/* Reading surfaces are neutral; only the outer background inherits the home theme. */
.exam-shell{--reading-paper:#fff;--reading-text:#30363d;--reading-line:#e1e5eb;--reading-muted:#87919d;--reading-selected:#f0f6fd;--reading-selected-line:#d5e3f3;--reading-letter:#e1edfb;--reading-letter-text:#6483a6;--reading-font:18px;background:var(--bg)}
.exam-shell[data-reading=night]{--reading-paper:#282f39;--reading-text:#d8dee7;--reading-line:#414b59;--reading-muted:#9eabbc;--reading-selected:#2c3c50;--reading-selected-line:#425a77;--reading-letter:#354c68;--reading-letter-text:#b8cee8;background:#181d25}
.exam-shell .exam-head{height:70px;min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:0 24px;background:var(--reading-paper);border-color:var(--reading-line);color:var(--reading-text);z-index:12}.exam-shell .exam-head-left,.exam-shell .exam-head-right{display:flex;align-items:center;gap:8px;flex-shrink:0}.exam-shell .exam-heading{min-width:0;overflow:hidden}.exam-shell .exam-heading strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px;color:var(--reading-muted)}.exam-shell .icon-button{width:44px;height:44px;min-width:44px;min-height:44px;padding:11px;background:transparent;color:var(--reading-muted);border:0}.exam-shell .icon-button svg{width:19px;height:19px;stroke-width:1.5}.exam-shell .exam-clock{font-size:19px;color:var(--reading-text);font-variant-numeric:tabular-nums}.exam-shell #reading-exit-label{font-size:12px}.exam-shell #exam-progress{font-size:12px;color:var(--reading-muted)}
.exam-shell .exam-scroll{padding:22px 18px 85px;min-height:0}.exam-shell .question-stack{max-width:860px}.exam-shell .qpaper{background:var(--reading-paper);border:1px solid var(--reading-line);border-radius:14px;color:var(--reading-text);overflow:hidden;margin-bottom:16px}.exam-shell .qhead{display:flex;flex-wrap:nowrap;justify-content:space-between;align-items:center;gap:10px;padding:15px 22px 6px;background:var(--reading-paper);color:var(--reading-text);border:0}.exam-shell .qhead-left{min-width:0;display:flex;align-items:center;gap:10px}.exam-shell .qkind{font-size:11px;color:var(--reading-muted)}.exam-shell .qnum{font-size:18px;color:var(--reading-text)}.exam-shell .q-origin-v29{display:none}.exam-shell .qactions{margin-left:auto;display:flex;flex-wrap:nowrap;gap:2px}.exam-shell .qactions .icon-button{width:44px;height:44px}.exam-shell .qactions [data-exam=mark].marked{color:#ad9562}.exam-shell .qactions [data-exam=mark].marked svg{fill:#e9dfc5}.exam-shell .qmain{padding:12px 24px 23px;color:var(--reading-text)}.exam-shell .qstem{font-size:var(--reading-font);line-height:1.95;color:var(--reading-text)}.exam-shell .option-button{font-size:calc(var(--reading-font) - 2px);line-height:1.8;background:transparent;color:var(--reading-text);border:1px solid transparent;border-radius:11px;padding:12px 38px 12px 14px}.exam-shell .option-letter{font-weight:400;background:transparent;color:var(--reading-muted);border:1px solid var(--reading-line)}.exam-shell .option-row.selected .option-button{background:var(--reading-selected);border-color:var(--reading-selected-line);color:var(--reading-text)}.exam-shell .option-row.selected .option-letter{background:var(--reading-letter);border-color:var(--reading-selected-line);color:var(--reading-letter-text)}.exam-shell .qfoot{display:none}
