.tutorial-page{background-color:#050505;color:#fff;padding-top:80px}.tutorial-page .nav{background:#050505cc!important;backdrop-filter:blur(20px)!important;-webkit-backdrop-filter:blur(20px)!important;border-bottom:1px solid rgba(255,255,255,.05)}.tutorial-page .nav-links a{color:#e0e0e0}.tutorial-page .logo{color:#fff}.tutorial-container{display:grid;grid-template-columns:350px 1fr;gap:30px;max-width:1600px;margin:0 auto;padding:40px;min-height:calc(100vh - 80px)}.tutorial-sidebar{background:#ffffff08;border:1px solid rgba(255,255,255,.08);border-radius:24px;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);display:flex;flex-direction:column;height:calc(100vh - 160px);position:sticky;top:120px;overflow:hidden;box-shadow:0 20px 40px #00000080}.sidebar-header{padding:30px;border-bottom:1px solid rgba(255,255,255,.05)}.sidebar-header h2{font-size:1.5rem;font-weight:600;margin-bottom:8px;background:linear-gradient(135deg,#fff,#888);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.sidebar-header p{font-size:.9rem;color:#888;margin-bottom:20px}.device-selector{position:relative;width:100%;z-index:20}.selector-current{background:#ffffff0d;border:1px solid rgba(255,255,255,.1);padding:14px 20px;border-radius:12px;display:flex;justify-content:space-between;align-items:center;cursor:pointer;transition:all .3s ease;font-weight:500;color:#fff;font-size:1rem}.selector-current:hover,.device-selector.open .selector-current{background:#409cff1a;border-color:#409cff80;box-shadow:0 0 20px #409cff26}.chevron{width:20px;height:20px;transition:transform .3s cubic-bezier(.4,0,.2,1)}.device-selector.open .chevron{transform:rotate(180deg)}.selector-options{position:absolute;top:calc(100% + 10px);left:0;right:0;background:#141414f2;backdrop-filter:blur(25px);-webkit-backdrop-filter:blur(25px);border:1px solid rgba(255,255,255,.1);border-radius:12px;overflow:hidden;opacity:0;visibility:hidden;transform:translateY(-10px);transition:all .3s cubic-bezier(.4,0,.2,1);box-shadow:0 15px 40px #000c}.device-selector.open .selector-options{opacity:1;visibility:visible;transform:translateY(0)}.device-option{padding:14px 20px;color:#a0a0a0;cursor:pointer;transition:all .2s ease;font-size:.95rem;position:relative}.device-option:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:#409cff;transform:scaleY(0);transition:transform .2s ease}.device-option.active:before{transform:scaleY(1)}.device-option:hover{background:#ffffff0d;color:#fff;padding-left:25px}.device-option.active{color:#fff;background:#409cff1a}.playlist{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:12px}.playlist::-webkit-scrollbar{width:6px}.playlist::-webkit-scrollbar-track{background:#ffffff05}.playlist::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:10px}.playlist::-webkit-scrollbar-thumb:hover{background:#fff3}.playlist-item{display:flex;align-items:center;gap:15px;padding:16px;border-radius:16px;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);border:1px solid transparent;background:#ffffff05}.playlist-item:hover{background:#ffffff0f;border-color:#ffffff1a;transform:translate(5px)}.playlist-item.active{background:#409cff1a;border-color:#409cff4d;box-shadow:inset 0 0 20px #409cff0d}.item-number{font-size:.85rem;color:#666;font-weight:600;min-width:24px}.playlist-item.active .item-number{color:#409cff}.item-content{flex:1}.item-title{font-size:1rem;font-weight:500;color:#e0e0e0;margin-bottom:4px}.playlist-item.active .item-title{color:#fff;text-shadow:0 0 10px rgba(255,255,255,.3)}.item-duration{font-size:.8rem;color:#888}.playing-icon{display:none;width:16px;height:16px;position:relative}.playlist-item.active .playing-icon{display:block}.playing-icon span{position:absolute;bottom:0;width:3px;background:#409cff;border-radius:2px;animation:bounce 1s infinite}.playing-icon span:nth-child(1){left:0;animation-delay:0s}.playing-icon span:nth-child(2){left:6px;animation-delay:.2s}.playing-icon span:nth-child(3){left:12px;animation-delay:.4s}@keyframes bounce{0%,to{height:4px}50%{height:16px}}.tutorial-player-area{display:flex;flex-direction:column;gap:30px}.player-wrapper{position:relative;width:100%;padding-top:56.25%;border-radius:24px;overflow:hidden;background:#000;box-shadow:0 30px 60px #0009;border:1px solid rgba(255,255,255,.1)}.player-wrapper:before{content:"";position:absolute;top:-2px;left:-2px;right:-2px;bottom:-2px;background:linear-gradient(45deg,rgba(64,156,255,.3),transparent,rgba(156,64,255,.3));z-index:-1;border-radius:26px;filter:blur(10px)}.video-container{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;align-items:center;justify-content:center}.video-container video,.video-container iframe{width:100%;height:100%;border:none;outline:none}.video-placeholder{display:flex;flex-direction:column;align-items:center;gap:20px;color:#666}.glow-ring{width:60px;height:60px;border-radius:50%;border:2px solid rgba(255,255,255,.1);border-top-color:#409cff;animation:spin 2s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.tutorial-info{padding:30px;background:#ffffff05;border-radius:24px;border:1px solid rgba(255,255,255,.05)}.tutorial-info h1{font-size:2rem;font-weight:600;margin-bottom:16px;letter-spacing:-.5px}.tutorial-info p{font-size:1.1rem;color:#999;line-height:1.6}@media (max-width: 1024px){.tutorial-container{grid-template-columns:1fr;padding:20px}.tutorial-sidebar{height:auto;max-height:50vh;position:relative;top:0;order:2;z-index:5}.tutorial-player-area{order:1;position:sticky;top:60px;z-index:10;background-color:#050505;padding-bottom:5px}}@media (max-width: 768px){.tutorial-info h1{font-size:1.5rem}.tutorial-info p{font-size:1rem}.tutorial-page{padding-top:60px}.player-wrapper{border-radius:12px}.tutorial-info{padding:20px}}