/* ============================================================
   Stamps
   ============================================================ */
.stamp {
  position: absolute;
  left: 50%;
  top: 50%;
  /* The pile makes passes taller (book-shaped) where it has room: see .deck .stamp. */
  --sh: calc(var(--sw) * 1.38);
  width: var(--sw);
  height: var(--sh);
  margin: calc(var(--sh) * -0.5 - 8px) 0 0 calc(var(--sw) * -0.5);
  perspective: 1400px;
  -webkit-user-select: none;
  user-select: none;
  will-change: transform;
  cursor: grab;
}
.stamp-shadow {
  position: absolute;
  inset: 8% 6% -2%;
  border-radius: 30%;
  /* a soft shadow drawn as a gradient (a live blur filter re-renders as cards move) */
  background: radial-gradient(closest-side, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.25) 60%, transparent);
  transform: translateY(10px);
  transition: transform 0.4s var(--ease), opacity 0.4s;
  pointer-events: none;
}
.stamp.lifted {
  cursor: grabbing;
}
.stamp.lifted .stamp-shadow {
  transform: translateY(30px) scale(1.05);
  opacity: 0.8;
}
.flipper {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 0.8s var(--spring);
}
.stamp.flipped .flipper {
  transform: rotateY(180deg);
}
.face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.face.back {
  transform: rotateY(180deg);
}
/* The face turned away is hidden outright, halfway through the flip: Safari draws some things
   (the red READ stamp's ink blend, for one) through backface-visibility, mirrored. */
.face {
  transition: visibility 0s 0.18s;
}
.stamp:not(.flipped) .face.back,
.stamp.flipped .face.front {
  visibility: hidden;
}
.paper {
  --hole: 5px;
  --step: 14px;
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 15px 15px 13px;
  background: var(--paper);
  color: var(--ink);
  /* perforated edge: holes along the border, solid in the middle */
  -webkit-mask:
    radial-gradient(circle var(--hole) at calc(var(--step) / 2) calc(var(--step) / 2), #0000 98%, #000) calc(var(--step) / -2) calc(var(--step) / -2) / var(--step) var(--step) round,
    linear-gradient(#000 0 0) center / calc(100% - var(--step)) calc(100% - var(--step)) no-repeat;
  mask:
    radial-gradient(circle var(--hole) at calc(var(--step) / 2) calc(var(--step) / 2), #0000 98%, #000) calc(var(--step) / -2) calc(var(--step) / -2) / var(--step) var(--step) round,
    linear-gradient(#000 0 0) center / calc(100% - var(--step)) calc(100% - var(--step)) no-repeat;
}
.stamp-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  min-height: 0;
}
.denom {
  display: inline-flex;
  align-items: flex-start;
  gap: 1px;
  line-height: 0.8;
}
.denom b {
  font: 900 calc(var(--sw) * 0.2) / 0.8 var(--display);
  font-stretch: 62%;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.denom b.emo {
  font-size: calc(var(--sw) * 0.13);
  line-height: 1;
}
.denom small {
  font: 700 11px/1 var(--mono);
  margin-top: 2px;
}
.issuer {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  font: 700 9px/1.2 var(--mono);
  letter-spacing: 0.14em;
}
.issuer small {
  font-weight: 400;
}
.win {
  position: relative;
  flex: 1;
  min-height: 0;
  background: var(--cbg, #222);
  overflow: hidden;
  perspective: 700px;
  box-shadow: 0 0 0 2px var(--ink);
}
.lid {
  position: absolute;
  inset: 0;
  transform-origin: 50% 0;
  transition: transform 0.9s var(--spring);
  backface-visibility: hidden;
}
.stamp.peek .lid {
  transform: rotateX(80deg);
}
.leaf {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 12%;
  text-align: center;
  background: repeating-linear-gradient(var(--paper) 0 18px, #e2dccd 18px 19px);
  color: var(--ink);
}
.leaf small {
  font: 700 9px/1 var(--mono);
  letter-spacing: 0.24em;
  color: var(--c1);
  -webkit-text-stroke: 0.3px var(--ink);
}
.leaf b {
  font: 900 calc(var(--sw) * 0.1) / 0.95 var(--display);
  font-stretch: 70%;
  text-transform: uppercase;
}
.pic {
  position: absolute;
  inset: 0;
}
.pic .art,
.pic img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.pic img {
  opacity: 0;
  transform: scale(1.08);
  transition: opacity 0.6s var(--ease), transform 0.9s var(--ease);
}
.pic img.in {
  opacity: 1;
  transform: none;
}
.pic-title {
  position: absolute;
  left: 9%;
  right: 9%;
  bottom: 8%;
  /* --fit shrinks long titles so they fit whole (js/stamp.js titleFit) */
  font: 900 calc(var(--sw) * 0.115 * var(--fit, 1)) / 0.9 var(--display);
  font-stretch: 62%;
  text-transform: uppercase;
  color: #fff;
  text-shadow: 0 2px 0 rgba(0, 0, 0, 0.35);
  display: -webkit-box;
  -webkit-line-clamp: 6;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.liquid {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.pg {
  position: absolute;
  left: 6px;
  bottom: calc(var(--lvl, 0) * 100%);
  transform: translateY(-6px);
  padding: 3px 5px 2px;
  font: 10px/1 var(--pixel);
  background: var(--ink);
  color: var(--lcd-ink);
  border-radius: 4px;
  opacity: 0;
  transition: bottom 0.5s var(--spring), opacity 0.3s;
}
.stamp.top.reading .pg {
  opacity: 1;
}
.stamp.scrubbing .pg {
  transition: opacity 0.3s;
  transform: translateY(-6px) scale(1.25);
  transform-origin: left bottom;
}
.cap {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-height: 0;
}
.cap b {
  font: 900 calc(var(--sw) * 0.088 * max(var(--fit, 1), 0.7)) / 0.92 var(--display);
  font-stretch: 66%;
  text-transform: uppercase;
  letter-spacing: 0.005em;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.cap small {
  font: 400 10px/1.1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.book-fx {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
}

