body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;margin:0}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background-color:#f5f5f5;color:#333;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6}.container{margin:0 auto;max-width:1200px;padding:0 20px}.header{background:linear-gradient(135deg,#667eea,#764ba2);box-shadow:0 2px 10px #0000001a;color:#fff;padding:60px 0;text-align:center}.header h1{font-size:2.5rem;font-weight:700;margin-bottom:10px}.header p{font-size:1.2rem;opacity:.95}.statistics{background:#fff;border-bottom:1px solid #eee;padding:40px 0}.stats-grid{grid-gap:30px;display:grid;gap:30px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}.stat-item{padding:20px;text-align:center}.stat-number{color:#667eea;font-size:2.5rem;font-weight:700;margin-bottom:10px}.stat-label{color:#666;font-size:1rem;font-weight:500}.main-content{min-height:calc(100vh - 300px);padding:40px 0}.error-message{background:#fee;border:1px solid #fcc;border-radius:5px;color:#c33;font-weight:500;margin-bottom:30px;padding:15px 20px}.courses-section h2{color:#333;font-size:2rem;margin-bottom:30px}.loading{color:#666;font-size:1.1rem;padding:40px;text-align:center}.courses-grid{grid-gap:25px;display:grid;gap:25px;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));margin-bottom:40px}.course-card{background:#fff;border:2px solid #0000;border-radius:8px;box-shadow:0 2px 8px #0000001a;cursor:pointer;overflow:hidden;transition:all .3s ease}.course-card:hover{border-color:#667eea;box-shadow:0 5px 20px #00000026;transform:translateY(-5px)}.course-card.selected{background:#f9f9ff;border-color:#667eea}.course-header{border-bottom:2px solid #f0f0f0;padding:20px}.course-header h3{color:#333;font-size:1.3rem;margin-bottom:10px}.instructor-badge{background:#667eea;border-radius:20px;color:#fff;display:inline-block;font-size:.85rem;font-weight:500;padding:5px 12px}.course-description{color:#666;font-size:.95rem;padding:15px 20px}.course-footer{align-items:center;background:#f9f9f9;display:flex;justify-content:space-between;padding:15px 20px}.students{color:#667eea;font-weight:500}.btn-select{background:#667eea;border:none;border-radius:5px;color:#fff;cursor:pointer;font-weight:500;padding:8px 16px;transition:background .3s ease}.btn-select:hover{background:#764ba2}.course-detail{animation:slideIn .3s ease;background:#fff;border-radius:8px;box-shadow:0 5px 20px #0000001a;margin-bottom:40px;padding:30px}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.detail-card{position:relative}.btn-close{background:#f0f0f0;border:none;border-radius:50%;cursor:pointer;font-size:1.5rem;height:40px;position:absolute;right:10px;top:10px;transition:background .3s ease;width:40px}.btn-close:hover{background:#e0e0e0}.detail-card h2{color:#333;font-size:2rem;margin-bottom:15px}.detail-description{color:#666;font-size:1.1rem;margin-bottom:30px}.detail-info{grid-gap:25px;border-bottom:1px solid #eee;border-top:1px solid #eee;display:grid;gap:25px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));margin-bottom:30px;padding:20px 0}.info-group{background:#f9f9f9;border-radius:5px;padding:15px}.info-group label{color:#667eea;display:block;font-weight:600;margin-bottom:8px}.info-group p{color:#666;font-size:1rem}.price{color:#e74c3c;font-size:1.3rem;font-weight:700!important}.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:5px;color:#fff;cursor:pointer;font-size:1.1rem;font-weight:600;padding:15px 40px;transition:transform .3s ease,box-shadow .3s ease;width:100%}.btn-primary:hover{box-shadow:0 5px 20px #667eea66;transform:scale(1.02)}.footer{background:#333;border-top:1px solid #eee;color:#fff;margin-top:40px;padding:30px 0;text-align:center}.footer p{font-size:.95rem;margin:8px 0}@media (max-width:768px){.header h1{font-size:1.8rem}.header p{font-size:1rem}.courses-grid{grid-template-columns:1fr}.stats-grid{grid-template-columns:repeat(2,1fr)}.detail-info{grid-template-columns:1fr}}
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