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var(--line);justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:18px;padding-bottom:14px;display:flex}.rte-formula-head-left{min-width:0}.rte-formula-badge-row{align-items:center;gap:8px;margin-bottom:4px;display:flex}.rte-formula-tag{background:var(--blue-soft);color:var(--blue);letter-spacing:.04em;text-transform:uppercase;border-radius:6px;align-items:center;gap:4px;padding:2px 7px;font-size:10px;font-weight:800;display:inline-flex}.rte-formula-tag.editing{background:var(--gold-soft);color:#8c5a08}.rte-formula-head h2{color:var(--ink);letter-spacing:-.02em;margin:0;font-size:19px;font-weight:850}.rte-formula-sub{color:var(--muted);margin:3px 0 0;font-size:12px;line-height:1.45}.rte-formula-head-actions{flex-shrink:0;align-items:center;gap:8px;display:flex}.btn-open-handbook-header{color:var(--blue);cursor:pointer;white-space:nowrap;background:#eff6ff;border:1px solid #bfdbfe;border-radius:10px;align-items:center;gap:6px;padding:8px 13px;font-size:12px;font-weight:800;transition:all .18s;display:inline-flex}.btn-open-handbook-header .icon{width:15px;height:15px}.btn-open-handbook-header:hover{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 4px 14px #3157a433}.rte-formula-layout{grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);align-items:stretch;gap:20px;display:grid}.rte-formula-editor-col{flex-direction:column;gap:10px;min-width:0;display:flex}.rte-formula-nav-section{flex-direction:column;gap:8px;display:flex}.rte-formula-search-input{width:100%;position:relative}.rte-formula-search-input input{border:1px solid var(--line);background:var(--surface);border-radius:10px;width:100%;padding:8px 36px 8px 12px;font-size:12px;transition:border-color .18s,box-shadow .18s,background .18s}.rte-formula-search-input input:focus{border-color:var(--red);background:#fff;outline:none;box-shadow:0 0 0 3px #bb25251f}.rte-formula-search-clear{width:20px;height:20px;color:var(--muted);cursor:pointer;background:#00000014;border:none;border-radius:50%;place-items:center;padding:0;display:grid;position:absolute;top:50%;right:8px;transform:translateY(-50%)}.rte-formula-search-clear .icon{width:11px;height:11px}.rte-formula-search-clear:hover{background:var(--red-soft);color:var(--red)}.rte-formula-tabs{scrollbar-width:thin;gap:4px;padding-bottom:2px;display:flex;overflow-x:auto}.rte-formula-tab-btn{border:1px solid var(--line);color:var(--muted);white-space:nowrap;cursor:pointer;background:#fff;border-radius:8px;flex-shrink:0;align-items:center;gap:5px;padding:5px 10px;font-size:11px;font-weight:750;transition:all .15s;display:inline-flex}.rte-formula-tab-btn:hover{color:var(--ink);background:var(--surface);border-color:#cfcac6}.rte-formula-tab-btn.active{border-color:var(--red);background:var(--red-soft);color:var(--red)}.rte-formula-tab-btn .count{background:#0000000f;border-radius:999px;padding:1px 4px;font-size:9px;font-weight:800}.rte-formula-tab-btn.active .count{color:var(--red);background:#bb252526}.rte-formula-search-results-info{background:var(--surface);color:var(--muted);border-radius:7px;justify-content:space-between;align-items:center;padding:5px 10px;font-size:11px;display:flex}.rte-formula-search-results-info strong{color:var(--ink)}.rte-formula-symbols-grid-wrap{border:1px solid var(--line);background:var(--surface);border-radius:12px;flex:1;min-height:220px;max-height:280px;padding:8px;overflow-y:auto}.rte-formula-symbols-grid{grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:5px;display:grid}.rte-symbol-btn{height:38px;color:var(--ink);cursor:pointer;-webkit-user-select:none;user-select:none;background:#fff;border:1px