:root {
            --primary-color: #2c7da0;
            --secondary-color: #a9d6e5;
            --accent-color: #01497c;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --error-color: #dc3545;
            --ipv4-color: #e83e8c;
            --ipv6-color: #6f42c1;
        }
         .page-header {
            background: linear-gradient(135deg, rgba(169, 214, 229, 0.4) 0%, rgba(44, 125, 160, 0.4) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(44, 125, 160, 0.2);
            position: relative;
            overflow: hidden;color:#333
        }
        .breadcrumb {
            background-color: transparent;
            padding: 0.5rem 0;
            margin-bottom: 0.5rem;
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(44, 125, 160, 0.15);
        }
        .ipv4-badge {
            background-color: rgba(232, 62, 140, 0.1);
            color: var(--ipv4-color);
            border: 1px solid rgba(232, 62, 140, 0.3);
        }
        .ipv6-badge {
            background-color: rgba(111, 66, 193, 0.1);
            color: var(--ipv6-color);
            border: 1px solid rgba(111, 66, 193, 0.3);
        }
        .address-display {
            font-family: 'Courier New', monospace;
            font-size: 1.1rem;
            background-color: var(--light-gray);
            padding: 1rem;
            border-radius: 6px;
            margin: 1rem 0;
            border-left: 4px solid var(--primary-color);
            word-break: break-all;
        }
        .ipv4-address {
            border-left-color: var(--ipv4-color);
        }
        .ipv6-address {
            border-left-color: var(--ipv6-color);
        }
        .conversion-method {
            background-color: white;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            transition: all 0.3s;
        }
        .conversion-method:hover {
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
        }
        .method-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
        }
        .method-name {
            font-weight: 600;
            color: var(--primary-color);
        }
        .method-badge {
            font-size: 0.8rem;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
        }
        .method-desc {
            color: var(--text-muted);
            margin-bottom: 1rem;
        }
        .method-result {
            font-family: 'Courier New', monospace;
            background-color: var(--light-gray);
            padding: 0.75rem;
            border-radius: 4px;
            font-size: 0.95rem;
            word-break: break-all;
        }
        .binary-visualization {
            margin: 1.5rem 0;
        }
        .binary-row {
            display: flex;
            margin-bottom: 0.5rem;
            align-items: center;
        }
        .binary-label {
            min-width: 80px;
            font-weight: 600;
            color: var(--text-muted);
        }
        .binary-bits {
            display: flex;
            flex-wrap: wrap;
            gap: 2px;
        }
        .bit {
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: #f1f3f4;
            border-radius: 3px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .bit-1 {
            background-color: rgba(111, 66, 193, 0.2);
            color: var(--ipv6-color);
        }
        .bit-0 {
            background-color: rgba(232, 62, 140, 0.2);
            color: var(--ipv4-color);
        }
        .bit-separator {
            margin: 0 5px;
            color: var(--text-muted);
            font-weight: bold;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        .comparison-table th, .comparison-table td {
            padding: 0.75rem;
            text-align: left;
            border: 1px solid var(--border-color);
        }
        .comparison-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        .comparison-table tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }
        .quick-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .quick-action-btn {
            background-color: rgba(44, 125, 160, 0.1);
            border: 1px solid rgba(44, 125, 160, 0.2);
            border-radius: 4px;
            padding: 0.5rem 0.75rem;
            font-size: 0.9rem;
            color: var(--primary-color);
            cursor: pointer;
            transition: all 0.2s;
        }
        .quick-action-btn:hover {
            background-color: rgba(44, 125, 160, 0.2);
            transform: translateY(-2px);
        }
        @media (max-width: 768px) {
            .binary-bits {
                gap: 1px;
            }
            .bit {
                width: 16px;
                height: 16px;
                font-size: 0.7rem;
            }
        }
        .warning-box {
            background-color: rgba(255, 193, 7, 0.1);
            border-left: 3px solid var(--warning-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .error-box {
            background-color: rgba(220, 53, 69, 0.1);
            border-left: 3px solid var(--error-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .conversion-tabs {
            display: flex;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 1.5rem;
            overflow-x: auto;
        }
        .conversion-tab {
            padding: 0.75rem 1.5rem;
            background: none;
            border: none;
            font-weight: 500;
            color: var(--text-muted);
            cursor: pointer;
            border-bottom: 3px solid transparent;
            transition: all 0.3s;
            white-space: nowrap;
        }
        .conversion-tab:hover {
            color: var(--primary-color);
        }
        .conversion-tab.active {
            color: var(--primary-color);
            border-bottom: 3px solid var(--primary-color);
        }
        .bulk-conversion {
            margin-top: 1.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border-color);
        }
        .bulk-textarea {
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
            height: 150px;
            resize: vertical;
        }
        .bulk-results {
            margin-top: 1rem;
            max-height: 300px;
            overflow-y: auto;
            border: 1px solid var(--border-color);
            border-radius: 6px;
        }
        .bulk-result-item {
            padding: 0.75rem;
            border-bottom: 1px solid var(--border-color);
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
        }
        .bulk-result-item:last-child {
            border-bottom: none;
        }
        .advanced-options {
            margin: 1rem 0;
            padding: 1rem;
            background-color: var(--light-gray);
            border-radius: 6px;
            border: 1px solid var(--border-color);
        }
        .advanced-toggle {
            background: none;
            border: none;
            color: var(--primary-color);
            font-weight: 600;
            cursor: pointer;
            display: flex;
            align-items: center;
            padding: 0;
        }
        .advanced-content {
            margin-top: 1rem;
            display: none;
        }
        .advanced-content.show {
            display: block;
        }
        .normalization-tools {
            display: flex;
            gap: 0.5rem;
            margin-top: 1rem;
        }
        .normalization-result {
            font-family: 'Courier New', monospace;
            background-color: var(--light-gray);
            padding: 0.75rem;
            border-radius: 4px;
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .test-cases {
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border-color);
        }
        .test-case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1rem;
            margin-top: 1rem;
        }
        .test-case {
            background-color: var(--light-gray);
            padding: 1rem;
            border-radius: 6px;
            border: 1px solid var(--border-color);
        }
        .test-case-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        .test-case-result {
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
        }
        .loader {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 2px solid #f3f3f3;
            border-top: 2px solid var(--primary-color);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-right: 0.5rem;
            vertical-align: middle;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .status-indicator {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            margin-right: 5px;
        }
        .status-success {
            background-color: var(--success-color);
        }
        .status-warning {
            background-color: var(--warning-color);
        }
        .status-error {
            background-color: var(--error-color);
        }
        .address-type-badge {
            font-size: 0.7rem;
            padding: 0.2rem 0.5rem;
            border-radius: 10px;
            margin-left: 0.5rem;
        }
        .conversion-limits {
            background-color: rgba(255, 193, 7, 0.1);
            padding: 1rem;
            border-radius: 6px;
            margin: 1.5rem 0;
            border: 1px solid rgba(255, 193, 7, 0.3);
        }
        .conversion-limits h5 {
            color: var(--warning-color);
            margin-bottom: 0.5rem;
        }
        .worker-status {
            display: none;
            align-items: center;
            background-color: rgba(44, 125, 160, 0.1);
            padding: 0.5rem;
            border-radius: 4px;
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .worker-status.active {
            display: flex;
        }