feat: Add Effect Lab page with an interactive Three.js sword stream animation.

2. API 호출 병렬 처리
3. UI개선 - 로딩 경험 개선
4. 반응형 디자인
5. API 통신 특이사항 - URL 구성 로직의 잠재적 위험 해결

package-lock.json

@@ -12,7 +12,8 @@
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
         "react-leaflet": "^4.2.1",
-        "react-router-dom": "^6.30.3"
+        "react-router-dom": "^6.30.3",
+        "three": "^0.182.0"
       },
       "devDependencies": {
         "@eslint/js": "^9.39.1",
@@ -2921,6 +2922,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/three": {
+      "version": "0.182.0",
+      "resolved": "https://registry.npmjs.org/three/-/three-0.182.0.tgz",
+      "integrity": "sha512-GbHabT+Irv+ihI1/f5kIIsZ+Ef9Sl5A1Y7imvS5RQjWgtTPfPnZ43JmlYI7NtCRDK9zir20lQpfg8/9Yd02OvQ==",
+      "license": "MIT"
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.15",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",

package.json

@@ -17,7 +17,8 @@
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-leaflet": "^4.2.1",
-    "react-router-dom": "^6.30.3"
+    "react-router-dom": "^6.30.3",
+    "three": "^0.182.0"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.1",

src/App.css

@@ -26,11 +26,18 @@
     }
 }
 
+.suspend-loading {
+    display: grid;
+    place-items: center;
+    min-height: 50vh;
+}
+
 @keyframes fadeUp {
     from {
         opacity: 0;
         transform: translateY(16px);
     }
+
     to {
         opacity: 1;
         transform: translateY(0);

src/App.jsx

@@ -1,6 +1,7 @@
 import React from 'react';
 import { Outlet } from 'react-router-dom';
 import Navbar from './components/Navbar';
+import Loading from './components/Loading';
 import './App.css';
 
 function App() {
@@ -8,7 +9,9 @@ function App() {
         <div className="app-shell">
             <Navbar />
             <main className="site-main">
+                <React.Suspense fallback={<div className="suspend-loading"><Loading /></div>}>
                     <Outlet />
+                </React.Suspense>
             </main>
         </div>
     );

src/api.js

@@ -4,20 +4,19 @@ const API_BASE = import.meta.env.VITE_API_BASE || "";
 const toApiUrl = (path) => {
   if (!API_BASE) return path;
 
-  const baseClean = API_BASE.replace(/\/+$/, "");
-  const baseForJoin = `${baseClean}/`;
-  const normalizedPath = path.startsWith("/") ? path.slice(1) : path;
-  let pathForJoin = normalizedPath;
-
-  if (baseClean.endsWith("/api") && normalizedPath.startsWith("api/")) {
-    pathForJoin = normalizedPath.slice(4);
+  try {
+    const base = new URL(API_BASE, window.location.origin);
+    // Ensure base pathname ends with '/' if it's not the root or if likely intended as a directory
+    if (!base.pathname.endsWith('/')) {
+        base.pathname += '/';
     }
     
-  try {
-    const baseUrl = new URL(baseForJoin, window.location.origin);
-    return new URL(pathForJoin, baseUrl).toString();
+    // Remove leading slash from path to avoid double slashes when joining
+    const cleanPath = path.startsWith('/') ? path.slice(1) : path;
+    
+    return new URL(cleanPath, base).toString();
   } catch (error) {
-    console.warn("Invalid VITE_API_BASE, falling back to relative URL.", error);
+    console.error("Invalid VITE_API_BASE configuration:", error);
     return path;
   }
 };

src/components/Loading.css

@@ -0,0 +1,58 @@
+.loading-spinner {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    padding: 20px;
+    gap: 12px;
+}
+
+.loading-spinner__circle {
+    width: 32px;
+    height: 32px;
+    border: 3px solid rgba(255, 255, 255, 0.1);
+    border-radius: 50%;
+    border-top-color: var(--accent, #f7a8a5);
+    animation: spin 0.8s linear infinite;
+}
+
+.loading-spinner__text {
+    font-size: 13px;
+    color: var(--muted, #b6b1a9);
+    margin: 0;
+}
+
+@keyframes spin {
+    to {
+        transform: rotate(360deg);
+    }
+}
+
+.loading-skeleton {
+    display: grid;
+    gap: 12px;
+    padding: 16px;
+    width: 100%;
+}
+
+.loading-skeleton__line {
+    height: 16px;
+    border-radius: 4px;
+    background: linear-gradient(
+        90deg, 
+        rgba(255, 255, 255, 0.05) 25%, 
+        rgba(255, 255, 255, 0.1) 50%, 
+        rgba(255, 255, 255, 0.05) 75%
+    );
+    background-size: 200% 100%;
+    animation: pulse 1.5s ease-in-out infinite;
+}
+
+@keyframes pulse {
+    0% {
+        background-position: 200% 0;
+    }
+    100% {
+        background-position: -200% 0;
+    }
+}

