@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--primary: #16A34A;--primary-hover: #15803D;--primary-soft: #DCFCE7;--bg-base: #F8FAFC;--bg-surface: #FFFFFF;--bg-inset: #F1F5F9;--text-primary: #0F172A;--text-secondary: #475569;--text-tertiary: #64748B;--text-muted: #94A3B8;--border: #E2E8F0;--border-hover: #CBD5E1;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--ease-out-expo: cubic-bezier(.16, 1, .3, 1);--page-padding: 48px 64px}@media(max-width:1024px){:root{--page-padding: 32px 40px}}@media(max-width:768px){:root{--page-padding: 24px 20px}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-base);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{min-height:100vh}h1,h2,h3,h4{font-weight:500;letter-spacing:-.01em}button{font-family:inherit;background:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border);padding:8px 16px;border-radius:var(--radius-sm);cursor:pointer;font-size:14px;font-weight:500;transition:all .15s ease;display:inline-flex;align-items:center;gap:8px}button:hover{background:var(--bg-inset);border-color:var(--border-hover)}button.primary{background:var(--primary);color:#fff;border-color:var(--primary)}button.primary:hover{background:var(--primary-hover)}input{font-family:inherit;background:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border);padding:10px 14px;font-size:14px;border-radius:var(--radius-sm);transition:all .15s ease;width:100%}select,textarea{font-family:inherit;background:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px}select{min-height:42px;padding:8px 12px}textarea{width:100%;min-height:96px;padding:12px 14px;resize:vertical}select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}.qb-shell{padding:var(--page-padding);display:flex;flex-direction:column;gap:18px;min-height:100vh}.qb-header,.qb-toolbar,.qb-question-head,.qb-evidence-head,.qb-nav,.qb-stats,.qb-actions{display:flex;align-items:center;gap:12px}.qb-header{justify-content:space-between;align-items:flex-start;flex-wrap:wrap}.qb-header h2{font-size:clamp(22px,3vw,30px);margin-top:10px}.qb-header p,.qb-muted,.qb-kicker{color:var(--text-tertiary);font-size:13px}.qb-stats{flex-wrap:wrap;justify-content:flex-end}.qb-stats span{background:var(--bg-inset);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;color:var(--text-secondary);font-size:13px;font-weight:600}.qb-toolbar{display:grid;grid-template-columns:minmax(240px,1fr) minmax(150px,180px) minmax(160px,190px);gap:10px}.qb-layout{display:grid;grid-template-columns:minmax(220px,280px) minmax(0,1fr) minmax(320px,42vw);gap:18px;align-items:start}.qb-list{display:flex;flex-direction:column;gap:8px;max-height:calc(100vh - 210px);overflow:auto;padding-right:2px}.qb-list-item{display:grid;grid-template-columns:34px 1fr;gap:2px 8px;text-align:left;padding:10px;background:var(--bg-surface)}.qb-list-item span{grid-row:span 2;width:28px;height:28px;display:grid;place-items:center;border-radius:999px;background:var(--bg-inset);color:var(--text-secondary);font-size:12px;font-weight:700}.qb-list-item strong{font-size:12px;color:var(--primary)}.qb-list-item small{color:var(--text-secondary);line-height:1.35}.qb-list-item.active{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}.qb-question,.qb-evidence,.qb-native-panel{min-width:0}.qb-question{display:flex;flex-direction:column;gap:14px}.qb-question-head,.qb-native-panel,.qb-evidence{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-sm)}.qb-question-head{justify-content:space-between;padding:16px;align-items:flex-start;flex-wrap:wrap}.qb-question-head h3{font-size:20px}.qb-native-panel{padding:18px;display:flex;flex-direction:column;gap:18px}.qb-stem{color:var(--text-primary);font-size:16px;line-height:1.65;white-space:pre-wrap}.qb-options{display:flex;flex-direction:column;gap:10px}.qb-option{width:100%;display:grid;grid-template-columns:36px 1fr;text-align:left;padding:12px}.qb-option span{width:28px;height:28px;display:grid;place-items:center;border-radius:999px;background:var(--bg-inset);font-weight:700}.qb-option em{font-style:normal;color:var(--text-secondary);line-height:1.45}.qb-option.selected{border-color:var(--primary);background:var(--primary-soft)}.qb-option.correct{border-color:#15803d;background:#dcfce7}.qb-option em small{display:block;margin-top:6px;color:var(--text-tertiary);font-size:13px;line-height:1.45}.qb-explanation{border-top:1px solid var(--border);padding-top:16px}.qb-explanation h4{margin-bottom:8px;font-size:14px;font-weight:700}.qb-explanation p,.qb-ocr{white-space:pre-wrap;color:var(--text-secondary)}.qb-resources{border-top:1px solid var(--border);padding-top:16px;display:flex;flex-direction:column;gap:10px}.qb-resources h4{font-size:14px;font-weight:700}.qb-resources p{color:var(--text-secondary)}.qb-note{display:flex;flex-direction:column;gap:8px;color:var(--text-secondary);font-size:13px;font-weight:700}.qb-nav{justify-content:space-between}.qb-evidence{padding:12px;display:flex;flex-direction:column;gap:12px;max-height:calc(100vh - 210px)}.qb-evidence-head{justify-content:space-between}.qb-thumbs{display:flex;flex-wrap:wrap;gap:6px}.qb-thumbs button{width:34px;height:34px;padding:0;justify-content:center}.qb-thumbs button.active{border-color:var(--primary);color:var(--primary);background:var(--primary-soft)}.qb-image-frame{flex:1;min-height:460px;background:var(--bg-inset);border-radius:var(--radius-sm);overflow:hidden;display:flex;align-items:center;justify-content:center}.qb-ocr{min-height:460px;overflow:auto;background:var(--bg-inset);border-radius:var(--radius-sm);padding:14px;font-size:12px;line-height:1.5}.qb-empty{padding:var(--page-padding);max-width:760px}.qb-empty h2{margin-bottom:10px}.qb-empty p{color:var(--text-secondary)}@media(max-width:1180px){.qb-layout{grid-template-columns:minmax(190px,240px) minmax(0,1fr)}.qb-evidence{grid-column:1 / -1;max-height:none}}@media(max-width:760px){.qb-toolbar,.qb-layout{grid-template-columns:1fr}.qb-list{max-height:240px}.qb-image-frame,.qb-ocr{min-height:320px}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:fadeInUp .4s var(--ease-out-expo) forwards}.stagger-1{animation-delay:.05s;opacity:0}.stagger-2{animation-delay:.1s;opacity:0}.stagger-3{animation-delay:.15s;opacity:0}.stagger-4{animation-delay:.2s;opacity:0}.stagger-5{animation-delay:.25s;opacity:0}.card{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:20px;transition:border-color .2s var(--ease-out-expo),background-color .2s var(--ease-out-expo);position:relative}.card:hover{border-color:var(--border-hover)}.card:active{transform:none}button{transition:all .2s var(--ease-out-expo)}button:active{transform:none}@keyframes pulse-teal{0%{box-shadow:0 0 #0d948866}70%{box-shadow:0 0 0 10px #0d948800}to{box-shadow:0 0 #0d948800}}.pulse-active{animation:pulse-teal 2s infinite}@keyframes skeleton-pulse{0%{opacity:.5}50%{opacity:1}to{opacity:.5}}.skeleton{animation:skeleton-pulse 1.5s ease-in-out infinite;background:var(--bg-inset)}@media(max-width:768px){:root{--spacing-multiplier: .8}.mobile-hidden{display:none!important}.card{padding:16px}}@media(max-pointer:coarse){button,input,select{min-height:44px}}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}