:root {
  --bg-1: #101625;
  --bg-2: #1e2f52;
  --text: #eef3ff;
  --accent: #ffce4a;
  --accent-2: #ff6fae;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, #273e68, var(--bg-1) 55%);
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}

.page {
  --fade-progress: 0;
  position: relative;
  height: 100vh;
  height: 100svh;
  overflow: hidden;
}

.panel {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: max(1.25rem, env(safe-area-inset-top)) max(1.25rem, env(safe-area-inset-right))
    max(1.25rem, env(safe-area-inset-bottom)) max(1.25rem, env(safe-area-inset-left));
}

.panel--start {
  background: #000;
  z-index: 1;
  opacity: calc(1 - var(--fade-progress));
  transform: scale(calc(1 - (var(--fade-progress) * 0.02)));
}

.panel--puzzle {
  background: linear-gradient(180deg, #121b30, #0b0f1b);
  z-index: 2;
  opacity: var(--fade-progress);
  transform: scale(calc(1.03 - (var(--fade-progress) * 0.03)));
  pointer-events: none;
}

.page.puzzle-ready .panel--start {
  pointer-events: none;
}

.page.puzzle-ready .panel--puzzle {
  pointer-events: auto;
}

.image-button {
  border: none;
  background: transparent;
  padding: 0;
  cursor: pointer;
  width: min(90vw, 540px);
  aspect-ratio: 3 / 2;
  border-radius: 1.2rem;
  overflow: hidden;
  box-shadow: 0 25px 55px rgba(0, 0, 0, 0.5);
  transition: transform 240ms ease, box-shadow 240ms ease;
}

.image-button:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 35px 75px rgba(0, 0, 0, 0.6);
}

.slideshow-stack {
  position: relative;
  width: 100%;
  height: 100%;
}

.slideshow-frame {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1400ms ease-in-out;
}

.slideshow-frame.is-visible {
  opacity: 1;
}

.gift {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 10;
  padding: max(1rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right))
    max(1rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
}

.gift.hidden {
  display: none;
}

.gift__glow {
  position: absolute;
  width: min(80vw, 780px);
  height: min(80vw, 780px);
  background: radial-gradient(circle, rgba(255, 206, 74, 0.28), rgba(255, 111, 174, 0.1), transparent 70%);
  filter: blur(4px);
  animation: pulse 2.2s ease-in-out infinite;
}

.gift__card {
  position: relative;
  max-width: 52rem;
  width: min(92vw, 52rem);
  text-align: center;
  padding: clamp(1.6rem, 3vw, 3rem);
  border-radius: 1.2rem;
  background: linear-gradient(145deg, rgba(24, 34, 61, 0.97), rgba(49, 20, 63, 0.95));
  border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 25px 90px rgba(0, 0, 0, 0.65), inset 0 0 80px rgba(255, 255, 255, 0.06);
}

.gift__card h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.6rem, 2.8vw, 2.8rem);
}

.gift__card p {
  margin: 0;
  font-size: clamp(1rem, 1.8vw, 1.35rem);
  line-height: 1.5;
}

@media (max-width: 430px) {
  .image-button {
    width: min(94vw, 420px);
    border-radius: 1rem;
  }

  .gift__card {
    width: min(95vw, 36rem);
    border-radius: 1rem;
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(0.96);
    opacity: 0.7;
  }
  50% {
    transform: scale(1.02);
    opacity: 1;
  }
}