@font-face {
  font-family: 'Bookman Demi';
  src: url('../assets/fonts/URWBookman-Demi.otf') format('opentype');
  font-display: block;
}
@font-face {
  font-family: 'P052';
  src: url('../assets/fonts/P052-Italic.otf') format('opentype');
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: 'P052';
  src: url('../assets/fonts/P052-Roman.otf') format('opentype');
  font-display: swap;
}

:root {
  --pw: 600px;
  --ph: 800px;
  --bx: 0px;
  --by: 0px;
  --T: 26px;
  --ov: 14px;
  --gold-hi: #f6e2a4;
  --gold: #d2a64a;
  --gold-lo: #8a6420;
  --ink: #2a1c10;
  --paper: #efe4cb;
  --noise: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .35  0 0 0 0 .25  0 0 0 0 .12  0 0 0 .14 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  --wear: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='w'><feTurbulence type='fractalNoise' baseFrequency='.7' numOctaves='2' seed='4'/><feColorMatrix values='0 0 0 0 .2  0 0 0 0 .13  0 0 0 0 .04  0 0 -1.6 0 1.05'/></filter><rect width='100%' height='100%' filter='url(%23w)'/></svg>");
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #120c07;
  color: var(--gold-hi);
  font-family: 'P052', 'Palatino Linotype', Palatino, Georgia, serif;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
}

button { font: inherit; color: inherit; cursor: pointer; }
button:focus-visible { outline: 2px solid var(--gold-hi); outline-offset: 3px; }

#stage {
  position: fixed;
  inset: 0;
  overflow: hidden;
  touch-action: pan-y pinch-zoom;
}

/* ---------- Стол ---------- */

.table {
  position: absolute;
  inset: -2%;
  background:
    radial-gradient(ellipse 70% 65% at 45% 42%, transparent 35%, rgba(8, 4, 1, .75) 100%),
    url('../assets/cover/table.webp') center / cover no-repeat;
  transition: transform 2.6s cubic-bezier(.45, 0, .2, 1), filter 2.6s ease;
}
.dim {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(10, 6, 2, .35), rgba(6, 3, 1, .85));
  opacity: 0;
  transition: opacity 2s ease;
  pointer-events: none;
}
body:not(.is-closed) .table { transform: scale(1.12); filter: blur(2px); }
body:not(.is-closed) .dim { opacity: 1; }

/* ---------- Камера и книга ---------- */

#camera {
  position: absolute;
  inset: 0;
  transform-origin: 0 0;
  perspective: 2800px;
  will-change: transform;
}
#camera.is-moving { transition: transform var(--cam-dur, 1.1s) cubic-bezier(.55, 0, .25, 1); }

#book {
  position: absolute;
  left: var(--bx);
  top: var(--by);
  width: var(--pw);
  height: var(--ph);
  transform-style: preserve-3d;
  transform-origin: 50% 50%;
}
#book > * { position: absolute; transform-style: preserve-3d; }

.book-shadow {
  left: 0;
  top: calc(-1 * var(--ov));
  width: calc(var(--pw) + var(--ov));
  height: calc(var(--ph) + 2 * var(--ov));
  border-radius: 4px 10px 10px 4px;
  transform: translateZ(calc(-1 * var(--T) - 3px));
  box-shadow:
    0 calc(var(--ph) * .02) calc(var(--ph) * .03) rgba(0, 0, 0, .55),
    0 calc(var(--ph) * .05) calc(var(--ph) * .12) rgba(0, 0, 0, .55);
}

.leather {
  background: url('../assets/cover/leather.webp') center / 100% 100% no-repeat, #1e3324;
}

.board-back {
  left: 0;
  top: calc(-1 * var(--ov));
  width: calc(var(--pw) + var(--ov));
  height: calc(var(--ph) + 2 * var(--ov));
  border-radius: 3px 8px 8px 3px;
  background: linear-gradient(rgba(0, 0, 0, .25), rgba(0, 0, 0, .25)), url('../assets/cover/leather.webp') center / 100% 100%;
  transform: translateZ(calc(-1 * var(--T) - 1px));
}

