:root {
  --bg-top: #26163d;
  --bg-bottom: #0d0919;
  --panel: rgba(23, 18, 46, 0.9);
  --panel-border: rgba(255, 227, 155, 0.32);
  --cream: #fff3d6;
  --peach: #ffbc8d;
  --gold: #ffd45a;
  --pink: #ff7999;
  --mint: #97f0d3;
  --shadow: rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: "Nunito", sans-serif;
  color: var(--cream);
  background:
    radial-gradient(circle at top, rgba(255, 143, 112, 0.18), transparent 30%),
    radial-gradient(circle at 80% 20%, rgba(133, 223, 255, 0.18), transparent 20%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 50%, transparent 50%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 50%, transparent 50%);
  background-size: 8px 8px;
  opacity: 0.22;
  pointer-events: none;
}

.page-shell {
  width: min(100%, 34rem);
  margin: 0 auto;
  padding: clamp(1rem, 4vw, 1.5rem);
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  gap: 0.9rem;
  position: relative;
}

.hero-copy,
.notes,
.ui-layer,
.swipe-hint {
  position: relative;
  z-index: 1;
}

.hero-copy {
  padding: 1rem 1rem 0.4rem;
}

.eyebrow {
  margin: 0 0 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.68rem;
  color: var(--mint);
}

h1 {
  margin: 0;
  font-family: "Press Start 2P", monospace;
  font-size: clamp(1.15rem, 4vw, 1.65rem);
  line-height: 1.45;
  text-wrap: balance;
}

.lede,
.notes p {
  margin: 0;
  line-height: 1.45;
  color: rgba(255, 243, 214, 0.88);
}

.ui-layer {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0 1rem;
}

.ui-button {
  border: 2px solid rgba(255, 243, 214, 0.7);
  background: rgba(42, 27, 64, 0.92);
  color: var(--cream);
  font: inherit;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: lowercase;
  padding: 0.72rem 1rem;
  border-radius: 999px;
  box-shadow: 0 10px 24px var(--shadow);
}

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

.ui-button.accent {
  background: linear-gradient(180deg, #ff9a74, #ff6b8a);
  color: #2a1638;
  border-color: rgba(255, 242, 224, 0.85);
}

.swipe-hint {
  margin-top: 0.7rem;
  padding: 0 1rem;
  color: rgba(255, 243, 214, 0.72);
  font-size: 0.85rem;
}

.swipe-hint span::after {
  content: "  ↔";
  color: var(--gold);
}

.scene-viewport {
  position: relative;
  z-index: 1;
  min-height: 0;
}

.scene-ui {
  position: absolute;
  top: 0.85rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  pointer-events: none;
}

.confetti-button {
  pointer-events: auto;
}

.scene-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  border-radius: 1.4rem;
  border: 1px solid var(--panel-border);
  background:
    linear-gradient(180deg, rgba(255, 212, 90, 0.08), transparent),
    var(--panel);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 22px 50px rgba(0, 0, 0, 0.34);
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.scene-scroll::-webkit-scrollbar {
  height: 10px;
}

.scene-scroll::-webkit-scrollbar-thumb {
  background: rgba(255, 243, 214, 0.18);
  border-radius: 999px;
}

.scene-track {
  width: max-content;
  scroll-snap-align: start;
}

#birthdayCanvas {
  display: block;
  width: auto;
  height: min(58vh, 34rem);
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.notes {
  padding: 0 1rem 1.2rem;
  display: grid;
  gap: 0.55rem;
}

.music-note a {
  color: var(--peach);
}

.birthday-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: 1.4rem;
  background: rgba(12, 8, 24, 0.2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease;
  z-index: 5;
}

.birthday-overlay.visible {
  opacity: 1;
}

.overlay-card {
  min-width: min(82vw, 18rem);
  text-align: center;
  padding: 1rem 1.2rem;
  border-radius: 1rem;
  border: 1px solid rgba(255, 242, 224, 0.5);
  background: rgba(32, 18, 49, 0.95);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.3);
}

.overlay-card p {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mint);
}

.overlay-card strong {
  display: block;
  margin-top: 0.45rem;
  font-family: "Press Start 2P", monospace;
  line-height: 1.5;
  font-size: 1.1rem;
}

@media (prefers-reduced-motion: reduce) {
  .birthday-overlay {
    transition: none;
  }
}