:root {
            --saffron: #FF9933;
            --white: #FFFFFF;
            --green: #138808;
            --navy: #000080;
            --teal: #008080;
            --gold: #FFD700;
            --light-bg: #f8f9fa;
            --light-saffron: #fff4e8;
            --light-green: #e8f5e9;
            --shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }
        
        body {
            background-color: var(--light-bg);
            font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: #333;
            line-height: 1.6;
        }
        
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--navy);
        }
        
        .hero-section {
            background: linear-gradient(135deg, rgba(19, 136, 8, 0.05), rgba(255, 153, 51, 0.05));
            border-radius: 20px;
            padding: 3rem 2rem;
            margin-bottom: 2rem;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid rgba(0,0,0,0.05);
        }
        
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 6px;
            background: linear-gradient(90deg, var(--saffron), var(--white), var(--green));
        }
        
        .hero-pattern {
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            opacity: 0.03;
            background-image: 
                radial-gradient(var(--saffron) 1.5px, transparent 1.5px),
                radial-gradient(var(--green) 1.5px, transparent 1.5px);
            background-size: 60px 60px;
            background-position: 0 0, 30px 30px;
            z-index: 0;
        }
        
        .calculator-card {
            background: white;
            border-radius: 18px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
            border: none;
            position: relative;
            margin-bottom: 25px;
        }
        
        .calculator-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 6px;
            background: linear-gradient(90deg, var(--saffron), var(--white), var(--green));
            z-index: 2;
        }
        
        .calculator-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.15);
        }
        
        .card-header {
            background: linear-gradient(to right, rgba(19, 136, 8, 0.08), rgba(255, 153, 51, 0.08));
            border-bottom: 1px solid rgba(0,0,0,0.05);
            padding: 1.5rem;
            font-weight: 700;
            color: var(--navy);
            font-size: 1.25rem;
        }
        
        .card-body {
            padding: 1.8rem;
        }
        
        .form-label {
            font-weight: 600;
            color: #444;
            margin-bottom: 0.6rem;
            font-size: 0.95rem;
        }
        
        .form-control, .form-select {
            border-radius: 12px;
            padding: 12px 16px;
            border: 1px solid #e0e0e0;
            transition: var(--transition);
            font-size: 1rem;
            height: auto;
        }
        
        .form-control:focus, .form-select:focus {
            border-color: var(--saffron);
            box-shadow: 0 0 0 4px rgba(255, 153, 51, 0.2);
        }
        
        .btn-primary {
            background: linear-gradient(135deg, var(--saffron), var(--green));
            border: none;
            border-radius: 50px;
            padding: 12px 28px;
            font-weight: 600;
            transition: var(--transition);
            font-size: 1.05rem;
            letter-spacing: 0.3px;
        }
        
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 18px rgba(255, 153, 51, 0.35);
            background: linear-gradient(135deg, #ff8c1a, #0d7800);
        }
        
        .result-box {
            background: linear-gradient(to right, rgba(255, 153, 51, 0.05), rgba(19, 136, 8, 0.05));
            border-radius: 14px;
            padding: 20px;
            margin-top: 25px;
            border-left: 4px solid var(--saffron);
            transition: var(--transition);
        }
        
        .result-box:hover {
            transform: scale(1.02);
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
        }
        
        .unit-badge {
            display: inline-block;
            padding: 8px 16px;
            margin-right: 10px;
            margin-bottom: 10px;
            font-size: 14px;
            font-weight: 600;
            border-radius: 12px;
            background-color: white;
            color: var(--navy);
            box-shadow: 0 3px 8px rgba(0,0,0,0.06);
            border: 1px solid rgba(0,0,0,0.06);
            transition: var(--transition);
        }
        
        .unit-badge:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            background: linear-gradient(135deg, var(--light-saffron), var(--light-green));
        }
        
        .info-section {
            background: white;
            border-radius: 18px;
            padding: 2.5rem;
            box-shadow: var(--shadow);
            margin-bottom: 2.5rem;
            border: 1px solid rgba(0,0,0,0.05);
            position: relative;
            overflow: hidden;
        }
        
        .info-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 5px;
            background: linear-gradient(90deg, var(--saffron), var(--white), var(--green));
        }
        
        .tab-content {
            padding: 25px 0;
        }
        
        .nav-tabs {
            border-bottom: 2px solid rgba(0,0,0,0.08);
            margin-bottom: 25px;
        }
        
        .nav-tabs .nav-link {
            border: none;
            border-radius: 15px 15px 0 0;
            padding: 14px 30px;
            font-weight: 600;
            color: #555;
            transition: var(--transition);
            font-size: 1.05rem;
            margin-right: 8px;
            background: rgba(0,0,0,0.03);
        }
        
        .nav-tabs .nav-link.active {
            background: linear-gradient(135deg, var(--saffron), var(--green));
            color: white;
            box-shadow: 0 -4px 12px rgba(0,0,0,0.08);
            transform: translateY(-2px);
        }
        
        .nav-tabs .nav-link:hover:not(.active) {
            background: rgba(19, 136, 8, 0.1);
            transform: translateY(-2px);
        }
        
        .conversion-history {
            max-height: 240px;
            overflow-y: auto;
            margin-top: 20px;
            border: 1px solid #f0f0f0;
            border-radius: 14px;
            padding: 15px;
            background: white;
        }
        
        .history-item {
            padding: 10px 15px;
            border-bottom: 1px solid #f0f0f0;
            font-size: 0.95rem;
            border-radius: 8px;
            transition: var(--transition);
        }
        
        .history-item:hover {
            background: rgba(255, 153, 51, 0.05);
            transform: translateX(3px);
        }
        
        .history-item:last-child {
            border-bottom: none;
        }
        
        .shape-btn {
            width: 100%;
            padding: 18px;
            text-align: center;
            border: 2px solid #eaeaea;
            border-radius: 14px;
            background: white;
            transition: var(--transition);
            margin-bottom: 12px;
            cursor: pointer;
            box-shadow: 0 3px 8px rgba(0,0,0,0.05);
        }
        
        .shape-btn.active, .shape-btn:hover {
            border-color: var(--saffron);
            background: rgba(255, 153, 51, 0.08);
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(255, 153, 51, 0.15);
        }
        
        .shape-btn i {
            font-size: 2.3rem;
            margin-bottom: 12px;
            color: var(--saffron);
        }
        .feature-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 60px;
            height: 60px;
            border-radius: 18px;
            background: linear-gradient(135deg, var(--light-saffron), var(--light-green));
            margin-bottom: 20px;
            font-size: 28px;
            color: var(--navy);
        }
        
        .feature-card {
            background: white;
            border-radius: 18px;
            padding: 25px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
            text-align: center;
            border: 1px solid rgba(0,0,0,0.05);
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.12);
        }
        
        .price-badge {
            padding: 6px 14px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.85rem;
        }
        
        .bg-saffron-light {
            background: var(--light-saffron);
        }
        
        .bg-green-light {
            background: var(--light-green);
        }
        
        @media (max-width: 768px) {
            .hero-section {
                padding: 1.8rem 1.2rem;
            }
            
            .card-header {
                padding: 1.2rem;
                font-size: 1.15rem;
            }
            
            .card-body {
                padding: 1.2rem;
            }
            
            .info-section {
                padding: 1.8rem;
            }
            
            .nav-tabs .nav-link {
                padding: 12px 20px;
                font-size: 0.95rem;
                margin-bottom: 8px;
            }
        }