main.sources .subjects{gap:var(--s4);grid-template-columns:1fr;display:grid}main.sources .subject{color:inherit;text-decoration:none;display:block}main.sources .subjects .subject{width:100%}main.sources .subject:hover{border-color:var(--accent)}main.sources .counts{gap:var(--s2) var(--s5);margin:var(--s3) 0 0;flex-wrap:wrap;display:flex}main.sources .counts div{min-width:5rem}main.sources .counts dt{color:var(--ink-muted);font-size:.8rem}main.sources .counts dd{margin:0;font-size:1.2rem}main.sources .row{gap:var(--s2);flex-wrap:wrap;align-items:center;display:flex}main.sources .row input[type=text]{flex:14rem}main.sources .code{font-family:var(--mono);color:var(--ink-muted);min-width:3.2rem;font-size:.9rem}main.sources .icon{padding:4px 9px}main.sources .danger{color:var(--warn)}main.sources .ch{border-top:1px solid var(--rule);padding:var(--s3) 0}main.sources .ch>.row input[type=text]{font-weight:600}main.sources .tp-list{margin:var(--s2) 0 0;padding:0 0 0 var(--s5);list-style:none}main.sources .tp-list li{padding:3px 0}main.sources .add{margin-top:var(--s2);padding-left:var(--s5)}main.sources .add input[type=text]{flex:0 14rem}main.sources .add input.short{flex:0 0 6rem;width:6rem}main.sources .filters{gap:var(--s2);margin-bottom:var(--s3);flex-wrap:wrap;display:flex}main.sources .filters input[type=search]{flex:16rem}main.sources .bulk{gap:var(--s2);padding:var(--s2) var(--s3);background:var(--accent-ground);border:1px solid var(--accent-rule);border-radius:var(--radius);margin-bottom:var(--s3);flex-wrap:wrap;align-items:center;display:flex}main.sources .table-wrap{overflow-x:auto}main.sources table.list{border-collapse:collapse;width:100%;font-size:.92rem}main.sources table.list th,main.sources table.list td{text-align:left;border-bottom:1px solid var(--rule);vertical-align:top;padding:7px 8px}main.sources table.list th{color:var(--ink-muted);font-size:.82rem;font-weight:600}main.sources table.list td.n{text-align:right;white-space:nowrap}main.sources table.list tr.archived td{color:var(--ink-muted);text-decoration:line-through}main.sources .excerpt{text-overflow:ellipsis;-webkit-line-clamp:2;-webkit-box-orient:vertical;max-width:44ch;display:-webkit-box;overflow:hidden}main.sources .tag{background:var(--ground);border:1px solid var(--rule);white-space:nowrap;border-radius:999px;margin:1px 2px 1px 0;padding:0 8px;font-size:.8rem;display:inline-block}main.sources .tag button{color:var(--ink-muted);background:0 0;border:0;padding:0 0 0 4px;font-size:.85rem}main.sources .pager{gap:var(--s2);margin-top:var(--s3);align-items:center;display:flex}main.sources .editor{gap:var(--s4);grid-template-columns:minmax(0,1fr) minmax(0,1fr);display:grid}@media (max-width:860px){main.sources .editor{grid-template-columns:1fr}}main.sources .fields{gap:var(--s3);grid-template-columns:repeat(auto-fill,minmax(10rem,1fr));display:grid}main.sources .fields .field{margin:0}main.sources .fields input,main.sources .fields select{width:100%}main.sources .preview{background:var(--paper);border:1px solid var(--rule);border-radius:var(--radius);padding:var(--s3) var(--s4);min-height:4rem;overflow-x:auto}main.sources .save-bar{background:var(--ground);padding:var(--s3) 0;border-top:1px solid var(--rule);position:sticky;bottom:0}main.sources .ok{color:var(--correct)}main#main:has(.sources-explorer){width:100%}.drawer-open main#main:has(.sources-explorer){width:calc(100% - var(--drawer-width))}main.sources .sources-explorer{grid-template-columns:minmax(0, var(--topic-width,30fr)) 12px minmax(0, var(--question-width,70fr));align-items:stretch;gap:0;min-height:calc(100dvh - 80px);display:grid}main.sources .sources-tree,main.sources .question-preview{border:1px solid var(--rule);border-radius:var(--radius);background:var(--paper);min-width:0;height:calc(100dvh - 80px);padding:var(--s3);overflow:auto}main.sources .sources-tree{flex-direction:column;display:flex;overflow:hidden}main.sources .loading-questions{color:var(--ink-muted);place-items:center;display:grid}main.sources .explorer-heading{margin:0 0 var(--s3);padding-bottom:var(--s2);border-bottom:1px solid var(--rule);font-weight:600}main.sources .tree-chapter{margin-bottom:var(--s2)}main.sources .tree-chapter ul{padding:0 0 0 var(--s3);margin:2px 0 0;list-style:none}main.sources .tree-link{gap:var(--s2);border-radius:var(--radius);color:var(--ink);padding:6px 8px;font-size:.88rem;text-decoration:none;display:flex}main.sources .tree-link span{min-width:0}main.sources .tree-chapter-link{font-weight:600}main.sources .tree-topic-link{color:var(--ink-muted)}main.sources .tree-link:hover,main.sources .tree-link.active{color:var(--accent);background:var(--accent-ground)}main.sources .question-browser-list{gap:var(--s2);display:grid}main.sources .question-filters{margin:calc(-1 * var(--s2)) 0 var(--s3);flex-wrap:wrap;gap:4px;display:flex}main.sources .question-filters a{color:var(--ink-muted);border-radius:999px;align-items:center;gap:5px;padding:4px 7px;font-size:.76rem;text-decoration:none;display:inline-flex}main.sources .question-filters a:hover,main.sources .question-filters a[aria-current=page]{color:var(--accent);background:var(--accent-ground)}main.sources .question-filters span{font:.7rem var(--mono);opacity:.8}main.sources .browser-question{gap:var(--s2);padding:var(--s2);border:1px solid var(--rule);border-radius:var(--radius);color:var(--ink);grid-template-columns:3.5rem minmax(0,1fr);text-decoration:none;display:grid}main.sources .browser-question:hover,main.sources .browser-question.active{border-color:var(--accent);background:var(--accent-ground)}main.sources .browser-question .excerpt{max-width:none}main.sources .question-preview-content{min-height:0;font-family:var(--serif);font-size:1.05rem;line-height:1.55;overflow:auto}main.sources .question-reference{margin:calc(-1 * var(--s2)) 0 var(--s3);color:var(--ink-muted);font-size:.85rem}main.sources .question-preview-meta{gap:var(--s2);margin-top:var(--s3);display:flex}main.sources .question-preview{flex-direction:column;display:flex}main.sources .question-preview .explorer-heading{flex:none;align-items:center}main.sources .question-preview-content{flex:0 auto;max-height:38%}main.sources .question-metadata{flex:none;position:relative}main.sources .question-metadata summary{border:1px solid var(--rule);border-radius:var(--radius);width:28px;height:28px;color:var(--ink-muted);cursor:pointer;place-items:center;list-style:none;display:grid}main.sources .question-metadata summary::-webkit-details-marker{display:none}main.sources .question-metadata summary:hover,main.sources .question-metadata[open] summary{color:var(--accent);border-color:var(--accent);background:var(--accent-ground)}main.sources .question-metadata svg{fill:none;stroke:currentColor;stroke-width:1.4px;stroke-linecap:round;width:16px;height:16px}main.sources .question-metadata-popover{z-index:3;width:min(22rem,75vw);padding:var(--s3);border:1px solid var(--rule);border-radius:var(--radius);background:var(--paper);position:absolute;top:calc(100% + 6px);right:0;box-shadow:0 8px 24px #14223826}main.sources .question-metadata-popover>strong{margin-bottom:var(--s2);display:block}main.sources .question-metadata-popover dl{gap:5px var(--s2);grid-template-columns:6.5rem minmax(0,1fr);margin:0;font-size:.82rem;display:grid}main.sources .question-metadata-popover dt{color:var(--ink-muted)}main.sources .question-metadata-popover dd{overflow-wrap:anywhere;min-width:0;margin:0}main.sources .source-solution{min-height:12rem;margin-top:var(--s3);flex-direction:column;flex:1 1 0;display:flex}main.sources .source-solution .solution-tabs{margin:0 0 var(--s2);flex:none}main.sources .source-solution-panel{gap:var(--s2);flex-direction:column;flex:auto;min-height:0;display:flex}main.sources .source-solution-panel[hidden]{display:none}main.sources #source-answer{resize:vertical;width:100%;min-height:7rem;font-family:var(--mono);flex:auto}main.sources #source-answer[hidden],main.sources .source-answer-preview[hidden]{display:none}main.sources .source-answer-preview{min-height:7rem;padding:var(--s3);border:1px solid var(--rule);border-radius:var(--radius);background:var(--paper);font:1rem/1.55 var(--serif);flex:auto;overflow:auto}main.sources .source-solution-actions{align-items:center;gap:var(--s2);flex:none;display:flex}main.sources .source-solution .solution-drop{flex:auto;height:auto;min-height:8rem}main.sources .source-solution .upload-preview{align-items:center;gap:var(--s2);flex-wrap:wrap;flex:none;display:flex}main.sources .source-solution .upload-preview img{object-fit:contain;max-width:100%;max-height:12rem}main.sources .empty-questions{padding:var(--s2)}main.sources .explorer-heading{justify-content:space-between;align-items:baseline;gap:var(--s2);display:flex}main.sources .explorer-heading small,main.sources .tree-link small{color:var(--ink-muted);white-space:nowrap;font-size:.72rem;font-weight:500}main.sources .tree-link{align-items:baseline}main.sources .tree-link code{color:inherit;font:600 .75rem var(--mono);white-space:nowrap;flex:none}main.sources .tree-link>span{flex:auto}main.sources .tree-link small{margin-left:auto}main.sources .tree-topic-link{font-weight:400}main.sources .browser-question{grid-template-columns:3.5rem minmax(0,1fr) auto;align-items:start}main.sources .question-status{border:1px solid var(--rule);background:var(--ground);color:var(--ink-muted);font:600 .72rem var(--sans);white-space:nowrap;border-radius:999px;align-items:center;padding:2px 7px;display:inline-flex}main.sources .question-status.complete{border-color:var(--correct);background:var(--ground);color:var(--correct)}main.sources .question-status.partial{border-color:var(--accent-rule);background:var(--accent-ground);color:var(--accent)}main.sources .question-status.missing{border-color:var(--warn-rule);background:var(--warn-ground);color:var(--warn)}main.sources .question-preview-meta{align-items:center}main.sources .browser-selectors{align-items:stretch;gap:var(--s2);flex-direction:column;display:flex}main.sources .browser-select-field{gap:var(--s2);color:var(--ink-muted);font-size:.82rem;font-weight:600;display:grid}main.sources .browser-select-field select{width:100%;min-width:0;color:var(--ink);font-weight:400}main.sources .source-topic-tools{z-index:1;background:var(--paper);box-shadow:0 calc(-1 * var(--s3)) 0 var(--paper);flex:none;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:5px;display:grid;position:sticky;top:0}main.sources .source-topic-tools input{width:100%;min-width:0;padding:6px 7px}main.sources .source-topic-tools button{white-space:nowrap;padding:6px 7px;font-size:.74rem}main.sources .source-chapters{border-top:1px solid var(--rule);flex:none;overflow:visible}main.sources .source-chapter{border-bottom:1px solid var(--rule)}main.sources .source-chapter>summary{cursor:pointer;align-items:center;gap:6px;padding:8px 2px;font-size:.78rem;font-weight:600;list-style:none;display:flex}main.sources .source-chapter>summary::-webkit-details-marker{display:none}main.sources .source-chapter>summary:before{width:1em;height:1em;color:var(--ink-muted);content:"";clip-path:polygon(25% 10%,85% 50%,25% 90%);background:currentColor;flex:0 0 1em;transition:transform .15s}main.sources .source-chapter[open]>summary:before{transform:rotate(90deg)}main.sources .source-chapter>summary input{flex:none;margin:0}main.sources .source-chapter ul{margin:0;padding:0 0 6px 20px;list-style:none}main.sources .source-chapter li{padding:0;font-size:.75rem;display:block}main.sources .source-chapter li[hidden]{display:none}main.sources .source-topic{border-top:1px solid var(--rule)}main.sources .source-topic>summary{cursor:pointer;align-items:center;gap:6px;padding:6px 2px;list-style:none;display:flex}main.sources .source-topic>summary::-webkit-details-marker{display:none}main.sources .source-topic>summary:before{width:1em;height:1em;color:var(--ink-muted);content:"";clip-path:polygon(25% 10%,85% 50%,25% 90%);background:currentColor;flex:0 0 1em;transition:transform .15s}main.sources .source-topic[open]>summary:before{transform:rotate(90deg)}main.sources .source-topic>summary input{flex:none;margin:0}main.sources .source-topic>summary label{cursor:pointer;flex:auto;min-width:0;line-height:1.35}main.sources .source-topic-questions{padding:6px 4px 10px 24px;overflow-x:auto}main.sources .browser-question-list{grid-template-columns:repeat(10,32px);align-content:start;gap:6px;display:grid}main.sources .browser-question{border:1px solid var(--rule);background:var(--paper);width:32px;height:32px;color:var(--ink);border-radius:7px;grid-template-columns:1fr;place-items:center;padding:0;text-decoration:none;display:grid}main.sources .browser-question.complete{border-color:var(--correct);background:color-mix(in srgb, var(--correct) 12%, var(--paper));color:var(--correct)}main.sources .browser-question:hover,main.sources .browser-question.active,main.sources .browser-question:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}main.sources .browser-question-number{color:inherit;font:600 .9rem var(--sans)}@media (max-width:1000px){main.sources .sources-explorer{grid-template-columns:minmax(0, var(--topic-width,30fr)) 12px minmax(0, var(--question-width,70fr));min-height:0}main.sources .sources-tree,main.sources .question-preview{height:calc(100dvh - 80px)}}@media (max-width:640px){main.sources .sources-explorer{grid-template-columns:1fr}main.sources .sources-tree{height:45dvh}main.sources .question-preview{grid-column:auto}}main.sources .source-solution [data-solution-tab]{border-radius:6px;place-items:center;width:36px;height:36px;padding:6px;display:grid}main.sources .source-solution [data-solution-tab] svg{fill:none;stroke:currentColor;stroke-width:1.6px;stroke-linecap:round;stroke-linejoin:round;width:22px;height:22px}main.sources .source-topic-pending{min-height:32px}main.sources .source-loading-placeholder{border-radius:var(--radius);background:var(--ground);width:min(180px,100%);height:24px;animation:1.2s ease-in-out infinite alternate source-loading-pulse;display:block}main.sources .source-retry{padding:4px 8px;font-size:.8rem}@keyframes source-loading-pulse{to{opacity:.45}}@media (prefers-reduced-motion:reduce){main.sources .source-loading-placeholder{animation:none}}main.sources .source-solution{border-top:1px solid var(--rule);padding-top:0}main.sources .source-solution-actions{justify-content:flex-end}main.sources .source-solution-actions[hidden],main.sources .source-solution-actions #source-answer-status:empty{display:none}main.sources .source-solution-actions #save-source-answer{order:1}main.sources .question-heading-label{align-items:center;gap:var(--s2);display:flex}main.sources .question-metadata-popover{left:0;right:auto}main.sources .source-done-button{width:28px;height:28px;color:var(--ink-muted);place-items:center;padding:4px;display:grid}main.sources .source-done-button svg{fill:none;stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;width:18px;height:18px}main.sources .source-done-button[aria-pressed=true]{color:var(--correct);border-color:var(--correct);background:color-mix(in srgb, var(--correct) 12%, var(--paper))}main.sources .browser-question:not(.complete):hover,main.sources .browser-question:not(.complete).active{background:var(--paper);color:var(--ink)}main.sources .source-chapters{min-height:0;margin:8px calc(-1 * var(--s3)) calc(-1 * var(--s3));padding:0 var(--s3) var(--s3);flex:1;overflow-y:auto}main.sources .source-divider{cursor:col-resize;touch-action:none;outline-offset:-2px;position:relative}main.sources .source-divider:after{content:"";background:var(--rule);border-radius:2px;width:2px;position:absolute;top:0;bottom:0;left:5px}main.sources .source-divider:hover:after,main.sources .source-divider:focus-visible:after,main.sources .source-divider.dragging:after{background:var(--accent);width:4px;left:4px}@media (max-width:640px){main.sources .source-divider{display:none}main.sources .sources-explorer{gap:var(--s3)}}main.sources .source-solution .solution-tabs{gap:4px;padding:4px 0}main.sources .source-solution [data-solution-tab]:hover,main.sources .source-solution [data-solution-tab][aria-selected=true]{background:var(--accent-ground)}main.sources .source-solution [data-solution-tab]:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}main.sources .source-solution{border:1px solid var(--rule);background:var(--paper);border-radius:6px;padding:0}main.sources .source-solution .editor-toolbar{background:var(--ground);flex-wrap:wrap;gap:0;margin:0;padding:0 8px}main.sources .editor-toolbar [data-solution-tab]{border-radius:6px 6px 0 0;width:auto;height:44px;padding:0 16px;font-size:14px}main.sources .editor-toolbar [data-solution-tab][aria-selected=true]{background:var(--paper);border:1px solid var(--rule);border-bottom-color:var(--paper);color:var(--ink);margin-bottom:-1px}main.sources .editor-formatting{align-items:center;gap:2px;margin-left:auto;display:flex}main.sources .editor-formatting[hidden],main.sources .editor-footer[hidden]{display:none}main.sources .editor-formatting button{border-radius:4px;width:30px;height:32px;padding:0;font-size:16px}main.sources .editor-formatting button:hover{background:var(--accent-ground)}main.sources #source-write-panel{padding:10px}main.sources #source-answer{font:14px/1.5 var(--sans);padding:10px}main.sources .editor-footer{color:var(--ink-muted);flex-wrap:wrap;align-items:center;gap:16px;font-size:12px;display:flex}main.sources .editor-footer button{color:inherit;font:inherit;cursor:pointer;background:0 0;border:0;padding:4px 0}main.sources #source-answer-preview{order:-1}main.sources #source-upload-panel,main.sources #source-official-panel{padding:10px}main.sources .question-section-tabs{flex-wrap:wrap;gap:2px;min-width:0;display:flex}main.sources .question-section-tabs button{color:var(--ink-muted);background:0 0;border:1px solid #0000;border-radius:6px 6px 0 0;align-items:center;gap:6px;padding:10px 12px;font-size:14px;font-weight:400;display:flex}main.sources .question-section-tabs button[aria-selected=true]{border-color:var(--rule);border-bottom-color:var(--paper);background:var(--paper);color:var(--ink)}main.sources .tab-count{background:var(--ground);border-radius:12px;padding:0 6px;font-size:12px}main.sources #source-answer{flex:none;height:160px;min-height:120px}main.sources #source-answer-preview{flex:none;min-height:160px;max-height:320px}main.sources .source-solution{flex:1 1 0;min-height:16rem}main.sources #source-write-panel{flex:auto}main.sources #source-answer{flex:auto;height:auto}main.sources #source-answer-preview{flex:auto;max-height:none}main.sources .source-solution-actions{background:var(--paper);border-radius:0 0 6px 6px;justify-content:flex-end;margin-top:auto;padding:10px;position:sticky;bottom:0}main.sources .editor-toolbar [data-solution-tab][aria-selected=true]{z-index:1;background:var(--paper);border-bottom:0;height:45px;margin-bottom:-1px;position:relative}main.sources .editor-toolbar [data-solution-tab][aria-selected=true]:after{content:"";background:var(--paper);height:2px;position:absolute;bottom:-1px;left:0;right:0}main.sources .question-preview-content[hidden],main.sources .question-metadata summary{display:none}main.sources .question-metadata[open] .question-metadata-popover{z-index:5;top:48px;left:0;right:auto}main.sources #source-upload-panel{flex:none;padding:0 10px}main.sources #source-solution-drop{display:none}main.sources .attachment-image{place-items:center;width:100%;height:240px;display:grid;overflow:auto}main.sources .attachment-image img{object-fit:contain;max-width:220px;max-height:220px}main.sources #source-upload-status:empty{display:none}main.sources .question-info-content{padding:12px 0;font-size:14px}main.sources .question-info-content dl{grid-template-columns:110px minmax(0,1fr);gap:10px 16px;display:grid}main.sources .question-info-content dt{color:var(--ink-muted)}main.sources .question-info-content dd{overflow-wrap:anywhere;margin:0}main.sources #source-info-panel[hidden]{display:none}main.sources .source-topic-questions{overflow-x:hidden;container-type:inline-size}main.sources .browser-question-list{grid-template-columns:repeat(10,minmax(0,32px));max-width:374px}@container (max-width:373px){main.sources .browser-question-list{grid-template-columns:repeat(9,minmax(0,32px))}}@container (max-width:335px){main.sources .browser-question-list{grid-template-columns:repeat(8,minmax(0,32px))}}@container (max-width:297px){main.sources .browser-question-list{grid-template-columns:repeat(7,minmax(0,32px))}}@container (max-width:259px){main.sources .browser-question-list{grid-template-columns:repeat(6,minmax(0,32px))}}@container (max-width:221px){main.sources .browser-question-list{grid-template-columns:repeat(5,minmax(0,32px))}}main.sources .browser-question-list .browser-question{width:100%;min-width:0}main.sources .source-solution[hidden],main.sources .editor-toolbar[hidden]{display:none}main.sources .source-solution.official-only{border:0;margin-top:0}main.sources .official-only #source-official-panel{padding:0}main.sources .official-only .source-answer-preview{border:0;padding:0}main.sources .editor-toolbar [data-solution-tab]{height:34px;padding:0 var(--tab-padding-x);font-size:var(--tab-font-size)}main.sources .editor-toolbar [data-solution-tab][aria-selected=true]{height:var(--tab-height)}main.sources .editor-formatting button{width:28px;height:28px;font-size:14px}main.sources #source-answer{resize:vertical;width:100%;max-width:100%}main.sources .source-solution .editor-toolbar{align-items:stretch;padding-left:0}main.sources .editor-toolbar [data-solution-tab]:first-child{margin-left:-1px}main.sources .editor-toolbar [data-solution-tab][aria-selected=true]{border-top:1px solid var(--rule);border-left:1px solid var(--rule);border-right:1px solid var(--rule);height:36px;margin-top:-1px}main.sources .editor-formatting{align-self:center}main.sources .question-preview>.explorer-heading{margin:calc(-1 * var(--s3)) calc(-1 * var(--s3)) var(--s3);background:var(--ground);min-height:35px;padding:0 8px 0 0}main.sources .question-section-tabs{align-items:stretch;gap:0}main.sources .question-section-tabs button{height:34px;padding:0 var(--tab-padding-x);font-size:var(--tab-font-size)}main.sources .question-section-tabs button[aria-selected=true]{z-index:1;border-bottom:0;height:36px;margin:-1px 0 -1px -1px;position:relative}main.sources .question-section-tabs button[aria-selected=true]:after{content:"";background:var(--paper);height:2px;position:absolute;bottom:-1px;left:0;right:0}main.sources .question-section-tabs button:hover{color:var(--ink)}main.sources .editor-toolbar [data-solution-tab]{width:var(--tab-width);height:var(--tab-height);flex:0 0 var(--tab-width);box-sizing:border-box;font-weight:500}main.sources .editor-toolbar [data-solution-tab][aria-selected=true]{height:var(--tab-height);margin-top:0}main.sources .editor-footer #source-attach{border-radius:4px;place-items:center;width:28px;height:28px;display:grid}main.sources .editor-footer #source-attach:hover{background:var(--accent-ground)}main.sources .question-section-tabs button{width:var(--tab-width);height:var(--tab-height);flex:0 0 var(--tab-width);box-sizing:border-box;justify-content:center;padding:0 6px;font-weight:500}main.sources .question-section-tabs button[aria-selected=true]{height:var(--tab-height);margin-top:0}main.sources .editor-toolbar [data-solution-tab][aria-selected=true],main.sources .question-section-tabs button[aria-selected=true]{border-top:0;border-radius:5px 5px 0 0}main.sources #source-write-panel{padding-bottom:4px}main.sources .source-solution-actions{margin-top:0;padding-top:8px}main.sources #source-upload-panel:has(.upload-preview:empty){display:none}main.sources .question-preview:has(.question-preview-content:not([hidden])) .question-preview-content{flex:3 1 0;min-height:0;max-height:none;overflow-y:auto}main.sources .question-preview:has(.question-preview-content:not([hidden])) .source-solution{flex:7 1 0;min-height:0;margin-top:0}main.sources .browser-question.partial{position:relative;overflow:hidden}main.sources .browser-question.partial:after{content:"";width:var(--completion);background:var(--correct);height:4px;position:absolute;bottom:0;left:0}main.sources .question-part{grid-template-columns:20px minmax(0,1fr);align-items:start;gap:8px;padding:6px 0;display:grid}main.sources .question-part p{margin:0}main.sources .question-part select{font:12px var(--sans);padding:4px}main.sources .part-picker{border-bottom:1px solid var(--rule);flex-wrap:wrap;gap:4px;padding:6px;display:flex}main.sources .part-picker button{padding:4px 10px}main.sources .part-picker button[aria-pressed=true]{border-color:var(--accent);color:var(--accent);background:var(--accent-ground)}@media (max-width:640px){main.sources .question-part{grid-template-columns:20px minmax(0,1fr)}main.sources .question-part select{grid-column:2;justify-self:start}}main.sources .question-preview{background:0 0;border:0;gap:12px;padding:0;overflow:hidden}main.sources .question-card{min-height:0;padding:var(--s3);border:1px solid var(--rule);border-radius:var(--radius);background:var(--paper);flex-direction:column;flex:1;display:flex;overflow:hidden}main.sources .question-card>.explorer-heading{margin:calc(-1 * var(--s3)) calc(-1 * var(--s3)) var(--s3);background:var(--ground);flex:none;min-height:35px;padding:0 8px 0 0}main.sources .question-preview:has(.question-preview-content:not([hidden])) .question-preview-content{flex:1}main.sources .question-card #source-info-panel,main.sources .question-card #source-official-panel{min-height:0;overflow-y:auto}main.sources .question-card #source-official-panel{padding:0}main.sources .question-card #source-official-panel article{border:0;padding:0}main.sources .review-solutions h3{margin:0 0 12px;font-size:1rem}main.sources .review-part{margin-bottom:16px}main.sources .review-part h4{margin:0 0 6px;font-size:.9rem}main.sources .review-solutions .source-answer-preview,main.sources .review-reference .source-answer-preview{min-height:0}main.sources .review-reference{border-top:1px solid var(--rule);padding:12px 0}main.sources .review-reference summary{cursor:pointer;font-weight:600}main.sources .review-notes{gap:8px;padding-bottom:8px;display:grid}main.sources #source-review-notes{resize:vertical;width:100%;min-height:100px}main.sources .review-actions{justify-content:flex-end;align-items:center;gap:12px;display:flex}main.sources .review-image{place-items:center;min-height:240px;display:grid;overflow:auto}main.sources .review-image img{max-width:220px;max-height:220px}main.sources .question-card.question-only{flex:var(--question-height,30) 1 0}main.sources .question-preview:has(.question-preview-content:not([hidden])) .source-solution{flex:var(--solution-height,70) 1 0}main.sources .question-solution-divider{cursor:row-resize;touch-action:none;flex:0 0 10px;margin:-8px 0;position:relative}main.sources .question-solution-divider:after{content:"";background:var(--rule);height:2px;position:absolute;top:4px;left:0;right:0}main.sources .question-solution-divider:hover:after,main.sources .question-solution-divider:focus-visible:after{background:var(--accent)}main.sources .question-solution-divider[hidden],main.sources .part-picker[hidden]{display:none}main.sources .question-preview>.part-picker{border:0;flex:none;padding:0}main.sources .source-divider,main.sources .question-solution-divider{cursor:grab}main.sources .source-divider.dragging,main.sources .question-solution-divider.dragging{cursor:grabbing}main.sources .source-divider:after,main.sources .source-divider:hover:after,main.sources .source-divider:focus-visible:after,main.sources .source-divider.dragging:after{background:var(--ink-muted);width:4px;height:4px;box-shadow:0 -7px 0 var(--ink-muted), 0 7px 0 var(--ink-muted);border-radius:50%;top:50%;bottom:auto;left:4px;transform:translateY(-50%)}main.sources .question-solution-divider:after,main.sources .question-solution-divider:hover:after,main.sources .question-solution-divider:focus-visible:after{background:var(--ink-muted);width:4px;height:4px;box-shadow:-7px 0 0 var(--ink-muted), 7px 0 0 var(--ink-muted);border-radius:50%;top:3px;left:50%;right:auto;transform:translate(-50%)}main.sources .editor-formatting #source-math-toggle{white-space:nowrap;width:auto;padding:0 10px}main.sources .math-options{border-bottom:1px solid var(--rule);background:var(--paper);flex:none;max-height:240px;padding:8px;overflow-y:auto}main.sources .math-options[hidden]{display:none}main.sources .math-options summary{cursor:pointer;padding:7px 4px;font-size:13px;font-weight:600}main.sources .math-option-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:6px;padding:4px 0 10px;display:grid}main.sources .math-option-grid button{text-align:left;flex-direction:column;gap:4px;min-width:0;padding:8px;display:flex}main.sources .math-option-grid code{color:var(--ink-muted);overflow-wrap:anywhere;white-space:normal;font-size:11px}main.sources .question-empty-state{text-align:center;min-height:12rem;color:var(--ink-muted);flex:1;place-items:center;padding:24px;display:grid}main.sources .question-empty-state p{margin:0;font-size:15px}main.sources .question-section-tabs button,main.sources .editor-toolbar [data-solution-tab]{width:var(--tab-width);flex:0 0 var(--tab-width);height:var(--tab-height);padding:0 var(--tab-padding-x);color:var(--ink-muted);font-size:var(--tab-font-size);box-sizing:border-box;background:0 0;border:0;border-radius:0;justify-content:center;align-items:center;margin:0;font-weight:500;display:flex}main.sources .question-section-tabs button:first-child,main.sources .editor-toolbar [data-solution-tab]:first-child{margin-left:-1px}main.sources .question-section-tabs button[aria-selected=true],main.sources .editor-toolbar [data-solution-tab][aria-selected=true]{z-index:1;height:var(--tab-height);border:1px solid var(--rule);background:var(--paper);color:var(--ink);border-top:0;border-bottom:0;border-radius:5px 5px 0 0;margin-top:0;margin-bottom:-1px;position:relative}main.sources #source-answer:focus{outline:2px solid var(--accent);outline-offset:-2px}main.sources .part-picker button[data-status=draft]{color:#754c00;background:#fff8c5;border-color:#bf8700}main.sources .part-picker button[data-status=solved]{background:color-mix(in srgb, var(--correct) 12%, var(--paper));border-color:var(--correct);color:var(--correct)}main.sources .part-picker button[aria-pressed=true]{outline:2px solid var(--accent);outline-offset:-2px}main.sources .review-comparison{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px;display:grid}main.sources .review-comparison>div{border:1px solid var(--rule);border-radius:var(--radius);min-width:0;padding:12px}main.sources .review-comparison h4{margin:0 0 10px;font-size:13px}main.sources .review-part{border-bottom:1px solid var(--rule);padding-bottom:16px}main.sources .review-shared{margin-bottom:20px}@media (max-width:640px){main.sources .review-comparison{grid-template-columns:1fr}}main.sources .write-tools{border:1px solid var(--rule);border-radius:var(--radius);background:var(--ground);flex:none;overflow:hidden}main.sources .write-tools[hidden]{display:none}main.sources .write-tools .editor-formatting{flex-wrap:wrap;justify-content:flex-start;gap:4px;margin:0;padding:6px;display:flex}main.sources .write-tools .math-options{border-top:1px solid var(--rule);border-bottom:0;max-height:130px;padding:6px 10px}main.sources .write-tools .math-options summary{padding:5px 4px}main.sources .review-question,main.sources .review-question-part{font:1rem/1.55 var(--serif);margin:0 