:root{--bg-base: #0a0e17;--bg-surface: #111827;--bg-surface-elevated: #1e293b;--bg-surface-subtle: #0f172a;--border-subtle: #1f293d;--border-strong: #334155;--border-focus: #60a5fa;--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--primary-color: #3b82f6;--primary-hover: #2563eb;--primary-light: rgba(59, 130, 246, .15);--primary-text: #ffffff;--accent-color: #06b6d4;--accent-hover: #0891b2;--card-shadow: 0 2px 8px rgba(0, 0, 0, .35);--card-shadow-lg: 0 8px 20px rgba(0, 0, 0, .5);--cbt-header-bg: #0f172a;--cbt-body-bg: #111827;--cbt-sidebar-bg: #0c1220;--cbt-footer-bg: #0f172a;--cbt-question-bg: #111827;--cbt-border: #1e293b;--pal-not-visited-bg: #334155;--pal-not-visited-border: #475569;--pal-not-visited-text: #f8fafc;--pal-not-answered-bg: #dc2626;--pal-not-answered-text: #ffffff;--pal-answered-bg: #16a34a;--pal-answered-text: #ffffff;--pal-marked-bg: #9333ea;--pal-marked-text: #ffffff;--pal-dot-color: #22c55e;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", Consolas, Monaco, monospace;--transition-fast: .12s ease}*{box-sizing:border-box;margin:0;padding:0;-webkit-font-smoothing:antialiased}body{font-family:var(--font-sans);background-color:var(--bg-base);color:var(--text-primary);min-height:100vh;overflow-x:hidden;line-height:1.6}.hidden{display:none!important}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.katex{font-size:1.05em!important;text-rendering:geometricPrecision;white-space:normal}.katex-display{margin:.8em 0!important;overflow-x:auto;overflow-y:hidden;padding:4px 0}.katex .katex-html{white-space:normal}.dark-panel{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);box-shadow:var(--card-shadow)}.gradient-text{background:linear-gradient(135deg,#60a5fa,#a855f7,#06b6d4);-webkit-background-clip:text;-webkit-text-fill-color:transparent}h1,h2,h3,h4,h5,h6{font-weight:700;color:var(--text-primary);line-height:1.25}button,input,select,textarea{font-family:inherit}.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:#2563eb;color:#fff;border:none;padding:10px 20px;border-radius:var(--radius-md);font-size:.92rem;font-weight:600;cursor:pointer;box-shadow:0 2px 8px #2563eb4d;transition:background var(--transition-fast),transform var(--transition-fast)}.btn-primary:hover{background:#3b82f6;transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--bg-surface-elevated);color:var(--text-primary);border:1px solid var(--border-strong);padding:9px 16px;border-radius:var(--radius-md);font-size:.88rem;font-weight:500;cursor:pointer;transition:background var(--transition-fast),border-color var(--transition-fast)}.btn-secondary:hover{background:var(--border-subtle);border-color:var(--border-focus)}.btn-accent{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:#0891b2;color:#fff;border:none;padding:10px 20px;border-radius:var(--radius-md);font-size:.92rem;font-weight:600;cursor:pointer;box-shadow:0 2px 8px #0891b24d;transition:background var(--transition-fast),transform var(--transition-fast)}.btn-accent:hover{background:#06b6d4;transform:translateY(-1px)}.btn-ghost{background:transparent;color:var(--text-secondary);border:1px solid transparent;padding:8px 12px;border-radius:var(--radius-sm);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.btn-ghost:hover{color:var(--text-primary);background:var(--bg-surface-elevated);border-color:var(--border-subtle)}.btn-block{width:100%}.btn-large{padding:14px 28px;font-size:1.05rem}.badge-pill{display:inline-flex;align-items:center;padding:4px 10px;border-radius:12px;font-size:.75rem;font-weight:600;letter-spacing:.3px}.badge-blue{background:#3b82f62e;color:#60a5fa;border:1px solid rgba(59,130,246,.3)}.badge-red{background:#ef44442e;color:#f87171;border:1px solid rgba(239,68,68,.3)}.badge-green{background:#22c55e2e;color:#4ade80;border:1px solid rgba(34,197,94,.3)}.badge-purple{background:#a855f72e;color:#c084fc;border:1px solid rgba(168,85,247,.3)}.badge-dark{background:var(--bg-surface-elevated);color:var(--text-primary);border:1px solid var(--border-strong)}.badge-status{padding:4px 