*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:Roboto,sans-serif;line-height:1.5;-webkit-font-smoothing:antialiased;display:flex;flex-direction:column;min-height:100vh;color:#333;background-color:#f5f5f5}img,picture,video,canvas,svg{display:block;max-width:100%}input,button,textarea,select{font:inherit}p,h1,h2,h3,h4,h5,h6{overflow-wrap:break-word}p a{color:#3498db;text-decoration:none;font-weight:500;transition:color .2s ease;padding-bottom:1px;border-bottom:1px solid rgba(52,152,219,.3)}p a:hover{color:#2980b9;border-bottom-color:#2980b9}#root,#__next{isolation:isolate}main{flex:1;display:flex;justify-content:center;align-items:center}.main-nav{background-color:#fff;box-shadow:0 2px 4px #0000001a;padding:15px 0;position:fixed;width:100%;z-index:9999}.nav-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;padding:0 20px}.nav-logo{font-size:1.5rem;font-weight:700;color:#333;text-decoration:none}.nav-links{display:flex;align-items:center}.nav-links a,.nav-links button{color:#333;text-decoration:none;margin-left:20px;font-size:1rem;transition:color .3s ease}.nav-links a:hover,.nav-links button:hover,.nav-links a.current-page{color:#007bff}.btn-sign-in,.logout-form button{background-color:#007bff;color:#fff!important;padding:8px 16px;border-radius:4px;transition:background-color .3s ease;border:none;cursor:pointer}.btn-sign-in:hover,.logout-form button:hover{background-color:#0056b3}.purchase-button{background-color:#df4c49;color:#fff!important;padding:8px 16px;border-radius:4px;transition:background-color .3s ease;border:none;cursor:pointer}.purchase-button:hover{background-color:#9c1919}.logout-form{margin:0;padding:0}.hamburger{display:none;background:none;border:none;cursor:pointer;padding:0;z-index:10}.hamburger span{display:block;width:25px;height:3px;margin:5px 0;background:#333;border-radius:3px;transition:transform .5s cubic-bezier(.77,.2,.05,1),background .5s cubic-bezier(.77,.2,.05,1),opacity .55s ease}.hamburger.active span:first-child{transform:rotate(45deg) translate(5px,5px)}.hamburger.active span:nth-child(2){opacity:0}.hamburger.active span:last-child{transform:rotate(-45deg) translate(7px,-6px)}.language-switcher{position:relative;display:inline-block;margin-left:15px}.current-language{display:flex;align-items:center;padding:8px 12px;background-color:#f8f9fa;border:1px solid #dee2e6;border-radius:4px;cursor:pointer;transition:background-color .2s ease;white-space:nowrap}.current-language:hover{background-color:#e9ecef}.lang-code{font-size:12px;font-weight:600;text-transform:uppercase;color:#495057;margin-right:4px}.dropdown-arrow{font-size:10px;color:#6c757d;transition:transform .2s ease}.language-dropdown{position:absolute;top:calc(100% + 4px);right:0;background-color:#fff;border:1px solid #dee2e6;border-radius:4px;box-shadow:0 4px 6px #0000001a;min-width:120px;z-index:10000;opacity:0;visibility:hidden;transform:translateY(-10px);transition:all .2s ease;overflow:hidden}.language-dropdown.show{opacity:1;visibility:visible;transform:translateY(0)}.language-option{display:block;padding:10px 16px;text-decoration:none;color:#495057;transition:background-color .2s ease;white-space:nowrap;text-align:center;margin:0}.language-option:hover{background-color:#f8f9fa;color:#007bff}.language-option:first-child{border-radius:3px 3px 0 0}.language-option:last-child{border-radius:0 0 3px 3px}.language-option .lang-name{font-size:14px;display:block}a.language-option{margin:0}.login-container,.signup-container,.contact-container,.password-container,.profile-container{width:100%;max-width:500px;padding:40px;background-color:#fff;border-radius:8px;box-shadow:0 