:root {
  --bg: #1b1230;
  --bg-2: #2a1b4a;
  --paper: #fbf6ec;
  --ink: #2c2434;
  --ink-soft: #6b6275;
  --accent: #e8b4c8;
  --gold: #e7c873;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: radial-gradient(circle at 50% 30%, var(--bg-2), var(--bg));
  color: var(--paper);
  font-family: 'Nunito', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Cover ---------- */
.cover {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  z-index: 50;
  transition: opacity 0.8s ease;
  padding: env(safe-area-inset-top) 1rem env(safe-area-inset-bottom);
}
.cover.hide { opacity: 0; pointer-events: none; }

.cover-inner { animation: rise 1s ease both; }
.sparkle { font-size: 2rem; color: var(--gold); margin-bottom: 0.5rem; animation: twinkle 2.4s ease-in-out infinite; }
.cover h1 {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 600;
  font-size: clamp(2.6rem, 11vw, 5rem);
  margin: 0;
  line-height: 1.05;
}
.cover p {
  font-style: italic;
  color: var(--accent);
  margin: 0.4rem 0 2rem;
  font-size: clamp(1rem, 4vw, 1.3rem);
}
.start-btn {
  font: inherit;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
  background: var(--gold);
  border: none;
  border-radius: 999px;
  padding: 0.85rem 2.2rem;
  cursor: pointer;
  box-shadow: 0 8px 30px rgba(231, 200, 115, 0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.start-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 38px rgba(231, 200, 115, 0.45); }
.start-btn:active { transform: translateY(0); }

/* ---------- Book / pages ---------- */
.book {
  position: fixed;
  inset: 0;
  perspective: 2000px;
}

.page {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: calc(env(safe-area-inset-top) + 2rem) 1.25rem calc(env(safe-area-inset-bottom) + 3.5rem);
  transform-origin: left center;
  backface-visibility: hidden;
  transition: transform 0.7s cubic-bezier(0.65, 0.02, 0.3, 1), opacity 0.7s ease;
  will-change: transform, opacity;
}

/* Stacking + turn states */
.page.upcoming { transform: translateX(8%) scale(0.98); opacity: 0; }
.page.current  { transform: none; opacity: 1; z-index: 2; }
.page.turned   { transform: rotateY(-160deg) translateX(-4%); opacity: 0; z-index: 1; }

.page-card {
  width: min(680px, 100%);
  max-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

.page-card img {
  width: 100%;
  max-height: 64vh;
  object-fit: cover;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}

.page-title {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 600;
  font-size: clamp(1.8rem, 7vw, 3rem);
  margin: 0;
  text-align: center;
  line-height: 1.1;
}
.page-text {
  margin: 0;
  text-align: center;
  font-size: clamp(1rem, 4.2vw, 1.25rem);
  color: var(--accent);
  white-space: pre-line;
  max-width: 36ch;
}

/* Per-page theme: default text is light (good over dark bg / photos).
   theme=light pages get dark ink for text-only light backgrounds. */
.page[data-theme='light'] .page-title { color: var(--ink); }
.page[data-theme='light'] .page-text  { color: var(--ink-soft); }

/* ---------- Nav + controls ---------- */
.nav {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 30;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.12);
  color: var(--paper);
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(6px);
  transition: background 0.2s ease, opacity 0.3s ease;
}
.nav:hover { background: rgba(255, 255, 255, 0.22); }
.nav:disabled { opacity: 0.25; cursor: default; }
.nav-prev { left: max(0.75rem, env(safe-area-inset-left)); }
.nav-next { right: max(0.75rem, env(safe-area-inset-right)); }

.mute {
  position: fixed;
  top: calc(env(safe-area-inset-top) + 0.9rem);
  right: calc(env(safe-area-inset-right) + 0.9rem);
  z-index: 30;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.12);
  color: var(--paper);
  font-size: 1.15rem;
  cursor: pointer;
  backdrop-filter: blur(6px);
}
.mute.muted { opacity: 0.5; }

.progress {
  position: fixed;
  bottom: calc(env(safe-area-inset-bottom) + 1rem);
  left: 50%;
  transform: translateX(-50%);
  z-index: 30;
  display: flex;
  gap: 0.5rem;
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: background 0.3s ease, transform 0.3s ease;
}
.dot.active { background: var(--gold); transform: scale(1.4); }

/* On small screens the side arrows can crowd photos; tapping the
   page edges still works (see app.js), so soften the arrows. */
@media (max-width: 540px) {
  .nav { width: 46px; height: 46px; font-size: 1.6rem; background: rgba(255,255,255,0.08); }
}

@media (prefers-reduced-motion: reduce) {
  .page { transition: opacity 0.3s ease; }
  .page.turned { transform: none; }
}

/* ---------- Animations ---------- */
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes twinkle { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }