:root {
  --background-rgb: 0 0 0;
  --background-light-rgb: 30 0 0;

  --border-rgb: 255 255 255;
  --border: 1px solid rgb(var(--border-rgb) / 20%);

  --accent-main-rgb: 255 0 0;
  --accent-light-rgb: 255 128 0;
  --accent-secondary-rgb: 255 135 0;

  --card-size: 90vmin;
  --font-size: 0.8rem;
  --gradient-stop: 35%;
}

body {
  background: rgb(var(--background-rgb));
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  font-family: "Noto Sans", sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.card-track {
  height: 100%;
  width: var(--card-size);
  display: flex;
  align-items: center;
  position: relative;
}

.card-wrapper {
  width: 100%;
  position: relative;
}

.card {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  position: relative;
  margin: 0;
  border-radius: 0rem;
  overflow: hidden;
  cursor: pointer;
}

.card-image {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 4;
}

.card-gradient {
  height: 100%;
  width: 100%;
  position: absolute;
  background: radial-gradient(
    circle farthest-side,
    rgb(var(--background-light-rgb)) var(--gradient-stop),
    rgb(var(--accent-main-rgb)) 50%,
    rgb(var(--accent-light-rgb)),
    rgb(var(--accent-secondary-rgb))
  );
  mix-blend-mode: darken;
  pointer-events: none;
  z-index: 3;
}

.card-letters {
  --x: 0px;
  --y: 0px;
  position: absolute;
  left: 0px;
  top: 0px;
  height: 100%;
  width: 100%;
  color: white;
  font-size: var(--font-size);
  font-weight: 500;
  word-wrap: break-word;
  opacity: 0;
  transition: opacity 400ms;
  mask-image: radial-gradient(
    calc(var(--card-size) * 0.8) circle at var(--x) var(--y),
    rgb(255 255 255) 5%,
    rgb(255 255 255 / 10%),
    transparent
  );
  scale: 1.03;
}

.card:hover .card-letters {
  opacity: 1;
}

@media (max-width: 900px) {
  .controls {
    left: auto;
    right: 1rem;
    translate: 0 -50%;
  }
}

@media (max-width: 600px) {
  :root {
    --card-size: 340px;
  }

  .card {
    border-radius: 1rem;
  }
}

.card-track:before,
.card-track:after {
  content: "";
  height: 100vh;
  width: 1px;
  position: absolute;
  top: 50%;
  translate: 0% -50%;
}

.card-track:before {
  left: -1px;
  border-left: var(--border);
}

.card-track:after {
  right: -1px;
  border-right: var(--border);
}

.card-wrapper:before,
.card-wrapper:after {
  content: "";
  width: 100vw;
  position: absolute;
  left: 50%;
  translate: -50%;
}

.card-wrapper:before {
  top: -1px;
  border-top: var(--border);
}

.card-wrapper:after {
  bottom: -1px;
  border-bottom: var(--border);
}

.card-corners {
  height: 100%;
  width: 100%;
  position: absolute;
  left: 0px;
  top: 0px;
  z-index: 3;
  pointer-events: none;
}

.card-corners > .card-corner {
  display: block;
  height: 9px;
  width: 1px;
  position: absolute;
  background-color: white;
}

.card-corners > .card-corner:after {
  content: "";
  width: 9px;
  height: 1px;
  position: absolute;
  left: -4px;
  top: 4px;
  background-color: white;
}

.card-corners > .card-corner:nth-child(1) {
  left: -1px;
  top: -5px;
}

.card-corners > .card-corner:nth-child(2) {
  right: -1px;
  top: -5px;
}

.card-corners > .card-corner:nth-child(3) {
  right: -1px;
  bottom: -5px;
}

.card-corners > .card-corner:nth-child(4) {
  left: -1px;
  bottom: -5px;
}

.center-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 10;
  pointer-events: none;
  image-rendering: pixelated;
}

.controls {
  position: fixed;
  top: 50%;
  left: calc(75vw + 22.5vmin);
  translate: -50% -50%;
  z-index: 20;
  width: 340px;
  padding: 1.25rem;
  border: var(--border);
  border-radius: 1rem;
  background: rgb(var(--background-light-rgb) / 60%);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.controls h1 {
  font-size: 1rem;
  font-weight: 600;
  color: white;
  letter-spacing: 0.02em;
}

.control-row {
  display: grid;
  grid-template-columns: 5.5rem 1fr 3.5rem;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: rgb(255 255 255 / 80%);
}

.control-row input[type="range"] {
  width: 100%;
  accent-color: rgb(var(--accent-main-rgb));
}

.control-row output {
  text-align: right;
  font-family: monospace;
  font-size: 0.75rem;
  color: rgb(255 255 255 / 70%);
}