*{box-sizing:border-box}body{margin:0;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:#f8f9fa;color:#212529;line-height:1.6}.app{min-height:100vh;display:flex;flex-direction:column}.navbar{background:#fff;box-shadow:0 2px 4px #0000001a;padding:0 1rem;position:sticky;top:0;z-index:100;display:flex;justify-content:space-between;align-items:center}.navbar-brand{font-size:1.5rem;font-weight:700}.brand-link{color:#007bff;text-decoration:none}.navbar-nav{display:flex;gap:1rem;align-items:center}.nav-link{color:#6c757d;text-decoration:none;padding:.5rem 1rem;border-radius:.25rem;transition:background-color .2s}.nav-link:hover{background-color:#f8f9fa;color:#007bff}.logout-btn{background:none;border:none;color:#6c757d;cursor:pointer;padding:.5rem 1rem;border-radius:.25rem;transition:background-color .2s}.logout-btn:hover{background-color:#f8f9fa;color:#dc3545}.main-content{flex:1;padding:2rem 1rem;max-width:1200px;margin:0 auto;width:100%}.loading{text-align:center;padding:2rem;font-size:1.2rem;color:#6c757d}.btn{display:inline-block;padding:.5rem 1rem;border:none;border-radius:.25rem;text-decoration:none;font-weight:500;cursor:pointer;transition:all .2s;text-align:center}.btn-primary{background-color:#007bff;color:#fff}.btn-primary:hover{background-color:#0056b3}.btn-lg{padding:.75rem 1.5rem;font-size:1.1rem}.landing-page{text-align:center}.hero{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:4rem 2rem;border-radius:.5rem;margin-bottom:3rem}.hero h1{font-size:2.5rem;margin-bottom:1rem;font-weight:700}.hero-subtitle{font-size:1.2rem;margin-bottom:2rem;opacity:.9}.featured-section{margin-top:3rem}.featured-section h2{font-size:2rem;margin-bottom:2rem;color:#343a40}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2rem;margin-top:2rem;justify-items:center}.course-card{display:block;background:#fff;border-radius:.5rem;box-shadow:0 2px 8px #0000001a;overflow:hidden;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s}.course-card:hover{transform:translateY(-2px);box-shadow:0 4px 16px #00000026}.course-card img{width:100%;height:200px;object-fit:cover}.course-card-body{padding:1.5rem}.course-card h3{margin:0 0 .5rem;font-size:1.25rem;color:#343a40}.course-description{color:#6c757d;margin-bottom:1rem;line-height:1.5}.course-card-footer{display:flex;justify-content:space-between;align-items:center}.course-category{background:#e9ecef;color:#495057;padding:.25rem .5rem;border-radius:.25rem;font-size:.875rem;font-weight:500}.course-price{font-weight:700;color:#007bff;font-size:1.1rem}.catalog-page{max-width:1200px;margin:0 auto}.catalog-page h1{text-align:center;margin-bottom:2rem;color:#343a40}.catalog-filters{display:flex;gap:1rem;margin-bottom:2rem;flex-wrap:wrap}.search-input,.category-select{padding:.5rem;border:1px solid #ced4da;border-radius:.25rem;font-size:1rem}.search-input{flex:1;min-width:200px}.category-select{min-width:150px}.course-detail{max-width:800px;margin:0 auto}.course-detail img{width:100%;height:300px;object-fit:cover;border-radius:.5rem;margin-bottom:2rem}.course-detail h1{font-size:2.5rem;margin-bottom:1rem;color:#343a40}.course-detail .course-price{font-size:1.5rem;color:#007bff;margin-bottom:1rem}.course-detail .course-description{font-size:1.1rem;line-height:1.6;margin-bottom:2rem}.video-list{margin-top:2rem}.video-item{display:flex;align-items:center;padding:1rem;border:1px solid #e9ecef;border-radius:.25rem;margin-bottom:.5rem;background:#fff}.video-item:hover{background:#f8f9fa}.video-number{background:#007bff;color:#fff;width:2rem;height:2rem;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;margin-right:1rem}.account-page{max-width:600px;margin:0 auto}.account-section{background:#fff;padding:2rem;border-radius:.5rem;box-shadow:0 2px 8px #0000001a;margin-bottom:2rem}.account-section h2{margin-bottom:1.5rem;color:#343a40}.profile-info{display:flex;flex-direction:column;gap:1rem}.profile-field{display:flex;justify-content:space-between;align-items:center;padding:.5rem 0;border-bottom:1px solid #e9ecef}.profile-field label{font-weight:500;color:#495057}.profile-field span{color:#6c757d}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500;color:#495057}.form-group input,.form-group select{width:100%;padding:.5rem;border:1px solid #ced4da;border-radius:.25rem;font-size:1rem}.form-group input:focus,.form-group select:focus{outline:none;border-color:#007bff;box-shadow:0 0 0 .2rem #007bff40}.announcements-list{max-width:800px;margin:0 auto}.announcement-item{background:#fff;padding:2rem;border-radius:.5rem;box-shadow:0 2px 8px #0000001a;margin-bottom:2rem}.announcement-item h3{margin:0 0 1rem;color:#343a40}.announcement-date{color:#6c757d;font-size:.875rem;margin-bottom:1rem}.catalog-cta-card{max-width:400px;margin:0 auto}.catalog-cta-body{display:flex;flex-direction:column;align-items:center;text-align:center;gap:.75rem;padding:2rem}.catalog-cta-body h3{font-size:1.5rem;margin:0}.player-page{display:flex;gap:1.5rem;align-items:flex-start}.player-sidebar{width:280px;flex-shrink:0;background:#fff;border-radius:.5rem;box-shadow:0 2px 8px #0000001a;padding:1rem;max-height:calc(100vh - 120px);overflow-y:auto}.player-sidebar h2{font-size:1rem;margin:0 0 1rem;color:#343a40}.player-sidebar .video-list{list-style:none;padding:0;margin:0}.player-sidebar .video-item{display:block;padding:.6rem .75rem;border-radius:.25rem;cursor:pointer;color:#495057;margin-bottom:.25rem;border:1px solid transparent;font-size:.9rem}.player-sidebar .video-item:hover{background:#f8f9fa}.player-sidebar .video-item.active{background:#e7f1ff;border-color:#b8d4fe;color:#007bff;font-weight:500}.player-main{flex:1;min-width:0}.player-main>h2{margin:0 0 1rem;font-size:1.25rem;color:#343a40}.video-container{position:relative;width:100%;background:#000;border-radius:.5rem;overflow:hidden}.video-overlay{position:absolute;inset:0;z-index:1;pointer-events:none}.video-player{display:block;width:100%;max-height:70vh}.course-owned-badge{font-weight:700;color:#28a745;font-size:.95rem}.access-expiry{margin-top:.5rem;font-size:.875rem;color:#6c757d}.auth-form{max-width:400px;margin:2rem auto;background:#fff;padding:2rem;border-radius:.5rem;box-shadow:0 2px 8px #0000001a}.auth-form h1{text-align:center;margin-bottom:2rem;color:#343a40}.auth-form .btn{width:100%;margin-top:1rem}.auth-links{text-align:center;margin-top:1rem}.auth-links a{color:#007bff;text-decoration:none}.auth-links a:hover{text-decoration:underline}@media(max-width:768px){.navbar-nav{flex-direction:column;gap:.5rem}.catalog-filters{flex-direction:column}.course-grid{grid-template-columns:1fr}.course-card-footer{flex-direction:column;gap:.5rem;align-items:flex-start}.hero h1{font-size:2rem}.main-content{padding:1rem}}