:root{--ink:#243044;--muted:#637083;--blue:#246bce;--blue2:#eaf3ff;--green:#16845b;--red:#c54545;--line:#d8e0ea;--paper:#fff;--bg:#f5f8fc;--radius:16px;font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);min-width:320px}.topbar{height:64px;background:var(--paper);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 max(16px,calc((100% - 960px)/2));position:sticky;top:0;z-index:2}.brand{font-weight:800;color:var(--blue);text-decoration:none;font-size:1.15rem}.xp{font-weight:700;color:var(--green)}main{max-width:960px;margin:0 auto;padding:24px 16px 88px}.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:16px;box-shadow:0 2px 10px #2430440b}.hero{text-align:center;padding:34px 20px}.hero h1{font-size:clamp(1.7rem,5vw,2.6rem);margin:0 0 8px}.hero p{color:var(--muted)}.choice-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.choice-grid.skills{grid-template-columns:repeat(4,1fr)}button,.button{font:inherit;min-height:44px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);cursor:pointer;padding:10px 14px;font-weight:700}.choice[aria-pressed=true],button.primary{background:var(--blue);border-color:var(--blue);color:#fff}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.button.primary{display:inline-flex;align-items:center;justify-content:center;text-decoration:none}.muted{color:var(--muted)}.notice{background:#fff7e1;border:1px solid #f1d38a;border-radius:12px;padding:12px;margin:16px 0}.progressbar{height:10px;border-radius:20px;background:#e6ecf4;overflow:hidden}.progressbar span{display:block;height:100%;background:var(--green)}.activity-head,.progress-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.prompt{font-size:clamp(1.15rem,3vw,1.55rem);font-weight:750;line-height:1.45}.answers{display:grid;gap:10px;margin-top:20px}.answer{text-align:left}.answer.correct{background:#e8f7ef;border-color:var(--green)}.answer.wrong{background:#fff0f0;border-color:var(--red)}.explanation{padding:12px;background:var(--blue2);border-left:4px solid var(--blue);margin-top:14px}.vocab-strip{display:flex;gap:8px;overflow:auto;padding:8px 0;margin-top:20px;border-top:1px solid var(--line)}.vocab-strip button{white-space:nowrap;min-height:44px;color:var(--blue)}.passage{white-space:pre-line;line-height:1.7;background:#f8fafc;border-radius:12px;padding:16px;margin:16px 0}.writing{width:100%;min-height:180px;resize:vertical;border:1px solid var(--line);border-radius:12px;padding:14px;font:inherit}.wordcount{font-weight:700;color:var(--muted)}.item-list{display:grid;gap:8px}.item-row{display:flex;align-items:center;gap:10px;justify-content:space-between;border:1px solid var(--line);border-radius:12px;padding:8px 10px}.status{font-size:.88rem;color:var(--muted)}.status.done{color:var(--green);font-weight:700}.disclaimer{position:fixed;bottom:0;left:0;right:0;background:#1e293b;color:#fff;text-align:center;padding:9px 12px;margin:0;font-size:.82rem;z-index:3}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid #f5ad27;outline-offset:2px}.tooltip{position:fixed;background:#162033;color:#fff;padding:8px 10px;border-radius:8px;font-size:.82rem;z-index:10;max-width:240px;box-shadow:0 4px 14px #0004}.empty{padding:28px;text-align:center;color:var(--muted)}@media(max-width:600px){main{padding:16px 12px 92px}.choice-grid,.choice-grid.skills{grid-template-columns:repeat(2,1fr)}.card{padding:16px}.topbar{padding:0 12px}.item-row{align-items:flex-start}.item-row button{flex-shrink:0}}
.item-row>span:first-child{min-width:0;overflow-wrap:anywhere}