:root {
            --primary-color: #2c7da0;
            --secondary-color: #a9d6e5;
            --accent-color: #01497c;
            --network-color: #198754;
            --broadcast-color: #dc3545;
            --host-color: #0d6efd;
            --subnet-color: #6f42c1;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
        }
       
        .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);
        }
        .ip-input {
            font-family: 'Courier New', monospace;
            font-size: 1.1rem;
        }
        .ip-visualization {
            background-color: #f8f9fa;
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border: 1px solid #e9ecef;
        }
        .ip-bits {
            display: flex;
            flex-wrap: wrap;
            margin: 1rem 0;
        }
        .ip-bit {
            width: 30px;
            height: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid #dee2e6;
            font-family: 'Courier New', monospace;
            font-weight: 600;
            margin: 1px;
            background-color: white;
        }
        .network-bit {
            background-color: rgba(25, 135, 84, 0.2);
            border-color: var(--network-color);
        }
        .host-bit {
            background-color: rgba(13, 110, 253, 0.2);
            border-color: var(--host-color);
        }
        .bit-label {
            font-size: 0.7rem;
            margin-top: 0.25rem;
            text-align: center;
            color: var(--text-muted);
        }
        .summary-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .network-value {
            color: var(--network-color);
        }
        .broadcast-value {
            color: var(--broadcast-color);
        }
        .host-value {
            color: var(--host-color);
        }
        .subnet-table-container {
            overflow-x: auto;
            margin: 1.5rem 0;
        }
        .subnet-table {
            width: 100%;
            border-collapse: collapse;
        }
        .subnet-table th {
            background-color: var(--light-gray);
            padding: 0.75rem;
            text-align: left;
            border: 1px solid var(--border-color);
            font-weight: 600;
        }
        .subnet-table td {
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            font-family: 'Courier New', monospace;
        }
        .subnet-table tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }
        .network-box {
            background-color: rgba(25, 135, 84, 0.05);
            border-left: 3px solid var(--network-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .cidr-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        .cidr-table th, .cidr-table td {
            padding: 0.75rem;
            text-align: center;
            border: 1px solid var(--border-color);
        }
        .cidr-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        .cidr-table tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }
        .example-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .example-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;
            font-family: 'Courier New', monospace;
        }
        .example-btn:hover {
            background-color: rgba(44, 125, 160, 0.2);
            transform: translateY(-2px);
        }
        @media (max-width: 768px) {
            .summary-grid {
                grid-template-columns: 1fr;
            }
        }
        .nav-tabs {
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 1.5rem;
        }
        .nav-tabs .nav-tabs .binary-row {
            display: flex;
            align-items: center;
            margin-bottom: 0.5rem;
            padding: 0.5rem;
            background-color: white;
            border-radius: 4px;
            border: 1px solid var(--border-color);
        }
        .binary-label {
            min-width: 120px;
            font-weight: 600;
        }
        .binary-bits {
            display: flex;
            flex-wrap: wrap;
        }
        .binary-bit {
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid #dee2e6;
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
            margin: 0 1px;
        }
        .bit-1 {
            background-color: rgba(13, 110, 253, 0.2);
            color: var(--host-color);
            font-weight: 700;
        }
        .bit-0 {
            background-color: #f8f9fa;
            color: var(--text-muted);
        }
        .class-indicator {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-left: 0.5rem;
        }
        .class-a {
            background-color: rgba(25, 135, 84, 0.1);
            color: var(--network-color);
        }
        .class-b {
            background-color: rgba(13, 110, 253, 0.1);
            color: var(--host-color);
        }
        .class-c {
            background-color: rgba(111, 66, 193, 0.1);
            color: var(--subnet-color);
        }
        .class-other {
            background-color: rgba(108, 117, 125, 0.1);
            color: var(--text-muted);
        }
        .range-visual {
            height: 40px;
            background: linear-gradient(90deg, #f8f9fa 0%, #e9ecef 100%);
            border-radius: 4px;
            margin: 1rem 0;
            position: relative;
        }
        .range-network {
            position: absolute;
            height: 100%;
            background-color: rgba(25, 135, 84, 0.3);
            border-left: 2px solid var(--network-color);
            border-right: 2px solid var(--network-color);
        }
        .range-broadcast {
            position: absolute;
            height: 100%;
            background-color: rgba(220, 53, 69, 0.3);
            border-left: 2px solid var(--broadcast-color);
            border-right: 2px solid var(--broadcast-color);
        }
        .range-host {
            position: absolute;
            height: 100%;
            background-color: rgba(13, 110, 253, 0.3);
        }
        .range-label {
            position: absolute;
            top: -20px;
            font-size: 0.8rem;
            font-weight: 600;
        }