@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";:root{--bg-primary:#0a0e1a;--bg-secondary:#0f1628;--bg-card:#141c2e;--bg-card-hover:#1a2440;--bg-glass:#141c2eb3;--accent-primary:#6366f1;--accent-secondary:#8b5cf6;--accent-gradient:linear-gradient(135deg, #6366f1, #8b5cf6);--accent-glow:#6366f140;--text-primary:#e2e8f0;--text-secondary:#94a3b8;--text-muted:#475569;--border-subtle:#6366f11a;--border-card:#ffffff0f;--success:#22c55e;--warning:#f59e0b;--danger:#ef4444;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--shadow-card:0 4px 24px #0000004d;--shadow-glow:0 0 40px #6366f126;--shadow-lg:0 20px 60px #00000080;--transition:.2s cubic-bezier(.4, 0, .2, 1);--transition-slow:.4s cubic-bezier(.4, 0, .2, 1)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;font-size:15px;line-height:1.6}#root{flex-direction:column;min-height:100vh;display:flex}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;outline:none;font-family:inherit}input,textarea{outline:none;font-family:inherit}img{max-width:100%;display:block}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{border-radius:var(--radius-full);background:#6366f14d}::-webkit-scrollbar-thumb:hover{background:#6366f180}.layout{min-height:100vh;display:flex}.sidebar{background:var(--bg-secondary);border-right:1px solid var(--border-card);z-index:50;width:260px;min-height:100vh;transition:transform var(--transition);flex-direction:column;display:flex;position:fixed;top:0;left:0}.sidebar-logo{border-bottom:1px solid var(--border-card);padding:24px 20px}.sidebar-logo h1{background:var(--accent-gradient);-webkit-text-fill-color:transparent;letter-spacing:-.3px;-webkit-background-clip:text;background-clip:text;font-size:18px;font-weight:700}.sidebar-logo p{color:var(--text-muted);margin-top:2px;font-size:11px}.sidebar-nav{flex:1;padding:16px 12px;overflow-y:auto}.sidebar-nav-item{border-radius:var(--radius-sm);color:var(--text-secondary);transition:all var(--transition);align-items:center;gap:10px;margin-bottom:2px;padding:10px 12px;font-size:14px;font-weight:500;display:flex}.sidebar-nav-item:hover{background:var(--bg-card);color:var(--text-primary)}.sidebar-nav-item.active{background:var(--accent-glow);color:var(--accent-primary)}.sidebar-footer{border-top:1px solid var(--border-card);padding:16px 12px}.main-content{flex-direction:column;flex:1;min-height:100vh;margin-left:260px;display:flex}.main-header{z-index:40;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-card);background:#0a0e1ad9;justify-content:space-between;align-items:center;height:64px;padding:0 32px;display:flex;position:sticky;top:0}.page-content{flex:1;width:100%;max-width:1400px;margin:0 auto;padding:32px}.card{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-lg);transition:all var(--transition)}.card:hover{border-color:var(--border-subtle);box-shadow:var(--shadow-card);transform:translateY(-2px)}.course-card{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-lg);transition:all var(--transition);cursor:pointer;flex-direction:column;display:flex;overflow:hidden}.course-card:hover{border-color:#6366f14d;transform:translateY(-3px);box-shadow:0 8px 32px #0000004d,0 0 0 1px #6366f11a}.course-card-thumb{aspect-ratio:16/9;object-fit:cover;background:var(--bg-secondary);width:100%;position:relative;overflow:hidden}.course-card-thumb img{object-fit:cover;width:100%;height:100%}.course-card-thumb-placeholder{background:linear-gradient(135deg,#1e293b 0%,#0f172a 100%);justify-content:center;align-items:center;width:100%;height:100%;font-size:40px;display:flex}.course-card-body{flex-direction:column;flex:1;padding:16px;display:flex}.course-card-title{color:var(--text-primary);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-bottom:6px;font-size:14px;font-weight:600;line-height:1.4;display:-webkit-box;overflow:hidden}.course-card-meta{color:var(--text-muted);flex:1;margin-bottom:12px;font-size:12px}.progress-bar-wrap{border-radius:var(--radius-full);background:#ffffff0f;height:4px;overflow:hidden}.progress-bar-fill{background:var(--accent-gradient);border-radius:var(--radius-full);height:100%;transition:width .5s}.progress-label{color:var(--text-muted);justify-content:space-between;margin-top:6px;font-size:11px;display:flex}.grid-modules{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;display:grid}.grid-courses{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;display:grid}.module-card{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition);padding:24px;position:relative;overflow:hidden}.module-card:before{content:"";background:var(--accent-gradient);opacity:0;height:3px;transition:opacity var(--transition);position:absolute;top:0;left:0;right:0}.module-card:hover{box-shadow:var(--shadow-card), var(--shadow-glow);border-color:#6366f14d;transform:translateY(-4px)}.module-card:hover:before{opacity:1}.module-card-icon{border-radius:var(--radius-md);background:var(--accent-glow);justify-content:center;align-items:center;width:44px;height:44px;margin-bottom:14px;font-size:20px;display:flex}.module-card-title{color:var(--text-primary);margin-bottom:6px;font-size:16px;font-weight:700}.module-card-stats{color:var(--text-muted);margin-bottom:16px;font-size:12px}.page-header{margin-bottom:28px}.breadcrumb{color:var(--text-muted);align-items:center;gap:8px;margin-bottom:10px;font-size:13px;display:flex}.breadcrumb a:hover{color:var(--accent-primary)}.breadcrumb-sep{color:var(--text-muted);opacity:.5}.page-title{color:var(--text-primary);letter-spacing:-.5px;font-size:28px;font-weight:800;line-height:1.2}.page-subtitle{color:var(--text-secondary);margin-top:6px;font-size:14px}.lesson-list{flex-direction:column;gap:6px;display:flex}.lesson-item{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition);align-items:center;gap:14px;padding:14px 