src/components/Loading.jsx

@@ -0,0 +1,23 @@
+import React from 'react';
+import './Loading.css';
+
+const Loading = ({ type = 'spinner', message = '로딩 중...' }) => {
+    if (type === 'skeleton') {
+        return (
+            <div className="loading-skeleton">
+                <div className="loading-skeleton__line" style={{ width: '60%' }}></div>
+                <div className="loading-skeleton__line" style={{ width: '80%' }}></div>
+                <div className="loading-skeleton__line" style={{ width: '40%' }}></div>
+            </div>
+        );
+    }
+
+    return (
+        <div className="loading-spinner">
+            <div className="loading-spinner__circle"></div>
+            {message && <p className="loading-spinner__text">{message}</p>}
+        </div>
+    );
+};
+
+export default Loading;

src/pages/effect-lab/EffectLab.css

@@ -0,0 +1,59 @@
+.effect-lab {
+    position: relative;
+    width: 100%;
+    height: 100%;
+    min-height: calc(100vh - 80px);
+    /* Adjust based on navbar height */
+    overflow: hidden;
+    background-color: #050505;
+    border-radius: 20px;
+    border: 1px solid var(--line);
+    display: flex;
+    flex-direction: column;
+}
+
+.effect-lab canvas {
+    display: block;
+    outline: none;
+}
+
+.effect-lab-overlay {
+    position: absolute;
+    top: 20px;
+    left: 20px;
+    color: rgba(255, 255, 255, 0.7);
+    pointer-events: none;
+    z-index: 10;
+}
+
+.effect-lab-overlay h2 {
+    margin: 0 0 8px;
+    font-family: var(--font-display);
+    font-size: 28px;
+    color: var(--text);
+    text-shadow: 0 0 20px rgba(68, 170, 221, 0.5);
+}
+
+.active-mode {
+    display: inline-block;
+    background: rgba(68, 170, 221, 0.1);
+    border: 1px solid rgba(68, 170, 221, 0.3);
+    padding: 6px 12px;
+    border-radius: 99px;
+    font-size: 12px;
+    color: #44aadd;
+    margin-bottom: 12px;
+    font-weight: 600;
+}
+
+.active-mode span {
+    color: #fff;
+}
+
+.effect-lab-overlay p {
+    margin: 0;
+    font-size: 14px;
+    color: var(--muted);
+    max-width: 400px;
+    line-height: 1.5;
+}