solid #dfdedb;border-radius:7px;justify-content:center;align-items:center;padding:0 4px;font-family:Cambria Math,KaTeX_Main,Times New Roman,Georgia,serif;font-size:14px;font-weight:700;transition:transform .12s,border-color .15s,background .15s,color .15s,box-shadow .15s;display:inline-flex}.rte-symbol-btn:hover{border-color:var(--red);color:var(--red);background:var(--red-soft);z-index:2;transform:translateY(-2px);box-shadow:0 4px 10px #bb25251f}.rte-symbol-btn.is-selected{border-color:var(--blue);background:var(--blue-soft);color:var(--blue);box-shadow:0 0 0 2px #3157a433}.rte-symbol-btn:active{transform:translateY(0)scale(.96)}.rte-formula-no-symbols{text-align:center;color:var(--muted);padding:20px 10px;font-size:11px}.rte-formula-no-symbols p{margin:0 0 8px}.rte-formula-quick-toolbar{border:1px solid var(--line);background:#fff;border-radius:9px;flex-wrap:wrap;align-items:center;gap:6px;padding:5px 8px;display:flex}.rte-formula-quick-label{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;white-space:nowrap;font-size:10px;font-weight:800}.rte-formula-quick-list{flex-wrap:wrap;flex:1;align-items:center;gap:4px;display:flex}.rte-quick-btn{border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;border-radius:6px;align-items:center;gap:4px;padding:3px 7px;font-size:11px;font-weight:750;transition:all .15s;display:inline-flex}.rte-quick-btn .badge{color:var(--ink);background:#fff;border:1px solid #e0dedc;border-radius:4px;padding:1px 3px;font-family:monospace;font-size:9px;font-weight:700;display:inline-block;position:static}.rte-quick-btn:hover{border-color:var(--red);background:var(--red-soft);color:var(--red)}.rte-quick-btn:hover .badge{color:var(--red);border-color:#bb25254d}.rte-formula-preview-col{flex-direction:column;gap:14px;min-width:0;display:flex}.rte-formula-unified-editor-card{border:1px solid var(--line);background:#fff;border-radius:14px;flex-direction:column;display:flex;overflow:hidden;box-shadow:0 2px 10px #18182a08}.rte-formula-input-section{flex-direction:column;gap:5px;padding:10px 12px 8px;display:flex}.rte-formula-input-header{justify-content:space-between;align-items:center;display:flex}.rte-formula-input-label{color:var(--ink);align-items:baseline;gap:6px;font-size:11px;display:flex}.rte-formula-input-label strong{font-weight:800}.rte-formula-helper-text{color:var(--muted);font-size:10px}.rte-formula-clear-btn{color:var(--red);cursor:pointer;background:0 0;border:none;border-radius:5px;padding:1px 5px;font-size:10px;font-weight:750;transition:background .15s}.rte-formula-clear-btn:hover{background:var(--red-soft)}.rte-formula-textarea-wrapper textarea{border:1px solid var(--line);width:100%;color:var(--ink);resize:vertical;background:#fff;border-radius:9px;min-height:60px;padding:8px 10px;font-family:SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,monospace;font-size:12px;line-height:1.5;transition:border-color .18s,box-shadow .18s}.rte-formula-textarea-wrapper textarea:focus{border-color:var(--red);outline:none;box-shadow:0 0 0 3px #bb25251f}.rte-formula-syntax-alert{color:#92540b;background:#fff8eb;border:1px solid #fae1b8;border-radius:6px;align-items:center;gap:6px;padding:5px 8px;font-size:10px;font-weight:650;display:flex}.rte-formula-syntax-alert .icon{color:#b7791f;flex-shrink:0;width:12px;height:12px}.rte-formula-hint-section{background:linear-gradient(#f8fbff 0%,#f1f6fd 100%);border-top:1px dashed #dbeafe;padding:8px 12px}.rte-hint-content{justify-content:space-between;align-items:center;gap:10px;display:flex}.rte-hint-meta{flex-direction:column;flex:1;gap:4px;min-width:0;display:flex}.rte-hint-title-group{flex-wrap:wrap;align-items:center;gap:5px;display:flex}.rte-hint-title-group .icon{width:13px;height:13px;color:var(--blue);flex-shrink:0}.hint-title{color:var(--ink);font-size:11px;font-weight:850}.hint-syntax{color:var(--blue);white-space:nowrap;text-overflow:ellipsis;background:#fff;border:1px solid #bfdbfe;border-radius:4px;max-width:220px;padding:1px 5px;font-family:SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:10px;overflow:hidden}.rte-hint-example-preview{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.hint-label{color:#64748b;text-transform:uppercase;font-size:9px;font-weight:800}.hint-example-code{color:#1e293b;white-space:nowrap;text-overflow:ellipsis;background:#ffffffd9;border:1px solid #e2e8f0;border-radius:4px;max-width:170px;padding:1px 5px;font-family:SFMono-Regular,Menlo,monospace;font-size:10px;overflow:hidden}.hint-example-render{color:#1e3a8a;align-items:center;font-size:11px;display:inline-flex}.btn-contextual-insert{border:1px solid var(--blue);background:var(--blue);color:#fff;cursor:pointer;white-space:nowrap;border-radius:7px;flex-shrink:0;padding:4px 10px;font-size:11px;font-weight:800;transition:all .15s}.btn-contextual-insert:hover{background:#234280;border-color:#234280}.rte-formula-preview-card{border:1px solid var(--line);background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 2px 10px #18182a08}.rte-formula-preview-head{background:var(--surface);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:8px;padding:8px 12px;display:flex}.rte-formula-preview-title{color:var(--ink);align-items:center;gap:5px;font-size:11px;font-weight:800;display:flex}.rte-formula-preview-title .icon{width:14px;height:14px;color:var(--red)}.rte-formula-preview-tools{align-items:center;gap:5px;display:flex}.rte-preview-mode-toggle{border:1px solid var(--line);color:var(--muted);cursor:pointer;background:#fff;border-radius:6px;padding:3px 7px;font-size:10px;font-weight:800;transition:all .15s}.rte-preview-mode-toggle.active{background:var(--navy);border-color:var(--navy);color:#fff}.rte-copy-btn{border:1px solid var(--line);color:var(--ink);cursor:pointer;background:#fff;border-radius:6px;align-items:center;gap:3px;padding:3px 7px;font-size:10px;font-weight:800;transition:all .15s;display:inline-flex}.rte-copy-btn .icon{width:11px;height:11px}.rte-copy-btn:hover:not(:disabled){border-color:var(--red);color:var(--red);background:var(--red-soft)}.rte-copy-btn.copied{border-color:var(--teal);background:var(--teal-soft);color:var(--teal)}.rte-copy-btn:disabled{opacity:.5;cursor:not-allowed}.rte-formula-preview-canvas{text-align:center;background-color:#fdfdfd;background-image:radial-gradient(#e5e7eb 1px,#0000 1px);background-size:14px 14px;justify-content:center;align-items:center;min-height:110px;padding:16px 14px;font-size:17px;display:flex;overflow-x:auto}.rte-formula-empty-state{color:var(--muted);flex-direction:column;justify-content:center;align-items:center;gap:3px;display:flex}.rte-formula-empty-icon{color:#d1d5db;font-family:Georgia,serif;font-size:24px}.rte-formula-empty-state p{color:var(--ink);margin:0;font-size:11px;font-weight:700}.rte-formula-empty-state small{color:var(--muted);font-size:9px}.rte-formula-preview-canvas .katex{color:#172554;font-size:1.15em}.rte-formula-preview-canvas .katex-display{margin:.3em 