:root{--stat-tool:#e11d48;--stat-tool-dark:#be123c;--stat-gradient:linear-gradient(135deg,#e11d48 0%,#f43f5e 100%);--stat-light:#fff1f2}[data-theme="dark"]{--stat-light:rgba(225,29,72,0.15)}.stat-mode-toggle{display:flex;border:1.5px solid var(--border);border-radius:0.5rem;overflow:hidden;margin-bottom:1rem}.stat-mode-btn{flex:1;padding:0.5rem 0.75rem;font-weight:600;font-size:0.75rem;border:none;cursor:pointer;background:var(--bg-secondary);color:var(--text-secondary);transition:all 0.15s;font-family:var(--font-sans);text-align:center;white-space:nowrap}.stat-mode-btn.active{background:var(--stat-gradient);color:#fff}.stat-mode-btn:hover:not(.active){background:var(--bg-tertiary)}[data-theme="dark"] .stat-mode-btn{background:var(--bg-tertiary)}[data-theme="dark"] .stat-mode-btn.active{background:var(--stat-gradient);color:#fff}.stat-input-group{margin-bottom:0.75rem}.stat-input-label{display:block;font-size:0.6875rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:0.05em;margin-bottom:0.25rem}.stat-input-text{width:100%;padding:0.625rem 0.75rem;font-size:0.875rem;font-family:var(--font-mono);border:1.5px solid var(--border);border-radius:0.375rem;background:var(--bg-primary);color:var(--text-primary);transition:border-color 0.15s;line-height:1.5}textarea.stat-input-text{resize:vertical;min-height:120px}input.stat-input-text{padding:0.5rem 0.75rem;font-family:var(--font-sans)}.stat-input-text:focus{outline:none;border-color:var(--stat-tool);box-shadow:0 0 0 2px rgba(225,29,72,0.1)}.stat-preview{min-height:2rem;padding:0.5rem 0.75rem;border:1.5px dashed var(--border);border-radius:0.5rem;background:var(--bg-secondary);font-size:0.8125rem;display:flex;align-items:center;gap:0.5rem;color:var(--text-secondary)}.stat-preview-count{font-weight:700;color:var(--stat-tool);font-family:var(--font-mono)}[data-theme="dark"] .stat-preview{background:var(--bg-tertiary)}.stat-output-tabs{display:flex;border:1.5px solid var(--border);border-radius:0.5rem;overflow:hidden}.stat-output-tab{flex:1;padding:0.5rem;font-weight:600;font-size:0.8125rem;border:none;cursor:pointer;background:var(--bg-secondary);color:var(--text-secondary);transition:all 0.15s;font-family:var(--font-sans);text-align:center}.stat-output-tab.active{background:var(--stat-gradient);color:#fff}.stat-output-tab:hover:not(.active){background:var(--bg-tertiary)}[data-theme="dark"] .stat-output-tab{background:var(--bg-tertiary)}[data-theme="dark"] .stat-output-tab.active{background:var(--stat-gradient);color:#fff}.stat-panel{display:none;flex:1;min-height:0}.stat-panel.active{display:flex;flex-direction:column}.stat-step{display:flex;gap:0.75rem;padding:0.75rem;margin:0.5rem 0;background:var(--bg-secondary);border-radius:0.5rem;border-left:3px solid var(--stat-tool);transition:background 0.15s}.stat-step:hover{background:var(--bg-tertiary)}.stat-step-number{width:1.5rem;height:1.5rem;border-radius:50%;background:var(--stat-gradient);color:#fff;display:flex;align-items:center;justify-content:center;font-size:0.6875rem;font-weight:700;flex-shrink:0;margin-top:0.125rem}.stat-step-content{flex:1;min-width:0;max-width:100%;overflow:hidden}.stat-step-desc{font-size:0.8125rem;font-weight:500;color:var(--text-primary);margin-bottom:0.375rem}.stat-step-math{overflow-x:auto;overflow-y:hidden;padding:0.25rem 0;max-width:100%}.stat-step-math .katex-display{margin:0;overflow-x:auto;overflow-y:hidden;max-width:100%}.stat-step-math .katex{font-size:0.9em;max-width:100%}[data-theme="dark"] .stat-step{background:var(--bg-tertiary)}.stat-result-badge{display:inline-block;background:var(--stat-gradient);color:#fff;padding:0.2rem 0.625rem;border-radius:0.75rem;font-size:0.6875rem;font-weight:600;margin-right:0.375rem;margin-bottom:0.375rem}.stat-section{margin-bottom:1rem}.stat-section-title{font-size:0.75rem;font-weight:600;text-transform:uppercase;letter-spacing:0.05em;color:var(--stat-tool);margin-bottom:0.5rem;padding-bottom:0.375rem;border-bottom:2px solid var(--stat-light);display:flex;align-items:center;gap:0.375rem}.stat-row{display:flex;justify-content:space-between;align-items:baseline;padding:0.375rem 