:root { 
            --accent-color: #c1121f;
            --hex-color: #e63946;
            --binary-color: #f4a261;
            --octal-color: #8a4baf;
            --decimal-color: #2a9d8f;
            --float-color: #4a6fa5;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --success-color: #28a745;
            --warning-color: #ffc107;
        }
        .page-header {
         background: linear-gradient(135deg, rgba(157, 78, 221, 0.1) 0%, rgba(44, 125, 160, 0.4) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(230, 57, 70, 0.2);
            position: relative;
            overflow: hidden;    color: var(--text-color);
        }
        .breadcrumb {
            background-color: transparent;
            padding: 0.5rem 0;
            margin-bottom: 0.5rem;
        }
        .breadcrumb-item a {
            color: var(--text-muted);
            text-decoration: none;
        }
        .breadcrumb-item.active {
            color: var(--text-color);
        }
        .nav-tabs {
            border-bottom: 2px solid var(--border-color);
            margin-bottom: 1.5rem;
        }
        .nav-tabs .nav-tabs .nav-tabs .nav-link:hover:not(.active) {
            color: var(--primary-color);
            background-color: rgba(230, 57, 70, 0.05);
        }
     
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.15);
        }
        textarea.conversion-result {
            padding: 15px;
            background-color: white;
            border-radius: 4px;
            border: 1px solid #eee;
            font-size: 1.3rem;
            font-family: 'Courier New', monospace;
            margin: 10px 0;
            text-align: center;
        }
        .hex-display {
            color: var(--hex-color);
            font-weight: 700;
        }
        .binary-display {
            color: var(--binary-color);
            font-weight: 700;
        }
        .octal-display {
            color: var(--octal-color);
            font-weight: 700;
        }
        .decimal-display {
            color: var(--decimal-color);
            font-weight: 700;
        }
        .float-display {
            color: var(--float-color);
            font-weight: 700;
        }
        .batch-results-container {
            overflow-x: auto;
            margin: 1.5rem 0;
        }
        .batch-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
        }
        .batch-table th {
            background-color: var(--light-gray);
            padding: 1rem;
            text-align: left;
            border-bottom: 2px solid var(--border-color);
            font-weight: 600;
            color: var(--text-color);
            position: sticky;
            top: 0;
        }
        .batch-table td {
            padding: 0.75rem 1rem;
            border-bottom: 1px solid var(--border-color);
            vertical-align: top;
        }
        .batch-table tr:hover {
            background-color: rgba(230, 57, 70, 0.05);
        }
        .batch-table .hex-cell {
            font-family: 'Courier New', monospace;
            color: var(--hex-color);
            font-weight: 600;
        }
        .batch-table .binary-cell {
            font-family: 'Courier New', monospace;
            color: var(--binary-color);
            font-weight: 600;
        }
        .batch-table .decimal-cell {
            font-family: 'Courier New', monospace;
            color: var(--decimal-color);
            font-size: 0.9rem;
        }
        .batch-table .error-cell {
            color: #dc3545;
            font-weight: 600;
        }
        .batch-controls {
            display: flex;
            justify-content: space-between;
            margin-bottom: 1rem;
        }
        .batch-actions {
            display: flex;
            gap: 0.5rem;
        }
        .batch-info {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .hex-box {
            background-color: rgba(230, 57, 70, 0.05);
            border-left: 3px solid var(--hex-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .binary-box {
            background-color: rgba(244, 162, 97, 0.05);
            border-left: 3px solid var(--binary-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .float-box {
            background-color: rgba(74, 111, 165, 0.05);
            border-left: 3px solid var(--float-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            .batch-controls {
                flex-direction: column;
                gap: 1rem;
            }
        }
        .hex-examples {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .example-btn {
            background-color: rgba(230, 57, 70, 0.1);
            border: 1px solid rgba(230, 57, 70, 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(230, 57, 70, 0.2);
            transform: translateY(-2px);
        }
        .calculation-step {
            margin-bottom: 1.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px dashed var(--border-color);
        }
        .step-calculation {
            font-family: 'Courier New', monospace;
            background-color: rgba(255, 255, 255, 0.8);
            padding: 1rem;
            border-radius: 6px;
            border: 1px solid var(--border-color);
            margin: 1rem 0;
        }
        .calculation-line {
            margin: 0.5rem 0;
        }
        .calculation-result {
            font-weight: 700;
            color: var(--success-color);
            margin-left: 0.5rem;
        }
        .number-system {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .system-card {
            flex: 1;
            min-width: 200px;
            background: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            text-align: center;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        .system-title {