/* Postmark on finished books */
.postmark {
  position: absolute;
  right: -6%;
  top: 30%;
  display: flex;
  align-items: center;
  transform: rotate(-16deg);
  pointer-events: none;
  mix-blend-mode: multiply; /* ink soaked into the card (a small element, so cheap) */
  color: #c4122f;
  z-index: 4;
}
.pm-ring {
  width: calc(var(--sw) * 0.36);
  height: calc(var(--sw) * 0.36);
  border: 3px solid currentColor;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.35);
  font: 700 8px/1.15 var(--mono);
  letter-spacing: 0.1em;
}
.pm-ring b {
  font: 900 15px/1 var(--display);
  font-stretch: 70%;
  letter-spacing: 0;
}
.pm-waves {
  width: calc(var(--sw) * 0.4);
  height: calc(var(--sw) * 0.22);
  margin-left: -6px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 80 44'%3E%3Cg fill='none' stroke='%23c4122f' stroke-width='3'%3E%3Cpath d='M0 6q10-6 20 0t20 0 20 0 20 0'/%3E%3Cpath d='M0 17q10-6 20 0t20 0 20 0 20 0'/%3E%3Cpath d='M0 28q10-6 20 0t20 0 20 0 20 0'/%3E%3Cpath d='M0 39q10-6 20 0t20 0 20 0 20 0'/%3E%3C/g%3E%3C/svg%3E") center / 100% 100% no-repeat;
}
.stamp.top .postmark {
  animation: thunk 0.55s cubic-bezier(0.2, 1.6, 0.4, 1) 0.15s both;
}
@keyframes thunk {
  from { transform: rotate(-30deg) scale(2.2); opacity: 0; }
}

/* Back of the stamp */
.back .paper {
  gap: 6px;
  padding: 20px 20px 16px;
  overflow: hidden;
}
.back-title {
  flex: none;
  font: 900 calc(var(--sw) * 0.1 * var(--fit-back, 1)) / 0.92 var(--display);
  font-stretch: 66%;
  text-transform: uppercase;
}
.back-by {
  font: 400 10px/1.2 var(--mono);
  text-transform: uppercase;
}
.facts {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 10px;
  margin: 6px 0 2px;
  padding: 8px 0;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  font: 400 10px/1.35 var(--mono);
}
.facts dt {
  font-weight: 700;
  letter-spacing: 0.08em;
}
.facts dd {
  margin: 0;
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* The blurb takes whatever room is left, and fades out if it runs over; everything else on the
   back keeps its size, so the Amazon button and the hint are never cut off. */
.blurb {
  flex: 1 1 0;
  min-height: 0;
  margin: 0;
  position: relative;
  font: 400 10px/1.35 var(--mono);
  overflow: hidden;
}
/* (a fade painted in the ticket's colour, not a mask: masks cost a pass on every frame the card moves) */
.blurb::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 2.7em;
  background: linear-gradient(transparent, var(--stock, var(--white)));
}
.back .paper > :not(.blurb) {
  flex: none;
}
.back-hint {
  margin-top: auto;
  font: 9px/1 var(--pixel);
  opacity: 0.6;
}

