:root{--ink:#243d37;--green:#174d43;--mint:#e3eee5;--paper:#f7f6ef;--line:#dfe5dc;--muted:#64766d;--gold:#d0a13f}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input{font:inherit}button{cursor:pointer;min-height:46px;border:1px solid transparent;border-radius:10px;padding:10px 18px;background:var(--green);color:white;font-weight:650}button:hover{filter:brightness(.94)}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible{outline:3px solid var(--gold);outline-offset:3px}button.secondary{background:var(--mint);color:var(--green)}button.quiet{background:transparent;color:var(--green);border-color:var(--line)}button.text-button{background:transparent;color:var(--muted);padding:6px 0;text-decoration:underline;font-size:14px}header{padding:20px max(5%,calc((100vw - 1200px)/2));display:flex;align-items:center;gap:24px;border-bottom:1px solid 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var(--line);padding:28px;border-radius:18px;color:var(--ink);background:#fffefa}dialog::backdrop{background:#17362c65}.dialog-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:15px}.dialog-heading h2{margin:0}.tool-buttons{display:grid;gap:12px;margin:24px 0}[hidden]{display:none!important}@media(max-width:900px){.workspace{grid-template-columns:210px minmax(0,1fr);gap:16px}aside{padding:20px 14px}.exercise{padding:24px}.header-note{display:none}header{padding:16px 24px;justify-content:space-between}.exercise-footer .small{display:none}}@media(max-width:650px){main{padding:25px 16px}.welcome{align-items:flex-start}.welcome p:last-child{font-size:13px}.reward{min-width:88px;min-height:90px}.workspace{grid-template-columns:1fr}aside{padding:18px}.aside-note{display:none}nav{display:flex;overflow:auto;gap:6px;margin-top:12px;padding-bottom:4px}nav button{min-width:44px;padding:6px;justify-content:center}nav .q-label{display:none}aside 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.workspace > *{min-width:0}nav{max-width:100%}