0}.rte-formula-preview-canvas .katex-error{color:var(--red);background:var(--red-soft);border:1px dashed var(--red);border-radius:5px;padding:3px 6px;font-family:monospace;font-size:11px}.rte-formula-preview-footer-note{background:var(--surface);border-top:1px solid var(--line);color:var(--muted);align-items:center;gap:5px;padding:6px 10px;font-size:9px;display:flex}.example-code-col code{color:var(--ink);white-space:nowrap;text-overflow:ellipsis;max-width:170px;font-family:SFMono-Regular,Menlo,monospace;font-size:10px;overflow:hidden}.example-render-col{color:#1e3a8a;flex-shrink:0;font-size:11px}.rte-formula-actions-bar{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:16px;margin-top:18px;padding-top:14px;display:flex}.rte-formula-shortcuts-hint{color:var(--muted);align-items:center;gap:6px;font-size:11px;display:flex}.hint-pill{background:var(--surface);border:1px solid var(--line);color:var(--muted);text-transform:uppercase;border-radius:4px;padding:1px 5px;font-size:9px;font-weight:800}.rte-formula-shortcuts-hint strong{color:var(--ink)}.rte-formula-actions{flex-flow:row;flex-shrink:0;justify-content:flex-end;align-items:center;gap:8px;display:flex}.rte-formula-actions .btn{white-space:nowrap;border-radius:8px;gap:6px;height:35px;min-height:35px;padding:0 13px;font-size:12px;font-weight:800}.btn-delete-formula{color:var(--red);border-color:#bb25254d}.btn-delete-formula:hover{background:var(--red-soft);border-color:var(--red)}.rte-handbook-modal{background:#fff;border:1px solid #fffc;border-radius:20px;flex-direction:column;width:min(100vw - 32px,980px);max-height:min(90vh,840px);padding:24px 28px;display:flex;overflow-y:auto;box-shadow:0 25px 75px #17172b59}.rte-handbook-head{border-bottom:1px solid var(--line);justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:16px;padding-bottom:14px;display:flex}.rte-handbook-tag-row{align-items:center;gap:6px;margin-bottom:4px;display:flex}.rte-handbook-badge{background:var(--blue-soft);color:var(--blue);text-transform:uppercase;border-radius:6px;padding:2px 7px;font-size:10px;font-weight:800}.rte-handbook-sub-badge{background:var(--teal-soft);color:var(--teal);border-radius:6px;padding:2px 7px;font-size:10px;font-weight:800}.rte-handbook-head h2{color:var(--ink);margin:0;font-size:20px;font-weight:850}.rte-handbook-head p{color:var(--muted);margin:4px 0 0;font-size:12px;line-height:1.45}.rte-handbook-toolbar{flex-direction:column;gap:10px;margin-bottom:16px;display:flex}.rte-handbook-search{width:100%}.rte-handbook-search input{border:1px solid var(--line);background:var(--surface);border-radius:10px;width:100%;padding:9px 38px 9px 12px;font-size:12px}.rte-handbook-search input:focus{border-color:var(--blue);background:#fff;outline:none;box-shadow:0 0 0 3px #3157a41f}.rte-handbook-tabs{scrollbar-width:thin;gap:6px;padding-bottom:4px;display:flex;overflow-x:auto}.rte-handbook-tab-btn{border:1px solid var(--line);color:#475569;white-space:nowrap;cursor:pointer;background:#fff;border-radius:9px;flex-shrink:0;padding:6px 12px;font-size:11px;font-weight:750;transition:all .15s}.rte-handbook-tab-btn:hover{color:var(--ink);background:#f1f5f9}.rte-handbook-tab-btn.active{background:var(--blue);border-color:var(--blue);color:#fff}.rte-handbook-body{scrollbar-width:thin;flex:1;min-height:280px;max-height:480px;padding-right:4px;overflow-y:auto}.rte-handbook-groups-wrap{flex-direction:column;gap:18px;display:flex}.rte-handbook-group-header{border-bottom:1px dashed var(--line);margin-bottom:10px;padding-bottom:6px}.rte-handbook-group-header