10px;border-radius:6px;font-size:.78rem;font-weight:600}.badge-valid{background:#22c55e33;color:#4ade80;border:1px solid rgba(34,197,94,.4)}.badge-invalid{background:#ef444433;color:#f87171;border:1px solid rgba(239,68,68,.4)}.global-navbar{display:flex;justify-content:space-between;align-items:center;padding:12px 28px;background:var(--bg-surface);border-bottom:1px solid var(--border-subtle);position:sticky;top:0;z-index:100}.nav-brand{display:flex;align-items:center;gap:12px}.brand-logo{width:38px;height:38px;background:linear-gradient(135deg,#3b82f6,#8b5cf6);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff}.brand-title{font-size:1.15rem;font-weight:800;letter-spacing:-.5px;color:var(--text-primary)}.brand-title span{color:var(--text-secondary);font-weight:500}.nav-controls{display:flex;align-items:center;gap:14px}.nav-user-panel{display:flex;align-items:center;gap:12px}.user-avatar-pill{display:flex;align-items:center;gap:8px;background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);padding:6px 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65px);position:relative}.login-wrapper{display:flex;align-items:center;justify-content:center;min-height:85vh;padding:20px}.login-card{width:100%;max-width:440px;padding:38px 32px;border-radius:var(--radius-xl)}.login-header{text-align:center;margin-bottom:28px}.shield-icon{width:64px;height:64px;margin:0 auto 16px;background:#3b82f61f;border:1px solid rgba(59,130,246,.3);border-radius:18px;display:flex;align-items:center;justify-content:center;color:var(--primary-color)}.login-header h2{font-size:1.5rem;margin-bottom:8px}.login-header p{color:var(--text-secondary);font-size:.9rem}.form-group{margin-bottom:20px}.form-group label{display:block;font-size:.85rem;font-weight:600;margin-bottom:8px;color:var(--text-secondary)}.input-with-icon{position:relative;display:flex;align-items:center}.input-with-icon svg{position:absolute;left:14px;color:var(--text-muted)}.input-with-icon input{width:100%;padding:12px 14px 12px 42px;background:var(--bg-surface-subtle);border:1px solid var(--border-strong);border-radius:var(--radius-md);color:var(--text-primary);font-size:.95rem;outline:none;transition:border-color var(--transition-fast)}.input-with-icon input:focus{border-color:var(--border-focus)}.alert-banner{display:flex;align-items:center;gap:10px;padding:12px 16px;border-radius:var(--radius-md);font-size:.88rem;margin-bottom:18px}.alert-error{background:#ef444426;border:1px solid rgba(239,68,68,.35);color:#f87171}.dashboard-layout{max-width:1280px;margin:28px auto;padding:0 24px 60px;display:flex;flex-direction:column;gap:26px}.dash-hero{padding:30px 36px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px}.hero-text h2{font-size:1.7rem;margin-bottom:6px}.hero-text p{color:var(--text-secondary);font-size:.95rem}.hero-actions{display:flex;gap:14px}.analytics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(480px,1fr));gap:24px}.chart-card{padding:22px 24px;display:flex;flex-direction:column}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.card-title{display:flex;align-items:center;gap:10px;font-size:1.05rem;font-weight:700}.chart-canvas-wrapper{position:relative;height:260px;width:100%}.history-card{padding:24px 28px}.table-responsive{overflow-x:auto;margin-top:10px}.custom-table{width:100%;border-collapse:separate;border-spacing:0;font-size:.92rem}.custom-table th{background:var(--bg-surface-elevated);color:var(--text-secondary);font-weight:600;padding:14px 16px;text-align:left;border-bottom:1px solid var(--border-strong)}.custom-table th:first-child{border-top-left-radius:var(--radius-sm)}.custom-table th:last-child{border-top-right-radius:var(--radius-sm)}.custom-table td{padding:14px 16px;border-bottom:1px solid var(--border-subtle);color:var(--text-primary)}.custom-table tr{content-visibility:auto;contain-intrinsic-size:0 48px}.custom-table tr:hover td{background:var(--bg-surface-subtle)}.empty-state{text-align:center;padding:40px 20px;color:var(--text-secondary)}.create-test-layout{max-width:1600px;margin:18px