:root{--ink:#19345b;--text:#293b52;--muted:#69788b;--blue:#315fd5;--blue-soft:#edf2ff;--line:#dce3ed;--page:#f2f5f9;--green:#21745d;--red:#b74444;--radius:14px;--body:"PingFang TC","Microsoft JhengHei",system-ui,sans-serif;--display:"Avenir Next","PingFang TC","Microsoft JhengHei",sans-serif}
*{box-sizing:border-box}
body{margin:0;background:var(--page);color:var(--text);font-family:var(--body);font-size:15px;line-height:1.65;-webkit-tap-highlight-color:transparent}
button,input,select{font:inherit}
button,a,input,select,summary{touch-action:manipulation}
button{cursor:pointer}
button:disabled{cursor:default;opacity:.4}
button,a,summary,input,select{-webkit-tap-highlight-color:transparent}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #7196ff;outline-offset:4px}
button{color:inherit}
a{color:inherit}
[hidden]{display:none!important}
.icon-library{width:0;height:0;position:absolute;overflow:hidden}
.icon{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:fixed;top:-100px;left:16px;padding:12px;background:#fff;z-index:30}
.skip-link:focus{top:10px}
.topbar{height:78px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 36px;gap:20px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:18px;letter-spacing:.04em;font-weight:700;color:var(--ink);line-height:1.3}
.brand-mark{display:grid;place-items:center;width:42px;height:45px;border-radius:12px;background:var(--ink);color:#fff;font-family:Georgia,serif;font-weight:400;font-size:33px;line-height:1;padding-bottom:4px}
.brand small{display:block;color:var(--muted);font-size:10px;font-weight:400;letter-spacing:.13em;margin-top:5px}
.topbar-right{display:flex;align-items:center;gap:18px;font-size:12px;color:var(--muted)}
.trial-badge{border:1px solid var(--line);padding:3px 10px;border-radius:5px;font-size:11px}
.save-indicator{display:flex;align-items:center;gap:7px}
.save-indicator:before{content:"";width:6px;height:6px;background:var(--green);border-radius:50%;flex-shrink:0}
.save-indicator.error{color:var(--red);max-width:300px}
.save-indicator.error:before{background:var(--red)}
.page-shell{max-width:1580px;margin:0 auto;display:grid;grid-template-columns:176px minmax(0,1fr);gap:32px;padding:34px 36px 20px}
.sidebar{padding-top:5px;align-self:start;position:sticky;top:24px}
.eyebrow{margin:0 0 7px;font-size:11px;font-weight:600;letter-spacing:.1em;color:var(--muted)}
.sidebar>h2{font-size:21px;color:var(--ink);margin:0 0 27px;font-weight:700;letter-spacing:.04em}
.progress-caption{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:12px}
.progress-caption strong{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px;font-weight:500;color:var(--ink)}
progress{display:block;width:100%;height:4px;appearance:none;border:0;border-radius:8px;overflow:hidden;margin:9px 0 30px;background:#dfe5ef}
progress::-webkit-progress-bar{background:#dfe5ef}
progress::-webkit-progress-value{background:var(--blue);border-radius:8px}
progress::-moz-progress-bar{background:var(--blue);border-radius:8px}
.nav-group{margin-bottom:25px}
.nav-group h3{font-size:12px;font-weight:500;color:var(--muted);margin:0 0 10px}
.question-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px}
.question-link{position:relative;min-width:0;height:37px;border:1px solid #d7dfeb;border-radius:7px;background:#fff;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px;transition:background .15s,color .15s}
.question-link.answered{background:#e6edfc;border-color:#e6edfc;color:#294f9c}
.question-link.current{background:var(--ink);border-color:var(--ink);color:#fff;font-weight:700;box-shadow:0 3px 6px #19345b18}
.question-link.flagged:after{content:"";position:absolute;right:-2px;top:-3px;background:#cf9134;width:7px;height:7px;border:2px solid var(--page);border-radius:50%;box-sizing:content-box}
