.app-container{min-height:100vh;display:flex;flex-direction:column}.content-container{display:flex;flex:1;margin-top:var(--header-height)}.main-content{flex:1;padding:24px;padding-left:calc(var(--sidebar-width) + 24px);transition:padding-left .3s;background-color:var(--light-gray);min-height:calc(100vh - var(--header-height))}.main-content.sidebar-collapsed{padding-left:calc(var(--sidebar-collapsed-width) + 24px)}.videos-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;padding-bottom:40px}.video-player-container{position:relative;padding-top:56.25%;background-color:var(--dark);border-radius:12px;overflow:hidden;margin-bottom:16px}.video-info{margin-bottom:16px}.video-title{font-size:20px;font-weight:500;margin-bottom:8px;line-height:1.4}.video-stats-actions{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding-bottom:16px;border-bottom:1px solid var(--light-gray)}.video-views{color:var(--text-secondary);font-size:14px}.video-actions{display:flex;flex-wrap:wrap;gap:8px}.video-action-btn{display:flex;align-items:center;gap:6px;padding:8px 12px;border-radius:18px;background-color:var(--light-gray);font-size:14px;font-weight:500;transition:background-color .2s}.save-btn.active svg{fill:var(--primary, red)}.video-action-btn:hover{background-color:#e0e0e0}.video-action-btn svg{fill:var(--text-secondary)}.channel-info{margin-top:16px;padding-bottom:16px;border-bottom:1px solid var(--light-gray)}.channel-header{display:flex;align-items:flex-start;margin-bottom:12px;gap:16px}.channel-avatar{width:48px;height:48px;border-radius:50%;flex-shrink:0}.channel-details{flex:1;min-width:0}.channel-name{font-weight:500;margin-bottom:2px}.subscribe-btn{background-color:var(--dark);color:#fff;padding:10px 16px;border-radius:18px;font-weight:500;text-transform:capitalize;margin-left:auto;height:fit-content;transition:background-color .2s}.subscribe-btn:hover{background-color:var(--dark-light)}.subscribe-btn.subscribed{background-color:var(--light-gray);color:var(--text-secondary)}.subscribe-btn.subscribed:hover{background-color:#e0e0e0}.subscription-error-message{color:var(--primary, red);font-size:13px;margin-left:10px}.video-description{font-size:14px;line-height:1.6;color:var(--text);white-space:pre-wrap;background-color:var(--light-gray);padding:12px;border-radius:8px;margin-top:12px}.related-video-card{display:flex;gap:8px}.related-video-card .thumbnail-container{width:168px;padding-top:94px;flex-shrink:0;border-radius:8px}.related-video-card .video-info{padding-top:0;gap:8px}.related-video-card .channel-avatar{display:none}.related-video-card .video-title{font-size:13px;-webkit-line-clamp:2}.related-video-card .channel-name,.related-video-card .video-stats{font-size:12px}.auth-container{max-width:400px;margin:60px auto;padding:30px;background-color:var(--white);border-radius:8px;box-shadow:var(--shadow)}.auth-title{text-align:center;margin-bottom:24px;font-size:24px;font-weight:500}.auth-form{display:flex;flex-direction:column;gap:20px}.form-group{display:flex;flex-direction:column;gap:6px}.form-label{font-size:14px;font-weight:500;color:var(--text-secondary)}.form-input{padding:12px;border:1px solid #ccc;border-radius:4px;font-size:16px;transition:border-color .2s,box-shadow .2s}.form-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px #f003}.btn-primary{background-color:var(--primary);color:var(--white);padding:12px;border-radius:18px;font-weight:500;font-size:16px;text-align:center;transition:background-color .2s;margin-top:8px}.btn-primary:hover{background-color:var(--primary-light)}.auth-switch{text-align:center;margin-top:20px;font-size:14px;color:var(--text-secondary)}.auth-switch a{color:var(--primary);font-weight:500}.not-found{display:flex;flex-direction:column;align-items:center;justify-content:center;height:calc(100vh - var(--header-height) - 48px);text-align:center;padding:0 20px}.not-found h1{font-size:100px;color:var(--primary);margin-bottom:16px}.not-found p{font-size:20px;color:var(--text-secondary);margin-bottom:32px}.not-found .btn-primary{display:inline-block;min-width:150px}@media (max-width: 1200px){.videos-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}.video-detail-container{grid-template-columns:minmax(0,1fr)}.related-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}.related-video-card{flex-direction:column}.related-video-card .thumbnail-container{width:100%;padding-top:56.25%}.related-video-card .video-info{padding-top:8px}}@media (max-width: 768px){.main-content{padding:16px;padding-left:calc(var(--sidebar-collapsed-width) + 