.runner{--r-radius:12px;min-height:100dvh;font-family:var(--font-sans);background:var(--r-bg);color:var(--r-text);padding-bottom:60px}.runner[data-skin=calm]{--r-bg:var(--paper);--r-surface:#ffffff03;--r-card:#ffffff03;--r-card-2:#ffffff05;--r-text:var(--ink);--r-dim:var(--ink-dim);--r-line:var(--rule);--r-accent:var(--accent);--r-accent-dim:var(--accent-dim);--r-on-accent:var(--paper);--r-danger:#c2704f;--r-radius:12px}.runner[data-skin=iu]{--r-bg:#e9eef4;--r-surface:#fff;--r-card:#eef3f9;--r-card-2:#fff;--r-text:#1f2329;--r-dim:#5b626b;--r-line:#cfd6de;--r-accent:#2f6fed;--r-accent-dim:#2f6fed;--r-on-accent:#fff;--r-danger:#d23b3b;--r-radius:5px}.runner .katex{color:var(--r-text)}.topbar{border-bottom:.5px solid var(--r-line);background:var(--r-surface);z-index:60;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:12px 20px;display:flex;position:sticky;top:0}.home{color:var(--r-dim);font-size:13px;font-family:var(--font-voice);font-style:italic}.home:hover{color:var(--r-text)}.home-fs-exit{color:var(--r-accent);font-size:13px;font-family:var(--font-sans);cursor:pointer;white-space:nowrap;background:0 0;border:0;padding:0;font-weight:600}.home-fs-exit:hover{text-decoration:underline}.home-fs-exit[hidden],.home[hidden]{display:none!important}.timerwrap{flex:1;justify-content:center;display:flex}.timer{color:var(--r-danger);border:1px solid var(--r-danger);border-radius:var(--r-radius);font-variant-numeric:tabular-nums;padding:5px 12px;font-size:14px}.topright{align-items:center;gap:14px;display:flex}.skin-toggle{display:none}.student{color:var(--r-dim);font-size:12px}.runner[data-skin=calm] .student{display:none}.card{background:var(--r-card);border:.5px solid var(--r-line);border-radius:var(--r-radius)}.runner[data-skin=iu] .card{box-shadow:0 1px 2px #141e320f}.panel{max-width:1080px;margin:0 auto;padding:26px 20px}.intro-card{text-align:center;max-width:720px;margin:24px auto;padding:32px 30px}.intro-title{color:var(--r-text);margin:0;font-size:24px;font-weight:600}.intro-sub{color:var(--r-dim);margin:6px 0 0;font-size:13px}.intro-mode-label{color:var(--r-text);margin:28px 0 14px;font-size:15px;font-weight:600}.mode-picker{text-align:left;grid-template-columns:1fr 1fr;gap:12px;max-width:640px;margin:0 auto 24px;display:grid}@media (width<=560px){.mode-picker{grid-template-columns:1fr}}.mode-opt{border:2px solid var(--r-line);border-radius:var(--r-radius);background:var(--r-surface);cursor:pointer;flex-direction:column;gap:6px;padding:18px 16px;transition:border-color .15s,background-color .15s,box-shadow .15s;display:flex}.mode-opt:hover{border-color:var(--r-accent-dim)}.mode-opt[aria-pressed=true]{border-color:var(--r-accent);background:color-mix(in srgb, var(--r-accent) 10%, var(--r-surface));box-shadow:0 0 0 1px color-mix(in srgb, var(--r-accent) 35%, transparent)}.mode-opt-iu[aria-pressed=true]{border-color:var(--r-danger);background:color-mix(in srgb, var(--r-danger) 8%, var(--r-surface));box-shadow:0 0 0 1px color-mix(in srgb, var(--r-danger) 30%, transparent)}.mode-opt-title{color:var(--r-text);font-size:16px;font-weight:600}.mode-opt-desc{color:var(--r-dim);font-size:12.5px;line-height:1.5}.iu-warning{border:1px solid color-mix(in srgb, var(--r-danger) 45%, var(--r-line));border-radius:var(--r-radius);background:color-mix(in srgb, var(--r-danger) 7%, var(--r-surface));text-align:left;max-width:560px;margin:0 auto 24px;padding:18px 20px}.iu-warning-lead{color:var(--r-danger);margin:0 0 12px;font-size:17px;font-weight:700;line-height:1.4}.iu-rules{color:var(--r-text);margin:0 0 14px;padding-left:1.2em;font-size:13.5px;line-height:1.65}.iu-rules li+li{margin-top:6px}.iu-timing{text-align:left;margin-bottom:0}.calm-settings{text-align:left;max-width:520px;margin:0 auto 24px}.intro-heading{margin:26px 