/* The practice workspace shares the reference application's colors and typography. */
textarea{font:inherit;color:var(--ink);padding:12px;border:1px solid #aab8cb;border-radius:5px;resize:vertical;max-width:100%}button:disabled{cursor:default;opacity:.45}.small{font-size:12px}.practice-heading{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}.practice-heading h1{font-size:23px;margin:0 0 3px}.practice-heading p{margin:0;color:#5d6b7f}.practice-heading-actions{display:flex;gap:8px}.practice-workspace{display:grid;grid-template-columns:230px minmax(360px,1fr) 260px;gap:16px;align-items:start}.practice-sidebar,.practice-results,.selection-tray,.exercise-board,.exercise-sheet,.exercise-knowledge{background:#fff;border:1px solid var(--line);border-radius:7px;min-width:0}.practice-directory>summary{font-weight:650;padding:14px 16px;border-bottom:1px solid var(--line);cursor:pointer}.practice-book-list{padding:8px}.practice-book-list a{display:flex;align-items:start;justify-content:space-between;gap:8px;color:#43516a;padding:10px 9px;font-size:13px;border-radius:4px;line-height:1.5}.practice-book-list a small{white-space:nowrap;color:#667388}.practice-book-list a:hover,.practice-book-list a.current{background:var(--soft);color:#194b91;text-decoration:none}.practice-book-list .book-name{font-weight:650;border-top:1px solid var(--line);margin-top:5px;padding-top:14px}.practice-book-list details{margin:3px 0 3px 9px}.practice-book-list details summary{font-size:13px;padding:8px 4px;cursor:pointer;color:#34445c}.practice-book-list details a{font-size:12px;border-left:1px solid #ced9e8;border-radius:0;padding:8px 8px;margin-left:5px}.practice-filterbar{padding:16px;border-bottom:1px solid var(--line)}#practice-search{display:flex;gap:8px;margin-bottom:12px}#practice-query{width:100%;background:#f8fafc}.practice-selects{display:flex;flex-wrap:wrap;align-items:end;gap:10px}.practice-selects label{display:flex;flex-direction:column;gap:3px;font-size:11px;color:#58677b}.practice-selects label:nth-child(2){flex:1;min-width:100px}.practice-selects select{max-width:220px;width:100%;font-size:12px;padding:5px 6px;color:var(--ink)}.practice-resultbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--line);background:#f8fafc;gap:12px}.practice-resultbar div{display:flex;flex-direction:column;min-width:0}.practice-resultbar strong{font-size:14px}.practice-resultbar span{font-size:12px;color:#58677b}.practice-resultbar button{flex-shrink:0;font-size:12px}.practice-row{display:flex;gap:12px;padding:19px 18px;border-bottom:1px solid var(--line)}.practice-row:hover{background:#fbfcff}.question-check input{width:17px;height:17px;min-height:0;margin:3px 0;accent-color:var(--blue)}.question-check{padding:2px;cursor:pointer}.practice-row-content{min-width:0;flex:1}.question-meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center;font-size:11px;color:#59697f;margin-bottom:10px}.difficulty{border:1px solid #c6d5e9;background:#f1f6fd;padding:1px 7px;border-radius:4px;color:#295482}.question-text{font-size:16px;line-height:1.9;overflow-wrap:anywhere;color:#202d40}.question-text.clamped{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;max-height:115px;font-size:15px}.question-row-bottom{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-top:12px}.question-row-bottom span{font-size:11px;color:#65738a}.question-row-bottom button{font-size:12px;min-height:30px;padding:3px 8px;flex-shrink:0}.practice-pagination{display:flex;justify-content:flex-end;align-items:center;gap:8px;padding:16px}.practice-pagination span{margin-right:auto;font-size:12px;color:#58677b}.selection-tray{padding:16px;position:sticky;top:14px}.tray-heading{display:flex;justify-content:space-between;gap:8px;align-items:center}.tray-heading h2{font-size:15px;margin:0}.tray-heading h2 span{font-size:13px;margin-left:6px;color:var(--blue)}.tray-heading button{font-size:12px;padding:3px 8px;min-height:28px}.basket-list{max-height:330px;overflow:auto}.basket-list>div{display:flex;align-items:center;gap:8px;justify-content:space-between;padding:9px 