:root {
  --bg: #050505;
  --bg-soft: #101010;
  --panel: rgba(18, 18, 18, 0.88);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f4efe5;
  --muted: rgba(244, 239, 229, 0.72);
  --accent: #b11f2a;
  --accent-soft: rgba(177, 31, 42, 0.45);
  --shadow: rgba(0, 0, 0, 0.6);
}

* {
  box-sizing: border-box;
}

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

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at top, rgba(177, 31, 42, 0.18), transparent 38%),
    radial-gradient(circle at bottom, rgba(104, 12, 19, 0.2), transparent 30%),
    linear-gradient(180deg, #0d0d0d 0%, #020202 100%);
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  overflow: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.035) 50%, transparent 100%),
    repeating-linear-gradient(
      135deg,
      rgba(255, 255, 255, 0.015) 0,
      rgba(255, 255, 255, 0.015) 2px,
      transparent 2px,
      transparent 14px
    );
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.4;
}

.page-shell {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 24px 28px 18px;
}

.site-header {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
}

.site-mark {
  color: var(--text);
  text-decoration: none;
  font-family: "Old English Text MT", "UnifrakturCook", Georgia, serif;
  font-size: clamp(2rem, 4vw, 3.6rem);
  letter-spacing: 0.05em;
  text-shadow: 0 0 22px rgba(177, 31, 42, 0.28);
}

.site-subtitle,
.page-status {
  margin: 0;
  color: var(--muted);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

.page-status {
  padding-top: 14px;
}

.reader {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(64px, 84px) minmax(0, 1fr) minmax(64px, 84px);
  align-items: center;
  gap: 18px;
}

.book-stage {
  position: relative;
  min-height: 0;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px 0 16px;
}

.book-glow {
  position: absolute;
  width: min(84vw, 1120px);
  height: min(72vh, 860px);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(177, 31, 42, 0.18) 0%, rgba(177, 31, 42, 0.08) 36%, transparent 72%);
  filter: blur(18px);
  pointer-events: none;
}

.tap-zone {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 18%;
  z-index: 2;
  border: 0;
  background: transparent;
  opacity: 0;
  touch-action: manipulation;
}

.tap-zone-left {
  left: 0;
}

.tap-zone-right {
  right: 0;
}

.fullscreen-toggle {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 4;
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  background: rgba(10, 10, 10, 0.78);
  color: var(--text);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.42);
  backdrop-filter: blur(8px);
  cursor: pointer;
}

.fullscreen-toggle span {
  font-size: 1.45rem;
  line-height: 1;
}

.fullscreen-toggle-close {
  display: none;
  font-size: 1.7rem;
}

.page-shell.is-fullscreen .fullscreen-toggle-open {
  display: none;
}

.page-shell.is-fullscreen .fullscreen-toggle-close {
  display: block;
}

.spread {
  --pan-x: 0px;
  --pan-y: 0px;
  position: relative;
  z-index: 1;
  width: min(90vw, 1180px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 24px);
  align-items: center;
  translate: var(--pan-x) var(--pan-y);
}

.page-slot {
  min-height: min(72vh, 820px);
  display: flex;
  align-items: center;
}

.page-slot.left {
  justify-content: flex-end;
}

.page-slot.right {
  justify-content: flex-start;
}

.page-slot.empty {
  opacity: 0;
  pointer-events: none;
}

.comic-page {
  --pan-x: 0px;
  --pan-y: 0px;
  display: block;
  width: min(100%, 540px);
  max-height: 74vh;
  object-fit: contain;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    0 30px 70px var(--shadow),
    0 0 0 1px rgba(255, 255, 255, 0.03),
    0 0 28px rgba(177, 31, 42, 0.2);
  background: var(--panel);
  translate: var(--pan-x) var(--pan-y);
}

.page-slot.left .comic-page {
  transform-origin: right center;
}

.page-slot.right .comic-page {
  transform-origin: left center;
}

.page-slot[data-enter="true"] .comic-page {
  animation: page-enter 320ms ease both;
}

.page-slot[data-enter-direction="up"] .comic-page {
  animation: page-enter-up 340ms ease both;
}

.page-slot[data-enter-direction="down"] .comic-page {
  animation: page-enter-down 340ms ease both;
}

.nav-button {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  width: clamp(56px, 7vw, 80px);
  height: clamp(56px, 7vw, 80px);
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(14, 14, 14, 0.76);
  color: var(--text);
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, opacity 180ms ease;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
}

.nav-button:hover {
  transform: translateY(-2px) scale(1.03);
  border-color: rgba(255, 255, 255, 0.24);
  background: rgba(26, 26, 26, 0.92);
}

.nav-button:active {
  transform: scale(0.98);
}

.nav-button:disabled {
  opacity: 0.3;
  cursor: default;
}

.nav-button svg {
  width: 62%;
  height: 62%;
  fill: currentColor;
  filter: drop-shadow(0 0 12px rgba(177, 31, 42, 0.26));
}

.reader-hint {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
  gap: 22px;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding-top: 10px;
}

.page-shell.is-fullscreen {
  padding: 0;
}

.page-shell.is-fullscreen .site-header,
.page-shell.is-fullscreen .reader-hint {
  display: none;
}

.page-shell.is-fullscreen .reader {
  min-height: 100vh;
  grid-template-columns: minmax(54px, 84px) minmax(0, 1fr) minmax(54px, 84px);
  padding: 0 14px;
  align-items: stretch;
}

