:root {
  color-scheme: dark;
  --ink: #071326;
  --ink-soft: #0d1f3d;
  --panel: rgba(14, 31, 59, 0.78);
  --panel-solid: #102442;
  --paper: #f4f6f2;
  --white: #f8fafc;
  --muted: #9caec5;
  --line: rgba(255, 255, 255, 0.11);
  --lime: #c8f135;
  --lime-strong: #b9ea11;
  --cyan: #39d5e8;
  --danger: #ff8585;
  --shadow: 0 26px 90px rgba(0, 0, 0, 0.44);
  --ease: cubic-bezier(0.2, 0.75, 0.25, 1);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  min-height: 100%;
  background: var(--ink);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--white);
  background:
    radial-gradient(circle at 12% -8%, rgba(57, 213, 232, 0.13), transparent 35%),
    radial-gradient(circle at 88% 12%, rgba(200, 241, 53, 0.11), transparent 30%),
    linear-gradient(145deg, #061023 0%, #08162c 46%, #071326 100%);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

button,
input,
a {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

button {
  color: inherit;
}

svg {
  width: 1.2rem;
  height: 1.2rem;
  fill: currentColor;
}

.app-shell {
  position: relative;
  min-height: 100vh;
  isolation: isolate;
}

.app-shell::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black 0%, transparent 72%);
  content: "";
}

.topbar {
  position: relative;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  padding: 13px clamp(18px, 4vw, 64px);
  border-bottom: 1px solid var(--line);
  background: rgba(5, 15, 32, 0.7);
  backdrop-filter: blur(24px);
}

.brand {
  display: inline-flex;
  gap: 13px;
  align-items: center;
  color: inherit;
  text-decoration: none;
}

.brand-copy {
  display: grid;
  line-height: 1.05;
}

.brand-copy strong {
  font-size: 0.94rem;
  font-weight: 740;
  letter-spacing: -0.01em;
}

.brand-copy span {
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 650;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.topbar-actions,
.zoom-controls {
  display: flex;
  gap: 7px;
  align-items: center;
}

.icon-button,
.contents-button,
.nav-arrow,
.zoom-controls button,
.error-state button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  color: var(--white);
  background: rgba(255, 255, 255, 0.055);
  cursor: pointer;
  transition: border-color 180ms ease, background 180ms ease, color 180ms ease, transform 180ms ease;
}

.icon-button:hover,
.contents-button:hover,
.zoom-controls button:hover {
  border-color: rgba(200, 241, 53, 0.42);
  color: var(--lime);
  background: rgba(200, 241, 53, 0.09);
}

.icon-button {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  text-decoration: none;
}

.icon-button.labelled {
  width: auto;
  gap: 8px;
  padding: 0 15px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 680;
}

.exit-fullscreen {
  display: none;
}

:fullscreen .enter-fullscreen {
  display: none;
}

:fullscreen .exit-fullscreen {
  display: block;
}

.viewer {
  position: relative;
  z-index: 1;
  width: min(1600px, 100%);
  min-height: calc(100vh - 74px);
  margin: 0 auto;
  padding: clamp(22px, 3vw, 42px) clamp(14px, 3.5vw, 56px) 24px;
}

.viewer-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  max-width: 1360px;
  margin: 0 auto 17px;
}

.kicker {
  margin: 0 0 6px;
  color: var(--lime);
  font-size: 0.67rem;
  font-weight: 760;
  letter-spacing: 0.19em;
  text-transform: uppercase;
}

.viewer-heading h1 {
  margin: 0;
  font-size: clamp(1.35rem, 2.2vw, 2.2rem);
  font-weight: 570;
  letter-spacing: -0.04em;
}

.contents-button {
  gap: 9px;
  min-height: 41px;
  padding: 0 15px;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 680;
}

.viewer-stage {
  position: relative;
  display: grid;
  min-height: clamp(310px, calc(100vh - 280px), 700px);
  overflow: hidden;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 28px;
  background:
    linear-gradient(110deg, rgba(255, 255, 255, 0.025), transparent 40%),
    rgba(2, 10, 24, 0.4);
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.035), 0 24px 80px rgba(0, 0, 0, 0.22);
  touch-action: pan-y;
}

.stage-glow {
  position: absolute;
  top: 52%;
  left: 50%;
  width: min(84vw, 1120px);
  height: 42%;
  border-radius: 50%;
  background: rgba(57, 213, 232, 0.12);
  filter: blur(70px);
  opacity: 0.55;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.book-viewport {
  position: absolute;
  inset: 24px 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(200, 241, 53, 0.35) transparent;
}

