:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #020712;
  color: #f4f7ff;
  --rx: 0deg;
  --ry: 0deg;
  --mx: 50%;
  --my: 50%;
  --intensity: 0;
  --bgx: 50%;
  --bgy: 50%;
  --card-opacity: 0;
  --pointer-from-center: 0;
  --card-ratio: 1074 / 1344;
  --red: #f80e35;
  --yellow: #eedf10;
  --green: #21e985;
  --blue: #0dbde9;
  --violet: #c929f1;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body { min-height: 100svh; overflow-x: hidden; }

button, body { font: inherit; }

.stage {
  position: relative;
  display: grid;
  min-height: 100svh;
  place-items: center;
  overflow: hidden;
  padding: max(32px, env(safe-area-inset-top)) 20px max(32px, env(safe-area-inset-bottom));
  background:
    radial-gradient(circle at 50% 38%, rgba(21, 73, 151, .2), transparent 38%),
    linear-gradient(145deg, #030916, #01030a 70%);
  perspective: 1100px;
}

.stage::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .13;
  pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.12) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.12) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(circle, black, transparent 72%);
}

.ambient { position: absolute; width: 45vw; aspect-ratio: 1; border-radius: 50%; filter: blur(90px); opacity: .17; }
.ambient-one { background: #006fff; top: -20%; left: -10%; }
.ambient-two { background: #cc35ff; right: -15%; bottom: -25%; }

.demo { position: relative; z-index: 1; width: min(100%, 580px); text-align: center; }
.eyebrow { margin: 0 0 8px; color: #76aaff; font-size: 11px; font-weight: 750; letter-spacing: .22em; }
h1 { margin: 0; font-size: clamp(32px, 8vw, 56px); letter-spacing: -.055em; line-height: .96; }
.instructions { margin: 14px auto 22px; color: #96a4bc; font-size: 14px; }

.card-wrap { width: min(72vw, 380px); margin: 0 auto; transform-style: preserve-3d; }
.card {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: var(--card-ratio);
  border-radius: 4.2% / 3.4%;
  background: #071227;
  box-shadow: 0 35px 80px rgba(0,0,0,.55), 0 8px 25px rgba(0,0,0,.55), 0 0 0 1px rgba(164,201,255,.25);
  transform: rotateX(var(--rx)) rotateY(var(--ry)) translateZ(0);
  transform-style: preserve-3d;
  isolation: isolate;
  transition: transform 120ms ease-out, box-shadow 200ms ease;
  will-change: transform;
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 5;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.24), inset 0 0 24px rgba(176,215,255,.15);
  pointer-events: none;
}

.card img { display: block; width: 100%; height: 100%; object-fit: cover; user-select: none; }
.card__shine,
.card__shine::before,
.card__shine::after,
.card__glare,
.card__glare-secondary {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  will-change: opacity, filter, background-position;
}

/* Faithful regular-holo material stack adapted from simeydotme/pokemon-cards-css. */
.card__shine,
.card__shine::before,
.card__shine::after {
  -webkit-mask: url("./public/channels/foil-mask.png") center / 100% 100%;
  mask: url("./public/channels/foil-mask.png") center / 100% 100%;
}

.card__shine {
  /* Proportional frequency keeps the same line count at every card width/DPR. */
  --scanlines-space: .15%;
  --scanlines-light: #666;
  --scanlines-dark: #000;
  --bars: 3%;
  --bar-color: hsla(0, 0%, 70%, 1);
  --bar-bg: #000;
  z-index: 3;
  overflow: hidden;
  opacity: var(--card-opacity);
  background-image:
    repeating-linear-gradient(110deg,
      var(--violet), var(--blue), var(--green), var(--yellow), var(--red),
      var(--violet), var(--blue), var(--green), var(--yellow), var(--red),
      var(--violet), var(--blue), var(--green), var(--yellow), var(--red)),
    repeating-linear-gradient(90deg,
      var(--scanlines-dark) 0,
      var(--scanlines-dark) calc(var(--scanlines-space) * 2),
      var(--scanlines-light) calc(var(--scanlines-space) * 2),
      var(--scanlines-light) calc(var(--scanlines-space) * 4));
  background-position:
    calc(((50% - var(--bgx)) * 2.6) + 50%) calc(((50% - var(--bgy)) * 3.5) + 50%),
    center;
  background-size: 400% 400%, cover;
  background-blend-mode: overlay;
  filter: brightness(1.1) contrast(1.1) saturate(1.2);
  mix-blend-mode: color-dodge;
}

