:root{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;color:#203548;background:#f5f8fb;line-height:1.7;font-synthesis:none}*{box-sizing:border-box}body{margin:0}header,main,footer{width:min(1240px,calc(100% - 48px));margin:auto}header{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:24px 0;border-bottom:1px solid #d9e4ec}h1{font-size:26px;margin:2px 0 0;line-height:1.4}h2{font-size:22px;margin:0 0 16px;line-height:1.5}h3{font-size:17px;margin:0 0 10px}a{color:#21647e;text-underline-offset:4px}header a{font-size:14px;white-space:nowrap}.eyebrow{font-size:12px;letter-spacing:.12em;color:#4c7184;font-weight:700}.intro{margin:24px 0;font-size:16px;color:#526b7e}.workspace{display:grid;grid-template-columns:280px minmax(0,1fr);gap:24px}.controls{padding:24px;background:white;border:1px solid #d9e4ec;border-radius:12px;align-self:start}.controls h2{font-size:18px}.controls label{display:block;font-size:14px;font-weight:700;margin:14px 0 8px}select,button{font:inherit;max-width:100%;border:1px solid #b9ccd9;border-radius:7px;background:white;color:#24495d}select{width:100%;font-size:14px;padding:12px 8px}button{padding:10px 14px;cursor:pointer;font-size:14px;min-height:44px}button:hover:enabled{background:#e8f2f8;border-color:#5e8ca7}button:disabled{opacity:.4;cursor:default}button:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #1476b8;outline-offset:4px}.help{font-size:13px;color:#62798a;line-height:1.8;margin:10px 0 16px}.divider{border-top:1px solid #e3ebf1;margin:22px 0}.direction{display:flex;gap:12px;flex-wrap:wrap;font-size:14px;margin-bottom:20px}.check{display:flex!important;gap:10px;align-items:center}.check input{width:18px;height:18px;accent-color:#176886;flex-shrink:0}#reset{width:100%;margin-top:10px}.lesson-heading{display:flex;justify-content:space-between;align-items:center;gap:18px;margin:0 0 16px}.lesson-heading h2{margin:4px 0 0}.badge{font-size:12px;background:#e4eef5;color:#305d77;padding:4px 10px;border-radius:5px;white-space:nowrap}.comparison{display:grid;grid-template-columns:minmax(160px,1fr) minmax(0,2.25fr);gap:14px;align-items:stretch}.components{display:grid;grid-template-rows:1fr 1fr;gap:14px}figure{margin:0;border:1px solid #d5e1eb;border-radius:10px;overflow:hidden;background:white;min-width:0}figcaption{display:flex;align-items:center;gap:7px;font-size:14px;font-weight:700;padding:12px 14px}figcaption>span:not(.eye-label){font-size:12px;color:#69818f;font-weight:400;margin-left:auto}.eye-label{border:1px solid #b0c2ce;border-radius:4px;font-size:12px;line-height:20px;text-align:center;min-width:22px}.colored .right{background:#dbf7ff;color:#126580}.colored .left{background:#fff1d8;color:#8b5604}svg{display:block;width:100%;height:auto;background:#101e2c}.components svg{max-height:145px}.components p{font-size:12px;line-height:1.5;margin:8px 12px;color:#5a7487;min-height:18px}.combined{display:flex;flex-direction:column;background:#101e2c;color:#f4f8fc}.combined figcaption{background:#1c3042;color:#f4f8fc}.combined figcaption>span{color:#b4c9d8}.combined svg{flex:1;min-height:220px}.view-labels{display:flex;justify-content:space-between;color:#a6bccb;font-size:12px;padding:0 16px}.combined p{background:#1c3042;margin:14px 0 0;padding:14px 18px;text-align:center;font-size:15px;line-height:1.6;min-height:52px}.diagram-note{font-size:12px;color:#617989;margin:14px 0 20px}.explanation{border-left:3px solid #45869e;padding:2px 0 2px 20px}.explanation p{font-size:15px;margin:10px 0}.condition{font-size:13px!important;color:#5c7485}.watch{font-weight:650;color:#245b74}.navigation{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:24px}.navigation span{font-size:13px;color:#617989}.limitations{margin:32px 0 22px;border:1px solid #d9e4ec;border-radius:8px;background:white;padding:16px 20px}.limitations summary{font-size:14px;font-weight:700;cursor:pointer}.limitations p{font-size:14px;color:#566f80}.notice{font-size:13px;color:#566f80;line-height:1.8;border-left:3px solid #a2b6c5;padding-left:16px;margin:22px 0 32px}#error{padding:16px;background:#fff0ed;color:#8c3025;border:1px solid #d7a097}footer{padding:20px 0;border-top:1px solid #d9e4ec;display:flex;justify-content:space-between;gap:20px;color:#637b8e;font-size:12px}@media(max-width:980px){.workspace{grid-template-columns:240px minmax(0,1fr);gap:18px}.controls{padding:18px}.comparison{grid-template-columns:1fr}.components{grid-template-columns:1fr 1fr;grid-template-rows:auto}.components svg{max-height:125px}.combined svg{max-height:340px}}@media(max-width:680px){header,main,footer{width:calc(100% - 32px)}header{align-items:flex-start;gap:12px;padding:18px 0}header a{font-size:12px}h1{font-size:21px}.intro{font-size:14px}.workspace{grid-template-columns:1fr}.controls{padding:18px}.controls h2{margin-bottom:8px}.divider{margin:16px 0}.help{margin-bottom:10px}.direction{margin-bottom:12px}.controls select{font-size:16px}.lesson-heading{margin-top:8px}.lesson-heading h2{font-size:20px}.components figcaption{font-size:12px;padding:10px}.components p{min-height:36px}.combined svg{min-height:200px}.navigation button{font-size:13px;padding:9px}.explanation{padding-left:14px}footer{flex-direction:column;gap:4px}}