:root {
  --app-height: 100vh;
  --ink: #f4ead8;
  --button-fill: rgba(16, 17, 20, 0.34);
  --button-stroke: rgba(255, 255, 255, 0.18);
  --button-shadow: rgba(0, 0, 0, 0.35);
  --page-glow: rgba(255, 244, 220, 0.12);
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at center, rgba(255, 222, 171, 0.08), transparent 32%),
    linear-gradient(180deg, #111317 0%, #07080a 100%);
  overflow: hidden;
}

.storybook-shell {
  width: 100vw;
  height: var(--app-height);
}

.storybook-viewer {
  width: 100%;
  height: var(--app-height);
}

.book-frame {
  position: relative;
  width: 100%;
  height: var(--app-height);
  overflow: hidden;
}

.book-shadow {
  position: absolute;
  inset: 4vh 4vw;
  border-radius: 36px;
  background:
    radial-gradient(circle at center, rgba(255, 231, 196, 0.16), transparent 40%),
    rgba(255, 255, 255, 0.02);
  filter: blur(42px);
  z-index: 0;
}

.book {
  position: relative;
  z-index: 1;
  width: 100%;
  height: var(--app-height);
  transform-style: preserve-3d;
  perspective: 2200px;
  background: #050608;
  overflow: hidden;
}

.book::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.58), transparent 10%, transparent 90%, rgba(0, 0, 0, 0.58)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 12%, transparent 88%, rgba(0, 0, 0, 0.18));
  pointer-events: none;
  z-index: 2;
}

.book::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 10px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(255, 247, 230, 0.05), rgba(255, 247, 230, 0.18), rgba(255, 247, 230, 0.05));
  filter: blur(10px);
  z-index: 3;
  opacity: 0.6;
}

.page {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: clamp(0.75rem, 2vw, 1.5rem);
  background: #050608;
  overflow: hidden;
}

.page--base {
  z-index: 1;
}

.page--turn {
  z-index: 4;
  opacity: 0;
  pointer-events: none;
  transform-style: preserve-3d;
  overflow: visible;
  will-change: transform, filter;
}

.page--turn::before,
.page--turn::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: clamp(2.8rem, 9vw, 7rem);
  opacity: 0;
  pointer-events: none;
  z-index: 6;
}

.page--turn::before {
  background: linear-gradient(90deg, rgba(255, 247, 230, 0.55), rgba(255, 247, 230, 0.18) 38%, rgba(255, 247, 230, 0.02) 100%);
  filter: blur(1px);
}

.page--turn::after {
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.18) 42%, transparent 100%);
  filter: blur(10px);
}

.page-face {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: clamp(0.75rem, 2vw, 1.5rem);
  backface-visibility: hidden;
  overflow: hidden;
  background:
    radial-gradient(circle at center, var(--page-glow), transparent 55%),
    #050608;
}

.page-face::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.08), transparent 12%, transparent 88%, rgba(0, 0, 0, 0.14)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), transparent 18%, transparent 82%, rgba(0, 0, 0, 0.1));
  pointer-events: none;
}

.page-face--front {
  transform: rotateY(0deg);
}

.page-face--back {
  transform: rotateY(180deg);
}

.page-image {
  width: auto;
  height: auto;
  max-width: calc(100vw - clamp(1.5rem, 4vw, 3rem));
  max-height: calc(var(--app-height) - clamp(1.5rem, 4vw, 3rem));
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
}

.page-content {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: clamp(1.25rem, 4vw, 3rem);
}

.page-content[hidden] {
  display: none;
}

.finale-card {
  width: min(42rem, 100%);
  padding: clamp(1.5rem, 4vw, 3rem);
  border-radius: 32px;
  background:
    linear-gradient(180deg, rgba(255, 249, 238, 0.96), rgba(244, 229, 203, 0.94)),
    #fff7eb;
  color: #221b14;
  text-align: center;
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.finale-card h2 {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  line-height: 1.05;
}

.finale-card p {
  margin: 1rem 0 0;
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.6;
  color: rgba(34, 27, 20, 0.8);
}

