:root{--ink:#183733;--muted:#5c706c;--teal:#21695f;--dark:#164e4a;--line:#d7e3dc;--paper:#fffefa;--bg:#f3f5ef;--accent:#e3edbd;--red:#9c3232}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font:17px/1.55 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,a,input{touch-action:manipulation}button,a{ -webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;border-radius:12px;border:1px solid var(--line);padding:13px 20px;background:white;color:var(--ink);font-weight:650;min-height:48px}button:hover{border-color:var(--teal);background:#eff5ed}button:disabled{opacity:.5;cursor:default}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid #ce982d;outline-offset:4px}a{color:var(--dark)}.primary{color:#fff;background:var(--dark);border-color:var(--dark)}.primary:hover{background:#21695f;color:white}.danger{color:var(--red)}.topbar{max-width:1140px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:25px 30px;border-bottom:1px solid var(--line)}#brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:20px;line-height:1.3}.brand-icon{display:grid;place-items:center;background:var(--dark);color:var(--accent);width:42px;height:42px;border-radius:12px;font-size:25px}#brand small{display:block;font-size:9px;letter-spacing:1.6px;margin-top:4px;color:var(--muted)}.edition,.eyebrow{font-size:12px;letter-spacing:1.8px;font-weight:750;color:var(--teal)}main{max-width:1000px;margin:auto;padding:48px 28px 20px;min-height:65vh}h1{font-size:clamp(30px,5vw,48px);line-height:1.12;letter-spacing:-1.5px;margin:12px 0 18px;font-weight:650}h2{font-size:25px;line-height:1.3;margin:0 0 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0;font-weight:400;line-height:1.45;background:transparent}.letter{width:29px;height:29px;display:inline-grid;place-items:center;border:1px solid #bacbc2;border-radius:8px;flex-shrink:0;font-size:14px;font-weight:700}.option.selected{border-color:var(--teal);background:#eaf1e6;box-shadow:inset 0 0 0 1px var(--teal)}.option.selected .letter{background:var(--dark);color:white;border-color:var(--dark)}.option.good{border-color:#43845c;background:#eaf4e9}.option.bad{border-color:#be6d65;background:#fbefec}.option:disabled{opacity:1;cursor:default}.feedback{margin-top:22px;border-top:1px solid var(--line);padding-top:20px;font-size:16px}.feedback strong{color:var(--teal)}.feedback.incorrect strong{color:var(--red)}.ref{display:block;font-size:13px;color:var(--muted);margin-top:10px}.quiz-nav{display:flex;gap:10px;justify-content:space-between;margin:20px 0}.quiz-nav button{min-width:100px}.utility{display:flex;gap:10px;justify-content:space-between;align-items:center;margin:18px 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