:root{--bg:#f6f8fb;--panel:#fff;--text:#111827;--muted:#6b7280;--accent:#4f46e5;--accent-hover:#6366f1;--border:#e5e7eb;--radius:14px;--shadow:0 8px 24px #0f172a0f;--danger:#b91c1c;--danger-bg:#fef2f2}*{box-sizing:border-box}html,body,#root{height:100%}body{color:var(--text);background:var(--bg);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.shell{max-width:960px;min-height:100%;margin:0 auto;padding:28px 20px 40px}.shell.narrow{max-width:420px}.title{margin:0 0 8px;font-size:1.5rem;font-weight:700}.muted{color:var(--muted);margin:0 0 20px}.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.form-card label{margin-bottom:14px;font-size:.9rem;font-weight:600;display:block}.form-card input,.form-card select{border:1px solid var(--border);width:100%;font:inherit;background:var(--panel);color:var(--text);border-radius:10px;margin-top:6px;padding:10px 12px;display:block}.auth-tabs{border:1px solid var(--border);background:var(--panel);border-radius:10px;gap:0;margin-bottom:16px;display:flex;overflow:hidden}.auth-tab{font:inherit;cursor:pointer;color:var(--muted);background:0 0;border:none;flex:1;padding:10px 12px;font-weight:600}.auth-tab.active{background:var(--accent);color:#fff}.role-pill{color:#4338ca;text-transform:capitalize;background:#eef2ff;border-radius:999px;padding:2px 8px;font-size:.8rem;font-weight:600;display:inline-block}.class-panel{padding:16px 18px}.class-panel-row{margin-bottom:12px}.class-panel-row .btn.secondary{width:auto;min-width:160px}.class-picker{margin:0;font-size:.9rem;font-weight:600;display:block}.class-picker-label{color:var(--muted);margin-bottom:6px;font-size:.85rem;font-weight:600;display:block}.class-picker select{border:1px solid var(--border);width:100%;max-width:420px;font:inherit;background:var(--panel);color:var(--text);border-radius:10px;padding:10px 12px;display:block}.teacher-class-card{margin-bottom:16px;padding:16px 18px}.teacher-class-roster{border-top:1px solid var(--border);margin-top:14px;padding-top:14px}.roster-title{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;font-size:.85rem;font-weight:700}.roster-table{margin:10px 0 0;padding:0;list-style:none}.roster-table li{border-bottom:1px solid var(--border);grid-template-columns:minmax(100px,1fr) auto auto;align-items:baseline;gap:10px 16px;padding:8px 0;font-size:.9rem;display:grid}.roster-table li:last-child{border-bottom:none}.roster-uid{font-family:ui-monospace,monospace;font-size:.85rem}.roster-meta{color:var(--muted);white-space:nowrap;font-size:.82rem}@media (width<=640px){.roster-table li{grid-template-columns:1fr;gap:4px}}.teacher-class-card-title-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;display:flex}.class-panel-actions{flex-wrap:wrap;gap:10px;display:flex}.class-panel-actions .btn.secondary{width:auto;min-width:140px}.progress-dashboard .progress-h2{margin:20px 0 10px;font-size:1.05rem}.progress-summary-card{margin-bottom:24px;padding:18px 20px}.progress-summary-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.progress-summary-body{white-space:pre-wrap;margin-top:14px;font-size:.95rem;line-height:1.55}.smallprint{margin:8px 0 0;font-size:.8rem}.table-wrap{border:1px solid var(--border);border-radius:var(--radius);background:var(--panel);overflow-x:auto}.progress-table{border-collapse:collapse;width:100%;font-size:.88rem}.progress-table th,.progress-table td{text-align:left;border-bottom:1px solid var(--border);vertical-align:top;padding:10px 12px}.progress-table th{background:var(--bg);color:var(--muted);text-transform:uppercase;letter-spacing:.04em;font-size:.78rem;font-weight:700}.progress-table