.question-link.correct{background:#e7f3ed;color:var(--green);border-color:#cce5d8}
.question-link.incorrect{background:#fbeeed;color:var(--red);border-color:#efd2d0}
.question-link.current.correct,.question-link.current.incorrect{box-shadow:0 0 0 2px var(--ink);border-color:#fff}
.nav-legend{display:flex;gap:13px;font-size:10px;color:var(--muted);margin-top:6px}
.nav-legend>span{display:flex;gap:5px;align-items:center}
.legend-dot{width:6px;height:6px;border-radius:50%;display:inline-block}
.answered-dot{background:#8ba4dc}.flagged-dot{background:#cf9134}
.sidebar-note{display:flex;align-items:flex-start;gap:9px;border-top:1px solid var(--line);margin-top:31px;padding-top:20px;color:var(--muted)}
.sidebar-note .icon{width:15px;height:15px;margin-top:3px}
.sidebar-note p{margin:0;font-size:11px;line-height:1.9}.sidebar-note span{font-size:10px}
.filter-button{margin-top:15px;padding:8px;font-size:11px;background:#fff;border:1px solid var(--line);border-radius:6px;width:100%}
.filter-button.active{background:var(--blue-soft);border-color:var(--blue);color:var(--blue)}
main{min-width:0}
.exercise-header{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:92px;margin-bottom:23px}
h1{font-family:var(--display);font-size:29px;line-height:1.25;letter-spacing:.02em;color:var(--ink);margin:0 0 10px}
.exercise-description{margin:0;font-size:12px;color:var(--muted)}
.exercise-description>span{margin:0 7px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:11px 18px;min-height:46px;border-radius:8px;font-size:13px;font-weight:600;border:1px solid transparent;white-space:nowrap;text-decoration:none}
.primary{background:var(--blue);color:#fff;box-shadow:0 3px 7px #315fd514}
.primary:hover{background:#244db8}
.secondary{background:#fff;border-color:var(--line);color:var(--text)}
.secondary:hover{background:#f3f6fb}
.submit-button{align-self:center}
.submit-button .icon{width:17px;height:17px}
.workspace{display:grid;grid-template-columns:minmax(0,.96fr) minmax(0,1.04fr);gap:20px;align-items:start}
.panel{border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:0 3px 8px #19345b03;overflow:hidden;min-width:0}
.question-pane{padding:24px 25px 0}
.question-topline{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:27px}
.question-actions{display:flex;align-items:center;gap:11px}
.writing-jump,.back-question{display:none;align-items:center;gap:5px;font-size:11px;color:var(--blue);text-decoration:none;padding:9px 0;min-height:38px}
.writing-jump .icon{width:15px;height:15px}
.topic-tag{font-size:11px;color:#385d9c;background:#edf2fa;padding:4px 10px;border-radius:5px;font-weight:500}
.bookmark-button{display:flex;align-items:center;gap:5px;border:0;background:none;padding:6px 0 6px 8px;color:var(--muted);font-size:11px;min-height:36px}
.bookmark-button .icon{width:15px;height:15px}
.bookmark-button[aria-pressed=true]{color:#996619}
.bookmark-button[aria-pressed=true] .icon{fill:#fff2d4}
.question-number{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:11px;letter-spacing:.09em;color:#76869a;margin-bottom:12px}
#question-heading{font-size:18px;font-weight:600;line-height:1.85;color:var(--ink);margin:0 0 17px;outline:none;overflow-wrap:normal}
.quantity{display:inline-block;white-space:nowrap}
.statements{font-size:14px;line-height:1.95;margin:0 0 24px}
.statement{margin:0 0 10px;display:flex;gap:11px}
.statement-number{color:#748397;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px;flex-shrink:0;padding-top:2px}
.options{padding:0;margin:0;border:0;display:grid;gap:10px;min-width:0}
.option{display:flex;align-items:center;gap:13px;min-height:57px;border:1px solid var(--line);border-radius:9px;padding:11px 14px;cursor:pointer;font-size:14px;position:relative;line-height:1.55}
