:root {
  --bg: #111119;
  --bg-2: #1b1822;
  --paper-red: #d43c49;
  --paper-red-dark: #a92035;
  --paper-red-light: #ec5964;
  --ribbon: #f2c14e;
  --ribbon-dark: #c9901f;
  --cream: #fff7e8;
  --ink: #231f2a;
  --muted: #aaa3b4;
  --accent: #79d8ff;
  --accent-2: #b8f1ff;
  --card-shadow: 0 30px 90px rgba(0, 0, 0, .45);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at 20% 0%, rgba(112, 61, 126, .18), transparent 35%),
    radial-gradient(circle at 80% 20%, rgba(55, 94, 151, .15), transparent 35%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
  color: white;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
}

button,
canvas {
  -webkit-tap-highlight-color: transparent;
}

.background-stars,
.background-stars::before,
.background-stars::after {
  position: fixed;
  inset: 0;
  pointer-events: none;
  content: "";
  background-image:
    radial-gradient(circle, rgba(255,255,255,.75) 0 1px, transparent 1.5px),
    radial-gradient(circle, rgba(255,255,255,.4) 0 1px, transparent 1.5px);
  background-size: 90px 90px, 140px 140px;
  background-position: 10px 20px, 40px 75px;
  opacity: .16;
}

.background-stars::before {
  transform: translate3d(25px, 10px, 0);
  opacity: .25;
}

.background-stars::after {
  transform: translate3d(-35px, 30px, 0);
  opacity: .12;
}

.page-shell {
  width: min(960px, calc(100% - 28px));
  margin: 0 auto;
  min-height: 100vh;
  display: grid;
  align-content: center;
  gap: 26px;
  padding: 54px 0 60px;
}

.intro {
  text-align: center;
  position: relative;
  z-index: 3;
}

.eyebrow {
  margin: 0 0 8px;
  letter-spacing: .24em;
  font-size: .73rem;
  font-weight: 800;
  color: #f1d58a;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4.3rem);
  line-height: .98;
  letter-spacing: -.04em;
}

.subtitle {
  max-width: 620px;
  margin: 16px auto 0;
  color: #c3bdca;
  font-size: clamp(.95rem, 2vw, 1.1rem);
}

.gift-stage {
  display: grid;
  justify-items: center;
  position: relative;
  padding-top: 14px;
}

.glow {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  filter: blur(65px);
  pointer-events: none;
  opacity: .15;
}

.glow-one {
  background: #ff5060;
  transform: translate(-170px, 60px);
}

.glow-two {
  background: #65d8ff;
  transform: translate(180px, 100px);
}

.gift-card {
  width: min(580px, 92vw);
  aspect-ratio: 1.25 / 1;
  border-radius: 28px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transform-origin: center;
  user-select: none;
  touch-action: none;
  background: var(--cream);
  isolation: isolate;
}

.gift-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.3);
  pointer-events: none;
  z-index: 9;
}

.gift-card.bump {
  animation: bump .38s ease;
}

@keyframes bump {
  0%, 100% { transform: scale(1); }
  48% { transform: scale(1.018) rotate(-.4deg); }
}

.gift-inner {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 50% 15%, rgba(121,216,255,.34), transparent 32%),
    linear-gradient(160deg, #fffaf0, #f6ead3);
}

.reveal-panel {
  width: min(84%, 460px);
  text-align: center;
  color: var(--ink);
  position: relative;
  opacity: .96;
}

.reveal-kicker {
  margin: 12px 0 0;
  font-weight: 900;
  letter-spacing: .16em;
  font-size: .76rem;
  color: #927329;
}

.reveal-panel h2 {
  margin: 6px 0 12px;
  font-size: clamp(1.2rem, 4vw, 2rem);
}

.reward-amount {
  display: grid;
  justify-items: center;
  line-height: .9;
  margin: 8px 0 14px;
}

.reward-amount > span {
  font-size: clamp(3rem, 10vw, 5.3rem);
  font-weight: 950;
  letter-spacing: -.06em;
  background: linear-gradient(180deg, #55cbff, #5577ff 72%, #7656d9);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 5px 10px rgba(89,132,230,.25));
}

.reward-amount small {
  margin-top: 8px;
  letter-spacing: .2em;
  font-weight: 900;
  color: #5d6376;
}

.birthday-message {
  margin: 0 auto 16px;
  max-width: 420px;
  color: #625d66;
  line-height: 1.45;
  font-size: .96rem;
}

.claim-button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 13px 24px;
  font: inherit;
  font-weight: 900;
  color: #1d2834;
  background: linear-gradient(180deg, #b9f2ff, #73d8ff);
  box-shadow: 0 9px 24px rgba(65, 157, 205, .28);
  cursor: pointer;
  transform: translateY(0);
  transition: transform .16s ease, box-shadow .16s ease;
}

.claim-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(65, 157, 205, .35);
}

.claim-button:active {
  transform: translateY(1px);
}

.claim-result {
  min-height: 1.2em;
  margin: 10px 0 0;
  font-size: .9rem;
  color: #4e5261;
  font-weight: 700;
}