.finale-player-shell {
  margin-top: 1.5rem;
}

.finale-player-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 22px;
  background: #000000;
  box-shadow: 0 16px 38px rgba(0, 0, 0, 0.22);
}

.finale-player-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.finale-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 1.5rem;
  padding: 0.95rem 1.4rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #b44c2d, #8b3119);
  color: #fff8ef;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 14px 30px rgba(139, 49, 25, 0.28);
  transition: transform 180ms ease, box-shadow 180ms ease, filter 180ms ease;
}

.finale-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(139, 49, 25, 0.35);
  filter: brightness(1.02);
}

.finale-link:focus-visible {
  outline: 3px solid rgba(255, 255, 255, 0.45);
  outline-offset: 4px;
}

.finale-url {
  margin-top: 1rem;
  font-size: 0.82rem;
  word-break: break-all;
  color: rgba(34, 27, 20, 0.55);
}

.page-edge {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 18%;
  border: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
  z-index: 6;
}

.page-edge--left {
  left: 0;
}

.page-edge--right {
  right: 0;
}

.page-edge:focus-visible,
.nav-button:focus-visible {
  outline: 3px solid rgba(255, 255, 255, 0.45);
  outline-offset: 3px;
}

.nav-button {
  position: absolute;
  top: 50%;
  width: clamp(3.2rem, 5vw, 4.5rem);
  height: clamp(3.2rem, 5vw, 4.5rem);
  border-radius: 999px;
  border: 1px solid var(--button-stroke);
  background: var(--button-fill);
  color: #ffffff;
  font-size: 1.6rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: 0 16px 40px var(--button-shadow);
  transition: transform 180ms ease, box-shadow 180ms ease, opacity 180ms ease, background-color 180ms ease;
  transform: translateY(-50%);
  z-index: 7;
  backdrop-filter: blur(10px);
}

.nav-button:hover:not(:disabled) {
  transform: translateY(calc(-50% - 2px));
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.45);
  background: rgba(22, 23, 27, 0.46);
}

.nav-button--previous {
  left: clamp(0.9rem, 2vw, 1.6rem);
}

.nav-button--next {
  right: clamp(0.9rem, 2vw, 1.6rem);
}

.nav-button:disabled {
  cursor: not-allowed;
  opacity: 0.28;
  box-shadow: none;
}

.book.is-next .page--turn,
.book.is-prev .page--turn {
  opacity: 1;
}

.book.is-next .page--turn {
  transform-origin: right center;
  animation: flip-next 940ms cubic-bezier(0.22, 0.78, 0.2, 1) forwards;
}

.book.is-prev .page--turn {
  transform-origin: left center;
  animation: flip-prev 940ms cubic-bezier(0.22, 0.78, 0.2, 1) forwards;
}

.book.is-next .page--turn::before {
  right: clamp(0.35rem, 1vw, 1rem);
  animation: curl-highlight-next 940ms cubic-bezier(0.22, 0.78, 0.2, 1) forwards;
}

.book.is-next .page--turn::after {
  right: clamp(-0.5rem, -1vw, -0.2rem);
  animation: curl-shadow-next 940ms cubic-bezier(0.22, 0.78, 0.2, 1) forwards;
}

.book.is-prev .page--turn::before {
  left: clamp(0.35rem, 1vw, 1rem);
  background: linear-gradient(270deg, rgba(255, 247, 230, 0.55), rgba(255, 247, 230, 0.18) 38%, rgba(255, 247, 230, 0.02) 100%);
  animation: curl-highlight-prev 940ms cubic-bezier(0.22, 0.78, 0.2, 1) forwards;
}

.book.is-prev .page--turn::after {
  left: clamp(-0.5rem, -1vw, -0.2rem);
  background: linear-gradient(270deg, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.18) 42%, transparent 100%);
  animation: curl-shadow-prev 940ms cubic-bezier(0.22, 0.78, 0.2, 1) forwards;
}

@keyframes flip-next {
  0% {
    transform: perspective(2200px) translateX(0%) rotateY(0deg) rotateZ(0deg) scaleX(1);
    filter: drop-shadow(10px 0 18px rgba(0, 0, 0, 0.32));
  }