0 12px;font-size:18px;font-weight:600}.intro-text{color:var(--r-dim);max-width:60ch;margin:0 auto 24px;font-size:14px;line-height:1.7}.setting-row{margin-bottom:16px}.setting-label{color:var(--r-text);margin-bottom:8px;font-size:13px;font-weight:500;display:block}.setting-slider{width:100%;accent-color:var(--r-accent)}.setting-value{color:var(--r-accent);font-variant-numeric:tabular-nums;margin-top:8px;font-size:14px;font-weight:600;display:block}.setting-toggle{color:var(--r-text);cursor:pointer;align-items:flex-start;gap:10px;margin-bottom:12px;font-size:13.5px;line-height:1.5;display:flex}.setting-toggle input{accent-color:var(--r-accent);margin-top:3px}.intro-actions{justify-content:center;gap:10px;display:flex}.exam-layout{grid-template-columns:1fr;gap:24px;display:grid}.exam-h{text-align:center;margin:0 0 16px;font-size:20px;font-weight:600}@media (width>=900px){.exam-layout{grid-template-columns:1fr 220px}.rail{order:2}}.q{z-index:0;grid-template-columns:1fr;margin-bottom:16px;display:grid;position:relative;overflow:visible}.q:has(.editor-menu-btn[aria-expanded=true]),.q:has(.editor-submenu-panel:not([hidden])){z-index:25}@media (width>=680px){.q{grid-template-columns:130px 1fr}}.q-meta{border-bottom:.5px solid var(--r-line);background:var(--r-surface);flex-direction:column;gap:4px;padding:16px;display:flex}@media (width>=680px){.q-meta{border-bottom:0;border-right:.5px solid var(--r-line)}}.q-label{color:var(--r-text);font-size:13px;font-weight:600}.q-state,.q-marks,.q-topic{color:var(--r-dim);font-size:11.5px}.q-state[data-answered=true]{color:var(--r-accent)}.q-topic{opacity:.8;margin-top:4px;font-style:italic}.runner[data-topic-hints=off] [data-topic-hint],[data-topic-hint][hidden],.runner[data-formulary-help=off] [data-formulary-help],[data-formulary-help][hidden]{display:none!important}.q-content{padding:18px 18px 16px}.q-prompt{color:var(--r-text);font-size:15px;line-height:1.7}.q-prompt b{font-weight:600}.q-options{border:0;flex-direction:column;gap:2px;margin:16px 0 0;padding:0;display:flex}.opt{cursor:pointer;border-radius:6px;align-items:baseline;gap:10px;padding:9px 12px;transition:background-color .15s;display:flex}.opt:nth-child(odd){background:var(--r-surface)}.opt:hover{background:color-mix(in srgb, var(--r-accent) 8%, transparent)}.opt input{accent-color:var(--r-accent)}.opt-text{color:var(--r-text);font-size:14px}.opt.correct{background:#5e918938}.opt.wrong{background:#c2704f38}.editor{border:.5px solid var(--r-line);border-radius:var(--r-radius);background:var(--r-card-2);margin-top:16px;position:relative;overflow:visible}.editor.is-fullscreen{z-index:55;border:0;border-radius:0;flex-direction:column;margin:0;display:flex;position:fixed;inset:0;overflow:hidden}.runner[data-editor-fullscreen] .editor.is-fullscreen{top:var(--fs-topbar-height,49px)}.runner[data-editor-fullscreen] .rail{display:none}.runner[data-editor-fullscreen] .editor.is-fullscreen .editor-menubar,.runner[data-editor-fullscreen] .editor.is-fullscreen .editor-tools{scrollbar-width:thin;flex-wrap:nowrap;overflow-x:auto}.editor.is-fullscreen .editor-menubar,.editor.is-fullscreen .editor-tools{flex-shrink:0}.editor.is-fullscreen .editor-area{flex:1;min-height:0;overflow:auto}body.editor-fullscreen-lock{overflow:hidden}.runner[data-skin=iu] .editor.is-fullscreen{background:#fff}.editor-menubar{border-bottom:.5px solid var(--r-line);color:var(--r-dim);z-index:10;background:var(--r-surface);flex-wrap:nowrap;gap:0;padding:0 4px;font-size:12.5px;display:flex;position:relative}.runner[data-skin=iu] .editor-menubar{background:#f9fbfd;align-items:stretch;min-height:30px}.editor .editor-menu{flex-shrink:0;position:relative}.editor .editor-menu-btn{color:var(--r-dim);cursor:default;background:0 