.header{background:var(--bg-darker);border-bottom:2px solid var(--neon-green);box-shadow:0 0 10px #00ff884d;padding:1rem 0;position:sticky;top:0;z-index:100}.header-content{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}.logo{font-size:1.5rem;font-weight:700;text-decoration:none}.nav{display:flex;gap:2rem;flex-wrap:wrap}.nav-link{color:var(--text-primary);text-decoration:none;padding:.5rem 1rem;border:1px solid transparent;transition:all .3s ease;position:relative}.nav-link:hover{color:var(--neon-green);border-color:var(--neon-green);box-shadow:0 0 5px #00ff8880}.language-toggle{padding:.5rem 1rem;background:transparent;border:2px solid var(--neon-blue);color:var(--neon-blue);cursor:pointer;transition:all .3s ease;font-weight:700}.language-toggle:hover{background:var(--neon-blue);color:var(--bg-dark);box-shadow:0 0 10px var(--neon-blue)}@media (max-width: 768px){.header-content{flex-direction:column}.nav{gap:1rem}}.footer{background:var(--bg-darker);border-top:2px solid var(--neon-blue);padding:2rem 0;margin-top:auto;text-align:center;box-shadow:0 -5px 10px #00d4ff33}.footer p{color:var(--text-secondary);font-size:.9rem}.home{min-height:80vh}.hero{text-align:center;padding:4rem 0;margin-bottom:4rem}.hero-title{font-size:3.5rem;margin-bottom:1rem;font-weight:700}.hero-subtitle{font-size:2rem;margin-bottom:2rem;font-weight:300}.hero-description{font-size:1.2rem;color:var(--text-secondary);max-width:800px;margin:0 auto 3rem;line-height:1.8}.hero-cta{display:flex;gap:1.5rem;justify-content:center;flex-wrap:wrap}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2rem;margin-top:4rem}.feature-card{background:var(--bg-darker);padding:2rem;border:2px solid transparent;border-radius:8px;transition:all .3s ease;text-align:center}.feature-card:hover{border-color:var(--neon-green);box-shadow:0 0 15px #00ff884d,inset 0 0 15px #00ff881a;transform:translateY(-5px)}.feature-icon{font-size:3rem;margin-bottom:1rem}.feature-card h3{color:var(--neon-green);margin-bottom:1rem;font-size:1.5rem}.feature-card p{color:var(--text-secondary);line-height:1.6}@media (max-width: 768px){.hero-title{font-size:2.5rem}.hero-subtitle{font-size:1.5rem}.hero-description{font-size:1rem}.hero-cta{flex-direction:column;align-items:center}.features{grid-template-columns:1fr}}.courses{min-height:80vh;padding:2rem 0}.page-header{text-align:center;margin-bottom:4rem}.page-title{font-size:3rem;margin-bottom:1rem;font-weight:700}.page-subtitle{font-size:2rem;margin-bottom:1.5rem;font-weight:300}.page-intro{font-size:1.1rem;color:var(--text-secondary);max-width:700px;margin:0 auto;line-height:1.8}.courses-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin-top:3rem}.course-card{background:var(--bg-darker);padding:2.5rem;border-radius:8px;position:relative;overflow:hidden;transition:all .3s ease}.course-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--neon-green);transform:scaleX(0);transition:transform .3s ease}.course-card-green:before{background:var(--neon-green)}.course-card-blue:before{background:var(--neon-blue)}.course-card:hover:before{transform:scaleX(1)}.course-card:hover{transform:translateY(-10px);box-shadow:0 10px 30px #00000080,0 0 20px #0f83}.course-card-green:hover{box-shadow:0 10px 30px #00000080,0 0 20px #00ff884d;border:2px solid var(--neon-green)}.course-card-blue:hover{box-shadow:0 10px 30px #00000080,0 0 20px #00d4ff4d;border:2px solid var(--neon-blue)}.course-number{font-size:4rem;font-weight:700;opacity:.1;position:absolute;top:1rem;right:1rem;color:var(--neon-green)}.course-card-blue .course-number{color:var(--neon-blue)}.course-title{font-size:1.8rem;margin-bottom:1rem;color:var(--neon-green);position:relative;z-index:1}.course-card-blue .course-title{color:var(--neon-blue)}.course-description{color:var(--text-secondary);line-height:1.8;margin-bottom:2rem;position:relative;z-index:1}.course-btn{position:relative;z-index:1}@media (max-width: 768px){.page-title{font-size:2rem}.page-subtitle{font-size:1.5rem}.courses-grid{grid-template-columns:1fr}}.econometric-thinking{min-height:80vh;padding:2rem 0}.thinking-structure{display:flex;flex-direction:column;gap:2rem;margin:3rem 0}.structure-section{display:flex;gap:2rem;padding:2rem;background:var(--bg-darker);border-radius:8px;border-left:4px solid var(--neon-green);transition:all .3s ease;position:relative}.structure-blue{border-left-color:var(--neon-blue)}.structure-section:hover{transform:translate(10px);box-shadow:0 5px 20px #0000004d,0 0 15px #0f83}.structure-blue:hover{box-shadow:0 5px 20px #0000004d,0 0 15px #00d4ff33}.section-number{font-size:3rem;font-weight:700;color:var(--neon-green);opacity:.5;min-width:80px;display:flex;align-items:center;justify-content:center}.structure-blue .section-number{color:var(--neon-blue)}.section-content{flex:1}.section-title{font-size:1.8rem;margin-bottom:1rem;color:var(--neon-green)}.structure-blue .section-title{color:var(--neon-blue)}.section-text{color:var(--text-secondary);line-height:1.8;font-size:1.1rem}.thinking-visualization{margin-top:4rem;padding:3rem 0;border-top:2px solid var(--bg-darker)}.visualization-container{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:1rem;padding:2rem}.visual-node{padding:1.5rem 2.5rem;border-radius:8px;font-weight:700;font-size:1.2rem;min-width:120px;text-align:center;transition:all .3s ease}.node-green{background:#00ff881a;border:2px solid var(--neon-green);color:var(--neon-green);box-shadow:0 0 10px #00ff884d}.node-blue{background:#00d4ff1a;border:2px solid var(--neon-blue);color:var(--neon-blue);box-shadow:0 0 10px #00d4ff4d}.visual-node:hover{transform:scale(1.1);box-shadow:0 0 20px}.node-green:hover{box-shadow:0 0 20px var(--neon-green)}.node-blue:hover{box-shadow:0 0 20px var(--neon-blue)}.visual-arrow{font-size:2rem;color:var(--text-secondary);font-weight:700}@media (max-width: 768px){.structure-section{flex-direction:column;gap:1rem}.section-number{min-width:auto;font-size:2rem}.visualization-container{flex-direction:column}.visual-arrow{transform:rotate(90deg)}.visual-node{width:100%;max-width:200px}}.app{min-height:100vh;display:flex;flex-direction:column;background:var(--bg-dark)}.main-content{flex:1;padding:2rem 0}.neon-text-green{color:var(--neon-green);text-shadow:0 0 5px var(--neon-green),0 0 10px var(--neon-green),0 0 15px var(--neon-green)}.neon-text-blue{color:var(--neon-blue);text-shadow:0 0 5px var(--neon-blue),0 0 10px var(--neon-blue),0 0 15px var(--neon-blue)}.neon-border{border:2px solid var(--neon-green);box-shadow:0 0 5px var(--neon-green),inset 0 0 5px var(--neon-green)}.container{max-width:1200px;margin:0 auto;padding:0 2rem}.btn{padding:.75rem 1.5rem;border:2px solid var(--neon-green);background:transparent;color:var(--neon-green);font-size:1rem;cursor:pointer;transition:all .3s ease;text-transform:uppercase;letter-spacing:1px}.btn:hover{background:var(--neon-green);color:var(--bg-dark);box-shadow:0 0 10px var(--neon-green),0 0 20px var(--neon-green)}.btn-blue{border-color:var(--neon-blue);color:var(--neon-blue)}.btn-blue:hover{background:var(--neon-blue);color:var(--bg-dark);box-shadow:0 0 10px var(--neon-blue),0 0 20px var(--neon-blue)}@media (max-width: 768px){.container{padding:0 1rem}.main-content{padding:1rem 0}}*{margin:0;padding:0;box-sizing:border-box}:root{--bg-dark: #0a0a0f;--bg-darker: #050508;--neon-green: #00ff88;--neon-blue: #00d4ff;--text-primary: #e0e0e0;--text-secondary: #a0a0a0;--accent-green: #00ff88;--accent-blue: #00d4ff}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--bg-dark);color:var(--text-primary);line-height:1.6}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}a{color:var(--neon-green);text-decoration:none;transition:color .3s ease}a:hover{color:var(--neon-blue)}