diff --git a/src/_MainPage/components/HeroSection.tsx b/src/_MainPage/components/HeroSection.tsx
index 3397db2..c908375 100644
--- a/src/_MainPage/components/HeroSection.tsx
+++ b/src/_MainPage/components/HeroSection.tsx
@@ -6,8 +6,8 @@ import { Link } from "react-router-dom";
 
 export default function HeroSection() {
   return (
-    <div className="flex flex-col justify-center items-center py-20 sm:py-32 text-center">
-      <h1 className="font-bold text-white text-4xl sm:text-6xl tracking-tight">
+    <div className="flex flex-col justify-center items-center px-4 py-10 sm:py-20 md:py-32 text-center">
+      <h1 className="px-4 font-bold text-white text-3xl sm:text-4xl md:text-6xl tracking-tight">
         {HERO_CONTENT.title.split("\n").map((line, i) => (
           <React.Fragment key={i}>
             {line}
@@ -15,22 +15,36 @@ export default function HeroSection() {
           </React.Fragment>
         ))}
       </h1>
-      <p className="mt-6 max-w-2xl text-gray-300 text-lg">
-        {HERO_CONTENT.description.split("\n").map((line, i) => (
-          <React.Fragment key={i}>
-            {line}
-            <br />
-          </React.Fragment>
-        ))}
+      <p className="mt-4 sm:mt-6 px-4 max-w-2xl text-gray-300 text-base sm:text-lg">
+        {/* 모바일 환경에서만 표시되는 텍스트 */}
+        <span className="sm:hidden block">
+          {"과거 시장 데이터를 기반으로\n당신의 투자 전략을 시뮬레이션하여\n수익률과 안정성을 미리 예측할 수 있습니다."
+            .split("\n")
+            .map((line, i) => (
+              <React.Fragment key={i}>
+                {line}
+                <br />
+              </React.Fragment>
+            ))}
+        </span>
+        {/* 태블릿 이상 환경에서 표시되는 텍스트 */}
+        <span className="hidden sm:block">
+          {HERO_CONTENT.description.split("\n").map((line, i) => (
+            <React.Fragment key={i}>
+              {line}
+              <br />
+            </React.Fragment>
+          ))}
+        </span>
       </p>
       <Button
         asChild
         size="lg"
-        className="bg-blue-500 hover:bg-blue-600 mt-10 px-9 py-6 rounded-full text-[1rem] text-white"
+        className="bg-blue-500 hover:bg-blue-600 mt-6 sm:mt-10 px-6 sm:px-9 py-4 sm:py-6 rounded-full text-white md:text-[1rem] text-sm sm:text-base"
       >
         <Link to="/backtest">
           {HERO_CONTENT.cta}
-          <ArrowRight className="ml-1 w-5 h-5" />
+          <ArrowRight className="ml-1 w-4 sm:w-5 h-4 sm:h-5" />
         </Link>
       </Button>
     </div>
diff --git a/src/_MainPage/components/MarketIndexCard.tsx b/src/_MainPage/components/MarketIndexCard.tsx
index 00c947a..46bcfa6 100644
--- a/src/_MainPage/components/MarketIndexCard.tsx
+++ b/src/_MainPage/components/MarketIndexCard.tsx
@@ -30,13 +30,15 @@ const MarketIndexCard = ({ marketType, marketIndex, isLoading, error }: MarketIn
   // 로딩 상태
   if (isLoading) {
     return (
-      <Card className="bg-[#0A194E] border-gray-700 text-white">
-        <CardHeader>
-          <CardTitle className="font-medium text-gray-300 text-lg">{marketType}</CardTitle>
+      <Card className="gap-1 sm:gap-6 bg-[#0A194E] py-3 sm:py-6 border-gray-700 text-white">
+        <CardHeader className="gap-1 sm:gap-1.5 px-4 sm:px-6">
+          <CardTitle className="font-medium text-gray-300 text-base sm:text-lg">
+            {marketType}
+          </CardTitle>
         </CardHeader>
-        <CardContent>
+        <CardContent className="px-4 sm:px-6">
           <div className="flex justify-center items-center h-48">
-            <Spinner className="size-12" />
+            <Spinner className="size-8 sm:size-12" />
           </div>
         </CardContent>
       </Card>
@@ -50,13 +52,15 @@ const MarketIndexCard = ({ marketType, marketIndex, isLoading, error }: MarketIn
       axiosError.response?.data?.detail || "데이터를 불러오는 중 오류가 발생했습니다.";
 
