body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue;
  font-size: 14px;
  line-height: 1.4;
  color: var(--body-text-color);
  background: var(--body-bg);
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
}

.container {
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  will-change: transform; /* avoids "Repaints on Scroll" warning in Chrome */
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  @media (max-width: 767px) {
    top: 62px;
  }
}

main {
  position: relative;
  width: 602px;
  max-width: 100vw;
  padding: 0;
  box-sizing: border-box;
  margin: 30px auto 15px;
  background: var(--main-bg);
  border: 1px solid var(--main-border);
  border-radius: 1px;
  @media (max-width: 767px) {
    margin: 5px auto 15px;
  }
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em 0;
  font-weight: 400;
  line-height: 1.2;
}

h1 {
  font-size: 2em;
}

a {
  color: var(--anchor-text);
  text-decoration: none;
}

a:visited {
  color: var(--anchor-text);
}

a:hover {
  text-decoration: underline;
}

input {
  border: 1px solid var(--input-border);
  padding: 5px;
  box-sizing: border-box;
}

button, .button {
  font-size: 1.2em;
  background: var(--button-bg);
  border-radius: 2px;
  padding: 10px 15px;
  border: 1px solid var(--button-border);
  cursor: pointer;
  color: var(--button-text);

  &:hover {
    background: var(--button-bg-hover);
    text-decoration: none;
  }

  &:active {
    background: var(--button-bg-active);
  }

  &[disabled] {
    opacity: 0.35;
    pointer-events: none;
    cursor: not-allowed;
  }

  &.primary {
    border: 1px solid var(--button-primary-border);
    background: var(--button-primary-bg);
    color: var(--button-primary-text);

    &:hover {
      background: var(--button-primary-bg-hover);
    }

    &:active {
      background: var(--button-primary-bg-active);
    }
  }
}

p, label, input {
  font-size: 1.3em;
}

ul, li, p {
  padding: 0;
  margin: 0;
}

.hidden {
  opacity: 0;
}

*:focus {
  outline: 2px solid var(--focus-outline);
}

button::-moz-focus-inner {
  border: 0;
}

/* Firefox hacks to remove ugly red border.
   Unnecessary since it gives a warning if you submit an empty field anyway. */
input:required, input:invalid {
  box-shadow: none;
}

textarea {
  font-family: inherit;
  font-size: inherit;
  box-sizing: border-box;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  50% {
    transform: rotate(180deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.spin {
  animation: spin 2s infinite linear;
}