:root{--blue:#13695b;--lavender:#e0efeb;--mint:#e8f5ec;--bg:#f2f7f6;--ink:#203d39;--muted:#4f6862;--line:#cddfd9}.subtitle{display:block;margin-top:7px}.brand-symbol{background:#13695b;font-family:"Trebuchet MS",sans-serif}.input-options{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:22px}.upload{display:block;background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;margin:0;text-align:left;cursor:pointer}.upload strong{display:block;font-size:18px}.upload span{display:block;color:var(--muted);font-size:12px;margin-top:8px}.upload input{font-size:11px;margin-top:20px;padding:8px;max-width:100%}#media{margin-bottom:22px}#media img{max-width:100%;max-height:260px;object-fit:contain}#media audio{max-width:100%}fieldset{border:0;padding:0;margin:0 0 25px}legend{font-weight:700;margin-bottom:16px}.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.mode-choice{position:relative;border:1px solid var(--line);border-radius:12px;padding:16px;margin:0;display:flex;gap:12px;align-items:flex-start}.mode-choice input{width:17px;min-width:17px;margin:4px 0}.mode-choice:has(input:checked){border-color:var(--blue);background:var(--mint)}.mode-choice small{display:block;color:var(--muted);font-weight:400;margin-top:5px}.note{margin-top:22px}.coach-bubble{font-size:20px;line-height:1.55;margin:24px 0;background:#fff8dc;padding:23px;border-radius:4px 20px 20px 20px}.hint-bubble{background:var(--mint);padding:18px;margin:15px 0;border-radius:12px}.stage-line{display:flex;gap:5px;margin-bottom:24px}.stage-line span{flex:1;height:6px;border-radius:5px;background:#d6e4df}.stage-line .done{background:var(--blue)}.lesson-actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px}.answer-form{display:flex;gap:10px;align-items:end}.answer-form label{flex:1;margin:0}.answer-form button{height:47px}.attempt{padding:10px 0;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.attempt small{display:block;color:var(--muted)}.blocks{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}.blocks span{min-height:42px;border:2px dashed #509185;border-radius:8px;display:grid;place-items:center;font-size:12px}.rail nav button[aria-current=page]{color:var(--ink)}.eyebrow{color:var(--blue)}
@media(max-width:760px){.input-options{grid-template-columns:1fr;gap:10px}.upload{padding:15px}.upload input{margin-top:10px}.mode-grid{grid-template-columns:1fr}.coach-bubble{font-size:18px;padding:18px}.answer-form{align-items:stretch;flex-direction:column}.answer-form button{height:auto}.lesson-actions button{flex:1;font-size:12px}.rail nav button{min-height:53px}}