.option:not(:has(input:disabled)):hover{border-color:#93aae1;background:#f8faff}
.option:has(input:checked){background:var(--blue-soft);border-color:var(--blue);color:#254dba;box-shadow:inset 0 0 0 .5px var(--blue)}
.option input{position:absolute;opacity:0;width:1px;height:1px}
.option:has(input:focus-visible){outline:3px solid #7196ff;outline-offset:3px}
.option-letter{width:29px;height:29px;display:grid;place-items:center;flex-shrink:0;border:1px solid #d8e0ec;background:#f7f9fc;border-radius:7px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px;font-weight:600}
.option:has(input:checked) .option-letter{color:#fff;background:var(--blue);border-color:var(--blue)}
.option .option-result{margin-left:auto;font-size:11px;white-space:nowrap}
.option.answer-correct{border-color:#6fa98d;background:#eef7f2;color:var(--green);box-shadow:none}
.option.answer-correct .option-letter{color:#fff;background:var(--green);border-color:var(--green)}
.option.answer-wrong{border-color:#d7a4a4;background:#fdf2f1;color:var(--red);box-shadow:none}
.option.answer-wrong .option-letter{color:#fff;background:var(--red);border-color:var(--red)}
.option:has(input:disabled){cursor:default}
.answer-note{font-size:10px;color:var(--muted);margin:14px 0 22px;min-height:17px}
.apparatus{margin:0 0 20px;padding:12px 0 16px;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}
.apparatus img{width:100%;height:auto;display:block;margin:6px auto;max-width:480px}
.apparatus figcaption{text-align:center;font-size:10px;margin:8px 0 0}
.question-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;border-top:1px solid var(--line);margin-top:4px;padding:19px 0}
.question-footer .button{min-height:41px;padding:8px 13px;font-size:12px}
#position-label{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:10px;color:var(--muted)}
.next-button{background:var(--ink);color:#fff}
.next-button .icon{width:15px;height:15px}
.notes-header{padding:19px 21px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.notes-header .eyebrow{font-size:9px;letter-spacing:.12em;display:block;margin-bottom:4px}
.notes-header h2{font-size:16px;color:var(--ink);margin:0;font-weight:600;letter-spacing:.02em}
.icon-button{display:grid;place-items:center;background:none;border:1px solid var(--line);border-radius:7px;width:37px;height:37px;color:var(--muted)}
.icon-button .icon{width:17px;height:17px}
.writing-toolbar{display:flex;align-items:center;gap:8px;padding:10px 14px;border-block:1px solid var(--line);background:#fbfcfe;flex-wrap:wrap}
.tool-group{display:flex;gap:2px;padding-right:8px;border-right:1px solid var(--line);align-items:center}
.tool-button{display:grid;place-items:center;flex-shrink:0;width:35px;height:36px;border:1px solid transparent;border-radius:6px;background:transparent;color:#6c7c91}
.tool-button .icon{width:18px;height:18px}
.tool-button.active{color:var(--blue);background:#e7edfb;border-color:#d8e2fa}
.tool-button:hover:not(:disabled){background:#edf2fa}
.color-group{gap:6px;padding-inline:2px 10px}
.color-button{position:relative;width:24px;height:35px;background:transparent;border:0;border-radius:5px;flex-shrink:0}
.color-button:before{content:"";position:absolute;width:15px;height:15px;background:var(--swatch);border-radius:50%;top:10px;left:4px}
.color-button.selected:after{content:"";position:absolute;inset:6px 0;border:1px solid var(--swatch);border-radius:50%}
.width-control select{width:40px;height:35px;background:#fff;border:1px solid var(--line);border-radius:5px;color:var(--muted);font-size:11px;padding-left:5px}
.grid-button{margin-left:auto}
.clear-button{width:31px}
.input-options{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 20px;font-size:10px;color:var(--muted);border-bottom:1px solid #edf0f5}
.input-options label{display:flex;gap:6px;align-items:center;cursor:pointer;min-height:24px}
