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10px;font-size:11px;display:flex}.theme-option:hover{background:var(--hover);color:var(--ink)}.theme-option[aria-pressed=true]{background:var(--green-light);color:var(--green);box-shadow:inset 0 0 0 1px var(--accent-border)}.theme-option:disabled{cursor:default}@media (width<=760px){.topbar-actions{gap:0}.topbar-actions .lab-link,.brand-product,.brand-divider{display:none}.theme-option{min-width:44px;min-height:44px;padding:0}.theme-option span{display:none}.theme-option svg{width:17px;height:17px}}.study-topbar{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;min-height:66px;display:flex}.study-title{white-space:nowrap;font-size:16px;font-weight:650}.study-tabs{flex-wrap:wrap;gap:8px;padding:15px 0 12px;display:flex}.study-tabs button{border:1px solid var(--line);color:var(--muted);background:0 0;border-radius:6px;min-height:44px;padding:9px 13px;font-size:13px}.study-tabs button[aria-pressed=true]{background:var(--green-light);border-color:var(--accent-border);color:var(--green)}.progress-sync{border:1px solid var(--line);color:var(--muted);background:var(--surface);border-radius:8px;margin-bottom:8px;font-size:12px}.progress-sync summary{cursor:pointer;min-height:44px;padding:12px 14px}.progress-sync summary span{margin-left:12px;font-size:11px}.sync-body{padding:0 14px 15px;line-height:1.8}.sync-body p{margin:8px 0 12px}.sync-actions{flex-wrap:wrap;gap:10px;display:flex}.file-label{cursor:pointer;position:relative;overflow:hidden}.file-label input{opacity:0;cursor:pointer;width:100%;position:absolute;inset:0}.file-label:focus-within{outline:3px solid var(--focus);outline-offset:3px}.import-preview{background:var(--green-light);border-radius:7px;margin-top:14px;padding:12px}.sync-error{color:var(--warning)}.storage-note{color:var(--green)}.study-shell .workspace{padding-top:18px}.question-search{border:1px solid var(--line);background:var(--surface);color:var(--muted);border-radius:8px;align-items:center;gap:10px;min-height:46px;padding:0 12px;display:flex}.question-search:focus-within{outline:2px solid var(--focus);outline-offset:2px}.question-search input{width:100%;min-width:0;color:var(--ink);font:inherit;background:0 0;border:0;outline:none;padding:12px 0;font-size:16px}.question-search input::placeholder{color:var(--muted);font-size:13px}.question-search button{color:var(--green);white-space:nowrap;background:0 0;border:0;min-height:44px;font-size:12px}.study-shell .practice-bar h2{margin:0;font-size:18px}.study-shell .group-bar{margin:5px 0 12px}.empty-results{text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:8px;padding:35px 18px;font-size:14px;line-height:1.8}.pagination{color:var(--muted);justify-content:center;align-items:center;gap:18px;margin:25px 0 40px;font-size:12px;display:flex}.pagination button:disabled{cursor:default}.pinned-note{color:var(--muted);justify-content:space-between;align-items:center;gap:10px;font-size:12px;display:flex}@media (width<=760px){.study-title{font-size:15px}.study-topbar{min-height:63px}.study-tabs{gap:6px;padding:12px 0 10px}.study-tabs button{padding:8px 11px;font-size:12px}.progress-sync summary span{margin-left:8px;font-size:10px;display:inline-block}.study-shell .workspace{padding-top:0}.study-shell .sidebar{margin-bottom:15px}.sync-actions .secondary-button{min-height:44px}.pagination{gap:12px}.study-shell .practice-bar{min-height:56px}}.loading-message{color:var(--muted);margin:0 0 10px;font-size:11px;line-height:1.8}.code-implementation{border-top:1px solid var(--soft-line);min-width:0;margin-top:24px;padding-top:16px}.implementation-toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px;display:flex}.implementation-toolbar h4{color:var(--ink);margin:0;font-size:13px;font-weight:650}.code-language-switch{border:1px