.book-viewport.turn-in-progress {
  overflow: hidden;
}

.book {
  position: relative;
  display: flex;
  width: min(100%, calc((100vh - 330px) * 2.8378));
  min-width: 0;
  aspect-ratio: 2.8378;
  flex: 0 0 auto;
  align-items: stretch;
  transform: scale(var(--book-zoom, 1));
  transform-origin: center;
  filter: drop-shadow(0 28px 24px rgba(0, 0, 0, 0.34));
  transition: transform 200ms ease;
  cursor: grab;
  perspective: 2400px;
}

.book.is-grabbing { cursor: grabbing; }

.book.single {
  width: min(82%, calc((100vh - 330px) * 1.4189));
  aspect-ratio: 1.4189;
}

.page-shell {
  position: relative;
  z-index: 1;
  width: 50%;
  height: 100%;
  overflow: hidden;
  background: var(--paper);
  backface-visibility: hidden;
  transform-style: preserve-3d;
}

.page-shell.is-blank {
  background: transparent;
  box-shadow: none;
}

.page-shell.is-blank canvas,
.page-shell.is-blank .page-shadow {
  visibility: hidden;
}

.book.single .page-shell {
  width: 100%;
}

.book.single .page-right,
.book.single .page-gutter {
  display: none;
}

.page-left {
  border-radius: 5px 0 0 5px;
  transform-origin: right center;
}

.page-right {
  border-radius: 0 5px 5px 0;
  transform-origin: left center;
}

.book.single .page-left {
  border-radius: 5px;
}

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

.page-shadow {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.page-left .page-shadow {
  background: linear-gradient(to left, rgba(0, 0, 0, 0.17), transparent 4%, transparent 96%, rgba(0, 0, 0, 0.045));
}

.page-right .page-shadow {
  background: linear-gradient(to right, rgba(0, 0, 0, 0.17), transparent 4%, transparent 96%, rgba(0, 0, 0, 0.045));
}

.page-gutter {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  z-index: 4;
  width: 16px;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.22), rgba(255, 255, 255, 0.05), rgba(0, 0, 0, 0.22));
  filter: blur(4px);
  opacity: 0.62;
  transform: translateX(-50%);
  pointer-events: none;
}

.turn-layer {
  --turn-progress: 0;
  --turn-wave: 0;
  position: absolute;
  inset: 0;
  z-index: 8;
  display: none;
  overflow: visible;
  perspective: 2400px;
  perspective-origin: 50% 45%;
  pointer-events: none;
  transform-style: preserve-3d;
}

.turn-layer.is-active { display: block; }

.turning-sheet {
  position: absolute;
  top: 0;
  left: 50%;
  width: 50%;
  height: 100%;
  transform-origin: left center;
  transform-style: preserve-3d;
  will-change: transform;
}

.turn-layer[data-direction="prev"] .turning-sheet {
  left: 0;
  transform-origin: right center;
}

.turn-layer.single-turn .turning-sheet {
  left: 0;
  width: 100%;
}

.turn-layer.single-turn[data-direction="next"] .turning-sheet { transform-origin: left center; }
.turn-layer.single-turn[data-direction="prev"] .turning-sheet { transform-origin: right center; }

.turn-face {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: 0 5px 5px 0;
  background: var(--paper);
  backface-visibility: hidden;
  box-shadow: 0 2px 1px rgba(255, 255, 255, 0.18) inset;
  transform-style: preserve-3d;
}

.turn-layer[data-direction="prev"] .turn-face {
  border-radius: 5px 0 0 5px;
}

.turn-layer.single-turn .turn-face { border-radius: 5px; }

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

.turn-face canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--paper);
}

.turn-face-shade {
  position: absolute;
  inset: 0;
  opacity: var(--face-shade-opacity, 0);
  pointer-events: none;
}

.turn-front .turn-face-shade {
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.04), transparent 38%, rgba(0, 0, 0, 0.55) 100%),
    radial-gradient(ellipse at 8% 50%, transparent 0 50%, rgba(255, 255, 255, 0.16) 78%, transparent 100%);
}

.turn-back .turn-face-shade {
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.42), transparent 28%, rgba(255, 255, 255, 0.12) 100%);
}

.turn-layer[data-direction="prev"] .turn-front .turn-face-shade {
  background:
    linear-gradient(-90deg, rgba(0, 0, 0, 0.04), transparent 38%, rgba(0, 0, 0, 0.55) 100%),
    radial-gradient(ellipse at 92% 50%, transparent 0 50%, rgba(255, 255, 255, 0.16) 78%, transparent 100%);
}

.turn-layer[data-direction="prev"] .turn-back .turn-face-shade {
  background: linear-gradient(-90deg, rgba(0, 0, 0, 0.42), transparent 28%, rgba(255, 255, 255, 0.12) 100%);
}

.turn-edge {
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.08));
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.28);
  opacity: var(--edge-opacity, 0.35);
  transform: translateZ(1px);
}

