.btn-circle{width:46px;height:46px;color:var(--color-text-secondary);background-color:var(--background-secondary);z-index:var(--z-index-toolbar);cursor:pointer;-webkit-user-select:none;user-select:none;font-family:var(--font-family-heading);transition:var(--transition-normal);border:none;border-radius:50%;outline:none;justify-content:center;align-items:center;margin:0;padding:0;display:flex}.btn-circle:focus{outline:none}.btn-circle:disabled{cursor:not-allowed;opacity:var(--opacity-disabled);pointer-events:none}.btn-circle>svg{margin:auto;display:block}.btn-circle--border{border:3px solid var(--color-text-secondary);outline:none;overflow:hidden}.btn-circle--left{padding-left:2px;padding-right:5px;position:fixed;bottom:52px;left:5px}@media (width>=40em){.btn-circle--left{left:unset;bottom:10px}}.btn-circle--reader{position:fixed;bottom:52px;left:52px}@media (width>=40em){.btn-circle--reader{bottom:10px;left:unset;margin-left:47px}}.btn-circle--chain{position:fixed;bottom:52px;left:99px}@media (width>=40em){.btn-circle--chain{bottom:10px;left:unset;margin-left:94px}}.btn-circle--right{padding-left:2px;position:fixed;bottom:52px;right:5px}@media (width>=40em){.btn-circle--right{bottom:10px}}.btn-circle--switch{position:fixed;bottom:52px;right:52px}@media (width>=40em){.btn-circle--switch{bottom:10px}}.btn-circle--interline{position:fixed;bottom:52px;right:99px}@media (width>=40em){.btn-circle--interline{bottom:10px}}.btn-circle--apparatus{position:fixed;bottom:52px;right:146px}@media (width>=40em){.btn-circle--apparatus{bottom:10px}}.btn-circle--outline{border:3px solid var(--color-text-secondary);background-color:var(--color-text-secondary);color:var(--background-secondary);outline:var(--border-w-thick) solid var(--background-secondary);outline-offset:-4px}.btn-circle:active{color:var(--color-text-active);background-color:var(--background-active)}.btn-circle:hover{color:var(--button-color-hover);background:var(--button-background-hover)}