.edge {
  background:
    repeating-linear-gradient(0deg, rgba(120, 95, 60, .28) 0 1px, transparent 1px 3px),
    linear-gradient(#f2e8d2, #d9caa7);
}
.edge-top {
  left: 0;
  top: calc(-1 * var(--T));
  width: calc(var(--pw) - 2px);
  height: var(--T);
  transform-origin: 50% 100%;
  transform: rotateX(90deg);
}
.edge-bottom {
  left: 0;
  top: 100%;
  width: calc(var(--pw) - 2px);
  height: var(--T);
  transform-origin: 50% 0;
  transform: rotateX(-90deg);
}
.edge-right {
  left: calc(100% - 2px);
  top: 0;
  width: var(--T);
  height: var(--ph);
  transform-origin: 0 50%;
  transform: rotateY(90deg);
  background:
    repeating-linear-gradient(90deg, rgba(120, 95, 60, .28) 0 1px, transparent 1px 3px),
    linear-gradient(90deg, #efe4cc, #d6c6a2);
}
.spine {
  left: calc(-1 * var(--T) - 2px);
  top: calc(-1 * var(--ov));
  width: calc(var(--T) + 4px);
  height: calc(var(--ph) + 2 * var(--ov));
  transform-origin: 100% 50%;
  transform: translateX(-2px) rotateY(-90deg);
  background: linear-gradient(90deg, #0d1a11, #23402c 40%, #1a3021 70%, #0d1a11);
}

/* ---------- Страницы ---------- */

.page {
  top: 0;
  width: var(--pw);
  height: var(--ph);
  background-color: var(--paper);
  background-size: 100% 100%;
  background-repeat: no-repeat;
}
.page::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.page-right {
  left: 0;
  border-radius: 0 3px 3px 0;
  transform: translateZ(0);
}
.page-right::after {
  background: linear-gradient(90deg, rgba(40, 25, 10, .32), rgba(40, 25, 10, .08) 2.5%, transparent 7%);
}
.page-left {
  left: calc(-1 * var(--pw));
  border-radius: 3px 0 0 3px;
  background-image: var(--noise);
  background-size: 220px 220px;
  background-repeat: repeat;
  transform: translateZ(1px);
  display: none;
}
.page-left::after {
  background:
    linear-gradient(270deg, rgba(40, 25, 10, .38), rgba(40, 25, 10, .1) 3%, transparent 9%),
    linear-gradient(90deg, rgba(0, 0, 0, .12), transparent 30%);
}
body.has-left .page-left { display: block; }

.turn-shadow {
  top: 0;
  height: var(--ph);
  pointer-events: none;
  opacity: 0;
  display: none;
}
.turn-shadow-right {
  left: 0;
  width: 1px;
  transform-origin: 0 0;
  background: linear-gradient(90deg, rgba(20, 10, 0, .55), rgba(20, 10, 0, .18) 35%, transparent);
  transform: translateZ(.5px);
}
.turn-shadow-left {
  left: 0;
  width: 1px;
  transform-origin: 100% 0;
  background: linear-gradient(270deg, rgba(20, 10, 0, .5), rgba(20, 10, 0, .15) 35%, transparent);
  transform: translateZ(1.5px);
}
body.is-turning .turn-shadow { display: block; }

/* Лист собран из вложенных вертикальных полос: каждая повёрнута относительно
   предыдущей, поэтому лист изгибается, а не поворачивается плоской картонкой. */
.leaf {
  left: 0;
  top: 0;
  width: var(--pw);
  height: var(--ph);
  transform: translateZ(2px);
  display: none;
  pointer-events: none;
}
body.is-turning .leaf { display: block; }
.strip {
  position: absolute;
  top: 0;
  left: 100%;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transform-origin: 0 50%;
}
.leaf > .strip { left: 0; }
.strip > .sf,
.strip > .sb {
  position: absolute;
  top: 0;
  left: 0;
  width: calc(100% + .7px);
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background-repeat: no-repeat;
}
.strip > .sf { background-color: var(--paper); }
.strip > .sb {
  transform: rotateY(180deg);
  background: var(--noise) 0 0 / 220px 220px, var(--paper);
}
.strip > .sf::after,
.strip > .sb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: #1a0f05;
  opacity: var(--shade, 0);
}
.strip > .sf::before,
.strip > .sb::before {
  content: '';
  position: absolute;
  inset: 0;
  background: #fff8e6;
  opacity: var(--light, 0);
  z-index: 1;
}

