:root {
            --primary-color: #38b57a;
            --primary-dark: #2d925f;
            --primary-light: #7fd4a8;
            --secondary-color: #3498db;
            --secondary-dark: #2980b9;
            --secondary-light: #5faee3;
            --white: #ffffff;
            --gray-light: #f4f6f9;
            --gray: #e0e0e0;
            --dark: #333333;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f9fafb;
            color: var(--dark);
            line-height: 1.6;
            overflow-x: hidden;
        }
        
        .title-gradient {
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        
        .header-wave {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            overflow: hidden;
            line-height: 0;
            z-index: -1;
        }
        
        .card {
            background: white;
            border-radius: 16px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
        }
        
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.12);
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: white;
            transition: all 0.3s ease;
        }
        
        .btn-primary:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
        }
        
        .btn-secondary {
            background-color: var(--secondary-color);
            color: white;
            transition: all 0.3s ease;
        }
        
        .btn-secondary:hover {
            background-color: var(--secondary-dark);
            transform: translateY(-2px);
        }
        
        .toggle-checkbox:checked {
            @apply: right-0 border-green-400;
            right: 0;
            border-color: var(--primary-color);
        }
        
        .toggle-checkbox:checked + .toggle-label {
            @apply: bg-green-400;
            background-color: var(--primary-color);
        }
        
        .animated-bg {
            background: linear-gradient(-45deg, var(--primary-light), var(--primary-color), var(--secondary-color), var(--secondary-light));
            background-size: 400% 400%;
            animation: gradient 15s ease infinite;
        }
        
        @keyframes gradient {
            0% {
                background-position: 0% 50%;
            }
            50% {
                background-position: 100% 50%;
            }
            100% {
                background-position: 0% 50%;
            }
        }
        
        .pulse {
            animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }
        
        @keyframes pulse {
            0%, 100% {
                opacity: 1;
            }
            50% {
                opacity: 0.7;
            }
        }
        
        /* Chart Styles */
        .chart-container {
            position: relative;
            margin: auto;
            height: 200px;
            width: 100%;
        }
        
        .chart-bar {
            position: absolute;
            bottom: 0;
            width: 18%;
            background: linear-gradient(to top, var(--primary-color), var(--primary-light));
            border-radius: 8px 8px 0 0;
            transition: height 1s ease-in-out;
        }
        
        .chart-bar.underweight {
            left: 10%;
            height: 30%;
            background: linear-gradient(to top, #ffc107, #ffe082);
        }
        
        .chart-bar.normal {
            left: 30%;
            height: 80%;
        }
        
        .chart-bar.overweight {
            left: 50%;
            height: 50%;
            background: linear-gradient(to top, #ff9800, #ffcc80);
        }
        
        .chart-bar.obese {
            left: 70%;
            height: 40%;
            background: linear-gradient(to top, #f44336, #e57373);
        }
        
        .chart-label {
            position: absolute;
            bottom: -30px;
            text-align: center;
            font-size: 12px;
            width: 18%;
            color: var(--dark);
        }
        
        /* Tooltip styles */
        .tooltip {
            position: relative;
            display: inline-block;
        }
        
        .tooltip .tooltiptext {
            visibility: hidden;
            width: 200px;
            background-color: rgba(0,0,0,0.8);
            color: #fff;
            text-align: center;
            border-radius: 6px;
            padding: 10px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            transform: translateX(-50%);
            opacity: 0;
            transition: opacity 0.3s;
        }
        
        .tooltip:hover .tooltiptext {
            visibility: visible;
            opacity: 1;
        }
        
        /* Form input focus state */
        input:focus, select:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(56, 181, 122, 0.2);
        }
        
        /* Result animation */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .fade-in {
            animation: fadeIn 0.5s ease-out forwards;
        }
        
        /* SVG Background Animation */
        .rotate-slow {
            animation: rotateAnimation 30s linear infinite;
        }
        
        @keyframes rotateAnimation {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }