:root {
            --primary-color: #2c7da0;
            --secondary-color: #a9d6e5;
            --accent-color: #01497c;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --imperial-color: #2c7da0;
            --metric-color: #6f42c1;
        }
        .page-header {
            background: linear-gradient(135deg, rgba(169, 214, 229, 0.15) 0%, rgba(44, 125, 160, 0.15) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(44, 125, 160, 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);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(44, 125, 160, 0.15);
        }
        .conversion-display {
            background: linear-gradient(135deg, rgba(169, 214, 229, 0.1) 0%, rgba(111, 66, 193, 0.1) 100%);
            border-radius: 8px;
            padding: 1.5rem;
            margin-top: 1.5rem;
            text-align: center;
            border: 1px solid rgba(44, 125, 160, 0.2);
        }
        .conversion-formula {
            font-size: 1rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }
        .conversion-result {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            margin: 0.5rem 0;
        }
        .conversion-detail {
            font-size: 1.1rem;
            color: var(--text-color);
            margin-top: 1rem;
        }
        .unit-badge {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.9rem;
            margin: 0 0.25rem;
        }
        .imperial-badge {
            background-color: rgba(44, 125, 160, 0.1);
            color: var(--imperial-color);
            border: 1px solid rgba(44, 125, 160, 0.2);
        }
        .metric-badge {
            background-color: rgba(111, 66, 193, 0.1);
            color: var(--metric-color);
            border: 1px solid rgba(111, 66, 193, 0.2);
        }
        .visualization-container {
            margin-top: 2rem;
            padding: 1.5rem;
            background-color: var(--light-gray);
            border-radius: 8px;
            border: 1px solid var(--border-color);
        }
        .comparison-bar {
            display: flex;
            height: 60px;
            margin: 1.5rem 0;
            border-radius: 4px;
            overflow: hidden;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        .imperial-bar {
            background-color: var(--imperial-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
        }
        .metric-bar {
            background-color: var(--metric-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
        }
        .feet-inches-input {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }
        .feet-input, .inches-input {
            flex: 1;
        }
        .conversion-table-container {
            overflow-x: auto;
        }
        .conversion-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        .conversion-table th, .conversion-table td {
            padding: 0.75rem;
            text-align: center;
            border: 1px solid var(--border-color);
        }
        .conversion-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        .conversion-table tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }
        .conversion-table .highlight {
            background-color: rgba(44, 125, 160, 0.15);
            font-weight: 600;
        }
        .quick-conversions {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .quick-conversion-item {
            background-color: white;
            border-radius: 6px;
            padding: 1rem;
            text-align: center;
            border: 1px solid var(--border-color);
            transition: all 0.3s;
            cursor: pointer;
        }
        .quick-conversion-item:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            border-color: var(--primary-color);
        }
        .quick-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 0.25rem;
        }
        .quick-label {
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .common-lengths {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .length-item {
            background-color: white;
            border-radius: 6px;
            padding: 1rem;
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
        }
        .length-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: rgba(44, 125, 160, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            color: var(--primary-color);
        }
        .length-value {
            font-weight: 600;
            color: var(--text-color);
        }
        .length-description {
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .math-box {
            background-color: rgba(111, 66, 193, 0.05);
            border-left: 3px solid var(--metric-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            .conversion-result {
                font-size: 2rem;
            }
            .quick-conversions {
                grid-template-columns: repeat(2, 1fr);
            }
            .feet-inches-input {
                flex-direction: column;
                gap: 0.5rem;
            }
        }
        .conversion-direction {
            display: flex;
            justify-content: center;
            margin: 1.5rem 0;
        }
        .direction-toggle {
            display: flex;
            align-items: center;
            background-color: var(--light-gray);
            border-radius: 50px;
            padding: 0.25rem;
            border: 1px solid var(--border-color);
        }
        .direction-option {
            padding: 0.5rem 1.5rem;
            border-radius: 50px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s;
        }
        .direction-option.active {
            background-color: var(--primary-color);
            color: white;
        }
        .tooltip-text {
            position: relative;
            display: inline-block;
            cursor: help;
            border-bottom: 1px dotted var(--text-muted);
        }
        .tooltip-text .tooltip-content {
            visibility: hidden;
            width: 200px;
            background-color: var(--text-color);
            color: white;
            text-align: center;
            border-radius: 6px;
            padding: 5px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            margin-left: -100px;
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.9rem;
            font-weight: normal;
        }
        .tooltip-text:hover .tooltip-content {
            visibility: visible;
            opacity: 1;
        }