strong{color:var(--blue);font-size:13px;display:block}.rte-handbook-group-header span{color:var(--muted);font-size:11px}.rte-handbook-cards-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.rte-handbook-card{background:#fff;border:1px solid #e2e8f0;border-radius:12px;flex-direction:column;gap:8px;padding:12px 14px;transition:border-color .18s,box-shadow .18s;display:flex;box-shadow:0 2px 8px #18182a05}.rte-handbook-card:hover{border-color:#93c5fd;box-shadow:0 4px 14px #3157a414}.rte-handbook-card-top{justify-content:space-between;align-items:flex-start;gap:8px;display:flex}.rte-handbook-card-name-group{flex-direction:column;gap:3px;min-width:0;display:flex}.rte-handbook-card-name-group strong{color:var(--ink);font-size:12px;font-weight:850}.syntax-code{color:var(--blue);white-space:nowrap;text-overflow:ellipsis;background:#f1f5f9;border-radius:4px;width:fit-content;max-width:260px;padding:2px 6px;font-family:SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:10px;overflow:hidden}.rte-handbook-card-actions{flex-shrink:0;align-items:center;gap:4px;display:flex}.btn-handbook-action{border:1px solid var(--line);cursor:pointer;background:#fff;border-radius:6px;align-items:center;gap:4px;padding:4px 8px;font-size:10px;font-weight:800;transition:all .15s;display:inline-flex}.btn-handbook-action.copy{color:var(--ink)}.btn-handbook-action.copy .icon{width:11px;height:11px}.btn-handbook-action.copy:hover{border-color:var(--blue);background:var(--blue-soft);color:var(--blue)}.btn-handbook-action.copy.copied{border-color:var(--teal);background:var(--teal-soft);color:var(--teal)}.btn-handbook-action.insert{background:var(--blue);border-color:var(--blue);color:#fff}.btn-handbook-action.insert:hover{background:#234280}.rte-handbook-desc{color:#475569;margin:0;font-size:11px;line-height:1.45}.rte-handbook-note{color:#9a3412;background:#fff8eb;border:1px solid #fed7aa;border-radius:6px;align-items:center;gap:6px;padding:5px 8px;font-size:10px;display:flex}.rte-handbook-note .icon{flex-shrink:0;width:12px;height:12px}.rte-handbook-example-box{background:#f8fafc;border:1px solid #e2e8f0;border-radius:8px;justify-content:space-between;align-items:center;gap:12px;padding:8px 10px;display:flex}.example-header{flex-direction:column;gap:2px;min-width:0;display:flex}.example-header .label{color:#94a3b8;text-transform:uppercase;font-size:9px;font-weight:800}.example-code{color:var(--ink);white-space:nowrap;text-overflow:ellipsis;max-width:220px;font-family:SFMono-Regular,Menlo,monospace;font-size:10px;overflow:hidden}.example-render{color:#1e3a8a;flex-shrink:0;font-size:12px}.rte-handbook-empty{color:var(--muted);flex-direction:column;justify-content:center;align-items:center;gap:8px;padding:40px 20px;display:flex}.rte-handbook-empty .icon{color:#cbd5e1;width:32px;height:32px}.rte-handbook-foot{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:16px;margin-top:16px;padding-top:14px;display:flex}.rte-handbook-foot .btn{white-space:nowrap;border-radius:8px;flex-shrink:0;width:auto;min-width:64px;height:33px;min-height:33px;padding:0 16px;font-size:12px;font-weight:800}.handbook-tip{color:var(--muted);font-size:11px}.handbook-tip strong{color:var(--blue)}@media (max-width:960px){.rte-formula-panel{padding:18px 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18px;font-size:13.5px}.ui-search-bar{align-items:center;width:100%;display:flex;position:relative}.ui-search-icon{color:#94a3b8;pointer-events:none;width:15px;height:15px;position:absolute;left:12px}.ui-search-input{color:#0f172a;background:#f8fafc;border:1px