src/pages/effect-lab/EffectLab.jsx

@@ -0,0 +1,218 @@
+import React, { useEffect, useRef, useState } from 'react';
+import * as THREE from 'three';
+import './EffectLab.css';
+
+const EffectLab = () => {
+    const containerRef = useRef(null);
+    const requestRef = useRef();
+    const [mode, setMode] = useState('HOVER'); // HOVER, ATTACK, ORBIT
+
+    useEffect(() => {
+        if (!containerRef.current) return;
+
+        // --- Configuration ---
+        const COUNT = 1500;
+        const SWORD_COLOR = 0x44aadd;
+        const SWORD_EMISSIVE = 0x112244;
+
+        // --- Helper: Random Range ---
+        const rand = (min, max) => Math.random() * (max - min) + min;
+
+        // --- Setup Scene ---
+        const width = containerRef.current.clientWidth;
+        const height = containerRef.current.clientHeight;
+
+        const scene = new THREE.Scene();
+        scene.fog = new THREE.FogExp2(0x050505, 0.002);
+
+        const camera = new THREE.PerspectiveCamera(75, width / height, 0.1, 1000);
+        camera.position.z = 80;
+
+        const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true });
+        renderer.setSize(width, height);
+        renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
+        // Tone mapping for better glow look
+        renderer.toneMapping = THREE.ACESFilmicToneMapping;
+        containerRef.current.appendChild(renderer.domElement);
+
+        // --- Lighting ---
+        const ambientLight = new THREE.AmbientLight(0x404040);
+        scene.add(ambientLight);
+
+        const pointLight = new THREE.PointLight(SWORD_COLOR, 2, 100);
+        scene.add(pointLight);
+
+        // --- Geometry & Material ---
+        // Sword shape: Cone stretched
+        const geometry = new THREE.CylinderGeometry(0.1, 0.4, 4, 8);
+        geometry.rotateX(Math.PI / 2); // Point towards Z
+
+        const material = new THREE.MeshPhongMaterial({
+            color: SWORD_COLOR,
+            emissive: SWORD_EMISSIVE,
+            shininess: 100,
+            flatShading: true,
+        });
+
+        const mesh = new THREE.InstancedMesh(geometry, material, COUNT);
+        scene.add(mesh);
+
+        // --- Particle Data ---
+        const dummy = new THREE.Object3D();
+        const particles = [];
+
+        for (let i = 0; i < COUNT; i++) {
+            particles.push({
+                pos: new THREE.Vector3(rand(-100, 100), rand(-100, 100), rand(-50, 50)),
+                vel: new THREE.Vector3(),
+                acc: new THREE.Vector3(),
+                // Orbit parameters
+                angle: rand(0, Math.PI * 2),
+                radius: rand(15, 30),
+                speed: rand(0.02, 0.05),
+                // Offset for natural movement
+                offset: new THREE.Vector3(rand(-5, 5), rand(-5, 5), rand(-5, 5))
+            });
+        }
+
+        // --- Mouse & Interaction State ---
+        const mouse = new THREE.Vector3();
+        const target = new THREE.Vector3();
+        const mousePlane = new THREE.Plane(new THREE.Vector3(0, 0, 1), 0);
+        const raycaster = new THREE.Raycaster();
+
+        let isMouseDown = false;
+        let time = 0;
+
+        const handleMouseMove = (e) => {
+            const rect = renderer.domElement.getBoundingClientRect();
+            const x = ((e.clientX - rect.left) / rect.width) * 2 - 1;
+            const y = -((e.clientY - rect.top) / rect.height) * 2 + 1;
+
+            raycaster.setFromCamera(new THREE.Vector2(x, y), camera);
+            raycaster.ray.intersectPlane(mousePlane, mouse);
+
+            // Allow light to follow mouse
+            pointLight.position.copy(mouse);
+            pointLight.position.z = 20;
+        };
+
+        const handleMouseDown = () => { isMouseDown = true; setMode('ORBIT'); };
+        const handleMouseUp = () => { isMouseDown = false; setMode('HOVER'); };
+
+        window.addEventListener('mousemove', handleMouseMove);
+        window.addEventListener('mousedown', handleMouseDown);
+        window.addEventListener('mouseup', handleMouseUp);
+
+        // --- Animation Loop ---
+        const animate = () => {
+            requestRef.current = requestAnimationFrame(animate);
+            time += 0.01;
+
+            for (let i = 0; i < COUNT; i++) {
+                const p = particles[i];
+
+                // --- Behavior Logic ---
+                if (isMouseDown) {
+                    // 1. ORBIT MODE: Rotate around mouse
+                    p.angle += p.speed + 0.02; // Spin faster
+
+                    const orbitX = mouse.x + Math.cos(p.angle + time) * p.radius;
+                    const orbitY = mouse.y + Math.sin(p.angle + time) * p.radius;
+                    // Spiraling Z for depth
+                    const orbitZ = Math.sin(p.angle * 2 + time) * 10;
+
+                    target.set(orbitX, orbitY, orbitZ);
+
+                    // Strong pull to orbit positions
+                    p.acc.subVectors(target, p.pos).multiplyScalar(0.08);
+
+                } else {
+                    // 2. HOVER/FOLLOW MODE: Follow mouse with flocking feel
+
+                    // Add noise/wandering
+                    const noiseX = Math.sin(time + i * 0.1) * 5;
+                    const noiseY = Math.cos(time + i * 0.1) * 5;
+
+                    target.copy(mouse).add(p.offset).add(new THREE.Vector3(noiseX, noiseY, 0));
+
+                    // Gentle pull
+                    p.acc.subVectors(target, p.pos).multiplyScalar(0.008);
+                }
+
+                // Physics update
+                p.vel.add(p.acc);
+                p.vel.multiplyScalar(isMouseDown ? 0.90 : 0.94); // Drag
+                p.pos.add(p.vel);
+
+                // Update Matrix
+                dummy.position.copy(p.pos);
+
+                // Rotation: Look at velocity direction (dynamic) or mouse (focused)
+                // Blending lookAt target for smoother rotation
+                const lookPos = new THREE.Vector3().copy(p.pos).add(p.vel.clone().multiplyScalar(5));
+
+                // If moving very slowly, keep previous rotation to avoid jitter
+                if (p.vel.lengthSq() > 0.01) {
+                    dummy.lookAt(lookPos);
+                }
+
+                // Scale effect based on speed (stretch when fast)
+                const speedScale = 1 + Math.min(p.vel.length(), 2) * 0.5;
+                dummy.scale.set(1, 1, speedScale);
+
+                dummy.updateMatrix();
+                mesh.setMatrixAt(i, dummy.matrix);
+            }
+
+            mesh.instanceMatrix.needsUpdate = true;
+            renderer.render(scene, camera);
+        };
+
+        animate();
+
+        // --- Resize ---
+        const handleResize = () => {
+            if (!containerRef.current) return;
+            const newWidth = containerRef.current.clientWidth;
+            const newHeight = containerRef.current.clientHeight;
+
+            camera.aspect = newWidth / newHeight;
+            camera.updateProjectionMatrix();
+            renderer.setSize(newWidth, newHeight);
+        };
+
+        window.addEventListener('resize', handleResize);
+
+        return () => {
+            window.removeEventListener('mousemove', handleMouseMove);
+            window.removeEventListener('mousedown', handleMouseDown);
+            window.removeEventListener('mouseup', handleMouseUp);
+            window.removeEventListener('resize', handleResize);
+            cancelAnimationFrame(requestRef.current);
+            if (containerRef.current && renderer.domElement) {
+                containerRef.current.removeChild(renderer.domElement);
+            }
+            geometry.dispose();
+            material.dispose();
+            renderer.dispose();
+        };
+    }, []);
+
+    return (
+        <div className="effect-lab" ref={containerRef}>
+            <div className="effect-lab-overlay">
+                <h2>Sword Stream</h2>
+                <div className="active-mode">
+                    MODE: <span>{mode}</span>
+                </div>
+                <p>
+                    <strong>Move</strong> to Guide &nbsp;|&nbsp;
+                    <strong>Click & Hold</strong> to Orbit & Charge
+                </p>
+            </div>
+        </div>
+    );
+};
+
+export default EffectLab;

