:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;line-height:1.5;font-weight:400;color-scheme:dark;color:#ffffffde;background-color:#1a1a2e;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);color:#fff}#root{min-height:100vh}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}h1,h2,h3,h4,h5,h6{margin:0;font-weight:600}p{margin:0}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;cursor:pointer;transition:all .25s ease}button:focus,button:focus-visible{outline:2px solid #646cff;outline-offset:2px}input{font-family:inherit}img{max-width:100%;height:auto}.app{min-height:100vh;background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);color:#fff}.header{padding:1rem 0;background:#0003;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.1)}.header-content{max-width:1200px;margin:0 auto;padding:0 2rem;display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:.5rem;font-size:1.5rem;font-weight:700}.logo-icon{font-size:2rem}.logo-text{color:#fff}.search-container{flex:1;max-width:400px;margin-left:2rem}.search-input{width:100%;padding:.75rem 1rem;border:none;border-radius:8px;background:#ffffff1a;color:#fff;font-size:1rem;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2)}.search-input::placeholder{color:#fff9}.search-input:focus{outline:none;border-color:#646cff;box-shadow:0 0 0 2px #646cff33}.categories{max-width:1200px;margin:0 auto;padding:2rem;display:flex;gap:1rem;flex-wrap:wrap}.category-btn{padding:.5rem 1.5rem;border:none;border-radius:20px;background:#ffffff1a;color:#fffc;font-size:.9rem;cursor:pointer;transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.1)}.category-btn:hover{background:#fff3;color:#fff}.category-btn.active{background:#646cff;color:#fff;border-color:#646cff}.main-content{max-width:1200px;margin:0 auto;padding:0 2rem 2rem}.loading,.error{text-align:center;padding:2rem;font-size:1.1rem}.error{color:#ff6b6b}.courses-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2rem}.course-card{background:#ffffff0d;border-radius:12px;overflow:hidden;cursor:pointer;transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.1)}.course-card:hover{transform:translateY(-4px);box-shadow:0 8px 32px #0000004d;background:#ffffff1a}.course-image-container{position:relative;height:200px;overflow:hidden}.course-image{width:100%;height:100%;object-fit:cover}.course-category{position:absolute;top:1rem;left:1rem;padding:.25rem .75rem;background:#000000b3;color:#fff;border-radius:12px;font-size:.8rem;text-transform:capitalize;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.course-info{padding:1.5rem}.course-title{font-size:1.1rem;font-weight:600;margin:0 0 .5rem;color:#fff;line-height:1.3}.course-author{color:#ffffffb3;font-size:.9rem;margin:0}.course-detail{min-height:100vh;background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460)}.back-button{position:fixed;top:2rem;left:2rem;width:50px;height:50px;border:none;border-radius:50%;background:#ffffff1a;color:#fff;font-size:1.5rem;cursor:pointer;transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);z-index:100}.back-button:hover{background:#fff3;transform:scale(1.1)}.course-hero{position:relative;height:60vh;overflow:hidden}.course-hero-image{width:100%;height:100%;object-fit:cover}.course-hero-overlay{position:absolute;inset:0;background:linear-gradient(to bottom,#0000004d,#000000b3);display:flex;justify-content:space-between;align-items:flex-start;padding:2rem}.course-category-badge{padding:.5rem 1rem;background:#000000b3;color:#fff;border-radius:16px;font-size:.9rem;text-transform:capitalize;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.bookmark-icon{font-size:1.5rem;cursor:pointer;transition:transform .3s ease}.bookmark-icon:hover{transform:scale(1.2)}.course-detail-content{max-width:800px;margin:0 auto;padding:3rem 2rem}.course-detail-title{font-size:2.5rem;font-weight:700;margin:0 0 1rem;color:#fff;line-height:1.2}.course-rating{color:#fffc;font-size:1rem;margin-bottom:3rem}.course-section{margin-bottom:3rem}.course-section h2{font-size:1.5rem;font-weight:600;margin:0 0 1rem;color:#fff}.course-section p{color:#fffc;line-height:1.6;font-size:1rem}.course-author{display:flex;gap:1.5rem;margin-bottom:3rem;padding:2rem;background:#ffffff0d;border-radius:12px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.1)}.author-avatar{width:80px;height:80px;border-radius:50%;object-fit:cover;flex-shrink:0}.author-info h3{font-size:1.2rem;font-weight:600;margin:0 0 .5rem;color:#fff}.author-profession{color:#646cff;font-size:.9rem;margin:0 0 1rem}.author-bio{color:#fffc;line-height:1.5;font-size:.9rem;margin:0}.unlock-course-btn{width:100%;padding:1rem 2rem;background:linear-gradient(135deg,gold,#ffed4e);color:#000;border:none;border-radius:8px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .3s ease}.unlock-course-btn:hover{transform:translateY(-2px);box-shadow:0 8px 32px #ffd7004d}@media (max-width: 768px){.header-content{flex-direction:column;gap:1rem}.search-container{margin-left:0;max-width:none}.categories{padding:1rem}.courses-grid{grid-template-columns:1fr;gap:1rem}.course-detail-title{font-size:2rem}.course-author{flex-direction:column;text-align:center}.back-button{top:1rem;left:1rem}}