auto;padding:0 20px 40px;display:flex;flex-direction:column;gap:16px;height:calc(100vh - 90px)}.create-header{padding:16px 24px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}.title-meta{display:flex;align-items:center;gap:14px}.title-meta h2{font-size:1.25rem}.title-meta p{font-size:.85rem;color:var(--text-secondary)}.create-top-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.split-container{display:grid;grid-template-columns:1fr 1.15fr;gap:18px;flex:1;min-height:0}.pane-editor,.pane-preview{display:flex;flex-direction:column;overflow:hidden;height:100%}.pane-header{padding:12px 18px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border-subtle);background:var(--bg-surface-subtle)}.pane-title{display:flex;align-items:center;gap:8px}.editor-dot{width:10px;height:10px;border-radius:50%}.dot-red{background:#ef4444}.dot-yellow{background:#f59e0b}.dot-green{background:#10b981}.pane-label{font-weight:600;font-size:.88rem;margin-left:4px}.editor-area-wrapper{flex:1;position:relative;display:flex;overflow:hidden;background:var(--bg-base)}.editor-gutter{width:48px;background:#080c14;border-right:1px solid var(--border-strong);color:#475569;font-family:var(--font-mono);font-size:.85rem;line-height:1.6;padding:16px 6px 16px 0;text-align:right;user-select:none;overflow:hidden}.gutter-line{height:1.6em;padding-right:6px;transition:background .2s,color .2s}.gutter-line.error-line{background:#ef444459;color:#f87171;font-weight:700;border-right:3px solid #ef4444}#json-dump-input{flex:1;height:100%;background:transparent;color:#38bdf8;font-family:var(--font-mono);font-size:.85rem;line-height:1.6;padding:16px;border:none;outline:none;resize:none;tab-size:2;overflow-y:auto}.json-error-banner{background:#ef444426;border-top:1px solid rgba(239,68,68,.35);padding:12px 16px;max-height:120px;overflow-y:auto}.error-header{display:flex;align-items:center;gap:8px;color:#f87171;font-weight:600;font-size:.85rem;margin-bottom:4px}.error-line-badge{margin-left:auto;background:#ef4444;color:#fff;font-size:.75rem;font-weight:700}.error-details{color:#fca5a5;font-size:.8rem;font-family:var(--font-mono);white-space:pre-wrap}.preview-body{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:16px}.preview-empty-state{text-align:center;margin:auto;color:var(--text-muted)}.preview-q-card{background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:18px;content-visibility:auto;contain-intrinsic-size:0 140px}.preview-q-card:hover{border-color:var(--border-focus)}.preview-q-meta{display:flex;justify-content:space-between;margin-bottom:12px;font-size:.85rem;font-weight:600}.preview-q-text{font-size:1rem;line-height:1.7;margin-bottom:14px;color:var(--text-primary)}.preview-options-list{display:flex;flex-direction:column;gap:8px;margin-bottom:12px}.preview-opt-item{display:flex;align-items:center;gap:10px;padding:8px 12px;background:var(--bg-surface-subtle);border-radius:var(--radius-sm);border:1px solid var(--border-subtle);font-size:.92rem;line-height:1.5}.preview-opt-item.is-correct{background:#22c55e1f;border-color:#22c55e66;color:#4ade80;font-weight:600}.preview-ans-box{background:var(--bg-surface-subtle);border-left:3px solid #3b82f6;padding:10px 14px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:.9rem;line-height:1.6;margin-top:10px}.preview-ans-box strong{color:var(--primary-color)}.select-test-layout{max-width:1200px;margin:32px auto;padding:0 24px 60px}.select-header-bar{padding:20px 28px;display:flex;justify-content:space-between;align-items:center;border-radius:var(--radius-lg);background:var(--bg-surface);border:1px solid var(--border-subtle);gap:20px;flex-wrap:wrap}.select-header-bar .title-meta{display:flex;align-items:center;gap:16px}.select-header-bar .title-meta h2{font-size:1.35rem;font-weight:700;margin-bottom:3px}.select-header-bar .title-meta p{font-size:.88rem;color:var(--text-secondary);margin:0}.select-header-actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.tests-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(360px,1fr));gap:24px;margin-top:28px}.test-card{padding:24px 