.notebook-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:16px}.filter-panel{padding:12px}.filter-title{font-size:11px;color:var(--muted);font-weight:800;margin:5px 5px 8px}.filter-btn{border:0;background:transparent;border-radius:10px;padding:9px 10px;width:100%;text-align:left;display:flex;justify-content:space-between;gap:8px;cursor:pointer}.filter-btn.active{background:var(--accent-2);color:#5548d6;font-weight:800}.filter-btn span:last-child{font-size:11px;color:var(--muted)}
.problem-table{width:100%;border-collapse:collapse}.problem-table th,.problem-table td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}.problem-table th{font-size:11px;color:var(--muted);font-weight:750;background:#fbfbfd}.problem-table td{font-size:13px}.problem-table tbody tr{cursor:pointer}.problem-table tbody tr:hover{background:#fbfbfe}.problem-title-cell strong{display:block}.problem-title-cell small{display:block;color:var(--muted);font-size:11px;margin-top:3px}.mastery{display:inline-flex;align-items:center;gap:7px}.mastery-dot{width:8px;height:8px;border-radius:50%;background:var(--accent)}
.paper{margin:15px;border:1px solid #dfe2eb;border-radius:14px;min-height:500px;background:#fff;position:relative;overflow:hidden}.paper-inner{padding:28px 32px 70px;position:relative;z-index:1}.problem-text{font-size:16px;line-height:1.8}.scan-photo{display:block;width:100%;max-height:680px;object-fit:contain;background:#fafafa}.scan-text{padding:11px 14px;border-top:1px solid var(--line);color:var(--muted);font-size:12px;line-height:1.6}.canvas-layer{position:absolute;inset:0;width:100%;height:100%;z-index:6;touch-action:none;cursor:crosshair}.paper-toolbar{position:absolute;left:12px;right:12px;bottom:11px;z-index:10;display:flex;justify-content:space-between;gap:8px;pointer-events:none}.toolset{display:flex;gap:4px;padding:5px;border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,.95);box-shadow:0 8px 24px rgba(25,29,50,.08);pointer-events:auto;overflow:auto}.tool{border:0;background:transparent;border-radius:8px;min-width:34px;height:34px;padding:0 9px;cursor:pointer;white-space:nowrap}.tool.active{background:var(--accent-2);color:var(--accent)}.ai-overlay-note{position:absolute;z-index:7;max-width:180px;background:rgba(255,255,255,.94);border:1px solid #cfc9ff;color:#5d4cd9;border-radius:10px;padding:7px 9px;font-family:var(--hand);font-size:15px;box-shadow:0 8px 25px rgba(54,48,130,.12);pointer-events:none;animation:inkIn .7s ease both}.ai-overlay-note:before{content:"✦";font-family:system-ui;font-size:10px;margin-right:4px}.paper-demo{padding:32px 38px 80px;min-height:500px}.paper-demo h4{font-size:18px;margin:0 0 14px;line-height:1.6}.paper-demo .options{display:grid;gap:9px;margin-top:20px}.paper-option{padding:11px 12px;border:1px solid var(--line);border-radius:10px}.paper-option.student{border-color:#a9a0ff;background:#f8f7ff}.hand-note{font-family:var(--hand);font-size:18px;color:#2f60cf;transform:rotate(-1deg);margin:16px 0}
.recognition{padding:15px}.recognition-row{padding:11px 0;border-bottom:1px solid var(--line)}.recognition-row:last-child{border-bottom:0}.recognition-label{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:9px;font-size:12px}.confidence{font-size:11px;color:var(--muted)}.chips{display:flex;gap:6px;flex-wrap:wrap}.chip{min-width:38px;height:38px;border:1px solid var(--line);border-radius:9px;background:#fff;display:grid;place-items:center;font-weight:800;cursor:pointer}.chip.on{background:var(--green);border-color:var(--green);color:#fff}.chip.student.on{background:var(--accent);border-color:var(--accent);color:#fff}.confirm-box{padding:0 15px 15px}.confirm-box .primary-btn{width:100%}