.exam-shell .material-preview{max-width:860px;margin:15px auto 18px;border:1px solid var(--reading-line);border-radius:14px;background:var(--reading-paper);color:var(--reading-text)}.exam-shell .material-head{background:var(--reading-paper);padding:13px 21px;border-color:var(--reading-line)}.exam-shell .material-head strong{font-size:12px;color:var(--reading-muted)}.exam-shell .material-head .button{background:transparent;color:var(--reading-text);border:1px solid var(--reading-line);min-height:44px}.exam-shell .material-content{padding:20px 24px;font-size:calc(var(--reading-font) - 2px);line-height:2;color:var(--reading-text)}
.exam-shell .split-shell{inset:70px 0 58px;z-index:5;background:transparent;padding:18px}.exam-shell .split-viewport{max-width:1250px;height:100%;margin:0 auto;position:relative;overflow:hidden;border:1px solid var(--reading-line);border-radius:15px;background:var(--reading-paper)}.exam-shell .split-main{height:100%;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);min-height:0;background:var(--reading-paper)}.exam-shell .split-pane{min-width:0;min-height:0;display:flex;flex-direction:column;border:0;background:var(--reading-paper)}.exam-shell .split-pane:first-child{border-right:1px solid var(--reading-line)}.exam-shell .split-scroll{flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;touch-action:pan-y;scrollbar-width:thin}.exam-shell .split-material-content{position:relative;min-height:100%;padding:25px 30px;font-size:calc(var(--reading-font) - 2px);line-height:2;color:var(--reading-text)}.exam-shell .split-questions{padding:8px 12px 20px}.exam-shell .split-questions .qpaper{border:0;border-bottom:1px solid var(--reading-line);border-radius:0;margin-bottom:10px}.exam-shell .material-peek{position:absolute;inset:0;pointer-events:none;will-change:transform}.exam-shell .peek-body{padding:25px 30px;overflow:hidden;font-size:calc(var(--reading-font) - 2px);line-height:2;color:var(--reading-text)}
.reading-answer-dock{position:absolute;left:0;right:0;bottom:0;height:58px;z-index:15;display:flex;justify-content:center;background:var(--reading-paper);border-top:1px solid var(--reading-line)}.reading-answer-dock button{width:100%;max-width:860px;min-height:58px;display:flex;justify-content:center;align-items:center;gap:11px;background:transparent;border:0;color:var(--reading-text);font-size:13px}.reading-answer-dock svg{width:18px;height:18px}.reading-answer-dock small{color:var(--reading-muted)}.exam-shell .answer-drawer{bottom:58px;background:var(--reading-paper);color:var(--reading-text);z-index:30}.exam-shell .answer-head{background:var(--reading-paper);color:var(--reading-text)}
.reading-note-toolbar{position:absolute;inset:0 0 auto;height:70px;display:flex;justify-content:space-between;align-items:center;padding:0 25px;z-index:25;background:#e7eaf0;border-bottom:1px solid #cfd6df;color:#697586;touch-action:none}.reading-note-toolbar>div{display:flex;gap:5px}.reading-note-toolbar>span{font-size:12px}.reading-note-toolbar .icon-button.active{background:#d4dce7;color:#384b63;border-radius:10px}.exam-shell.reading-ink{--reading-paper:#f0f1f4;background:#e2e6ec;touch-action:none}.exam-shell.reading-ink .exam-scroll,.exam-shell.reading-ink .split-scroll,.exam-shell.reading-ink .material-scroll{touch-action:none;scroll-behavior:auto}.exam-shell.reading-ink .qactions{visibility:hidden}.exam-shell .ink-live{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:5;background:transparent}.exam-shell[data-reading=night].reading-ink{--reading-paper:#343d4b;background:#171f2b}.exam-shell[data-reading=night] .reading-note-toolbar{background:#303b4d;border-color:#4b5b73;color:#bfccdf}.exam-shell[data-reading=night] .reading-note-toolbar .icon-button{color:#bfccdf}.exam-shell[data-reading=night] .reading-note-toolbar .icon-button.active{background:#4a5c77;color:#e0e8f3}