26px;display:flex;flex-direction:column;justify-content:space-between;border-radius:var(--radius-lg);background:var(--bg-surface);border:1px solid var(--border-subtle);box-shadow:var(--card-shadow);content-visibility:auto;contain-intrinsic-size:0 200px;transition:transform var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast)}.test-card:hover{transform:translateY(-3px);border-color:var(--border-focus);box-shadow:0 8px 24px #00000073}.test-card-top{margin-bottom:22px}.test-card-subject{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.test-card-name{font-size:1.15rem;font-weight:700;line-height:1.45;margin-bottom:12px;color:var(--text-primary)}.test-card-info{font-size:.88rem;color:var(--text-secondary);display:flex;align-items:center;gap:14px;padding-top:4px}.test-card-actions{display:flex;gap:10px;align-items:center;padding-top:14px;border-top:1px solid var(--border-subtle)}.test-card-actions .btn-start-test{flex:1.6;padding:10px 16px;font-size:.92rem;font-weight:600}.test-card-actions .btn-export-json{flex:1.2;padding:10px 12px;font-size:.85rem;white-space:nowrap}.test-card-actions .btn-delete-test{padding:10px 14px;color:#ef4444;border:1px solid rgba(239,68,68,.25);background:#ef444414;border-radius:var(--radius-md);transition:all var(--transition-fast)}.test-card-actions .btn-delete-test:hover{background:#ef444433;border-color:#ef4444;color:#fff}#view-test{height:100vh;min-height:100vh;overflow:hidden}.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}.exam-logo-box{background:#fff;color:#1e3a8a;font-weight:900;padding:5px 12px;border-radius:4px;font-size:.95rem;letter-spacing:.5px}.exam-title-box h3{font-size:1.05rem;color:#fff;margin-bottom:2px}.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-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-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)}.q-meta{display:flex;align-items:center;gap:12px}.q-number-pill{background:var(--primary-color);color:#fff;padding:4px 12px;border-radius:4px;font-weight:700;font-size:.9rem}.q-type-pill{font-weight:600;color:var(--text-secondary);font-size:.9rem}.q-marks-scheme{display:flex;gap:8px;font-weight:700;font-size:.85rem}.mark-pos{color:#22c55e}.mark-neg{color:#ef4444}.cbt-question-scroll{flex:1;overflow-y:auto;padding:28px}.question-stem{font-size:1.15rem;line-height:1.8;margin-bottom:28px;color:var(--text-primary)}.options-wrapper{display:flex;flex-direction:column;gap:14px}.cbt-option-item{display:flex;align-items:center;gap:14px;padding:12px 18px;background:var(--bg-surface-elevated);border:1px solid var(--border-strong);border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition-fast),border-color var(--transition-fast)}.cbt-option-item:hover{border-color:var(--border-focus);background:var(--bg-surface-subtle)}.cbt-option-item input[type=radio]{width:18px;height:18px;cursor:pointer;accent-color:var(--primary-color)}.cbt-option-label{cursor:pointer;font-size:1.02rem;line-height:1.6;flex:1;color:var(--text-primary)}.cbt-num-input-wrapper{background:var(--bg-surface-elevated);padding:20px;border-radius:var(--radius-md);border:1px solid var(--border-strong);max-width:440px}.cbt-num-input-wrapper label{display:block;font-weight:600;margin-bottom:10px;font-size:.95rem}.cbt-num-input{width:100%;padding:12px 16px;font-size:1.2rem;font-family:var(--font-mono);background:var(--bg-surface-subtle);border:2px solid var(--border-strong);border-radius:var(--radius-sm);color:var(--text-primary);outline:none}.cbt-num-input:focus{border-color:var(--border-focus)}.num-hint{margin-top:8px;font-size:.8rem;color:var(--text-muted)}.