:root {
            --primary:#00aaff; --primary-dark:#008ecc; --primary-light:#e0f2fe;
            --bg-body:#f8faff; --bg-card:#ffffff; --text-main:#1e293b;
            --text-muted:#64748b; --border-color:#e2e8f0;
            --sidebar-width:260px; --header-height:70px; --nav-height:70px;
            --shadow:0 8px 20px rgba(0,0,0,.08); --radius:16px;
            --success:#10b981; --warning:#f59e0b; --danger:#ef4444;
            --purple:#8b5cf6; --info:#3b82f6;
        }
        body.dark-mode {
            --primary:#53d6ff; --primary-dark:#00aaff; --primary-light:#1e3a8a;
            --bg-body:#0f172a; --bg-card:#1e293b; --text-main:#f1f5f9;
            --text-muted:#94a3b8; --border-color:#334155;
            --shadow:0 8px 20px rgba(0,0,0,.4);
        }
        *{margin:0;padding:0;box-sizing:border-box;font-family:'Poppins',sans-serif;transition:background .3s,color .3s,border-color .3s;}
        body{background:var(--bg-body);color:var(--text-main);min-height:100vh;display:flex;padding-bottom:var(--nav-height);overflow-x:hidden;}
        a{text-decoration:none;color:inherit;} ul{list-style:none;}

        /* SIDEBAR */
        .sidebar{width:var(--sidebar-width);height:100vh;background:var(--bg-card);position:fixed;top:0;left:0;z-index:1200;border-right:1px solid var(--border-color);display:flex;flex-direction:column;transition:transform .3s;}
        @media(max-width:768px){.sidebar{transform:translateX(-100%);width:280px;}.sidebar.active{transform:translateX(0);box-shadow:0 0 50px rgba(0,0,0,.5);}}
        .sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:999;backdrop-filter:blur(3px);}
        .sidebar-overlay.active{display:block;}
        .brand{height:var(--header-height);display:flex;align-items:center;padding:0 24px;border-bottom:1px solid var(--border-color);gap:12px;flex-shrink:0;}
        .brand-logo{width:45px;height:45px;overflow:hidden;flex-shrink:0;}
        .brand-logo img{width:100%;height:100%;object-fit:contain;}
        .brand-text{font-size:20px;font-weight:600;color:var(--primary);}
        .sidebar-menu{padding:20px 0;flex:1;overflow-y:auto;}
        .sidebar-menu::-webkit-scrollbar{width:6px;}
        .sidebar-menu::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px;}
        .menu-item{padding:12px 24px;display:flex;align-items:center;color:var(--text-muted);font-weight:500;border-left:4px solid transparent;margin-bottom:2px;}
        .menu-item i{width:25px;font-size:18px;margin-right:12px;text-align:center;}
        .menu-item:hover,.menu-item.active{background:var(--primary-light);color:var(--primary);border-left-color:var(--primary);}
        .sidebar-footer{padding:20px;border-top:1px solid var(--border-color);margin-top:auto;flex-shrink:0;}
        .logout-btn{width:100%;padding:12px;background:rgba(239,68,68,.1);color:#ef4444;border:none;border-radius:8px;cursor:pointer;font-weight:600;display:flex;align-items:center;justify-content:center;gap:10px;transition:.2s;}
        .logout-btn:hover{background:#ef4444;color:white;}

        /* MAIN */
        .main-content{margin-left:var(--sidebar-width);min-height:100vh;display:flex;flex-direction:column;width:calc(100% - var(--sidebar-width));flex-grow:1;}
        @media(max-width:768px){.main-content{margin-left:0;width:100%;}}

        /* HEADER */
        .top-header{height:var(--header-height);background:var(--bg-card);display:flex;align-items:center;justify-content:space-between;padding:0 30px;position:sticky;top:0;z-index:900;border-bottom:1px solid var(--border-color);flex-shrink:0;}
        .header-logo{display:flex;align-items:center;gap:12px;}
        .header-logo-img{width:40px;height:40px;border-radius:10px;overflow:hidden;}
        .header-logo-img img{width:100%;height:100%;object-fit:contain;}
        .header-brand-text{font-size:23px;font-weight:700;color:var(--primary);}
        .menu-toggle{display:none;font-size:24px;cursor:pointer;color:var(--text-main);}
        @media(max-width:768px){.menu-toggle{display:block;}}
        .header-right{display:flex;align-items:center;gap:20px;}
        .notif-btn{position:relative;cursor:pointer;display:flex;align-items:center;}
        .notif-btn i{font-size:22px;color:var(--text-main);}
        .notif-badge{position:absolute;top:-8px;right:-8px;background:#ef4444;color:white;border-radius:50%;width:20px;height:20px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;border:2px solid var(--bg-card);}
        .eye-toggle{background:var(--primary-light);border:none;color:var(--text-main);width:40px;height:40px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:18px;transition:.3s;}

        /* CONTAINER */
        .container{padding:28px 30px;max-width:1400px;margin:0 auto;width:100%;flex:1;display:flex;flex-direction:column;}
        @media(max-width:768px){.container{padding:20px 15px;padding-bottom:calc(var(--nav-height)+20px);}}

