:root{--primary-color:#4361ee;--secondary-color:#3a0ca3;--accent-color:#7209b7;--light-color:#f8f9fa;--dark-color:#212529;--gray-color:#6c757d;--success-color:#4cc9f0;--warning-color:#f72585;--json-color:#f7df1e;--excel-color:#217346;--csv-color:#ff6b35;--border-radius:12px;--box-shadow:0 8px 24px rgba(0,0,0,0.1);--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI','Microsoft YaHei',sans-serif}body{background-color:#f0f2f5;color:var(--dark-color);line-height:1.6}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}header{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:white;padding:20px 0;box-shadow:0 4px 12px rgba(0,0,0,0.1);position:sticky;top:0;z-index:100}.header-content{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:15px}.logo i{font-size:2.5rem}.logo h1{font-size:1.8rem;font-weight:700}.logo span{color:var(--success-color)}nav ul{display:flex;list-style:none;gap:25px}nav a{color:white;text-decoration:none;font-weight:600;font-size:1.1rem;padding:8px 12px;border-radius:6px;transition:var(--transition)}nav a:hover,nav a.active{background-color:rgba(255,255,255,0.2)}.mobile-menu-btn{display:none;font-size:1.5rem;background:none;border:none;color:white;cursor:pointer}main{padding:40px 0}.tool-section{display:none;animation:fadeIn 0.5s ease}.tool-section.active{display:block}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.section-title{font-size:1.8rem;margin-bottom:25px;color:var(--secondary-color);display:flex;align-items:center;gap:10px}.section-title i{color:var(--accent-color)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px;margin-bottom:40px}.tool-card{background:white;border-radius:var(--border-radius);padding:25px;box-shadow:var(--box-shadow);transition:var(--transition);cursor:pointer;border:2px solid transparent}.tool-card:hover{transform:translateY(-5px);border-color:var(--primary-color)}.tool-card i{font-size:2.5rem;color:var(--primary-color);margin-bottom:15px}.tool-card h3{font-size:1.4rem;margin-bottom:10px;color:var(--dark-color)}.tool-card p{color:var(--gray-color);margin-bottom:20px}.use-tool-btn{background-color:var(--primary-color);color:white;border:none;padding:10px 20px;border-radius:6px;font-weight:600;cursor:pointer;transition:var(--transition);width:100%}.use-tool-btn:hover{background-color:var(--secondary-color)}.tool-detail{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-top:30px}.tool-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px;padding-bottom:15px;border-bottom:2px solid #f0f2f5}.tool-header h2{font-size:1.6rem;color:var(--secondary-color)}.close-tool{background:none;border:none;font-size:1.5rem;color:var(--gray-color);cursor:pointer;transition:var(--transition)}.close-tool:hover{color:var(--warning-color)}.converter-container{display:flex;flex-direction:column;gap:20px}.converter-row{display:flex;flex-wrap:wrap;gap:20px}.converter-col{flex:1;min-width:300px}.converter-col h3{margin-bottom:10px;color:var(--dark-color);font-size:1.2rem;display:flex;align-items:center;gap:8px}.json-label{color:var(--json-color)}.excel-label{color:var(--excel-color)}.csv-label{color:var(--csv-color)}textarea{width:100%;height:350px;padding:15px;border:2px solid #e0e0e0;border-radius:var(--border-radius);font-family:'Consolas','Monaco','Courier New',monospace;font-size:0.95rem;line-height:1.5;resize:vertical;transition:var(--transition)}textarea:focus{outline:none;border-color:var(--primary-color)}#json-input{border-left:4px solid var(--json-color)}#csv-output{border-left:4px solid var(--csv-color)}.converter-actions{display:flex;gap:15px;flex-wrap:wrap}.action-btn{padding:12px 24px;border-radius:6px;border:none;font-weight:600;cursor:pointer;transition:var(--transition);display:flex;align-items:center;gap:8px}.btn-primary{background-color:var(--primary-color);color:white}.btn-primary:hover{background-color:var(--secondary-color)}.btn-secondary{background-color:#e9ecef;color:var(--dark-color)}.btn-secondary:hover{background-color:#dee2e6}.btn-success{background-color:var(--success-color);color:white}.btn-success:hover{background-color:#2db7d8}.btn-warning{background-color:var(--warning-color);color:white}.btn-warning:hover{background-color:#d1146a}.btn-json{background-color:var(--json-color);color:#333}.btn-json:hover{background-color:#e6ce1b}.btn-excel{background-color:var(--excel-color);color:white}.btn-excel:hover{background-color:#1a5a38}.btn-csv{background-color:var(--csv-color);color:white}.btn-csv:hover{background-color:#e55a2b}.file-upload-area{border:3px