0;border:0;border-radius:0;height:100%;padding:6px 12px;font-family:inherit;font-size:12.5px;line-height:1.3}.runner[data-skin=iu] .editor .editor-menu-btn{color:#3d444c}.editor .editor-menu-btn:hover,.editor .editor-menu-btn[aria-expanded=true]{background:color-mix(in srgb, var(--r-accent) 14%, transparent);color:var(--r-text)}.editor .editor-dropdown{background:var(--r-card-2);border:.5px solid var(--r-line);border-radius:var(--r-radius);min-width:220px;box-shadow:none;z-index:50;margin-top:0;padding:4px 0;display:block;position:absolute;top:100%;left:0}.editor .editor-dropdown[hidden],.editor .editor-submenu-panel[hidden]{display:none!important}.runner[data-skin=iu] .editor .editor-dropdown{border-color:#c5cdd6;box-shadow:0 4px 14px #0000001f}.editor .editor-menu-item{box-sizing:border-box;width:100%;color:var(--r-text);text-align:left;cursor:default;white-space:nowrap;background:0 0;border:0;align-items:center;gap:8px;padding:6px 16px 6px 28px;font-family:inherit;font-size:12.5px;line-height:1.35;display:flex;position:relative}.editor .editor-menu-item:hover,.editor .editor-menu-item:focus-visible{background:var(--r-accent);color:var(--r-on-accent);outline:none}.editor .editor-menu-item[aria-disabled=true]{opacity:.45;cursor:default;pointer-events:none}.editor .editor-menu-item .mi-check{text-align:center;width:14px;font-size:11px;position:absolute;left:10px}.editor .editor-menu-item .mi-label{flex:1}.editor .editor-menu-item .mi-kbd{opacity:.65;margin-left:auto;padding-left:20px;font-size:11px}.editor .editor-menu-item:hover .mi-kbd,.editor .editor-menu-item:focus-visible .mi-kbd{opacity:.9}.editor .editor-menu-item .mi-chevron{opacity:.55;margin-left:auto;padding-left:8px;font-size:10px}.editor .editor-menu-sep{border-top:.5px solid var(--r-line);height:0;margin:4px 0}.editor .editor-submenu-wrap{position:relative}.editor .editor-submenu-panel{background:var(--r-card-2);border:.5px solid var(--r-line);border-radius:var(--r-radius);z-index:51;min-width:140px;margin-left:-1px;padding:4px 0;display:block;position:absolute;top:0;left:100%}.runner[data-skin=iu] .editor .editor-submenu-panel{border-color:#c5cdd6;box-shadow:0 4px 14px #0000001f}.editor .editor-submenu-panel.placeholder{min-width:120px;min-height:48px;color:var(--r-dim);justify-content:center;align-items:center;padding:12px 14px;font-size:11.5px;display:flex}.editor .table-grid-picker{padding:8px 10px 6px}.editor .table-grid{grid-template-rows:repeat(10,14px);grid-template-columns:repeat(10,14px);gap:2px;display:grid}.editor .table-grid-cell{border:.5px solid var(--r-line);background:var(--r-surface);cursor:pointer;width:14px;height:14px;padding:0}.editor .table-grid-cell.highlight{background:color-mix(in srgb, var(--r-accent) 35%, var(--r-surface));border-color:var(--r-accent)}.editor .table-grid-label{color:var(--r-dim);text-align:center;min-height:14px;margin-top:6px;font-size:11px}.runner[data-skin=iu] .editor{border-color:#b8c5d6;box-shadow:inset 0 0 0 1px #fff9}.runner[data-skin=iu] .editor-tools{background:#f9fbfd;padding:4px 6px}.runner[data-skin=iu] .editor-tools .editor-tool-btn{color:#3d444c}.runner[data-skin=iu] .editor-area{background:#fff;min-height:260px}.editor-tools{border-bottom:.5px solid var(--r-line);background:var(--r-surface);flex-wrap:wrap;align-items:center;gap:1px;padding:4px 6px;display:flex}.editor-tools-sep{background:var(--r-line);flex-shrink:0;width:1px;height:20px;margin:0 3px}.editor-tools .editor-tool-btn{width:28px;height:26px;color:var(--r-dim);cursor:pointer;background:0 0;border:0;border-radius:3px;flex-shrink:0;justify-content:center;align-items:center;padding:0;display:inline-flex}.editor-tools .editor-tool-btn svg{flex-shrink:0;width:18px;height:18px;display:block}.editor-tools .editor-tool-btn svg [fill]:not([fill=none]){fill:currentColor}.editor-tools .editor-tool-btn:hover:not(:disabled){background:color-mix(in srgb, var(--r-accent) 12%, transparent);color:var(--r-text)}.editor-tools .editor-tool-btn[aria-pressed=true]{background:color-mix(in srgb, var(--r-accent) 18%, transparent);color:var(--r-accent)}.editor-tools .editor-tool-btn:disabled{opacity:.38;cursor:not-allowed}.editor-area{min-height:220px;color:var(--r-text);outline:none;padding:12px 14px;font-size:14px;line-height:1.6}.editor-area:empty:before{content:"Write your answer here.";color:var(--r-dim);opacity:.7}.editor-area.show-para-styles>*{outline:1px dotted var(--r-line);outline-offset:2px;min-height:1.2em;position:relative}.editor-area.show-para-styles>:before{content:"¶";color:color-mix(in srgb, var(--r-accent) 50%, var(--r-dim));font-size:10px;line-height:1;position:absolute;top:-2px;left:-16px}.editor-area .inline-eq{padding:0 2px;display:inline-block}.editor-area ul{margin:.35em 0;padding-left:1.6em;list-style-type:disc}.editor-area ol{margin:.35em 0;padding-left:1.6em;list-style-type:decimal}.editor-area li{display:list-item}.editor-area u{text-decoration:underline}.editor-area s,.editor-area strike{text-decoration:line-through}.editor-area u s,.editor-area u strike,.editor-area s u,.editor-area strike u{text-decoration:underline line-through}.editor-area blockquote{border-left:3px solid var(--r-line);margin:.35em 0 .35em 1.5em;padding-left:.75em}.editor-area mark.find-hit{background:color-mix(in srgb, var(--r-accent) 22%, transparent);color:inherit;border-radius:2px;padding:0 1px}.editor-area mark.find-hit.current{background:color-mix(in srgb, var(--r-accent) 55%, transparent);outline:1px solid var(--r-accent)}.find-dialog{z-index:55;background:var(--r-card-2);border:.5px solid var(--r-line);border-radius:var(--r-radius);width:min(420px,100vw - 32px);padding:14px 16px 12px;position:fixed;top:120px;left:50%;transform:translate(-50%);box-shadow:0 8px 28px #0000002e}.find-head{color:var(--r-text);justify-content:space-between;align-items:center;margin-bottom:14px;font-size:15px;font-weight:600;display:flex}.find-close{color:var(--r-dim);cursor:pointer;background:0 0;border:0;padding:0 4px;font-size:18px;line-height:1}.find-row{margin-bottom:10px}.find-label{color:var(--r-dim);margin-bottom:4px;font-size:12px;display:block}.find-input-wrap{align-items:center;gap:6px;display:flex}.find-input{box-sizing:border-box;border:.5px solid var(--r-line);background:var(--r-surface);color:var(--r-text);border-radius:4px;flex:1;padding:6px 8px;font-family:inherit;font-size:13px}.find-nav{flex-direction:column;gap:1px;display:flex}.find-chev{border:.5px solid var(--r-line);background:var(--r-surface);width:26px;height:18px;color:var(--r-dim);cursor:pointer;border-radius:3px;padding:0;font-size:11px;line-height:1}.find-chev:hover:not(:disabled){background:color-mix(in srgb, var(--r-accent) 12%, transparent)}.find-chev:disabled{opacity:.4;cursor:default}.find-counter{color:var(--r-dim);text-align:center;min-width:32px;font-size:11px}.find-foot{flex-wrap:wrap;align-items:center;gap:8px;margin-top:14px;display:flex}.find-opts-wrap{margin-right:auto;position:relative}.find-gear{color:var(--r-dim);cursor:pointer;background:0 0;border:0;border-radius:4px;padding:4px 6px;font-size:14px}.find-gear:hover{background:color-mix(in srgb, var(--r-accent) 10%, transparent)}.find-opts-pop{background:var(--r-card-2);border:.5px solid var(--r-line);border-radius:var(--r-radius);color:var(--r-text);white-space:nowrap;z-index:1;flex-direction:column;gap:6px;margin-bottom:4px;padding:8px 12px;font-size:12px;display:flex;position:absolute;bottom:100%;left:0;box-shadow:0 4px 12px #0000001f}.find-opts-pop label{cursor:pointer;align-items:center;gap:6px;display:flex}.find-btn{padding:6px 