:root {
  color-scheme: dark;
  --background: #20201f;
  --control-background: rgba(20, 20, 20, 0.76);
  --control-border: rgba(255, 255, 255, 0.18);
  --control-text: rgba(255, 255, 255, 0.94);
  --accent: #d2a37c;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
  background: var(--background);
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

button {
  color: inherit;
  font: inherit;
}

.viewer {
  position: relative;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(circle at 50% 47%, rgba(255, 255, 255, 0.075), transparent 34%),
    radial-gradient(circle at 17% 112%, rgba(196, 143, 102, 0.2), transparent 38%),
    linear-gradient(135deg, #2b2a29 0%, #1c1c1b 52%, #252321 100%);
}

.viewer::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  opacity: 0.25;
  pointer-events: none;
  background:
    linear-gradient(118deg, transparent 16%, rgba(255, 255, 255, 0.04) 48%, transparent 72%),
    radial-gradient(circle at 85% -10%, rgba(255, 255, 255, 0.09), transparent 36%);
}

.book-stage {
  position: absolute;
  inset: 10px 62px 66px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
  touch-action: none;
}

.book-frame {
  display: flex;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
  transform: scale(1);
  transform-origin: center center;
  transition: transform 280ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.viewer.is-zoomed .book-frame {
  transform: scale(1.18);
}

.flip-book {
  width: min(100%, calc((100dvh - 76px) * 1.42742));
  height: min(100%, calc((100vw - 124px) / 1.42742));
  margin: 0 auto;
  aspect-ratio: 1.42742;
  filter: drop-shadow(0 20px 26px rgba(0, 0, 0, 0.36));
  transition: transform 420ms cubic-bezier(0.2, 0.75, 0.18, 1);
}

.viewer.is-cover .flip-book {
  clip-path: inset(0 0 0 50%);
  transform: translateX(-25%);
}

.flip-book canvas {
  image-rendering: auto;
}

.stf__parent {
  margin: auto !important;
}

.stf__wrapper {
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.12);
}

.loading {
  position: fixed;
  top: 50%;
  left: 50%;
  z-index: 8;
  padding: 10px 15px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(14, 14, 14, 0.68);
  transform: translate(-50%, -50%);
  transition: opacity 180ms ease;
}

.viewer.is-ready .loading {
  opacity: 0;
  pointer-events: none;
}

.nav-button {
  position: fixed;
  top: 50%;
  z-index: 10;
  display: grid;
  width: 48px;
  height: 60px;
  padding: 0;
  place-items: center;
  color: rgba(255, 255, 255, 0.88);
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(10, 10, 10, 0.48);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transform: translateY(-50%);
  transition: opacity 180ms ease, background 180ms ease;
  -webkit-tap-highlight-color: transparent;
}

.nav-button:hover {
  background: rgba(10, 10, 10, 0.76);
}

.nav-button:disabled {
  opacity: 0.17;
  cursor: default;
}

.nav-button svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.nav-previous {
  left: 0;
  border-left: 0;
  border-radius: 0 7px 7px 0;
}

.nav-next {
  right: 0;
  border-right: 0;
  border-radius: 7px 0 0 7px;
}

.controls {
  position: fixed;
  bottom: max(10px, env(safe-area-inset-bottom));
  left: 50%;
  z-index: 12;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--control-text);
  transform: translateX(-50%);
}

.tool-button,
.page-status {
  display: grid;
  min-width: 42px;
  height: 42px;
  padding: 0 12px;
  place-items: center;
  color: inherit;
  border: 1px solid var(--control-border);
  border-radius: 6px;
  background: var(--control-background);
  box-shadow: 0 7px 24px rgba(0, 0, 0, 0.26);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.tool-button {
  width: 42px;
  padding: 0;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.tool-button:hover {
  background: rgba(30, 30, 30, 0.9);
}

.tool-button:focus-visible,
.nav-button:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.tool-button svg {
  width: 19px;
  height: 19px;
  fill: currentColor;
}

