#view-test{height:100vh;min-height:100vh;overflow:hidden;user-select:none;-webkit-user-select:none;-webkit-user-drag:none}#view-test input[type=text],#view-test input[type=number],#view-test .cbt-num-input{user-select:text!important;-webkit-user-select:text!important}.cbt-container{display:flex;flex-direction:column;height:100vh;width:100vw;background:var(--cbt-body-bg)}.cbt-header{background:var(--cbt-header-bg);color:#fff;padding:10px 24px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--cbt-border);z-index:10}.cbt-branding{display:flex;align-items:center;gap:16px}.badge-aurora-wrapper{position:relative;display:inline-flex;align-items:center;justify-content:center;padding:1px;border-radius:8px;background:linear-gradient(135deg,#38bdf8,#6366f1,#38bdf81a);box-shadow:0 0 16px -2px #38bdf833}.badge-aurora-inner{background:radial-gradient(circle at top left,#0f1c32,#080f1e);color:#f8fafc;font-size:13px;font-weight:700;letter-spacing:.04em;padding:8px 18px;border-radius:7px;white-space:nowrap}.exam-title-box h3{font-size:1.05rem;color:#fff;margin-bottom:2px}.cbt-header-right{display:flex;align-items:center;gap:12px}.cbt-timer-box{background:#090d16;border:1px solid rgba(255,255,255,.15);padding:6px 18px;border-radius:8px;text-align:right}.timer-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.5px;color:#93c5fd}.timer-digits{font-family:var(--font-mono);font-size:1.35rem;font-weight:700;color:#38bdf8}.cbt-palette-toggle-btn{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:#1e293b;border:1px solid rgba(255,255,255,.2);color:#fff;border-radius:var(--radius-md);font-weight:600;font-size:.85rem;cursor:pointer;transition:all var(--transition-fast)}.cbt-palette-toggle-btn:hover{background:#334155;border-color:#38bdf8}.cbt-palette-resizer{width:8px;background:var(--cbt-border);cursor:col-resize;display:flex;align-items:center;justify-content:center;transition:background .15s;user-select:none;-webkit-user-select:none;touch-action:none;z-index:15;flex-shrink:0}.cbt-palette-resizer:hover,.cbt-palette-resizer:active{background:#38bdf8}.resizer-handle{width:2px;height:32px;background:#ffffff4d;border-radius:1px}.cbt-sidebar.collapsed{display:none!important}.fullscreen-lockout-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#0a0e17f2;backdrop-filter:blur(8px);z-index:99999;display:flex;align-items:center;justify-content:center;padding:24px}.lockout-card{background:#111827;border:2px solid #ef4444;border-radius:16px;padding:32px;max-width:480px;text-align:center;box-shadow:0 20px 50px #000c}.lockout-badge{display:inline-block;background:#ef444426;color:#ef4444;border:1px solid rgba(239,68,68,.3);padding:4px 12px;border-radius:20px;font-size:.8rem;font-weight:800;letter-spacing:.5px;margin-bottom:16px}.lockout-card h2{font-size:1.4rem;color:#fff;margin-bottom:12px}.lockout-card p{color:var(--text-secondary);font-size:.95rem;line-height:1.6;margin-bottom:24px}.btn-lockout-resume{width:100%;padding:14px 20px;background:#2563eb;color:#fff;border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:700;cursor:pointer;box-shadow:0 4px 14px #2563eb66;transition:background .2s}.btn-lockout-resume:hover{background:#1d4ed8}.cbt-body{display:flex;flex:1;overflow:hidden}.cbt-main-area{flex:1;display:flex;flex-direction:column;border-right:2px solid var(--cbt-border);background:var(--cbt-question-bg);--cbt-font-scale: 1}.cbt-section-bar{display:flex;justify-content:space-between;align-items:center;padding:8px 20px;background:#0b1120;border-bottom:2px solid var(--cbt-border);gap:16px;flex-wrap:wrap}.cbt-section-tabs{display:flex;gap:8px;align-items:center}.cbt-sec-tab{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;background:#1e293b;border:1px solid rgba(255,255,255,.15);border-radius:var(--radius-md);color:var(--text-secondary);font-size:.88rem;font-weight:600;cursor:pointer;transition:all .2s ease}.cbt-sec-tab:hover{background:#334155;color:#fff;border-color:#38bdf8}.cbt-sec-tab.active{background:#0284c7;color:#fff;border-color:#38bdf8;box-shadow:0 0 12px #0284c766}.cbt-sec-tab .sec-badge{background:#00000040;padding:2px 7px;border-radius:4px;font-size:.76rem;letter-spacing:.5px;font-weight:700;text-transform:uppercase}.cbt-sec-tab.active .sec-badge{background:#0369a1;color:#fff}.cbt-sec-tab .sec-count-badge{background:#ffffff1a;padding:1px 6px;border-radius:10px;font-size:.74rem}.palette-sec-divider{grid-column:1 / -1;display:flex;justify-content:space-between;align-items:center;font-family:var(--font-mono);font-size:.74rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#94a3b8;padding:12px 2px 6px;margin:4px 0 2px;border-bottom:1px solid rgba(255,255,255,.08);background:transparent;text-align:left}.palette-sec-range{color:#64748b;font-size:.72rem;font-weight:600}.cbt-question-nav-strip{display:flex;justify-content:space-between;align-items:center;padding:12px 24px;background:var(--bg-surface-subtle);border-bottom:1px solid var(--cbt-border);gap:12px}.q-meta{display:flex;align-items:center;gap:12px}.q-number-pill{background:#3b82f626;border:1px solid rgba(59,130,246,.4);color:#60a5fa;padding:4px 10px;border-radius:6px;font-weight:800;font-size:.78rem;font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase}.q-nav-right-controls{display:flex;align-items:center;gap:16px}.cbt-font-resizer{display:inline-flex;align-items:center;gap:4px;background:#090d16;border:1px solid rgba(255,255,255,.18);border-radius:var(--radius-md);padding:3px 8px;user-select:none}.font-resizer-label{font-size:.72rem;color:var(--text-muted);font-weight:700;text-transform:uppercase;letter-spacing:.5px;margin-right:2px}.font-btn{background:#1e293b;border:1px solid rgba(255,255,255,.15);color:#f1f5f9;font-size:.8rem;font-weight:700;padding:2px 7px;border-radius:6px;cursor:pointer;line-height:1.3;transition:all .15s ease}.font-btn:hover{background:#0284c7;color:#fff;border-color:#38bdf8}.font-size-badge{font-size:.8rem;font-weight:700;color:#38bdf8;min-width:38px;text-align:center;font-family:var(--font-mono)}.font-btn-reset{background:transparent;border:none;color:var(--text-muted);font-size:.82rem;padding:2px 5px;cursor:pointer;border-radius:6px;transition:color .15s}.font-btn-reset:hover{color:#f59e0b}.q-marks-scheme{display:flex;align-items:center;gap:6px;font-weight:700}.mark-pos{background:#10b9811f;border:1px solid rgba(16,185,129,.35);color:#34d399;font-weight:800;border-radius:4px;padding:2px 7px;font-family:var(--font-mono);font-size:.78rem}.mark-neg{background:#ef44441f;border:1px solid rgba(239,68,68,.35);color:#f87171;font-weight:800;border-radius:4px;padding:2px 7px;font-family:var(--font-mono);font-size:.78rem}.cbt-question-scroll{flex:1;overflow-y:auto;padding:28px}.question-stem,.question-main-statement{font-size:calc(1.12rem * var(--cbt-font-scale, 1));line-height:calc(1.75 * var(--cbt-font-scale, 1));margin-bottom:24px;color:#f8fafc;font-weight:500;letter-spacing:-.005em}.question-stem strong,.question-main-statement strong,.preview-q-text strong{font-weight:700}.cbt-plotly-container{display:block;width:100%;max-width:520px;height:280px;margin:16px auto 28px;flex-shrink:0;box-sizing:border-box}.graph-parse-error{display:block;margin:12px 0;padding:10px 16px;background:#ef44441f;border:1px solid rgba(239,68,68,.4);border-radius:8px;color:#ef4444;font-size:.9rem;font-family:monospace}.options-wrapper{display:flex;flex-direction:column;gap:14px}.cbt-option-item{position:relative;display:flex;align-items:center;gap:16px;padding:13px 18px;background:#141c2c;border:1px solid #232f46;border-radius:12px;cursor:pointer;user-select:none;transition:background var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast)}.cbt-option-item:hover{border-color:#3b82f6;background:#182338}.cbt-option-item.is-selected,.cbt-option-item:has(input:checked){background:#8db0f814;border-color:#8db0f8;box-shadow:0 0 0 1px #8db0f840,0 4px 16px #00000059}.cbt-hidden-input{position:absolute;opacity:0;pointer-events:none;width:0;height:0;margin:0}.cbt-opt-badge{width:38px;height:38px;min-width:38px;display:flex;align-items:center;justify-content:center;background:#232f44;border:1px solid rgba(255,255,255,.08);border-radius:8px;color:#94a3b8;font-size:1.05rem;font-weight:700;font-family:var(--font-sans);flex-shrink:0;transition:all var(--transition-fast)}.cbt-option-item:hover .cbt-opt-badge{color:#f1f5f9;border-color:#ffffff2e}.cbt-option-item.is-selected .cbt-opt-badge,.cbt-option-item:has(input:checked) .cbt-opt-badge{background:#93c5fd;border-color:#93c5fd;color:#0f172a;font-weight:800;box-shadow:0 