.turn-layer[data-direction="prev"] .turn-edge {
  right: 0;
  left: auto;
  background: linear-gradient(-90deg, rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.08));
}

.turn-cast-shadow {
  position: absolute;
  top: 1.5%;
  bottom: 1.5%;
  left: 50%;
  width: 44%;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.7);
  filter: blur(18px);
  opacity: var(--cast-shadow-opacity, 0);
  transform: translateX(var(--shadow-shift, 0%)) scaleX(var(--shadow-scale, 0.45));
  transform-origin: left center;
}

.turn-layer[data-direction="prev"] .turn-cast-shadow {
  left: 6%;
  transform: translateX(var(--shadow-shift, 0%)) scaleX(var(--shadow-scale, 0.45));
  transform-origin: right center;
}

.turn-layer.single-turn .turn-cast-shadow {
  left: 5%;
  width: 90%;
}

.nav-arrow {
  position: absolute;
  top: 50%;
  z-index: 8;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(8, 22, 43, 0.82);
  backdrop-filter: blur(16px);
  transform: translateY(-50%);
}

.nav-arrow:hover:not(:disabled) {
  border-color: rgba(200, 241, 53, 0.5);
  color: var(--ink);
  background: var(--lime);
  transform: translateY(-50%) scale(1.06);
}

.nav-arrow:disabled {
  cursor: default;
  opacity: 0.25;
}

.nav-prev { left: 19px; }
.nav-next { right: 19px; }

.loading-state,
.error-state {
  position: absolute;
  z-index: 12;
  display: grid;
  max-width: 360px;
  padding: 28px;
  place-items: center;
  text-align: center;
}

.loading-state strong,
.error-state strong {
  margin-top: 14px;
  font-size: 1rem;
}

.loading-state > span,
.error-state p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.loader-mark {
  position: relative;
  width: 50px;
  height: 50px;
  border: 1px solid rgba(200, 241, 53, 0.3);
  border-radius: 50%;
  animation: spin 1.2s linear infinite;
}

.loader-mark::before {
  position: absolute;
  top: -2px;
  left: 22px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 12px var(--lime);
  content: "";
}

.loader-mark span {
  position: absolute;
  inset: 12px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--cyan), var(--lime));
}

@keyframes spin { to { transform: rotate(360deg); } }

.error-state[hidden],
.loading-state[hidden] {
  display: none;
}

.error-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid rgba(255, 133, 133, 0.42);
  border-radius: 50%;
  color: var(--danger);
  font-weight: 800;
}

.error-state button {
  margin-top: 18px;
  padding: 10px 18px;
  border-color: rgba(200, 241, 53, 0.4);
  border-radius: 999px;
  color: var(--ink);
  background: var(--lime);
  font-size: 0.78rem;
  font-weight: 750;
}

.control-deck {
  display: grid;
  grid-template-columns: minmax(155px, 0.5fr) minmax(180px, 1fr) minmax(155px, 0.5fr);
  gap: 18px;
  align-items: center;
  max-width: 1120px;
  min-height: 60px;
  margin: 11px auto 0;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(12, 30, 56, 0.66);
  backdrop-filter: blur(20px);
}

.page-readout {
  display: flex;
  gap: 10px;
  align-items: center;
  min-width: 0;
  padding-left: 6px;
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
}

#currentPages {
  color: var(--white);
  font-weight: 780;
}

#totalPages {
  overflow: hidden;
  color: var(--muted);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.readout-divider {
  width: 1px;
  height: 16px;
  background: var(--line);
}

.progress-wrap {
  display: flex;
  align-items: center;
}

.page-progress {
  width: 100%;
  height: 4px;
  margin: 0;
  border-radius: 99px;
  appearance: none;
  background: linear-gradient(to right, var(--lime) var(--progress, 0%), rgba(255, 255, 255, 0.12) var(--progress, 0%));
  cursor: pointer;
}

.page-progress::-webkit-slider-thumb {
  width: 15px;
  height: 15px;
  border: 3px solid #17304f;
  border-radius: 50%;
  appearance: none;
  background: var(--lime);
  box-shadow: 0 0 0 1px rgba(200, 241, 53, 0.35), 0 0 16px rgba(200, 241, 53, 0.32);
}

.page-progress::-moz-range-thumb {
  width: 11px;
  height: 11px;
  border: 3px solid #17304f;
  border-radius: 50%;
  background: var(--lime);
}

.zoom-controls {
  justify-content: flex-end;
}

.zoom-controls button {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-size: 1.12rem;
  font-weight: 450;
}

#zoomLabel {
  min-width: 46px;
  color: var(--muted);
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.keyboard-hint {
  margin: 13px 0 0;
  color: rgba(156, 174, 197, 0.62);
  font-size: 0.67rem;
  text-align: center;
}

kbd {
  display: inline-grid;
  min-width: 20px;
  height: 20px;
  margin: 0 2px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  font: inherit;
}