.gem {
  width: 60px;
  height: 68px;
  margin: 0 auto;
  position: relative;
  filter: drop-shadow(0 8px 10px rgba(64, 146, 214, .25));
  transform: rotate(45deg);
}

.gem::before,
.gem::after,
.gem-core {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 13px 4px 13px 4px;
}

.gem::before {
  inset: 0;
  background: linear-gradient(135deg, #dcfbff, #6bddff 52%, #5e73f0);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.gem::after {
  inset: 7px;
  background: rgba(255,255,255,.32);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.gem-core {
  inset: 18px;
  background: rgba(255,255,255,.9);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.sparkle-ring span {
  position: absolute;
  color: #78cffa;
  font-size: 1.25rem;
  animation: floaty 2.3s ease-in-out infinite;
}

.sparkle-ring span:nth-child(1) { left: 14%; top: 2%; }
.sparkle-ring span:nth-child(2) { right: 17%; top: 12%; animation-delay: -.8s; }
.sparkle-ring span:nth-child(3) { left: 10%; bottom: 12%; animation-delay: -1.3s; }
.sparkle-ring span:nth-child(4) { right: 10%; bottom: 18%; animation-delay: -.4s; }

@keyframes floaty {
  50% { transform: translateY(-7px) rotate(12deg); opacity: .5; }
}

#paperCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 4;
  cursor: grab;
}

#paperCanvas:active {
  cursor: grabbing;
}

.ribbon {
  position: absolute;
  z-index: 5;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(255,255,255,.2), transparent 25% 75%, rgba(0,0,0,.1)),
    var(--ribbon);
  box-shadow: inset 0 0 0 1px rgba(105, 73, 8, .12);
  transition: opacity .35s ease, transform .35s ease;
}

.ribbon-vertical {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 68px;
  transform: translateX(-50%);
}

.ribbon-horizontal {
  left: 0;
  right: 0;
  top: 50%;
  height: 68px;
  transform: translateY(-50%);
}

.bow {
  position: absolute;
  z-index: 6;
  left: 50%;
  top: 50%;
  width: 170px;
  height: 92px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  transition: opacity .3s ease, transform .3s ease;
}

.bow-knot {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: linear-gradient(145deg, #ffe08a, var(--ribbon-dark));
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  box-shadow: inset -5px -7px 9px rgba(95,61,0,.14), 0 7px 18px rgba(78,48,0,.23);
}

.bow-loop {
  position: absolute;
  top: 14px;
  width: 82px;
  height: 58px;
  border: 20px solid var(--ribbon);
  border-radius: 60% 40% 55% 45%;
  box-shadow: inset 0 0 0 1px rgba(105,73,8,.08);
}

.bow-left {
  left: 2px;
  transform: rotate(-18deg);
}

.bow-right {
  right: 2px;
  transform: rotate(18deg) scaleX(-1);
}

.gift-card.first-tear .bow {
  opacity: 0;
  transform: translate(-50%, -50%) scale(.65) rotate(14deg);
}

.gift-card.first-tear .ribbon {
  opacity: 0;
}

.tear-ui {
  width: min(580px, 92vw);
  margin-top: 18px;
  transition: opacity .4s ease, transform .4s ease;
}

.tear-ui.hidden {
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
}

.tear-copy {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: #d7d2db;
  font-size: .92rem;
}

.tear-copy span {
  color: #9b95a3;
  white-space: nowrap;
}

.progress-track {
  height: 9px;
  margin-top: 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.05);
}

.progress-fill {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, #ef5d68, #f6c85d);
  transition: width .18s ease;
}

.hint {
  margin: 10px 0 0;
  color: #817b88;
  font-size: .78rem;
}

.confetti-layer {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 999;
}

.confetti {
  position: absolute;
  top: -24px;
  width: 10px;
  height: 16px;
  border-radius: 2px;
  animation: confetti-fall var(--duration) linear forwards;
}

@keyframes confetti-fall {
  to {
    transform: translate3d(var(--drift), 110vh, 0) rotate(var(--spin));
  }
}

.gift-card.complete {
  animation: reveal-pop .8s cubic-bezier(.2,.85,.28,1.2);
}

@keyframes reveal-pop {
  0%   { transform: scale(1); }
  35%  { transform: scale(1.035); }
  65%  { transform: scale(.985); }
  100% { transform: scale(1); }
}

.gift-card.complete #paperCanvas {
  pointer-events: none;
  animation: paper-out .7s ease forwards;
}

@keyframes paper-out {
  to { opacity: 0; transform: scale(1.04); }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 18px, 960px);
    padding: 34px 0 44px;
    gap: 20px;
  }

  .gift-card {
    border-radius: 22px;
    aspect-ratio: 1 / 1.12;
  }

  .ribbon-vertical {
    width: 54px;
  }

  .ribbon-horizontal {
    height: 54px;
  }

  .bow {
    transform: translate(-50%, -50%) scale(.82);
  }

  .tear-copy {
    font-size: .82rem;
  }

  .birthday-message {
    font-size: .86rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}