solid #cbd5e1;border-radius:10px;outline:none;width:100%;height:40px;padding:0 32px 0 36px;font-size:13.5px;transition:all .15s}.ui-search-input:focus{background:#fff;border-color:#bb2525;box-shadow:0 0 0 3px #bb25251f}.ui-search-bar.search-sm .ui-search-input{height:34px;padding:0 28px 0 32px;font-size:12.5px}.ui-search-bar.search-lg .ui-search-input{height:46px;padding:0 36px 0 42px;font-size:14.5px}.ui-search-clear{color:#64748b;cursor:pointer;background:#e2e8f0;border:none;border-radius:50%;place-items:center;width:22px;height:22px;padding:0;font-size:11px;transition:all 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.ui-filter-pill-count{color:#fff;background:#fff3}.ui-pagination-wrap{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:14px 0;display:flex}.ui-pagination-meta{color:#64748b;font-size:13px}.ui-pagination-meta strong{color:#0f172a}.ui-pagination-buttons{align-items:center;gap:5px;display:flex}.ui-page-num-btn,.ui-page-nav-btn{color:#475569;cursor:pointer;background:#fff;border:1px solid #e2e8f0;border-radius:8px;place-items:center;min-width:34px;height:34px;font-size:13px;font-weight:750;transition:all .15s;display:grid}.ui-page-num-btn:hover:not(:disabled),.ui-page-nav-btn:hover:not(:disabled){color:#0f172a;background:#f8fafc;border-color:#cbd5e1}.ui-page-num-btn.active{color:#fff;background:#bb2525;border-color:#bb2525}.ui-page-nav-btn:disabled{opacity:.4;cursor:not-allowed}.ui-page-ellipsis{color:#94a3b8;padding:0 4px;font-size:14px}.ui-confirm-dialog .ui-confirm-body{align-items:flex-start;gap:14px;padding:8px 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.bp-mcq-option-card{color:#e2e8f0;background:#20202e;border-color:#2e2e42}.bp-header-left{align-items:center;gap:5px;display:flex}.bp-header-icon{width:12px;height:12px;color:var(--muted)}.bp-title-wrap{margin-bottom:12px}.bp-chapter-tag{text-transform:uppercase;letter-spacing:.06em;color:#0f766e;margin-bottom:4px;font-size:10px;font-weight:800;display:inline-block}.bp-heading{color:#bb2525;letter-spacing:-.01em;margin:0 0 4px;font-size:15px;font-weight:850}.bp-subheading{color:#475569;margin:0;font-size:12px;font-weight:750}.bp-content-text{margin-bottom:14px;font-size:12.5px;line-height:1.75}.bp-formula-box{background:#f8fafc;border:1px solid #e2e8f0;border-radius:12px;margin-bottom:16px;padding:12px 16px}.bp-formula-label{color:#64748b;margin-bottom:6px;font-size:11px;font-weight:800;display:block}.bp-formula-content{text-align:center;color:#1e3a8a;font-size:14px}.bp-video-card{cursor:pointer;text-align:left;background:linear-gradient(135deg,#fff 0%,#fff5f5 100%);border:1px solid #fecaca;border-radius:12px;align-items:center;gap:12px;width:100%;margin-bottom:16px;padding:12px 14px;transition:all .15s;display:flex}.bp-video-card:hover{border-color:#bb2525;transform:translateY(-1px);box-shadow:0 4px 14px #bb25251f}.bp-video-play-btn{color:#fff;background:#bb2525;border-radius:50%;flex-shrink:0;place-items:center;width:38px;height:38px;display:grid;box-shadow:0 4px 10px #bb25254d}.bp-video-play-btn .icon{width:16px;height:16px}.bp-video-info strong{color:#0f172a;margin-bottom:2px;font-size:12px;font-weight:800;display:block}.bp-video-info small{color:#64748b;font-size:11px;display:block}.bp-video-cta{color:#bb2525;font-weight:750}.bp-question-box{background:#fff9;border:1.5px dashed #cbd5e1;border-radius:14px;margin-bottom:16px;padding:14px 16px}.bp-question-head{margin-bottom:10px}.bp-question-badge{color:#1d4ed8;text-transform:uppercase;background:#eff6ff;border-radius:5px;margin-bottom:6px;padding:2px 