solid var(--line);background:var(--paper);border-radius:8px;gap:3px;padding:3px;display:flex}.code-language-switch button{min-width:74px;min-height:44px;color:var(--muted);font:12px var(--font-mono);background:0 0;border:0;border-radius:5px;padding:8px 14px}.code-language-switch button:hover{background:var(--hover);color:var(--ink)}.code-language-switch button[aria-pressed=true]{background:var(--green-light);color:var(--green);box-shadow:inset 0 0 0 1px var(--accent-border)}.implementation-content>pre:first-child{margin-top:0}.implementation-content{min-width:0}.question-knowledge{border-top:1px solid var(--soft-line);color:var(--muted);flex-wrap:wrap;align-items:flex-start;gap:10px 20px;padding:14px 0 18px;font-size:12px;display:flex}.question-knowledge>span{white-space:nowrap;align-items:center;gap:6px;line-height:1.8;display:flex}.question-knowledge>div{flex-direction:column;gap:8px;min-width:0;display:flex}.question-knowledge a{color:var(--green);overflow-wrap:anywhere;align-items:center;gap:4px;line-height:1.8;display:flex}.question-knowledge a:hover{text-underline-offset:4px;text-decoration:underline}.knowledge-intro{color:var(--muted);margin:0 0 22px;font-size:13px;line-height:1.8}.knowledge-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-bottom:40px;display:grid}.knowledge-card{border:1px solid var(--line);background:var(--surface);box-shadow:var(--card-shadow);border-radius:10px;flex-direction:column;align-items:flex-start;min-width:0;padding:23px;transition:border-color .15s;display:flex}.knowledge-card:hover{border-color:var(--accent-border)}.knowledge-category{color:var(--subtle);font-size:11px}.knowledge-card h3{color:var(--ink);overflow-wrap:anywhere;margin:10px 0;font-size:17px;line-height:1.6}.knowledge-card p{color:var(--muted);-webkit-line-clamp:3;-webkit-box-orient:vertical;margin:0 0 20px;font-size:13px;line-height:1.85;display:-webkit-box;overflow:hidden}.knowledge-card-action{color:var(--green);margin-top:auto;font-size:12px}.document-area{min-width:0;margin-bottom:50px}.document-context{color:var(--muted);justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px;font-size:12px;display:flex}.document-card{background:var(--surface);border:1px solid var(--line);box-shadow:var(--card-shadow);border-radius:11px;min-width:0;padding:32px}.document-card>h1{letter-spacing:-.4px;overflow-wrap:anywhere;margin-bottom:28px;font-size:27px;line-height:1.6}.document-content{color:var(--ink);font-size:15px;line-height:2}.document-content p{margin-bottom:18px}.document-content h2{color:var(--ink);margin:36px 0 16px;font-size:21px;line-height:1.7}.document-content h3{color:var(--ink);margin:28px 0 14px;font-size:18px;line-height:1.7}.document-content h4{margin:24px 0 12px;font-size:16px;line-height:1.7}.document-content h2:first-child{margin-top:0}.document-content pre code{font-size:12px}.document-content th,.document-content td{font-size:13px}.document-content hr{border:0;border-top:1px solid var(--line);margin:32px 0}.document-content h2,.document-content h3,.document-content h4{scroll-margin-top:24px}.document-toc>button{margin:0 0 18px;font-size:12px}.document-toc nav{overscroll-behavior:contain;max-height:calc(100vh - 150px);padding-right:8px;overflow-y:auto}.document-toc .sidebar-label{margin:0 0 12px}.document-toc nav a{color:var(--muted);overflow-wrap:anywhere;border-radius:5px;padding:7px 8px;font-size:12px;line-height:1.7;display:block}.document-toc nav a:hover{background:var(--hover);color:var(--green)}.document-toc .toc-subsection{padding-left:20px;font-size:11px}.document-related{margin-top:25px}.document-related h2{font-size:15px;font-weight:600}.document-related>div{flex-wrap:wrap;gap:8px;display:flex}.document-related a{border:1px