:root{--primary: #2ecc71;--primary-hover: #27ae60;--danger: #e74c3c;--bg: #121212;--panel: #252525;--text-color: #ffffff;--text-muted: #aaaaaa;--transition-fast: .2s ease;--transition-normal: .3s ease;--z-sidebar: 1000;--z-video-grid: 1000;--z-chat: 1500;--z-login: 2000;--z-modal-overlay: 2999;--z-modal: 3000;--z-video-expanded: 4000}*,*:before,*:after{box-sizing:border-box}body,html{margin:0;padding:0;width:100%;height:100%;overflow:hidden;background:var(--bg);font-family:Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--text-color);-webkit-font-smoothing:antialiased}