2px 8px #93c5fd59}.cbt-option-label{cursor:pointer;font-size:calc(1.02rem * var(--cbt-font-scale, 1));line-height:calc(1.6 * var(--cbt-font-scale, 1));flex:1;color:#f1f5f9}.cbt-opt-indicator{width:24px;height:24px;min-width:24px;border-radius:6px;background:#232f44;border:1px solid rgba(255,255,255,.12);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all var(--transition-fast);color:transparent}.cbt-opt-indicator .cbt-check-svg{width:15px;height:15px;stroke:#0f172a;stroke-width:2.8;stroke-linecap:round;stroke-linejoin:round;opacity:0;transform:scale(.65);transition:all var(--transition-fast)}.cbt-option-item.is-selected .cbt-opt-indicator,.cbt-option-item:has(input:checked) .cbt-opt-indicator{background:#93c5fd;border-color:#93c5fd;box-shadow:0 2px 8px #93c5fd59}.cbt-option-item.is-selected .cbt-opt-indicator .cbt-check-svg,.cbt-option-item:has(input:checked) .cbt-opt-indicator .cbt-check-svg{opacity:1;transform:scale(1)}.cbt-num-pad-wrapper{background:linear-gradient(145deg,#101626,#0a0f1c);border:1px solid rgba(56,189,248,.25);border-radius:var(--radius-lg);padding:22px 24px;max-width:360px;box-shadow:0 14px 36px #00000080,0 0 24px #38bdf814;user-select:none;margin-top:14px}.cbt-num-pad-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.cbt-num-pad-title{font-size:.76rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--text-secondary);display:flex;align-items:center;gap:6px}.cbt-num-pad-tag{font-size:.68rem;font-weight:700;color:#38bdf8;background:#38bdf81f;border:1px solid rgba(56,189,248,.3);padding:2px 7px;border-radius:4px;letter-spacing:.04em}.cbt-num-display-box{background:#060911;border:1.5px solid #1e293d;border-radius:10px;padding:12px 18px;margin-bottom:16px;display:flex;justify-content:space-between;align-items:center;box-shadow:inset 0 2px 6px #000000a6,0 1px 2px #ffffff08;transition:all .2s ease}.cbt-num-pad-wrapper:focus-within .cbt-num-display-box,.cbt-num-display-box:hover{border-color:#38bdf8;box-shadow:inset 0 2px 6px #000000a6,0 0 14px #38bdf838}.cbt-num-readout{font-family:var(--font-mono);font-size:1.85rem;font-weight:800;letter-spacing:.04em;color:#38bdf8;display:flex;align-items:center;overflow-x:auto;white-space:nowrap;text-shadow:0 0 14px rgba(56,189,248,.45);width:100%}.cbt-num-placeholder{color:#475569;font-size:1.25rem;font-weight:500;text-shadow:none}.cbt-num-cursor{display:inline-block;color:#38bdf8;font-weight:300;margin-left:2px;animation:cbt-blink 1.05s infinite steps(2,start)}@keyframes cbt-blink{0%,to{opacity:1}50%{opacity:0}}.cbt-keypad-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:12px}.cbt-key-btn{height:50px;border-radius:10px;background:linear-gradient(180deg,#1e293b,#131c2d);border:1px solid rgba(255,255,255,.1);color:#f1f5f9;font-family:var(--font-mono);font-size:1.3rem;font-weight:700;cursor:pointer;box-shadow:0 3px #080c14,0 4px 10px #00000059;transition:all .08s ease-in-out;display:flex;align-items:center;justify-content:center;user-select:none;touch-action:manipulation}.cbt-key-btn:hover{background:linear-gradient(180deg,#27364f,#1a273e);border-color:#38bdf873;color:#fff;transform:translateY(-1px);box-shadow:0 4px #080c14,0 6px 14px #0006}.cbt-key-btn:active,.cbt-key-btn.key-pressed{transform:translateY(3px)!important;box-shadow:0 0 #080c14,0 1px 3px #0006!important;background:#0f172a!important;border-color:#38bdf8!important;color:#38bdf8!important}.cbt-key-btn.cbt-key-accent{color:#38bdf8;font-weight:800}.cbt-keypad-actions{display:grid;grid-template-columns:1.25fr 1fr;gap:10px;margin-bottom:12px}.cbt-key-btn.cbt-key-backspace{font-size:.92rem;font-family:var(--font-sans);font-weight:700;color:#fbbf24;border-color:#fbbf2440;background:linear-gradient(180deg,#232225,#17161a)}.cbt-key-btn.cbt-key-backspace:hover{border-color:#fbbf24;background:linear-gradient(180deg,#2c2a2f,#1f1e24);color:#fef08a}.cbt-key-btn.cbt-key-clear{font-size:.92rem;font-family:var(--font-sans);font-weight:700;color:#f87171;border-color:#f8717140;background:linear-gradient(180deg,#261c20,#191215)}.cbt-key-btn.cbt-key-clear:hover{border-color:#f87171;background:linear-gradient(180deg,#322127,#22161b);color:#fca5a5}.cbt-num-hint-bar{font-size:.76rem;color:var(--text-muted);line-height:1.45;padding-top:8px;border-top:1px