.exam-shell .pause-overlay{z-index:60;inset:0;background:#f0f3f7f7;cursor:pointer;color:#6c7784}.exam-shell[data-reading=night] .pause-overlay{background:#1d2530f7;color:#c8d4e4}.exam-shell .pause-card{background:transparent;border:0;box-shadow:none;text-align:center}.exam-shell .pause-card>svg{width:54px;height:54px}.reading-setting-row{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:75px;border-bottom:1px solid #e7ebef;font-size:13px}.reading-setting-row:last-child{border:0}.reading-setting-row>div{display:flex;gap:5px}
.exam-shell,.exam-shell *,#dialog-host .icon-button,#dialog-host .choice-list{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}.choice-native{display:none!important}.choice-button{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;min-height:46px;padding:11px 14px;background:#fff;border:1px solid #dce2e8;border-radius:11px;text-align:left;color:#485360;font:inherit;cursor:pointer}.choice-button span{overflow:hidden;text-overflow:ellipsis}.choice-button svg{width:16px;height:16px;flex-shrink:0}.choice-list{display:grid;gap:5px;max-height:55vh;overflow:auto}.choice-list button{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:44px;padding:12px 15px;border:0;border-radius:10px;background:#f4f6f8;text-align:left;color:#536171}.choice-list button[aria-selected=true]{background:#eaf2fc;color:#4c6e97}.choice-list svg{width:17px;height:17px}.choice-search{width:100%;margin-bottom:13px;padding:12px;border:1px solid #dce2e8;border-radius:10px}.reading-paper-filters{display:grid;gap:10px}.reading-paper-filters label{display:block}.paper-history{font-size:12px;margin:12px 0;color:#78867a}.paper-history summary{cursor:pointer;min-height:36px;line-height:36px}.paper-history summary span{margin-left:12px;color:#667b65}.paper-history .text-button{display:block;min-height:40px}.report-design .difficulty{cursor:default}
@media(max-width:760px){.exam-shell .exam-head{height:64px;min-height:64px;padding:0 9px;gap:6px}.exam-shell .exam-heading{display:none}.exam-shell .exam-head-left,.exam-shell .exam-head-right{gap:3px}.exam-shell .exam-head .icon-button{width:36px;height:44px;min-width:36px;padding:9px}.exam-shell #reading-exit-label{font-size:11px}.exam-shell .exam-clock{font-size:16px}.exam-shell .qhead{padding:12px 15px 2px;flex-wrap:nowrap}.exam-shell .qmain{padding:10px 18px 21px}.exam-shell .qactions{margin-left:auto}.exam-shell .qkind{max-width:110px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.exam-shell .qactions .icon-button{width:40px;height:44px;min-width:40px}.exam-shell .split-shell{top:64px;padding:9px}.exam-shell .split-main{grid-template-columns:1fr;grid-template-rows:38% 62%}.exam-shell .split-pane:first-child{border-right:0;border-bottom:1px solid var(--reading-line)}.exam-shell .split-material-content{padding:19px 22px}.exam-shell .split-questions{padding:4px 4px 12px}.reading-note-toolbar{height:64px;padding:0 10px}.reading-note-toolbar>div{gap:0}.reading-note-toolbar .icon-button{width:36px;min-width:36px;padding:9px}.reading-note-toolbar>span{font-size:10px}.exam-shell .material-content{padding:17px 20px}}
@media(prefers-reduced-motion:reduce){.exam-shell .split-main{transition:none!important}}

#dialog-host .reading-setting-row .button{background:#f1f3f5;color:#56606a;border:1px solid #dce2e8;min-height:44px}#dialog-host .reading-setting-row .button.soft{background:#e4e9ef;color:#3b4651}.exam-shell.reading-ink .qhead{background:var(--reading-paper)}

.exam-shell:not(.reading-ink):not([data-reading=night]){background:linear-gradient(165deg,#fffdf9 0%,var(--ui-background,#f5f8fc) 48%,var(--ui-wash,#edf3fa) 100%)}