.card__shine::before {
  content: "";
  background-image:
    repeating-linear-gradient(90deg,
      var(--bar-bg) calc(var(--bars) * 2), var(--bar-color) calc(var(--bars) * 3),
      var(--bar-bg) calc(var(--bars) * 3.5), var(--bar-color) calc(var(--bars) * 4),
      var(--bar-bg) calc(var(--bars) * 5), var(--bar-bg) calc(var(--bars) * 14)),
    repeating-linear-gradient(90deg,
      var(--bar-bg) calc(var(--bars) * 2), var(--bar-color) calc(var(--bars) * 3),
      var(--bar-bg) calc(var(--bars) * 3.5), var(--bar-color) calc(var(--bars) * 4),
      var(--bar-bg) calc(var(--bars) * 5), var(--bar-bg) calc(var(--bars) * 10));
  background-position:
    calc((((50% - var(--bgx)) * 1.65) + 50%) + (var(--bgy) * .5)) var(--bgx),
    calc((((50% - var(--bgx)) * -.9) + 50%) - (var(--bgy) * .75)) var(--bgy);
  background-size: 200% 200%, 200% 200%;
  background-blend-mode: screen;
  mix-blend-mode: hard-light;
  filter: brightness(1.15) contrast(1.1);
}

.card__shine::after {
  content: "";
  background: radial-gradient(farthest-corner circle at var(--mx) var(--my),
    hsla(0, 0%, 90%, .8) 0%, hsla(0, 0%, 78%, .1) 25%, #000 90%);
  mix-blend-mode: luminosity;
  filter: brightness(.6) contrast(4);
}

.card__glare {
  z-index: 4;
  overflow: hidden;
  opacity: calc(var(--card-opacity) * .8);
  background: radial-gradient(farthest-corner circle at var(--mx) var(--my),
    hsla(0, 0%, 100%, .8) 10%, hsla(0, 0%, 100%, .65) 20%, hsla(0, 0%, 0%, .5) 90%);
  mix-blend-mode: overlay;
  /* Keep the glare in the card's native compositing group. iOS WebKit
     color-shifts filtered blend layers at DPR 3. */
  filter: none;
}

.card__glare-secondary {
  z-index: 4;
  opacity: calc(var(--card-opacity) * .34);
  background-image:
    radial-gradient(farthest-corner circle at var(--mx) var(--my),
      rgba(255,255,255,.62) 0%, rgba(255,255,255,.2) 18%,
      rgba(255,255,255,0) 48%, rgba(255,255,255,.1) 68%,
      rgba(255,255,255,0) 100%),
    linear-gradient(90deg,
      transparent 24%, rgba(205,240,255,.08) 39%,
      rgba(255,255,255,.34) 50%, rgba(220,245,255,.08) 61%, transparent 76%),
    linear-gradient(0deg,
      transparent 24%, rgba(205,240,255,.08) 39%,
      rgba(255,255,255,.34) 50%, rgba(220,245,255,.08) 61%, transparent 76%);
  background-size: 100% 100%, 220% 100%, 100% 220%;
  background-position:
    center,
    var(--mx) center,
    center var(--my);
  background-repeat: no-repeat;
  mix-blend-mode: normal;
  filter: none;
}


.motion-button {
  margin-top: 24px;
  padding: 11px 16px;
  border: 1px solid rgba(132,177,255,.35);
  border-radius: 999px;
  color: #dceaff;
  background: rgba(12,31,63,.62);
  backdrop-filter: blur(14px);
  cursor: pointer;
}
.motion-button:hover { background: rgba(23,55,106,.75); }
.motion-button[hidden] { display: none; }
.status { min-height: 16px; margin: 10px 0 0; color: #62718b; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }

@media (hover: hover) and (pointer: fine) { .motion-button { display: none; } }
@media (max-height: 760px) and (min-width: 701px) { .card-wrap { width: min(54vw, 295px); } .instructions { margin-bottom: 14px; } }
@media (max-width: 700px) {
  .stage { padding-inline: 10px; overflow-y: auto; }
  .demo { width: 100%; }
  .card-wrap { width: min(92vw, 430px); }
}
@media (prefers-reduced-motion: reduce) { .card { transition: none; } }