:root {
            --primary: #4f46e5;      
            --primary-hover: #4338ca;
            --success: #10b981;      
            --background: #f3f4f6;   
            --surface: #ffffff;     
            --text-main: #1f2937;    
            --text-muted: #6b7280;  
            --border: #e5e7eb;       
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            background-color: var(--background);
            color: var(--text-main);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            padding: 20px;
            box-sizing: border-box;
        }

        .container {
            background-color: var(--surface);
            padding: 40px;
            border-radius: 16px;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            width: 100%;
            max-width: 480px;
        }

        h1 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-top: 0;
            margin-bottom: 24px;
            color: var(--primary);
            text-align: center;
        }

        .input-group {
            display: flex;
            flex-direction: column;
            gap: 16px;
            margin-bottom: 24px;
        }

        input[type="number"], select {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 1rem;
            color: var(--text-main);
            background-color: #f9fafb;
            transition: all 0.2s ease;
            box-sizing: border-box;
        }

        input[type="number"]:focus, select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
            background-color: #fff;
        }

        button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 14px;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.2s ease, transform 0.1s ease;
        }

        button:hover {
            background-color: var(--primary-hover);
        }

        button:active {
            transform: scale(0.98);
        }

        #resultadoDisplay {
            text-align: center;
            font-size: 1.5rem;
            color: var(--success);
            background-color: rgba(16, 185, 129, 0.1);
            padding: 16px;
            border-radius: 8px;
            min-height: 28px; 
            margin-bottom: 32px;
        }

        hr {
            border: none;
            border-top: 1px solid var(--border);
            margin: 24px 0;
        }

      
        h3 {
            font-size: 1.1rem;
            color: var(--text-muted);
            margin-bottom: 16px;
        }

        #userIp {
            font-weight: bold;
            color: var(--primary);
        }

        ul {
            list-style-type: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-height: 250px;
            overflow-y: auto; 
        }

        ul::-webkit-scrollbar {
            width: 6px;
        }
        ul::-webkit-scrollbar-thumb {
            background-color: #cbd5e1;
            border-radius: 4px;
        }

        li {
            background-color: #f8fafc;
            border: 1px solid var(--border);
            padding: 12px;
            border-radius: 8px;
            font-size: 0.9rem;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        li span.cashback-ganho {
            color: var(--success);
            font-weight: 600;
        }