4px 6px #0000001a;margin:120px auto 60px}.form-group{margin-bottom:20px}input,textarea{width:100%;padding:12px;border:1px solid #e0e0e0;border-radius:4px;font-size:16px;background-color:#f8f9fa;transition:border-color .3s,box-shadow .3s}input:focus,textarea:focus{outline:none;border-color:#007bff;box-shadow:0 0 0 2px #007bff40}textarea{height:150px;resize:vertical}.btn{display:block;width:100%;padding:12px 24px;background-color:#007bff;color:#fff;border:none;border-radius:4px;font-size:14px;cursor:pointer;transition:background-color .3s;text-transform:uppercase;text-align:center;text-decoration:none}.btn:hover{background-color:#0056b3}.btn-secondary{display:inline-block;background-color:#6c757d;color:#fff;padding:10px 20px;border-radius:4px;text-decoration:none;transition:background-color .3s ease;text-align:center}.btn-secondary:hover{background-color:#5a6268}.checkbox-group{display:flex;align-items:flex-start;margin-bottom:20px}.checkbox-group input[type=checkbox]{width:auto;margin-right:10px;margin-top:4px}.checkbox-group label{font-size:14px;line-height:1.4;flex:1}.checkbox-group a{color:#007bff;text-decoration:none}.checkbox-group a:hover{text-decoration:underline}.account-info{margin-bottom:30px}.info-group{margin-bottom:15px}.info-group label{font-weight:700;display:block;margin-bottom:5px;color:#555}.info-group p{background-color:#f8f9fa;padding:10px;border-radius:4px;border:1px solid #e0e0e0}h1{font-size:1.5rem;margin-bottom:30px;color:#333}.accent{color:#007bff}.error{color:red;font-size:14px;margin-top:5px;display:block}.forgot-password-link,.register-link,.login-link{text-align:center;margin-top:20px}.forgot-password-link a,.register-link a,.login-link a{color:#007bff;text-decoration:none}.forgot-password-link a:hover,.register-link a:hover,.login-link a:hover{text-decoration:underline}footer{background-color:#333;color:#fff;padding:20px 0;text-align:center}footer a{color:#fff;text-decoration:none;margin:0 10px;font-size:.9rem}footer a:hover{text-decoration:underline}.loader-wrapper{position:fixed;top:0;left:0;width:100%;height:100%;background:#fffc;display:none;justify-content:center;align-items:center;z-index:9999;opacity:0;transition:opacity .3s ease-in-out}.loader{border:5px solid #f3f3f3;border-top:5px solid #3498db;border-radius:50%;width:50px;height:50px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.flash{position:fixed;top:100px;left:0;right:0;width:100%;max-width:600px;border-radius:8px;margin:0 auto;color:#fff;font-weight:500;background-color:#3498db;padding:15px 20px;text-align:center;z-index:1000;box-shadow:0 2px 4px #0000001a;animation:fadeInOut 5s ease-in-out}@keyframes fadeInOut{0%,to{opacity:0}10%,90%{opacity:1}}.policy-container,.authors-container{max-width:800px;padding:40px;background-color:#fff;border-radius:8px;box-shadow:0 4px 6px #0000001a;margin:120px auto 60px}.policy-container h1,.authors-container h1{font-size:1.5rem;color:#333;margin-bottom:30px}.policy-container .content,.authors-container .content{font-size:1rem;line-height:1.6;color:#444}.policy-container .content h2,.authors-container .content h2{font-size:1.3rem;margin-top:30px;margin-bottom:15px;color:#333}.policy-container .content p,.authors-container .content p{margin-bottom:15px}.policy-container .content ul,.policy-container .content ol,.authors-container .content ul,.authors-container .content ol{margin-bottom:15px;padding-left:20px}.policy-container .content li,.authors-container .content li{margin-bottom:5px}.home-container{width:100%;min-height:90vh;padding-top:90px}.banner{max-width:1200px;width:90%;height:auto;margin:0 