:root {
  --bg-1: #050504;
  --bg-2: #161311;
  --bg-3: #251f17;
  --panel: rgba(16, 14, 13, 0.94);
  --paper: #f2ede5;
  --ink: #1a1714;
  --gold: #dab670;
  --gold-deep: #b8753a;
  --gold-light: #f0d99e;
  --shadow: rgba(0, 0, 0, 0.52);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  font-family: "Inter", sans-serif;
  background:
    radial-gradient(circle at top, rgba(218, 182, 112, 0.14), transparent 22%),
    radial-gradient(circle at 85% 25%, rgba(255, 255, 255, 0.05), transparent 16%),
    linear-gradient(135deg, var(--bg-1) 0%, var(--bg-2) 42%, var(--bg-3) 100%);
  color: #f5f0eb;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(18px, 3vw, 32px) clamp(12px, 2vw, 24px);
}

.page-shell {
  width: min(1800px, 98vw);
  background: linear-gradient(180deg, rgba(20, 17, 16, 0.96), rgba(10, 9, 8, 0.98));
  border: 1.5px solid rgba(218, 182, 112, 0.32);
  border-radius: clamp(20px, 3vw, 36px);
  box-shadow:
    0 clamp(28px, 4vw, 48px) clamp(80px, 8vw, 120px) rgba(0,0,0,0.62),
    inset 0 1px 0 rgba(255,255,255,0.08),
    inset 0 0 0 1px rgba(218, 182, 112, 0.12);
  overflow: hidden;
  backdrop-filter: blur(20px);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: clamp(18px, 2vw, 28px) clamp(24px, 4vw, 42px);
  border-bottom: 1.2px solid rgba(218, 182, 112, 0.18);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01)),
    linear-gradient(90deg, rgba(218,182,112,0.08), transparent 48%);
}

.brand-block {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
}

.brand-kicker {
  color: var(--gold-light);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  font-size: clamp(0.68rem, 1.2vw, 0.88rem);
  font-weight: 900;
  opacity: 0.98;
}

h1 {
  margin: 0;
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(2.8rem, 5vw, 5.2rem);
  line-height: 0.92;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #f8f2ea;
  text-shadow: 0 clamp(6px, 1.5vw, 12px) clamp(12px, 2vw, 24px) rgba(0,0,0,0.28);
}

.nav-actions {
  display: flex;
  gap: clamp(10px, 1.5vw, 18px);
}

.nav-button {
  appearance: none;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.03);
  color: #f7f2ed;
  border-radius: 999px;
  padding: clamp(9px, 1.2vw, 13px) clamp(20px, 2vw, 32px);
  cursor: pointer;
  transition: all 160ms ease;
  font-weight: 800;
  letter-spacing: 0.02em;
  font-size: clamp(0.85rem, 1vw, 0.95rem);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06);
}

.nav-button:hover {
  transform: translateY(-2px);
  background: rgba(255,255,255,0.08);
  border-color: rgba(218, 182, 112, 0.4);
}

.nav-button.primary {
  background: linear-gradient(135deg, var(--gold-light) 0%, #f5d898 12%, var(--gold) 100%);
  border-color: rgba(218, 182, 112, 0.95);
  color: #1a0f05;
  box-shadow: 0 clamp(12px, 2vw, 20px) clamp(24px, 4vw, 36px) rgba(184, 117, 58, 0.34);
}

.nav-button.primary:hover {
  background: linear-gradient(135deg, #fce4a6 0%, #f8dba0 12%, #dab670 100%);
}

.book-stage {
  padding: clamp(32px, 4vw, 52px) clamp(18px, 3vw, 36px);
  min-height: clamp(720px, 60vh, 920px);
  display: flex;
  justify-content: center;
  align-items: center;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.01), rgba(0,0,0,0.12)),
    radial-gradient(circle at center, rgba(218, 182, 112, 0.06), transparent 45%);
}

.flipbook-shell {
  position: relative;
  width: min(94vw, 1800px);
  padding: clamp(18px, 3vw, 32px) clamp(12px, 2.5vw, 28px);
  border-radius: clamp(20px, 3vw, 32px);
  background: linear-gradient(135deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  border: 1.2px solid rgba(218, 182, 112, 0.24);
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.08),
    0 clamp(28px, 4vw, 48px) clamp(40px, 6vw, 64px) rgba(0,0,0,0.28),
    0 0 0 1px rgba(218, 182, 112, 0.08);
  transform-style: preserve-3d;
  perspective: 2400px;
}

.flipbook-shell::before {
  content: "";
  position: absolute;
  inset: clamp(8px, 1.5vw, 14px);
  border-radius: clamp(16px, 2.5vw, 24px);
  border: 1px solid rgba(255,255,255,0.04);
  pointer-events: none;
}

#flipbook {
  margin: 0 auto;
  width: min(95vw, 900px);
  border-radius: clamp(12px, 2vw, 18px);
  box-shadow:
    0 clamp(24px, 4vw, 40px) clamp(44px, 6vw, 72px) rgba(0,0,0,0.26),
    0 0 0 1px rgba(0,0,0,0.06);
  background: var(--paper);
  overflow: hidden;
}

#flipbook .page {
  background: var(--paper);
  border: 1px solid rgba(10,10,10,0.14);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.03);
}

#flipbook .page canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--paper);
}

.turngl {
  transition: transform 200ms ease;
}

.turngl:hover {
  transform: rotateX(2.5deg) rotateY(-7deg) translateY(-4px);
}

.turngl:active {
  transform: rotateX(1.5deg) rotateY(-4deg);
}

@media (max-width: 1200px) {
  .page-shell {
    width: min(1600px, 97vw);
  }

  .flipbook-shell {
    width: min(91vw, 1500px);
  }
}

@media (max-width: 900px) {
  .page-shell {
    width: min(1200px, 96vw);
  }

  .flipbook-shell {
    width: min(92vw, 1100px);
  }
}

@media (max-width: 700px) {
  body {
    padding: 14px 8px;
  }

  .page-shell {
    width: calc(100vw - 16px);
    border-radius: 18px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 16px 12px;
  }

  .brand-block {
    gap: 10px;
  }

  .nav-actions {
    width: 100%;
    justify-content: space-between;
  }

  .nav-button {
    flex: 1;
  }

  .book-stage {
    padding: 16px 6px 24px;
    min-height: 680px;
  }

  .flipbook-shell {
    width: calc(100vw - 20px);
    padding: 8px 6px 6px;
  }

  .flipbook-shell::before {
    display: none;
  }
}