* {
  box-sizing: border-box;
}

html {
  font-family: "Nanum Gothic", sans-serif;
  background-image: url(https://www.econcepts.ie/wp-content/uploads/2016/04/bp_background_2_blue1.jpg);
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
  color: white;
}

html,
body {
  text-align: center;
  /*width: 100%;
    height: 100%;*/
}

.menu a {
  display: none;
}

.nav,
footer {
  padding: 0;
}

.nav {
  left: 0;
  right: 0;
  top: 0;
  z-index: 10;
  text-align: right;
  opacity: 0.7;
}

.menu {
  margin: 0 30px 0 0;
  display: none;
}

.menu a {
  display: block;
  margin: 0;
  text-align: center;
  color: lightblue;
}

.menu a:hover {
  color: yellow;
  opacity: 0.8;
}

#toggle:checked + .menu {
  display: block;
}

label {
  margin: 0 5px 0 0;
  font-size: 26px;
  cursor: pointer;
}

#toggle {
  display: none;
}

.headline h1 {
  font-size: 18px;
  line-height: 27px;
}

section {
  margin-top: 5px;
}

header {
  padding: 100px 0;
}

.navin {
  border-radius: 50%;
  margin-top: 30px;
  width: 175px;
  height: 175px;
  display: block;
  margin-right: auto;
  margin-left: auto;
  position: relative;
  top: 25px;
  opacity: 0.5;
}

#bio-section {
  margin-top: 10px;
  margin-right: 5px;
  margin-left: 5px;
}

#bio-section > p {
  text-align: left;
  font-size: 16px;
  line-height: 22px;
}

.image {
  border: 1px ridge lightblue;
  width: 300px;
  height: 200px;
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-top: 30px;
}

#portfolio-section {
  margin: 250px 0 30px 0;
}

footer {
  margin-top: 150px;
  position: relative;
  bottom: 0;
  left: 0;
  right: 0;
}

ul > li {
  font-size: 15px;
  text-align: start;
  line-height: 19px;
}

a {
  color: lightblue;
  text-decoration: none;
}

#portfolio-section > h2 {
  font-size: 40px;
  font-family: "KoHo", sans-serif;
  margin-bottom: 100px;
}

footer {
  display: flex;
  flex-direction: row;
  justify-content: space-around;
}

.contact-logo {
  width: 25px;
  height: 25px;
  border-radius: 50%;
}

@media screen and (min-width: 768px) {
  .nav,
  footer {
    padding: 0;
  }

  .headline {
    margin-top: 30px;
  }

  .headline > h1 {
    font-size: 23px;
    line-height: 45px;
  }

  .headline > h2 {
    font-size: 30px;
    margin-left: 10px;
    margin-right: 10px;
    margin-top: 20px;
  }

  .navin {
    width: 225px;
    height: 225px;
  }

  #portfolio-section > h2 {
    font-size: 45px;
  }

  #bio-section > p {
    line-height: 25px;
    margin-left: 15px;
    margin-right: 15px;
  }

  .image {
    border: 1px ridge lightblue;
    width: 475px;
    height: 350px;
  }

  .contact-logo {
    width: 35px;
    height: 35px;
  }

  ul > li {
    line-height: 25px;
  }
}

@media screen and (min-width: 1024px) {
  .nav,
  footer {
    padding: 1% 0;
  }

  .headline > h1 {
    font-size: 45px;
    line-height: 70px;
  }

  #bio-section > p {
    font-size: 20px;
    line-height: 28px;
    margin-right: 20px;
    margin-left: 20px;
  }

  #portfolio-section > h2 {
    font-size: 48px;
  }

  ul > li {
    font-size: 17px;
    text-align: start;
    line-height: 25px;
  }

  #toggle,
  label {
    display: none;
  }

  .menu {
    display: flex;
    flex-direction: row;
    justify-content: flex-end;
  }
  .menu a {
    display: inline;
    font-size: 16px;
    text-decoration: none;
    margin: 0 10px;
    color: lightblue;
  }

  .contact-logo {
    width: 45px;
    height: 45px;
  }

  .image {
    border: 1px ridge lightblue;
    width: 750px;
    height: 500px;
  }
}