0;border-bottom:1px solid var(--line);font-size:12px}.basket-list small{display:block;color:#62718a;padding-left:17px}.basket-list button{border:0;padding:0 7px;font-size:18px;min-height:26px}.basket-empty{text-align:center;padding:28px 0;color:#69788e;font-size:13px;line-height:1.9}.tray-actions{display:flex;flex-direction:column;gap:8px;margin-top:18px}.tray-actions button{min-height:39px}.selection-tray>p:last-child{margin-bottom:0}.katex{font-size:1.1em!important}.katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0}.inline-figure{max-height:55px;max-width:160px;vertical-align:middle;object-fit:contain}.question-figure{margin:20px 0;max-width:100%}.question-figure img{max-width:100%;max-height:360px;object-fit:contain}.question-figure figcaption{font-size:11px;color:#63738a;margin-top:5px}.paper-option{padding:7px 0;font-size:15px}.paper-option b{display:inline-block;min-width:25px}.practice-entry{font-weight:600}.exercise-workspace{display:grid;grid-template-columns:190px minmax(360px,1fr) 255px;gap:18px;align-items:start}.exercise-board,.exercise-knowledge{padding:18px;position:sticky;top:14px}.exercise-board h2,.exercise-knowledge h3{font-size:15px;margin:0 0 10px}.exercise-board h2 small{font-size:11px;color:#62718a;font-weight:400;margin-left:5px}.board-legend{font-size:10px;color:#52647b;margin-bottom:12px}.question-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;max-height:440px;overflow:auto}.question-grid button{padding:5px 2px;position:relative;min-height:40px;font-size:12px}.question-grid button small{display:block;line-height:10px;min-height:10px;font-size:9px}.question-grid button.current{outline:2px solid #2860a8;outline-offset:-2px}.question-grid button.correct{background:#edf6f2;color:#266445;border-color:#b8d7c8}.question-grid button.wrong{background:#fdf0ed;color:#9b3b29;border-color:#e7c0b7}.progress-text{font-size:12px;margin:15px 0}.exercise-board>button{width:100%;font-size:12px}.exercise-sheet{padding:24px 32px}.exercise-topline{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;color:#58677b;font-size:13px}.exercise-topline button{font-size:12px}.exercise-topline b{font-size:20px;color:#263c5b}.exercise-sheet .question-text{font-size:17px}.exercise-sheet .question-meta{padding-bottom:15px;border-bottom:1px solid var(--line)}.answer-fields{border:0;margin:25px 0 0;padding:0}.answer-fields legend{font-size:13px;color:#566a85;margin-bottom:12px}.answer-option{display:flex;align-items:center;gap:12px;border:1px solid #d7e0ed;margin-bottom:10px;border-radius:5px;padding:12px 15px;cursor:pointer;min-height:50px}.answer-option:has(input:checked){border-color:#467bbd;background:#f0f5ff}.answer-option input{min-height:0;margin:0;accent-color:#285ea8}.answer-option span{min-width:0}.answer-option b{margin-right:12px;font-size:13px}.answer-fields textarea{width:100%;display:block;background:#fcfdff}.answer-actions{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin-top:16px}.answer-actions[hidden]{display:none}#answer-error{color:#a12b20;font-size:13px}.answer-feedback:not(:empty){margin:24px 0;padding:18px;background:#f6f9fc;border:1px solid #d7e2ef;border-radius:6px}.feedback-heading{display:flex;justify-content:space-between;align-items:center;gap:12px}.feedback-heading strong{font-size:14px}.feedback-heading button{font-size:12px}.answer-feedback h3{font-size:13px;margin:18px 0 8px}.self-review{display:flex;gap:8px;margin-top:16px}.exercise-bottom{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:20px;margin-top:28px}.knowledge-link{display:block;text-align:left;width:100%;padding:12px;margin-top:8px;background:#fafcff;line-height:1.5}.knowledge-link span{font-size:13px;display:block}.knowledge-link small{font-size:11px;display:block;color:#536b89;margin-top:5px}.scope-note{font-size:11px;line-height:1.8;color:#7a5a2f;padding:10px;border-left:2px solid #c9a774;background:#fcfaf6}.save-indicator{font-size:12px;color:#577268}.practice-summary{max-width:1000px;margin:12px auto;background:#fff;border:1px