     return (
-      <Card className="bg-[#0A194E] border-gray-700 text-white">
-        <CardHeader>
-          <CardTitle className="font-medium text-gray-300 text-lg">{marketType}</CardTitle>
+      <Card className="gap-1 sm:gap-6 bg-[#0A194E] py-3 sm:py-6 border-gray-700 text-white">
+        <CardHeader className="gap-1 sm:gap-1.5 px-4 sm:px-6">
+          <CardTitle className="font-medium text-gray-300 text-base sm:text-lg">
+            {marketType}
+          </CardTitle>
         </CardHeader>
-        <CardContent>
+        <CardContent className="px-4 sm:px-6">
           <div className="flex justify-center items-center h-48">
-            <p className="text-red-500 text-center">{errorMessage}</p>
+            <p className="text-red-500 text-sm sm:text-base text-center">{errorMessage}</p>
           </div>
         </CardContent>
       </Card>
@@ -66,13 +70,15 @@ const MarketIndexCard = ({ marketType, marketIndex, isLoading, error }: MarketIn
   // 데이터가 없는 경우
   if (!marketIndex) {
     return (
-      <Card className="bg-[#0A194E] border-gray-700 text-white">
-        <CardHeader>
-          <CardTitle className="font-medium text-gray-300 text-lg">{marketType}</CardTitle>
+      <Card className="gap-1 sm:gap-6 bg-[#0A194E] py-3 sm:py-6 border-gray-700 text-white">
+        <CardHeader className="gap-1 sm:gap-1.5 px-4 sm:px-6">
+          <CardTitle className="font-medium text-gray-300 text-base sm:text-lg">
+            {marketType}
+          </CardTitle>
         </CardHeader>
-        <CardContent>
+        <CardContent className="px-4 sm:px-6">
           <div className="flex justify-center items-center h-48">
-            <p className="text-gray-400">데이터가 없습니다.</p>
+            <p className="text-gray-400 text-sm sm:text-base">데이터가 없습니다.</p>
           </div>
         </CardContent>
       </Card>
@@ -84,13 +90,15 @@ const MarketIndexCard = ({ marketType, marketIndex, isLoading, error }: MarketIn
 
   if (!latestData) {
     return (
-      <Card className="bg-[#0A194E] border-gray-700 text-white">
-        <CardHeader>
-          <CardTitle className="font-medium text-gray-300 text-lg">{marketType}</CardTitle>
+      <Card className="gap-1 sm:gap-6 bg-[#0A194E] py-3 sm:py-6 border-gray-700 text-white">
+        <CardHeader className="gap-1 sm:gap-1.5 px-4 sm:px-6">
+          <CardTitle className="font-medium text-gray-300 text-base sm:text-lg">
+            {marketType}
+          </CardTitle>
         </CardHeader>
-        <CardContent>
+        <CardContent className="px-4 sm:px-6">
           <div className="flex justify-center items-center h-48">
-            <p className="text-gray-400">데이터가 없습니다.</p>
+            <p className="text-gray-400 text-sm sm:text-base">데이터가 없습니다.</p>
           </div>
         </CardContent>
       </Card>
@@ -108,18 +116,22 @@ const MarketIndexCard = ({ marketType, marketIndex, isLoading, error }: MarketIn
   }));
 