12px;font-size:12px}.src-modal,.preview-modal{z-index:50;background:#0a08068c;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.src-dialog,.preview-dialog{background:var(--r-card-2);border:.5px solid var(--r-line);border-radius:var(--r-radius);flex-direction:column;width:100%;max-width:640px;max-height:80vh;display:flex;overflow:hidden}.src-head,.preview-head{color:var(--r-text);border-bottom:.5px solid var(--r-line);justify-content:space-between;align-items:center;padding:14px 18px;font-size:15px;font-weight:600;display:flex}.src-close,.preview-close{color:var(--r-dim);cursor:pointer;background:0 0;border:0;font-size:18px}.src-body{background:var(--r-surface);flex:1;min-height:200px;max-height:50vh;display:flex;overflow:auto}.src-gutter{font-family:var(--font-mono);color:var(--r-dim);text-align:right;user-select:none;border-right:.5px solid var(--r-line);background:color-mix(in srgb, var(--r-line) 30%, var(--r-surface));padding:12px 8px 12px 12px;font-size:13px;line-height:1.5}.src-code{font-family:var(--font-mono);color:var(--r-text);white-space:pre-wrap;word-break:break-word;background:0 0;border:0;flex:1;margin:0;padding:12px 14px;font-size:13px;line-height:1.5;overflow:auto}.src-actions,.preview-actions{border-top:.5px solid var(--r-line);justify-content:flex-end;gap:10px;padding:12px 18px;display:flex}.preview-body{min-height:120px;max-height:55vh;color:var(--r-text);flex:1;padding:16px 20px;font-size:14px;line-height:1.6;overflow:auto}.preview-body .preview-eq-error{color:var(--r-danger);font-family:var(--font-mono);font-size:12px}.help-modal{z-index:50;background:#0a08068c;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.help-modal[hidden]{display:none!important}.help-dialog{background:var(--r-card-2);border:.5px solid var(--r-line);border-radius:var(--r-radius);flex-direction:column;width:100%;max-width:720px;max-height:85vh;display:flex;overflow:hidden}.help-head{color:var(--r-text);border-bottom:.5px solid var(--r-line);justify-content:space-between;align-items:center;padding:14px 18px;font-size:15px;font-weight:600;display:flex}.help-close{color:var(--r-dim);cursor:pointer;background:0 0;border:0;font-size:18px;line-height:1}.help-body{min-height:320px;max-height:58vh;display:flex;overflow:hidden}.help-nav{border-right:.5px solid var(--r-line);background:var(--r-surface);flex-direction:column;flex:0 0 168px;gap:0;padding:12px 0;display:flex}.help-tab{text-align:left;color:var(--r-dim);cursor:pointer;background:0 0;border:0;border-left:3px solid #0000;padding:10px 18px;font-size:13px}.help-tab:hover{color:var(--r-text);background:color-mix(in srgb, var(--r-accent) 6%, transparent)}.help-tab.active{color:var(--r-accent);border-left-color:var(--r-accent);font-weight:600}.help-panels{flex:1;padding:16px 20px 20px;overflow:auto}.help-panel-inner{color:var(--r-text);font-size:13.5px;line-height:1.55}.help-table{border-collapse:collapse;width:100%;font-size:13px}.help-table th,.help-table td{text-align:left;border-bottom:.5px solid var(--r-line);vertical-align:top;padding:9px 12px}.help-table th{color:var(--r-text);background:color-mix(in srgb, var(--r-line) 25%, transparent);font-weight:600}.help-table kbd{font-family:var(--font-mono);color:var(--r-dim);white-space:nowrap;font-size:12px}.help-subhead{color:var(--r-text);margin:18px 0 8px;font-size:14px;font-weight:600}.help-subhead:first-child{margin-top:0}.help-list,.help-feature-list{margin:0 0 12px;padding-left:1.25em}.help-list li,.help-feature-list li{margin:6px 0}.help-note{color:var(--r-dim);margin:14px 0 0;font-size:12.5px}.help-version{color:var(--r-accent);margin:8px 0 0;font-weight:600}.help-actions{border-top:.5px solid var(--r-line);justify-content:flex-end;padding:12px 