auto 20px;overflow:hidden;background-color:#000;border-radius:8px}.banner-image{width:100%;height:100%;object-fit:cover}.home-content{max-width:1200px;width:90%;padding:40px;background-color:#fff;border-radius:8px;box-shadow:0 4px 6px #0000001a;margin:60px auto}.categories-content,.books-content,.topics-content{max-width:1200px;width:90%;padding:40px;background-color:#fff;border-radius:8px;box-shadow:0 4px 6px #0000001a;margin:120px auto 60px}.book-description,.topic-description{margin-bottom:20px;font-size:1.1rem;color:#666;line-height:1.6}.topic-line{height:3px;margin:8px 0;width:100%;display:block;border-radius:1px}.cards-wrapper{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card-container{position:relative}.card{background-color:#f9f9f9;border-radius:8px;box-shadow:0 1px 3px #0000001a;height:100%;padding:20px;display:flex;flex-direction:column;transition:all .3s ease;cursor:pointer;text-decoration:none}.card:hover{box-shadow:0 4px 6px #0000001a;transform:translateY(-2px)}.card-content{position:relative;z-index:2;transition:color .3s ease}.card-title{font-size:18px;font-weight:700;color:#333;margin-bottom:10px}.card-description{font-size:14px;color:#666}.category-view-container,.topics-view-container{max-width:1200px;width:90%;margin:120px auto 60px;background-color:#fff;border-radius:8px;box-shadow:0 4px 6px #0000001a;padding:40px}.category-header{background-color:#f8f9fa;border-radius:8px;padding:30px;margin-bottom:20px;text-align:center;box-shadow:0 2px 4px #0000000d}.category-header h1{color:#333;margin-bottom:15px}.category-header p{font-size:1.1rem;color:#666;line-height:1.6}.back-button{display:inline-block;margin-bottom:20px}.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.video-card{display:flex;flex-direction:column;background-color:#f9f9f9;border-radius:8px;overflow:hidden;box-shadow:0 2px 4px #0000001a;transition:transform .3s ease,box-shadow .3s ease;text-decoration:none;color:inherit;cursor:pointer}.video-card:hover{transform:translateY(-5px);box-shadow:0 4px 8px #00000026}.video-card a{text-decoration:none}.video-card a h3{color:#333}.video-card a p,.video-card a p a{color:#666}.video-poster{width:100%;height:0;padding-bottom:56.25%;position:relative;overflow:hidden}.video-poster img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;opacity:.5;transition:opacity .3s ease}.video-card:hover .video-poster img{opacity:1}.video-info{padding:15px;flex-grow:1;display:flex;flex-direction:column}.video-info h3{font-size:1rem;color:#333;margin-bottom:5px}.video-info div{font-size:.8rem;color:#666;margin-bottom:5px;flex-grow:1;display:-webkit-box;-webkit-line-clamp:5;line-clamp:5;-webkit-box-orient:vertical;overflow:hidden;text-overflow:ellipsis;max-height:6em}.no-videos{grid-column:1 / -1;text-align:center;color:#666;font-style:italic;padding:20px}.pagination{display:flex;justify-content:center;align-items:center;margin-top:20px}.pagination a,.pagination .current{display:inline-block;padding:8px 12px;margin:0 4px;border:1px solid #e1e4e8;border-radius:4px;text-decoration:none;color:#333;transition:all .3s ease}.pagination a:hover,.pagination .current{background-color:#4a90e2;color:#fff;border-color:#4a90e2}.video-container{max-width:900px;width:90%;margin:120px auto 60px;background-color:#fff;border-radius:8px;box-shadow:0 4px 6px #0000001a;padding:20px}.video-content{width:100%;margin:0 auto;padding:10px}.video-title{font-size:1.4rem;color:#333;margin-bottom:20px;text-align:left}.video-wrapper{width:100%;margin-bottom:30px;position:relative;padding-top:56.25%}.post-poster{width:100%;margin-bottom:30px;text-align:center}.post-poster