.k5fb,
.k5fb * { box-sizing: border-box; }

.k5fb {
  --k5fb-gold: #ddb45e;
  --k5fb-gold-soft: #f4dfac;
  --k5fb-red: #b30d2c;
  --k5fb-red-deep: #41000d;
  position: relative;
  isolation: isolate;
  width: 100%;
  height: var(--k5fb-height, 780px);
  min-height: 520px;
  display: grid;
  grid-template-rows: 62px minmax(0, 1fr) 64px;
  overflow: hidden;
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at 50% 34%, rgba(237, 53, 77, .28), transparent 34%),
    radial-gradient(circle at 14% 85%, rgba(221, 180, 94, .13), transparent 28%),
    linear-gradient(145deg, #260007, #7a071a 48%, #310009);
}

.k5fb:fullscreen { width: 100vw; height: 100vh; }
.k5fb button { font: inherit; }

.k5fb-header {
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding: 0 22px;
  border-bottom: 1px solid rgba(244, 223, 172, .16);
  background: rgba(55, 0, 12, .88);
  backdrop-filter: blur(16px);
}

.k5fb-brand { display: flex; align-items: center; gap: 9px; color: var(--k5fb-gold-soft); }
.k5fb-brand-symbol { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid rgba(221,180,94,.55); border-radius: 50%; color: var(--k5fb-gold); transform: rotate(45deg); }
.k5fb-brand strong, .k5fb-brand small { display: block; letter-spacing: .08em; }
.k5fb-brand strong { font-size: 11px; }
.k5fb-brand small { margin-top: 2px; color: rgba(255,255,255,.55); font-size: 8px; }
.k5fb-title { text-align: center; }
.k5fb-title strong, .k5fb-title span { display: block; }
.k5fb-title strong { color: var(--k5fb-gold-soft); font-family: Georgia, "Times New Roman", serif; font-size: 15px; letter-spacing: .08em; }
.k5fb-title span { margin-top: 3px; color: rgba(255,255,255,.5); font-size: 9px; }
.k5fb-adfree { justify-self: end; display: flex; align-items: center; gap: 7px; color: rgba(255,255,255,.58); font-size: 10px; }
.k5fb-adfree i { width: 7px; height: 7px; border-radius: 50%; background: #58c979; box-shadow: 0 0 12px #58c979; }

.k5fb-stage {
  position: relative;
  min-height: 0;
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) 64px;
  align-items: center;
  overflow: hidden;
  overscroll-behavior: contain;
  touch-action: pan-y;
}

.k5fb-stage::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .12;
  pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle, #000 25%, transparent 75%);
}