/* The + stamp */
.stamp.add .paper {
  background: var(--ink);
  color: var(--white);
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 10px;
}
.plus {
  position: relative;
  width: calc(var(--sw) * 0.42);
  height: calc(var(--sw) * 0.42);
  margin-bottom: 8px;
  transform: scale(calc(1 + var(--pull, 0) * 0.35)) rotate(calc(var(--pull, 0) * 90deg));
  transition: transform 0.2s;
}
.plus i {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 100%;
  height: 26%;
  margin: -13% 0 0 -50%;
  background: var(--lime);
  border-radius: 6px;
  box-shadow: 0 0 22px rgba(231, 255, 61, 0.55);
}
.plus i + i {
  transform: rotate(90deg);
}
.stamp.add.top .plus {
  animation: plus-breathe 2.4s var(--bounce) infinite;
}
@keyframes plus-breathe {
  0%, 70%, 100% { scale: 1; }
  80% { scale: 1.12; rotate: 8deg; }
}
.add-word {
  font: 900 calc(var(--sw) * 0.13) / 0.9 var(--display);
  font-stretch: 62%;
}
.add-sub {
  font: 9px/1 var(--pixel);
  color: var(--lime);
  letter-spacing: 0.06em;
}

/* Generated art moves only on the stamp on top */
.art * {
  animation-play-state: paused !important;
}
.stamp.top.alive .art *,
.poster .art * {
  animation-play-state: running !important;
}
.fx-float { animation: f-float 4s ease-in-out infinite alternate; }
@keyframes f-float {
  to { transform: translateY(-12px); }
}
.fx-sway { animation: f-sway 6s ease-in-out infinite alternate; }
@keyframes f-sway {
  from { transform: rotate(-6deg) scale(0.98); }
  to { transform: rotate(6deg) scale(1.04); }
}
.fx-spin { animation: f-spin 18s linear infinite; }
.fx-spin.s1 { animation-direction: reverse; animation-duration: 24s; }
@keyframes f-spin {
  to { transform: rotate(360deg); }
}
.fx-slide { animation: f-slide 6s linear infinite; }
@keyframes f-slide {
  to { transform: translateX(78px); }
}
.fx-pulse { animation: f-pulse 3s ease-in-out infinite; }
@keyframes f-pulse {
  50% { transform: scale(1.14); }
}

/* Easter egg overlays */
.egg {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  container-type: inline-size;
}
.egg svg { width: 60%; }
.egg-eye svg { width: 80%; filter: drop-shadow(0 0 20px #e01e37); }
.egg-bolt svg { filter: drop-shadow(0 0 18px #ffe14d); }
.egg-ring svg { width: 90%; filter: drop-shadow(0 0 16px #ffb81f); }
.egg-glow {
  inset: -20%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61, 255, 176, 0.9), rgba(61, 255, 176, 0) 60%);
  mix-blend-mode: screen;
}
.egg-text span {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #fff;
  text-shadow: 0 4px 0 #000;
}
.egg-text b {
  font: 900 46cqw/0.85 var(--display);
  font-stretch: 62%;
}
.egg-text small {
  font: 9px/1 var(--pixel);
  background: var(--lime);
  color: #000;
  padding: 4px 6px;
  text-shadow: none;
}
.egg-wave {
  inset: auto -10% -5%;
  height: 70%;
  background: linear-gradient(transparent, rgba(37, 199, 255, 0.9) 30%, rgba(43, 59, 255, 0.95));
  border-radius: 45% 55% 0 0 / 30% 30% 0 0;
}
.egg-lens span {
  font-size: 40cqw;
  filter: drop-shadow(0 6px 10px rgba(0, 0, 0, 0.5));
}

/* Grain on the generated art: the one shared texture, tiled (no SVG noise filter per card) */
.art-grain {
  position: absolute;
  inset: 0;
  background: var(--grain-art, none);
  background-size: 96px;
  pointer-events: none;
}