:root{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;color:#172b47;background:#f5f7fb;line-height:1.8;font-synthesis:none}*{box-sizing:border-box}body{margin:0}header,main,footer{width:min(1180px,calc(100% - 48px));margin:auto}header,footer{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;padding:22px 0;font-size:.875rem}header{border-bottom:1px solid #d5deeb}a{color:#205bb4;text-underline-offset:4px}button,select,input{font:inherit}h1{font-size:2rem;line-height:1.4;margin:4px 0}h2{font-size:1.25rem;margin:0 0 16px}h3{font-size:1rem;margin:0}p{margin:10px 0}.heading{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:26px 0}.eyebrow{color:#376198;font-size:.75rem;font-weight:700;letter-spacing:.1em;margin:0}.badge{padding:4px 12px;background:#e5edf9;border-radius:5px;font-size:.875rem;white-space:nowrap}.workspace{display:grid;grid-template-columns:300px minmax(0,1fr);gap:24px}.controls{align-self:start;background:white;border:1px solid #d5deeb;border-radius:14px;padding:22px}.controls label{display:block;font-size:.875rem;font-weight:650;margin:16px 0 8px}select{width:100%;min-height:48px;padding:10px 8px;background:white;color:#172b47;border:1px solid #b3c5dc;border-radius:7px;font-size:1rem}button{min-height:44px;padding:9px 12px;border:1px solid #b3c5dc;border-radius:7px;background:white;color:#205bb4;cursor:pointer;font-size:.875rem}button:hover:enabled{background:#e9f0fc}button:disabled{opacity:.45;cursor:default}.check{display:flex!important;align-items:center;gap:8px}.check input{width:20px;height:20px;accent-color:#205bb4;flex-shrink:0}#reset,#phase{width:100%;margin-top:14px}button:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid #1668df;outline-offset:4px}.help{font-size:.875rem;color:#506781}.lesson{min-width:0}figure{margin:0;overflow:hidden;border-radius:12px;border:1px solid #cfdae8;background:#0b1422;color:#edf3fb}figcaption{display:flex;justify-content:space-between;gap:10px;padding:12px 18px;font-size:.875rem;background:#182d48}figcaption span{color:#c7d7ee}svg{display:block;width:100%;height:auto;background:#0b1422}.combined svg{max-height:360px}.components{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:16px}.components svg{max-height:165px}.sides{display:flex;justify-content:space-between;font-size:.875rem;color:#b7c9e3;padding:4px 18px}#finding{margin:12px 0 0;padding:14px 18px;background:#182d48;text-align:center}.explanation{border-left:3px solid #2865c8;padding:0 0 0 18px;margin-top:24px}.navigation{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:24px}.navigation span{font-size:.875rem}.limits{margin:36px 0 24px;padding:24px;background:white;border:1px solid #d5deeb;border-radius:14px}.limits ol{padding-left:24px}.limits p{font-size:.875rem}.controls details{margin-top:22px}summary{font-size:.875rem;cursor:pointer;font-weight:650}details p{color:#506781}details svg{margin-top:14px;border-radius:8px}.notice{border-left:3px solid #94a9c5;padding-left:16px;font-size:.875rem;color:#506781;margin-bottom:30px}footer{border-top:1px solid #d5deeb;color:#506781}#error{padding:16px;background:#fff0eb;color:#8b2c16}[hidden]{display:none!important}@media(max-width:800px){.workspace{grid-template-columns:1fr}.controls{padding:20px}.heading{align-items:flex-start}header,main,footer{width:calc(100% - 32px)}h1{font-size:1.75rem}.components figcaption{padding:10px;font-size:.875rem}.combined svg{max-height:none}.limits{padding:20px}.navigation{flex-wrap:wrap}}