0;border-bottom:1px solid var(--border);font-size:0.8125rem}.stat-row:last-child{border-bottom:none}.stat-label{font-weight:500;color:var(--text-primary)}.stat-value{font-weight:600;color:var(--stat-tool);font-family:var(--font-mono);font-size:0.8125rem}.stat-freq-table{width:100%;border-collapse:collapse;font-size:0.75rem;margin-top:0.5rem}.stat-freq-table th,.stat-freq-table td{padding:0.375rem 0.5rem;text-align:left;border-bottom:1px solid var(--border)}.stat-freq-table th{font-weight:600;color:#fff;background:var(--stat-gradient);font-size:0.6875rem;text-transform:uppercase;letter-spacing:0.03em}.stat-freq-table td{color:var(--text-secondary);font-family:var(--font-mono)}.stat-freq-table tr:hover td{background:var(--bg-secondary)}[data-theme="dark"] .stat-freq-table th{background:var(--stat-gradient)}.stat-interpretation{padding:0.75rem 1rem;border-radius:0.5rem;margin:0.75rem 0;font-size:0.8125rem;line-height:1.6}.stat-interpretation-normal{background:linear-gradient(135deg,#d1fae5,var(--bg-primary));border-left:4px solid #10b981;color:#065f46}.stat-interpretation-warning{background:linear-gradient(135deg,#fef3c7,var(--bg-primary));border-left:4px solid #f59e0b;color:#92400e}[data-theme="dark"] .stat-interpretation-normal{background:rgba(16,185,129,0.15);color:#6ee7b7}[data-theme="dark"] .stat-interpretation-warning{background:rgba(245,158,11,0.15);color:#fbbf24}.stat-examples{display:flex;flex-wrap:wrap;gap:0.375rem}.stat-example-chip{padding:0.3rem 0.625rem;font-size:0.6875rem;font-weight:500;border-radius:2rem;border:1px solid var(--border);background:var(--bg-secondary);color:var(--text-secondary);cursor:pointer;transition:all 0.15s;font-family:var(--font-sans)}.stat-example-chip:hover{background:var(--stat-light);color:var(--stat-tool);border-color:var(--stat-tool)}[data-theme="dark"] .stat-example-chip{background:var(--bg-tertiary);border-color:var(--border);color:var(--text-secondary)}[data-theme="dark"] .stat-example-chip:hover{background:var(--stat-light);color:var(--stat-tool)}.stat-edu-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:0.75rem;margin:1rem 0}.stat-edu-card{padding:1rem;background:var(--bg-secondary);border-radius:0.5rem;border-left:3px solid var(--stat-tool)}.stat-edu-card h4{font-size:0.875rem;font-weight:600;color:var(--text-primary);margin:0 0 0.375rem}.stat-edu-card p{font-size:0.8125rem;color:var(--text-secondary);margin:0;line-height:1.6}[data-theme="dark"] .stat-edu-card{background:var(--bg-tertiary)}.stat-feature-card{padding:1.25rem;background:var(--bg-secondary);border-radius:0.5rem;border:1px solid var(--border);transition:transform 0.2s,box-shadow 0.2s}.stat-feature-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(225,29,72,0.15)}.stat-feature-card h4{font-size:0.875rem;font-weight:600;color:var(--text-primary);margin:0.5rem 0 0.375rem}.stat-feature-card p{font-size:0.8125rem;color:var(--text-secondary);margin:0;line-height:1.6}[data-theme="dark"] .stat-feature-card{background:var(--bg-tertiary);border-color:var(--border)}.stat-formula-box{background:var(--bg-secondary);border-left:3px solid var(--stat-tool);padding:0.75rem 1rem;border-radius:0 0.375rem 0.375rem 0;margin:0.75rem 0;font-family:var(--font-mono);font-size:0.9375rem;color:var(--text-primary);overflow-x:auto}.stat-formula-box .katex{font-size:1em}[data-theme="dark"] .stat-formula-box{background:var(--bg-tertiary)}.stat-worked-example{background:var(--bg-secondary);padding:1rem 1.25rem;border-radius:0.5rem;font-family:var(--font-mono);font-size:0.8125rem;line-height:2;overflow-x:auto;color:var(--text-primary);margin:0.75rem 0}[data-theme="dark"] .stat-worked-example{background:var(--bg-tertiary)}.stat-ops-table{width:100%;border-collapse:collapse;font-size:0.8125rem;margin-top:0.75rem}.stat-ops-table th,.stat-ops-table td{padding:0.5rem 0.75rem;text-align:left;border-bottom:1px solid var(--border)}.stat-ops-table th{font-weight:600;color:var(--text-primary);background:var(--bg-secondary)}.stat-ops-table