:root{--background:#1a1a2e;--foreground:#fff;--board-bg:#16213e;--tray-bg:#ffffff0d}*{box-sizing:border-box}body{background:var(--background);color:var(--foreground);margin:0;padding:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;overflow-x:hidden}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#ffffff0d;border-radius:4px}::-webkit-scrollbar-thumb{background:#fff3;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#ffffff4d}button{font-family:inherit}button:hover{opacity:.9}button:active{transform:scale(.98)}