drawCandlestickChart(canvas, candles, { large: true });
+      if (!chartModalSymbol || !lwcChart) return;
+      const container = document.getElementById("chart-modal-container");
+      if (!container) return;
+      const rect = container.getBoundingClientRect();
+      if (rect.width > 0 && rect.height > 0) {
+        lwcChart.applyOptions({ width: rect.width, height: rect.height });
       }
     });
   }
diff --git a/web/index.html b/web/index.html
index fea1d7a..fd6819d 100644
--- a/web/index.html
+++ b/web/index.html
@@ -92,6 +92,7 @@
     <span id="push-status" class="push-status"></span>
   </footer>
 
+  <script src="https://unpkg.com/lightweight-charts@4.2.0/dist/lightweight-charts.standalone.production.js"></script>
   <script src="/static/charts.js"></script>
   <script src="/static/funding.js"></script>
   <script src="/static/app.js"></script>
diff --git a/web/style.css b/web/style.css
index 6a3dd57..f024c5c 100644
--- a/web/style.css
+++ b/web/style.css
@@ -352,9 +352,71 @@ button:hover {
 .chart-modal-inner:fullscreen .chart-modal-canvas-wrap {
   flex: 1;
   display: flex;
-  align-items: center;
-  justify-content: center;
+  flex-direction: column;
   overflow: hidden;
+  min-height: 0;
+}
+
+.chart-modal-inner:fullscreen .chart-lwc-container {
+  flex: 1;
+  width: 100% !important;
+  height: 100% !important;
+  min-height: 0;
+}
+
+.chart-modal-head {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 0.75rem 1rem;
+  margin-bottom: 0.25rem;
+}
+
+.chart-interval-tabs {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.35rem;
+}
+
+.chart-interval-btn {
+  padding: 0.25rem 0.55rem;
+  font-size: 0.78rem;
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  background: var(--bg);
+  color: var(--muted);
+  cursor: pointer;
+}
+
+.chart-interval-btn:hover {
+  color: var(--text);
+  border-color: var(--accent);
+}
+
+.chart-interval-btn.active {
+  background: var(--accent);
+  border-color: var(--accent);
+  color: #0d1118;
+  font-weight: 600;
+}
+
+.chart-lwc-container {
+  width: 100%;
+  min-height: 480px;
+}
+
+.chart-lwc-fallback {
+  padding: 2rem;
+  text-align: center;
+  color: var(--muted);
+}
+
+.chart-modal-inner:fullscreen .chart-modal-head {
+  flex-shrink: 0;
+}
+
+.chart-modal-inner:fullscreen .chart-modal-hint {
+  flex-shrink: 0;
 }
 
 .stats-table .stats-total-vol {
@@ -468,7 +530,7 @@ button:hover {
 }
 
 .chart-modal-canvas-wrap {
-  overflow: auto;
+  overflow: hidden;
   border-radius: 8px;
   border: 1px solid var(--border);
   background: #0d1118;