td{color:var(--text-secondary);font-family:var(--font-mono);font-size:0.75rem}[data-theme="dark"] .stat-ops-table th{background:var(--bg-tertiary)}.stat-checkbox-group{display:flex;flex-direction:column;gap:0.5rem;margin-bottom:0.75rem}.stat-checkbox{display:flex;align-items:center;gap:0.5rem;font-size:0.8125rem;color:var(--text-primary);cursor:pointer}.stat-checkbox input[type="checkbox"]{width:1rem;height:1rem;accent-color:var(--stat-tool);cursor:pointer}.stat-error{background:#fef3c7;border:1px solid #fbbf24;border-radius:0.5rem;padding:1.25rem;color:#92400e}.stat-error h4{margin:0 0 0.5rem;font-size:0.9375rem;font-weight:700}.stat-error p{margin:0;font-size:0.8125rem;line-height:1.6}[data-theme="dark"] .stat-error{background:rgba(251,191,36,0.15);border-color:rgba(251,191,36,0.3);color:#fbbf24}.stat-sep{border:none;border-top:1px solid var(--border);margin:0.75rem 0}@keyframes stat-spin{to{transform:rotate(360deg)}}.stat-spinner{width:14px;height:14px;border:2px solid var(--border);border-top-color:var(--stat-tool);border-radius:50%;animation:stat-spin 0.6s linear infinite;display:inline-block}.tool-output-column{min-width:0}#stat-result-content{min-width:0;overflow-x:auto;overflow-y:auto}#stat-graph-container{width:100%;min-height:440px;border-radius:0.5rem}.stat-anim{opacity:0;transform:translateY(1rem);transition:opacity 0.5s ease,transform 0.5s ease}.stat-anim.stat-visible{opacity:1;transform:translateY(0)}.stat-anim-d1{transition-delay:0.1s}.stat-anim-d2{transition-delay:0.2s}.stat-anim-d3{transition-delay:0.3s}.stat-anim-d4{transition-delay:0.4s}.stat-bell-animated .bell-path{stroke-dasharray:500;stroke-dashoffset:500;animation:stat-draw-bell 2s ease forwards}@keyframes stat-draw-bell{to{stroke-dashoffset:0}}.stat-data-flow .data-dot{animation:stat-flow 1.5s ease infinite}@keyframes stat-flow{0%{opacity:0;transform:translateY(-10px)}50%{opacity:1}100%{opacity:0;transform:translateY(10px)}}.stat-faq-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;padding:0.875rem 0;background:none;border:none;font-size:0.875rem;font-weight:600;color:var(--text-primary);cursor:pointer;text-align:left;font-family:var(--font-sans);gap:0.75rem}@media (prefers-reduced-motion:reduce){.stat-anim{opacity:1;transform:none;transition:none}.stat-bell-animated .bell-path{animation:none;stroke-dashoffset:0}.stat-data-flow .data-dot{animation:none;opacity:1}.stat-feature-card{transition:none}}.av-group-box{background:var(--bg-secondary);border:1px solid var(--border);border-radius:0.5rem;padding:0.75rem;margin-bottom:0.5rem}[data-theme="dark"] .av-group-box{background:var(--bg-tertiary);border-color:var(--border)}.av-group-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:0.375rem}.av-group-header h5{margin:0;font-size:0.8125rem;font-weight:600;color:var(--text-primary)}.av-remove-group-btn{background:none;border:1px solid var(--border);border-radius:0.375rem;width:1.5rem;height:1.5rem;display:flex;align-items:center;justify-content:center;font-size:1rem;color:var(--text-muted);cursor:pointer;transition:all 0.15s;line-height:1}.av-remove-group-btn:hover{background:#fef2f2;border-color:#ef4444;color:#ef4444}[data-theme="dark"] .av-remove-group-btn:hover{background:rgba(239,68,68,0.15)}.stat-textarea{width:100%;padding:0.5rem 0.75rem;font-size:0.8rem;font-family:var(--font-mono);border:1.5px solid var(--border);border-radius:0.375rem;background:var(--bg-primary);color:var(--text-primary);transition:border-color 0.15s;line-height:1.5;resize:vertical;min-height:50px}.stat-textarea:focus{outline:none;border-color:var(--stat-tool);box-shadow:0 0 0 2px rgba(225,29,72,0.1)}[data-theme="dark"] .stat-textarea{background:var(--bg-secondary);border-color:var(--border)}@media (max-width:900px){.stat-row{font-size:0.75rem}.stat-freq-table{font-size:0.6875rem}}@media (max-width:640px){.stat-mode-toggle{flex-wrap:wrap}.stat-mode-btn{flex:1 1 50%;font-size:0.6875rem}.stat-edu-grid{grid-template-columns:1fr}.stat-step-math .katex{font-size:0.8em}.stat-section-title{font-size:0.6875rem}}