/* ---------- Обложка ---------- */

.cover {
  left: 0;
  top: calc(-1 * var(--ov));
  width: calc(var(--pw) + var(--ov));
  height: calc(var(--ph) + 2 * var(--ov));
  transform-origin: 0 50%;
  transform: translateZ(var(--cover-z, 3px)) rotateY(var(--cover-angle, 0deg));
}
body:not(.is-closed) .cover { --cover-z: 0px; --cover-angle: -180deg; }
.cover-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.cover-front {
  border-radius: 3px 9px 9px 3px;
  background: url('../assets/cover/leather.webp') center / 100% 100% no-repeat, #1e3324;
  box-shadow:
    inset 6px 0 10px rgba(0, 0, 0, .45),
    inset -2px -3px 6px rgba(0, 0, 0, .35),
    inset 1px 1px 2px rgba(255, 240, 200, .15);
  container-type: size;
}
.cover-front::before {
  content: '';
  position: absolute;
  left: 4.2%;
  top: 0;
  bottom: 0;
  width: 1.4%;
  background: linear-gradient(90deg, rgba(0, 0, 0, .35), rgba(255, 255, 255, .06), rgba(0, 0, 0, .25));
}
.cover-inside {
  transform: rotateY(180deg);
  border-radius: 9px 3px 3px 9px;
  background: linear-gradient(rgba(0, 0, 0, .2), rgba(0, 0, 0, .2)), url('../assets/cover/leather.webp') center / 100% 100%;
  box-shadow: 0 0 calc(var(--ph) * .05) rgba(0, 0, 0, .55);
}
.cover-inside::before {
  content: '';
  position: absolute;
  top: var(--ov);
  bottom: var(--ov);
  left: var(--ov);
  right: 0;
  background: url('../assets/cover/endpaper.webp') center / cover;
  box-shadow: inset -12px 0 18px rgba(40, 25, 10, .35);
}

.cover-title {
  position: absolute;
  left: 8%;
  right: 8%;
  top: 31%;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.emboss {
  position: relative;
  z-index: 0;
  display: block;
  font-family: 'Bookman Demi', 'P052', Georgia, serif;
  font-size: 15.5cqw;
  line-height: 1.08;
  letter-spacing: .01em;
  color: #0b170e;
  text-shadow:
    -1px -1px 1px rgba(0, 0, 0, .75),
    1px 1px 1px rgba(255, 228, 160, .28),
    0 0 .12em rgba(0, 0, 0, .35);
}
.emboss::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  z-index: 1;
  color: transparent;
  background:
    var(--wear) 0 0 / 9cqw 9cqw,
    linear-gradient(172deg, var(--gold-hi) 8%, #e2bd66 30%, var(--gold-lo) 52%, #e6c171 70%, #a57a2d 92%);
  -webkit-background-clip: text;
  background-clip: text;
  text-shadow: none;
}
.emboss-sub {
  margin-top: 2.6cqw;
  font-family: 'P052', Georgia, serif;
  font-style: italic;
  font-size: 5.6cqw;
  letter-spacing: .02em;
}
.cover-rule {
  display: block;
  width: 46%;
  height: .55cqw;
  margin-top: 4cqw;
  background:
    radial-gradient(circle at 50% 50%, var(--gold) 0 .9cqw, transparent 1cqw) center / 3cqw 100% no-repeat,
    linear-gradient(90deg, transparent, var(--gold) 20%, var(--gold-hi) 50%, var(--gold) 80%, transparent);
  box-shadow: 0 1px 1px rgba(0, 0, 0, .6);
  opacity: .85;
}

/* ---------- Интерфейс ---------- */

.intro {
  position: absolute;
  left: 0;
  right: 0;
  bottom: max(6vh, 28px);
  display: flex;
  justify-content: center;
  transition: opacity .6s ease, transform .6s ease;
}
body:not(.is-closed) .intro,
body.is-busy .intro { opacity: 0; transform: translateY(20px); pointer-events: none; }

.btn-read {
  padding: .7em 2.6em .75em;
  border: 1px solid rgba(232, 196, 113, .75);
  border-radius: 999px;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(255, 230, 170, .18), transparent 70%),
    linear-gradient(180deg, #2b4a33, #15281b);
  box-shadow:
    0 0 0 4px rgba(20, 35, 24, .55),
    0 0 0 5px rgba(232, 196, 113, .35),
    0 10px 30px rgba(0, 0, 0, .55),
    inset 0 1px 0 rgba(255, 240, 200, .25);
  color: var(--gold-hi);
  font-family: 'Bookman Demi', Georgia, serif;
  font-size: clamp(18px, 2.4vh, 24px);
  letter-spacing: .12em;
  text-shadow: 0 1px 2px rgba(0, 0, 0, .7);
  transition: transform .25s ease, box-shadow .25s ease, filter .25s ease;
  animation: glow 3.2s ease-in-out infinite;
}
.btn-read:hover { transform: translateY(-2px); filter: brightness(1.12); }
.btn-read:active { transform: translateY(1px); }
@keyframes glow {
  0%, 100% { box-shadow: 0 0 0 4px rgba(20, 35, 24, .55), 0 0 0 5px rgba(232, 196, 113, .35), 0 10px 30px rgba(0, 0, 0, .55), inset 0 1px 0 rgba(255, 240, 200, .25); }
  50% { box-shadow: 0 0 0 4px rgba(20, 35, 24, .55), 0 0 0 5px rgba(232, 196, 113, .55), 0 10px 30px rgba(0, 0, 0, .55), 0 0 28px rgba(246, 210, 120, .35), inset 0 1px 0 rgba(255, 240, 200, .25); }
}