   return (
-    <Card className="bg-[#0A194E] border-gray-700 text-white">
-      <CardHeader>
-        <CardTitle className="font-medium text-gray-300 text-lg">{marketType}</CardTitle>
+    <Card className="gap-1 sm:gap-6 bg-[#0A194E] py-2 sm:py-6 border-gray-700 text-white">
+      <CardHeader className="gap-1 sm:gap-1.5 px-4 sm:px-6 pt-2">
+        <CardTitle className="font-medium text-gray-300 text-base sm:text-lg">
+          {marketType}
+        </CardTitle>
       </CardHeader>
 
-      <CardContent>
-        <p className="font-bold text-4xl">{latestData.closePrice.toLocaleString()}</p>
-        <p className={`mt-2 text-lg font-semibold ${getChangeColor(latestData.changeRate)}`}>
+      <CardContent className="px-4 sm:px-6">
+        <p className="font-bold text-2xl sm:text-4xl">{latestData.closePrice.toLocaleString()}</p>
+        <p
+          className={`mt-1.5 sm:mt-2 text-sm sm:text-lg font-semibold ${getChangeColor(latestData.changeRate)}`}
+        >
           {arrow} {Math.abs(latestData.changeAmount).toFixed(2)} ({sign}
           {latestData.changeRate.toFixed(2)}%)
         </p>
-        <div className="mt-4 h-24">
+        <div className="mt-3 sm:mt-4 h-24">
           <ResponsiveContainer width="100%" height="100%">
             <AreaChart data={chartData}>
               <YAxis domain={["dataMin - 10", "dataMax + 10"]} hide />
diff --git a/src/components/Navbar/Logo.tsx b/src/components/Navbar/Logo.tsx
index 402eb2c..5066f6c 100644
--- a/src/components/Navbar/Logo.tsx
+++ b/src/components/Navbar/Logo.tsx
@@ -2,8 +2,10 @@ import { Link } from "react-router-dom";
 
 const Logo = () => {
   return (
-    <div className="flex items-center justify-center bg-transparent font-lalezar text-[6.25rem]">
-      <Link to="/">STPT</Link>
+    <div className="flex justify-center items-center bg-transparent pt-2 font-lalezar text-[4rem] md:text-[6.25rem]">
+      <Link to="/" className="pt-2">
+        STPT
+      </Link>
     </div>
   );
 };
diff --git a/src/components/Navbar/Navbar.tsx b/src/components/Navbar/Navbar.tsx
index 099ca98..f7b9822 100644
--- a/src/components/Navbar/Navbar.tsx
+++ b/src/components/Navbar/Navbar.tsx
@@ -1,17 +1,82 @@
 import Logo from "@/components/Navbar/Logo";
 import NavItem from "@/components/Navbar/NavItem";
 import SearchBar from "@/components/Navbar/SearchBar";
+import SideBarButton from "@/components/Navbar/SideBarButton";
+import { Link } from "react-router-dom";
+import { useState, useEffect, useRef } from "react";
 