18px;display:flex}.runner[data-skin=iu] .help-dialog{background:#fff}.runner[data-skin=iu] .help-nav{background:#f9fbfd}.rail{flex-direction:column;gap:14px;display:flex}@media (width>=900px){.rail{align-self:start;position:sticky;top:14px}}.rail-box{background:var(--r-card);border:.5px solid var(--r-line);border-radius:var(--r-radius);padding:14px}.navgrid{grid-template-columns:repeat(7,1fr);gap:4px;margin:0 0 12px;padding:0;list-style:none;display:grid}.navcell{aspect-ratio:1;border:1px solid var(--r-line);background:var(--r-surface);width:100%;color:var(--r-dim);cursor:pointer;border-radius:4px;font-size:12px}.navcell:hover{border-color:var(--r-accent)}.navcell[data-answered=true]{background:color-mix(in srgb, var(--r-accent) 22%, transparent);color:var(--r-text);border-color:var(--r-accent-dim)}.navcell[data-correct=true]{background:#5e91894d}.navcell[data-correct=false]{background:#c2704f4d}.rail-finish,.rail-link{color:var(--r-accent);cursor:pointer;background:0 0;border:0;padding:0;font-family:inherit;font-size:13px;text-decoration:none}a.rail-link:hover{text-decoration:underline}.rail-formulary{margin-top:10px}.rail-note{color:var(--r-dim);margin:0 0 6px;font-size:13px}.exam-foot{justify-content:center;gap:10px;margin-top:18px;display:flex}.btn{border-radius:var(--r-radius);border:.5px solid var(--r-line);cursor:pointer;color:var(--r-text);background:0 0;padding:9px 20px;font-size:14px}.btn-primary{background:var(--r-accent);color:var(--r-on-accent);border-color:var(--r-accent)}.runner[data-skin=calm] .btn-primary{background:color-mix(in srgb, var(--r-accent) 16%, transparent);color:var(--r-accent);border-color:var(--r-accent-dim)}.btn-primary:hover{filter:brightness(1.05)}.btn-ghost{color:var(--r-dim)}.btn-ghost:hover{color:var(--r-text);border-color:var(--r-accent-dim)}.review-summary{margin-bottom:18px;padding:18px 20px}.review-summary h2{margin:0 0 8px;font-size:18px}.review-summary .score-big{color:var(--r-accent);font-size:26px;font-weight:600}.review-summary p{color:var(--r-dim);margin:6px 0 0;font-size:13px;line-height:1.6}.q-review{border-top:.5px solid var(--r-line);margin-top:16px;padding-top:14px}.verdict{font-size:14px;font-weight:500}.verdict.ok{color:#6f8f6a}.verdict.no{color:#c2704f}.runner[data-skin=iu] .verdict.ok{color:#2e7d4f}.runner[data-skin=iu] .verdict.no{color:#c0392b}.model-head{text-transform:uppercase;letter-spacing:.4px;color:var(--r-accent);margin-bottom:10px;font-size:12px}.model-step{color:var(--r-dim);justify-content:space-between;gap:12px;margin-bottom:8px;font-size:13.5px;line-height:1.6;display:flex}.model-step-text{flex:1}.model-step-pts{color:var(--r-accent);opacity:.85;flex-shrink:0;font-size:11px}.model-answer{color:var(--r-text);margin-top:10px;font-size:14px}.model-answer-label{color:var(--r-dim);margin-right:6px}.selfscore{color:var(--r-dim);margin-top:14px;font-size:13px}.selfscore input{border:.5px solid var(--r-line);background:var(--r-card-2);width:64px;color:var(--r-text);border-radius:6px;margin:0 8px;padding:5px 8px;font-size:14px}.review-actions{margin-top:14px}.pdf-export-host{z-index:100001;pointer-events:none;background:#1a17148c;padding:24px 16px;position:fixed;inset:0;overflow:auto}.pdf-export-status{color:#1a1714;background:#fff;border-radius:8px;margin:0;padding:8px 14px;font-size:14px;position:fixed;top:16px;left:50%;transform:translate(-50%);box-shadow:0 4px 20px #0003}.pdf-export{color:#1a1714;background:#fff;width:210mm;max-width:100%;margin:0 auto;padding:16px 20px;font-family:Georgia,Times New Roman,serif;font-size:13px;line-height:1.6}.pdf-export-header{border-bottom:1px solid #ddd;margin-bottom:20px;padding-bottom:12px}.pdf-export-title{color:#1a1714;margin:0 0 4px;font-size:20px;font-weight:600}.pdf-export-meta{color:#666;margin:0;font-size:12px}.pdf-export .review-summary,.pdf-export .q.card{break-inside:avoid;page-break-inside:avoid;background:#fff;border:1px solid #e0dcd4;border-radius:8px;margin-bottom:16px;padding:16px 18px}.pdf-export .review-summary h2{color:#1a1714}.pdf-export .review-summary .score-big{color:#5a4a32}.pdf-export .review-summary p{color:#444}.pdf-export .q-meta{color:#666;margin-bottom:8px;font-size:12px}.pdf-export .q-label{color:#1a1714;font-weight:600}.pdf-export .q-marks{margin-left:8px}.pdf-export .q-prompt{color:#1a1714;margin-bottom:12px}.pdf-export .q-review{border-top:1px solid #e0dcd4;margin-top:14px;padding-top:12px}.pdf-export .verdict.ok{color:#2e7d4f}.pdf-export .verdict.no{color:#c0392b}.pdf-export .opt.correct{color:#2e7d4f}.pdf-export .opt.wrong{color:#c0392b}.pdf-export .model-head{color:#5a4a32}.pdf-export .model-step,.pdf-export .model-answer{color:#333}.pdf-export .pdf-mcq-answer,.pdf-export .pdf-answer,.pdf-export .pdf-selfscore{color:#333;margin:8px 0;font-size:13px}.pdf-export .pdf-answer{background:#f8f6f2;border:1px solid #e8e4dc;border-radius:6px;padding:10px 12px}.calc{z-index:40;background:var(--r-card-2);border:.5px solid var(--r-line);user-select:none;border-radius:10px;width:280px;position:fixed;top:90px;right:30px;overflow:hidden;box-shadow:0 18px 50px #00000059}.calc-bar{background:var(--r-surface);border-bottom:.5px solid var(--r-line);color:var(--r-dim);cursor:move;justify-content:space-between;align-items:center;padding:8px 12px;font-size:12px;display:flex}.calc-close{color:var(--r-dim);cursor:pointer;background:0 0;border:0;font-size:16px}.calc-display{font-family:var(--font-mono);text-align:right;color:var(--r-text);white-space:nowrap;min-height:24px;padding:12px 14px;font-size:18px;overflow-x:auto}.calc-mode{color:var(--r-dim);gap:14px;padding:0 14px 8px;font-size:12px;display:flex}.calc-keys{background:var(--r-line);border-top:.5px solid var(--r-line);grid-template-columns:repeat(4,1fr);gap:1px;display:grid}.calc-keys button{background:var(--r-card-2);color:var(--r-text);cursor:pointer;border:0;padding:11px 0;font-size:14px}.calc-keys button:hover{background:color-mix(in srgb, var(--r-accent) 12%, transparent)}.calc-keys button.op{color:var(--r-accent)}.calc-keys button.eq{background:var(--r-accent);color:var(--r-on-accent)}.ins-overlay{z-index:50;background:#0a08068c;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.ins-overlay[hidden]{display:none!important}.ins-dialog{background:var(--r-card-2);border:.5px solid var(--r-line);border-radius:var(--r-radius);width:100%;max-width:520px;max-height:90vh;padding:18px 20px;overflow:auto;box-shadow:0 12px 40px #0003}.ins-dialog-wide{max-width:680px}.ins-dialog-sm{max-width:400px}.ins-dialog-eq{max-width:720px}.ins-dialog-mf{max-width:640px}.ins-head{color:var(--r-text);margin-bottom:14px;font-size:15px;font-weight:600}.ins-head-row{justify-content:space-between;align-items:center;margin-bottom:14px;display:flex}.ins-head-row .ins-head{margin-bottom:0}.ins-x{color:var(--r-dim);cursor:pointer;background:0 0;border:0;font-size:18px;line-height:1}.ins-label{color:var(--r-dim);margin-bottom:12px;font-size:12px;display:block}.ins-hint{color:var(--r-dim);margin:0 0 12px;font-size:13px}.ins-select,.ins-input,.ins-textarea,.ins-search{box-sizing:border-box;border:.5px solid var(--r-line);background:var(--r-surface);width:100%;color:var(--r-text);border-radius:4px;margin-top:4px;padding:8px 10px;font-family:inherit;font-size:13px;display:block}.ins-textarea{font-family:var(--font-mono);resize:vertical;min-height:100px}.ins-actions{justify-content:flex-end;gap:10px;margin-top:16px;display:flex}.ins-picker{gap:12px;min-height:280px;display:flex}.ins-cats{flex-direction:column;flex-shrink:0;gap:4px;min-width:130px;display:flex}.ins-cats .cat-btn{border:.5px solid