dashed #ddd;border-radius:var(--border-radius);padding:40px 20px;text-align:center;margin-bottom:20px;transition:var(--transition);background-color:#f9f9f9}.file-upload-area:hover{border-color:var(--primary-color);background-color:#f0f7ff}.file-upload-area.dragover{border-color:var(--primary-color);background-color:#e6f0ff}.file-upload-area i{font-size:3rem;color:var(--json-color);margin-bottom:15px}.file-upload-area h4{font-size:1.2rem;margin-bottom:10px;color:var(--dark-color)}.file-upload-area p{color:var(--gray-color);margin-bottom:20px}.file-input-wrapper{position:relative;display:inline-block}.file-input-wrapper input[type="file"]{position:absolute;left:0;top:0;opacity:0;width:100%;height:100%;cursor:pointer}.file-input-btn{background-color:var(--json-color);color:#333;padding:10px 20px;border-radius:6px;font-weight:600;cursor:pointer;transition:var(--transition);display:inline-flex;align-items:center;gap:8px}.file-input-btn:hover{background-color:#e6ce1b}.file-info{margin-top:15px;padding:10px 15px;background-color:#f9f9f9;border-radius:6px;display:flex;align-items:center;gap:10px;color:var(--json-color)}.file-info.hidden{display:none}.file-info i{font-size:1.2rem}.validation-status{padding:12px 20px;border-radius:var(--border-radius);margin-top:10px;display:flex;align-items:center;gap:10px;font-weight:600;transition:var(--transition)}.status-valid{background-color:rgba(6,214,160,0.1);border-left:4px solid var(--success-color);color:var(--success-color)}.status-invalid{background-color:rgba(239,71,111,0.1);border-left:4px solid var(--warning-color);color:var(--warning-color)}.status-warning{background-color:rgba(247,37,133,0.1);border-left:4px solid var(--warning-color);color:var(--warning-color)}.stats{display:flex;gap:15px;flex-wrap:wrap;margin-top:20px}.stat-box{background:#f8f9fa;padding:15px;border-radius:8px;flex:1;min-width:150px;text-align:center}.stat-value{font-size:1.8rem;font-weight:700;color:var(--primary-color)}.stat-label{color:var(--gray-color);font-size:0.9rem;margin-top:5px}.error-details{margin-top:20px;padding:20px;border-radius:var(--border-radius);background-color:rgba(239,71,111,0.05);border:1px solid rgba(239,71,111,0.2);display:none}.error-details.show{display:block;animation:fadeIn 0.3s ease}.error-details h4{color:var(--warning-color);margin-bottom:15px;display:flex;align-items:center;gap:8px}.error-list{list-style:none}.error-item{padding:10px 15px;border-left:3px solid var(--warning-color);margin-bottom:10px;background-color:white;border-radius:4px;box-shadow:0 2px 4px rgba(0,0,0,0.05)}.error-position{font-weight:600;color:var(--dark-color);margin-bottom:5px;display:flex;align-items:center;gap:8px}.error-message{color:var(--gray-color);font-size:0.9rem}.config-options{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:15px;margin-top:15px}.option-group{background:#f8f9fa;padding:15px;border-radius:8px}.option-group h4{margin-bottom:10px;color:var(--secondary-color);font-size:1rem;display:flex;align-items:center;gap:8px}.checkbox-label{display:flex;align-items:center;gap:8px;margin-bottom:8px;cursor:pointer;font-size:0.95rem}.checkbox-label input[type="checkbox"]{width:16px;height:16px;cursor:pointer}.checkbox-label input[type="radio"]{width:16px;height:16px;cursor:pointer}.text-input{width:100%;padding:8px 12px;border:1px solid #ddd;border-radius:4px;font-size:0.95rem;margin-top:5px}.select-input{width:100%;padding:8px 12px;border:1px solid #ddd;border-radius:4px;font-size:0.95rem;margin-top:5px;background:white}.range-input{width:100%;margin-top:8px}.range-value{display:inline-block;margin-left:10px;font-weight:600;color:var(--primary-color);min-width:30px}.preview-table-container{margin-top:30px;border-radius:var(--border-radius);overflow:hidden;border:1px solid #e0e0e0;background:white}.preview-header{background:#f8f9fa;padding:10px 15px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #e0e0e0}.preview-title{font-weight:600;color:var(--dark-color)}.preview-content{overflow-x:auto;max-height:300px}.preview-table{width:100%;border-collapse:collapse;font-size:0.9rem}.preview-table th,.preview-table td{padding:10px 12px;text-align:left;border-bottom:1px solid #eee;border-right:1px solid #eee;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.preview-table