 const Navbar = () => {
+  const [isSideBarOpen, setIsSideBarOpen] = useState(false);
+  const modalRef = useRef<HTMLDivElement>(null);
+  const buttonRef = useRef<HTMLDivElement>(null);
+
+  // 외부 클릭 시 모달 닫기
+  useEffect(() => {
+    const handleClickOutside = (event: MouseEvent) => {
+      const target = event.target as Node;
+      if (
+        modalRef.current &&
+        !modalRef.current.contains(target) &&
+        buttonRef.current &&
+        !buttonRef.current.contains(target)
+      ) {
+        setIsSideBarOpen(false);
+      }
+    };
+
+    if (isSideBarOpen) {
+      document.addEventListener("mousedown", handleClickOutside);
+    }
+
+    return () => {
+      document.removeEventListener("mousedown", handleClickOutside);
+    };
+  }, [isSideBarOpen]);
+
   return (
-    <nav className="relative flex gap-16 bg-transparent mr-[3.25rem] ml-[2.6875rem] w-auto h-40">
-      <Logo />
-      <ul className="relative flex gap-[3.75rem] p-0 w-full">
-        <NavItem to="portfolio" label="Portfolios" />
-        <NavItem to="markets" label="Markets" />
-      </ul>
-      <SearchBar />
-    </nav>
+    <>
+      <nav className="z-50 relative flex justify-between items-center gap-16 bg-transparent mx-[2rem] sm:mx-[3rem] w-auto md:h-40">
+        <Logo />
+        <div className="relative" ref={buttonRef}>
+          <SideBarButton isOpen={isSideBarOpen} onClick={() => setIsSideBarOpen(!isSideBarOpen)} />
+
+          {/* 드롭다운 - 사이드바 버튼 아래에 표시 */}
+          {isSideBarOpen && (
+            <div
+              ref={modalRef}
+              className="md:hidden top-full right-0 z-50 absolute bg-[#0A194E] slide-in-from-top-2 shadow-lg mt-2 border border-gray-700 rounded-lg min-w-[150px] animate-in duration-200 fade-in"
+            >
+              <div className="p-4">
+                <p className="opacity-45 mb-2 text-white text-sm">Menu</p>
+                <div className="flex flex-col gap-">
+                  <Link
+                    to="/portfolio"
+                    className="hover:opacity-100 py-1 font-bold text-white text-base transition-opacity"
+                    onClick={() => setIsSideBarOpen(false)}
+                  >
+                    Portfolio
+                  </Link>
+                  <Link
+                    to="/markets"
+                    className="hover:opacity-100 py-1 font-bold text-white text-base transition-opacity"
+                    onClick={() => setIsSideBarOpen(false)}
+                  >
+                    Markets
+                  </Link>
+                </div>
+              </div>
+            </div>
+          )}
+        </div>
+        <div className="hidden md:flex md:flex-row md:justify-between md:items-center md:gap-16 md:w-full">
+          <ul className="relative flex gap-[3.75rem] p-0 w-full">
+            <NavItem to="portfolio" label="Portfolios" />
+            <NavItem to="markets" label="Markets" />
+          </ul>
+          <SearchBar />
+        </div>
+      </nav>
+    </>
   );
 };
 
diff --git a/src/components/Navbar/SideBarButton.tsx b/src/components/Navbar/SideBarButton.tsx
new file mode 100644
index 0000000..505ad0e
--- /dev/null
+++ b/src/components/Navbar/SideBarButton.tsx
@@ -0,0 +1,34 @@
+import { Button } from "@/components/ui/button";
+
+interface SideBarButtonProps {
+  isOpen: boolean;
+  onClick: () => void;
+}
+
+export default function SideBarButton({ isOpen, onClick }: SideBarButtonProps) {
+  return (
+    <Button
+      variant="ghost"
+      className="md:hidden relative flex flex-col justify-center items-center gap-1.5 bg-transparent p-2 border border-white/20 rounded-xl w-12 h-12 transition-colors hover:transparent"
+      onClick={onClick}
+    >
+      <span
+        className={`bg-white rounded-full w-5 h-0.5 transition-all duration-300 ease-in-out ${
+          isOpen ? "rotate-45 translate-y-2" : ""
+        }`}
+      ></span>
+
+      <span
+        className={`bg-white rounded-full w-5 h-0.5 transition-all duration-300 ease-in-out ${
+          isOpen ? "opacity-0" : "opacity-100"
+        }`}
+      ></span>
+
+      <span
+        className={`bg-white rounded-full w-5 h-0.5 transition-all duration-300 ease-in-out ${
+          isOpen ? "-rotate-45 -translate-y-2" : ""
+        }`}
+      ></span>
+    </Button>
+  );
+}