.input-options input{accent-color:var(--blue);margin:0;width:13px;height:13px}
.paper{position:relative;background-color:#fff;background-image:linear-gradient(#dbe4f080 1px,transparent 1px),linear-gradient(90deg,#dbe4f080 1px,transparent 1px);background-size:24px 24px;aspect-ratio:4/5;width:100%;isolation:isolate}
.paper.no-grid{background-image:none}
canvas{display:block;width:100%;height:100%;touch-action:none;position:absolute;inset:0;cursor:crosshair;z-index:1}
.paper-placeholder{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;pointer-events:none;padding-bottom:30px;color:#91a0b6;user-select:none}
.paper-placeholder .icon{width:29px;height:29px;stroke-width:1.3;margin-bottom:12px;color:#9dacc3}
.paper-placeholder p{font-size:13px;margin:0 0 5px;letter-spacing:.04em}
.paper-placeholder span{font-size:10px;color:#9ba9bc}
.paper-label{position:absolute;right:16px;bottom:14px;font-size:9px;letter-spacing:.1em;color:#9aa9bf;pointer-events:none}
.writing-help{font-size:10px;color:var(--muted);line-height:1.8;margin:0;padding:12px 18px;border-top:1px solid var(--line);background:#fbfcfe}
.page-footer{display:flex;gap:16px;justify-content:space-between;margin:20px 1px 8px;color:#78869a;font-size:10px}
.explanation{border-radius:9px;border:1px solid #d7e5df;background:#f6faf8;padding:18px;margin-bottom:24px;font-size:13px;line-height:1.95}
.explanation h3{color:var(--green);font-size:14px;margin:0 0 12px}
.explanation p{margin:10px 0 0}
.result-strip{background:var(--ink);color:#fff;border-radius:11px;padding:15px 20px;display:flex;align-items:center;gap:20px;margin-bottom:20px}
.result-strip strong{font-size:22px;font-family:var(--display);letter-spacing:.03em}
.result-strip p{margin:0;font-size:11px;color:#c7d3e5}
.result-strip button{margin-left:auto;background:#fff1;border:1px solid #ffffff35;color:#fff;border-radius:6px;padding:8px 13px;font-size:12px;min-height:40px}
.focus-writing .workspace{grid-template-columns:1fr;max-width:850px;margin:0 auto}
.focus-writing .question-pane,.focus-writing .sidebar{display:none}
.focus-writing .page-shell{grid-template-columns:1fr}
.focus-writing .notes-pane{width:100%}
dialog{border:1px solid var(--line);border-radius:18px;padding:0;max-width:530px;width:calc(100% - 40px);max-height:calc(100dvh - 48px);color:var(--text);box-shadow:0 24px 80px #19345b35}
dialog::backdrop{background:#132c4e77;backdrop-filter:blur(3px)}
.dialog-content{padding:32px}
.dialog-content h2{font-family:var(--display);font-size:23px;line-height:1.5;color:var(--ink);margin:0 0 14px}
.dialog-content p{font-size:14px;line-height:1.9}
.dialog-icon{display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);width:45px;height:45px;border-radius:12px;margin-bottom:20px}
.dialog-note{color:var(--muted);font-size:12px!important;background:#f3f6fa;border-radius:8px;padding:12px 14px}
.dialog-actions{display:flex;gap:12px;justify-content:flex-end;margin-top:26px;flex-wrap:wrap}
.danger{background:var(--red);color:#fff}
.unanswered-list{display:flex;gap:6px;flex-wrap:wrap}
.unanswered-list span{font-size:11px;background:#f3f5f9;border:1px solid var(--line);padding:3px 9px;border-radius:5px}
.score-block{display:flex;align-items:center;gap:21px;border-bottom:1px solid var(--line);padding:7px 0 20px;margin-bottom:20px}
.score-number{font-size:65px;color:var(--blue);font-family:var(--display);font-weight:600;line-height:1.15;letter-spacing:-.04em}
.score-number small{font-size:21px;color:#8c9bb0;font-weight:400;letter-spacing:0}
.score-block p{margin:0;font-size:12px}.score-block strong{display:block;font-size:15px;color:var(--ink);margin-bottom:2px}
.topic-result{margin-bottom:15px}
.topic-result>div{display:flex;justify-content:space-between;font-size:12px}