.controls {
  position: absolute;
  left: 50%;
  bottom: max(14px, env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
  gap: 18px;
  transform: translateX(-50%) translateY(16px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .5s ease, transform .5s ease;
}
body.is-reading .controls { opacity: 1; transform: translateX(-50%); pointer-events: auto; }
body.is-reading.is-busy .controls { opacity: .35; pointer-events: none; }
body.is-transition .controls { opacity: 0; }

.nav-btn {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid rgba(232, 196, 113, .55);
  border-radius: 50%;
  background: linear-gradient(180deg, rgba(43, 74, 51, .92), rgba(21, 40, 27, .92));
  box-shadow: 0 6px 18px rgba(0, 0, 0, .5), inset 0 1px 0 rgba(255, 240, 200, .2);
  transition: transform .2s ease, opacity .3s ease, filter .2s ease;
}
.nav-btn svg { width: 22px; height: 22px; fill: none; stroke: var(--gold-hi); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.nav-btn:hover { filter: brightness(1.2); transform: scale(1.06); }
.nav-btn:disabled { opacity: .25; pointer-events: none; }

.counter {
  min-width: 70px;
  text-align: center;
  font-size: 17px;
  letter-spacing: .08em;
  color: rgba(246, 226, 164, .85);
  text-shadow: 0 1px 3px rgba(0, 0, 0, .8);
}

.btn-close {
  display: none;
  padding: .45em 1.3em;
  border: 1px solid rgba(232, 196, 113, .55);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(43, 74, 51, .92), rgba(21, 40, 27, .92));
  font-size: 15px;
  letter-spacing: .05em;
  box-shadow: 0 6px 18px rgba(0, 0, 0, .5);
}
body.is-last .btn-close { display: inline-block; }

body.is-touch .nav-btn { display: none; }
body.is-touch .counter { font-size: 14px; min-width: 0; }
body.is-touch .controls { gap: 12px; }

.swipe-hint {
  position: absolute;
  left: 50%;
  bottom: calc(max(14px, env(safe-area-inset-bottom)) + 34px);
  transform: translateX(-50%);
  padding: .5em 1.1em;
  border-radius: 999px;
  background: rgba(15, 25, 18, .78);
  color: var(--gold-hi);
  font-size: 14px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .6s ease;
}
.swipe-hint span { display: inline-block; animation: nudge 1.4s ease-in-out infinite; }
.swipe-hint span:last-child { animation-direction: reverse; }
body.show-hint .swipe-hint { opacity: 1; }
@keyframes nudge { 50% { transform: translateX(-4px); } }

/* ---------- Видеопереход ---------- */

.video-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
body.is-transition .video-layer { pointer-events: auto; }
.video-backdrop {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: #1a110a;
  opacity: 0;
  transition: opacity var(--fade, .45s) ease;
}
/* Края кадра растянуты на весь экран и размыты: фон продолжает картинку по цвету. */
.video-ambient {
  position: absolute;
  left: -6%;
  top: -6%;
  width: 112%;
  height: 112%;
  filter: blur(56px) saturate(1.1) brightness(.92);
}
.video-backdrop::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 50%, transparent 55%, rgba(10, 6, 2, .35));
}
.video-layer video {
  position: absolute;
  left: 0;
  top: 0;
  object-fit: contain;
  opacity: 0;
  transition: opacity var(--fade, .45s) ease;
  background: transparent;
  -webkit-mask-image:
    linear-gradient(90deg, transparent, #000 4%, #000 96%, transparent),
    linear-gradient(180deg, transparent, #000 6%, #000 94%, transparent);
  -webkit-mask-composite: source-in;
  mask-image:
    linear-gradient(90deg, transparent, #000 4%, #000 96%, transparent),
    linear-gradient(180deg, transparent, #000 6%, #000 94%, transparent);
  mask-composite: intersect;
}
.video-layer.is-playing video,
.video-layer.is-playing .video-backdrop { opacity: 1; }
.btn-skip {
  position: absolute;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  padding: .45em 1.2em;
  border: 1px solid rgba(232, 196, 113, .5);
  border-radius: 999px;
  background: rgba(15, 25, 18, .6);
  font-size: 14px;
  letter-spacing: .05em;
  opacity: 0;
  pointer-events: none;
  transition: opacity .4s ease;
}
body.is-transition .btn-skip { opacity: .85; pointer-events: auto; }

@media (prefers-reduced-motion: reduce) {
  .btn-read { animation: none; }
  .table, .dim { transition-duration: .4s; }
  .swipe-hint span { animation: none; }
}