:root {
            --primary-color: #2c7da0;
            --secondary-color: #a9d6e5;
            --accent-color: #01497c;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --header-bg: #f0f4f8;
            --healthy-color: #28a745;
            --underweight-color: #17a2b8;
            --overweight-color: #ffc107;
            --obese-color: #dc3545;
        }
         
        .water-result {
            text-align: center;
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 1.5rem;
            background-color: #f8f9fa;
            border: 1px solid #eaeaea;
        }
        
        .water-value {
            font-size: 3.5rem;
            font-weight: 700;
            margin: 0.5rem 0;
            color: var(--primary-color);
        }
        
        .water-unit {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }
        
        .water-cups {
            font-size: 1.25rem;
            margin-bottom: 1rem;
            color: var(--text-muted);
        }
        
        .hydration-chart {
            height: 40px;
            background: linear-gradient(90deg, 
                #dc3545 0%, 
                #dc3545 33%,
                #ffc107 33%,
                #ffc107 66%,
                #28a745 66%,
                #28a745 100%);
            border-radius: 20px;
            margin: 1rem 0;
            position: relative;
        }
        
        .hydration-marker {
            position: absolute;
            top: -10px;
            width: 4px;
            height: 60px;
            background-color: #000;
            transform: translateX(-50%);
        }
        
        .hydration-marker-label {
            position: absolute;
            top: -35px;
            left: 50%;
            transform: translateX(-50%);
            font-size: 0.85rem;
            font-weight: 600;
            white-space: nowrap;
        }
        
        .hydration-labels {
            display: flex;
            justify-content: space-between;
            margin-top: 0.5rem;
            font-size: 0.85rem;
        }
        
        .hydration-label-item {
            text-align: center;
            flex: 1;
        }
        
        .health-recommendations {
            background-color: rgba(40, 167, 69, 0.05);
            border-left: 3px solid var(--healthy-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        
        .recommendation-list {
            padding-left: 1.5rem;
        }
        
        .recommendation-list li {
            margin-bottom: 0.75rem;
        }
        
        .personalized-note {
            background-color: rgba(44, 125, 160, 0.05);
            padding: 1rem;
            border-radius: 6px;
            margin: 1rem 0;
            border-left: 3px solid var(--primary-color);
        }
        
        .unit-toggle {
            display: flex;
            margin-bottom: 1rem;
            border: 1px solid #ddd;
            border-radius: 6px;
            overflow: hidden;
        }
        
        .unit-btn {
            flex: 1;
            padding: 0.75rem;
            background: white;
            border: none;
            cursor: pointer;
            text-align: center;
            font-weight: 500;
            transition: all 0.3s;
        }
        
        .unit-btn.active {
            background-color: var(--primary-color);
            color: white;
        }
        
        .unit-btn:not(:last-child) {
            border-right: 1px solid #ddd;
        }
        
        .input-group-unit {
            position: relative;
        }
        
        .unit-label {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
        }
        
        .gender-selection {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }
        
        .gender-btn {
            flex: 1;
            padding: 1rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            background: white;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .gender-btn:hover {
            border-color: var(--primary-color);
        }
        
        .gender-btn.active {
            border-color: var(--primary-color);
            background-color: rgba(44, 125, 160, 0.1);
        }
        
        .gender-icon {
            font-size: 2rem;
            margin-bottom: 0.5rem;
        }
        
        .gender-label {
            font-weight: 500;
        }
        
        .activity-level {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }
        
        .activity-btn {
            flex: 1;
            min-width: 120px;
            padding: 1rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            background: white;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .activity-btn:hover {
            border-color: var(--primary-color);
        }
        
        .activity-btn.active {
            border-color: var(--primary-color);
            background-color: rgba(44, 125, 160, 0.1);
        }
        
        .activity-icon {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        
        .activity-label {
            font-weight: 500;
        }
        
        .climate-selection {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }
        
        .climate-btn {
            flex: 1;
            padding: 1rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            background: white;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .climate-btn:hover {
            border-color: var(--primary-color);
        }
        
        .climate-btn.active {
            border-color: var(--primary-color);
            background-color: rgba(44, 125, 160, 0.1);
        }
        
        .climate-icon {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        
        .climate-label {
            font-weight: 500;
        }
          
        
        .hydration-tips {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin: 1.5rem 0;
        }
        
        .tip-card {
            flex: 1;
            min-width: 200px;
            background-color: rgba(169, 214, 229, 0.2);
            border-radius: 8px;
            padding: 1rem;
            border-left: 3px solid var(--primary-color);
        }
        
        .tip-icon {
            font-size: 1.5rem;
            color: var(--primary-color);
            margin-bottom: 0.75rem;
        }
        
        @media (max-width: 991px) {
            .tool-container {
                flex-direction: column;
            }
            
            .tool-sidebar {
                width: 100%;
            }
        }
      .info-section {
            background-color: rgba(52, 152, 219, 0.05);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-left: 3px solid var(--primary-color);
        }
        
        .info-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        
        .image-card {
            border-radius: 8px;
            overflow: hidden;
            margin: 1.5rem 0;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            border: 1px solid var(--border-color);
        }
        
        .image-card img {
            width: 100%;
            height: 250px;
            object-fit: cover;
        }
        
        .image-card-content {
            padding: 1rem;
            background: white;
        }
        
        .image-card-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        
        .image-card-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        .image-attribution {
            font-size: 0.7rem;
            color: var(--text-muted);
            text-align: right;
            padding: 0.5rem;
            background-color: var(--light-gray);
        }
        
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        
        .feature-card {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .feature-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        .feature-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        
        .feature-desc {
            color: var(--text-muted);
        }
        
        .testimonial-section {
            background-color: rgba(169, 214, 229, 0.2);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-left: 3px solid var(--primary-color);
        }
        
        .testimonial {
            display: flex;
            align-items: center;
            margin-bottom: 1.5rem;
        }
        
        .testimonial:last-child {
            margin-bottom: 0;
        }
        
        .testimonial-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            margin-right: 1rem;
            border: 3px solid var(--primary-color);
        }
        
        .testimonial-content {
            flex: 1;
        }
        
        .testimonial-text {
            font-style: italic;
            margin-bottom: 0.5rem;
        }
        
        .testimonial-author {
            font-weight: 600;
            color: var(--primary-color);
        }
        
        .testimonial-role {
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        
        .stat-card {
            background-color: white;
            border-radius: 8px;
            padding: 1rem;
            text-align: center;
            border: 1px solid var(--border-color);
        }
        
        .stat-value {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        
        .comparison-table th, .comparison-table td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        
        .comparison-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        
        .comparison-table tr:hover {
            background-color: rgba(52, 152, 219, 0.05);
        }
        
         .hydration-tips {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        
        .tip-item {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            text-align: center;
        }
        
        .tip-icon {
            font-size: 2rem;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        
        .tip-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        
        .tip-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        .water-benefits {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        
        .benefit-card {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            text-align: center;
        }
        
        .benefit-icon {
            font-size: 2rem;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        
        .benefit-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        
        .benefit-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        .dehydration-symptoms {
            background-color: rgba(243, 156, 18, 0.1);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-left: 3px solid var(--warning-orange);
        }
        
        .symptoms-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--warning-orange);
        }
        
        @media (max-width: 768px) {
            .feature-grid {
                grid-template-columns: 1fr;
            }
            
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .testimonial {
                flex-direction: column;
                text-align: center;
            }
            
            .testimonial-avatar {
                margin-right: 0;
                margin-bottom: 1rem;
            }
        }