:root {
  color-scheme: light;
  --ink: #1e1917;
  --paper: #f7dfd8;
  --button: rgba(255, 250, 247, 0.88);
  --button-border: rgba(60, 37, 31, 0.18);
  --shadow: rgba(32, 17, 12, 0.28);
  --flap-y: 48.766%;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  color: var(--ink);
  background: #191210;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button {
  font: inherit;
}

.stage-shell {
  min-height: 100vh;
}

.stage {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  isolation: isolate;
  display: grid;
  place-items: center;
  background: #d4b196;
}

.backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.96) brightness(1.03);
  transform: scale(1.02);
}

.stage::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(circle at 50% 43%, rgba(255, 255, 255, 0.72), transparent 38%),
    linear-gradient(180deg, rgba(41, 24, 17, 0.06), rgba(41, 24, 17, 0.18));
  pointer-events: none;
}

.scene {
  position: relative;
  z-index: 2;
  width: min(92vw, 980px);
  height: min(88vh, 760px);
  min-height: 580px;
  perspective: 1400px;
}

.envelope-rig,
.final-card {
  position: absolute;
  left: 50%;
  top: 50%;
  will-change: transform, opacity;
}

.envelope-rig {
  width: min(48vh, 430px);
  aspect-ratio: 712.75 / 1000.39;
  transform-origin: 50% 58%;
  transform: translate(-50%, -50%) translateY(-28%) scale(1.2);
}

.final-card {
  z-index: 5;
  width: min(43vh, 384px);
  height: auto;
  opacity: 0;
  filter: drop-shadow(0 22px 36px rgba(25, 14, 10, 0.22));
  transform-origin: center center;
  user-select: none;
  pointer-events: none;
}

.envelope-layer,
.envelope-card,
.front-flap-shadow,
.ground-shadow {
  position: absolute;
  user-select: none;
  pointer-events: none;
  will-change: transform, opacity;
}

.envelope-layer {
  inset: 0;
  background-position: center;
  background-repeat: no-repeat;
  background-size: 100% 100%;
  backface-visibility: hidden;
}

.envelope-back-base {
  z-index: 2;
  background-image: url("./assets/envelope-design.png");
  background-size: 100% 110%;
  background-position: center bottom;
  clip-path: inset(var(--flap-y) 0 26% 0);
  filter: drop-shadow(0 22px 34px rgba(38, 22, 14, 0.22));
}

.envelope-liner {
  z-index: 3;
  background-image: url("./assets/envelope-liner-layer.svg");
  clip-path: inset(0 0 26% 0);
  opacity: 0;
}

.envelope-back-cover {
  z-index: 5;
  background-image: url("./assets/envelope-cover-layer.svg");
  filter: drop-shadow(0 -2px 2px rgba(61, 34, 26, 0.06));
}

.envelope-front-base {
  z-index: 4;
  background-image: url("./assets/envelope-front-layer.svg");
  clip-path: inset(var(--flap-y) 0 0 0);
  transform: rotateY(180deg);
}

.envelope-card {
  left: 50%;
  top: 50%;
  z-index: 4;
  width: 84%;
  aspect-ratio: 1060 / 1484;
  transform-origin: 50% 50%;
  opacity: 0;
  transform: translate3d(-50%, -50%, 0) translateY(24%) rotate(-90deg) scale(0.68);
  background-image: url("./paperlesspost-assets/card-front.png?v=4");
  background-size: 101% 101%;
  background-position: center;
  box-shadow: 0 16px 28px rgba(25, 14, 10, 0.18);
}

.envelope-flap {
  z-index: 7;
  clip-path: inset(0 0 calc(100% - var(--flap-y)) 0);
  transform-origin: 50% var(--flap-y);
  filter: drop-shadow(0 8px 9px rgba(66, 38, 26, 0.12));
}

.envelope-back-flap {
  z-index: 2;
  background-image: url("./assets/envelope-back-layer.svg");
  opacity: 1;
  transform: translateZ(-0.4px) translateY(0.03%) rotateX(132.5deg);
}

.envelope-back-flap::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("./assets/envelope-design.png");
  background-size: 100% 110%;
  background-position: center bottom;
  background-repeat: no-repeat;
  -webkit-mask-image: url("./assets/envelope-liner-layer.svg");
  mask-image: url("./assets/envelope-liner-layer.svg");
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  pointer-events: none;
}

.envelope-front-flap {
  z-index: 8;
  background-image: url("./assets/envelope-front-layer.svg");
  transform: translateZ(-0.4px) translateY(-0.25%) rotateY(180deg) rotateX(132deg);
}

.front-flap-shadow {
  inset: 0;
  z-index: 6;
  background: rgba(0, 0, 0, 0.13);
  clip-path: polygon(0 0, 2% 90%, 45% 4%, 50% 0%, 55% 4%, 98% 90%, 100% 100%, 0 100%);
  transform-origin: 50% var(--flap-y);
  transform: translateZ(-0.4px) rotateX(132deg);
  opacity: 0;
  filter: blur(6px);
  mix-blend-mode: multiply;
}

.ground-shadow {
  left: 50%;
  bottom: -4%;
  z-index: 1;
  width: 84%;
  height: 20%;
  border-radius: 999px;
  background: radial-gradient(ellipse at center, var(--shadow), transparent 70%);
  filter: blur(8px);
  transform: translateX(-50%);
  opacity: 0.38;
}

.credit {
  position: absolute;
  top: max(28px, env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
  text-align: center;
}

.credit-label {
  position: relative;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: rgba(60, 37, 31, 0.44);
  padding: 0 14px;
}

.credit-label::before,
.credit-label::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 18px;
  height: 1px;
  background: rgba(60, 37, 31, 0.28);
}

.credit-label::before {
  right: calc(100% + 2px);
}

.credit-label::after {
  left: calc(100% + 2px);
}

.credit-name {
  font-family: "Cormorant Garamond", "Didot", "Bodoni 72", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  font-size: 17px;
  line-height: 1;
  letter-spacing: 0.015em;
  color: rgba(60, 37, 31, 0.78);
}

.replay {
  position: absolute;
  right: max(22px, env(safe-area-inset-right));
  bottom: max(22px, env(safe-area-inset-bottom));
  z-index: 5;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--button-border);
  border-radius: 50%;
  color: var(--ink);
  background: var(--button);
  box-shadow: 0 14px 34px rgba(31, 19, 14, 0.2);
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity 180ms ease,
    transform 180ms ease,
    background 180ms ease;
  backdrop-filter: blur(14px);
}

.replay svg {
  width: 20px;
  height: 20px;
  margin-left: 2px;
}

.replay:hover,
.replay:focus-visible {
  background: rgba(255, 255, 255, 0.96);
  transform: translateY(4px);
}

.replay:focus-visible {
  outline: 3px solid rgba(105, 72, 62, 0.34);
  outline-offset: 3px;
}

.is-complete .replay {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 760px) {
  .scene {
    width: 100vw;
    height: 100vh;
    min-height: 620px;
  }

  .envelope-rig {
    width: min(58vh, 82vw);
  }

  .final-card {
    width: min(52vh, 74vw);
  }

  .replay {
    right: max(14px, env(safe-area-inset-right));
    bottom: max(14px, env(safe-area-inset-bottom));
  }
}

@media (prefers-reduced-motion: reduce) {
  .envelope-rig,
  .envelope-card,
  .envelope-layer,
  .final-card,
  .front-flap-shadow,
  .ground-shadow {
    transition: none;
  }
}