solid var(--line);background:var(--surface);color:var(--green);font:12px var(--font-mono);border-radius:6px;align-items:center;min-height:38px;padding:8px 10px;display:flex}.document-related a:hover{border-color:var(--accent-border)}.document-load-state{min-height:160px;color:var(--muted);padding:20px 0;font-size:14px;line-height:1.8}@media (width<=1000px){.knowledge-grid{grid-template-columns:minmax(0,1fr)}.document-card{padding:25px}.knowledge-workspace{gap:28px}}@media (width<=760px){.question-knowledge{gap:8px;padding-bottom:15px}.question-knowledge>div{width:100%}.question-knowledge a{min-height:32px;font-size:12px}.knowledge-workspace .sidebar{position:static}.knowledge-workspace .module-list{flex-wrap:nowrap;overflow-x:auto}.knowledge-workspace .module-button{flex-shrink:0;width:auto}.knowledge-workspace .module-count{display:none}.knowledge-card{padding:20px}.document-toc nav{border:1px solid var(--line);border-radius:7px;max-height:140px;padding:8px 10px}.document-toc>button{margin-bottom:8px}.document-context{font-size:11px}.document-card{padding:22px 18px}.document-card>h1{margin-bottom:23px;font-size:23px}.document-content{font-size:15px}.document-content h2{font-size:19px}.document-content h3{font-size:17px}.document-content pre{margin-left:-6px;margin-right:-6px;padding:13px 12px}.document-content pre code{font-size:11px}.document-related a{min-height:44px}}.reading-preferences .rich-text{font-size:var(--reading-font-size,16px)}.reading-preferences .rich-text code{font-size:.875em}.reading-preferences .rich-text pre code{font-size:calc(var(--reading-font-size,16px)*.875)}.reading-preferences .rich-text th,.reading-preferences .rich-text td{font-size:.9em}.reading-preferences .rich-text h2{font-size:1.4em}.reading-preferences .rich-text h3{font-size:1.2em}.reading-preferences .rich-text h4{font-size:1.08em}.reading-preferences .question-card>h3{font-size:calc(var(--reading-font-size,16px)*1.125)}.reading-preferences .document-card>h1{font-size:calc(var(--reading-font-size,16px)*1.6)}.reading-tools{border-bottom:1px solid var(--line);color:var(--muted);flex-wrap:wrap;align-items:center;gap:14px;margin-bottom:4px;padding:2px 0 13px;font-size:12px;display:flex}.font-controls{align-items:center;gap:2px;display:flex}.font-controls>span{margin-right:6px}.font-controls button{border:1px solid var(--line);background:var(--surface);min-width:36px;min-height:36px;color:var(--ink);border-radius:5px;justify-content:center;align-items:center;display:flex}.font-controls button:hover{background:var(--hover)}.font-controls button:disabled{cursor:default}.font-controls .font-reset{font:13px var(--font-mono)}.annotation-hint{font-size:11px}.reading-actions{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:18px;max-width:100%;margin-left:auto;display:flex}.comments-entry{color:var(--green);white-space:nowrap;background:0 0;border:0;align-items:center;gap:6px;min-height:36px;padding:6px 0;font-size:12px;display:flex}.comments-entry>span{background:var(--green-light);font:11px var(--font-mono);border-radius:4px;padding:2px 5px}.local-storage-error{color:var(--warning);background:var(--warning-bg);border:1px solid var(--warning-line);border-radius:7px;padding:12px 15px;font-size:13px;line-height:1.8}.status-filters{flex-wrap:wrap;align-items:center;gap:7px;margin:12px 0;display:flex}.status-filters button{min-height:40px;color:var(--muted);border:1px solid var(--line);background:0 0;border-radius:6px;align-items:center;gap:6px;padding:7px 10px;font-size:12px;display:flex}.status-filters button[aria-pressed=true]{background:var(--green-light);color:var(--green);border-color:var(--accent-border)}.status-filters button>span{font:10px