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var(--border);background:var(--bg-card)}.stat strong{display:block;font-size:1.75rem;color:var(--accent-hover)}.stat span{color:var(--text-muted);font-size:.85rem}.empty-state{text-align:center;padding:3rem 1rem;color:var(--text-muted)}.mobile-menu-btn{display:none}@media(max-width:960px){.tracks-grid,.feature-row,.stat-row,.player-layout{grid-template-columns:1fr;height:auto;max-height:none;overflow:visible}.player-main{height:auto;max-height:none}.player-video{max-height:min(56vh,calc(100vh - var(--header-h) - 8rem));max-width:100%;width:100%}.player-info{max-height:none}.module-list{height:auto;max-height:min(50vh,420px)}.app-body{grid-template-columns:1fr}.sidebar{position:fixed;left:0;top:var(--header-h);bottom:0;width:min(300px,88vw);z-index:30;transform:translate(-105%);transition:transform .25s ease;box-shadow:var(--shadow)}.sidebar.open{transform:translate(0)}.mobile-menu-btn{display:inline-flex}.nav-links{display:none}.hero-content{margin-left:1.25rem}}@media(max-width:640px){.app-title span,.brand-meta{display:none}}