:root{--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", monospace;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--radius-full: 9999px;--transition-fast: .15s ease;--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .05);--shadow-md: 0 8px 24px rgba(0, 0, 0, .08);--shadow-lg: 0 16px 40px rgba(0, 0, 0, .12);--bg-app: #f4f6fa;--bg-card: #ffffff;--bg-card-hover: #f9fafb;--bg-glass: rgba(255, 255, 255, .7);--border-color: #e5e8eb;--border-hover: #d2d6dc;--text-primary: #111827;--text-secondary: #4b5563;--text-tertiary: #9ca3af;--primary: #2563eb;--primary-hover: #1d4ed8;--primary-light: #eff6ff;--success: #10b981;--success-light: #ecfdf5;--danger: #ef4444;--danger-light: #fef2f2;--warning: #f59e0b;--warning-light: #fffbeb;--accent: #8b5cf6;--accent-light: #f5f3ff}[data-theme=dark]{--bg-app: #0b0f19;--bg-card: #151d30;--bg-card-hover: #1c263f;--bg-glass: rgba(21, 29, 48, .7);--border-color: #24304d;--border-hover: #31426a;--text-primary: #f9fafb;--text-secondary: #9ca3af;--text-tertiary: #6b7280;--primary: #3b82f6;--primary-hover: #60a5fa;--primary-light: rgba(59, 130, 246, .1);--success: #34d399;--success-light: rgba(52, 211, 153, .1);--danger: #f87171;--danger-light: rgba(248, 113, 113, .1);--warning: #fbbf24;--warning-light: rgba(251, 191, 36, .1);--accent: #a78bfa;--accent-light: rgba(167, 139, 250, .1);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .2);--shadow-md: 0 8px 24px rgba(0, 0, 0, .3);--shadow-lg: 0 16px 40px rgba(0, 0, 0, .4)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-app);color:var(--text-primary);line-height:1.5;transition:background-color var(--transition-normal),color var(--transition-normal);overflow-x:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}@keyframes pulseLowTime{0%,to{transform:scale(1);box-shadow:0 0 #ef444400}50%{transform:scale(1.05);box-shadow:0 0 12px #ef44444d}}.anim-fade{animation:fadeIn var(--transition-normal) forwards}.anim-slide{animation:slideIn var(--transition-normal) forwards}.app-container{min-height:100vh;display:flex;flex-direction:column;max-width:1200px;margin:0 auto;padding:20px}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px;padding-bottom:15px;border-bottom:1px solid var(--border-color)}.logo-section{display:flex;align-items:center;gap:12px}.logo-section h1{font-size:1.5rem;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.logo-badge{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;padding:4px 10px;border-radius:var(--radius-sm);font-size:.75rem;font-weight:700;letter-spacing:.05em}.card{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:30px;box-shadow:var(--shadow-md);transition:transform var(--transition-normal),border-color var(--transition-normal),box-shadow var(--transition-normal)}.card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-lg)}.glass-panel{background-color:var(--bg-glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-md)}.title-large{font-size:2.25rem;font-weight:800;letter-spacing:-.02em;margin-bottom:10px;color:var(--text-primary)}.text-lead{font-size:1.125rem;color:var(--text-secondary);margin-bottom:25px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--font-sans);font-size:.95rem;font-weight:600;padding:12px 24px;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all var(--transition-fast);text-decoration:none}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:var(--primary-hover);transform:translateY(-1px);box-shadow:0 4px 12px #2563eb33}.btn-primary:active{transform:translateY(0)}.btn-secondary{background-color:var(--bg-card);color:var(--text-primary);border-color:var(--border-color)}.btn-secondary:hover{background-color:var(--bg-card-hover);border-color:var(--border-hover)}.btn-accent{background-color:var(--accent);color:#fff}.btn-accent:hover{background-color:#7c3aed;transform:translateY(-1px);box-shadow:0 4px 12px #8b5cf633}.btn-danger{background-color:var(--danger);color:#fff}.btn-danger:hover{background-color:#dc2626}.btn-icon-only{padding:12px;border-radius:var(--radius-md)}.theme-toggle{background:none;border:1px solid var(--border-color);padding:8px;border-radius:var(--radius-md);cursor:pointer;color:var(--text-secondary);transition:all var(--transition-fast)}.theme-toggle:hover{color:var(--text-primary);border-color:var(--border-hover);background-color:var(--bg-card-hover)}.progress-bar-container{width:100%;height:8px;background-color:var(--border-color);border-radius:var(--radius-full);overflow:hidden;margin-bottom:25px}.