.html-formatter-container{max-width:1200px;margin:0 auto;padding:20px;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;background:#f8f9fa;border-radius:12px;box-shadow:0 4px 6px rgb(0 0 0 / .1)}.html-formatter-header{text-align:center;margin-bottom:30px;padding:20px;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;border-radius:8px}.html-formatter-header h2{margin:0 0 10px 0;font-size:2rem}.html-formatter-header p{margin:0;opacity:.9;font-size:1.1rem}.html-formatter-controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:15px;margin-bottom:25px;padding:20px;background:#fff;border-radius:8px;box-shadow:0 2px 4px rgb(0 0 0 / .1)}.control-group{display:flex;flex-direction:column}.control-group label{font-weight:600;margin-bottom:8px;color:#333;font-size:.9rem}.form-control{padding:10px 12px;border:2px solid #e9ecef;border-radius:6px;font-size:14px;transition:all 0.3s ease}.form-control:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px rgb(102 126 234 / .1)}.html-formatter-content{display:grid;grid-template-columns:1fr 1fr;gap:25px;margin-bottom:20px}.input-section,.output-section{background:#fff;padding:25px;border-radius:8px;box-shadow:0 2px 4px rgb(0 0 0 / .1)}.input-method{margin-bottom:20px}.input-method label{display:block;font-weight:600;margin-bottom:10px;color:#333}#html-input,#html-output{width:100%;padding:15px;border:2px solid #e9ecef;border-radius:6px;font-family:'Courier New',monospace;font-size:14px;line-height:1.5;resize:vertical;background:#f8f9fa;transition:border-color 0.3s ease}#html-input:focus,#html-output:focus{outline:none;border-color:#667eea}.file-input{width:100%;padding:10px;border:2px dashed #dee2e6;border-radius:6px;background:#f8f9fa;cursor:pointer;transition:all 0.3s ease}.file-input:hover{border-color:#667eea;background:#e9ecef}.file-info{margin-top:10px;padding:10px;background:#e7f3ff;border:1px solid #b3d9ff;border-radius:4px;font-size:14px}.action-buttons{display:flex;gap:10px;margin-top:20px}.btn{padding:12px 20px;border:none;border-radius:6px;font-size:14px;font-weight:600;cursor:pointer;transition:all 0.3s ease;display:flex;align-items:center;gap:8px}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 8px rgb(102 126 234 / .3)}.btn-secondary{background:#6c757d;color:#fff}.btn-secondary:hover:not(:disabled){background:#5a6268;transform:translateY(-2px)}.btn-success{background:#28a745;color:#fff}.btn-success:hover:not(:disabled){background:#218838;transform:translateY(-2px)}.btn-info{background:#17a2b8;color:#fff}.btn-info:hover:not(:disabled){background:#138496;transform:translateY(-2px)}.output-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}.output-header h3{margin:0;color:#333}.output-actions{display:flex;gap:8px}.preview-section{margin-top:25px}.preview-section h3{margin-bottom:15px;color:#333}.preview-container{position:relative;border:2px solid #e9ecef;border-radius:6px;overflow:hidden;background:#fff}#preview-frame{width:100%;height:300px;border:none;background:#fff}.preview-placeholder{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;justify-content:center;align-items:center;background:#f8f9fa;color:#6c757d;text-align:center}.preview-placeholder i{font-size:3rem;margin-bottom:15px;opacity:.5}.preview-placeholder p{margin:0;font-size:1.1rem}.html-formatter-footer{text-align:center;padding:15px;background:#e7f3ff;border-radius:6px;color:#06c;font-size:.9rem}@media (max-width:768px){.html-formatter-content{grid-template-columns:1fr;gap:20px}.html-formatter-controls{grid-template-columns:1fr}.action-buttons{flex-direction:column}.output-header{flex-direction:column;gap:15px;align-items:flex-start}.output-actions{width:100%;justify-content:space-between}.btn{flex:1;justify-content:center}}.loading{position:relative;pointer-events:none}.loading::after{content:'';position:absolute;top:50%;left:50%;width:20px;height:20px;margin:-10px 0 0 -10px;border:2px solid #f3f3f3;border-top:2px solid #667eea;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}.success{background:#d4edda!important;border-color:#c3e6cb!important;color:#155724!important}.error{background:#f8d7da!important;border-color:#f5c6cb!important;color:#721c24!important}