:root {
            --primary-color: #4CAF50;
            --primary-light: #80e27e;
            --primary-dark: #087f23;
            --secondary-color: #1976D2;
            --secondary-light: #63a4ff;
            --secondary-dark: #004ba0;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f8f9fa;
            color: #333;
            position: relative;
            overflow-x: hidden;
        }
        
        .bg-vector {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            opacity: 0.05;
            z-index: -1;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%234CAF50' fill-opacity='0.8' d='M0,64L48,80C96,96,192,128,288,133.3C384,139,480,117,576,117.3C672,117,768,139,864,170.7C960,203,1056,245,1152,234.7C1248,224,1344,160,1392,128L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-size: cover;
        }

        .header-bg {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            height: 300px;
            border-radius: 0 0 30px 30px;
            position: relative;
            overflow: hidden;
        }
        
        .header-bg::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23ffffff' fill-opacity='0.1' d='M0,160L48,149.3C96,139,192,117,288,122.7C384,128,480,160,576,186.7C672,213,768,235,864,224C960,213,1056,171,1152,149.3C1248,128,1344,128,1392,128L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-size: cover;
        }
        
        .calculator-card {
            background: white;
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
        }
        
        .calculator-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 12px 24px;
            border-radius: 50px;
            color: white;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 4px 6px rgba(76, 175, 80, 0.3);
        }
        
        .btn-primary:hover {
            background-color: var(--primary-dark);
            box-shadow: 0 6px 8px rgba(76, 175, 80, 0.4);
            transform: translateY(-2px);
        }
        
        .input-field {
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            padding: 12px 15px;
            transition: all 0.3s ease;
        }
        
        .input-field:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.2);
            outline: none;
        }
        
        .bmi-chart-container {
            position: relative;
            height: 280px;
            margin: 20px auto;
        }
        
        .bmi-meter {
            width: 100%;
            height: 20px;
            background: linear-gradient(to right, #3f51b5, #4CAF50, #FFEB3B, #FF9800, #f44336);
            border-radius: 10px;
            position: relative;
            margin-top: 30px;
        }
        
        .bmi-pointer {
            position: absolute;
            bottom: 100%;
            width: 0;
            height: 0;
            border-left: 10px solid transparent;
            border-right: 10px solid transparent;
            border-top: 15px solid #333;
            transform: translateX(-50%);
            transition: left 1s cubic-bezier(0.68, -0.55, 0.27, 1.55);
        }
        
        .bmi-categories {
            display: flex;
            justify-content: space-between;
            margin-top: 10px;
            font-size: 0.8rem;
            color: #555;
        }
        
        .result-card {
            display: none;
            background: white;
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            animation: fadeInUp 0.8s;
        }
        
        .result-header {
            padding: 20px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
        }
        
        .result-body {
            padding: 20px;
        }

        .info-icon {
            color: var(--secondary-color);
            margin-right: 10px;
            width: 24px;
            height: 24px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        
        .info-card {
            border-left: 4px solid var(--primary-color);
            background-color: rgba(76, 175, 80, 0.1);
            border-radius: 0 10px 10px 0;
            padding: 15px;
            margin: 15px 0;
            transition: all 0.3s ease;
        }
        
        .info-card:hover {
            transform: translateX(5px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .formula-box {
            background-color: rgba(25, 118, 210, 0.1);
            border-radius: 10px;
            padding: 20px;
            margin: 20px 0;
            border-left: 4px solid var(--secondary-color);
        }
        
        .bmi-category {
            padding: 10px 15px;
            border-radius: 50px;
            display: inline-block;
            font-weight: 600;
            margin: 5px;
            font-size: 0.9rem;
        }
        
        .category-underweight {
            background-color: #e3f2fd;
            color: #1976D2;
        }
        
        .category-normal {
            background-color: #e8f5e9;
            color: #4CAF50;
        }
        
        .category-overweight {
            background-color: #fff8e1;
            color: #FFC107;
        }
        
        .category-obese {
            background-color: #fff3e0;
            color: #FF9800;
        }
        
        .category-extreme {
            background-color: #ffebee;
            color: #F44336;
        }
        
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        @keyframes float {
            0% {
                transform: translateY(0px);
            }
            50% {
                transform: translateY(-10px);
            }
            100% {
                transform: translateY(0px);
            }
        }
        
        .float-animation {
            animation: float 4s ease-in-out infinite;
        }
        
        .bmi-vector {
            max-width: 300px;
            margin: 0 auto;
        }
        
        .svg-icon {
            width: 100%;
            max-width: 300px;
        }
        
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 30px;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border-radius: 2px;
        }
        
        table.bmi-table {
            width: 100%;
            border-collapse: collapse;
            margin: 25px 0;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            border-radius: 10px;
            overflow: hidden;
        }
        
        table.bmi-table thead tr {
            background-color: var(--primary-color);
            color: white;
            font-weight: bold;
            text-align: left;
        }
        
        table.bmi-table th,
        table.bmi-table td {
            padding: 12px 15px;
        }
        
        table.bmi-table tbody tr {
            border-bottom: 1px solid #dddddd;
        }
        
        table.bmi-table tbody tr:nth-of-type(even) {
            background-color: #f3f3f3;
        }
        
        table.bmi-table tbody tr:last-of-type {
            border-bottom: 2px solid var(--primary-color);
        }
        
        .tips-card {
            border-radius: 15px;
            padding: 20px;
            margin: 15px 0;
            background-color: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            border-top: 4px solid var(--secondary-color);
        }
        
        .tips-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
        }
        
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
            transition: all 0.3s ease;
            z-index: 999;
        }
        
        .scroll-top:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
        }
        
        .weight-for-height {
            display: none;
        }
        
        @media (max-width: 768px) {
            .header-bg {
                height: 250px;
            }
        }