.topic-result progress{margin:8px 0 0;height:5px}
.download-button{display:block;margin:20px auto 0;border:0;background:none;color:var(--muted);font-size:11px;text-decoration:underline;text-underline-offset:4px;padding:6px}
@media(hover:hover){.question-link:hover{border-color:#809ccf}.bookmark-button:hover{color:var(--blue)}}
@media(min-width:1400px){.workspace{gap:25px}.question-pane{padding-inline:32px}.question-topline{margin-bottom:33px}#question-heading{font-size:20px}.statements{font-size:15px}.writing-toolbar{gap:11px;padding-inline:20px}.tool-button{width:38px}.color-button{width:27px}.color-button:before{left:6px}.color-button.selected:after{inset:6px 2px}}
@media(max-width:1150px){.page-shell{gap:23px;grid-template-columns:154px minmax(0,1fr);padding-inline:24px}.topbar{padding-inline:24px}.question-pane{padding-inline:20px}.workspace{gap:15px}.writing-toolbar{gap:5px;padding-inline:9px}.tool-group{padding-right:5px}.tool-button{width:31px}.color-group{gap:1px;padding-right:5px}.color-button{width:23px}.grid-button{margin-left:0}.clear-button{margin-left:auto}.button{padding-inline:14px}.exercise-header{gap:12px}h1{font-size:26px}}
@media(max-width:1280px){.page-shell{display:flex;flex-direction:column;gap:17px;padding:20px}.sidebar{position:static;order:1;padding:0;align-self:stretch}.sidebar>.eyebrow,.sidebar>h2,.sidebar-note,.nav-legend{display:none}.progress-caption{font-size:11px;max-width:none}.sidebar>progress{margin:7px 0 14px;height:3px}.navigation-groups{display:flex;gap:20px}.nav-group{margin:0;flex:1}.nav-group h3{font-size:10px;margin-bottom:8px}.question-link{height:37px;font-size:12px}.question-grid{gap:5px}main{order:2}.exercise-header{min-height:90px;margin-bottom:20px}.workspace{grid-template-columns:1fr 1fr}.writing-toolbar{padding:9px;gap:5px}.color-group{border-right:0;padding-right:0}.width-control{display:none}.tool-button{width:31px}.input-options{padding-inline:13px}.topbar{height:70px}.brand{font-size:16px}.brand-mark{width:36px;height:39px;font-size:28px}.save-indicator{font-size:10px}.focus-writing .page-shell{display:block}.focus-writing .exercise-header{margin-top:16px}}
@media(max-width:760px){.workspace{grid-template-columns:1fr}.exercise-header{align-items:flex-start;margin-bottom:18px}.exercise-header .eyebrow{font-size:9px}h1{font-size:24px;margin-bottom:8px}.exercise-description{font-size:10px}.submit-button{padding:10px 12px;font-size:11px;min-height:43px}.submit-button .icon{display:none}.question-pane{padding:22px 23px 0}.question-topline{margin-bottom:21px}#question-heading{font-size:18px}.statements{font-size:14px}.notes-header{padding:16px 20px}.writing-toolbar{gap:9px;padding-inline:16px}.tool-button{width:36px;height:39px}.color-group{border-right:1px solid var(--line);padding-right:9px;gap:6px}.width-control{display:block}.grid-button{margin-left:auto}.clear-button{margin-left:0}.paper{aspect-ratio:4/4.2}.page-footer{flex-direction:column;gap:4px;margin-top:15px}.topbar{padding-inline:20px}.topbar-right{gap:9px}.trial-badge{display:none}.save-indicator{max-width:165px;font-size:9px}.option{min-height:58px}.notes-pane{scroll-margin-top:15px}.focus-writing .exercise-header{margin-top:0}.navigation-groups{gap:12px}.nav-group h3{font-size:9px}.question-link{height:35px;font-size:11px}.question-grid{gap:4px}}