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)}.action-group-left,.action-group-right{display:flex;gap:10px}.cbt-btn{padding:10px 18px;border-radius:4px;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)}.cbt-candidate-info{padding:12px 18px;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--cbt-border);background:var(--bg-surface-subtle)}.candidate-photo{width:44px;height:44px;background:var(--bg-surface-elevated);border-radius:8px;border:1px solid var(--border-strong);display:flex;align-items:center;justify-content:center;color:var(--text-secondary)}.candidate-meta{display:flex;flex-direction:column}.meta-label{font-size:.75rem;color:var(--text-muted)}.candidate-name{font-weight:700;font-size:.95rem;color:var(--text-primary)}.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 12px;font-size:.78rem;color:var(--text-secondary)}.legend-item{display:flex;align-items:center;gap:8px}.legend-item.span-2{grid-column:span 2}.pal-symbol{width:26px;height:22px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.8rem;flex-shrink:0}.pal-symbol.not-visited{background:var(--pal-not-visited-bg);border:1px solid var(--pal-not-visited-border);color:var(--pal-not-visited-text);border-radius:4px}.pal-symbol.not-answered{background:var(--pal-not-answered-bg);color:var(--pal-not-answered-text);clip-path:polygon(50% 0%,100% 25%,100% 100%,0% 100%,0% 25%)}.pal-symbol.answered{background:var(--pal-answered-bg);color:var(--pal-answered-text);clip-path:polygon(50% 100%,100% 75%,100% 0%,0% 0%,0% 75%)}.pal-symbol.marked{background:var(--pal-marked-bg);color:var(--pal-marked-text);border-radius:50%;width:22px;height:22px}.pal-symbol.answered-marked{background:var(--pal-marked-bg);color:var(--pal-marked-text);border-radius:50%;width:22px;height:22px;position:relative}.pal-symbol.answered-marked:after{content:"";position:absolute;bottom:0;right:0;width:7px;height:7px;background:var(--pal-dot-color);border-radius:50%;border:1px solid #ffffff}.cbt-palette-section{flex:1;display:flex;flex-direction:column;overflow:hidden;padding:14px}.palette-header-bar{display:flex;justify-content:space-between;font-weight:700;font-size:.88rem;margin-bottom:12px;color:var(--text-primary)}.palette-summary{font-size:.78rem;color:var(--text-muted)}.palette-grid-scroll{flex:1;overflow-y:auto;padding-right:4px}.palette-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.cbt-pal-btn{height:42px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.92rem;cursor:pointer;user-select:none;transition:transform var(--transition-fast)}.cbt-pal-btn:hover{transform:scale(1.06)}.cbt-pal-btn.current{box-shadow:0 0 0 3px #38bdf8!important}.cbt-pal-btn.not-visited{background:var(--pal-not-visited-bg);border:1px solid var(--pal-not-visited-border);color:var(--pal-not-visited-text);border-radius:4px}.cbt-pal-btn.not-answered{background:var(--pal-not-answered-bg);color:var(--pal-not-answered-text);clip-path:polygon(50% 0%,100% 25%,100% 100%,0% 100%,0% 25%)}.cbt-pal-btn.answered{background:var(--pal-answered-bg);color:var(--pal-answered-text);clip-path:polygon(50% 100%,100% 75%,100% 0%,0% 0%,0% 75%)}.cbt-pal-btn.marked{background:var(--pal-marked-bg);color:var(--pal-marked-text);border-radius:50%;width:42px;margin:0 auto}.cbt-pal-btn.answered-marked{background:var(--pal-marked-bg);color:var(--pal-marked-text);border-radius:50%;width:42px;margin:0 auto;position:relative}.cbt-pal-btn.answered-marked:after{content:"";position:absolute;bottom:2px;right:2px;width:10px;height:10px;background:var(--pal-dot-color);border-radius:50%;border:1.5px solid #ffffff}.cbt-submit-bar{padding:14px;border-top:1px solid var(--cbt-border);background:var(--bg-surface-subtle)}.btn-cbt-submit{width:100%;padding:12px;background:#16a34a;color:#fff;font-weight:700;font-size:1rem;border:none;border-radius:var(--radius-sm);cursor:pointer;box-shadow:0 2px 8px #16a34a59;transition:background var(--transition-fast)}.btn-cbt-submit:hover{background:#22c55e}.header-bar{padding:20px 28px;display:flex;justify-content:space-between;align-items:center;border-radius:var(--radius-lg);background:var(--bg-surface);border:1px solid var(--border-subtle);gap:20px;flex-wrap:wrap}.header-bar .title-meta{display:flex;align-items:center;gap:16px}.header-bar .title-meta h2{font-size:1.35rem;font-weight:700;margin-bottom:3px}.header-bar .title-meta