:root {
  --bg: #e8edf5;
  --panel: #cfd8e6;
  --shadow: 0 28px 80px rgba(9, 16, 30, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at top left, rgba(123, 159, 214, 0.22), transparent 22%),
    radial-gradient(circle at 85% 14%, rgba(255, 205, 168, 0.28), transparent 18%),
    linear-gradient(180deg, #f3f6fb 0%, #e6edf7 48%, #dde6f2 100%);
}

.deck-shell {
  width: 100vw;
  max-width: 100vw;
  margin: 0 auto;
  padding: 28px 0 72px;
}

main {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.slide {
  width: 100vw;
  padding: 0 18px 28px;
}

.slide-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  container-type: size;
  overflow: hidden;
  background: var(--panel);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.slide-art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.slide-art-full {
  object-fit: cover;
  object-position: center;
}

.slide-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}

.overlay-item {
  position: absolute;
}

.overlay-shape,
.overlay-line {
  pointer-events: none;
}

.overlay-text {
  white-space: pre-wrap;
  overflow-wrap: break-word;
  line-height: 1.18;
  letter-spacing: 0;
}

.reveal {
  opacity: 1;
  transform: none;
}

@media (max-width: 760px) {
  .deck-shell {
    width: 100%;
    padding: 12px 0 36px;
  }

  .slide {
    padding: 0 10px 18px;
  }
}