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1fr;gap:1rem;margin-bottom:1rem}.editor-pane{display:flex;flex-direction:column}.pane-header{display:flex;justify-content:space-between;align-items:center;padding:.5rem 0;margin-bottom:.5rem}.pane-header span{font-weight:600;color:#333}.char-count{font-weight:400!important;color:#888!important;font-size:.85rem}.copy-btn{padding:.3rem .8rem;border:1px solid var(--primary-color);background:#fff;color:var(--primary-color);border-radius:4px;font-size:.85rem;cursor:pointer;transition:all .2s}.copy-btn:hover:not(:disabled){background:var(--primary-color);color:#fff}.copy-btn:disabled{opacity:.5;cursor:not-allowed}.editor-pane textarea{flex:1;min-height:300px;padding:1rem;border:1px solid #ddd;border-radius:8px;font-family:Monaco,Menlo,Ubuntu Mono,monospace;font-size:.875rem;line-height:1.6;resize:vertical;background:#f8f9fa}.editor-pane textarea:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #2a6ca01a}.editor-pane textarea.valid-output{background:#d4edda;color:#155724;font-size:1.5rem;display:flex;align-items:center;justify-content:center;text-align:center}.error-output{flex:1;min-height:300px;padding:1.5rem;border:1px solid #f5c6cb;border-radius:8px;background:#fff5f5;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.error-icon{width:60px;height:60px;background:#dc3545;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:2rem;font-weight:700;margin-bottom:1rem}.error-message strong{color:#dc3545;font-size:1.2rem;display:block;margin-bottom:.5rem}.error-message p{color:#721c24;font-family:monospace;font-size:.875rem;word-break:break-word}.stats-bar{display:flex;flex-wrap:wrap;gap:1.5rem;padding:1rem;background:#f8f9fa;border-radius:8px;margin-bottom:1rem}.stat{display:flex;flex-direction:column;gap:.25rem}.stat-label{font-size:.8rem;color:#666;text-transform:uppercase;letter-spacing:.5px}.stat-value{font-weight:600;color:var(--primary-color)}.history-section{margin-top:1rem}.history-section h3{font-size:1.15rem;font-weight:700;color:var(--gray-900);margin-bottom:1.25rem;padding-bottom:.75rem;border-bottom:2px solid var(--primary);letter-spacing:.03em}.history-section:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.history-list{display:flex;flex-wrap:wrap;gap:.5rem}.history-item{display:flex;flex-direction:column;align-items:flex-start;padding:.5rem .75rem;border:1px solid #ddd;background:#f8f9fa;border-radius:6px;cursor:pointer;transition:all .2s;max-width:200px}.history-item:hover{border-color:var(--primary-color);background:#fff}.history-time{font-size:.75rem;color:#888}.history-preview{font-size:.8rem;color:#333;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;font-family:monospace}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.5rem;margin-bottom:2rem}.feature-card{background:#fff;padding:1.5rem;border-radius:10px;box-shadow:0 2px 10px #0000000d;text-align:center}.feature-card h3{font-size:1.3rem;margin-bottom:.5rem}.feature-card p{color:#666;font-size:.95rem;line-height:1.6}.tips-section{background:#f8f9fa;padding:2rem;border-radius:12px;margin-bottom:2rem}.tips-section h2{text-align:center;color:var(--primary-color);margin-bottom:1.5rem}.tips-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.5rem}.tip{background:#fff;padding:1.25rem;border-radius:8px;box-shadow:0 2px 8px #0000000d}.tip h4{color:#333;margin-bottom:.5rem;font-size:1rem}.tip p{color:#666;font-size:.875rem;line-height:1.6}.cta-section{background:linear-gradient(135deg,var(--primary-color),#1e4d6b);color:#fff;padding:3rem 2rem;border-radius:12px;text-align:center}.cta-section h2{margin-bottom:1rem}.cta-section p{opacity:.9;margin-bottom:1.5rem;font-size:1.1rem}.cta-button{display:inline-block;background:#fff;color:var(--primary-color);padding:.875rem 2rem;border-radius:8px;text-decoration:none;font-weight:600;transition:transform .2s,box-shadow .2s}.cta-button:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0003}@media (max-width: 768px){.json-formatter{padding:1rem}.controls-bar{flex-direction:column;align-items:stretch}.action-buttons{justify-content:center}.utility-buttons{margin-left:0;justify-content:center}.editor-container{grid-template-columns:1fr}.editor-pane textarea{min-height:200px}.stats-bar{justify-content:center}}