src/pages/stock/Stock.css

@@ -1,6 +1,8 @@
 .stock {
     display: grid;
     gap: 28px;
+    /* Prevent overflow on small screens */
+    width: 100%;
 }
 
 .stock-header {
@@ -536,8 +538,32 @@
 }
 
 @media (max-width: 768px) {
+    .stock {
+        gap: 20px;
+    }
+
     .stock-panel {
         padding: 16px;
+        gap: 12px;
+    }
+
+    .stock-filter-row {
+        gap: 12px;
+        grid-template-columns: 1fr;
+    }
+
+    .stock-header h1 {
+        font-size: 28px;
+    }
+
+    .stock-actions {
+        width: 100%;
+    }
+
+    .stock-actions .button {
+        flex: 1;
+        text-align: center;
+        justify-content: center;
     }
 
     .stock-card {
@@ -568,13 +594,19 @@
     }
 
     .stock-holdings__metric {
-        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
+        grid-template-columns: repeat(2, 1fr);
         align-items: center;
         justify-items: start;
+        gap: 8px 16px;
+    }
+
+    /* Make the last item span full width if it's odd */
+    .stock-holdings__metric>*:last-child:nth-child(odd) {
+        grid-column: 1 / -1;
     }
 
     .stock-holdings__metric span {
-        font-size: 12px;
+        font-size: 11px;
     }
 