  22% {
    transform: perspective(2200px) translateX(-1%) rotateY(-18deg) rotateZ(-1deg) scaleX(0.99);
    filter: drop-shadow(16px 0 24px rgba(0, 0, 0, 0.38));
  }

  54% {
    transform: perspective(2200px) translateX(-4%) rotateY(-88deg) rotateZ(-2.6deg) scaleX(0.95);
    filter: drop-shadow(34px 0 46px rgba(0, 0, 0, 0.54));
  }

  78% {
    transform: perspective(2200px) translateX(-2.5%) rotateY(-148deg) rotateZ(-1.6deg) scaleX(0.98);
    filter: drop-shadow(18px 0 26px rgba(0, 0, 0, 0.34));
  }

  100% {
    transform: perspective(2200px) translateX(0%) rotateY(-180deg) rotateZ(0deg) scaleX(1);
    filter: drop-shadow(0 0 0 rgba(0, 0, 0, 0));
  }
}

@keyframes flip-prev {
  0% {
    transform: perspective(2200px) translateX(0%) rotateY(0deg) rotateZ(0deg) scaleX(1);
    filter: drop-shadow(-10px 0 18px rgba(0, 0, 0, 0.32));
  }

  22% {
    transform: perspective(2200px) translateX(1%) rotateY(18deg) rotateZ(1deg) scaleX(0.99);
    filter: drop-shadow(-16px 0 24px rgba(0, 0, 0, 0.38));
  }

  54% {
    transform: perspective(2200px) translateX(4%) rotateY(88deg) rotateZ(2.6deg) scaleX(0.95);
    filter: drop-shadow(-34px 0 46px rgba(0, 0, 0, 0.54));
  }

  78% {
    transform: perspective(2200px) translateX(2.5%) rotateY(148deg) rotateZ(1.6deg) scaleX(0.98);
    filter: drop-shadow(-18px 0 26px rgba(0, 0, 0, 0.34));
  }

  100% {
    transform: perspective(2200px) translateX(0%) rotateY(180deg) rotateZ(0deg) scaleX(1);
    filter: drop-shadow(0 0 0 rgba(0, 0, 0, 0));
  }
}

@keyframes curl-highlight-next {
  0% {
    opacity: 0;
    transform: translateX(0) scaleX(1);
  }

  26% {
    opacity: 0.48;
    transform: translateX(-0.15rem) scaleX(1.02);
  }

  54% {
    opacity: 0.82;
    transform: translateX(-0.5rem) scaleX(0.88);
  }

  100% {
    opacity: 0;
    transform: translateX(-0.15rem) scaleX(1);
  }
}

@keyframes curl-highlight-prev {
  0% {
    opacity: 0;
    transform: translateX(0) scaleX(1);
  }

  26% {
    opacity: 0.48;
    transform: translateX(0.15rem) scaleX(1.02);
  }

  54% {
    opacity: 0.82;
    transform: translateX(0.5rem) scaleX(0.88);
  }

  100% {
    opacity: 0;
    transform: translateX(0.15rem) scaleX(1);
  }
}

@keyframes curl-shadow-next {
  0% {
    opacity: 0;
    transform: translateX(0) scaleX(1);
  }

  26% {
    opacity: 0.34;
    transform: translateX(-0.3rem) scaleX(1.06);
  }

  56% {
    opacity: 0.66;
    transform: translateX(-0.8rem) scaleX(0.82);
  }

  100% {
    opacity: 0;
    transform: translateX(-0.3rem) scaleX(1);
  }
}

@keyframes curl-shadow-prev {
  0% {
    opacity: 0;
    transform: translateX(0) scaleX(1);
  }

  26% {
    opacity: 0.34;
    transform: translateX(0.3rem) scaleX(1.06);
  }

  56% {
    opacity: 0.66;
    transform: translateX(0.8rem) scaleX(0.82);
  }

  100% {
    opacity: 0;
    transform: translateX(0.3rem) scaleX(1);
  }
}

@media (max-width: 720px) {
  .nav-button--previous {
    left: 0.75rem;
  }

  .nav-button--next {
    right: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}