th{background-color:#f8f9fa;font-weight:600;color:var(--dark-color);position:sticky;top:0}.preview-table th:last-child,.preview-table td:last-child{border-right:none}.preview-table tr:hover{background-color:#f9f9f9}.json-tree{margin-top:30px;border-radius:var(--border-radius);border:1px solid #e0e0e0;background:white;padding:20px;font-family:'Consolas','Monaco','Courier New',monospace;font-size:0.9rem;max-height:300px;overflow-y:auto}.json-tree ul{list-style:none;margin-left:20px}.json-tree li{margin-bottom:5px}.json-key{color:#e06c75;font-weight:bold}.json-type{color:#61afef;font-style:italic;margin-left:10px}.json-value{color:#98c379}.json-number{color:#d19a66}.json-boolean{color:#c678dd}.json-null{color:#5c6370}.examples{margin-top:30px;background:#f8f9fa;border-radius:var(--border-radius);padding:20px}.examples h3{margin-bottom:15px;color:var(--secondary-color);display:flex;align-items:center;gap:8px}.example-buttons{display:flex;gap:10px;flex-wrap:wrap}.example-btn{padding:8px 16px;background-color:white;border:1px solid #ddd;border-radius:6px;cursor:pointer;transition:var(--transition);font-size:0.9rem}.example-btn:hover{background-color:var(--primary-color);color:white;border-color:var(--primary-color)}footer{background-color:var(--dark-color);color:white;padding:40px 0;margin-top:60px}.footer-content{display:flex;flex-wrap:wrap;justify-content:space-between;gap:40px}.footer-section{flex:1;min-width:250px}.footer-section h3{font-size:1.3rem;margin-bottom:20px;color:var(--success-color)}.footer-links{list-style:none}.footer-links li{margin-bottom:10px}.footer-links a{color:#ddd;text-decoration:none;transition:var(--transition)}.footer-links a:hover{color:var(--success-color)}.copyright{text-align:center;margin-top:40px;padding-top:20px;border-top:1px solid #444;color:#aaa;font-size:0.9rem}.json-syntax{position:relative}.line-numbers{position:absolute;left:0;top:0;width:40px;height:100%;padding:15px 5px;text-align:right;font-family:'Consolas','Monaco','Courier New',monospace;font-size:0.95rem;color:#999;background-color:#f5f5f5;border-right:1px solid #e0e0e0;border-radius:var(--border-radius) 0 0 var(--border-radius);overflow:hidden;user-select:none}.json-content{padding-left:50px}.tabs{display:flex;border-bottom:2px solid #f0f2f5;margin-bottom:20px}.tab{padding:12px 24px;cursor:pointer;font-weight:600;border-bottom:3px solid transparent;transition:var(--transition)}.tab:hover{background-color:#f8f9fa}.tab.active{border-bottom-color:var(--primary-color);color:var(--primary-color)}.tab-content{display:none;animation:fadeIn 0.3s ease}.tab-content.active{display:block}@media (max-width:768px){.header-content{flex-direction:column;gap:20px}nav ul{flex-direction:column;gap:10px;text-align:center}.mobile-menu-btn{display:block;position:absolute;top:25px;right:20px}.mobile-menu{display:none;width:100%;margin-top:15px}.mobile-menu.show{display:block}.converter-row{flex-direction:column}.converter-col{min-width:100%}.converter-actions{flex-direction:column}.action-btn{width:100%;justify-content:center}.config-options{grid-template-columns:1fr}.preview-table th,.preview-table td{padding:6px 8px;font-size:0.8rem}.json-tree{max-height:250px}}.tooltip{position:relative;display:inline-block;margin-left:5px}.tooltip .tooltip-text{visibility:hidden;width:200px;background-color:var(--dark-color);color:white;text-align:center;border-radius:6px;padding:8px;position:absolute;z-index:1;bottom:125%;left:50%;margin-left:-100px;opacity:0;transition:opacity 0.3s;font-size:0.85rem;font-weight:normal}.tooltip .tooltip-text::after{content:"";position:absolute;top:100%;left:50%;margin-left:-5px;border-width:5px;border-style:solid;border-color:var(--dark-color) transparent transparent transparent}.tooltip:hover .tooltip-text{visibility:visible;opacity:1}.download-options{background:#f8f9fa;border-radius:var(--border-radius);padding:20px;margin-top:20px}.download-options h3{margin-bottom:15px;color:var(--secondary-color);display:flex;align-items:center;gap:8px}.option-row{display:flex;gap:15px;flex-wrap:wrap;margin-bottom:15px}.option-item{flex:1;min-width:200px}.option-item label{display:block;margin-bottom:5px;font-weight:600;color:var(--dark-color)}.flatten-options{background:#f0f7ff;border-radius:8px;padding:15px;margin-top:10px;border-left:4px solid var(--primary-color)}.flatten-options h5{margin-bottom:10px;color:var(--primary-color);display:flex;align-items:center;gap:8px}