var(--font-mono);opacity:.8}.local-status-hint{color:var(--subtle);margin-left:auto;font-size:10px}.question-card-controls{flex-wrap:wrap;align-items:center;gap:16px;display:flex}.question-status{background:var(--paper);color:var(--muted);white-space:nowrap;border-radius:8px;align-items:center;gap:2px;padding:3px;font-size:11px;display:inline-flex}.question-status-option{cursor:pointer;-webkit-user-select:none;user-select:none;position:relative}.question-status-option input{clip-path:inset(50%);width:1px;height:1px;margin:0;position:absolute;top:50%;left:50%;overflow:hidden}.question-status-option span{border-radius:5px;justify-content:center;align-items:center;min-width:42px;min-height:28px;padding:4px 8px;line-height:1.5;transition:background .15s,color .15s;display:flex}.question-status-option:hover span{background:var(--hover);color:var(--ink)}.question-status-option input:checked+span{background:var(--surface);color:var(--ink);font-weight:550;box-shadow:0 1px 3px #0000000d}.question-status-option input[value=done]:checked+span{background:var(--green-light);color:var(--green)}.question-status-option input[value=wrong]:checked+span{background:var(--warning-bg);color:var(--warning)}.question-status-option input:focus-visible+span{outline:2px solid var(--focus);outline-offset:-2px}@media (pointer:coarse){.question-status-option span{min-width:44px;min-height:38px}}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@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}.reading-preferences{--annotation-underline:#a88551;--thought-blue:#4b94dc;--thought-input:#f3f4f4}:root[data-theme=dark] .reading-preferences{--annotation-underline:#c0a06f;--thought-blue:#73ace0;--thought-input:#2a322e}.annotation-mark{color:inherit;text-decoration:underline;-webkit-text-decoration-color:var(--annotation-underline);text-decoration-color:var(--annotation-underline);text-underline-offset:5px;cursor:pointer;-webkit-box-decoration-break:clone;box-decoration-break:clone;-webkit-user-select:text;user-select:text;background:0 0;text-decoration-thickness:1px}.annotation-selection{color:inherit;-webkit-box-decoration-break:clone;box-decoration-break:clone;background:#c8dcec;text-decoration:none}.annotated-region ::selection{color:var(--ink);background:#c8dcec}:root[data-theme=dark] .annotation-selection{color:var(--ink);background:#354e64}:root[data-theme=dark] .annotated-region ::selection{color:var(--ink);background:#354e64}.annotation-indicator{color:var(--muted);flex-wrap:wrap;align-items:center;gap:6px 12px;margin:7px 0 12px;font-size:11px;display:flex}.annotation-indicator button{min-height:32px;color:var(--annotation-underline);font:inherit;background:0 0;border:0;align-items:center;gap:5px;padding:3px 0;display:inline-flex}.annotation-indicator button:hover{color:var(--ink)}.annotation-unlocated{font-size:11px;line-height:1.8}.selection-toolbar{z-index:40;color:#f6f6f6;isolation:isolate;background:#303133;border:0;border-radius:14px;grid-template-columns:repeat(3,minmax(0,1fr));height:76px;padding:6px;display:grid;position:fixed;box-shadow:0 6px 22px #0003}.selection-toolbar:after{content:"";z-index:-1;left:calc(var(--menu-arrow) - 5px);pointer-events:none;background:#303133;width:10px;height:10px;position:absolute;transform:rotate(45deg)}.selection-toolbar[data-placement=above]:after{bottom:-4px}.selection-toolbar[data-placement=below]:after{top:-4px}.selection-toolbar button{min-height:64px;color:inherit;background:0 0;border:0;border-radius:9px;flex-direction:column;justify-content:center;align-items:center;gap:6px;padding:7px 4px;font-size:12px;line-height:1.3;display:flex}.selection-toolbar button svg{stroke-width:1.6px}.selection-toolbar button:hover{background:#ffffff12}.selection-toolbar button:focus-visible{outline-offset:-2px;outline:2px solid #adcfed}.reading-sheet{inset:auto 