7px;font-size:10px;font-weight:800;display:inline-block}.bp-question-badge.mcq{color:#be185d;background:#fdf2f8}.bp-question-prompt{margin:0;font-size:12.5px;font-weight:700;line-height:1.5}.bp-answer-form{align-items:center;gap:8px;display:flex}.bp-answer-label{color:#0f172a;font-size:12px;font-weight:800}.bp-answer-input{border:1px solid #cbd5e1;border-radius:8px;outline:none;flex:1;max-width:180px;height:34px;padding:0 10px;font-size:12.5px}.bp-answer-input:focus{border-color:#bb2525;box-shadow:0 0 0 2px #bb252533}.bp-mcq-options-grid{grid-template-columns:1fr 1fr;gap:8px;margin-bottom:10px;display:grid}.bp-mcq-option-card{cursor:pointer;background:#fff;border:1px solid #e2e8f0;border-radius:10px;align-items:center;gap:8px;padding:9px 12px;transition:all .15s;display:flex}.bp-mcq-option-card input{display:none}.bp-mcq-key-pill{color:#475569;background:#f1f5f9;border-radius:6px;flex-shrink:0;place-items:center;width:22px;height:22px;font-size:11px;font-weight:850;transition:all .15s;display:grid}.bp-mcq-text{font-size:12px;font-weight:650}.bp-mcq-option-card:hover{background:#f8fafc;border-color:#cbd5e1}.bp-mcq-option-card.is-selected{background:#fff1f2;border-color:#bb2525}.bp-mcq-option-card.is-selected .bp-mcq-key-pill{color:#fff;background:#bb2525}.bp-mcq-foot{justify-content:flex-end;display:flex}.toc-search-box{margin:12px 0 10px;position:relative}.toc-search-box input{color:#0f172a;background:#f8fafc;border:1px solid #cbd5e1;border-radius:9px;outline:none;width:100%;height:36px;padding:0 28px 0 32px;font-size:12.5px}.toc-search-box .icon{color:#94a3b8;width:14px;height:14px;position:absolute;top:50%;left:10px;transform:translateY(-50%)}.toc-search-box button{color:#94a3b8;cursor:pointer;background:0 0;border:none;padding:0 4px;position:absolute;top:50%;right:6px;transform:translateY(-50%)}.reader-toc-group{margin-bottom:12px}.shortcuts-list{flex-direction:column;gap:10px;margin:14px 0;display:flex}.shortcut-item{color:#334155;background:#f8fafc;border:1px solid #e2e8f0;border-radius:10px;justify-content:space-between;align-items:center;padding:10px 12px;font-size:13px;display:flex}.shortcut-keys kbd{color:#0f172a;background:#fff;border:1px solid #cbd5e1;border-radius:6px;padding:3px 8px;font-size:12px;font-weight:800;display:inline-block;box-shadow:0 1px 2px #0000001a}.book-3d-cover.has-image{aspect-ratio:800/1132;background:#fff;width:auto;max-width:100%;padding:0}.book-3d-cover.has-image img,.featured-book-cover.has-image img{object-fit:cover;width:100%;height:100%;display:block}.book-3d-cover.has-image:before{background:linear-gradient(90deg,#00000047,#fff3);width:6px}.book-shop-cover-wrap .book-3d-cover.has-image{height:250px}.featured-book-card-modern .book-3d-cover.has-image{width:100%;height:auto}.featured-book-card .featured-book-cover.has-image{background:var(--surface);place-items:center;padding:14px;display:grid}.featured-book-card .featured-book-cover.has-image img{border-radius:3px 7px 7px 3px;height:auto;box-shadow:8px 10px 18px #01193d38}.course-cover-modern.cover-toan{background:linear-gradient(135deg,#0f2a6b 0%,#2563eb 100%)}.course-cover-modern.cover-vatly{background:linear-gradient(135deg,#0f172a 0%,#475569 100%)}.course-cover-modern.cover-hoahoc{background:linear-gradient(135deg,#7a1414 0%,#d63a2b 100%)}.course-cover-modern.cover-sinhhoc{background:linear-gradient(135deg,#064e3b 0%,#16a34a 100%)}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@keyframes spin{to{transform:rotate(360deg)}}