:root{--color-primary: #04adff;--color-text: #1f1f1f;--color-yellow: #fff737;--color-white: #ffffff;--color-stroke: #d9dde3;--color-bg-soft: #f7f7f5;--radius-xl: 24px;--radius-pill: 999px}*,*:before,*:after{box-sizing:border-box}html,body,#root{margin:0;height:100%;width:100%;overflow:hidden;font-family:Nunito,system-ui,-apple-system,Segoe UI,sans-serif;background:#0b1220;color:var(--color-text)}button{font-family:inherit;cursor:pointer}.lesson-submit-spinner{width:24px;height:24px;flex:0 0 24px;border:3px solid rgb(31 31 31 / 24%);border-top-color:var(--color-text);border-radius:50%;animation:lesson-submit-spin .8s linear infinite}@keyframes lesson-submit-spin{to{transform:rotate(360deg)}}