var(--r-line);background:var(--r-surface);color:var(--r-text);text-align:left;cursor:pointer;border-radius:14px;padding:6px 10px;font-family:inherit;font-size:12px}.ins-cats .cat-btn.active{background:var(--r-text);color:var(--r-card-2);border-color:var(--r-text)}.runner[data-skin=iu] .ins-cats .cat-btn.active{color:#fff;background:#3d444c}.ins-picker-main{flex-direction:column;flex:1;gap:8px;min-width:0;display:flex}.ins-glyph-grid{border:.5px solid var(--r-line);background:var(--r-surface);border-radius:4px;grid-template-columns:repeat(auto-fill,minmax(36px,1fr));gap:4px;max-height:320px;padding:4px;display:grid;overflow-y:auto}.ins-glyph-grid .glyph-btn{border:.5px solid var(--r-line);background:var(--r-card-2);color:var(--r-text);cursor:pointer;border-radius:4px;min-height:34px;padding:2px;font-family:inherit;font-size:16px}.ins-glyph-grid .glyph-btn:hover{border-color:var(--r-accent);background:color-mix(in srgb, var(--r-accent) 10%, var(--r-card-2))}.eq-tabs{border-bottom:.5px solid var(--r-line);gap:0;margin-bottom:10px;display:flex}.eq-tabs .eq-tab{color:var(--r-dim);cursor:pointer;background:0 0;border:0;border-bottom:2px solid #0000;margin-bottom:-.5px;padding:8px 14px;font-family:inherit;font-size:12.5px}.eq-tabs .eq-tab.active{color:var(--r-accent);border-bottom-color:var(--r-accent);font-weight:600}.eq-palette{border:.5px solid var(--r-line);background:var(--r-surface);border-radius:4px;flex-wrap:wrap;gap:4px;min-height:72px;margin-bottom:14px;padding:8px;display:flex}.eq-palette .eq-pal-btn{border:.5px solid color-mix(in srgb, var(--r-accent) 35%, var(--r-line));background:color-mix(in srgb, var(--r-accent) 6%, var(--r-card-2));cursor:pointer;min-width:36px;min-height:32px;color:var(--r-text);border-radius:4px;padding:2px 6px;font-size:13px}.eq-palette .eq-pal-btn:hover{border-color:var(--r-accent)}.eq-palette .eq-pal-btn-matrix{min-width:52px;padding:4px 6px}.eq-palette .eq-pal-btn-matrix .katex{font-size:.85em}.eq-preview-box{border:.5px solid var(--r-line);background:color-mix(in srgb, var(--r-line) 25%, var(--r-surface));min-height:48px;color:var(--r-text);border-radius:4px;justify-content:center;align-items:center;margin-bottom:8px;padding:12px;display:flex}.mf-mount{margin-bottom:12px}.mf-mount math-field{border:.5px solid var(--r-line);background:var(--r-surface);border-radius:4px;width:100%;padding:8px;font-size:18px}.editor-area .mce-pagebreak{border-top:2px dashed var(--r-line);height:0;margin:12px 0;display:block}.editor-area .mce-anchor{color:var(--r-accent);font-size:12px;text-decoration:none;display:inline}.editor-area table{border-collapse:collapse;width:100%}.editor-area td,.editor-area th{border:1px solid var(--r-line,#cfd6de);vertical-align:top;min-width:24px;padding:6px 8px}.editor-area td.cell-sel,.editor-area th.cell-sel{outline:2px solid var(--r-accent);outline-offset:-2px;background:color-mix(in srgb, var(--r-accent) 12%, transparent)}.tbl-prop-overlay{z-index:10000;background:#00000059;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.tbl-prop-dialog{background:var(--r-card-2);color:var(--r-text);border:.5px solid var(--r-line);border-radius:var(--r-radius);min-width:280px;max-width:480px;box-shadow:0 8px 32px #0003}.tbl-prop-head{border-bottom:.5px solid var(--r-line);padding:12px 16px;font-weight:600}.tbl-prop-body{flex-direction:column;gap:12px;padding:16px;display:flex}.tbl-prop-foot{border-top:.5px solid var(--r-line);justify-content:flex-end;gap:8px;padding:12px 16px;display:flex}.tbl-prop-field label{color:var(--r-dim);margin-bottom:4px;font-size:12px;display:block}.tbl-prop-field input,.tbl-prop-field select{border:.5px solid var(--r-line);background:var(--r-surface);width:100%;color:var(--r-text);border-radius:6px;padding:6px 8px;font-family:inherit;font-size:13px}