solid rgba(255,255,255,.06)}[data-theme=light] .cbt-num-pad-wrapper{background:linear-gradient(145deg,#fff,#f8fafc);border-color:#cbd5e1;box-shadow:0 12px 30px #00000014}[data-theme=light] .cbt-num-display-box{background:#f1f5f9;border-color:#cbd5e1;box-shadow:inset 0 2px 4px #00000014}[data-theme=light] .cbt-num-readout{color:#0284c7;text-shadow:none}[data-theme=light] .cbt-key-btn{background:linear-gradient(180deg,#f8fafc,#e2e8f0);border-color:#cbd5e1;color:#1e293b;box-shadow:0 3px #94a3b8,0 3px 6px #0000000f}[data-theme=light] .cbt-key-btn:hover{background:#eff6ff;border-color:#3b82f6;color:#1d4ed8}[data-theme=light] .cbt-key-btn:active,[data-theme=light] .cbt-key-btn.key-pressed{background:#dbeafe!important;border-color:#2563eb!important;color:#1d4ed8!important}.cbt-action-footer{display:flex;justify-content:space-between;align-items:center;padding:14px 24px;background:var(--cbt-footer-bg);border-top:1px solid var(--cbt-border)}.cbt-action-footer.cbt-no-palette-footer{justify-content:center}.cbt-action-footer.cbt-no-palette-footer .action-group-left{display:none!important}.cbt-action-footer.cbt-no-palette-footer .action-group-right{display:flex;justify-content:center;gap:12px}.action-group-left,.action-group-right{display:flex;gap:10px}.cbt-btn{padding:10px 18px;border-radius:var(--radius-md);font-weight:600;font-size:.9rem;cursor:pointer;border:1px solid transparent;transition:background var(--transition-fast)}.btn-default{background:var(--bg-surface-elevated);color:var(--text-primary);border-color:var(--border-strong)}.btn-default:hover{background:var(--border-subtle)}.btn-purple{background:#7e22ce;color:#fff}.btn-purple:hover{background:#6b21a8}.btn-blue-save{background:#2563eb;color:#fff;box-shadow:0 2px 8px #2563eb59}.btn-blue-save:hover{background:#1d4ed8}.cbt-sidebar{width:340px;display:flex;flex-direction:column;background:var(--cbt-sidebar-bg)}.sidebar-mobile-header{display:none;align-items:center;justify-content:space-between;padding:12px 18px;border-bottom:1px solid var(--cbt-border);background:var(--bg-surface-subtle);font-weight:700;font-size:.95rem;color:var(--text-primary)}.btn-close-drawer{background:transparent;border:none;color:var(--text-muted);font-size:1.5rem;line-height:1;cursor:pointer;padding:0 6px}.btn-close-drawer:hover{color:#ef4444}.cbt-palette-backdrop{position:fixed;inset:0;background:#000000a6;backdrop-filter:blur(2px);z-index:998;display:block}.cbt-palette-backdrop.hidden{display:none}.cbt-legend-box{padding:14px;border-bottom:1px solid var(--cbt-border);background:var(--bg-surface-subtle)}.legend-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.legend-item{display:flex;align-items:center;gap:8px;background:#141c2c;border:1px solid #233047;border-radius:8px;padding:6px 10px;font-size:.76rem;font-weight:600;color:#cbd5e1;min-height:36px;box-shadow:0 1px 3px #0003}.legend-item.span-2{grid-column:span 2}.pal-symbol{min-width:26px;height:22px;padding:0 6px;border-radius:4px;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-weight:700;font-size:.78rem;line-height:1;flex-shrink:0;user-select:none}.pal-symbol.answered{background:#10b981;color:#fff}.pal-symbol.not-answered{background:#f43f5e;color:#fff}.pal-symbol.marked{background:#f59e0b;color:#fff}.pal-symbol.answered-marked{background:#8b5cf6;color:#fff;position:relative}.pal-symbol.answered-marked:after{content:"";position:absolute;top:2px;right:2px;width:5px;height:5px;background:#10b981;border-radius:50%}.pal-symbol.not-visited{background:#27354a;border:1px solid #3b4d66;color:#cbd5e1}.cbt-palette-section{flex:1;display:flex;flex-direction:column;overflow:hidden;padding:14px}.palette-header-bar{display:flex;justify-content:space-between;align-items:center;font-family:var(--font-mono);font-weight:700;font-size:.82rem;letter-spacing:.05em;margin-bottom:12px;color:#f8fafc}.palette-title-wrap{display:flex;align-items:center;color:#f8fafc}.palette-grid-scroll{flex:1;overflow-y:auto;padding-right:4px}.palette-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.cbt-pal-btn{height:38px;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-weight:700;font-size:.86rem;border-radius:8px;border:1px solid transparent;cursor:pointer;user-select:none;transition:all .15s