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#0d948859;transition:all .15s ease}.exercise-browser-add-btn:hover{background:#0f766e;transform:translateY(-1px)}.exercise-browser-backup-btn{display:inline-flex;align-items:center;gap:4px;padding:8px 12px;border:1px solid #cbd5e1;border-radius:8px;background:#f8fafc;color:#475569;font-size:11px;font-weight:600;cursor:pointer;transition:background .15s ease}.exercise-browser-backup-btn:hover{background:#e2e8f0;color:#1e293b}.exercise-browser-close{border:0;background:none;color:#64748b;font-size:28px;line-height:1;cursor:pointer;padding:4px 8px;border-radius:6px;transition:background .15s}.exercise-browser-close:hover{background:#f1f5f9;color:#0f172a}.exercise-browser-filters{display:grid;grid-template-columns:2fr .8fr 1.6fr .9fr 1.1fr .9fr;gap:8px;padding:12px 24px;background:#f8fafc;border-bottom:1px solid #e2e8f0}.exercise-browser-filters input,.exercise-browser-filters select{width:100%;min-width:0;padding:9px 11px;border:1px solid #cbd5e1;border-radius:7px;background:#fff;font:inherit;font-size:11.5px;color:#1e293b;outline:none}.exercise-browser-filters input:focus,.exercise-browser-filters select:focus{border-color:#0d9488;box-shadow:0 0 0 2px #0d948826}.exercise-browser-summary{display:flex;align-items:center;flex-wrap:wrap;gap:12px;padding:9px 24px;border-bottom:1px solid #e2e8f0;font-size:11.5px;background:#fff}.exercise-browser-summary b{color:#1e293b}.exercise-browser-count-pill{padding:4px 10px;border-radius:999px;color:#fff;background:#0d9488;font-weight:700;font-size:11px}.exercise-browser-custom-counter{display:inline-flex;align-items:center;gap:4px;padding:4px 9px;border-radius:999px;background:#fef3c7;color:#92400e;font-weight:700;font-size:11px}.exercise-browser-summary button.reset-btn{margin-left:auto;border:0;background:none;color:#b91c1c;font-size:11px;font-weight:600;cursor:pointer;padding:4px 8px;border-radius:4px}.exercise-browser-summary 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10px;border-radius:6px;background:#f8fafc;border-left:3px solid #0d9488;color:#334155;font-size:11px;line-height:1.5;overflow-wrap:anywhere;white-space:pre-line}.exercise-browser-solution-box strong{color:#0f766e}.exercise-browser-solution-box .katex{font-size:1.1em}.exercise-browser-help-box{display:block;margin-top:4px;padding:6px 10px;border-radius:6px;background:#fefce8;border-left:3px solid #eab308;color:#713f12;font-size:10.5px;line-height:1.45}.exercise-browser-item-actions{display:flex;flex-direction:column;gap:6px}.exercise-item-action-btn{padding:5px 8px;border:1px solid #cbd5e1;border-radius:6px;background:#fff;color:#475569;font-size:11px;font-weight:600;cursor:pointer;transition:all .15s ease}.exercise-item-action-btn:hover{background:#f1f5f9;color:#0f172a}.exercise-item-action-btn.delete:hover{background:#fee2e2;border-color:#fca5a5;color:#dc2626}.exercise-browser-empty{padding:60px 20px;text-align:center;color:#64748b;font-size:13px}.exercise-browser>footer{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;border-top:1px solid #dbe3ec;background:#fff}.exercise-browser-pages{display:flex;align-items:center;gap:10px;font-size:11px;color:#334155;font-weight:600}.exercise-browser-pages button{padding:8px 14px;border:1px solid #cbd5e1;border-radius:7px;background:#fff;font-weight:700;cursor:pointer}.exercise-browser-pages button:hover:not(:disabled){background:#f1f5f9}.exercise-browser-apply{padding:10px 18px;border:none;border-radius:8px;background:#0d9488;color:#fff;font-size:12px;font-weight:800;cursor:pointer;box-shadow:0 2px 6px #0d948859;transition:all .15s ease}.exercise-browser-apply:hover:not(:disabled){background:#0f766e}.exercise-browser button:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.exercise-form-overlay{position:absolute;inset:0;z-index:50;background:#0f172ab3;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:grid;place-items:center;padding:16px;overflow-y:auto}.exercise-form-card{width:min(840px,94%);max-height:90vh;display:grid;grid-template-rows:auto 1fr auto;background:#fff;border-radius:14px;box-shadow:0 25px 60px #0006;overflow:hidden;animation:fadeInForm .18s ease-out}@keyframes