diff --git a/src/App.tsx b/src/App.tsx
index c8e2cd8..f60e661 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,4 +1,4 @@
-import React, { useState, useEffect, useCallback, useMemo } from 'react';
+import React, { useState, useEffect, useCallback, useMemo, useRef } from 'react';
 import {
   Truck,
   Warehouse,
@@ -35,6 +35,76 @@ import type { SummaryData, TypeSummary, VehicleListItem, DeptGroup, RegionGroup,
 import { fetchSummary, fetchByType, fetchVehicleList, fetchWeeklyDetail, fetchDeptStats, fetchRegionStats, fetchCustomerStats, fetchInventoryStats, fetchRegionChart } from './api';
 import type { WeeklyDetailItem } from './api';
 
+// --- SearchSelect Component ---
+function SearchSelect({ value, onChange, options, placeholder, className }: {
+  value: string;
+  onChange: (v: string) => void;
+  options: string[];
+  placeholder: string;
+  className?: string;
+}) {
+  const [open, setOpen] = useState(false);
+  const [query, setQuery] = useState('');
+  const ref = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const handler = (e: MouseEvent) => {
+      if (ref.current && !ref.current.contains(e.target as Node)) setOpen(false);
+    };
+    document.addEventListener('mousedown', handler);
+    return () => document.removeEventListener('mousedown', handler);
+  }, []);
+
+  const filtered = useMemo(() => {
+    if (!query) return options;
+    const q = query.toLowerCase();
+    return options.filter((o) => o.toLowerCase().includes(q));
+  }, [options, query]);
+
+  const displayValue = value || '';
+
+  return (
+    <div ref={ref} className="relative">
+      <div
+        className={`flex items-center bg-white border border-gray-200 rounded-lg shadow-sm cursor-pointer transition-all focus-within:ring-2 focus-within:ring-blue-500/20 focus-within:border-blue-500 ${className || 'text-xs py-1.5 px-2'}`}
+        onClick={() => setOpen(!open)}
+      >
+        <input
+          type="text"
+          className="flex-1 outline-none bg-transparent min-w-0 text-inherit"
+          placeholder={displayValue || placeholder}
+          value={open ? query : displayValue}
+          onChange={(e) => { setQuery(e.target.value); if (!open) setOpen(true); }}
+          onFocus={() => { setOpen(true); setQuery(''); }}
+        />
+        <ChevronDown size={14} className={`text-gray-400 shrink-0 transition-transform ${open ? 'rotate-180' : ''}`} />
+      </div>
+      {open && (
+        <div className="absolute z-50 left-0 right-0 mt-1 bg-white border border-gray-200 rounded-lg shadow-xl max-h-48 overflow-auto">
+          <div
+            className="px-2 py-1.5 text-xs text-gray-400 cursor-pointer hover:bg-gray-50"
+            onClick={() => { onChange(''); setQuery(''); setOpen(false); }}
+          >
+            {placeholder}
+          </div>
+          {filtered.map((o) => (
+            <div
+              key={o}
+              className={`px-2 py-1.5 text-xs cursor-pointer hover:bg-blue-50 transition-colors ${o === value ? 'bg-blue-50 text-blue-600 font-bold' : 'text-gray-700'}`}
+              onClick={() => { onChange(o); setQuery(''); setOpen(false); }}
+            >
+              {o}
+            </div>
+          ))}
+          {filtered.length === 0 && (
+            <div className="px-2 py-3 text-xs text-gray-400 text-center">无匹配项</div>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
+
 // --- Constants ---
 const TABS = [
   { id: 'overview', label: '总览' },
@@ -983,10 +1053,7 @@ export default function App() {
                           </div>
                           <div>
                             <label className="text-[10px] text-slate-400 block mb-1">车型名称</label>
-                            <select value={inventoryFilters.model} onChange={(e) => setInventoryFilters({...inventoryFilters, model: e.target.value})} className="w-full text-xs bg-white border border-slate-200 rounded-lg px-2 py-1.5 focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 transition-all shadow-sm cursor-pointer">
-                              <option value="">全部车型</option>
-                              {uniqueInventoryModels.map(m => <option key={m} value={m}>{m}</option>)}
-                            </select>
+                            <SearchSelect value={inventoryFilters.model} onChange={(v) => setInventoryFilters({...inventoryFilters, model: v})} options={uniqueInventoryModels} placeholder="全部车型" />
                           </div>
                         </div>
                       </motion.div>
@@ -1872,10 +1939,7 @@ export default function App() {
                       <div className="space-y-4">
                         <div className="space-y-1.5">
                           <label className="text-[10px] font-bold text-gray-400 uppercase tracking-wider">客户名称</label>
-                          <select className="w-full bg-white border border-gray-200 rounded-lg py-2 px-2 text-xs focus:ring-2 focus:ring-slate-500/20 focus:border-slate-500 outline-none transition-all cursor-pointer shadow-sm" value={regionFilters.customer} onChange={(e) => setRegionFilters(prev => ({ ...prev, customer: e.target.value }))}>
-                            <option value="">所有客户</option>
-                            {uniqueCustomerNames.map(c => <option key={c} value={c}>{c}</option>)}
-                          </select>
+                          <SearchSelect value={regionFilters.customer} onChange={(v) => setRegionFilters(prev => ({ ...prev, customer: v }))} options={uniqueCustomerNames} placeholder="所有客户" className="text-xs py-2 px-2" />
                         </div>
 
