body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f8f9fa;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 20px auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #495057;
}

input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input[type="text"]:focus {
    border-color: #3498db;
    outline: none;
}

.radio-group {
    display: flex;
    gap: 20px;
    margin-top: 10px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: normal;
    cursor: pointer;
}

button {
    background-color: #3498db;
    color: white;
    padding: 14px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    width: 100%;
    font-size: 16px;
    font-weight: 600;
    transition: background-color 0.3s;
    margin-top: 10px;
}

button:hover {
    background-color: #2980b9;
}

#result {
    margin-top: 30px;
    padding: 15px;
    border-radius: 6px;
    line-height: 1.6;
}

#result .message {
    padding: 10px;
}

.success {
    background-color: #e8f5e9;
    border-left: 4px solid #4caf50;
}

.error {
    background-color: #ffebee;
    border-left: 4px solid #f44336;
}

.info {
    background-color: #e3f2fd;
    border-left: 4px solid #2196f3;
}

.tip {
    color: #6c757d;
    font-size: 14px;
    text-align: center;
    margin-top: 20px;
}

.success-message {
    line-height: 1.6;
}

.success-message strong {
    color: #2c3e50;
    font-weight: 600;
}