@media(max-width:420px){.page-shell{padding:15px 13px;gap:16px}.topbar{padding-inline:14px}.brand{font-size:15px;gap:8px}.brand small{font-size:9px}.save-indicator{max-width:132px;font-size:9px;line-height:1.5}.exercise-header{gap:8px;align-items:center}h1{font-size:22px}.exercise-description{max-width:190px;line-height:1.7}.exercise-header .eyebrow{font-size:9px}.submit-button{max-width:110px;white-space:normal;line-height:1.6;padding:9px 12px}.question-pane{padding-inline:19px}.question-grid{gap:3px}.question-link{font-size:10px;border-radius:5px}.nav-group h3{font-size:9px;letter-spacing:-.05em}.writing-toolbar{gap:5px;padding-inline:10px}.tool-button{width:32px}.tool-group{padding-right:5px}.color-group{gap:2px;padding-right:5px}.color-button{width:22px}.width-control select{width:37px}.grid-button{margin-left:auto}.clear-button{width:28px}.question-footer .button{padding-inline:11px}#position-label{font-size:9px}.dialog-content{padding:25px}.dialog-content h2{font-size:21px}.dialog-actions{gap:8px}.dialog-actions .button{font-size:12px;padding-inline:12px}.result-strip{padding:13px 15px;gap:12px}.result-strip strong{font-size:19px}.result-strip button{font-size:11px;padding-inline:10px}}
@media(max-width:900px){.workspace{grid-template-columns:1fr}.paper{aspect-ratio:4/5}.notes-pane .writing-toolbar{gap:9px;padding-inline:16px}.notes-pane .width-control{display:block}.notes-pane .grid-button{margin-left:auto}.writing-jump,.back-question{display:flex}.sidebar{align-self:stretch}.question-actions{gap:13px}}
@media(max-width:420px){.notes-pane .writing-toolbar{gap:5px;padding-inline:10px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

.question-annotation-toolbar{position:sticky;top:8px;z-index:5;background:#fff;display:flex;flex-wrap:wrap;align-items:center;gap:5px;padding:10px 0;border-block:1px solid var(--line);margin-bottom:10px}
.question-annotation-toolbar .tool-button{width:39px;height:40px}
.annotation-mode,.annotation-color{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-height:40px;padding:7px 10px;border:1px solid var(--line);border-radius:6px;background:#fff;font-size:11px}
.annotation-mode .icon,.annotation-color .icon{width:16px;height:16px}
.annotation-mode.active{background:var(--ink);border-color:var(--ink);color:#fff}
.annotation-color{padding-inline:8px}
.yellow-marker{background:#fff7ce;color:#79600e;border-color:#edd986}
.blue-marker{background:#e2f4fc;color:#246581;border-color:#aed9eb}
.annotation-color.active{outline:2px solid currentColor;outline-offset:1px}
.question-annotation-caption{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:9px;color:var(--muted)}
.question-annotation-caption label{display:flex;align-items:center;gap:5px;min-height:28px;white-space:nowrap;cursor:pointer}
.question-annotation-caption input{accent-color:var(--blue);margin:0;width:13px;height:13px}
.question-annotation-help{font-size:10px;line-height:1.8;color:var(--muted);margin:5px 0 13px;min-height:18px}
.question-pane{overflow:visible}
.question-pane .question-topline{margin-bottom:15px}
.question-sheet{position:relative;width:100%;max-width:520px;margin:0 auto 12px;overflow:hidden;isolation:isolate}
.question-paper{position:relative;width:520px;padding:20px 30px 70px;transform-origin:top left;-webkit-text-size-adjust:100%;text-size-adjust:100%}
.question-paper .legacy-question-heading{font-size:26px;line-height:1.85;margin:0 0 25px}
.question-paper .question-number{font-size:15px;margin-bottom:18px}
.question-paper .statements{font-size:21px;line-height:1.95;margin-bottom:28px}
.question-paper .statement{gap:15px;margin-bottom:20px}
.question-paper .statement-number{font-size:18px;padding-top:2px}
.question-paper .options{gap:14px}
.question-paper .option{min-height:72px;font-size:21px;gap:18px;padding:14px 16px;border-radius:12px}
.question-paper .option-letter{width:40px;height:40px;font-size:18px;border-radius:10px}
.question-paper .option-text{min-width:0}
.question-paper .option .option-result{position:absolute;right:10px;top:-10px;margin:0;background:#fff;padding:0 6px;font-size:14px}
.question-paper .answer-note{font-size:14px;line-height:1.65;min-height:24px;margin:18px 0 0}
#question-canvas{z-index:2;pointer-events:none;touch-action:auto}