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:var(--radius-full);transition:width .3s cubic-bezier(.4,0,.2,1)}.config-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:25px}@media (max-width: 768px){.config-grid{grid-template-columns:1fr}}.form-group{display:flex;flex-direction:column;gap:8px}.form-group label{font-size:.875rem;font-weight:600;color:var(--text-secondary)}.form-control{font-family:var(--font-sans);font-size:1rem;padding:12px;border-radius:var(--radius-md);border:1px solid var(--border-color);background-color:var(--bg-card);color:var(--text-primary);outline:none;transition:border-color var(--transition-fast)}.form-control:focus{border-color:var(--primary)}.mode-selector{display:flex;gap:15px}.mode-option{flex:1;display:flex;flex-direction:column;gap:6px;padding:16px;border:2px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);background-color:var(--bg-card)}.mode-option.active{border-color:var(--primary);background-color:var(--primary-light)}.mode-title{font-weight:700;font-size:1rem;color:var(--text-primary)}.mode-description{font-size:.8rem;color:var(--text-secondary);line-height:1.4}.quiz-layout{display:grid;grid-template-columns:1fr 300px;gap:30px;align-items:start}@media (max-width: 992px){.quiz-layout{grid-template-columns:1fr}}.quiz-main{display:flex;flex-direction:column;gap:20px}.quiz-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.quiz-question-number{font-weight:700;font-size:1.125rem;color:var(--text-secondary)}.quiz-timer{display:flex;align-items:center;gap:8px;padding:8px 16px;border-radius:var(--radius-full);font-family:var(--font-mono);font-weight:600;background-color:var(--bg-card);border:1px solid var(--border-color)}.quiz-timer.low-time{background-color:var(--danger-light);border-color:var(--danger);color:var(--danger);animation:pulseLowTime 1.5s infinite}.question-box{margin-bottom:25px}.question-text{font-size:1.15rem;font-weight:600;line-height:1.6;color:var(--text-primary);margin-bottom:20px}.options-list{display:flex;flex-direction:column;gap:12px}.option-item{display:flex;align-items:flex-start;gap:15px;padding:16px 20px;border-radius:var(--radius-md);border:1px solid var(--border-color);background-color:var(--bg-card);cursor:pointer;transition:all var(--transition-fast)}.option-item:hover{border-color:var(--border-hover);background-color:var(--bg-card-hover)}.option-item.selected{border-color:var(--primary);background-color:var(--primary-light)}.option-letter{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:var(--radius-sm);background-color:var(--border-color);color:var(--text-secondary);font-weight:700;font-size:.875rem;flex-shrink:0;transition:all var(--transition-fast)}.option-item.selected .option-letter{background-color:var(--primary);color:#fff}.option-text{font-size:.975rem;color:var(--text-primary);padding-top:2px}.multi-select-hint{font-size:.85rem;font-weight:600;color:var(--accent);margin-bottom:15px;background-color:var(--accent-light);padding:6px 12px;border-radius:var(--radius-sm);display:inline-block}.feedback-panel{margin-top:25px;padding:24px;border-radius:var(--radius-md);border-left:5px solid;animation:fadeIn var(--transition-normal) forwards}.feedback-panel.correct{background-color:var(--success-light);border-left-color:var(--success)}.feedback-panel.incorrect{background-color:var(--danger-light);border-left-color:var(--danger)}.feedback-title{font-weight:700;font-size:1.1rem;margin-bottom:10px;display:flex;align-items:center;gap:8px}.feedback-panel.correct .feedback-title{color:var(--success)}.feedback-panel.incorrect .feedback-title{color:var(--danger)}.feedback-explanation{font-size:.95rem;color:var(--text-secondary);line-height:1.6}.feedback-explanation code{font-family:var(--font-mono);font-size:.85rem;background-color:#0000000d;padding:2px 4px;border-radius:4px}[data-theme=dark] .feedback-explanation code{background-color:#ffffff1a}.quiz-actions{display:flex;justify-content:space-between;align-items:center;margin-top:20px;padding-top:20px;border-top:1px solid var(--border-color);gap:15px}.quiz-actions-right{display:flex;gap:10px}.sidebar-panel{display:flex;flex-direction:column;gap:20px}.sidebar-title{font-size:1rem;font-weight:700;color:var(--text-primary)}.question-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(36px,1fr));gap:8px;max-height:350px;overflow-y:auto;padding-right:5px}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-hover);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}.grid-cell{aspect-ratio:1;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700;border-radius:var(--radius-sm);border:1px solid var(--border-color);background-color:var(--bg-card);cursor:pointer;transition:all var(--transition-fast)}.grid-cell:hover{border-color:var(--text-secondary)}.grid-cell.current{border-color:var(--primary);background-color:var(--primary-light);color:var(--primary);box-shadow:0 