p{font-size:.88rem;color:var(--text-secondary);margin:0}.results-layout{max-width:1000px;margin:28px auto;padding:0 20px 60px;display:flex;flex-direction:column;gap:22px}.results-score-hero{display:grid;grid-template-columns:repeat(3,1fr);padding:32px;text-align:center;gap:20px}.stat-subtitle{font-size:.85rem;text-transform:uppercase;letter-spacing:.8px;color:var(--text-muted);display:block;margin-bottom:6px}.stat-main-number{font-size:3rem;font-weight:800;line-height:1.1;margin-bottom:4px}.stat-time-number{font-size:2.4rem;font-weight:800;line-height:1.2;color:#38bdf8;margin-bottom:4px}.stat-caption{font-size:.85rem;color:var(--text-secondary)}.metrics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px}.metric-card{padding:20px 18px;display:flex;align-items:center;gap:14px}.metric-icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:700;flex-shrink:0}.green-icon{background:#22c55e26;color:#22c55e}.red-icon{background:#ef444426;color:#ef4444}.gray-icon{background:#94a3b826;color:#94a3b8}.purple-icon{background:#a855f726;color:#a855f7}.cyan-icon{background:#06b6d426;color:#06b6d4}.metric-info{display:flex;flex-direction:column}.metric-title{font-size:.78rem;color:var(--text-secondary);font-weight:600}.metric-info h3{font-size:1.45rem}.text-green{color:#22c55e}.text-red{color:#ef4444}.export-banner{display:flex;justify-content:space-between;align-items:center;padding:24px 30px;flex-wrap:wrap;gap:20px;border-color:#06b6d44d}.export-text h3{font-size:1.15rem;margin-bottom:4px}.export-text p{font-size:.88rem;color:var(--text-secondary)}.hidden-pdf{position:absolute;left:-9999px;top:-9999px;width:750px;background:#fff!important;color:#0f172a!important;padding:24px;font-family:Arial,sans-serif;line-height:1.6}.hidden-pdf *{color:#0f172a}.pdf-header{border-bottom:2px solid #2563eb;padding-bottom:14px;margin-bottom:24px}.pdf-header h1{color:#1e40af!important}.pdf-header h2{color:#334155!important}.pdf-q-block{margin-bottom:20px;padding:16px 20px;background:#f8fafc;border:1px solid #cbd5e1;border-radius:8px;page-break-inside:avoid!important;break-inside:avoid!important}.pdf-q-title{font-weight:700;font-size:1.05em;margin-bottom:12px;color:#0f172a!important;line-height:1.6}.pdf-answers{margin:12px 0;font-size:.95em}.pdf-ans-wrong{color:#dc2626!important;font-weight:700}.pdf-ans-correct{color:#16a34a!important;font-weight:700}.pdf-explanation{background:#eff6ff!important;border-left:4px solid #2563eb!important;padding:12px 16px;border-radius:4px;margin-top:10px;font-size:.95em;color:#1e3a8a!important;line-height:1.7;page-break-inside:avoid!important;break-inside:avoid!important}.pdf-explanation *{color:#1e3a8a!important}.pdf-time-tag{font-size:.82em;color:#64748b!important;margin-top:8px}@media(max-width:1024px){.split-container{grid-template-columns:1fr;height:auto}.create-test-layout{height:auto}.pane-editor{height:400px}.pane-preview{height:500px}.analytics-grid{grid-template-columns:1fr}.results-score-hero{grid-template-columns:1fr;gap:16px}}@media(max-width:768px){.select-test-layout{padding:0 16px 40px;margin:16px auto}.select-header-bar{padding:16px;flex-direction:column;align-items:stretch;gap:14px}.select-header-actions{flex-direction:column;width:100%}.select-header-actions button{width:100%;min-height:48px;font-size:.95rem;justify-content:center}.tests-grid{grid-template-columns:1fr;gap:16px;margin-top:18px}.test-card{padding:18px}.test-card-actions{flex-direction:column;align-items:stretch;gap:10px}.test-card-actions .btn-start-test,.test-card-actions .btn-export-json,.test-card-actions .btn-delete-test{width:100%;min-height:46px;font-size:.95rem;justify-content:center}.test-card-actions .btn-delete-test{border-color:#ef444466}.global-navbar{padding:0 16px}.exam-countdown-pill{display:none}.hero-actions{flex-direction:column;width:100%}.hero-actions button{width:100%;min-height:48px}.cbt-header{padding:8px 12px;flex-wrap:wrap;gap:8px}.cbt-branding{gap:8px}.exam-logo-box{font-size:.8rem;padding:4px 8px}.exam-title-box h3{font-size:.88rem;max-width:160px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.cbt-timer-box{padding:4px 