:root {
  --text: #e8fff5;
  --muted: rgba(232, 255, 245, 0.68);
  --card-aspect: 1.5454545455; /* 85 / 55 */
  --card-target-width: 153mm;
  --card-width: min(
    var(--card-target-width),
    calc((100vw - 48px) * 0.9),
    calc((100dvh - 96px) * var(--card-aspect) * 0.9)
  );
  --card-radius: 4px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #111212;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  color: var(--text);
  font-family: Consolas, "Cascadia Mono", "Courier New", monospace;
}

.background-frame {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  border: 0;
  pointer-events: none;
}

.page-shell {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  padding: 0;
  isolation: isolate;
}

.page-title {
  position: fixed;
  z-index: 3;
  top: clamp(20px, 4vw, 44px);
  left: clamp(20px, 4vw, 52px);
  margin: 0;
  font-size: clamp(1.2rem, 2.4vw, 2.4rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  text-shadow: 0 10px 26px rgba(0, 0, 0, 0.45);
  pointer-events: none;
}

.card-stage {
  position: relative;
  z-index: 2;
  width: var(--card-width);
  aspect-ratio: 85 / 55;
  perspective: 1400px;
  isolation: isolate;
}

.card-stage::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 10% 2% 0;
  border-radius: 50%;
  background: #000;
  filter: blur(64px);
  opacity: 1;
  transform: translate(44px, 58px) scale(1.24, 0.8);
  transition:
    opacity 900ms var(--ease-out),
    transform 900ms var(--ease-out),
    filter 900ms var(--ease-out);
}

.card-stage:hover::after,
.card-stage:focus-within::after,
.card-stage.is-avoiding::after {
  filter: blur(72px);
  opacity: 0.86;
  transform: translate(58px, 76px) scale(1.38, 0.92);
}

.business-card {
  position: relative;
  width: 100%;
  height: 100%;
  border: 0;
  padding: 0;
  border-radius: var(--card-radius);
  background: transparent;
  cursor: pointer;
  transform-style: preserve-3d;
  transition:
    transform 900ms var(--ease-out),
    filter 320ms ease;
  will-change: transform;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

.business-card:hover,
.business-card:focus-visible,
.business-card.is-avoiding {
  transform: translateZ(28px);
}

.business-card.is-flipped {
  transform: rotateY(180deg);
}

.business-card.is-flipped:hover,
.business-card.is-flipped:focus-visible,
.business-card.is-flipped.is-avoiding {
  transform: translateZ(28px) rotateY(180deg);
}

.business-card:focus-visible {
  outline: 2px solid rgba(174, 255, 218, 0.78);
  outline-offset: 12px;
}

.card-face {
  position: absolute;
  inset: 0;
  display: block;
  overflow: hidden;
  border-radius: var(--card-radius);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: rgba(12, 14, 14, 0.86);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.08),
    inset 0 -60px 100px rgba(0, 0, 0, 0.18);
}

.card-face-front {
  transform: rotateY(0deg);
}

.card-face-back {
  transform: rotateY(180deg);
  background: #f7f7f2;
}

.card-face-back::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 30;
  pointer-events: none;
  background:
    linear-gradient(115deg, rgba(255, 255, 255, 0.34), rgba(255, 255, 255, 0.04) 28%, rgba(0, 0, 0, 0.045) 56%, rgba(255, 255, 255, 0.16) 100%),
    repeating-linear-gradient(112deg, rgba(255, 255, 255, 0.13) 0 1px, rgba(0, 0, 0, 0.025) 1px 2px, transparent 2px 7px);
  opacity: 0.62;
  mix-blend-mode: soft-light;
}

.business-card:not(.is-flipped) .card-face-back,
.business-card.is-flipped .card-face-front {
  pointer-events: none;
}

.card-face > * {
  width: 100%;
  height: 100%;
  border-radius: inherit;
}

.card-loading,
.card-error {
  display: grid;
  place-items: center;
  margin: 0;
  padding: 2rem;
  color: var(--muted);
  text-align: center;
  background: rgba(10, 12, 12, 0.88);
}

.card-stage::before {
  content: "click card to flip";
  position: absolute;
  left: 50%;
  bottom: -42px;
  transform: translateX(-50%);
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

@media (max-width: 700px) {
  :root {
    --card-width: min(
      calc((100vw - 28px) * 0.9),
      calc((100dvh - 84px) * var(--card-aspect) * 0.9)
    );
  }

  .page-title {
    font-size: clamp(1rem, 5vw, 1.45rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .business-card {
    transition: none;
  }

}