:root{--edu-primary: #667eea;--edu-secondary: #764ba2;--edu-background: #f8fafc;--edu-surface: #ffffff;--edu-text: #1e293b;--edu-text-muted: #64748b}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{width:100%;height:100%;overflow:hidden;background:linear-gradient(135deg,#667eea,#764ba2);font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;color:var(--edu-text);touch-action:none;user-select:none;-webkit-user-select:none}#app{width:100%;height:100%;position:relative}canvas{display:block;touch-action:none}body{overscroll-behavior:none}@supports (padding: max(0px)){body{padding-left:max(0px,env(safe-area-inset-left));padding-right:max(0px,env(safe-area-inset-right));padding-top:max(0px,env(safe-area-inset-top));padding-bottom:max(0px,env(safe-area-inset-bottom))}}