16px)}.main-content.sidebar-collapsed,.main-content.sidebar-open-mobile{padding-left:calc(var(--sidebar-collapsed-width) + 16px)}.videos-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}.video-stats-actions{flex-direction:column;align-items:flex-start}.channel-header{align-items:center}.subscribe-btn{margin-left:0;margin-top:8px}.auth-container{width:90%;margin:40px auto}}@media (max-width: 576px){.main-content,.main-content.sidebar-collapsed,.main-content.sidebar-open-mobile{padding:12px}.videos-grid{grid-template-columns:1fr;gap:20px}.video-title{font-size:18px}.video-action-btn{padding:6px 10px;font-size:13px}.not-found h1{font-size:80px}.not-found p{font-size:18px}}.video-detail-container{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:24px;padding-bottom:40px;max-width:1600px;margin:0 auto}.video-content-column,.related-videos-column{min-width:0}.video-player-container{position:relative;width:100%;padding-top:56.25%;background-color:var(--dark);border-radius:12px;overflow:hidden;margin-bottom:16px}.video-player{position:absolute;top:0;left:0;width:100%;height:100%;border-radius:12px}.video-player-error{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;justify-content:center;align-items:center;background-color:var(--light-gray);color:var(--text-secondary);font-size:14px;border-radius:12px}.channel-description-box{background-color:var(--light-gray);border-radius:12px;padding:16px;margin-top:16px}.channel-header{display:flex;align-items:flex-start;gap:16px;margin-bottom:12px}.channel-avatar-link{display:block;flex-shrink:0}.channel-avatar{width:48px;height:48px;border-radius:50%;object-fit:cover}.channel-details{flex-grow:1;min-width:0}.channel-name-link{text-decoration:none;color:var(--text);font-weight:500;display:inline-block;margin-bottom:2px}.channel-subscribers{color:var(--text-secondary);font-size:13px}.video-description{margin-top:12px;font-size:14px;line-height:1.6;white-space:pre-wrap;color:var(--text)}.description-toggle-btn{background:none;border:none;color:var(--text-secondary);font-weight:500;cursor:pointer;padding:4px 0;margin-top:8px;display:block;text-align:left}.description-toggle-btn:hover{color:var(--text)}.related-title{font-size:16px;font-weight:500;margin-bottom:16px}.related-list{display:flex;flex-direction:column;gap:12px}@media (max-width: 1024px){.video-detail-container{grid-template-columns:1fr}.related-videos-column{margin-top:24px}.related-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}.related-list .related-video-card{flex-direction:column}.related-list .related-video-card .thumbnail-container{width:100%;padding-top:56.25%}.related-list .related-video-card .video-info{padding-top:8px}}@media (max-width: 768px){.video-detail-container{gap:16px}.related-list{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}}@media (max-width: 576px){.video-detail-container{padding-bottom:24px}.related-list{grid-template-columns:1fr;gap:16px}.video-title{font-size:18px}.channel-header{align-items:center}.channel-avatar{width:40px;height:40px}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--primary: #ff0000;--primary-light: #ff6666;--dark: #0f0f0f;--dark-light: #272727;--gray: #aaaaaa;--light-gray: #f0f0f0;--white: #ffffff;--text: #030303;--text-secondary: #606060;--shadow: 0 1px 3px rgba(0, 0, 0, .1);--header-height: 56px;--sidebar-width: 240px;--sidebar-collapsed-width: 72px}body{font-family:Roboto,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;line-height:1.6;background-color:var(--white);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{text-decoration:none;color:inherit}button{background:none;border:none;cursor:pointer;font-family:inherit;font-size:inherit}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background-color:var(--gray);border-radius:20px}.loading-container{display:flex;flex-direction:column;justify-content:center;align-items:center;min-height:calc(100vh - var(--header-height) - 48px);text-align:center;color:var(--text-secondary)}.loading-spinner{width:40px;height:40px;border:4px solid var(--light-gray);border-top:4px solid var(--primary);border-radius:50%;animation:spin 1s linear infinite;margin-bottom:16px}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.error-container{padding:40px 20px;text-align:center;color:var(--primary);background-color:#fff0f0;border:1px solid var(--primary-light);border-radius:8px;margin:20px}.error-container h2{margin-bottom:10px}.error-container p{color:var(--text-secondary);margin-bottom:20px}