.page-shell.is-fullscreen .book-stage {
  padding: 0;
  align-items: flex-start;
}

.page-shell.is-fullscreen .book-glow {
  width: min(96vw, 1400px);
  height: min(96vh, 1080px);
}

.page-shell.is-fullscreen .spread {
  width: 100%;
  min-height: 100vh;
  align-items: start;
  align-content: start;
  gap: 0;
}

.page-shell.is-fullscreen .page-slot {
  min-height: 100vh;
  align-items: flex-start;
}

.page-shell.is-fullscreen .comic-page {
  width: auto;
  max-width: none;
  max-height: none;
  height: 100vh;
  object-fit: contain;
  transform-origin: top left;
}

@keyframes page-enter {
  from {
    opacity: 0;
    transform: scale(0.985) translateY(12px);
  }

  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes page-enter-up {
  from {
    opacity: 0;
    transform: translateY(70px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes page-enter-down {
  from {
    opacity: 0;
    transform: translateY(-70px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  body {
    overflow: auto;
  }

  .page-shell {
    padding: 20px 16px 14px;
  }

  .site-header {
    flex-direction: column;
    gap: 8px;
  }

  .reader {
    grid-template-columns: 56px minmax(0, 1fr) 56px;
    gap: 10px;
  }

  .spread {
    width: 100%;
    gap: 10px;
  }

  .page-slot {
    min-height: auto;
  }

  .comic-page {
    max-height: none;
    width: 100%;
  }

  .reader-hint {
    gap: 14px;
    flex-wrap: wrap;
    text-align: center;
  }

  .page-shell.is-fullscreen .comic-page {
    width: auto;
    height: 100vh;
    max-width: none;
    max-height: none;
    touch-action: pan-x pan-y;
  }

  .page-shell.is-fullscreen .nav-button {
    display: none;
  }
}

@media (max-width: 900px) and (orientation: portrait) {
  .book-stage {
    padding-top: 64px;
  }

  .fullscreen-toggle {
    display: inline-flex;
  }

  .page-shell.is-fullscreen .fullscreen-toggle {
    position: fixed;
    top: 14px;
    right: 14px;
  }

  .page-shell.is-fullscreen .reader {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .page-shell.is-fullscreen .book-stage {
    min-height: 100vh;
    padding: 0;
    align-items: center;
  }

  .page-shell.is-fullscreen .spread {
    width: 100vw;
    min-height: 100vh;
    align-items: center;
    align-content: center;
    justify-items: center;
  }

  .page-shell.is-fullscreen .page-slot,
  .page-shell.is-fullscreen .page-slot.mobile-single {
    min-height: 100vh;
    width: 100vw;
    justify-content: center;
    align-items: center;
  }

  .page-shell.is-fullscreen .comic-page {
    width: 100%;
    height: auto;
    max-width: 100%;
    max-height: none;
    touch-action: pan-x pan-y;
  }
}

@media (max-width: 900px) and (orientation: landscape) {
  .page-shell.is-fullscreen .spread {
    width: 100vw;
    min-height: 100vh;
    justify-items: start;
  }

  .page-shell.is-fullscreen .page-slot,
  .page-shell.is-fullscreen .page-slot.mobile-single {
    min-height: 100vh;
    justify-content: flex-start;
    align-items: flex-start;
  }

  .page-shell.is-fullscreen .comic-page {
    width: 100vw;
    height: auto;
    max-width: none;
    max-height: none;
  }
}

@media (max-width: 640px) {
  .reader {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .book-stage {
    order: 1;
    padding: 8px 0;
  }

  .tap-zone {
    width: 22%;
  }

  .nav-button {
    position: fixed;
    bottom: 22px;
  }

  .nav-button-left {
    left: 16px;
  }

  .nav-button-right {
    right: 16px;
  }

  .spread {
    grid-template-columns: 1fr;
  }

  .page-slot.left,
  .page-slot.right {
    justify-content: center;
  }

  .page-slot.mobile-single {
    justify-content: center;
  }

  .page-slot.empty {
    display: none;
  }

  .reader-hint {
    padding-bottom: 86px;
  }

  .page-shell.is-fullscreen .reader {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .page-shell.is-fullscreen .book-stage {
    min-height: 100vh;
  }

  .page-shell.is-fullscreen .spread {
    width: 100vw;
    min-height: 100vh;
    justify-items: start;
  }

  .page-shell.is-fullscreen .page-slot,
  .page-shell.is-fullscreen .page-slot.mobile-single {
    min-height: 100vh;
    justify-content: flex-start;
    align-items: flex-start;
  }

  .page-shell.is-fullscreen .comic-page {
    width: auto;
    height: 100vh;
    max-width: none;
    max-height: none;
    touch-action: pan-x pan-y;
  }
}

@media (max-width: 640px) and (orientation: portrait) {
  .page-shell.is-fullscreen .book-stage {
    align-items: center;
  }

  .page-shell.is-fullscreen .spread {
    justify-items: center;
    align-items: center;
    align-content: center;
  }

  .page-shell.is-fullscreen .page-slot,
  .page-shell.is-fullscreen .page-slot.mobile-single {
    justify-content: center;
    align-items: center;
  }

  .page-shell.is-fullscreen .comic-page {
    width: 100%;
    height: auto;
    max-width: 100%;
    max-height: none;
  }
}