*,
*::after,
*::before {
  box-sizing: border-box;
}

:root {
  font-size: 12px;
  --color-text: #000;
  --color-bg: #fff;
  --color-link: #000;
  --color-link-hover: #000;
  --page-padding: 1.5rem;
}

body {
  margin: 0;
  color: var(--color-text);
  background-color: var(--color-bg);
  /* the demo owns the vertical drag (it scrolls the helix), so suppress native scroll/overscroll */
  touch-action: none;
  overscroll-behavior: none;
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Oxygen,
    Ubuntu,
    Cantarell,
    "Open Sans",
    "Helvetica Neue",
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (scripting: enabled) {
  .loading {
    &::before,
    &::after {
      content: "";
      position: fixed;
      z-index: 10000;
    }

    &::before {
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--color-bg);
    }

    &::after {
      top: 50%;
      left: 50%;
      width: 100px;
      height: 1px;
      margin: 0 0 0 -50px;
      background: var(--color-link);
      animation: loaderAnim 1.5s ease-in-out infinite alternate forwards;
    }
  }
}

@keyframes loaderAnim {
  0% {
    transform: scaleX(0);
    transform-origin: 0% 50%;
  }

  50% {
    transform: scaleX(1);
    transform-origin: 0% 50%;
  }

  50.1% {
    transform: scaleX(1);
    transform-origin: 100% 50%;
  }

  100% {
    transform: scaleX(0);
    transform-origin: 100% 50%;
  }
}

a {
  text-decoration: none;
  color: var(--color-link);
  outline: none;
  cursor: pointer;

  &:hover {
    text-decoration: underline;
    color: var(--color-link-hover);
  }

  &:focus {
    outline: none;
    background: lightgrey;

    &:not(:focus-visible) {
      background: transparent;
    }

    &:focus-visible {
      outline: 2px solid red;
      background: transparent;
    }
  }
}

.frame {
  padding: var(--page-padding);
  display: grid;
  z-index: 1000;
  position: relative;
  gap: 1rem;
  pointer-events: none;
  justify-items: start;
  grid-template-columns: 100%;
  grid-template-areas:
    "title"
    "links"
    "demos"
    "tags"
    "sponsor";

  #cdawrap {
    justify-self: start;
    grid-area: sponsor;
  }

  a,
  button {
    pointer-events: auto;
    touch-action: none;
    -webkit-tap-highlight-color: transparent;
  }

  .frame__title {
    grid-area: title;
    font-size: inherit;
    margin: 0;
  }

  .frame__tags {
    grid-area: tags;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }

  .frame__links,
  .frame__demos {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }

  .frame__links {
    grid-area: links;
  }

  .frame__demos {
    grid-area: demos;
  }

  @media screen and (min-width: 53em) {
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    grid-template-columns: auto auto 1fr;
    grid-template-rows: auto auto;
    align-content: space-between;
    grid-template-areas:
      "title links demos"
      "tags tags sponsor";

    .frame__tags {
      align-self: end;
    }

    .frame__demos,
    #cdawrap {
      justify-self: end;
      text-align: right;
      max-width: 300px;
    }
  }
}

/* -------------------------------------------------------------------------- */
/*                                   custom                                   */
/* -------------------------------------------------------------------------- */

#sizer {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: 100vw;
  pointer-events: none;
  user-select: none;
  visibility: hidden;
  opacity: 0;
}

html,
body {
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  position: fixed;
  inset: 0;
  touch-action: none;
}

.frame {
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

/* -------------------------------------------------------------------------- */
/*                                    sound                                   */
/* -------------------------------------------------------------------------- */
/* Sits in the frame's `demos` area rather than pinned to a corner — the bottom-right corner
   belongs to #cdawrap, and a fixed button there overlaps the sponsor once it is injected. */
.sound-toggle {
  grid-area: demos;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  cursor: pointer;

  &:hover .sound-toggle__icon,
  &:focus-visible .sound-toggle__icon {
    opacity: 1;
  }

  @media screen and (min-width: 53em) {
    justify-self: end;
  }
}

.sound-toggle__icon {
  width: 1.25rem;
  height: 1.25rem;
  opacity: 0.7;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  transition: opacity 0.2s;

  /* the speaker body reads as a solid shape; only the waves and slash are strokes */
  path:first-child {
    fill: currentColor;
    stroke-linejoin: round;
  }
}

/* waves when audible, slash when muted */
.sound-toggle__slash {
  display: none;
}

.sound-toggle.is-muted {
  .sound-toggle__wave {
    display: none;
  }

  .sound-toggle__slash {
    display: block;
  }
}