16px;display:flex}.lesson-item:hover{background:var(--bg-card-hover);border-color:#6366f133}.lesson-item.active{background:#6366f114;border-color:#6366f166}.lesson-item-num{border-radius:var(--radius-full);flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:13px;font-weight:600;display:flex}.lesson-item-num.done{color:var(--success);background:#22c55e26}.lesson-item-num.pending{color:var(--text-muted);background:#ffffff0d}.lesson-item-num.current{background:var(--accent-glow);color:var(--accent-primary)}.lesson-item-info{flex:1;min-width:0}.lesson-item-title{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;font-size:14px;font-weight:500;overflow:hidden}.lesson-item-meta{color:var(--text-muted);margin-top:2px;font-size:11px}.lesson-item-progress{flex-shrink:0;width:60px}.video-wrapper{border-radius:var(--radius-lg);background:#000;width:100%;position:relative;overflow:hidden}.video-wrapper video{width:100%;display:block}.autosave-indicator{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:var(--success);border-radius:var(--radius-full);opacity:0;transition:opacity var(--transition);pointer-events:none;background:#000000b3;align-items:center;gap:6px;padding:6px 12px;font-size:12px;display:flex;position:absolute;bottom:80px;right:16px}.autosave-indicator.visible{opacity:1}.lesson-page{grid-template-rows:auto 1fr;grid-template-columns:1fr 360px;align-items:start;gap:20px;min-height:calc(100vh - 64px);display:grid}.lesson-main{min-width:0}.lesson-sidebar{flex-direction:column;gap:16px;max-height:calc(100vh - 104px);display:flex;position:sticky;top:84px;overflow-y:auto}.notes-panel{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-lg);flex-direction:column;display:flex;overflow:hidden}.notes-header{border-bottom:1px solid var(--border-card);justify-content:space-between;align-items:center;padding:14px 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8px;font-size:12px}.btn-danger-ghost:hover{border-radius:var(--radius-sm);background:#ef44441a}.btn-sm{padding:7px 12px;font-size:12px}.btn-icon{border-radius:var(--radius-md);justify-content:center;align-items:center;width:36px;height:36px;padding:0;display:flex}.login-page{background:var(--bg-primary);justify-content:center;align-items:center;min-height:100vh;display:flex;position:relative;overflow:hidden}.login-bg-glow{pointer-events:none;background:radial-gradient(circle,#6366f11f 0%,#0000 70%);border-radius:50%;width:600px;height:600px;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.login-card{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-xl);z-index:1;width:100%;max-width:400px;box-shadow:var(--shadow-lg);padding:40px;position:relative}.login-logo{text-align:center;margin-bottom:32px}.login-logo-icon{border-radius:var(--radius-lg);background:var(--accent-gradient);justify-content:center;align-items:center;width:64px;height:64px;margin:0 auto 16px;font-size:28px;display:flex;box-shadow:0 8px 24px #6366f166}.login-logo h1{color:var(--text-primary);letter-spacing:-.3px;font-size:22px;font-weight:800}.login-logo p{color:var(--text-muted);margin-top:4px;font-size:14px}.form-group{margin-bottom:16px}.form-label{color:var(--text-secondary);margin-bottom:8px;font-size:13px;font-weight:600;display:block}.form-input{background:var(--bg-secondary);border:1px solid var(--border-card);border-radius:var(--radius-md);width:100%;color:var(--text-primary);transition:all var(--transition);padding:12px 14px;font-size:14px}.form-input:focus{border-color:#6366f180;box-shadow:0 0 0 3px 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p{color:var(--text-secondary);font-size:13px}.spinner{border:3px solid #6366f133;border-top-color:var(--accent-primary);border-radius:50%;width:32px;height:32px;animation:.8s linear infinite spin}.spinner-sm{border-width:2px;width:16px;height:16px}@keyframes spin{to{transform:rotate(360deg)}}.loading-center{justify-content:center;align-items:center;min-height:200px;display:flex}.stats-row{gap:16px;margin-bottom:28px;display:flex}.stat-card{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-lg);flex:1;padding:20px}.stat-value{color:var(--text-primary);letter-spacing:-.5px;font-size:28px;font-weight:800}.stat-label{color:var(--text-muted);margin-top:4px;font-size:12px}.playlist-panel{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-lg);overflow:hidden}.playlist-header{border-bottom:1px solid var(--border-card);padding:14px 16px}.playlist-header h3{color:var(--text-primary);text-transform:uppercase;letter-spacing:.5px;font-size:13px;font-weight:700}.playlist-list{max-height:380px;overflow-y:auto}.playlist-item{cursor:pointer;transition:background var(--transition);border-bottom:1px solid #ffffff05;align-items:center;gap:10px;padding:10px 14px;display:flex}.playlist-item:hover{background:var(--bg-card-hover)}.playlist-item.active{background:#6366f11a}.playlist-item-dot{border-radius:var(--radius-full);flex-shrink:0;justify-content:center;align-items:center;width:24px;height:24px;font-size:10px;font-weight:700;display:flex}.playlist-item-dot.done{color:var(--success);background:#22c55e26}.playlist-item-dot.current{background:var(--accent-glow);color:var(--accent-primary)}.playlist-item-dot.pending{color:var(--text-muted);background:#ffffff0d}.playlist-item-name{color:var(--text-secondary);text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:12px;line-height:1.4;overflow:hidden}.playlist-item.active 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