@media(max-width:420px){.question-annotation-toolbar{gap:4px}.annotation-mode,.annotation-color{padding-inline:7px}.question-annotation-toolbar .tool-button{width:36px}.question-annotation-caption{flex-wrap:wrap;gap:0}}

.workspace.integrated-workspace{grid-template-columns:minmax(0,1fr);max-width:1120px;margin-inline:auto}
.option-description{cursor:default}
.option-description.is-selected{border-color:#9cb5e6;background:#f3f6fd}
.option-description.is-selected .option-letter{background:var(--blue);border-color:var(--blue);color:#fff}
.integrated-working{margin-top:30px;border-top:1px solid var(--line);padding-top:22px}
.integrated-working h3{font-size:16px;font-weight:500;letter-spacing:.06em;color:var(--muted);margin:0 0 16px;scroll-margin-top:90px}
.working-grid{height:420px;background-image:linear-gradient(#dbe4f066 1px,transparent 1px),linear-gradient(90deg,#dbe4f066 1px,transparent 1px);background-size:26px 26px}
.answer-selection{border:0;border-top:1px solid var(--line);padding:18px 0 0;margin:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;min-width:0}
.answer-selection legend{font-size:13px;color:var(--ink);font-weight:600;padding:0 10px 0 0}
.answer-choice{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;min-height:72px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;color:var(--ink)}
.answer-choice input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer}
.choice-letter{font-size:22px;font-weight:600;line-height:1.4}
.choice-result{font-size:10px;line-height:1.5}
.answer-choice:has(input:checked){border-color:var(--blue);background:var(--blue-soft);box-shadow:inset 0 0 0 1px var(--blue);color:var(--blue)}
.answer-choice:has(input:focus-visible){outline:3px solid #779be8;outline-offset:3px}
.answer-choice:has(input:disabled){cursor:default}
.answer-choice input:disabled{cursor:default}
.answer-choice.answer-correct{border-color:var(--green);background:#f0f8f4;color:var(--green);box-shadow:inset 0 0 0 1px var(--green)}
.answer-choice.answer-wrong{border-color:var(--red);background:#fff4f2;color:var(--red);box-shadow:inset 0 0 0 1px var(--red)}
.answer-selection-help{font-size:11px;color:var(--muted);margin:12px 0 24px;line-height:1.8}
.previous-notes{min-width:0;width:100%;max-width:740px;margin-inline:auto}
.previous-notes>summary{cursor:pointer;padding:15px 3px;color:var(--muted);font-size:12px;min-height:48px}
.focus-writing .workspace.integrated-workspace{max-width:850px}
.focus-writing .previous-notes>summary{display:none}
.integrated-workspace .writing-jump{display:flex}
@media(max-width:420px){.answer-selection{gap:8px}.answer-choice{min-height:64px}.choice-letter{font-size:20px}}

/* 先保留可讀圖幅與原有題紙寬度，空間足夠才並排。 */
.question-pane{container-name:exercise;container-type:inline-size}
.question-layout{display:grid;grid-template-columns:minmax(0,1fr);align-items:start}
.question-body{min-width:0}
@container exercise (min-width:944px){
  .question-layout{grid-template-columns:minmax(400px,1fr) minmax(520px,560px);gap:24px}
  .question-layout .apparatus{position:sticky;top:88px;margin:0;padding:0;border-bottom:0}
  .question-layout .apparatus img{margin:20px auto 0}
}
@media(min-width:768px) and (max-width:1280px){
  .question-link{height:44px}
  .nav-group h3{font-size:11px}
  .question-annotation-caption,.question-annotation-help,.answer-selection-help,.apparatus figcaption,#position-label{font-size:12px}
  .annotation-mode,.annotation-color{font-size:12px}
}
@media(pointer:coarse){
  .question-annotation-toolbar .tool-button{width:44px;height:44px}
  .annotation-mode,.annotation-color{min-height:44px;padding-inline:12px}
  .question-annotation-caption label,.writing-jump,.bookmark-button{min-height:44px}
  .question-footer .button{min-height:44px}
}
.focus-writing .previous-notes{max-width:none}