*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  font-size: 16px;
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}
a {
  color: var(--primary-color);
  text-decoration: none;
}
button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}
input, textarea, select {
  font-family: inherit;
}