        /* PAGE HEADER */
        .page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px;flex-wrap:wrap;gap:14px;}
        .page-title-wrap{display:flex;align-items:center;gap:14px;}
        .page-title-icon{width:46px;height:46px;border-radius:13px;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0;}
        .page-title-wrap h1{font-size:22px;font-weight:700;color:var(--text-main);}
        .page-title-wrap p{font-size:12px;color:var(--text-muted);margin-top:2px;}

        /* TABS */
        .tabs-wrap{display:flex;gap:6px;margin-bottom:20px;background:var(--bg-card);border-radius:12px;padding:5px;box-shadow:var(--shadow);border:1px solid var(--border-color);width:fit-content;}
        .tab-btn{padding:9px 22px;border-radius:8px;border:none;font-size:13px;font-weight:600;cursor:pointer;color:var(--text-muted);background:transparent;transition:.2s;display:flex;align-items:center;gap:7px;font-family:'Poppins',sans-serif;}
        .tab-btn.active{background:var(--primary);color:white;box-shadow:0 4px 12px rgba(0,170,255,.3);}
        .tab-btn:not(.active):hover{background:var(--primary-light);color:var(--primary);}

        /* SEARCH & FILTERS */
        .search-filter-bar{display:flex;gap:10px;margin-bottom:18px;flex-wrap:wrap;}
        .search-wrap{flex:1;min-width:200px;position:relative;}
        .search-wrap .s-icon{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:14px;pointer-events:none;}
        .search-input{width:100%;padding:10px 38px 10px 40px;border:1.5px solid var(--border-color);border-radius:10px;background:var(--bg-card);color:var(--text-main);font-size:13px;font-family:'Poppins',sans-serif;transition:.2s;}
        .search-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(0,170,255,.1);}
        .search-input::placeholder{color:var(--text-muted);}
        .search-clear{position:absolute;right:11px;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:13px;display:none;padding:2px;}
        .search-clear.show{display:block;}
        .filter-sel{padding:10px 12px;border:1.5px solid var(--border-color);border-radius:10px;background:var(--bg-card);color:var(--text-main);font-size:13px;font-family:'Poppins',sans-serif;cursor:pointer;min-width:140px;}
        .filter-sel:focus{outline:none;border-color:var(--primary);}

        /* RESULTS */
        .results-info{font-size:12px;color:var(--text-muted);margin-bottom:16px;font-weight:500;min-height:18px;}
        .results-info strong{color:var(--primary);}

        /* PLAYER BANNER */
        .player-section{display:none;background:#000;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border-color);margin-bottom:26px;animation:slideDown .3s ease;}
        .player-section.visible{display:block;}
        @keyframes slideDown{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}
        .player-inner{display:flex;flex-wrap:wrap;}
        .player-video-side{flex:1;min-width:300px;background:#000;position:relative;}
        /* FULLSCREEN FIX */
        .player-video-side {
            position: relative;
        }
        .player-video-side iframe{
            width:100%;
            aspect-ratio:16/9;
            display:block;
            border:none;
        }
        .player-info-side{width:300px;min-width:260px;padding:20px;display:flex;flex-direction:column;gap:10px;border-left:1px solid var(--border-color);overflow-y:auto;max-height:350px;background:var(--bg-card);}
        @media(max-width:860px){.player-info-side{width:100%;max-height:none;border-left:none;border-top:1px solid var(--border-color);}}
        .player-cat-tag{font-size:10px;font-weight:700;padding:3px 10px;border-radius:20px;text-transform:uppercase;letter-spacing:.5px;width:fit-content;}
        .player-title{font-size:14px;font-weight:700;color:var(--text-main);line-height:1.5;}
        .player-meta-row{display:flex;gap:14px;font-size:11px;color:var(--text-muted);flex-wrap:wrap;}
        .player-meta-row span{display:flex;align-items:center;gap:4px;}
        .player-desc{font-size:12px;color:var(--text-muted);line-height:1.65;flex:1;}
        .player-close-btn{margin-top:6px;padding:8px 16px;background:rgba(239,68,68,.08);border:1px solid rgba(239,68,68,.2);color:#ef4444;border-radius:8px;font-size:12px;font-weight:600;cursor:pointer;font-family:'Poppins',sans-serif;display:flex;align-items:center;gap:6px;transition:.2s;width:fit-content;}
        .player-close-btn:hover{background:#ef4444;color:white;}

        /* VIDEO GRID */
        .videos-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:18px;}
        @media(max-width:500px){.videos-grid{grid-template-columns:repeat(2,1fr);gap:11px;}}