.k5fb-book-wrap { position: relative; z-index: 2; grid-column: 2; width: 100%; height: 100%; display: grid; place-items: center; padding: 24px 14px; cursor: grab; touch-action: pan-y; user-select: none; -webkit-user-select: none; }
.k5fb.is-grabbing .k5fb-book-wrap { cursor: grabbing; }
.k5fb-book { --k5fb-zoom: 1; position: relative; transform: scale(var(--k5fb-zoom)); transform-origin: center; transition: transform .18s ease; filter: drop-shadow(0 22px 26px rgba(0,0,0,.52)); }
.k5fb-desktop-book { width: min(100%, calc((var(--k5fb-height, 780px) - 190px) * 2.828)); aspect-ratio: 2.828 / 1; display: grid; grid-template-columns: 1fr 1fr; perspective: 2500px; }
.k5fb-desktop-book::after { content: ""; position: absolute; z-index: 12; top: 0; bottom: 0; left: 50%; width: 18px; transform: translateX(-50%); pointer-events: none; background: linear-gradient(90deg, rgba(0,0,0,.28), transparent 46%, rgba(255,255,255,.1)); mix-blend-mode: multiply; }
.k5fb-mobile-book { width: min(100%, calc((var(--k5fb-height, 780px) - 190px) * 1.414)); aspect-ratio: 1.414 / 1; perspective: 1800px; }
.k5fb-half, .k5fb-page, .k5fb-turning, .k5fb-face { width: 100%; height: 100%; }
.k5fb-half { position: relative; overflow: hidden; background: #fffaf0; }
.k5fb-left { border-radius: 5px 0 0 5px; }
.k5fb-right { border-radius: 0 5px 5px 0; }
.k5fb-page { overflow: hidden; background: #fffaf0; }
.k5fb-page img { display: block; width: 100%; height: 100%; object-fit: cover; user-select: none; -webkit-user-drag: none; }
.k5fb-empty { background: linear-gradient(135deg, rgba(255,250,240,.06), rgba(255,250,240,.015)); }
.k5fb-page-spinner { display: block; position: relative; top: 50%; width: 25px; height: 25px; margin: -13px auto 0; border: 2px solid rgba(90,57,29,.18); border-top-color: #a70818; border-radius: 50%; animation: k5fb-spin .8s linear infinite; }
.k5fb-loading, .k5fb-error { position: absolute; z-index: 25; inset: 50% auto auto 50%; min-width: 230px; padding: 22px 26px; border: 1px solid rgba(244,223,172,.22); border-radius: 14px; color: #fff; background: rgba(70,0,15,.94); box-shadow: 0 18px 46px rgba(0,0,0,.42); text-align: center; transform: translate(-50%,-50%); backdrop-filter: blur(14px); }
.k5fb-loading[hidden], .k5fb-error[hidden] { display: none; }
.k5fb-loading strong, .k5fb-loading small, .k5fb-error strong, .k5fb-error span { display: block; }
.k5fb-loading strong, .k5fb-error strong { color: var(--k5fb-gold-soft); font-family: Georgia, "Times New Roman", serif; }
.k5fb-loading small, .k5fb-error span { margin-top: 7px; color: rgba(255,255,255,.58); font-size: 11px; }
.k5fb-retry { margin-top: 14px; padding: 8px 15px; border: 1px solid rgba(244,223,172,.5); border-radius: 999px; color: var(--k5fb-gold-soft); background: rgba(179,13,44,.55); cursor: pointer; }
.k5fb-retry:hover { border-color: var(--k5fb-gold-soft); background: rgba(179,13,44,.9); }
.k5fb-spinner { display: block; width: 34px; height: 34px; margin: 0 auto 13px; border: 3px solid rgba(221,180,94,.18); border-top-color: var(--k5fb-gold); border-radius: 50%; animation: k5fb-spin .8s linear infinite; }
@keyframes k5fb-spin { to { transform: rotate(360deg); } }

.k5fb-turning { --k5fb-drag-progress: .5; position: absolute; z-index: 10; top: 0; width: 50%; transform-style: preserve-3d; will-change: transform, filter, box-shadow; }
.k5fb-turning::before, .k5fb-turning::after { content: ""; position: absolute; z-index: 24; top: 0; bottom: 0; width: 32px; pointer-events: none; backface-visibility: hidden; }
.k5fb-turning::before { opacity: .84; filter: blur(.2px); }
.k5fb-turning::after { opacity: .72; filter: blur(5px); }
.k5fb-turn-next { left: 50%; transform-origin: left center; animation: k5fb-next .62s cubic-bezier(.45,0,.2,1) forwards; }
.k5fb-turn-next::before { right: -2px; border-radius: 0 75% 75% 0 / 0 48% 52% 0; background: linear-gradient(90deg, rgba(255,255,255,0), rgba(255,248,226,.7) 46%, rgba(69,0,10,.42)); animation: k5fb-fold-next .62s ease-in-out forwards; }
.k5fb-turn-next::after { right: -15px; border-radius: 50%; background: rgba(31,0,6,.48); animation: k5fb-fold-shadow .62s ease-in-out forwards; }
.k5fb-turn-prev { left: 0; transform-origin: right center; animation: k5fb-prev .62s cubic-bezier(.45,0,.2,1) forwards; }
.k5fb-turn-prev::before { left: -2px; border-radius: 75% 0 0 75% / 48% 0 0 52%; background: linear-gradient(90deg, rgba(69,0,10,.42), rgba(255,248,226,.7) 54%, rgba(255,255,255,0)); animation: k5fb-fold-prev .62s ease-in-out forwards; }
.k5fb-turn-prev::after { left: -15px; border-radius: 50%; background: rgba(31,0,6,.48); animation: k5fb-fold-shadow .62s ease-in-out forwards; }
.k5fb-face { position: absolute; inset: 0; overflow: hidden; backface-visibility: hidden; box-shadow: 0 0 20px rgba(0,0,0,.3); }
.k5fb-back { transform: rotateY(180deg); }
@keyframes k5fb-next { 0% { transform: rotateY(0) translateZ(0); filter: brightness(1); box-shadow: 0 0 0 rgba(0,0,0,0); } 48% { filter: brightness(.72); box-shadow: -24px 4px 36px rgba(0,0,0,.4); } 100% { transform: rotateY(-180deg) translateZ(0); filter: brightness(1); box-shadow: 0 0 0 rgba(0,0,0,0); } }
@keyframes k5fb-prev { 0% { transform: rotateY(0) translateZ(0); filter: brightness(1); box-shadow: 0 0 0 rgba(0,0,0,0); } 48% { filter: brightness(.72); box-shadow: 24px 4px 36px rgba(0,0,0,.4); } 100% { transform: rotateY(180deg) translateZ(0); filter: brightness(1); box-shadow: 0 0 0 rgba(0,0,0,0); } }
@keyframes k5fb-fold-next { 0%, 100% { opacity: .12; transform: scaleX(.28); } 48% { opacity: .96; transform: scaleX(1.16); } }
@keyframes k5fb-fold-prev { 0%, 100% { opacity: .12; transform: scaleX(.28); } 48% { opacity: .96; transform: scaleX(1.16); } }
@keyframes k5fb-fold-shadow { 0%, 100% { opacity: 0; transform: scaleX(.3); } 48% { opacity: .76; transform: scaleX(1.24); } }

