body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            margin: 0;
            padding: 20px;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }

        .container {
            max-width: 600px;
            margin: 0 auto;
            background: white;
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }

        h1 {
            color: #2c3e50;
            text-align: center;
            margin: 30px 0;
            font-size: 2.5em;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }

        .section {
            margin-bottom: 40px;
            padding: 20px;
            border-radius: 10px;
            background: #f8f9fa;
        }

        label {
            display: block;
            margin-bottom: 8px;
            color: #34495e;
            font-weight: 600;
        }

        input {
            width: 100%;
            padding: 12px;
            margin: 8px 0;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s ease;
        }

        input:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 5px rgba(52,152,219,0.3);
        }

        button {
            background: #3498db;
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            transition: all 0.3s ease;
            width: 100%;
            margin-top: 10px;
        }

        button:hover {
            background: #2980b9;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .result {
            margin-top: 20px;
            padding: 15px;
            border-radius: 8px;
            background: #e8f4f8;
            color: #2c3e50;
            font-weight: 500;
            text-align: center;
            min-height: 20px;
        }