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(width<=1100px){.dashboard-row{grid-template-columns:1fr}}.row-title{font-family:var(--display-font);align-items:center;gap:.5rem;margin-bottom:1.25rem;font-size:1.5rem;font-weight:700;display:flex}.recent-videos-list{flex-direction:column;gap:1rem;display:flex}.recent-video-item{cursor:pointer;transition:var(--transition-smooth);align-items:center;gap:1rem;padding:1rem;display:flex}.recent-video-item:hover{background:var(--bg-card-hover);border-color:#ffffff26;transform:translateY(-2px)}.recent-video-thumb{object-fit:cover;border:1px solid var(--border-light);border-radius:8px;width:100px;height:60px}.recent-video-info{flex:1}.recent-video-title{-webkit-line-clamp:1;-webkit-box-orient:vertical;margin-bottom:.25rem;font-size:.95rem;font-weight:600;line-height:1.3;display:-webkit-box;overflow:hidden}.recent-video-meta{color:var(--text-muted);align-items:center;gap:.75rem;font-size:.8rem;display:flex}.video-badge{text-transform:uppercase;border-radius:4px;padding:.1rem 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.note-timestamp{background:var(--primary);color:var(--bg-darker)}.note-content{color:var(--text-muted);font-size:.85rem;line-height:1.4}.concepts-grid{grid-template-columns:1fr;gap:1.5rem;display:grid}.concept-card{padding:2rem}.concept-header{border-bottom:1px solid var(--border-light);align-items:center;gap:1rem;margin-bottom:1rem;padding-bottom:.75rem;display:flex}.concept-icon{color:var(--primary)}.concept-title{font-family:var(--display-font);font-size:1.4rem;font-weight:700}.concept-body{color:var(--text-muted);font-size:1rem;line-height:1.7}.form-panel{max-width:700px;margin:0 auto;padding:2.5rem}.form-title{font-family:var(--display-font);text-align:center;margin-bottom:1.5rem;font-size:1.8rem;font-weight:700}.form-group{flex-direction:column;gap:.5rem;margin-bottom:1.5rem;display:flex}.form-label{color:var(--text-muted);font-size:.9rem;font-weight:600}.form-input,.form-select,.form-textarea{border:1px solid 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var(--border-light);z-index:1000;background:#0a0e1cd9;border-bottom:none;border-left:none;border-right:none;border-radius:0;justify-content:space-around;align-items:center;height:65px;padding:0 .5rem;display:flex;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -2px 10px #0000004d}.mobile-nav-item{color:var(--text-muted);cursor:pointer;transition:var(--transition-smooth);background:0 0;border:none;outline:none;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:.25rem;height:100%;font-size:.75rem;font-weight:500;display:flex}.mobile-nav-item span{font-size:.7rem}.mobile-nav-item:hover{color:var(--text-main)}.mobile-nav-item.active{color:var(--primary);text-shadow:0 0 8px var(--primary-glow)}.mobile-nav-item.active svg{color:var(--primary);filter:drop-shadow(0 0 5px var(--primary-glow))}@media (width<=767px){#root{flex-direction:column}.main-content{height:auto;padding:80px 1.25rem 90px;overflow-y:visible}.welcome-banner{margin-bottom:1.5rem;padding:1.5rem}.welcome-banner h1{font-size:1.8rem}.welcome-banner p{font-size:.95rem}.stats-grid{grid-template-columns:1fr;gap:1rem;margin-bottom:1.5rem}.dashboard-row{grid-template-columns:1fr;gap:1.5rem}.video-grid{grid-template-columns:1fr;gap:1.25rem}.detail-player-layout{grid-template-columns:1fr;gap:1.5rem;height:auto}.form-panel{padding:1.5rem 1rem}.form-title{font-size:1.4rem}}@media (width>=768px) and (width<=1024px){.sidebar{width:80px;padding:2rem .5rem}.logo-text,.sidebar-footer{display:none}.logo-container{justify-content:center;margin-bottom:2rem;padding:0}.nav-item{justify-content:center;padding:.85rem}.nav-item span{display:none}.main-content{padding:2rem}.detail-player-layout{grid-template-columns:1.2fr 1fr;gap:1.5rem}}