:root {
  --header: #fefefe;
  --text: #222;
  --text-gray: #555;
}

html {
  height: 100%;
}
body {
  height: 100%;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  display: flex;
  flex-direction: column;
  color: var(--text);
}
header {
  text-align: center;
  background-color: var(--header);
  padding: 0 2rem 0 2rem;
}
.header-link {
  transition: color .3s;
  font-size: .9rem;
  padding: 0 1rem 0 1rem;
  color: darkgray;
  text-decoration: none;
}
.header-link[active], .header-link:hover {
  color: #000;
}
h1 {
  font-size: 4rem;
  font-weight: 200;
  letter-spacing: 1px;
}
h2 {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 1px;
  margin-bottom: 2rem;
}
h3 {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 1rem;
}
a > h3 {
  color: var(--text);
}
p {}
main {
  background-color: #fff;
  padding: 3rem;
}
@media only screen and (max-width: 340px) {
  main {
    padding: 1rem;
  }
}
.text-center {
  text-align: center;
}
.center {
  margin-left: auto;
  margin-right: auto;
}
.mean {
  min-width: 24rem;
  max-width: 42rem;
}
.project {
  max-width: 25rem;
  display: flex;
  padding: 1rem;
}
.project-box {
  flex:1;
  display: flex;
  align-items: center;
}
.project-description {
  font-style: italic;
  font-size: 1.4rem;
  font-weight: 300;
}
.btn {
  display: inline-block;
  text-decoration: none;
  padding: .7rem;
  font-size: 1.2rem;
  border-radius: 5px;
  color: black;
  background-color: #eee;
  transition: background-color .3s;
}
.btn:hover {
  background-color: var(--background);
}
.app-icon {
  width: 100px;
}
.app-icon.watch {
  border-radius: 100%;
}
.platform {
  margin-top: -0.5rem;
  color: var(--text-gray);
  font-weight: 500;
}
footer {
  text-align: center;
  margin-top: auto;
  background-color: var(--header);
  padding: 1rem 2rem 1rem 2rem;
}