:root{color-scheme:light;--navy:#10233f;--ink:#172033;--muted:#5c6678;--line:#dce1e8;--paper:#fff;--bg:#eef2f6;--gold:#b9872f;--danger:#a12828;--success:#17633a;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-size:16px;line-height:1.55}.topbar{height:68px;background:var(--navy);color:white;display:flex;align-items:center;gap:12px;padding:0 max(20px,calc((100vw - 980px)/2));letter-spacing:.04em}.mark{display:grid;place-items:center;width:36px;height:36px;border:2px solid var(--gold);border-radius:9px;font:700 1.25rem Georgia,serif}.topbar .link{margin-left:auto;color:white}main{width:min(920px,calc(100% - 32px));margin:clamp(28px,7vw,72px) auto}.card{background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:0 14px 40px rgba(16,35,63,.08);padding:clamp(22px,5vw,42px)}.login-card{max-width:560px;margin:auto}h1,h2{font-family:Georgia,"Times New Roman",serif;line-height:1.15;color:var(--navy)}h1{font-size:clamp(2rem,7vw,3.35rem);margin:.35rem 0 1rem}h2{font-size:clamp(1.4rem,4vw,2rem);margin:.65rem 0 1.25rem}.eyebrow{font-weight:800;font-size:.78rem;letter-spacing:.13em;color:#6f511b;margin:0}.muted{color:var(--muted)}form,label{display:grid;gap:7px}form{gap:18px;margin-top:30px}label{font-weight:700}input,textarea{width:100%;border:1px solid #aeb8c7;border-radius:10px;padding:13px 14px;font:inherit;color:var(--ink);background:white}input:focus,textarea:focus,button:focus-visible{outline:3px solid rgba(38,109,176,.35);outline-offset:2px;border-color:#266db0}.primary{border:0;border-radius:10px;background:var(--navy);color:white;padding:14px 18px;font:700 1rem inherit;cursor:pointer}.primary:hover{background:#17375f}.primary:disabled{opacity:.55;cursor:wait}.link{border:0;background:transparent;text-decoration:underline;font:inherit;cursor:pointer}.error{border-left:4px solid var(--danger);background:#fff1f1;color:#721c1c;padding:12px 14px;margin-top:18px}.hidden{display:none!important}.learning-shell{max-width:760px;margin:auto}.context{margin-bottom:18px}.source{border-left:4px solid var(--gold);background:#f6f2e9;padding:16px 18px;margin:22px 0;font-family:Georgia,"Times New Roman",serif}.prompt{font-size:1.22rem;font-weight:750}.options{display:grid;gap:11px;margin:22px 0}.option{display:flex;grid-template-columns:none;align-items:flex-start;gap:12px;border:1px solid var(--line);border-radius:11px;padding:13px;font-weight:500;cursor:pointer}.option:has(input:checked){border-color:#266db0;background:#eef6ff}.option input{width:auto;margin-top:5px}.confidence{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0 24px}.confidence label{display:flex;align-items:center;gap:7px;border:1px solid var(--line);padding:9px 12px;border-radius:99px;font-weight:500}.confidence input{width:auto}.lesson{background:#eff5fb;border-left:4px solid #266db0;padding:16px 18px;margin:18px 0}.compare{display:grid;grid-template-columns:1fr 1fr;gap:12px}.example{border:1px solid var(--line);border-radius:11px;padding:14px}.feedback{border-left:4px solid var(--success);background:#eff9f2;padding:17px 19px;margin-top:20px}.feedback.wrong{border-color:var(--gold);background:#fff8e9}.row{display:flex;justify-content:space-between;align-items:center;gap:14px}.spinner{width:28px;height:28px;border:3px solid var(--line);border-top-color:var(--navy);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}footer{max-width:920px;margin:40px auto;padding:0 20px 30px;text-align:center;color:var(--muted);font-size:.9rem}@media(max-width:580px){.compare{grid-template-columns:1fr}.topbar strong{font-size:.88rem}.card{border-radius:14px}.confidence{display:grid}.confidence label{border-radius:10px}}
@media(prefers-reduced-motion:reduce){.spinner{animation:none}}

select{width:100%;border:1px solid #aeb8c7;border-radius:10px;padding:13px 14px;font:inherit;color:var(--ink);background:white}
select:focus{outline:3px solid rgba(38,109,176,.35);outline-offset:2px;border-color:#266db0}
.secondary,.small-action{border:1px solid #8d9aab;border-radius:9px;background:white;color:var(--navy);font:700 .93rem inherit;cursor:pointer}
.secondary{padding:11px 15px}.small-action{padding:7px 10px;white-space:nowrap}.secondary:hover,.small-action:hover{background:#f1f4f8}
.wrap{flex-wrap:wrap}.teacher-shell{width:min(1180px,calc(100% - 32px));margin:28px auto 64px}.teacher-grid{display:grid;grid-template-columns:minmax(280px,.8fr) minmax(0,1.8fr);gap:20px;align-items:start}.teacher-stack{display:grid;gap:20px}.compact-form{margin-top:18px;gap:14px}.stats{display:grid;grid-template-columns:repeat(3,minmax(110px,1fr));gap:12px;margin:22px 0}.stat{border:1px solid var(--line);border-radius:12px;padding:15px;background:#f8fafc}.stat strong{display:block;font-size:1.55rem;color:var(--navy)}.stat span{font-size:.86rem;color:var(--muted)}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:12px}table{width:100%;border-collapse:collapse;min-width:680px}th,td{padding:12px 13px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}th{background:#f5f7fa;color:#465166;font-size:.8rem;letter-spacing:.04em;text-transform:uppercase}tbody tr:last-child td{border-bottom:0}.actions{display:flex;gap:7px;flex-wrap:wrap}.pill{display:inline-block;padding:3px 8px;border-radius:99px;font-size:.78rem;font-weight:750;background:#e8eef6;color:#30445f}.pill.open{background:#fff1d8;color:#72511b}.pill.paused{background:#f5e7e7;color:#7b2525}.result{border-left:4px solid var(--success);background:#eff9f2;padding:12px 14px;margin-top:16px;overflow-wrap:anywhere}
@media(max-width:820px){.teacher-grid{grid-template-columns:1fr}.stats{grid-template-columns:1fr 1fr 1fr}}
@media(max-width:580px){.stats{grid-template-columns:1fr}.teacher-shell{width:min(100% - 20px,1180px)}.row{align-items:flex-start}.topbar{padding-inline:14px}.topbar .link{font-size:.84rem}}