:root { 
            --accent-color: #1d3557;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --success-color: #2a9d8f;
            --warning-color: #e9c46a;
            --strength-color: #e63946;
            --training-color: #457b9d;
        }
         .page-header {
            background: linear-gradient(135deg, rgba(168, 218, 220, 0.4) 0%, rgba(230, 57, 70, 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);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.15);
        }
        .strength-card {
            padding: 12px;
            background-color: white;
            border-radius: 4px;
            border: 1px solid #eee;
            font-size: 1.1rem;
            margin: 10px 0;
            text-align: center;
        }
        .max-result {
            font-size: 1.5rem;
            padding: 15px;
            background-color: rgba(230, 57, 70, 0.05);
            border-left: 4px solid var(--strength-color);
            border-radius: 4px;
            margin: 15px 0;
            font-weight: 700;
        }
        .training-box {
            background-color: rgba(69, 123, 157, 0.05);
            border-left: 3px solid var(--training-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            }
        .training-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;
        }
        .example-btn:hover {
            background-color: rgba(230, 57, 70, 0.2);
            transform: translateY(-2px);
        }
        .strength-level {
            padding: 8px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            display: inline-block;
            margin: 0 5px;
        }
        .beginner {
            background-color: rgba(42, 157, 143, 0.2);
            color: #2a9d8f;
        }
        .novice {
            background-color: rgba(42, 157, 143, 0.3);
            color: #2a9d8f;
        }
        .intermediate {
            background-color: rgba(233, 196, 106, 0.3);
            color: #e9c46a;
        }
        .advanced {
            background-color: rgba(230, 57, 70, 0.3);
            color: var(--primary-color);
        }
        .elite {
            background-color: rgba(29, 53, 87, 0.3);
            color: var(--accent-color);
        }
        .calculation-step {
            margin-bottom: 1.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px dashed var(--border-color);
        }
        .training-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        .training-table th, .training-table td {
            padding: 0.75rem;
            text-align: center;
            border: 1px solid var(--border-color);
        }
        .training-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        .training-table tr:nth-child(even) {
            background-color: rgba(230, 57, 70, 0.05);
        }
        .weight-visualization {
            display: flex;
            align-items: center;
            margin: 1rem 0;
            padding: 1rem;
            background-color: rgba(255,255,255,0.8);
            border-radius: 6px;
            border: 1px solid var(--border-color);
        }
        .weight-value {
            font-family: 'Courier New', monospace;
            background-color: rgba(230, 57, 70, 0.1);
            padding: 0.5rem;
            border-radius: 4px;
            margin: 0 0.5rem;
        }
        .weight-label {
            font-weight: 600;
            margin-right: 0.5rem;
        }
        .graph-legend {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin-top: 1rem;
        }
        .legend-item {
            display: flex;
            align-items: center;
        }
        .legend-color {
            width: 20px;
            height: 4px;
            margin-right: 0.5rem;
        }
        .max-color {
            background-color: rgba(230, 57, 70, 0.8);
        }
        .training-color {
            background-color: rgba(69, 123, 157, 0.8);
        }
        .progress-tracker {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            margin-bottom: 1.5rem;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        .progress-bar-custom {
            height: 20px;
            border-radius: 10px;
            background-color: #e9ecef;
            overflow: hidden;
        }
        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--primary-color), #f4a261);
            transition: width 0.5s ease;
        }
        .plan-card {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1rem;
            transition: all 0.3s;
        }
        .plan-card:hover {
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            transform: translateY(-3px);
        }
        .plan-card.selected {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.1);
        }
        .plan-title {
            font-weight: 600;
            color: var(--accent-color);
            margin-bottom: 0.5rem;
        }
        .unit-selector {
            display: flex;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            overflow: hidden;
            width: fit-content;
        }
        .unit-option {
            padding: 0.5rem 1rem;
            cursor: pointer;
            transition: all 0.2s;
            font-weight: 500;
        }
        .unit-option.selected {
            background-color: var(--primary-color);
            color: white;
        }
        .unit-option:not(.selected):hover {
            background-color: var(--light-gray);
        }
    
        .rep-value-display {
            text-align: center;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color); 
        }
        .rep-slider {
            width: 100%;
            height: 6px;
            -webkit-appearance: none;
            appearance: none;
            background: #ddd;
            border-radius: 3px;
            outline: none;
        }
        .rep-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--primary-color);
            cursor: pointer;
            border: 3px solid white;
            box-shadow: 0 2px 5px rgba(0,0,0,0.2);
        }
        .gender-selector {
            display: flex;
            gap: 1rem;
        }
        .gender-option {
            flex: 1;
            text-align: center;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            padding: 1rem;
            cursor: pointer;
            transition: all 0.2s;
        }
        .gender-option.selected {
            border-color: var(--primary-color);
            background-color: rgba(230, 57, 70, 0.05);
        }
        .gender-icon {
            font-size: 2rem;
            margin-bottom: 0.5rem;
            display: block;
        }
        .unit-toggle-container {
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 1rem 0;
        }
        .unit-toggle-label {
            margin: 0 1rem;
            font-weight: 600;
        }
        .unit-toggle-switch {
            position: relative;
            display: inline-block;
            width: 60px;
            height: 34px;
        }
        .unit-toggle-switch input {
            opacity: 0;
            width: 0;
            height: 0;
        }
        .unit-toggle-slider {
            position: absolute;
            cursor: pointer;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: var(--secondary-color);
            transition: .4s;
            border-radius: 34px;
        }
        .unit-toggle-slider:before {
            position: absolute;
            content: "";
            height: 26px;
            width: 26px;
            left: 4px;
            bottom: 4px;
            background-color: white;
            transition: .4s;
            border-radius: 50%;
        }
        input:checked + .unit-toggle-slider {
            background-color: var(--primary-color);
        }
        input:checked + .unit-toggle-slider:before {
            transform: translateX(26px);
        }
        .metric-indicator {
            display: inline-block;
            padding: 2px 8px;
            background-color: #e9ecef;
            border-radius: 4px;
            font-size: 0.8rem;
            margin-left: 5px;
            color: var(--text-muted);
        }