cubic-bezier(.4,0,.2,1)}.cbt-pal-btn:hover{transform:translateY(-1px);box-shadow:0 4px 12px #0006}.cbt-pal-btn.not-visited{background:#141c2c;border:1px solid #233047;color:#94a3b8}.cbt-pal-btn.not-visited:hover{background:#1c263a;border-color:#3b82f6;color:#f1f5f9}.cbt-pal-btn.not-answered{background:#f43f5e;border:1px solid #fb7185;color:#fff;box-shadow:0 2px 8px #f43f5e4d}.cbt-pal-btn.answered{background:#10b981;border:1px solid #34d399;color:#fff;box-shadow:0 2px 8px #10b9814d}.cbt-pal-btn.marked{background:#f59e0b;border:1px solid #fbbf24;color:#fff;box-shadow:0 2px 8px #f59e0b4d;border-radius:8px;width:100%;margin:0}.cbt-pal-btn.answered-marked{background:#8b5cf6;border:1px solid #a78bfa;color:#fff;box-shadow:0 2px 8px #8b5cf64d;border-radius:8px;width:100%;margin:0;position:relative}.cbt-pal-btn.answered-marked:after{content:"";position:absolute;top:3px;right:3px;width:6px;height:6px;background:#10b981;border-radius:50%;box-shadow:0 0 4px #10b981}.cbt-pal-btn.current{border:1px solid #60a5fa!important;box-shadow:0 0 0 2px #3b82f6,0 0 14px #3b82f699!important}.cbt-pal-btn.not-visited.current{background:#2563eb!important;border-color:#60a5fa!important;color:#fff!important}.cbt-submit-bar{padding:14px;border-top:1px solid var(--cbt-border);background:#0d131f;display:flex;flex-direction:column;gap:10px}.btn-cbt-submit{width:100%;padding:12px 16px;background:#10b981;color:#fff;font-weight:800;font-size:.88rem;letter-spacing:.04em;text-transform:uppercase;border:none;border-radius:8px;cursor:pointer;box-shadow:0 4px 14px #10b98159;transition:all var(--transition-fast);display:flex;align-items:center;justify-content:center}.btn-cbt-submit:hover{background:#059669;box-shadow:0 6px 18px #10b98173;transform:translateY(-1px)}highlight,.cbt-highlight,mark,hl{background:#10b9811f;border:1px solid rgba(16,185,129,.45);color:#34d399;padding:2px 7px;border-radius:6px;font-weight:700;letter-spacing:.2px;box-shadow:0 0 10px #10b98133;display:inline;font-family:inherit}highlight[color=cyan]{background:#06b6d41f;border-color:#06b6d473;color:#38bdf8;box-shadow:0 0 10px #06b6d433}highlight[color=amber]{background:#f59e0b1f;border-color:#f59e0b73;color:#fbbf24;box-shadow:0 0 10px #f59e0b33}highlight[color=red]{background:#ef44441f;border-color:#ef444473;color:#f87171;box-shadow:0 0 10px #ef444433}.cbt-passage-card,.preview-passage-box{background:var(--bg-surface-subtle);border:1px solid rgba(99,102,241,.35);border-left:4px solid #6366f1;border-radius:var(--radius-md);padding:14px 18px;margin-bottom:18px}.passage-header,.passage-box-header{font-weight:700;font-size:.92rem;color:#818cf8;margin-bottom:6px}.passage-content,.passage-box-text{font-size:.96rem;line-height:1.7;color:var(--text-secondary)}.cbt-matrix-container,.preview-matrix-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:16px;background:#0f172aa6;border:1px solid rgba(56,189,248,.25);border-radius:var(--radius-md);padding:16px 18px;margin:18px 0;box-shadow:0 6px 20px -4px #00000073}.cbt-matrix-col,.preview-matrix-col{background:#1e293b73;border:1px solid rgba(255,255,255,.08);border-radius:10px;padding:14px 16px;overflow-x:auto}.matrix-col-title,.preview-matrix-col strong{display:flex;align-items:center;gap:8px;font-size:.94rem;font-weight:700;color:#38bdf8;text-transform:uppercase;letter-spacing:.03em;margin-bottom:12px;border-bottom:1px solid rgba(56,189,248,.2);padding-bottom:8px}.cbt-matrix-col:nth-child(2) .matrix-col-title{color:#c084fc;border-bottom-color:#c084fc33}.matrix-row,.preview-matrix-col div{display:flex;align-items:flex-start;gap:12px;background:#0f172a66;border:1px solid rgba(255,255,255,.06);border-radius:8px;padding:10px 14px;margin-bottom:10px;font-size:.94rem;line-height:1.6;color:var(--text-primary);transition:all .15s ease}.matrix-row:hover{background:#1e293bb3;border-color:#38bdf84d}.matrix-row:last-child{margin-bottom:0}.matrix-item-badge{display:inline-flex;align-items:center;justify-content:center;min-width:28px;height:28px;padding:0 6px;border-radius:6px;background:#38bdf826;border:1px solid rgba(56,189,248,.4);color:#38bdf8;font-weight:700;font-size:.88rem;flex-shrink:0;margin-top:1px}.cbt-matrix-col:nth-child(2) .matrix-item-badge{background:#a855f726;border-color:#a855f766;color:#c084fc}.matrix-item-text{flex:1;overflow-x:auto;min-width:0}[data-theme=light] .cbt-matrix-container,[data-theme=light] .preview-matrix-grid{background:#f8fafc;border-color:#cbd5e1;box-shadow:0 