.qb-grid-wrap{display:grid!important;grid-template-columns:1fr 310px!important;align-items:stretch!important;gap:20px;width:100%;max-width:1400px;margin:0 auto;padding:24px 64px;background-color:#fff;min-height:80vh}@media(min-width:1440px){.qb-grid-wrap{grid-template-columns:1fr 360px!important;gap:28px;padding:32px 96px}}@media(max-width:1366px){.qb-grid-wrap{grid-template-columns:1fr 390px!important;gap:16px;padding:16px 56px}}@media(max-width:786px){.qb-grid-wrap{display:flex!important;flex-direction:column;align-items:stretch;gap:16px;padding:16px;grid-template-columns:none!important;background-color:#fff}}.qb-column-main{min-width:0;display:flex;flex-direction:column;height:100%}.qb-column-side{position:static;height:auto;width:100%}@media(max-width:786px){.qb-column-side{order:-1;margin-bottom:0}}.qb-header-card,.qb-main-card,.qb-sidebar-card{background:#fff;border-radius:16px;border:none;padding:24px;margin-bottom:20px;box-shadow:0 4px 6px -1px #0000000d,0 2px 4px -2px #0000000d}.qb-header-card{padding:18px 24px}@media(max-width:786px){.qb-main-card{padding:20px;border-radius:12px}}.qb-stem{font-size:1.05rem;line-height:1.5;color:#374151;font-weight:400;margin-bottom:20px;text-align:left}.qb-option{width:100%;min-height:52px;text-align:left;padding:14px 20px;display:flex;align-items:center;gap:14px;margin-bottom:12px;position:relative;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);border:none;background-color:#fff;border-radius:12px;overflow:hidden;box-shadow:0 1px 3px #0000000d}.qb-option:last-child{margin-bottom:0}.qb-option:disabled{opacity:1!important;cursor:default}.qb-option:hover:not(:disabled){background-color:#f1f5f9;transform:translateY(-1px);box-shadow:0 4px 6px -1px #0000001a}.qb-option--chosen{background-color:#f1f5f9}.qb-option--correct{background-color:#dcfce7!important;color:#166534!important}.qb-option--wrong{background-color:#fee2e2!important;color:#991b1b!important}.qb-option-fill{position:absolute;inset:0;width:0%;background:#00000008;transition:width .6s cubic-bezier(.4,0,.2,1);z-index:0}.qb-option-text{flex-grow:1;font-size:1rem;color:#000;z-index:1}.qb-nav-controls{display:flex;align-items:center;justify-content:space-between;margin-top:32px;width:100%;gap:16px}.ctrl-side{flex:1;display:flex}.ctrl-side.left{justify-content:flex-start}.ctrl-side.right{justify-content:flex-end}.ctrl-center{flex:0 1 auto;display:flex;justify-content:center}.nav-arrow{width:52px;height:52px;display:flex;align-items:center;justify-content:center;font-size:2.2rem;padding:0;line-height:1;border-radius:16px;background:#fff;border:none;color:#64748b;transition:all .2s;box-shadow:0 1px 3px #0000001a}.nav-arrow:hover:not(:disabled){background:#f8fafc;color:#1e293b;transform:translateY(-1px);box-shadow:0 4px 6px #0000000d}.filter-controls{display:flex;padding:4px;gap:4px;background:#f1f5f9;border-radius:10px}.filter-btn{flex:1;padding:8px 4px;border:none;background:transparent;border-radius:8px;font-size:13px;font-weight:500;color:#64748b;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:6px}.filter-btn.active{background:#fff;color:#0f172a;font-weight:600;box-shadow:0 1px 2px #0000000d}.filter-btn:hover:not(.active){background:#ffffff80;color:#334155}.qb-header{display:flex!important;align-items:center;gap:8px;margin-top:0;width:100%;justify-content:space-between}.qb-header-info{display:flex;flex-direction:column;gap:2px;margin-right:auto}.qb-header-actions{display:flex;align-items:center;gap:10px}.qb-header .topic{color:#333;margin:0!important;font-size:1.6rem;font-weight:800;line-height:1.2}.qb-counter{color:#64748b;font-size:.95rem;font-weight:500;font-family:inherit}.qb-counter b,.qb-counter .current-q-num{color:var(--ink);font-weight:700}.qb-header .icon.circle,.qb-option .icon.circle{width:16px;height:16px;display:flex;align-items:center;justify-content:center;object-fit:contain;opacity:.6;transition:opacity .2s;z-index:2}.qb-option .icon.circle.dot{opacity:1;filter:brightness(0)}.qb-option .radio{display:flex;align-items:center;justify-content:center;flex-shrink:0;z-index:2}.qb-option .pctBadge{position:absolute;right:12px;top:50%;transform:translateY(-50%);font-size:.9rem;font-weight:700;width:44px;height:28px;display:inline-flex;align-items:center;justify-content:center;border-radius:6px;border:1px solid #000;background:#fff;z-index:2;color:#000}.qb-timer-container{background:#fff;border-radius:12px;border:1px solid #e2e8f0;padding:18px;margin-bottom:16px;text-align:center;display:flex;flex-direction:column;gap:4px}.qb-timer-display{font-size:2rem;font-weight:800;letter-spacing:1px;color:#1e293b;font-family:inherit}.qb-timer-label{font-size:.8rem;font-weight:600;color:#64748b;text-transform:uppercase;letter-spacing:.5px}.qb-grid-container{width:100%}.qb-grid{position:relative;display:flex;flex-wrap:wrap;gap:8px;justify-content:center;max-height:25vh;overflow-y:auto;padding:16px;border:1px solid #e2e8f0;border-radius:12px;background:#fdfdfd}.qb-grid-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:8px;font-weight:600;font-size:13px;cursor:pointer;transition:all .2s;border:1px solid #e2e8f0;background:#fff;color:#475569;padding:0}.qb-grid-btn:hover:not(:disabled){background:#f1f5f9;border-color:#cbd5e1}.qb-grid-btn.current{border-color:#2563eb!important;color:#2b63eb!important;font-weight:700;transform:scale(1.05)}.qb-grid-btn.answered{background-color:#f1f5f9;color:#94a3b8}.qb-grid-btn.correct{background-color:#dcfce7!important;color:#166534!important;border-color:#86efac!important}.qb-grid-btn.wrong{background-color:#fee2e2!important;color:#991b1b!important;border-color:#fca5a5!important}.qb-grid-btn.flagged{border:2px solid #ef4444!important}@media(max-width:786px){.qb-grid{padding:12px;max-height:15vh}}.qb-explanation-section{grid-column:1 / -1!important;width:100%;margin-top:24px}.qb-explanation-header{margin-bottom:20px;border-bottom:1px solid #f1f5f9;padding-bottom:12px}.qb-explanation-title{font-size:2rem;font-weight:700;color:#333;margin:0}.qb-explanation-content{font-size:1rem;line-height:1.6;color:#334155;margin-bottom:24px}.qb-explanation-content 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table{width:100%;border-collapse:collapse;margin:1.5em 0;font-size:.85em;border:1px solid #e5e7eb;border-radius:8px;overflow:hidden;box-shadow:0 1px 3px #0000000d}.markdown-display th{background:linear-gradient(135deg,#f0f9ff,#eff6ff);color:#1e293b;font-weight:600;text-transform:uppercase;font-size:.85em;border-bottom:2px solid #3b82f6;border-left:1px solid #e2e8f0;padding:8px 16px;text-align:left}.markdown-display th:first-child{border-left:none}.markdown-display td{padding:8px 16px;border-bottom:1px solid #e2e8f0;border-left:1px solid #e2e8f0;color:#334155;vertical-align:top}.markdown-display td:first-child{border-left:none}.markdown-display tr:last-child td{border-bottom:none}.markdown-display tr:nth-child(2n){background-color:#f8fafc}.markdown-display tr:hover{background-color:#f1f5f9}.markdown-display .table-scroll-wrapper{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:1.5em 0;border-radius:8px}.markdown-display .table-scroll-wrapper table{margin:0;min-width:450px}