header {
  padding: 100px 25px;

  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 50px;
}

.header_text {
  width: 850px;
}

nav {
  margin-bottom: 120px;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
}

nav a {
  color: var(--secondary-text-color);
  text-decoration: none;
  position: relative;
  padding: 3px;
}

nav a:hover {
  color: var(--text-color);
}

nav a::after {
  content: '';
  height: 2px;
  width: 0%;
  background: var(--main-brand-color);
  position: absolute;
  bottom: 0;
  left: 0;
  transition: 150ms ease-in-out;
} 

nav a:hover::after {
  width: 100%;
}

.subheading {
  margin-top: 25px;
  color: var(--secondary-text-color);
}

.circle {
  height: 400px;
  width: 400px;

  max-height: 80vw;
  max-width: 80vw;

  overflow: hidden;
  border-radius: 50%;
  border: 20px solid var(--main-brand-color);
  background: gray;

  display: flex;
  justify-content: center;
  align-items: center;
}

.circle img {
  width: 60%;
  transform: translate(0, 8px);
}

#toggle_button {
  display: none;
}

label[for="toggle_button"] {
  display: none;
}

label[for="toggle_button"] span {
  font-size: 40px;
}

@media(max-width: 800px) {
  nav{
      position: absolute;
      top: 0;
      left: 0;
      background: var(--secondary-color);
      padding: 15px;
      border-radius: 0 0 25px 0;
  }

  nav ul {
      display: none;
      flex-direction: column;
  }

  label[for="toggle_button"] {
      display: block;
  }

  #toggle_button:checked ~ ul {
      display: flex;
  }

  h1 {
    font-size: 12vw;
  }
}