            font-weight: 600;
            font-size: 1.2rem;
            margin-bottom: 0.5rem;
        }
        .system-base {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 1rem;
        }
        .system-example {
            font-family: 'Courier New', monospace;
            font-size: 1.1rem;
            padding: 0.5rem;
            background-color: var(--light-gray);
            border-radius: 4px;
        }
        .hex-digit-0 { color: #6c757d; }
        .hex-digit-1 { color: #007bff; }
        .hex-digit-2 { color: #28a745; }
        .hex-digit-3 { color: #ffc107; }
        .hex-digit-4 { color: #17a2b8; }
        .hex-digit-5 { color: #e83e8c; }
        .hex-digit-6 { color: #fd7e14; }
        .hex-digit-7 { color: #20c997; }
        .hex-digit-8 { color: #6f42c1; }
        .hex-digit-9 { color: #343a40; }
        .hex-digit-A { color: #dc3545; }
        .hex-digit-B { color: #20c997; }
        .hex-digit-C { color: #ffc107; }
        .hex-digit-D { color: #17a2b8; }
        .hex-digit-E { color: #e83e8c; }
        .hex-digit-F { color: #6f42c1; }
        .hex-digit-a { color: #dc3545; }
        .hex-digit-b { color: #20c997; }
        .hex-digit-c { color: #ffc107; }
        .hex-digit-d { color: #17a2b8; }
        .hex-digit-e { color: #e83e8c; }
        .hex-digit-f { color: #6f42c1; }
        .batch-examples {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            margin: 1rem 0;
        }
        .batch-example {
            background-color: rgba(230, 57, 70, 0.05);
            border: 1px solid rgba(230, 57, 70, 0.1);
            border-radius: 6px;
            padding: 1rem;
            cursor: pointer;
            transition: all 0.2s;
        }
        .batch-example:hover {
            background-color: rgba(230, 57, 70, 0.1);
            transform: translateY(-2px);
        }
        .batch-example-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        .batch-example-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
        }
        .batch-example-content {
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
            background-color: rgba(255, 255, 255, 0.8);
            padding: 0.75rem;
            border-radius: 4px;
            border: 1px solid var(--border-color);
            overflow-x: auto;
            white-space: pre;
        }
        .empty-state {
            text-align: center;
            padding: 3rem 1rem;
            color: var(--text-muted);
        }
        .empty-state i {
            font-size: 3rem;
            margin-bottom: 1rem;
            opacity: 0.5;
        }
        .export-buttons {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }
        .hex-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        .hex-table th, .hex-table td {
            padding: 0.75rem;
            text-align: center;
            border: 1px solid var(--border-color);
        }
        .hex-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        .hex-table tr:nth-child(even) {
            background-color: rgba(230, 57, 70, 0.05);
        }
        .hex-digit-display {
            font-family: 'Courier New', monospace;
            font-weight: 700;
            color: var(--hex-color);
        }
        .binary-value {
            font-family: 'Courier New', monospace;
            color: var(--binary-color);
        }
        .social-icons {
            display: flex;
            gap: 0.75rem;
            margin-top: 1rem;
        }
        .social-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background-color: rgba(230, 57, 70, 0.1);
            border-radius: 50%;
            color: var(--primary-color);
            text-decoration: none;
            transition: all 0.3s;
        }
        .social-icon:hover {
            background-color: var(--primary-color);
            color: white;
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(230, 57, 70, 0.1);
            color: var(--primary-color);
        }
        .accordion-button:focus {
            box-shadow: 0 0 0 0.25rem rgba(230, 57, 70, 0.25);
        }
        .precision-controls {
            background-color: rgba(74, 111, 165, 0.05);
            border-radius: 6px;
            padding: 1rem;
            margin: 1rem 0;
            border: 1px solid rgba(74, 111, 165, 0.1);
        }
        .precision-slider {
            width: 100%;
            margin: 0.5rem 0;
        }
        .precision-value {
            font-weight: bold;
            color: var(--float-color);
        }
        .float-indicator {
            display: inline-block;
            padding: 0.25rem 0.5rem;
            background-color: var(--float-color);
            color: white;
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-left: 0.5rem;
        }
        .bit-grouping {
            font-family: 'Courier New', monospace;
            display: inline-block;
            margin: 0 0.25rem;
            padding: 0.1rem 0.3rem;
            border-radius: 3px;
            background-color: rgba(244, 162, 97, 0.1);
        }
        .twos-complement {
            display: inline-block;
            padding: 0.25rem 0.5rem;
            background-color: rgba(230, 57, 70, 0.1);
            color: var(--hex-color);
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-left: 0.5rem;
        }
        .case-toggle {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            margin-top: 0.5rem;
        }
        .bit-length-indicator {
            display: inline-block;
            padding: 0.25rem 0.5rem;
            background-color: rgba(244, 162, 97, 0.1);
            color: var(--binary-color);
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-left: 0.5rem;
        }