:root{--ink:#173848;--muted:#607985;--teal:#2c858d;--teal2:#51b1ae;--line:#cfe1e4;--paper:#fff;--bg:#eef5f5;--gold:#c78d34;--ok:#2f8b66;--bad:#c45a58}*{box-sizing:border-box}body{margin:0;background:linear-gradient(#edf5f5,#e8f0f0);font-family:Arial,Helvetica,sans-serif;color:var(--ink)}.shell{max-width:1100px;margin:auto;padding:12px}header{position:sticky;top:8px;z-index:20;display:flex;align-items:center;gap:12px;padding:12px 16px;background:rgba(255,255,255,.95);border:1px solid var(--line);border-radius:20px;box-shadow:0 10px 30px rgba(20,55,70,.1)}header small{display:block;color:var(--muted)}.badge{background:var(--gold);color:#fff;font-weight:800;padding:8px 12px;border-radius:10px}.topright{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}.topright span{border:1px solid var(--line);padding:7px 10px;border-radius:999px;background:#f9fcfc;color:var(--muted);font-size:.88rem}main{padding:14px 0}.card{background:var(--paper);border:1px solid var(--line);border-radius:28px;box-shadow:0 14px 38px rgba(20,55,70,.1);padding:26px}.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:24px;align-items:center}.hero img,.lesson-img{width:100%;border-radius:22px;border:1px solid var(--line)}h1{font-size:2.8rem;line-height:1.06;margin:.15em 0}.lead{font-size:1.12rem;line-height:1.7;color:var(--muted)}.pill{display:inline-block;background:#ece7ff;color:#5746a4;font-size:.82rem;font-weight:800;border-radius:999px;padding:7px 10px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}.mini{border:1px solid var(--line);background:#fbfefe;border-radius:18px;padding:15px}.mini h3{margin-top:0}.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.btn{border:none;border-radius:14px;padding:12px 17px;font-weight:800;cursor:pointer}.primary{background:linear-gradient(135deg,var(--teal),var(--teal2));color:#fff}.secondary{background:#f3f8f8;color:var(--ink);border:1px solid var(--line)}.ghost{background:#fff;color:var(--muted);border:1px dashed var(--line)}input,select,textarea{width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:14px;background:#fbfefe;font:inherit;color:var(--ink)}label{font-weight:700}.field{display:flex;flex-direction:column;gap:7px}.formgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:18px 0}.full{grid-column:1/-1}.note{background:#fffaf0;border:1px solid #eadbb8;padding:14px 16px;border-radius:16px;line-height:1.65}.slidehead h1{font-size:2.35rem}.slidehead p{color:var(--muted);font-size:1.05rem;line-height:1.65}.challenge{border:1px solid var(--line);border-radius:20px;padding:18px;background:#fbfefe}.options{display:grid;gap:10px}.option{display:grid;grid-template-columns:32px minmax(0,1fr);gap:10px;align-items:start;border:1px solid var(--line);padding:13px;border-radius:16px;background:#fff;cursor:pointer}.option.sel{background:#eaf8f8;border-color:var(--teal)}.letter{width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:#edf5f5;font-weight:800}.feedback{margin-top:12px;border-radius:16px;padding:13px;background:#f5fbf8;border:1px solid #cce6d7}.feedback.bad{background:#fff6f6;border-color:#efcaca}.reveal{margin-top:12px;background:#f8fcfc;border:1px solid var(--line);border-radius:16px;padding:14px}.writebox textarea{min-height:130px;line-height:1.65}.scorebox{display:grid;grid-template-columns:1fr 320px;gap:16px}.identity{border:1px solid var(--line);border-radius:20px;padding:18px;background:#fbfefe}.identitygrid{display:grid;grid-template-columns:140px 1fr;gap:9px 14px}.identitygrid span{color:var(--muted);font-weight:700}.bigscore{border-radius:24px;background:linear-gradient(135deg,var(--teal),var(--teal2));color:#fff;display:grid;place-items:center;text-align:center;min-height:250px}.bigscore strong{display:block;font-size:4rem}.status{margin-top:14px;border:1px solid var(--line);border-radius:18px;padding:15px}.ok{background:#f4fbf8;border-color:#cde8d7}.badstatus{background:#fff6f6;border-color:#efcccc}footer{text-align:center;color:var(--muted);padding:18px 8px 28px}.hidden{display:none}@media(max-width:820px){.hero,.grid2,.scorebox{grid-template-columns:1fr}.formgrid{grid-template-columns:1fr}.full{grid-column:auto}h1{font-size:2.1rem}.identitygrid{grid-template-columns:1fr}}@media(max-width:560px){.shell{padding:7px}.card{padding:18px}.slidehead h1{font-size:1.8rem}.option{grid-template-columns:28px minmax(0,1fr);padding:11px}.topright{display:none}}