tr:last-child td{border-bottom:none}.progress-feedback,.progress-notes{max-width:280px}.roster-click-table .btn.secondary{font-size:.85rem}.progress-lesson-block{margin-bottom:28px}.progress-teacher-by-question{padding:18px 20px}.progress-teacher-by-question-hint{margin:0 0 14px}.progress-table-teacher-questions .progress-when-sub{margin-top:4px;line-height:1.35}.progress-teacher-details-cell{vertical-align:top;min-width:7rem}.progress-details-summary{cursor:pointer;color:var(--accent);font-size:.85rem;font-weight:600;list-style:none}.progress-details-summary::-webkit-details-marker{display:none}.progress-details-summary:before{content:"▸ ";transition:transform .12s;display:inline-block}details[open]>.progress-details-summary:before{transform:rotate(90deg)}.progress-details-panel{border-top:1px solid var(--border);margin-top:12px;padding:12px 0 4px}.progress-details-lead{margin:0 0 10px}.progress-details-inner-wrap{margin-bottom:14px}.progress-table-nested{font-size:.82rem}.progress-table-nested th,.progress-table-nested td{padding:8px 10px}.progress-attempt-text-block{background:var(--bg);border-left:3px solid var(--border);border-radius:8px;margin:0 0 16px;padding:10px 12px}.progress-attempt-text-head{margin-bottom:8px}.progress-attempt-feedback{white-space:pre-wrap;font-size:.88rem;line-height:1.5}.progress-attempt-notes{margin:8px 0 0;padding-left:1.1rem;font-size:.85rem;line-height:1.45}.progress-teacher-feedback-card{margin-bottom:28px}.btn{font:inherit;cursor:pointer;border:1px solid #0000;border-radius:10px;justify-content:center;align-items:center;padding:10px 18px;font-weight:600;display:inline-flex}.btn:disabled{opacity:.55;cursor:not-allowed}.btn.primary{background:var(--accent);color:#fff;width:100%;margin-top:8px}.btn.primary:hover:not(:disabled){background:var(--accent-hover)}.btn.secondary{background:var(--panel);width:100%;color:var(--text);border-color:var(--border)}.btn.secondary:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.btn.ghost{color:var(--muted);background:0 0;border-color:#0000}.btn.ghost:hover:not(:disabled){color:var(--accent)}.divider{text-align:center;color:var(--muted);margin:16px 0;font-size:.85rem}.hint{color:var(--muted);margin-top:20px;font-size:.8rem}.error{color:var(--danger);margin:0 0 8px;font-size:.9rem}.menu-shell{max-width:900px}.class-dashboard-shell{max-width:1120px}.class-dashboard-hint{margin-top:10px}.class-student-roster-card{margin-top:8px}.class-student-roster{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.class-student-row{border:1px solid var(--border);border-radius:var(--radius);background:var(--panel);color:inherit;flex-wrap:wrap;align-items:center;gap:16px;padding:14px 16px;text-decoration:none;transition:border-color .15s,background .15s;display:flex}.class-student-row:hover{border-color:var(--accent);background:var(--bg)}.class-student-row-main{flex-direction:column;flex:1;gap:4px;min-width:0;display:flex}.class-student-label{text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-size:.72rem;font-weight:700}.class-student-uid{color:var(--text);font-size:1rem;font-weight:600}.class-student-meta{color:var(--muted);font-size:.88rem}.class-student-chevron{color:var(--accent);font-size:1.25rem;font-weight:700}.progress-lesson-pick-card{margin-bottom:20px}.progress-teacher-prompt{border-radius:var(--radius);background:var(--bg);border:1px dashed var(--border);margin:0 0 20px;padding:14px 16px}.class-lesson-select-label{color:var(--text);margin-bottom:6px;font-size:.9rem;font-weight:600;display:block}.class-lesson-select{border:1px