4px 12px #0000000d}[data-theme=light] .cbt-matrix-col,[data-theme=light] .preview-matrix-col{background:#fff;border-color:#e2e8f0}[data-theme=light] .matrix-row{background:#f8fafc;border-color:#e2e8f0;color:#1e293b}[data-theme=light] .matrix-row:hover{background:#f1f5f9;border-color:#38bdf8}.cbt-checkbox-item input[type=checkbox]{width:18px;height:18px;cursor:pointer;accent-color:#8b5cf6}.smiles-canvas{display:inline-block;vertical-align:middle;background:#0f172a80;border:1px solid var(--border-strong);border-radius:var(--radius-md);margin:8px 0;max-width:100%;box-shadow:0 4px 12px #0003}[data-theme=light] .smiles-canvas{background:#f8fafc;border-color:#cbd5e1;box-shadow:0 2px 8px #0000000f}.cbt-svg-wrapper>svg{display:inline-block;max-width:100%;height:auto;vertical-align:middle;margin:10px auto;border-radius:var(--radius-md);background:#0f172a66;border:1px solid var(--border-subtle);padding:8px;box-shadow:0 4px 14px #00000026;shape-rendering:geometricPrecision;text-rendering:geometricPrecision;image-rendering:-webkit-optimize-contrast}.cbt-svg-wrapper>svg text{font-family:Inter,system-ui,-apple-system,sans-serif!important;font-weight:600!important;letter-spacing:.2px}[data-theme=light] .cbt-svg-wrapper>svg{background:#f8fafc;border-color:#cbd5e1;box-shadow:0 2px 8px #0000000f}.cbt-svg-grid-2col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:16px 0;width:100%}@media(max-width:640px){.cbt-svg-grid-2col{grid-template-columns:1fr}}.cbt-svg-card{background:var(--bg-surface-elevated, rgba(15, 23, 42, .6));border:1px solid var(--border-subtle, rgba(255, 255, 255, .1));border-radius:var(--radius-md, 10px);padding:14px;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 4px 14px #0003;overflow:hidden;transition:border-color var(--transition-fast, .2s)}.cbt-svg-card:hover{border-color:#38bdf859}.cbt-svg-card-header{width:100%;margin-bottom:10px;display:flex;justify-content:flex-start}.cbt-svg-badge{font-size:.76rem;font-weight:700;color:#38bdf8;background:#38bdf81f;border:1px solid rgba(56,189,248,.28);padding:3px 8px;border-radius:4px;text-transform:uppercase;letter-spacing:.04em}.cbt-svg-viewport{width:100%;display:flex;justify-content:center;align-items:center;overflow-x:auto}.cbt-svg-viewport>svg{max-width:100%;height:auto;display:block;shape-rendering:geometricPrecision;text-rendering:geometricPrecision}.cbt-svg-single-box{margin:16px auto;max-width:640px;background:var(--bg-surface-elevated, rgba(15, 23, 42, .6));border:1px solid var(--border-subtle, rgba(255, 255, 255, .1));border-radius:var(--radius-md, 10px);padding:16px;display:flex;justify-content:center;align-items:center;box-shadow:0 4px 14px #0003;overflow:hidden}.cbt-svg-single-box .cbt-svg-viewport{width:100%;display:flex;justify-content:center;align-items:center}.cbt-svg-single-box .cbt-svg-viewport>svg{max-width:100%;height:auto;display:block}.chem-fallback-inline{display:inline;background:transparent!important;border:none!important;padding:0!important;margin:0!important;color:inherit!important;box-shadow:none!important;font-weight:inherit}[data-theme=light] .chem-fallback-inline{background:transparent!important;border:none!important;color:inherit!important}[data-theme=light] .cbt-option-item{background:#fff;border-color:#cbd5e1}[data-theme=light] .cbt-option-item:hover{background:#f8fafc;border-color:#3b82f6}[data-theme=light] .cbt-opt-badge{background:#f1f5f9;border-color:#cbd5e1;color:#475569}[data-theme=light] .cbt-opt-indicator{background:#f1f5f9;border-color:#cbd5e1}[data-theme=light] .cbt-option-item.is-selected,[data-theme=light] .cbt-option-item:has(input:checked){background:#eff6ff;border-color:#3b82f6}[data-theme=light] .cbt-option-item.is-selected .cbt-opt-badge,[data-theme=light] .cbt-option-item:has(input:checked) .cbt-opt-badge{background:#3b82f6;border-color:#3b82f6;color:#fff}[data-theme=light] .cbt-option-item.is-selected .cbt-opt-indicator,[data-theme=light] .cbt-option-item:has(input:checked) .cbt-opt-indicator{background:#3b82f6;border-color:#3b82f6}[data-theme=light] .cbt-option-item.is-selected .cbt-opt-indicator .cbt-check-svg,[data-theme=light] .cbt-option-item:has(input:checked) .cbt-opt-indicator .cbt-check-svg{stroke:#fff}[data-theme=light] .cbt-legend-box{background:#f8fafc}[data-theme=light] .legend-item{background:#fff;border-color:#cbd5e1;color:#334155;box-shadow:0 1px 3px #0000000d}[data-theme=light] .pal-symbol.not-visited{background:#e2e8f0;border-color:#cbd5e1;color:#475569}[data-theme=light] .cbt-pal-btn.not-visited{background:#f1f5f9;border-color:#cbd5e1;color:#475569}[data-theme=light] .palette-sec-divider{color:#64748b;border-color:#e2e8f0}[data-theme=light] .cbt-submit-bar{background:#f8fafc}[data-theme=light] highlight,[data-theme=light] .cbt-highlight,[data-theme=light] mark,[data-theme=light] hl{background:#10b98126;border-color:#059669;color:#065f46;box-shadow:none}.mode-modal-box{max-width:620px;width:95%;background:#0b1222;border:1px solid rgba(56,189,248,.3);border-radius:16px;box-shadow:0 25px 60px #000000d9,0 0 35px #38bdf826;overflow:hidden;animation:cbtModalFadeIn .22s ease-out}@keyframes cbtModalFadeIn{0%{opacity:0;transform:scale(.96) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}.mode-step-container{padding:0}.mode-header-icon{font-size:1.3rem;display:inline-block}.mode-modal-subtitle{margin:0 0 18px;color:#94a3b8;font-size:.92rem;line-height:1.5}.mode-cards-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}@media(max-width:600px){.mode-cards-grid{grid-template-columns:1fr}}.mode-choice-card{position:relative;padding:22px 18px;border-radius:14px;cursor:pointer;background:linear-gradient(160deg,#0f172acc,#0a0f1ef2);border:1px solid rgba(255,255,255,.09);transition:all .25s cubic-bezier(.4,0,.2,1);display:flex;flex-direction:column}.mode-choice-card:hover{transform:translateY(-3px);border-color:#38bdf880;box-shadow:0 12px 30px #0009,0 0 20px #38bdf82e}.mode-card-badge{position:absolute;top:12px;right:12px;font-size:.65rem;font-weight:800;letter-spacing:.06em;padding:3px 8px;border-radius:6px;background:#94a3b826;color:#cbd5e1;border:1px solid rgba(148,163,184,.2)}.mode-card-badge.badge-glow{background:#38bdf826;color:#38bdf8;border-color:#38bdf859}.mode-card-icon{font-size:2rem;margin-bottom:12px}.mode-card-title{font-size:1.15rem;font-weight:700;color:#f8fafc;margin:0 0 8px}.mode-card-desc{font-size:.82rem;color:#94a3b8;line-height:1.45;margin:0 0 14px;flex:1}.mode-card-perks{list-style:none;padding:0;margin:0 0 16px;font-size:.78rem;color:#cbd5e1;display:flex;flex-direction:column;gap:6px}.mode-card-cta{font-size:.85rem;font-weight:700;color:#38bdf8;display:flex;align-items:center;gap:4px;transition:gap .2s ease}.mode-choice-card:hover .mode-card-cta{gap:8px;color:#7dd3fc}.btn-back-step{font-size:1.2rem;padding:2px 8px;border-radius:6px;cursor:pointer}.practice-options-box{display:flex;flex-direction:column;gap:14px}.practice-toggle-item{display:flex;justify-content:space-between;align-items:center;padding:16px 18px;border-radius:12px;background:#0f172a99;border:1px solid rgba(255,255,255,.08);cursor:pointer;transition:background .2s ease,border-color .2s ease}.practice-toggle-item:hover{background:#1e293bb3;border-color:#38bdf84d}.toggle-info{display:flex;flex-direction:column;gap:4px;padding-right:14px}.toggle-title{font-size:.95rem;font-weight:700;color:#f1f5f9}.toggle-desc{font-size:.8rem;color:#94a3b8;line-height:1.4}.cbt-toggle-switch{width:22px;height:22px;accent-color:#38bdf8;cursor:pointer}.practice-modal-footer{display:flex;justify-content:flex-end;gap:12px;padding:16px 24px;background:#0f172acc;border-top:1px solid 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#10b98138!important}.cbt-option-item.opt-correct .cbt-opt-indicator{background:#10b981!important;border-color:#10b981!important;color:#fff!important}.cbt-option-item.opt-incorrect{border-color:#f43f5e!important;background:#f43f5e1f!important;box-shadow:0 0 16px #f43f5e38!important}.cbt-option-item.opt-incorrect .cbt-opt-indicator{background:#f43f5e!important;border-color:#f43f5e!important;color:#fff!important}.cbt-option-item.opt-key-reveal{border:1.5px solid #10b981!important;background:#10b98114!important}.cbt-option-item.opt-key-reveal .cbt-opt-indicator{border-color:#10b981!important;color:#10b981!important}.cbt-num-display-box.num-correct{border-color:#10b981!important;box-shadow:0 