        /* VIDEO CARD */
        .video-card{background:var(--bg-card);border-radius:13px;border:1.5px solid var(--border-color);overflow:hidden;cursor:pointer;transition:all .22s ease;position:relative;}
        .video-card:hover{border-color:var(--primary);box-shadow:0 8px 28px rgba(0,170,255,.15);transform:translateY(-3px);}
        .video-card.playing{border-color:var(--primary);box-shadow:0 0 0 3px rgba(0,170,255,.25);}
        .playing-badge{display:none;position:absolute;top:8px;left:8px;background:var(--primary);color:white;font-size:9px;font-weight:700;padding:3px 8px;border-radius:20px;letter-spacing:.3px;z-index:2;}
        .video-card.playing .playing-badge{display:block;}
        .vc-thumb{position:relative;width:100%;padding-top:56.25%;background:#0f172a;overflow:hidden;}
        .vc-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .3s;}
        .video-card:hover .vc-thumb img{transform:scale(1.05);}
        .vc-thumb-ph{position:absolute;inset:0;display:none;align-items:center;justify-content:center;background:linear-gradient(135deg,#0f172a,#1e293b);}
        .vc-thumb-ph i{font-size:28px;color:rgba(255,255,255,.18);}
        .vc-play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.28);opacity:0;transition:opacity .2s;}
        .video-card:hover .vc-play-overlay{opacity:1;}
        .vc-play-overlay i{font-size:38px;color:white;filter:drop-shadow(0 2px 8px rgba(0,0,0,.5));}
        .vc-dur{position:absolute;bottom:7px;right:8px;background:rgba(0,0,0,.82);color:white;font-size:10px;font-weight:700;padding:2px 7px;border-radius:5px;}
        .vc-body{padding:12px 13px 13px;}
        .vc-tags{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:7px;}
        .vc-tag{font-size:9px;font-weight:700;padding:2px 8px;border-radius:20px;text-transform:uppercase;letter-spacing:.4px;}
        .tag-started {background:rgba(16,185,129,.12);color:#10b981;}
        .tag-tips    {background:rgba(245,158,11,.12);color:var(--warning);}
        .tag-advanced{background:rgba(139,92,246,.12);color:var(--purple);}
        .tag-general {background:rgba(100,116,139,.1);color:var(--text-muted);}
        .vc-title{font-size:12.5px;font-weight:600;color:var(--text-main);line-height:1.45;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
        .vc-title mark{background:rgba(0,170,255,.18);color:var(--primary);border-radius:3px;padding:0 2px;font-weight:700;}
        .vc-foot{display:flex;align-items:center;justify-content:space-between;}
        .vc-plat{display:flex;align-items:center;gap:5px;font-size:11px;color:var(--text-muted);}
        .vc-plat i{font-size:12px;}
        .vc-views{font-size:11px;color:var(--text-muted);display:flex;align-items:center;gap:4px;}

        /* NO RESULTS */
        .no-results{text-align:center;padding:60px 20px;grid-column:1/-1;}
        .no-results i{font-size:48px;color:var(--border-color);margin-bottom:14px;display:block;}
        .no-results h3{font-size:16px;color:var(--text-main);margin-bottom:6px;}
        .no-results p{font-size:13px;color:var(--text-muted);}

        /* BOTTOM NAV */
        .bottom-nav{position:fixed;bottom:0;left:0;right:0;height:var(--nav-height);background:var(--bg-card);border-top:1px solid var(--border-color);display:flex;justify-content:space-around;align-items:center;z-index:1000;padding:0 20px;box-shadow:0 -5px 20px rgba(0,0,0,.1);}
        .nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:var(--text-muted);padding:8px 12px;border-radius:10px;transition:.3s;flex:1;max-width:80px;text-decoration:none;}
        .nav-item i{font-size:20px;} .nav-item span{font-size:11px;font-weight:500;}
        .nav-item.active,.nav-item:hover{color:var(--primary);background:var(--primary-light);}

        /* LOGOUT MODAL */
        .modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.7);z-index:3000;align-items:center;justify-content:center;backdrop-filter:blur(3px);}
        .modal-overlay.active{display:flex;}
        .mini-modal{background:var(--bg-card);border-radius:20px;padding:30px;max-width:380px;width:90%;text-align:center;box-shadow:var(--shadow);border:1px solid var(--border-color);animation:slideUp .3s;}
        @keyframes slideUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
        .mini-modal .m-icon{font-size:46px;color:var(--danger);margin-bottom:14px;display:block;}
        .mini-modal h3{font-size:18px;font-weight:700;margin-bottom:8px;color:var(--danger);}
        .mini-modal p{font-size:13px;color:var(--text-muted);margin-bottom:22px;line-height:1.6;}
        .mini-modal-btns{display:flex;gap:12px;}
        .mini-modal-btns button{flex:1;padding:11px;border-radius:9px;border:none;font-weight:600;font-size:13px;cursor:pointer;font-family:'Poppins',sans-serif;transition:.2s;}
        .btn-m-cancel{background:var(--border-color);color:var(--text-main);}
        .btn-m-cancel:hover{background:#cbd5e1;}
        .btn-m-danger{background:var(--danger);color:white;}
        .btn-m-danger:hover{background:#dc2626;}

        .menu-group-label {
            padding: 16px 24px 5px;
            font-size: 10px;
            font-weight: 700;
            letter-spacing: 1.2px;
            text-transform: uppercase;
            color: var(--text-muted);
            opacity: 0.55;
            pointer-events: none;
            user-select: none;
            list-style: none;
        }