solid var(--line);padding:32px;border-radius:7px}.practice-summary h1{font-size:25px;margin:18px 0 6px}.summary-counts{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:6px;margin:25px 0}.summary-counts>div{padding:20px;border-right:1px solid var(--line);font-size:13px;color:#52647b}.summary-counts>div:last-child{border:0}.summary-counts b{display:block;font-size:30px;color:#273d5d}.summary-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}.summary-questions{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:28px}.summary-questions button{font-size:12px}.history-row{display:flex;justify-content:space-between;align-items:center;padding:15px 0;border-bottom:1px solid var(--line);gap:18px}.history-row p{font-size:12px;color:#617188;margin:5px 0}.history-row button{flex-shrink:0}#practice-dialog{width:min(1000px,94vw);max-height:92vh;border:1px solid #c9d4e3;padding:0;border-radius:9px}#practice-dialog::backdrop{background:#15263c66}.practice-dialog-body{padding:24px;overflow:auto;max-height:calc(92vh - 70px)}#practice-dialog .dialogbar{position:sticky;top:0;background:white;z-index:2;padding:14px 24px;border-bottom:1px solid var(--line);gap:12px}#practice-dialog .dialogbar h2{font-size:16px;margin:0}#practice-dialog .dialogbar button{flex-shrink:0}.practice-dialog-body .layout{grid-template-columns:140px minmax(0,1fr);gap:16px}.practice-dialog-body .reading{padding:12px}.practice-dialog-body .sidebar{position:static}.preview-knowledge{border-top:1px solid var(--line);margin-top:24px;padding-top:12px}.preview-knowledge .knowledge-link{display:inline-block;width:auto;margin-right:8px}.print-workspace{display:grid;grid-template-columns:250px minmax(0,1fr);gap:30px;max-width:1200px;margin:auto}.print-controls{display:flex;flex-direction:column;align-items:stretch;gap:18px;background:white;border:1px solid var(--line);border-radius:7px;padding:20px;position:sticky;top:20px;height:fit-content}.print-controls label{display:flex;flex-direction:column;gap:6px;font-size:12px}.print-controls p,.print-controls #print-status{font-size:12px;color:#5c6b80;margin:0}.print-controls .checkbox-label{flex-direction:row;align-items:center}.checkbox-label input{min-height:0}.print-controls input{min-width:0}.print-paper,.print-answer-sheet:not(:empty){background:#fff;padding:45px 50px;border:1px solid #d3dae4;box-shadow:0 5px 20px #2036530b}.paper-heading{border-bottom:2px solid #333;padding-bottom:15px;margin-bottom:24px}.paper-heading h1{font-size:23px;text-align:center;margin:0 0 15px}.paper-heading p{font-size:13px;margin:0}.print-question{padding:8px 0 15px;border-bottom:1px dashed #e1e1e1}.print-q-title{font-size:11px;margin-bottom:8px;color:#556070}.print-q-title b{font-size:17px;color:#182536;margin-right:8px}.print-paper .question-text{font-size:15px}.work-space{height:90px}.print-paper[data-spacing=large] .work-space{height:160px}.print-paper[data-spacing=compact] .work-space{height:24px}.print-answer-sheet:not(:empty){margin-top:25px}.print-answer{padding:14px 0;border-bottom:1px solid #ddd}.print-answer h3{font-size:13px}.print-answer-sheet h1{font-size:23px}.print-question .question-figure img{max-height:260px}
@media(min-width:1600px){.practice-workspace{grid-template-columns:260px minmax(360px,1fr) 290px}.exercise-workspace{grid-template-columns:210px minmax(360px,900px) 290px;justify-content:center}}
@media(max-width:1100px){.practice-workspace{grid-template-columns:195px minmax(0,1fr)}.selection-tray{grid-column:1/-1;position:static}.basket-list{display:flex;gap:16px;flex-wrap:wrap;max-height:150px}.basket-list>div{max-width:240px}.basket-empty{padding:8px}.tray-actions{flex-direction:row}.tray-actions button{flex:1}.exercise-workspace{grid-template-columns:160px minmax(0,1fr)}.exercise-knowledge{grid-column:2;position:static}.exercise-sheet{padding:22px}.summary-questions{grid-template-columns:repeat(4,1fr)}}
