:root {
  --space: 1rem;
  --bg: #09090b;
  --fg: #e3e3e3;
  --surface-1: #101012;
  --surface-2: #27272a;
  --surface-3: #52525b;
  --ease-out: cubic-bezier(0.5, 1, 0.89, 1);
  --ease-in-out: cubic-bezier(0.45, 0, 0.55, 1);
}

* {
  box-sizing: border-box;
}

height,
body {
  height: 100%;
}

body {
  display: grid;
  color: var(--fg);
  background: var(--bg);
  padding: var(--space);
  min-height: 100vh;
}

main {
  display: grid;
  grid-template-columns: repeat(var(--count, 1), 1fr);
  gap: var(--space);
  margin: auto;
  inline-size: min(var(--max, 15rem), 100%);

  @media (min-width: 25rem) {
    --count: 2;
    --max: 30rem;
  }

  @media (min-width: 45rem) {
    --count: 4;
    --max: 60rem;
  }
}

.card {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-areas: "card";
  place-items: center;
  aspect-ratio: 4/5;
  border: 1px solid var(--surface-2);
  isolation: isolate;
  transition: border-color 200ms var(--ease-out);
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;

  &::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(
      circle at bottom left,
      transparent 55%,
      var(--surface-1)
    );
    pointer-events: none;
    box-shadow: var(--bg) -0.5cqi 0.5cqi 2.5cqi inset;
    transition: opacity 900ms var(--ease-out);
  }

  &::after {
    content: "";
    position: absolute;
    inset: 0;
    margin: auto;
    aspect-ratio: 1;
    background: radial-gradient(circle, var(--bg), transparent 65%);
    opacity: 0;
    transition: opacity 800ms var(--ease-out);
  }

  > * {
    grid-area: card;
  }

  svg {
    position: relative;
    z-index: 1;
    width: 30%;
    height: auto;
    color: var(--surface-3);
    transition: 300ms var(--ease-out);
    transition-property: color, scale;
  }

  button {
    opacity: 0;
  }

  &:focus-within {
    outline: 5px auto Highlight;
    outline: 5px auto -webkit-focus-ring-color;
  }

  &:where(:hover, :focus-within) {
    border-color: var(--active-color, var(--fg));
    transition: border-color 800ms var(--ease-in-out);
  }

  &:where(:hover, :focus-within) svg {
    color: var(--active-color, var(--fg));
    scale: 1.1;
    transition: 300ms var(--ease-in-out);
  }

  &:where(:hover, :focus-within)::before {
    opacity: 0;
  }

  &:where(:hover, :focus-within)::after {
    opacity: 1;
  }
}