.thumbnail-drawer {
  position: fixed;
  inset: 0;
  z-index: 100;
  visibility: hidden;
  pointer-events: none;
}

.thumbnail-drawer.is-open {
  visibility: visible;
  pointer-events: auto;
}

.drawer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(1, 7, 17, 0.66);
  opacity: 0;
  backdrop-filter: blur(7px);
  transition: opacity 260ms ease;
}

.is-open .drawer-backdrop {
  opacity: 1;
}

.drawer-panel {
  position: absolute;
  inset: 0 auto 0 0;
  display: flex;
  width: min(430px, 91vw);
  flex-direction: column;
  border-right: 1px solid var(--line);
  background: #091932;
  box-shadow: 30px 0 80px rgba(0, 0, 0, 0.36);
  transform: translateX(-102%);
  transition: transform 340ms var(--ease);
}

.is-open .drawer-panel {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
}

.drawer-header > div {
  display: grid;
  gap: 4px;
}

.drawer-header span {
  color: var(--lime);
  font-size: 0.64rem;
  font-weight: 760;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.drawer-header strong {
  font-size: 1.1rem;
  font-weight: 620;
}

.thumbnail-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
  overflow-y: auto;
  padding: 22px;
}

.thumbnail-button {
  display: grid;
  gap: 8px;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  text-align: left;
}

.thumbnail-canvas-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1.4189;
  border: 2px solid transparent;
  border-radius: 7px;
  background: #dfe4df;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.25);
  transition: border-color 180ms ease, transform 180ms ease;
}

.thumbnail-button:hover .thumbnail-canvas-wrap {
  border-color: rgba(200, 241, 53, 0.6);
  transform: translateY(-2px);
}

.thumbnail-button.is-current .thumbnail-canvas-wrap {
  border-color: var(--lime);
  box-shadow: 0 0 0 3px rgba(200, 241, 53, 0.1), 0 12px 28px rgba(0, 0, 0, 0.28);
}

.thumbnail-button canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.thumbnail-button > span {
  padding-left: 2px;
  font-size: 0.68rem;
  font-weight: 690;
}

.thumbnail-button.is-current > span {
  color: var(--lime);
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 130;
  padding: 12px 17px;
  border: 1px solid rgba(200, 241, 53, 0.32);
  border-radius: 999px;
  color: var(--ink);
  background: var(--lime);
  box-shadow: var(--shadow);
  font-size: 0.74rem;
  font-weight: 760;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
  pointer-events: none;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 800px) {
  .topbar { min-height: 66px; padding: 10px 15px; }
  .brand-copy strong { font-size: 0.82rem; }
  .brand-copy span { font-size: 0.56rem; }
  .icon-button.labelled { width: 40px; padding: 0; border-radius: 50%; }
  .icon-button.labelled span { display: none; }
  .viewer { min-height: calc(100vh - 66px); padding: 19px 11px 18px; }
  .viewer-heading { align-items: center; margin: 0 4px 13px; }
  .viewer-heading h1 { font-size: 1.2rem; }
  .contents-button { width: 41px; min-height: 41px; padding: 0; }
  .contents-button span { display: none; }
  .viewer-stage { min-height: clamp(290px, calc(100svh - 260px), 650px); border-radius: 21px; }
  .book-viewport { inset: 22px 46px; }
  .book,
  .book.single { width: min(100%, calc((100svh - 310px) * 1.4189)); aspect-ratio: 1.4189; }
  .book .page-shell { width: 100%; }
  .book .page-right,
  .book .page-gutter { display: none; }
  .book .page-left { border-radius: 5px; }
  .nav-arrow { width: 39px; height: 39px; }
  .nav-arrow svg { width: 1rem; height: 1rem; }
  .nav-prev { left: 6px; }
  .nav-next { right: 6px; }
  .control-deck { grid-template-columns: minmax(110px, 1fr) minmax(110px, 1.2fr); gap: 12px; min-height: 55px; padding: 7px 10px; }
  .progress-wrap { grid-column: 1 / -1; grid-row: 1; padding: 4px 3px 1px; }
  .page-readout { grid-column: 1; grid-row: 2; padding-left: 3px; }
  .zoom-controls { grid-column: 2; grid-row: 2; }
  .keyboard-hint { display: none; }
}

@media (max-width: 430px) {
  .brand-copy strong { max-width: 145px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .brand-copy span { display: none; }
  .viewer-heading .kicker { font-size: 0.56rem; }
  .viewer-heading h1 { max-width: 250px; font-size: 1.04rem; }
  .thumbnail-list { padding: 18px; }
}

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