img{max-width:100%;height:auto;border-radius:8px;box-shadow:0 2px 8px #0000001a}.video-js{position:absolute;top:0;left:0;width:100%;height:100%;border-radius:8px;overflow:hidden;background-color:transparent!important}.video-js .vjs-tech{background-color:#000}.video-js .vjs-control-bar{background-color:#2b333fb3;transition:all .3s ease}.video-js:hover .vjs-control-bar{background-color:#2b333fe6}.video-description{font-size:1rem;color:#444;line-height:1.6;margin-bottom:20px}.vjs-poster{background-size:cover;background-position:center center}.vjs-poster img{width:100%;height:100%;object-fit:cover}.youtube-embed-container{position:relative;width:100%;height:0;padding-bottom:56.25%;overflow:hidden;margin-bottom:20px;border-radius:8px}.youtube-embed-container iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0}.youtube-embed{position:relative;padding-top:0;padding-bottom:56.25%;height:0;overflow:hidden;width:100%;border-radius:8px;margin-bottom:20px}@media(max-width:1024px){.cards-wrapper{grid-template-columns:repeat(2,1fr)}.video-poster{padding-bottom:40%}.banner{height:400px}.banner-image{object-position:50% 20%}}@media(max-width:768px){.home-container{padding-top:80px}.hamburger{display:block}.nav-logo{max-width:80%}.nav-links{position:fixed;right:-100%;top:0;flex-direction:column;background-color:#fff;width:60%;height:100%;transition:.3s;box-shadow:-5px 0 15px #0003;padding:80px 0 20px 30px;overflow-y:auto}.nav-links.active{right:0;align-items:flex-start}.nav-links a,.nav-links button,.nav-links .logout-form{margin:10px 0;font-size:1.1rem}.nav-links .btn-sign-in{display:inline-block;margin-top:20px}.language-switcher{margin-left:0;margin-top:15px;width:auto;display:block}.current-language{display:inline-flex;padding:8px 12px}.language-dropdown{position:fixed;top:auto;right:auto;left:50%;transform:translate(-50%) translateY(-10px);width:auto;min-width:120px;max-width:150px;margin-top:10px}.language-dropdown.show{transform:translate(-50%) translateY(0)}.nav-links.active .language-switcher{margin-left:0;margin-right:auto}.nav-links.active .language-dropdown{position:absolute;left:0;right:auto;transform:translateY(-10px);width:auto;min-width:120px;max-width:150px}.nav-links.active .language-dropdown.show{transform:translateY(0)}.policy-container,.authors-container,.books-content,.categories-content,.topics-content,.login-container,.signup-container,.contact-container,.password-container,.profile-container{width:90%;padding:20px;margin:100px auto 30px}.policy-container h1,.authors-container h1{font-size:1.3rem;margin-bottom:20px}.policy-container .content,.authors-container .content{font-size:.9rem}.policy-container .content h2,.authors-container .content h2{font-size:1.1rem;margin-top:20px;margin-bottom:10px}.banner{height:250px}.banner-image{object-position:30% center}.cards-wrapper{grid-template-columns:1fr}.home-content{width:90%;padding:20px;margin:30px auto}.card-title{font-size:16px}.card-description{font-size:12px}.category-view-container{width:90%;padding:20px;margin:100px auto 30px}.category-header{padding:20px;margin-bottom:20px}.category-header p{font-size:1rem}.video-grid{grid-template-columns:1fr}.video-info h3{font-size:1rem}.video-info p{font-size:.8rem}.pagination{flex-wrap:wrap}.video-container{width:95%;padding:20px;margin:80px auto 40px}.video-content{width:100%}.video-title{font-size:1.3rem}.video-description{font-size:.9rem}}@media(max-width:480px){.banner{height:180px}.banner-image{object-position:35% center}.video-container{padding:15px;margin:60px auto 30px}.video-title{font-size:1.2rem}.video-description{font-size:.85rem}}