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#00000059}.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{box-sizing:border-box;width:100%;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 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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}.iu-sim-notice{color:var(--r-dim);margin:0;font-size:12.5px;line-height:1.55;display:none}.iu-sim-notice a{color:var(--r-accent);text-underline-offset:2px;text-decoration:underline}.iu-sim-notice a:hover{color:var(--r-text)}.runner[data-skin=iu] .iu-sim-notice{display:block}.iu-sim-notice--intro{border-top:1px solid color-mix(in srgb, var(--r-line) 70%, transparent);margin-top:14px;padding-top:14px;font-size:12px}.iu-sim-notice--bar{z-index:40;text-align:center;background:color-mix(in srgb, var(--r-surface) 92%, transparent);border-top:1px solid var(--r-line);backdrop-filter:blur(6px);padding:8px 16px;position:fixed;bottom:0;left:0;right:0}@media (width<=899px){.iu-sim-notice--bar{bottom:var(--dock-height,72px);padding:7px 12px;font-size:11.5px}}.calm-settings{text-align:left;max-width:560px;margin:0 auto 24px}.settings-panel{border:1px solid var(--r-line);border-radius:var(--r-radius);background:color-mix(in srgb, var(--r-accent) 6%, var(--r-surface));padding:20px}.settings-panel-title{color:var(--r-text);margin:0 0 16px;font-size:16px;font-weight:600}.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-block+.setting-block{border-top:1px solid var(--r-line);margin-top:20px;padding-top:20px}.setting-block-head{justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:10px;display:flex}@media 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var(--r-surface));border-radius:12px;flex-shrink:0;width:44px;height:24px;transition:background-color .2s;position:relative}.setting-switch-track:after{content:"";background:var(--r-on-accent);border-radius:50%;width:20px;height:20px;transition:transform .2s;position:absolute;top:2px;left:2px;box-shadow:0 1px 3px #0003}.setting-switch input:checked+.setting-switch-track{background:var(--r-accent)}.setting-switch input:checked+.setting-switch-track:after{transform:translate(20px)}.setting-switch input:focus-visible+.setting-switch-track{outline:2px solid var(--r-accent);outline-offset:2px}.settings-hint{color:var(--r-dim);margin:16px 0 0;font-size:12.5px;line-height:1.55}.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 280px}.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}.q .q-report{z-index:1;color:var(--r-dim);position:absolute;bottom:12px;left:12px}.q .q-report:hover,.q .q-report:focus-visible{color:var(--r-text);background:color-mix(in srgb, var(--r-text) 6%, transparent)}@media (width<=679px){.q:has(.q-report) .q-content{padding-bottom:44px}}@media (width>=680px){.q-meta{border-bottom:0;border-right:.5px solid 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.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}.editor 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.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 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