.correction-list{padding:2px 15px 15px}.statement{display:grid;grid-template-columns:28px minmax(0,1fr) auto;gap:9px;padding:13px 0;border-bottom:1px solid var(--line);align-items:start}.statement:last-child{border-bottom:0}.statement-label{width:24px;height:24px;border-radius:50%;display:grid;place-items:center;font-size:11px;font-weight:900}.statement-label.good{background:var(--green-bg);color:var(--green)}.statement-label.bad{background:var(--red-bg);color:var(--red)}.statement .original{font-size:12px;color:var(--muted);margin-bottom:6px;line-height:1.45}.corrected-input{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 11px;background:#fff;outline:0}.corrected-input:focus{border-color:#aaa2ff;box-shadow:0 0 0 3px #f0eeff}.truth-label{display:inline-flex;align-items:center;gap:4px;background:var(--green-bg);color:var(--green);border-radius:7px;padding:4px 7px;font-size:10px;font-weight:850;margin-top:6px}.statement-actions{display:grid;gap:6px}.statement-actions button{padding:7px 9px;font-size:11px}
.insight-box{padding:15px}.insight-box textarea{width:100%;min-height:95px;border:1px solid var(--line);border-radius:11px;padding:11px;resize:vertical;outline:0}.insight-box textarea:focus{border-color:#aaa2ff;box-shadow:0 0 0 3px #f0eeff}.insight-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:8px}
.mapping{padding:14px 15px}.concept-code{font-size:10px;color:#5d4cd7;background:var(--accent-2);display:inline-flex;padding:4px 7px;border-radius:7px;font-weight:800}.concept-name{font-size:18px;font-weight:850;margin:8px 0 2px}.mapping-row{display:grid;grid-template-columns:82px 1fr;gap:10px;padding:9px 0;border-top:1px solid var(--line);font-size:12px;align-items:center}.mapping-row:first-of-type{margin-top:10px}.publisher{display:inline-flex;width:max-content;padding:5px 7px;border-radius:7px;background:var(--surface-2);font-weight:800}.mapping-unknown{color:var(--amber)}
.tutor{padding:15px}.tutor-answer{border:1px solid var(--line);border-radius:12px;padding:13px;background:#fff;line-height:1.65}.tutor-steps{display:grid;gap:9px;margin-top:10px}.tutor-step{display:flex;gap:8px}.step-no{width:22px;height:22px;flex:0 0 auto;border-radius:50%;background:var(--accent-2);color:var(--accent);display:grid;place-items:center;font-size:11px;font-weight:900}.tutor-input{display:grid;grid-template-columns:1fr auto;gap:7px;margin-top:11px}.tutor-input input{border:1px solid var(--line);border-radius:10px;padding:10px 11px;outline:0}.tutor-input input:focus{border-color:#aaa2ff;box-shadow:0 0 0 3px #f0eeff}
.chapter-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:16px}.chapter-tree{padding:10px}.chapter-subject{font-size:13px;font-weight:850;padding:10px 9px}.chapter-node{border:0;background:transparent;width:100%;border-radius:9px;padding:9px 10px;text-align:left;cursor:pointer;font-size:12px;color:#4f5461}.chapter-node:hover{background:#f5f5fb}.chapter-node.active{background:var(--accent-2);color:#5548d7;font-weight:800}.concept-detail{padding:20px}.concept-detail h2{font-size:25px;margin:8px 0 4px}.concept-summary{color:var(--muted);line-height:1.65}.concept-metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin:16px 0}.metric{background:var(--surface-2);border-radius:12px;padding:12px}.metric strong{font-size:19px;display:block}.metric span{font-size:10px;color:var(--muted)}.truths{margin-top:16px}.truth{border:1px solid #d5eadf;background:#fbfffd;border-radius:10px;padding:10px 11px;margin:8px 0;font-size:12px;line-height:1.55;color:#226e4f}