0 20px #10b9814d!important}.cbt-num-display-box.num-incorrect{border-color:#f43f5e!important;box-shadow:0 0 20px #f43f5e4d!important}.cbt-solution-drawer{background:#0a0f1d;border:1px solid rgba(56,189,248,.35);border-radius:12px;padding:20px 22px;margin-top:24px;box-shadow:0 12px 30px #00000080,0 0 20px #38bdf814;animation:cbtSolutionUnfold .3s cubic-bezier(.16,1,.3,1)}@keyframes cbtSolutionUnfold{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.cbt-sol-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;padding-bottom:10px;border-bottom:1px solid rgba(255,255,255,.08)}.cbt-sol-title{font-size:calc(1.05rem * var(--cbt-font-scale, 1));font-weight:700;color:#38bdf8;display:flex;align-items:center;gap:8px}.cbt-sol-key-badge{font-size:calc(.85rem * var(--cbt-font-scale, 1));font-weight:700;padding:calc(3px * var(--cbt-font-scale, 1)) calc(10px * var(--cbt-font-scale, 1));border-radius:6px;background:#10b98126;border:1px solid rgba(16,185,129,.4);color:#34d399}.cbt-sol-content,.solution-content{font-size:calc(1.08rem * var(--cbt-font-scale, 1));line-height:calc(1.75 * var(--cbt-font-scale, 1));color:#e2e8f0}.cbt-sol-content p,.solution-content p,.cbt-sol-content li,.solution-content li,.cbt-sol-content blockquote,.solution-content blockquote{font-size:inherit;line-height:inherit}.cbt-pal-btn.p-correct{background:linear-gradient(135deg,#059669,#10b981)!important;color:#fff!important;border-color:#34d399!important;box-shadow:0 2px 8px #10b98166!important}.cbt-pal-btn.p-incorrect{background:linear-gradient(135deg,#e11d48,#f43f5e)!important;color:#fff!important;border-color:#fb7185!important;box-shadow:0 2px 8px #f43f5e66!important}.cbt-body.cbt-palette-hidden .cbt-sidebar,.cbt-body.cbt-palette-hidden .cbt-palette-resizer{display:none!important}.cbt-body.cbt-palette-hidden .cbt-main-area{flex:1 1 100%!important;max-width:100%!important}.cbt-body.cbt-practice-mode .cbt-font-resizer{display:none!important}.cbt-body.cbt-practice-mode .cbt-question-nav-strip{padding:8px 20px}.practice-summary-box{max-width:520px;width:92%;background:#0b1120;border:1px solid rgba(56,189,248,.35);border-radius:14px;overflow:hidden}.summary-hero-card{text-align:center;padding:8px 4px}.summary-hero-card h3{font-size:1.2rem;font-weight:700;color:#f8fafc;margin:0 0 18px}.summary-stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:18px}.summary-stat-pill{padding:16px 14px;border-radius:12px;background:#0f172ab3;border:1px solid rgba(255,255,255,.08);display:flex;flex-direction:column;gap:4px}.summary-stat-pill.stat-accent-green{border-color:#10b98159;background:#10b98114}.summary-stat-pill.stat-accent-red{border-color:#f43f5e59;background:#f43f5e14}.summary-stat-pill .stat-num{font-size:1.5rem;font-weight:800;color:#f8fafc}.summary-stat-pill.stat-accent-green .stat-num{color:#34d399}.summary-stat-pill.stat-accent-red .stat-num{color:#fb7185}.summary-stat-pill .stat-lbl{font-size:.78rem;color:#94a3b8;font-weight:600}.summary-timing-bar{display:flex;justify-content:space-around;padding:12px;border-radius:10px;background:#1e293b66;font-size:.85rem;color:#cbd5e1;font-weight:600}.badge-diff-easy{background:#10b98126!important;border:1px solid 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solid rgba(255,255,255,.1)}.exam-tier-title{font-size:1.4rem;font-weight:800;color:#f8fafc;margin:0;letter-spacing:-.02em}.exam-tier-badge{display:inline-block;font-size:.72rem;font-weight:800;padding:3px 8px;border-radius:6px;text-transform:uppercase;letter-spacing:.05em;margin-top:4px}.exam-tier-badge.badge-main{background:#38bdf833;color:#38bdf8;border:1px solid rgba(56,189,248,.4)}.exam-tier-badge.badge-adv{background:#a855f733;color:#c084fc;border:1px solid rgba(168,85,247,.4)}.exam-tier-desc{font-size:.9rem;color:#94a3b8;line-height:1.5;margin-bottom:20px}.exam-tier-footer{display:flex;justify-content:space-between;align-items:center;padding-top:16px;border-top:1px solid rgba(255,255,255,.08);font-size:.85rem;font-weight:700}.exam-tier-count{color:#38bdf8}.exam-tier-enter{color:#cbd5e1;display:flex;align-items:center;gap:4px}@keyframes cbtLockPulse{0%{transform:scale(1);box-shadow:0 0 #ef444466}50%{transform:scale(1.02);box-shadow:0 0 0 6px 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