*,
*::before,
*::after {
  box-sizing: border-box;
}
html,
body {
  min-height: 100%;
  background-color: #202124;
}
body {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  margin: 0;
}
.bg,
.pattern,
.index {
  min-height: 100vh;
}
.bg {
  background-color: hsl(208, 4%, 98%);
}
.pattern {
  background: repeating-linear-gradient(
      45deg,
      transparent,
      transparent 25%,
      rgba(0, 0, 0, 0.1) 25%,
      rgba(0, 0, 0, 0.2) 50%
    ),
    repeating-linear-gradient(
      135deg,
      transparent,
      transparent 25%,
      rgba(0, 0, 0, 0.1) 25%,
      rgba(0, 0, 0, 0.2) 50%
    ),
    repeating-linear-gradient(
      180deg,
      transparent,
      transparent 50%,
      rgba(0, 0, 0, 0.1) 50%,
      rgba(0, 0, 0, 0.2) 100%
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 50%,
      rgba(0, 0, 0, 0.1) 50%,
      rgba(0, 0, 0, 0.2) 100%
    );
  background-size: 8rem 16rem;
}
.index {
  background: linear-gradient(
    to top,
    hsla(208, 8%, 8%, 0.88) 0%,
    hsla(208, 4%, 4%, 0.94) 100%
  );
  display: flex;
  align-items: center;
}
main {
  letter-spacing: 0.025em;
  display: block;
  max-width: 32rem;
  margin: 0 auto;
  padding: 1.5rem;
  line-height: 1.5;
  color: hsla(208, 16%, 96%, 0.96);
}
h1 {
  font-weight: 300;
  font-size: 3rem;
  margin: 0;
}
p {
  font-size: 1.125rem;
  margin: 0;
}
section {
  padding: 1rem 0;
}
nav {
  display: flex;
  justify-content: space-evenly;
}
a {
  display: block;
  text-align: center;
  text-decoration: none;
  flex: 1 1 auto;
  background-color: transparent;
}
.nav-link {
  color: #e8eaed;
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.64);
  padding: 0.75rem 1rem;
  margin: 1rem 1rem 2rem;
  border-radius: 0.5rem;
  max-width: 12rem;
  text-transform: uppercase;
  letter-spacing: 0.125rem;
  font-weight: 500;
  transform: scale(1);
  transition: all 0.2s;
}
.nav-link:hover,
.nav-link:active,
.nav-link:focus {
  transform: scale(1.05);
}
.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.8);
}
.nav-link:active,
.nav-link:focus {
  background-color: rgba(255, 255, 255, 0.24);
  border: 1px solid #e8eaed;
}
@media (max-width: 512px) {
  main {
    padding: 1rem;
  }
}
@media (max-width: 400px) {
  h1 {
    font-size: 2.5rem;
    margin-bottom: 0.25rem;
  }
  .nav-link {
    margin: 1rem 0.5rem 2rem;
  }
}
@media (max-width: 384px) {
  nav {
    display: block;
  }
  .nav-link {
    margin: 1rem auto 2rem;
  }
}
@media (max-width: 340px) {
  h1 {
    font-size: 2.25rem;
  }
}