     .stock-holdings__metric strong {

src/pages/stock/Stock.jsx

@@ -1,6 +1,7 @@
 import React, { useEffect, useMemo, useState } from 'react';
 import { Link } from 'react-router-dom';
 import { getStockIndices, getStockNews } from '../../api';
+import Loading from '../../components/Loading';
 import './Stock.css';
 
 const formatDate = (value) => {
@@ -206,7 +207,7 @@ const Stock = () => {
                     </div>
                     <div className="stock-panel__actions">
                         {indicesLoading ? (
-                            <span className="stock-chip">불러오는 중</span>
+                            <Loading type="spinner" message="" />
                         ) : null}
                         <button
                             className="button ghost small"
@@ -237,8 +238,7 @@ const Stock = () => {
                             return (
                                 <div
                                     key={item.name}
-                                    className={`stock-snapshot__card ${
-                                        highlighted.has(item.name)
+                                    className={`stock-snapshot__card ${highlighted.has(item.name)
                                         ? 'is-highlight'
                                         : ''
                                         }`}
@@ -246,8 +246,7 @@ const Stock = () => {
                                     <p>{item.name}</p>
                                     <strong>{item.value ?? '--'}</strong>
                                     <span
-                                        className={`stock-snapshot__change ${
-                                            direction === 'up'
+                                        className={`stock-snapshot__change ${direction === 'up'
                                             ? 'is-up'
                                             : direction === 'down'
                                                 ? 'is-down'
@@ -332,9 +331,7 @@ const Stock = () => {
                         </p>
                     </div>
                     <div className="stock-panel__actions">
-                        {loading ? (
-                            <span className="stock-chip">불러오는 중</span>
-                        ) : null}
+                        {loading && <span className="stock-chip">Updating...</span>}
                         <span className="stock-chip">
                             국내 {newsDomestic.length} / 해외{' '}
                             {newsOverseas.length}
@@ -342,8 +339,8 @@ const Stock = () => {
                     </div>
                 </div>
 
-                {loading ? (
-                    <p className="stock-empty">뉴스를 불러오는 중...</p>
+                {loading && combinedNews.length === 0 ? (
+                    <Loading type="skeleton" />
                 ) : newsError ? (
                     <p className="stock-empty">{newsError}</p>
                 ) : combinedNews.length === 0 ? (
@@ -353,8 +350,7 @@ const Stock = () => {
                         <div className="stock-tabs">
                             <button
                                 type="button"
-                                className={`stock-tab ${
-                                    newsCategory === 'domestic'
+                                className={`stock-tab ${newsCategory === 'domestic'
                                     ? 'is-active'
                                     : ''
                                     }`}
@@ -364,8 +360,7 @@ const Stock = () => {
                             </button>
                             <button
                                 type="button"
-                                className={`stock-tab ${
-                                    newsCategory === 'overseas'
+                                className={`stock-tab ${newsCategory === 'overseas'
                                     ? 'is-active'
                                     : ''
                                     }`}

src/routes.jsx

@@ -1,10 +1,12 @@
-import React from 'react';
-import Home from './pages/home/Home';
-import Blog from './pages/blog/Blog';
-import Lotto from './pages/lotto/Lotto';
-import Travel from './pages/travel/Travel';
-import Stock from './pages/stock/Stock';
-import StockTrade from './pages/stock/StockTrade';
+import React, { lazy } from 'react';
+
+const Home = lazy(() => import('./pages/home/Home'));
+const Blog = lazy(() => import('./pages/blog/Blog'));
+const Lotto = lazy(() => import('./pages/lotto/Lotto'));
+const Travel = lazy(() => import('./pages/travel/Travel'));
+const Stock = lazy(() => import('./pages/stock/Stock'));
+const StockTrade = lazy(() => import('./pages/stock/StockTrade'));
+const EffectLab = lazy(() => import('./pages/effect-lab/EffectLab'));
 
 export const navLinks = [
     {
@@ -37,6 +39,12 @@ export const navLinks = [
         path: '/travel',
         description: '여행에서 담은 색과 장면을 전시하는 갤러리',
     },
+    {
+        id: 'lab',
+        label: 'Lab',
+        path: '/lab',
+        description: '실험적인 UI/UX 효과를 테스트하는 공간',
+    },
 ];
 
 export const appRoutes = [
@@ -64,4 +72,8 @@ export const appRoutes = [
         path: 'travel',
         element: <Travel />,
     },
+    {
+        path: 'lab',
+        element: <EffectLab />,
+    },
 ];