                         <div className="grid grid-cols-2 gap-3">
@@ -2180,18 +2244,12 @@ export default function App() {
                       <div className="space-y-4">
                         <div className="space-y-1.5">
                           <label className="text-[10px] font-bold text-gray-400 uppercase tracking-wider">客户名称</label>
-                          <select className="w-full bg-white border border-gray-200 rounded-lg py-2 px-2 text-xs focus:ring-2 focus:ring-emerald-500/20 focus:border-emerald-500 outline-none transition-all cursor-pointer shadow-sm" value={customerFilters.customer} onChange={(e) => setCustomerFilters(prev => ({ ...prev, customer: e.target.value }))}>
-                            <option value="">所有客户</option>
-                            {uniqueCustomerNames.map(c => <option key={c} value={c}>{c}</option>)}
-                          </select>
+                          <SearchSelect value={customerFilters.customer} onChange={(v) => setCustomerFilters(prev => ({ ...prev, customer: v }))} options={uniqueCustomerNames} placeholder="所有客户" className="text-xs py-2 px-2" />
                         </div>
 
                         <div className="space-y-1.5">
                           <label className="text-[10px] font-bold text-gray-400 uppercase tracking-wider">业务负责人</label>
-                          <select className="w-full bg-white border border-gray-200 rounded-lg py-2 px-2 text-xs focus:ring-2 focus:ring-emerald-500/20 focus:border-emerald-500 outline-none transition-all cursor-pointer shadow-sm" value={customerFilters.manager} onChange={(e) => setCustomerFilters(prev => ({ ...prev, manager: e.target.value }))}>
-                            <option value="">所有负责人</option>
-                            {uniqueCustomerManagers.map(m => <option key={m} value={m}>{m}</option>)}
-                          </select>
+                          <SearchSelect value={customerFilters.manager} onChange={(v) => setCustomerFilters(prev => ({ ...prev, manager: v }))} options={uniqueCustomerManagers} placeholder="所有负责人" className="text-xs py-2 px-2" />
                         </div>
 
                         <div className="grid grid-cols-2 gap-3">
@@ -2466,10 +2524,7 @@ export default function App() {
                       {/* Quick Search always visible when collapsed */}
                       {!isModalFilterExpanded && (
                         <div className="w-40 sm:w-64" onClick={(e) => e.stopPropagation()}>
-                          <select value={modalFilters.plateNumber} onChange={(e) => setModalFilters({...modalFilters, plateNumber: e.target.value})} className="w-full text-[11px] px-2 py-1 bg-white border border-gray-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 transition-all shadow-sm cursor-pointer">
-                            <option value="">快速搜索车牌...</option>
-                            {uniqueModalPlates.map(p => <option key={p} value={p}>{p}</option>)}
-                          </select>
+                          <SearchSelect value={modalFilters.plateNumber} onChange={(v) => setModalFilters({...modalFilters, plateNumber: v})} options={uniqueModalPlates} placeholder="快速搜索车牌..." className="text-[11px] py-1 px-2" />
                         </div>
                       )}
                       <motion.div
@@ -2492,10 +2547,7 @@ export default function App() {
                         <div className="grid grid-cols-2 sm:grid-cols-4 gap-3 py-3 border-t border-gray-100 mt-1">
                           <div className="space-y-1">
                             <label className="block text-[10px] text-gray-500 font-medium">车牌号码</label>
-                            <select value={modalFilters.plateNumber} onChange={(e) => setModalFilters({...modalFilters, plateNumber: e.target.value})} className="w-full text-[11px] px-2 py-1.5 bg-white border border-gray-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 transition-all shadow-sm cursor-pointer">
-                              <option value="">全部车牌</option>
-                              {uniqueModalPlates.map(p => <option key={p} value={p}>{p}</option>)}
-                            </select>
+                            <SearchSelect value={modalFilters.plateNumber} onChange={(v) => setModalFilters({...modalFilters, plateNumber: v})} options={uniqueModalPlates} placeholder="全部车牌" className="text-[11px] py-1.5 px-2" />
                           </div>
                           <div className="space-y-1">
                             <label className="block text-[10px] text-gray-500 font-medium">车型型号</label>