0 16px}main.sources .review-answer-box{border:1px solid var(--rule);border-radius:var(--radius);background:var(--paper);overflow:hidden}main.sources .review-preview-heading{height:var(--tab-height);padding:0 var(--tab-padding-x);border-bottom:1px solid var(--rule);background:var(--ground);font-size:var(--tab-font-size);align-items:center;font-weight:500;display:flex}main.sources .review-answer-box .review-comparison{grid-template-columns:1fr;gap:0}main.sources .review-answer-box .review-comparison>div{border:0;border-radius:0;padding:12px}main.sources .review-answer-box .review-comparison>div+div{border-top:1px solid var(--rule)}main.sources #source-answer-preview{padding:10px}main.sources #source-answer-preview>:first-child{margin-top:0}main.sources #source-answer-preview>:last-child{margin-bottom:0}main.sources .source-question-filters{flex:none;gap:6px;padding:8px 0;display:grid}main.sources .source-question-filters label{color:var(--ink-muted);grid-template-columns:72px minmax(0,1fr);align-items:center;gap:6px;font-size:12px;display:grid}main.sources .source-question-filters select{width:100%;min-width:0;padding:5px 6px;font-size:12px}main.sources .write-tools .math-options{flex-wrap:wrap;align-items:center;gap:0;max-height:130px;display:flex}main.sources .write-tools .math-options[hidden]{display:none}main.sources .math-options>button{background:0 0;border:0;min-width:32px;padding:4px 10px;font-size:16px;position:relative}main.sources .math-options>button+button:before{content:"|";color:var(--ink-muted);font-size:13px;position:absolute;left:-2px}main.sources .math-options>button:hover{background:var(--accent-ground);color:var(--accent)}main.sources .review-answer-box .review-preview-heading{height:auto;min-height:var(--tab-height);padding:10px 12px}main.sources .review-preview-heading .review-question-part{margin:0}main.sources .review-answer-box .review-comparison{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}main.sources .review-answer-box .review-comparison>div+div{border-top:0;border-left:1px solid var(--rule)}@media (max-width:640px){main.sources .review-answer-box .review-comparison{grid-template-columns:1fr}main.sources .review-answer-box .review-comparison>div+div{border-left:0;border-top:1px solid var(--rule)}}main.sources .write-tools .math-options{background:var(--paper);border-top:0}main.sources .review-answer-box .review-preview-heading{min-height:0;padding:6px 12px}main.sources .review-question-part>:first-child{margin-top:0}main.sources .review-question-part>:last-child{margin-bottom:0}main.sources .review-comparison .source-answer-preview{min-height:0}main.sources .review-comparison .source-answer-preview>:first-child{margin-top:0}main.sources .review-comparison .source-answer-preview>:last-child{margin-bottom:0}main.sources .review-preview-heading{justify-content:space-between;gap:12px}main.sources .review-preview-heading .review-question-part{flex:1;min-width:0}main.sources .part-difficulty{flex:none;width:92px;padding:3px 5px;font-size:12px}main.sources .review-part-number{font:1rem/1.55 var(--serif);align-self:flex-start}main.sources .part-difficulty:has(option[value="1"]:checked){color:#116329;background:#dafbe1;border-color:#1a7f37}main.sources .part-difficulty:has(option[value="3"]:checked){color:#754c00;background:#fff8c5;border-color:#bf8700}main.sources .part-difficulty:has(option[value="5"]:checked){color:#a40e26;background:#ffebe9;border-color:#cf222e}main.sources .part-difficulty option[value="1"]{color:#116329;background:#dafbe1}main.sources .part-difficulty option[value="3"]{color:#754c00;background:#fff8c5}main.sources .part-difficulty option[value="5"]{color:#a40e26;background:#ffebe9}main.sources .review-part:last-child{border-bottom:0;margin-bottom:0;padding-bottom:0}main.sources .part-difficulty option[value=""]{color:var(--ink);background:#fff}main.sources .part-difficulty:has(option[value=""]:checked){color:var(--ink);background:#fff}main.sources .question-info-question{font:1rem/1.55 var(--serif);margin-bottom:20px}main.sources .question-instruction{margin:0 0 .75em}main#main:has(.discipline-workspace){width:100%}.drawer-open main#main:has(.discipline-workspace){width:calc(100% - var(--drawer-width))}main.sources .discipline-tabs{gap:5px;margin-bottom:12px;display:flex}main.sources .discipline-tabs [role=tab]{border:1px solid var(--rule);border-radius:var(--radius);background:var(--ground);width:auto;min-width:0;height:auto;color:var(--ink);flex:none;padding:6px 10px}main.sources .discipline-tabs [aria-selected=true]{background:var(--accent-ground);color:var(--accent);border-color:var(--accent);outline:2px solid var(--accent);outline-offset:-2px}main.sources .discipline-workspace .sources-explorer{min-height:calc(100dvh - 80px)}main.sources .discipline-workspace .sources-tree,main.sources .discipline-workspace .question-preview{height:calc(100dvh - 80px)}main.sources .discipline-panel{border:1px solid var(--rule);border-radius:var(--radius);background:var(--paper);padding:20px}main.sources .discipline-stats{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;display:grid}main.sources .discipline-stats>div{border:1px solid var(--rule);border-radius:var(--radius);gap:4px;padding:16px;display:grid}main.sources .discipline-stats strong{font-size:2rem}main.sources .discipline-panel progress{width:100%;accent-color:var(--correct)}main.sources .question-preview>.discipline-tabs{flex:none}main.sources .question-preview>.discipline-panel{min-height:0;overflow:auto}main.sources .question-preview>.discipline-panel:has(.concept-reader){flex:1}main.sources .concept-reader{max-width:none;font:1.05rem/1.7 var(--serif);overflow-wrap:anywhere;margin:0}main.sources .concept-chapter+.concept-chapter{border-top:1px solid var(--rule);margin-top:48px;padding-top:24px}main.sources .concept-topic{margin:32px 0}main.sources .concept-reader h2,main.sources .concept-reader h3{font-family:var(--sans);line-height:1.35}main.sources .concept-callout{border:1px solid var(--rule);border-left:3px solid var(--accent);border-radius:var(--radius);margin:20px 0;padding:16px 20px}main.sources .concept-callout-title{font-weight:600}main.sources .concept-callout-title p{margin-top:0}main.sources .concept-table{overflow-x:auto}main.sources .concept-table td{border:1px solid var(--rule);padding:6px 12px}main.sources .concept-table td p{margin:0}main.sources .concept-reader mjx-container[display=true]{padding:4px 0;overflow:auto hidden}main.sources .concept-index-chapter summary{cursor:pointer;padding:8px 4px;font-weight:600}main.sources .concept-index-chapter ul{margin:0;padding-left:16px;list-style:none}main.sources .concept-index-chapter a{color:var(--ink);padding:5px 4px;text-decoration:none;display:inline-block}main.sources .concept-index-chapter a:hover,main.sources .concept-index-chapter a[aria-current]{color:var(--accent);background:var(--accent-ground)}main.sources .discipline-panel:has(.concept-reader){padding:12px}main.sources .concept-chapter>h2{text-align:center}main.sources .question-preview>.discipline-panel:has(.insights){flex:1}main.sources .insights h3{margin:24px 0 8px;font-size:1rem}main.sources .insight-hero{border:1px solid var(--rule);border-radius:var(--radius);background:var(--ground);align-items:center;gap:20px;padding:16px;display:flex}main.sources .confidence-score strong{font-variant-numeric:tabular-nums;font-size:3rem;line-height:1}main.sources .confidence-score span{color:var(--ink-muted);margin-left:4px}main.sources .insight-hero>div:last-child{flex:1;min-width:0}main.sources .confidence-label{flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 8px;display:flex}main.sources .insight-hero details{margin-top:8px}main.sources .confidence-chip{white-space:nowrap;border:1px solid;border-radius:999px;align-items:center;gap:4px;padding:1px 8px;font-size:.8rem;display:inline-flex}main.sources .confidence-chip.strong{color:var(--correct)}main.sources .confidence-chip.building{color:var(--partial)}main.sources .confidence-chip.weak{color:var(--wrong)}main.sources .confidence-chip span{font-size:.6rem}main.sources .meter{background:var(--rule);vertical-align:middle;border-radius:4px;width:100%;max-width:160px;height:8px;display:inline-block;overflow:hidden}main.sources .meter.large{max-width:none;height:10px}main.sources .meter>span{background:var(--accent);border-radius:4px;height:100%;display:block}main.sources .insight-tiles{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:16px;display:grid}main.sources .insight-tile{border:1px solid var(--rule);border-radius:var(--radius);gap:2px;padding:12px 14px;display:grid}main.sources .insight-tile strong{font-variant-numeric:tabular-nums;font-size:1.5rem}main.sources .insight-tile strong small{color:var(--ink-muted);font-size:.9rem;font-weight:400}main.sources .insight-tile>span{font-weight:600}main.sources .insight-tile>small{color:var(--ink-muted)}main.sources .insight-list{gap:6px;margin:0;padding-left:20px;display:grid}main.sources .insight-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-top:16px;display:grid}main.sources .insight-chart{border:1px solid var(--rule);border-radius:var(--radius);margin:0;padding:12px 14px}main.sources .insight-chart figcaption{margin-bottom:8px;font-weight:600}main.sources .columns{border-bottom:1px solid var(--rule);align-items:flex-end;gap:2px;height:96px;display:flex}main.sources .column{cursor:default;flex:1;align-items:flex-end;max-width:32px;height:100%;display:flex}main.sources .column>span{background:var(--accent);border-radius:4px 4px 0 0;width:100%}main.sources .column:hover>span{background:var(--primary)}main.sources .columns-axis{color:var(--ink-muted);justify-content:space-between;margin-top:4px;font-size:.75rem;display:flex}main.sources .difficulty-bars{gap:8px;display:grid}main.sources .difficulty-bars>div{grid-template-columns:minmax(70px,30%) 1fr auto;align-items:center;gap:8px;display:grid}main.sources .difficulty-bars .meter{max-width:none}main.sources .difficulty-bars .num{font-variant-numeric:tabular-nums;color:var(--ink-muted);font-size:.85rem}main.sources .insight-topics{gap:8px;margin:0;padding-left:20px;display:grid}main.sources .insight-topics small{color:var(--ink-muted);display:block}main.sources .insights td .meter{max-width:72px}main.sources .insights td:nth-child(3){white-space:nowrap;padding-right:16px}@media (max-width:600px){main.sources .insight-hero{flex-direction:column;align-items:flex-start}main.sources .insight-tiles{grid-template-columns:repeat(2,minmax(0,1fr))}}