solid var(--border);background:var(--panel);width:100%;max-width:440px;color:var(--text);border-radius:10px;padding:10px 12px;font-size:1rem;display:block}.progress-h3{color:var(--text);margin:0;font-size:1.1rem;font-weight:700}.progress-question-label{font-weight:600}.roster-progress-links{flex-wrap:wrap;align-items:center;gap:10px 14px;display:flex}.roster-all-lessons-link{white-space:nowrap}.menu-header{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:24px;display:flex}.lesson-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;display:grid}.lesson-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);color:inherit;flex-direction:column;gap:8px;padding:18px;text-decoration:none;transition:border-color .15s,transform .15s;display:flex}.lesson-card:hover{border-color:var(--accent);text-decoration:none;transform:translateY(-2px)}.lesson-card-title{font-size:1rem;font-weight:700}.lesson-card-meta{color:var(--muted);font-size:.85rem}.lesson-page{background:#0f172a;flex-direction:column;height:100%;min-height:100vh;display:flex}.lesson-toolbar{background:var(--bg);border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;gap:12px;padding:10px 14px;display:flex}.lesson-toolbar-title{color:var(--text);text-overflow:ellipsis;white-space:nowrap;font-size:.95rem;font-weight:600;overflow:hidden}.banner{flex-shrink:0;padding:8px 14px;font-size:.88rem}.banner.info{color:#3730a3;background:#eef2ff;border-bottom:1px solid #c7d2fe}.banner.error{background:var(--danger-bg);color:var(--danger);border-bottom:1px solid #fecaca}.lesson-frame{background:#fff;border:0;flex:1;width:100%;min-height:0}.no-margin{margin:0}.section-title{margin-top:28px;font-size:1.1rem}.form-card-narrow{max-width:420px}.form-card-spaced{margin-bottom:1rem}.banner-spaced{margin-bottom:12px}.stacked-btn{margin-top:.5rem}.class-list{margin:0;padding:0}.class-list-item{margin-bottom:12px;list-style:none}.class-panel{margin-bottom:20px}.class-panel-empty{margin:12px 0 0}.join-code{letter-spacing:.06em;font-size:1.05em}.badge-inactive{color:var(--muted);font-size:.85rem;font-weight:500}.teacher-class-card{list-style:none}.teacher-class-card-cta{width:auto;padding:6px 14px;font-size:.85rem}.teacher-class-card-meta{margin-top:6px}.roster-empty{margin:8px 0 0}.teacher-class-ops{flex-direction:column;gap:8px;margin-top:12px;display:flex}.teacher-class-ops-row{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.teacher-class-ops input{border:1px solid var(--border);font:inherit;border-radius:8px;flex:220px;padding:6px 10px}.class-student-li{align-items:center;gap:8px;display:flex}.class-student-row{flex:1}.rag-pill{border:1px solid var(--border);background:var(--bg);min-width:26px;color:var(--muted);border-radius:999px;justify-content:center;align-items:center;padding:2px 8px;font-size:.78rem;font-weight:700;display:inline-flex}.rag-pill.rag-green{color:#15803d;background:#dcfce7;border-color:#86efac}.rag-pill.rag-amber{color:#b45309;background:#fef3c7;border-color:#fcd34d}.rag-pill.rag-red{color:#b91c1c;background:#fee2e2;border-color:#fca5a5}.class-roster-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.class-roster-controls{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.class-roster-filter{border:1px solid var(--border);font:inherit;border-radius:10px;padding:7px 10px}.class-roster-rag-filter{align-items:center;gap:6px;display:inline-flex}.class-roster-rag-filter select{border:1px solid var(--border);font:inherit;border-radius:10px;padding:7px 