:root{color-scheme:dark;font-family:system-ui;background:#061322;color:#ecf4ff}main{max-width:1000px;margin:auto;padding:28px}header{display:flex;align-items:center;border-bottom:1px solid #21364e}h1{flex:1}small{font-size:13px;color:#63e2c5}section{margin:20px 0}.card,.numbers article{background:#10243b;border:1px solid #274765;border-radius:12px;padding:20px}input,button{padding:11px;margin:5px;border-radius:7px;border:1px solid #44637f;background:#071524;color:white}button{background:#58dcc3;color:#052019;font-weight:700;cursor:pointer}.numbers{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px}.numbers strong{display:block;font-size:25px;color:#67e6cd}.finding{border-top:1px solid #274765;padding:13px 0}#error{color:#ff9b9b}