: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;
            --math-color: #6f42c1;
            --calc-color: #e83e8c;
            --grade-color: #28a745;
        }
      .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: 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);
        }
        .grade-result {
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: white;
            border-radius: 8px;
            padding: 2rem;
            margin: 1rem 0;
            border: 2px dashed var(--primary-color);
        }
        .grade-letter {
            font-size: 5rem;
            font-weight: 700;
            color: var(--accent-color);
            line-height: 1;
        }
        .grade-points {
            font-size: 1.5rem;
            color: var(--text-muted);
            margin-left: 1rem;
        }
        .grade-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        .grade-table th, .grade-table td {
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            text-align: center;
        }
        .grade-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        .grade-table tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }
        .current-grade-row {
            background-color: rgba(40, 167, 69, 0.2) !important;
            font-weight: 600;
        }
        .example-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .example-badge {
            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;
        }
        .example-badge:hover {
            background-color: rgba(44, 125, 160, 0.2);
            transform: translateY(-2px);
        }
        .slider-container {
            margin: 2rem 0;
        }
        .form-range {
            width: 100%;
        }
        .math-box {
            background-color: rgba(111, 66, 193, 0.05);
            border-left: 3px solid var(--math-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            }