:root {
            --primary: #00a231;
            --primary-light: #8d9f87;
            --secondary: #ff914d;
            --accent: #c5d5ea;
            --light: #f8f9fa;
            --dark: #333;
            --grey: #6c757d;
            --border-radius: 12px;
            --box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
.pet-age-calculator-container {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--dark);
    background: transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
        .container {
            width: 100%;
            max-width: 1140px;
            margin: 0 auto;
            background: transparent !important;
        }

        .calculator-card {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
            margin-bottom: 30px;
        }

        .card-header {
            background: var(--primary);
            color: white;
            padding: 20px;
            text-align: center;
            font-size: 1.5rem;
        }

        .card-body {
            padding: 30px;
        }

        .form-section {
            margin-bottom: 25px;
        }

        .section-title {
            font-size: 1.2rem;
            color: var(--primary);
            margin-bottom: 15px;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--accent);
            display: flex;
            align-items: center;
        }

        .section-title i {
            margin-right: 10px;
            width: 24px;
            text-align: center;
        }

        .pet-type-selector {
            display: flex;
            gap: 20px;
            margin-bottom: 20px;
        }

        .pet-type {
            flex: 1;
            text-align: center;
            cursor: pointer;
            padding: 20px;
            border: 2px solid #e9ecef;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }

        .pet-type:hover {
            border-color: var(--primary-light);
            transform: translateY(-5px);
        }

        .pet-type.selected {
            border-color: var(--primary);
            background-color: rgba(74, 124, 89, 0.05);
            position: relative;
        }

        .pet-type.selected::after {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            border: 2px solid var(--primary);
            border-radius: var(--border-radius);
            pointer-events: none;
        }

        .pet-type i {
            font-size: 2.5rem;
            color: var(--primary-light);
            margin-bottom: 10px;
            display: block;
        }

        .pet-type.selected i {
            color: var(--primary);
        }

        .pet-type h3 {
            color: var(--dark);
            margin-bottom: 5px;
        }

        .size-selector {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
            margin-top: 15px;
        }

        .size-option {
            padding: 15px;
            border: 2px solid #e9ecef;
            border-radius: var(--border-radius);
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .size-option:hover {
            border-color: var(--primary-light);
        }

        .size-option.selected {
            border-color: var(--primary);
            background-color: rgba(74, 124, 89, 0.05);
        }

        .size-option i {
            font-size: 2rem;
            color: var(--primary-light);
            margin-bottom: 8px;
            display: block;
        }

        .size-option.selected i {
            color: var(--primary);
        }

        .size-option h4 {
            color: var(--dark);
            margin-bottom: 5px;
        }

        .size-option p {
            color: var(--grey);
            font-size: 0.9rem;
        }

        .age-tabs {
            display: flex;
            border-bottom: 2px solid #e9ecef;
            margin-bottom: 20px;
        }

        .age-tab {
            padding: 12px 20px;
            cursor: pointer;
            font-weight: 600;
            color: var(--grey);
            border-bottom: 3px solid transparent;
            transition: var(--transition);
        }

        .age-tab.active {
            color: var(--primary);
            border-bottom: 3px solid var(--primary);
        }

        .age-inputs {
            display: flex;
            gap: 20px;
        }

        .input-group {
            flex: 1;
        }

        .input-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }

        .input-container {
            position: relative;
        }

        .input-container input {
            width: 100%;
            padding: 15px;
            border: 2px solid #e9ecef;
            border-radius: var(--border-radius);
            font-size: 1.1rem;
            transition: var(--transition);
        }

        .input-container input:focus {
            border-color: var(--primary);
            outline: none;
        }

        .calculate-btn {
            display: block;
            width: 100%;
            padding: 16px;
            background: var(--secondary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-size: 1.2rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            margin-top: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .calculate-btn:hover {
            background: #ff7a3d;
            transform: translateY(-2px);
        }

        .recalculate-btn {
            display: inline-block;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            margin-top: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin: 20px auto 0;
        }

        .recalculate-btn:hover {
            background: #3a6045;
            transform: translateY(-2px);
        }

        .results-container {
            background: var(--light);
            border-radius: var(--border-radius);
            padding: 25px;
            margin-top: 30px;
            text-align: center;
            display: none;
        }

        .results-container.visible {
            display: block;
            animation: fadeIn 0.5s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .results-title {
            color: var(--primary);
            margin-bottom: 20px;
            font-size: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .results-title i {
            font-size: 1.8rem;
        }

        .human-age {
            font-size: 3rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .human-age i {
            font-size: 2.5rem;
        }

        .life-stage {
            font-size: 1.3rem;
            color: var(--primary);
            margin-bottom: 20px;
            padding: 10px;
            background: rgba(74, 124, 89, 0.1);
            border-radius: var(--border-radius);
            display: inline-block;
        }

        .result-description {
            color: var(--grey);
            margin-top: 15px;
            line-height: 1.6;
        }

        .info-box {
            background: #e8f4f8;
            border-left: 4px solid #3498db;
            padding: 15px;
            border-radius: 4px;
            margin-top: 25px;
            text-align: left;
        }

        .info-box p {
            margin-bottom: 10px;
            color: #2c3e50;
        }

        .info-box i {
            color: #3498db;
            margin-right: 8px;
        }

        .error-message {
            color: #e74c3c;
            font-size: 0.9rem;
            margin-top: 5px;
            display: none;
        }

        footer {
            text-align: center;
            color: var(--grey);
            margin-top: 30px;
            font-size: 0.9rem;
        }

        @media (max-width: 768px) {
            .pet-type-selector {
                flex-direction: column;
            }
            
            .age-inputs {
                flex-direction: column;
                gap: 15px;
            }
            
            .size-selector {
                grid-template-columns: repeat(2, 1fr);
                 gap: 10px;
            }
            
            .human-age {
                flex-direction: column;
                gap: 5px;
            }
        }