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12px;display:grid}.exam-shortcuts-card{background:var(--exam-recessed);border:1px solid var(--exam-border);border-radius:12px;grid-template-columns:minmax(0,auto) auto minmax(0,1fr);align-items:center;gap:10px;padding:9px 11px;display:grid}.exam-shortcut-keys,.exam-shortcut-keygroup{align-items:center;gap:4px;display:inline-flex}.exam-shortcut-keys{flex-wrap:wrap}.exam-shortcuts kbd{background:var(--exam-surface);border:1px solid var(--exam-border);color:var(--exam-ink);text-align:center;border-bottom-width:2px;border-radius:6px;min-width:26px;padding:5px 7px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px;font-weight:700}.exam-shortcut-plus,.exam-shortcut-arrow{color:var(--exam-muted);font-size:12px;font-weight:700}.exam-shortcut-action{text-overflow:ellipsis;white-space:nowrap;font-size:13px;font-weight:700;overflow:hidden}.exam-marker-menu-vn{background:var(--exam-surface);border:1px solid var(--exam-control-border);z-index:80;border-radius:10px;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;width:min(280px,100vw - 16px);max-height:calc(100vh - 16px);padding:10px;display:grid;position:fixed;overflow:auto;box-shadow:0 12px 34px #0000003d}.exam-marker-menu-vn[data-measuring=true]{visibility:hidden}.exam-marker-choice{justify-content:flex-start;align-items:center;gap:8px;display:flex}.exam-marker-choice[data-marker-color=yellow]{background:var(--exam-marker-yellow);color:var(--exam-marker-text)}.exam-marker-choice[data-marker-color=green]{background:var(--exam-marker-green);color:var(--exam-marker-text)}.exam-marker-choice[data-marker-color=cyan]{background:var(--exam-marker-cyan);color:var(--exam-marker-text)}.exam-marker-choice[data-marker-color=red]{background:var(--exam-marker-red);color:var(--exam-marker-text)}.exam-marker-choice.active{border-color:var(--exam-accent);box-shadow:0 0 0 2px var(--exam-accent)}.exam-marker-clear,.exam-marker-hint{grid-column:1/-1}.exam-marker-hint{color:var(--exam-muted);margin:0;font-size:12px;font-weight:700;line-height:1.35}.exam-tool-marker-dot{border:1px solid #00000040;border-radius:50%;width:8px;height:8px;display:inline-block}.exam-highlight-yellow,.exam-highlight-green,.exam-highlight-cyan,.exam-highlight-red{border-radius:3px;padding:0 2px}span.exam-highlight-yellow,span.exam-highlight-green,span.exam-highlight-cyan,span.exam-highlight-red{width:24px;height:14px;display:inline-block}.exam-highlight-yellow{background:var(--exam-marker-yellow);color:var(--exam-marker-text)}.exam-highlight-green{background:var(--exam-marker-green);color:var(--exam-marker-text)}.exam-highlight-cyan{background:var(--exam-marker-cyan);color:var(--exam-marker-text)}.exam-highlight-red{background:var(--exam-marker-red);color:var(--exam-marker-text)}.exam-selection-popup{background:var(--exam-surface);border:1px solid var(--exam-control-border);z-index:95;border-radius:10px;align-items:center;gap:4px;padding:5px 6px;animation:90ms ease-out exam-selection-popup-in;display:flex;position:fixed;box-shadow:0 10px 30px #00000047}.exam-selection-popup[data-measuring=true]{visibility:hidden}@keyframes exam-selection-popup-in{0%{opacity:0;transform:translateY(2px)scale(.98)}}@media (prefers-reduced-motion:reduce){.exam-selection-popup{animation:none}}.exam-selection-popup button{color:var(--exam-ink);cursor:pointer;white-space:nowrap;background:0 0;border:0;border-radius:10px;align-items:center;gap:6px;padding:6px 8px;font-size:12px;font-weight:700;display:flex}.exam-selection-popup button:hover,.exam-selection-popup