:root{--bg: #f6f6f4;--fg: #1d1d1f;--muted: #6b6b70;--card: #ffffff;--border: #dcdcdf;--accent: #1f6feb;--on-accent: #ffffff;color-scheme:light dark}@media(prefers-color-scheme:dark){:root{--bg: #161618;--fg: #ececee;--muted: #a0a0a8;--card: #222226;--border: #3a3a40;--accent: #58a6ff;--on-accent: #0d1117}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.5 system-ui,-apple-system,Segoe UI,sans-serif}main{max-width:720px;margin:0 auto;padding:16px}a{color:var(--accent)}h1{font-size:1.6rem}.puzzle ul{padding-left:1.2rem}.breadcrumb{color:var(--muted);margin-bottom:12px}.hold{color:var(--muted);margin:0 0 8px}.scramble{font:600 clamp(1.15rem,4.5vw,1.6rem)/1.6 ui-monospace,"SF Mono",Menlo,monospace;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:14px 16px;margin:0;overflow-wrap:anywhere}.slice-note{color:var(--muted);font-size:.9rem;margin:6px 0 0}.actions{display:flex;gap:10px;margin:16px 0}.actions button{flex:1}.l2c h1{font-size:1.3rem;margin:0 0 4px}.case h2{font-size:1.1rem;margin:0}.case:focus{outline:none}button{font:inherit;font-weight:600;padding:12px;border-radius:10px;border:1px solid var(--border);background:var(--card);color:var(--fg);cursor:pointer}button.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}button:disabled{opacity:.5;cursor:default}.case{display:grid;gap:16px;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:16px}.case[hidden]{display:none}.case figure{margin:0;text-align:center}.case svg.scrambled{width:100%;max-width:360px}.case svg.reference{width:90px}.face-labels{margin:4px 0 0;color:var(--muted)}.details{margin:0;padding-left:1.2rem}.reference-block figcaption{color:var(--muted);font-size:.9rem}.reference-alg{color:var(--fg)}.solution{font:600 clamp(1.05rem,4.2vw,1.4rem)/1.6 ui-monospace,"SF Mono",Menlo,monospace;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:14px 16px;margin:0 0 16px;overflow-wrap:anywhere}.solution[hidden]{display:none}