10px}.timer-digits{font-size:1.1rem}.cbt-body{flex-direction:column;overflow-y:auto}.cbt-main-area{border-right:none;border-bottom:2px solid var(--cbt-border)}.cbt-question-scroll{padding:16px}.question-stem{font-size:1.02rem;line-height:1.6;margin-bottom:20px}.cbt-action-footer{padding:12px;flex-direction:column;gap:10px;background:var(--bg-surface)}.action-group-left,.action-group-right{width:100%;display:grid;grid-template-columns:1fr 1fr;gap:8px}.cbt-btn{width:100%;padding:12px 8px;font-size:.82rem;text-align:center;justify-content:center;min-height:44px;white-space:normal;line-height:1.2}.cbt-sidebar{width:100%;max-width:100%;border-left:none}}.btn-ai-prompt{background:#a855f726;border-color:#a855f766;color:#c084fc}.btn-ai-prompt:hover{background:#a855f740;border-color:#c084fc;color:#fff}.modal-backdrop{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#000000bf;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.modal-box{width:100%;max-width:720px;max-height:85vh;display:flex;flex-direction:column;box-shadow:0 20px 40px #000c;border-color:#a855f766}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--border-subtle)}.modal-title{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.1rem;color:#c084fc}.prompt-tab-bar{display:flex;background:var(--bg-surface-subtle);border-bottom:1px solid var(--border-subtle);padding:0 16px;gap:8px}.prompt-tab-btn{background:transparent;border:none;color:var(--text-secondary);padding:12px 18px;font-size:.92rem;font-weight:600;cursor:pointer;border-bottom:2px solid transparent;transition:all var(--transition-fast)}.prompt-tab-btn:hover{color:var(--text-primary)}.prompt-tab-btn.active{color:#c084fc;border-bottom-color:#c084fc;background:#a855f714}.modal-body{padding:20px;display:flex;flex-direction:column;gap:12px;overflow-y:auto}.modal-desc{font-size:.9rem;color:var(--text-secondary);line-height:1.5}.prompt-text-container{height:280px;border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--border-strong)}#ai-prompt-textarea{width:100%;height:100%;background:var(--bg-base);color:#38bdf8;font-family:var(--font-mono);font-size:.85rem;line-height:1.5;padding:14px;border:none;outline:none;resize:none}.modal-footer{display:flex;justify-content:flex-end;align-items:center;gap:16px;padding:16px 20px;border-top:1px solid var(--border-subtle);background:var(--bg-surface-subtle)}.copy-success-msg{color:#4ade80;font-weight:600;font-size:.88rem}.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:1fr 1fr;gap:16px;background:var(--bg-surface-subtle);border:1px solid var(--border-strong);border-radius:var(--radius-md);padding:14px 18px;margin:16px 0}.matrix-col-title,.preview-matrix-col strong{display:block;font-size:.92rem;font-weight:700;color:#38bdf8;margin-bottom:8px;border-bottom:1px solid var(--border-subtle);padding-bottom:4px}.matrix-row,.preview-matrix-col div{font-size:.92rem;line-height:1.6;color:var(--text-primary);margin-bottom:4px}.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}.smiles-container{display:inline-flex;flex-wrap:wrap;align-items:center;gap:8px}.cbt-svg-diagram,.cbt-svg-wrapper svg,.question-main-statement svg,.cbt-option-label svg{display:inline-block;max-width:100%;height:auto;vertical-align:middle;margin:8px 0;border-radius:var(--radius-md);background:#0f172a99;border:1px solid var(--border-strong);padding:6px;box-shadow:0 4px 12px #0003}[data-theme=light] .cbt-svg-diagram,[data-theme=light] .cbt-svg-wrapper svg,[data-theme=light] .question-main-statement svg,[data-theme=light] .cbt-option-label svg{background:#f8fafc;border-color:#cbd5e1;box-shadow:0 2px 8px #0000000f}.chem-fallback-badge{display:inline-flex;align-items:center;padding:6px 14px;background:#1e293bcc;border:1.5px solid var(--accent-primary);border-radius:var(--radius-md);color:var(--accent-primary);font-size:14px;font-weight:600;margin:6px 4px;box-shadow:0 0 10px #38bdf826}[data-theme=light] .chem-fallback-badge{background:#f0fdf4;border-color:#16a34a;color:#15803d}