button:focus-visible{background:var(--exam-recessed)}.exam-selection-popup-swatch{padding:6px!important}.exam-selection-popup-rule{background:var(--exam-control-border);width:1px;height:18px}.exam-selection-popup:after{background:var(--exam-surface);border-bottom:1px solid var(--exam-control-border);border-right:1px solid var(--exam-control-border);content:"";height:8px;bottom:-5px;left:clamp(10px, var(--exam-popup-arrow,50%), calc(100% - 18px));width:8px;position:absolute;transform:rotate(45deg)}.exam-selection-popup.is-below:after{border:1px solid var(--exam-control-border);border-bottom:0;border-right:0;top:-5px;bottom:auto}.exam-marker-live{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;margin:0;position:absolute;overflow:hidden}.exam-shell[data-marker-armed=yellow] [data-highlight-pane]{cursor:url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='24'%20height='24'%3E%3Cpath%20d='M3.5%2020.5l1-3.5L15%206.5l3%203L7.5%2020z'%20fill='%23fff3a3'%20stroke='%23161416'%20stroke-width='1.3'%20stroke-linejoin='round'/%3E%3Cpath%20d='M15.5%206l2.5-2.5%203%203L18.5%209z'%20fill='%23161416'/%3E%3C/svg%3E") 4 20,text}.exam-shell[data-marker-armed=yellow] [data-highlight-pane]::selection{background:var(--exam-marker-yellow);color:var(--exam-marker-text)}.exam-shell[data-marker-armed=yellow] [data-highlight-pane] ::selection{background:var(--exam-marker-yellow);color:var(--exam-marker-text)}.exam-shell[data-marker-armed=green] [data-highlight-pane]{cursor:url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='24'%20height='24'%3E%3Cpath%20d='M3.5%2020.5l1-3.5L15%206.5l3%203L7.5%2020z'%20fill='%23bfead8'%20stroke='%23161416'%20stroke-width='1.3'%20stroke-linejoin='round'/%3E%3Cpath%20d='M15.5%206l2.5-2.5%203%203L18.5%209z'%20fill='%23161416'/%3E%3C/svg%3E") 4 20,text}.exam-shell[data-marker-armed=green] [data-highlight-pane]::selection{background:var(--exam-marker-green);color:var(--exam-marker-text)}.exam-shell[data-marker-armed=green] [data-highlight-pane] ::selection{background:var(--exam-marker-green);color:var(--exam-marker-text)}.exam-shell[data-marker-armed=cyan] [data-highlight-pane]{cursor:url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='24'%20height='24'%3E%3Cpath%20d='M3.5%2020.5l1-3.5L15%206.5l3%203L7.5%2020z'%20fill='%23cde7ff'%20stroke='%23161416'%20stroke-width='1.3'%20stroke-linejoin='round'/%3E%3Cpath%20d='M15.5%206l2.5-2.5%203%203L18.5%209z'%20fill='%23161416'/%3E%3C/svg%3E") 4 20,text}.exam-shell[data-marker-armed=cyan] [data-highlight-pane]::selection{background:var(--exam-marker-cyan);color:var(--exam-marker-text)}.exam-shell[data-marker-armed=cyan] [data-highlight-pane] ::selection{background:var(--exam-marker-cyan);color:var(--exam-marker-text)}.exam-shell[data-marker-armed=red] [data-highlight-pane]{cursor:url("data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='24'%20height='24'%3E%3Cpath%20d='M3.5%2020.5l1-3.5L15%206.5l3%203L7.5%2020z'%20fill='%23ffd3d3'%20stroke='%23161416'%20stroke-width='1.3'%20stroke-linejoin='round'/%3E%3Cpath%20d='M15.5%206l2.5-2.5%203%203L18.5%209z'%20fill='%23161416'/%3E%3C/svg%3E") 4 20,text}.exam-shell[data-marker-armed=red] [data-highlight-pane]::selection{background:var(--exam-marker-red);color:var(--exam-marker-text)}.exam-shell[data-marker-armed=red] [data-highlight-pane] ::selection{background:var(--exam-marker-red);color:var(--exam-marker-text)}.exam-image-inspector-window{width:min(960px,100vw - 32px);height:min(680px,100vh - 72px)}.exam-image-inspector-window.is-expanded{border-radius:0;width:100vw;height:100vh;max-height:100vh;top:0!important;left:0!important;transform:none!important}.exam-image-inspector-window .exam-floating-window-body{flex-direction:column;padding:0;display:flex}.exam-image-inspector-viewport{background:var(--exam-recessed);cursor:move;touch-action:none;-webkit-user-select:none;user-select:none;flex:auto;justify-content:center;align-items:center;min-height:340px;display:flex;overflow:hidden}.exam-image-inspector-viewport[data-pannable=true]{cursor:grab}.exam-image-inspector-viewport[data-pannable=true]:active{cursor:grabbing}.exam-image-inspector-viewport img{pointer-events:none;transform-origin:50%;-webkit-user-select:none;user-select:none;max-width:100%;max-height:100%;transition:transform 60ms ease-out;display:block}.exam-image-inspector-toolbar{background:var(--exam-surface);border-top:1px solid var(--exam-border);justify-content:center;align-items:center;gap:4px;padding:10px 12px;display:flex}.exam-image-inspector-toolbar button{color:var(--exam-muted);cursor:pointer;background:0 0;border:1px solid #0000;border-radius:10px;justify-content:center;align-items:center;width:36px;height:34px;padding:0;display:inline-flex}.exam-image-inspector-toolbar button:hover,.exam-image-inspector-toolbar button.is-active{background:var(--exam-accent-soft);border-color:var(--exam-control-border);color:var(--exam-accent)}.exam-image-inspector-toolbar button.is-success{background:var(--exam-positive-soft);color:var(--exam-positive)}.exam-image-inspector-toolbar button.is-error{background:var(--exam-negative-soft);color:var(--exam-negative)}.exam-image-inspector-toolbar span{color:var(--exam-muted);font-variant-numeric:tabular-nums;text-align:center;min-width:44px;font-size:12px;font-weight:700}.exam-image-inspector-toolbar i{background:var(--exam-border);width:1px;height:22px;margin:0 5px;display:block}@media (width<=1100px){.exam-topbar-left-vn{flex:none}.exam-topbar-right-vn{justify-content:flex-start;overflow-x:auto}}@media (width<=960px){.exam-topbar-right-vn{gap:4px}.exam-topbar-right-vn .exam-tool-button{position:relative}.exam-topbar-right-vn .exam-tool-label{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}}@media (width<=760px){.exam-context{min-width:0;position:relative}.exam-item-code{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.exam-unit-meta{text-overflow:ellipsis;white-space:nowrap;width:0;min-width:100%;overflow:hidden}.exam-topbar-vn .exam-nav-button{min-width:0}.exam-stage-vn,.exam-stage-vn.rail-closed,.exam-stage-vn.tool-open,.exam-stage-vn.rail-closed.tool-open{grid-template-columns:1fr}.exam-rail{border-bottom:1px solid var(--exam-border);border-right:0;max-width:100vw;display:flex;overflow:auto hidden}.rail-closed .exam-rail{display:none}.exam-rail-item{border-bottom:0;border-right:1px solid var(--exam-border);flex:0 0 58px}.exam-footer-vn{flex-direction:column;align-items:stretch;gap:8px}.exam-footer-left{justify-content:space-between}.exam-footer-right{justify-content:flex-end}.exam-tool-scrim{display:block}.exam-tool-sheet{border-left:0;border-top:1px solid var(--exam-border);border-radius:12px 12px 0 0;grid-column:auto;width:100%;max-height:82%;animation-name:exam-tool-sheet-up;position:absolute;inset:auto 0 0;box-shadow:0 -18px 44px #16141629}.exam-floating-window{width:calc(100vw - 18px);max-height:calc(100vh - 28px)}.exam-shortcuts-grid{grid-template-columns:minmax(0,1fr)}.exam-shortcut-arrow{display:none}.exam-image-inspector-toolbar{flex-wrap:wrap}}@media (width<=620px){.exam-topbar-vn{gap:6px;padding-left:6px;padding-right:6px}.exam-topbar-left-vn,.exam-topbar-center-vn{gap:6px}.exam-topbar-vn .exam-icon-button,.exam-topbar-vn .exam-nav-button,.exam-topbar-vn .exam-tool-button{padding-left:4px;padding-right:4px}}.app-page{flex-direction:column;gap:2.5rem;display:flex}.app-display{letter-spacing:-.035em;overflow-wrap:anywhere;font-size:clamp(2.25rem,4.5vw,3.5rem);font-weight:760;line-height:1}.app-title{letter-spacing:-.02em;font-size:1.375rem;font-weight:760;line-height:1.15}.app-kicker{text-transform:uppercase;letter-spacing:.14em;color:var(--app-accent);font-size:.75rem;font-weight:700}.app-label{text-transform:uppercase;letter-spacing:.12em;color:var(--app-muted);font-size:.6875rem;font-weight:700}.app-numeral{letter-spacing:-.04em;font-variant-numeric:tabular-nums;font-size:clamp(2.5rem,5vw,4rem);font-weight:250;line-height:1}.app-card{border:1px solid var(--app-border);background:var(--app-surface);border-radius:20px;min-width:0;padding:1.5rem}.app-field{border:1px solid var(--app-control-border);background:var(--app-recessed);max-width:100%;min-height:44px;color:var(--app-ink);accent-color:var(--app-accent);border-radius:12px}.app-field:where([type=checkbox],[type=radio]){flex-shrink:0;width:20px;height:20px;min-height:auto}.app-field::placeholder{color:var(--app-muted);opacity:1}#app-main-content :where(a,button,input,select,textarea,summary):focus-visible{outline:2px solid var(--app-accent);outline-offset:3px}#app-main-content :where(button,a).rounded-full{justify-content:center;align-items:center;min-height:44px}.app-tone,.app-collection-choice,.app-collection-strip{--tone:#f2c14e}[data-tone=tomato]{--tone:#e4572e}[data-tone=teal]{--tone:#1aa595}[data-tone=violet]{--tone:#9d86cc}[data-tone=pink]{--tone:#f4a6c1}[data-tone=lime]{--tone:#c5e063}.app-tone{--app-ink:#141418;--app-muted:#29292f;--app-accent:#141418;--app-border:#14141850;--app-control-border:#141418;--app-surface:var(--tone);--app-bg:var(--tone);--app-recessed:#ffffff30;--app-accent-soft:#ffffff30;--app-primary:#141418;--app-on-primary:#f3eee4;background:var(--tone);color:var(--app-ink);border-color:#0000}.app-collection-card{overflow-wrap:anywhere;border:1px solid #0000;border-radius:20px;flex-direction:column;justify-content:space-between;gap:1.5rem;min-width:0;height:100%;padding:1.5rem;display:flex}.app-collection-card:hover{border-color:#141418}.app-collection-strip{border-left:6px solid var(--tone)}.app-collection-choice{background:var(--app-recessed);border-color:var(--app-control-border);cursor:pointer}.app-collection-choice:has(:checked){--app-accent:#141418;background:var(--tone);color:#141418;--app-muted:#29292f;border-color:#141418}.app-collection-choice:has(:checked) input{accent-color:#141418}.app-access-layout{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:1.5rem;display:grid}.app-notice{border-left:4px solid var(--app-negative)}.app-centered{color:#f3eee4;background:#141418;justify-content:center;align-items:center;min-height:100vh;padding:1.5rem;display:flex}.app-entry{--app-muted:#ccc6bb;--app-primary:#f3eee4;--app-on-primary:#141418;--app-accent-soft:#302e2b;color:#f3eee4;background:#141418;flex-direction:column;justify-content:center;align-items:flex-start;gap:2rem;min-height:100vh;padding:clamp(2rem,8vw,8rem);display:flex}.app-entry-title{letter-spacing:-.045em;font-size:clamp(4rem,10vw,9rem);font-weight:760;line-height:.9}.app-entry-title span{color:#f2c14e}.app-entry p{text-align:left;max-width:34rem;line-height:1.65}.app-entry-actions{flex-wrap:wrap;gap:.75rem;display:flex}.app-entry-actions a:first-child{border-color:#f3eee4}.app-entry a:focus-visible,.app-centered a:focus-visible{outline-offset:4px;outline:2px solid #f2c14e}@media (width<=899px){.app-access-layout{grid-template-columns:1fr}}@media (width<=639px){.app-card,.app-collection-card{border-radius:14px;padding:1.25rem}.app-entry-actions{flex-direction:column;width:100%}.app-entry-actions a{text-align:center}}.app-confirm{border:1px solid var(--app-border);background:var(--app-surface);width:min(30rem,100vw - 2.5rem);color:var(--app-ink);border-radius:20px;margin:auto;padding:1.75rem;box-shadow:0 24px 60px #0005}.app-confirm::backdrop{background:#141418aa}.app-confirm :where(button,input,textarea):focus-visible{outline:2px solid var(--app-accent);outline-offset:3px}.app-admin-workspace{gap:2.5rem;min-width:0;display:grid}.app-admin-header{--app-accent:var(--app-on-chrome);background:var(--app-chrome);color:var(--app-on-chrome);border-radius:20px;min-width:0;padding:1.25rem}.app-admin-eyebrow{text-transform:uppercase;letter-spacing:.14em;padding:.25rem .75rem .75rem;font-size:.75rem;font-weight:700}.app-admin-navigation{scrollbar-width:thin;gap:.25rem;padding:.25rem;display:flex;position:relative;overflow-x:auto}.app-admin-tab{border-radius:999px;flex:none;align-items:center;min-height:44px;padding:.65rem 1rem;font-size:.8125rem;font-weight:600;text-decoration:none;display:inline-flex}.app-admin-tab:hover{background:var(--app-on-chrome)}@supports (color:color-mix(in lab, red, red)){.app-admin-tab:hover{background:color-mix(in srgb, var(--app-on-chrome) 12%, transparent)}}.app-admin-tab[aria-current=page]{background:var(--app-on-chrome);color:var(--app-chrome)}.app-data-table{border:1px solid var(--app-border);background:var(--app-surface);border-radius:20px;overflow-x:auto}.app-data-table tr:hover{background:var(--app-recessed)}@media (width<=767px){.app-admin-header{border-radius:14px;margin-inline:-.5rem;padding:.75rem}.app-data-table{background:0 0;border:0;overflow:visible}.app-data-table table,.app-data-table tbody{display:block}.app-data-table thead{clip-path:inset(50%);width:1px;height:1px;position:absolute;overflow:hidden}.app-data-table tr{border:1px solid var(--app-border);background:var(--app-surface);border-radius:14px;gap:.25rem;margin-bottom:1rem;padding:1rem;display:grid}.app-data-table td{overflow-wrap:anywhere;gap:.35rem;min-width:0;padding:.5rem 0;display:grid}.app-data-table td:before{content:attr(data-label);color:var(--app-muted);text-transform:uppercase;letter-spacing:.12em;font-size:.6875rem;font-weight:700}}.app-editor,.app-editor :where(section,aside,form,li,dd){min-width:0}.app-editor :where(p,dd){overflow-wrap:anywhere}.app-editor-panes{border:1px solid var(--app-border);background:var(--app-surface);border-radius:20px;min-width:0;display:grid;overflow:hidden}.app-editor-list{border-bottom:1px solid var(--app-border);background:var(--app-recessed);min-width:0;padding:1rem}@media (width>=1280px){.app-editor-panes{grid-template-columns:minmax(16rem,20rem) minmax(0,1fr)}.app-editor-list{border-bottom:0;border-right:1px solid var(--app-border)}}.app-question-index{font-size:1.5rem;font-weight:500;line-height:1.2}.app-editor textarea{min-height:9rem}[data-rich-variant=exam] :is(p,ul,ol,table,th,td){color:inherit;font-size:inherit;line-height:inherit;white-space:pre-line}[data-rich-variant=exam] :is(th,td,img){border-color:var(--exam-border)}[data-rich-variant=exam] :is(figcaption,[data-exam-selection-barrier]){color:var(--exam-muted)}[data-rich-variant=exam] [data-exam-selection-barrier]{cursor:auto}.exam-study-notice{color:var(--exam-muted);margin:0 0 1rem;font-size:.8125rem;font-weight:400;line-height:1.5}@property --tw-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-z{syntax:"*";inherits:false;initial-value:0}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}