.sound-toggle .sound-off,
.fullscreen-exit {
  display: none;
}

.sound-toggle[aria-pressed="false"] .sound-on,
.viewer.is-fullscreen .fullscreen-enter {
  display: none;
}

.sound-toggle[aria-pressed="false"] .sound-off,
.viewer.is-fullscreen .fullscreen-exit {
  display: block;
}

.tool-button[aria-pressed="true"] {
  color: #1c1713;
  border-color: rgba(255, 255, 255, 0.36);
  background: var(--accent);
}

.page-status {
  display: flex;
  min-width: 82px;
  gap: 5px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.035em;
}

.page-status .divider {
  opacity: 0.44;
}

.swipe-cue {
  position: fixed;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(19px, calc(env(safe-area-inset-bottom) + 19px));
  z-index: 11;
  width: 64px;
  height: 28px;
  opacity: 0.74;
  transition: opacity 260ms ease;
  pointer-events: none;
}

.swipe-cue::before,
.swipe-cue::after {
  position: absolute;
  top: 8px;
  width: 9px;
  height: 9px;
  content: "";
  border-top: 1.5px solid rgba(255, 255, 255, 0.88);
  border-right: 1.5px solid rgba(255, 255, 255, 0.88);
}

.swipe-cue::before {
  left: 4px;
  transform: rotate(-135deg);
}

.swipe-cue::after {
  right: 4px;
  transform: rotate(45deg);
}

.swipe-cue span {
  position: absolute;
  top: 12px;
  left: 17px;
  width: 30px;
  height: 1px;
  background: rgba(255, 255, 255, 0.74);
  animation: swipe 1.5s ease-in-out infinite;
}

.viewer.has-interacted .swipe-cue {
  opacity: 0;
}

.share-note {
  position: fixed;
  bottom: max(66px, calc(env(safe-area-inset-bottom) + 66px));
  left: 50%;
  z-index: 20;
  padding: 9px 14px;
  color: #fff;
  font-size: 13px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(10, 10, 10, 0.86);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 8px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.share-note.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

@keyframes swipe {
  0%,
  100% {
    opacity: 0.42;
    transform: scaleX(0.5);
  }
  50% {
    opacity: 1;
    transform: scaleX(1);
  }
}

@media (max-width: 700px) {
  .viewer {
    background:
      radial-gradient(circle at 50% 48%, rgba(255, 255, 255, 0.07), transparent 52%),
      #20201f;
  }

  .book-stage {
    inset: max(4px, env(safe-area-inset-top)) 5px max(62px, calc(env(safe-area-inset-bottom) + 62px));
  }

  .viewer.is-zoomed .book-frame {
    transform: scale(1.14);
  }

  .flip-book {
    width: min(100%, calc((100dvh - 66px) * 0.71399));
    height: min(100%, calc((100vw - 10px) / 0.71399));
    aspect-ratio: 0.71399;
  }

  .viewer.is-cover .flip-book {
    clip-path: none;
    transform: none;
  }

  .nav-button {
    width: 37px;
    height: 52px;
    border-color: rgba(255, 255, 255, 0.08);
    background: rgba(10, 10, 10, 0.36);
  }

  .nav-button svg {
    width: 21px;
    height: 21px;
  }

  .controls {
    gap: 4px;
  }

  .tool-button,
  .page-status {
    height: 38px;
    border-radius: 5px;
    background: rgba(15, 15, 15, 0.68);
  }

  .tool-button {
    width: 38px;
    min-width: 38px;
  }

  .tool-button svg {
    width: 18px;
    height: 18px;
  }

  .page-status {
    min-width: 70px;
    padding: 0 8px;
    font-size: 12px;
  }

  .swipe-cue {
    display: none;
  }
}

@media (max-width: 360px) {
  .controls {
    gap: 3px;
  }

  .tool-button,
  .page-status {
    height: 35px;
  }

  .tool-button {
    width: 35px;
    min-width: 35px;
  }

  .page-status {
    min-width: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .book-frame {
    transition-duration: 1ms;
  }

  .swipe-cue span {
    animation: none;
  }
}