.art-work{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:36px;padding:30px;align-items:center}.art-work figure{margin:0;text-align:center}.art-work img{display:block;max-width:100%;width:auto;height:auto;max-height:620px;margin:auto;border:10px solid #806b3e;box-shadow:0 4px 16px #0003}.art-work figcaption{font-size:10px;line-height:1.6;margin-top:14px}.art-work a{color:var(--muted);text-underline-offset:3px}.art-details h2{font-size:38px;margin:12px 0 22px}.art-details dl{display:grid;gap:14px}.art-details dl>div{display:grid;grid-template-columns:100px 1fr;gap:14px}.art-details dt{color:var(--muted);font-size:12px}.art-details dd{margin:0;font-weight:700;font-size:14px}.art-details>p{font-size:14px}.art-source{font-size:12px}.geometry-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:18px}.geometry-start{text-align:center;margin-bottom:26px}.geometry-card{padding:22px;text-align:center}.geometry-card h2{margin:8px 0 12px}.geometry-card strong{font-size:12px}.geometry-card p{font-size:13px;text-align:left;margin-bottom:0}.geometry-shape{width:160px;max-width:100%;height:130px;fill:#77bda54d;stroke:var(--green);stroke-width:4;stroke-linejoin:round}.geometry-exercise{max-width:600px;padding:26px;margin:auto;text-align:center}.geometry-exercise h1{font-size:24px;line-height:1.5;min-height:72px;margin:0 0 16px}.geometry-exercise .geometry-shape{width:230px;height:190px;display:block;margin:auto}.geometry-feedback{height:60px;display:flex;justify-content:center;align-items:center;margin:10px 0;font-weight:800}.geometry-check{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:#397b58;color:white;font-size:26px}.geometry-correction{color:var(--ink);border-bottom:2px solid #c69d62;padding:6px 12px}.geometry-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.geometry-options button{min-height:48px;margin:0;white-space:normal}.geometry-options button:disabled{opacity:.8}[data-theme=dark] .geometry-shape{stroke:#8ad1b8;fill:#8ad1b830}@media(max-width:700px){.art-work{grid-template-columns:1fr;padding:20px;gap:24px}.art-work img{max-height:480px}.art-details h2{font-size:30px}header nav{grid-template-columns:repeat(5,minmax(0,1fr))}header nav button{padding-left:2px;padding-right:2px}header nav button span{font-size:9px}.geometry-exercise{padding:22px 16px}.geometry-exercise h1{font-size:21px}}

@media(min-width:701px) and (max-width:1850px){header{height:auto;min-height:100px;flex-wrap:wrap;padding-top:16px;padding-bottom:14px;gap:12px}header nav{order:4;width:100%;justify-content:center;flex-wrap:wrap}header .brand{margin-right:auto}}

.art-browser{display:flex;justify-content:center;align-items:center;gap:20px;margin:0 0 20px}.art-browser button{width:48px;min-height:44px;padding:8px;font-size:21px}.art-browser span{font-size:13px;font-variant-numeric:tabular-nums}.art-gallery{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px;margin-top:24px}.art-thumbnail{display:flex;flex-direction:column;align-items:center;gap:10px;padding:14px;color:var(--ink);text-align:center}.art-thumbnail img{width:100%;height:125px;object-fit:contain}.art-thumbnail strong{font-size:12px;line-height:1.5}.art-thumbnail small{font-size:10px;color:var(--muted);line-height:1.5;margin-top:auto}.art-thumbnail[aria-pressed=true]{border:2px solid var(--green);box-shadow:0 0 0 2px #77bda533}.art-selected .art-image-frame{height:460px;display:flex;align-items:center;justify-content:center}.art-selected .art-image-frame a{display:flex;align-items:center;justify-content:center;width:100%;height:100%}.art-selected .art-image-frame img{max-height:100%;max-width:100%;object-fit:contain}.art-selected .art-details dd{overflow-wrap:anywhere}[data-theme=dark] .art-thumbnail[aria-pressed=true]{border-color:#8ad1b8}@media(max-width:900px){.art-gallery{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:500px){.art-gallery{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.art-thumbnail{padding:10px}.art-thumbnail img{height:105px}.art-selected .art-image-frame{height:360px}}

.geometry-mode-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,200px),1fr));gap:16px}.geometry-mode{padding:22px;text-align:center}.geometry-mode h2{font-size:18px;min-height:46px}.geometry-rules{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:24px}.geometry-measure text{fill:var(--ink);stroke:none;font:700 12px Nunito}.geometry-grid .geometry-card small{display:block;color:var(--muted);margin-top:12px}.geometry-mode button{min-height:44px}@media(max-width:600px){.geometry-rules{grid-template-columns:1fr}}

.geometry-rule{padding:24px}.geometry-rule h2{margin-top:0}