@media(max-width:760px){#nav{gap:14px;overflow:auto;white-space:nowrap}#policy{display:none}.practice-heading{align-items:start;gap:10px;flex-wrap:wrap}.practice-heading h1{font-size:21px}.practice-heading p{font-size:12px}.practice-heading-actions{width:100%}.practice-heading-actions button{flex:1}.practice-workspace,.exercise-workspace,.print-workspace{display:flex;flex-direction:column;gap:12px}.practice-workspace>*,.exercise-workspace>*,.print-workspace>*{width:100%}.practice-directory>summary{padding:10px 14px}.practice-results{order:1}.selection-tray{order:2;padding:14px}.basket-list{max-height:120px}.practice-filterbar{padding:12px}.practice-selects{gap:8px}.practice-selects label{min-width:80px}.practice-selects label:nth-child(2){min-width:120px;max-width:100%}.practice-selects select{max-width:100%}.practice-row{padding:16px 12px;gap:8px}.question-row-bottom{align-items:start}.question-meta{font-size:10px;gap:6px}.practice-pagination{padding:12px;flex-wrap:wrap}.exercise-board{position:static;padding:12px}.question-grid{display:flex;max-height:90px;overflow-x:auto;gap:6px;flex-wrap:wrap}.question-grid button{min-width:36px;min-height:40px}.exercise-board h2,.board-legend{display:inline-block;margin-right:8px}.exercise-board .progress-text{display:inline-block;margin:10px 12px 0 0}.exercise-board>button{width:auto;float:right}.exercise-board>p{display:none}.exercise-sheet{padding:20px 16px}.exercise-sheet .question-text{font-size:16px}.exercise-knowledge{position:static;padding:16px}.answer-option{padding:12px}.exercise-bottom button{min-height:42px}.practice-summary{padding:20px 16px;margin:0}.summary-counts>div{padding:12px 8px;font-size:11px}.summary-counts b{font-size:25px}.summary-questions{grid-template-columns:repeat(2,1fr)}.summary-actions button{flex:1 0 45%;font-size:12px}.practice-dialog-body{padding:16px}#practice-dialog .dialogbar{padding:12px 16px}#practice-dialog .dialogbar h2{font-size:14px}.practice-dialog-body .layout{display:block}.practice-dialog-body .sidebar{display:flex;overflow:auto;gap:10px;white-space:nowrap}.practice-dialog-body .sidebar h2{display:none}.practice-dialog-body .reading{padding:14px 0}.print-controls{position:static;gap:12px}.print-paper,.print-answer-sheet:not(:empty){padding:24px 18px}.print-q-title{font-size:10px}.paper-heading p{font-size:11px}.history-row{align-items:start}.history-row button{font-size:12px}}
#practice-search input{min-width:0;flex:1;width:auto}#practice-search button{flex-shrink:0;white-space:nowrap}.math-table-scroll{max-width:100%;overflow-x:auto;margin:12px 0}.math-table{border-collapse:collapse;width:100%;font-size:13px;line-height:1.6}.math-table td,.math-table th{border:1px solid #bdc9d8;padding:7px 9px;text-align:center}.math-table th{background:#f3f6fa;font-weight:500}.question-text.clamped .math-table-scroll{display:none}
@media(max-width:760px){main[data-view=practice]{padding-bottom:94px}.selection-tray .tray-actions{position:fixed;bottom:0;left:0;right:0;margin:0;padding:12px 16px;background:#fff;border-top:1px solid #c8d4e5;z-index:5;box-shadow:0 -3px 14px #25395c0a}.selection-tray .tray-actions button{font-size:12px;min-height:42px}}
.practice-resultbar .result-actions{flex-direction:row;gap:6px;flex-shrink:0}#sequential-practice{color:#235c9f;border-color:#9db7d9;background:#f3f7fd}@media(max-width:760px){.practice-resultbar{flex-wrap:wrap}.practice-resultbar .result-actions{width:100%}.result-actions button{flex:1}}
.practice-policy{display:none;color:#80622c;font-size:11px}@media(max-width:760px){.practice-policy{display:block;margin-top:5px}}
