:root {
            /* Color Variables */
            --purple-500: hsl(259, 100%, 65%);
            --red-400: hsl(0, 100%, 67%);
            --white: hsl(0, 100%, 100%);
            --grey-100: hsl(0, 0%, 94%);
            --grey-200: hsl(0, 0%, 86%);
            --grey-500: hsl(0, 1%, 44%);
            --black: hsl(0, 0%, 0%);
            
            /* Font Variables */
            --font-family: 'Poppins', sans-serif;
            --font-weight-regular-italic: 400i;
            --font-weight-bold: 700;
            --font-weight-extra-bold-italic: 800i;
            --font-size-inputs: 32px;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: var(--font-family);
        }
        
        body {
            background-color: var(--grey-100);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }
        
        .container {
            background: var(--white);
            border-radius: 20px 20px 150px 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            width: 100%;
            max-width: 650px;
            padding: 45px;
        }
        
        .input-group {
            margin-bottom: 35px;
            position: relative;
            padding-bottom: 40px;
            border-bottom: 2px solid var(--grey-200);
        }
        
        .input-row {
            display: flex;
            gap: 25px;
            margin-bottom: 15px;
        }
        
        .input-field {
            flex: 1;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: var(--font-weight-bold);
            color: var(--grey-500);
            text-transform: uppercase;
            font-size: 14px;
            letter-spacing: 2px;
        }
        
        input {
            width: 100%;
            padding: 15px 20px;
            border: 2px solid var(--grey-200);
            border-radius: 8px;
            font-size: var(--font-size-inputs);
            font-weight: var(--font-weight-bold);
            transition: all 0.3s;
            color: var(--black);
        }
        
        input:focus {
            border-color: var(--purple-500);
            outline: none;
            caret-color: var(--purple-500);
        }
        
        input.error {
            border-color: var(--red-400);
        }
        
        .error-message {
            color: var(--red-400);
            font-size: 12px;
            font-style: italic;
            font-weight: var(--font-weight-regular-italic);
            height: 18px;
            margin-top: 8px;
        }
        
        .button-container {
            position: relative;
            display: flex;
            justify-content: flex-end;
        }
        
        button {
            background: var(--purple-500);
            width: 70px;
            height: 70px;
            border: none;
            border-radius: 50%;
            cursor: pointer;
            transition: all 0.3s;
            position: absolute;
            top: 0px;
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 10;
        }
        
        button:hover {
            background: var(--black);
        }
        
        button img {
            width: 40px;
            height: 40px;
        }
        .result {
            margin-top: 20px;
        }
        
        .result-item {
            line-height: 1.1;
            margin-bottom: 5px;
        }
        
        .result-value {
            font-size: 80px;
            font-weight: var(--font-weight-extra-bold-italic);
            color: var(--black);
            margin-right: 10px;
        }
        
        .result-number {
            color: var(--purple-500);
            letter-spacing: -2px;
        }
        
        .result-label {
            font-size: 80px;
            font-weight: var(--font-weight-extra-bold-italic);
            color: var(--black);
        }
        
        @media (max-width: 768px) {
            .container {
                padding: 40px 25px;
                border-radius: 20px 20px 100px 20px;
            }
            
            .input-row {
                gap: 15px;
                margin-bottom: 50px;
            }
            
            input {
                font-size: 20px;
                padding: 12px 15px;
            }
            
            .button-container {
                justify-content: center;
            }
            
            button {
                top: -30px;
                width: 60px;
                height: 60px;
            }
            
            button img {
                width: 30px;
                height: 30px;
            }
            
            .result-value, .result-label {
                font-size: 50px;
            }
        }
        
        @media (max-width: 480px) {
            .input-row {
                flex-direction: column;
                gap: 20px;
            }
            
            .result-value, .result-label {
                font-size: 40px;
            }
        }