8px}.class-roster-hint{margin-top:4px}.roster-sort-btn{font:inherit;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);cursor:pointer;background:0 0;border:none;margin:0;padding:0;font-size:.78rem;font-weight:700}.roster-sort-btn[aria-pressed=true]{color:var(--accent)}.roster-student-link{word-break:break-all;font-weight:600}.roster-lesson-strip{flex-wrap:wrap;gap:4px;max-width:220px;display:inline-flex}.roster-dot{background:#d1d5db;border-radius:50%;width:11px;height:11px;display:inline-block}.roster-dot.dot-green,.student-lesson-chip.chip-green .chip-tag{background:#16a34a}.roster-dot.dot-amber{background:#d97706}.roster-dot.dot-red{background:#dc2626}.roster-dot.dot-none{background:#e5e7eb}.class-lesson-stats{flex-wrap:wrap;align-items:center;gap:24px;margin:14px 0 6px;display:flex}.class-lesson-stat{flex-direction:column;display:flex}.class-lesson-stat-num{font-size:1.6rem;font-weight:800;line-height:1.1}.class-lesson-rag-dist{gap:6px;display:inline-flex}.class-lesson-subhead{margin:16px 0 8px;font-size:.95rem;font-weight:700}.class-lesson-qlist{flex-direction:column;gap:4px;margin:0;padding:0;list-style:none;display:flex}.class-lesson-qrow{border-bottom:1px solid var(--border);justify-content:space-between;gap:12px;padding:6px 0;display:flex}.class-lesson-qrow:last-child{border-bottom:none}.class-lesson-qtitle{font-size:.9rem}.class-lesson-feedback{border-top:1px solid var(--border);margin-top:14px;padding-top:12px}.class-lesson-empty{margin-top:14px}.student-score-header .student-score-top{flex-wrap:wrap;align-items:baseline;gap:12px;display:flex}.student-score-overall{align-items:center;gap:8px;display:inline-flex}.student-score-num{font-size:1.8rem;font-weight:800;line-height:1}.student-score-strip{flex-wrap:wrap;gap:8px;margin-top:14px;display:flex}.student-lesson-chip{border:1px solid var(--border);background:var(--bg);border-radius:10px;align-items:center;gap:6px;padding:4px 8px;font-size:.8rem;display:inline-flex}.student-lesson-chip .chip-tag{color:#fff;background:#9ca3af;border-radius:6px;padding:1px 6px;font-size:.72rem;font-weight:700}.student-lesson-chip.chip-amber .chip-tag{background:#d97706}.student-lesson-chip.chip-red .chip-tag{background:#dc2626}.student-lesson-chip.chip-none{opacity:.65}.chip-pct{font-weight:600}.class-manage-card .class-manage-panel{margin-top:12px}.class-roster-lesson-pick{align-items:center;gap:6px;display:inline-flex}.class-roster-lesson-pick select{border:1px solid var(--border);font:inherit;border-radius:10px;max-width:240px;padding:7px 8px}.roster-dot.dot-selected{outline:2px solid var(--accent);outline-offset:1px}._trailWrap_1ug2u_9{width:100%;margin-top:4px;position:relative}._board_1ug2u_16{z-index:0;pointer-events:none;width:100%;height:100%;position:absolute;inset:0;overflow:visible}._trace_1ug2u_26{fill:none;stroke:#6366f1;stroke-width:4px;stroke-linecap:round;stroke-linejoin:round}._pad_1ug2u_34{fill:#f59e0b;stroke:#fff;stroke-width:1.5px}._cardItem_1ug2u_41{z-index:2;position:absolute}._cardTitle_1ug2u_47{-webkit-line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}._mascot_1ug2u_55{z-index:1;pointer-events:none;opacity:.95;position:absolute}@media (prefers-reduced-motion:no-preference){._mascot_1ug2u_55{animation:_bob_1ug2u_1 var(--dur,7s) ease-in-out infinite;animation-delay:var(--delay,0s)}@keyframes _bob_1ug2u_1{0%,to{transform:translateY(0) rotate(var(--rot,0deg))}50%{transform:translateY(-7px) rotate(calc(var(--rot,0deg) + 1.5deg))}}._cursor_1ug2u_79{animation:1.1s step-end infinite _blink_1ug2u_1}@keyframes _blink_1ug2u_1{0%,50%{opacity:1}50.01%,to{opacity:0}}}