0 0 2px var(--primary)}.grid-cell.answered{background-color:var(--text-tertiary);color:#fff;border-color:var(--text-tertiary)}.grid-cell.flagged{border-color:var(--warning);color:var(--warning);background-color:var(--warning-light)}.grid-cell.correct-ans{background-color:var(--success);color:#fff;border-color:var(--success)}.grid-cell.incorrect-ans{background-color:var(--danger);color:#fff;border-color:var(--danger)}.results-header{text-align:center;margin-bottom:40px}.score-radial{position:relative;width:160px;height:160px;margin:0 auto 20px;display:flex;align-items:center;justify-content:center}.score-svg{transform:rotate(-90deg);width:100%;height:100%}.score-circle-bg{fill:none;stroke:var(--border-color);stroke-width:10}.score-circle-fill{fill:none;stroke:url(#score-gradient);stroke-width:10;stroke-linecap:round;transition:stroke-dashoffset .8s ease-out}.score-value{position:absolute;font-size:2.25rem;font-weight:800;color:var(--text-primary);display:flex;flex-direction:column;align-items:center;line-height:1}.score-label{font-size:.75rem;font-weight:600;color:var(--text-secondary);margin-top:4px}.badge-status{display:inline-block;padding:6px 16px;border-radius:var(--radius-full);font-weight:700;font-size:.9rem;margin-top:10px;text-transform:uppercase;letter-spacing:.05em}.badge-status.pass{background-color:var(--success-light);color:var(--success);border:1px solid var(--success)}.badge-status.fail{background-color:var(--danger-light);color:var(--danger);border:1px solid var(--danger)}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin-bottom:30px}@media (max-width: 768px){.stats-grid{grid-template-columns:repeat(2,1fr)}}.stat-card{background-color:var(--bg-app);border:1px solid var(--border-color);padding:15px;border-radius:var(--radius-md);text-align:center}.stat-val{font-size:1.5rem;font-weight:800;color:var(--text-primary)}.stat-lbl{font-size:.75rem;color:var(--text-secondary);font-weight:600}.review-filters{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap}.filter-btn{font-family:var(--font-sans);font-size:.85rem;font-weight:600;padding:6px 14px;border-radius:var(--radius-full);border:1px solid var(--border-color);background-color:var(--bg-card);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast)}.filter-btn:hover{background-color:var(--bg-card-hover);color:var(--text-primary)}.filter-btn.active{background-color:var(--primary);color:#fff;border-color:var(--primary)}.review-item{border:1px solid var(--border-color);border-radius:var(--radius-md);margin-bottom:15px;background-color:var(--bg-card);overflow:hidden}.review-item-header{padding:15px 20px;background-color:var(--bg-card-hover);border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center;cursor:pointer}.review-item-title{font-weight:700;font-size:.95rem;display:flex;align-items:center;gap:10px}.review-item-body{padding:20px;display:flex;flex-direction:column;gap:15px;border-top:1px solid var(--border-color);background-color:var(--bg-card)}.review-option{padding:12px 16px;border-radius:var(--radius-sm);border:1px solid var(--border-color);font-size:.9rem}.review-option.correct-choice{border-color:var(--success);background-color:var(--success-light);color:var(--text-primary)}.review-option.incorrect-choice{border-color:var(--danger);background-color:var(--danger-light);color:var(--text-primary)}.review-option-letter{font-weight:700;margin-right:8px}.search-bar{display:flex;gap:10px;margin-bottom:25px}.search-input{flex:1;font-family:var(--font-sans);font-size:1rem;padding:12px 16px;border-radius:var(--radius-md);border:1px solid var(--border-color);background-color:var(--bg-card);color:var(--text-primary);outline:none}.search-input:focus{border-color:var(--primary)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:100;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal-content{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:30px;max-width:500px;width:90%;box-shadow:var(--shadow-lg);animation:fadeIn .2s ease-out}.modal-title{font-size:1.25rem;font-weight:700;margin-bottom:15px}.modal-text{font-size:.95rem;color:var(--text-secondary);margin-bottom:25px}.modal-actions{display:flex;justify-content:flex-end;gap:12px}.toast{position:fixed;bottom:24px;right:24px;background-color:var(--bg-card);border:1px solid var(--border-color);box-shadow:var(--shadow-lg);border-radius:var(--radius-md);padding:12px 24px;z-index:1000;display:flex;align-items:center;gap:10px;font-weight:600;font-size:.9rem;animation:fadeIn .25s ease-out;border-left:4px solid var(--primary)}.toast.success{border-left-color:var(--success)}