.practice-heading-actions{flex-wrap:wrap;justify-content:flex-end}.knowledge-picker-title{font-weight:600;font-size:12px;margin:14px 0 6px}.knowledge-picker-title span{font-weight:400;color:#68758a;margin-left:8px}.knowledge-picker-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.knowledge-picker-controls label{font-size:11px;color:#58677b;display:flex;flex-direction:column;gap:3px;min-width:0}.knowledge-picker-controls select{width:100%;min-width:0;font-size:12px}.paper-name-label,.random-name{display:flex;flex-direction:column;gap:5px;font-size:12px;color:#4c607a;margin-top:16px}.paper-name-label input,.random-name input{width:100%}.random-builder{max-width:760px;margin:auto}.builder-intro strong{font-size:17px}.builder-intro p{margin:5px 0;color:#5c6b80}.random-builder fieldset{border:1px solid #d8e2ee;border-radius:6px;margin:20px 0;padding:14px 16px}.random-builder legend{padding:0 7px;font-weight:600}.random-builder fieldset>p{margin:3px 0 12px}.random-scope{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.scope-group{border:1px solid var(--line);padding:10px;border-radius:5px}.scope-group label{display:flex;align-items:flex-start;gap:5px;font-size:13px}.scope-group input{min-height:0;margin:4px 0}.scope-children{display:flex;flex-direction:column;gap:7px;margin:10px 0 0 18px}.random-quantities,.random-ratios{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.random-ratios{grid-template-columns:repeat(3,minmax(0,1fr))}.random-quantities label,.random-ratios label{font-size:12px;display:flex;flex-direction:column;gap:5px}.random-quantities input,.random-ratios input{width:65px}.builder-action{display:flex;gap:12px;align-items:center}.builder-action span{color:#a22f22;font-size:12px}.random-shortage,.generated-paper{background:#f8fafd;border:1px solid #d7e2ef;border-radius:6px;margin-top:20px;padding:16px}.random-shortage{background:#fff8f4;border-color:#eed2c5;color:#864c32}.random-shortage ul{padding-left:20px}.generated-paper h3{margin:0}.generated-paper p{color:#58677b;font-size:12px}.generated-section{display:flex;justify-content:space-between;gap:8px;border-bottom:1px solid var(--line);padding:8px 0;font-size:12px}.generated-section span{color:#5a6a80}.generated-paper details{margin:12px 0;font-size:12px}.generated-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.saved-paper{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:15px 0;border-bottom:1px solid var(--line)}.saved-paper p{font-size:12px;color:#607088;margin:4px 0}.saved-paper>div:last-child{display:flex;gap:6px;flex-wrap:wrap}.saved-paper button{font-size:12px}.random-builder input:disabled{opacity:.4}@media(max-width:760px){.practice-heading-actions{justify-content:start}.practice-heading-actions button{flex:1 1 40%}.knowledge-picker-controls,.random-scope{grid-template-columns:repeat(2,minmax(0,1fr))}.random-quantities{grid-template-columns:repeat(2,minmax(0,1fr))}.saved-paper{align-items:start;flex-direction:column}.generated-section{flex-direction:column}.selection-tray .paper-name-label{margin-bottom:8px}}
@media(max-width:520px){.random-scope{grid-template-columns:1fr}.scope-children{display:flex;flex-direction:column}.practice-heading-actions button{min-width:0}}
#status button{color:#202b3c;background:#fff;border-color:#cfd7e2}#status button:hover{color:#202b3c;background:#edf3fc;border-color:#8aa9d2}
.preview-answer{margin-top:24px;padding:16px;border:1px solid #d7e2ef;border-radius:6px;background:#f8fafd}.preview-answer h3{font-size:14px;margin:16px 0 8px}.preview-answer p{margin:8px 0}.preview-answer details{margin-top:8px}.preview-answer #preview-answer-content:empty{display:none}
@page{size:A4;margin:16mm 17mm}
@media print{body{background:white;font:11pt/1.6 'Microsoft YaHei',sans-serif;color:#000}body>header,.navline,#status,footer,.skip,dialog,.print-controls{display:none!important}main{padding:0!important;margin:0!important;max-width:none!important}.print-workspace,.print-preview{display:block;max-width:none;margin:0}.print-paper,.print-answer-sheet:not(:empty){padding:0;border:0;box-shadow:none;margin:0}.print-question{break-inside:avoid;border:0;padding:4mm 0}.question-figure{break-inside:avoid;margin:3mm 0}.print-question img{max-width:100%;max-height:65mm}.print-q-title{color:#333;font-size:9pt}.print-paper .question-text,.paper-option{font-size:11pt}.paper-heading{break-after:avoid}.print-answer-sheet:not(:empty){break-before:page}.print-answer{break-inside:avoid}.work-space{height:22mm}.print-paper[data-spacing=large] .work-space{height:40mm}.print-paper[data-spacing=compact] .work-space{height:6mm}a{color:inherit}*{scrollbar-width:none}}