*{box-sizing:border-box}html,body,#root{margin:0;width:100%;height:100%;overflow:hidden;background:#1e1f22;color:#f2f3f5;font-family:Segoe UI,system-ui,sans-serif}.app{width:100%;height:100%}.loading,.error-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;text-align:center;gap:12px}.error-screen h1{margin:0}.hint{color:#b5bac1;max-width:420px}.game-shell{display:flex;flex-direction:column;height:100%}.hud{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:#1e1f22eb;border-bottom:1px solid #3f4147;font-size:14px}.game-canvas{flex:1;width:100%;cursor:crosshair;display:block;touch-action:manipulation}code{background:#2b2d31;padding:2px 6px;border-radius:4px}