0 var(--reading-sheet-bottom,0px);width:min(620px,100vw);max-width:100vw;max-height:min(680px,calc(var(--reading-viewport-height,100dvh) - 32px));background:var(--surface);color:var(--ink);overscroll-behavior:none;border:0;border-radius:18px 18px 0 0;margin:0 auto;padding:0;position:fixed;overflow:hidden;box-shadow:0 -6px 35px #00000018}.reading-sheet[open]{flex-direction:column;display:flex}.reading-sheet::backdrop{background:#18201d45}.reading-sheet--composer::backdrop{background:#18201d35}.reading-sheet-header{flex-shrink:0;justify-content:space-between;align-items:center;gap:12px;padding:14px 20px 8px;display:flex}.reading-sheet-header h2{letter-spacing:0;margin:0;font-size:16px;font-weight:600;line-height:1.6}.reading-sheet-header>div{align-items:center;gap:10px;display:flex}.reading-sheet:focus,.reading-sheet-header h2:focus{outline:none}.reading-sheet :is(button,a,summary):focus{box-shadow:none;outline:none}.reading-sheet[data-keyboard-navigation=true] :is(button,a,summary):focus-visible{outline:2px solid var(--focus);outline-offset:-2px;box-shadow:none}.reading-sheet--composer .reading-sheet-header{padding-top:9px;padding-bottom:5px}.reading-sheet--composer .reading-sheet-header h2{color:var(--muted);font-size:12px;font-weight:450}.sheet-close{min-width:32px;min-height:32px;color:var(--muted);background:0 0;border:0;border-radius:50%;place-items:center;padding:4px;display:grid}.sheet-close:hover{background:var(--hover)}.sheet-all-notes{color:var(--muted);background:0 0;border:0;min-height:32px;padding:4px;font-size:12px}.reading-sheet-content{padding:0 20px max(18px,env(safe-area-inset-bottom));overscroll-behavior:contain;min-height:0;overflow-y:auto}.thought-input-row{align-items:flex-end;gap:12px;display:flex}.thought-input-row textarea{min-width:0;min-height:50px;max-height:min(180px,calc(var(--reading-viewport-height,100dvh)*.35));background:var(--thought-input);color:var(--ink);font:16px/1.6 var(--font-sans);resize:none;border:0;border-radius:20px;outline:none;flex:1;margin:0;padding:12px 16px;display:block}.thought-input-row textarea::placeholder{color:var(--subtle)}.thought-input-row textarea:focus-visible{box-shadow:inset 0 0 0 1px #80afd52e}.thought-send{background:var(--thought-blue);color:#fff;border:0;border-radius:50%;flex-shrink:0;place-items:center;width:44px;height:44px;min-height:44px;margin-bottom:3px;display:grid}.thought-send:hover{filter:brightness(1.06)}.thought-send:disabled{background:var(--line);color:var(--surface);opacity:1;cursor:default;filter:none}.thought-reference{color:var(--muted);margin-top:13px;font-size:12px;line-height:1.8}.thought-reference summary{cursor:pointer;align-items:center;gap:8px;min-height:32px;list-style:none;display:flex}.thought-reference summary::-webkit-details-marker{display:none}.source-thoughts summary::-webkit-details-marker{display:none}.thought-reference summary>span:first-child{color:var(--subtle);flex-shrink:0}.thought-reference summary>span:nth-child(2){white-space:nowrap;text-overflow:ellipsis;min-width:0;overflow:hidden}.thought-reference summary>svg{margin-left:auto}.thought-reference[open] summary>svg{transform:rotate(180deg)}.thought-reference blockquote{white-space:pre-wrap;overflow-wrap:anywhere;border-left:2px solid var(--line);max-height:130px;margin:10px 0;padding:0 12px;font-size:13px;overflow:auto}.thought-reference-source{color:var(--subtle);overflow-wrap:anywhere;padding-left:14px;font-size:11px}.thoughts-summary{color:var(--subtle);justify-content:space-between;gap:12px;margin:3px 0 4px;font-size:11px;line-height:1.8;display:flex}.thought-list{flex-direction:column;display:flex}.thought-item{border-bottom:1px solid var(--soft-line);min-width:0;padding:18px 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