fadeInForm{0%{opacity:0;transform:scale(.97)}to{opacity:1;transform:scale(1)}}.exercise-form-header{display:flex;justify-content:space-between;align-items:center;padding:16px 22px;border-bottom:1px solid #e2e8f0;background:#f8fafc}.exercise-form-header h3{margin:0;font-size:16px;font-weight:800;color:#0f172a}.exercise-form-body{padding:18px 22px;overflow-y:auto;display:grid;gap:16px}.exercise-form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}.exercise-form-group{display:flex;flex-direction:column;gap:6px}.exercise-form-group label{font-size:11.5px;font-weight:700;color:#334155}.exercise-form-group select,.exercise-form-group input[type=text],.exercise-form-group input[type=number],.exercise-form-group textarea{width:100%;padding:9px 12px;border:1px solid #cbd5e1;border-radius:7px;font:inherit;font-size:12px;color:#1e293b;outline:none;background:#fff}.exercise-form-group select:focus,.exercise-form-group input:focus,.exercise-form-group textarea:focus{border-color:#0d9488;box-shadow:0 0 0 2px #0d948826}.exercise-form-group textarea{min-height:85px;resize:vertical;line-height:1.5;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace}.exercise-pill-selector{display:flex;flex-wrap:wrap;gap:8px}.exercise-pill-btn{padding:7px 12px;border:1px solid #cbd5e1;border-radius:999px;background:#fff;font-size:11px;font-weight:700;color:#475569;cursor:pointer;transition:all .15s ease}.exercise-pill-btn:hover{background:#f1f5f9;border-color:#94a3b8}.exercise-pill-btn.active.facile{background:#166534;color:#fff;border-color:#166534}.exercise-pill-btn.active.media{background:#b45309;color:#fff;border-color:#b45309}.exercise-pill-btn.active.difficile{background:#b91c1c;color:#fff;border-color:#b91c1c}.exercise-pill-btn.active.track{background:#0d9488;color:#fff;border-color:#0d9488}.exercise-math-quick-bar{display:flex;flex-wrap:wrap;align-items:center;gap:4px;padding:6px 8px;background:#f1f5f9;border-radius:6px;border:1px solid #e2e8f0}.exercise-math-quick-bar span{font-size:10px;font-weight:700;color:#64748b;margin-right:4px}.quick-math-btn{padding:3px 7px;border:1px solid #cbd5e1;border-radius:4px;background:#fff;color:#1e293b;font-size:11px;font-family:ui-monospace,SFMono-Regular,monospace;font-weight:600;cursor:pointer;transition:background .1s}.quick-math-btn:hover{background:#e2e8f0;border-color:#94a3b8}.exercise-live-preview{margin-top:4px;padding:10px 14px;border-radius:7px;background:#f8fafc;border:1px dashed #cbd5e1;font-size:12px;line-height:1.55;color:#0f172a;min-height:38px;overflow-wrap:anywhere}.exercise-live-preview-label{font-size:9.5px;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:#64748b;margin-bottom:4px;display:block}.exercise-form-footer{display:flex;align-items:center;justify-content:flex-end;gap:12px;padding:14px 22px;border-top:1px solid #e2e8f0;background:#f8fafc}.exercise-form-cancel-btn{padding:9px 16px;border:1px solid #cbd5e1;border-radius:7px;background:#fff;color:#475569;font-size:12px;font-weight:700;cursor:pointer}.exercise-form-cancel-btn:hover{background:#f1f5f9}.exercise-form-save-btn{padding:9px 20px;border:none;border-radius:7px;background:#0d9488;color:#fff;font-size:12px;font-weight:800;cursor:pointer;box-shadow:0 2px 6px #0d948859}.exercise-form-save-btn:hover{background:#0f766e}@media(max-width:960px){.exercise-browser-filters{grid-template-columns:1fr 1fr 1fr}.exercise-form-row{grid-template-columns:1fr}}@media(max-width:640px){.exercise-browser-backdrop{padding:6px}.exercise-browser{width:100%;height:98vh}.exercise-browser-filters{grid-template-columns:1fr 1fr;padding:10px}.exercise-browser-list{padding:10px}.exercise-browser-item{grid-template-columns:auto 1fr}.exercise-browser-item-actions{grid-column:1 / -1;flex-direction:row;justify-content:flex-end}.exercise-browser>footer{padding:10px;flex-direction:column;gap:8px}.exercise-form-card{width:98%;max-height:95vh}}.exercise-browser-ai-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border:none;border-radius:8px;background:linear-gradient(135deg,#4338ca,#6d28d9);color:#fff;font-size:12px;font-weight:700;cursor:pointer;box-shadow:0 2px 4px #4f46e540;transition:all .2s ease}.exercise-browser-ai-btn:hover{background:linear-gradient(135deg,#3730a3,#5b21b6);transform:translateY(-1px);box-shadow:0 4px 8px 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