.k5fb-manual .k5fb-turning, .k5fb-manual .k5fb-mobile-current { animation: none !important; transition: none; }
.k5fb-manual .k5fb-turning::before, .k5fb-manual .k5fb-turning::after { animation: none; opacity: var(--k5fb-fold-opacity, .14); transform: scaleX(var(--k5fb-fold-scale, .3)); }

.k5fb-mobile-target, .k5fb-mobile-current { position: absolute; inset: 0; }
.k5fb-mobile-current { overflow: hidden; transform-style: preserve-3d; backface-visibility: hidden; will-change: transform, opacity, box-shadow; box-shadow: 0 14px 34px rgba(0,0,0,.32); }
.k5fb-mobile-current::after { content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .62; backface-visibility: hidden; }
.k5fb-mobile-turn-next .k5fb-mobile-current { transform-origin: left center; animation: k5fb-mobile-next .62s ease-in forwards; }
.k5fb-mobile-turn-next .k5fb-mobile-current::after { background: linear-gradient(90deg, rgba(67,0,12,.42), transparent 20%, rgba(255,249,228,.5) 88%, rgba(60,0,10,.3)); }
.k5fb-mobile-turn-prev .k5fb-mobile-current { transform-origin: right center; animation: k5fb-mobile-prev .62s ease-in forwards; }
.k5fb-mobile-turn-prev .k5fb-mobile-current::after { background: linear-gradient(90deg, rgba(60,0,10,.3), rgba(255,249,228,.5) 12%, transparent 80%, rgba(67,0,12,.42)); }
.k5fb-manual .k5fb-mobile-current::after { opacity: var(--k5fb-mobile-fold, .18); }
@keyframes k5fb-mobile-next { 0% { transform: rotateY(0); opacity: 1; } 48% { filter: brightness(.74); box-shadow: -26px 5px 38px rgba(0,0,0,.42); } 100% { transform: rotateY(-180deg); opacity: .9; filter: brightness(1); } }
@keyframes k5fb-mobile-prev { 0% { transform: rotateY(0); opacity: 1; } 48% { filter: brightness(.74); box-shadow: 26px 5px 38px rgba(0,0,0,.42); } 100% { transform: rotateY(180deg); opacity: .9; filter: brightness(1); } }

.k5fb-edge {
  z-index: 5;
  display: grid;
  place-items: center;
  width: 42px;
  height: 64px;
  margin: auto;
  padding: 0;
  border: 1px solid rgba(244,223,172,.24);
  border-radius: 999px;
  color: var(--k5fb-gold-soft);
  background: rgba(76,0,16,.72);
  font-size: 34px;
  line-height: 1;
  cursor: pointer;
  transition: .18s ease;
}
.k5fb-edge:hover:not(:disabled) { border-color: rgba(244,223,172,.78); background: rgba(188,13,45,.88); box-shadow: 0 0 24px rgba(197,20,52,.34); transform: scale(1.05); }
.k5fb-edge:disabled { opacity: .16; cursor: default; }

.k5fb-toolbar { z-index: 20; display: flex; align-items: center; justify-content: center; gap: 26px; padding: 9px 14px; border-top: 1px solid rgba(244,223,172,.18); background: rgba(54,0,12,.94); backdrop-filter: blur(16px); }
.k5fb-tool-group { display: flex; align-items: center; gap: 5px; }
.k5fb-tool, .k5fb-counter, .k5fb-zoom-value { height: 40px; border: 1px solid transparent; border-radius: 9px; color: rgba(255,255,255,.76); background: transparent; cursor: pointer; transition: .16s ease; }
.k5fb-tool { display: grid; place-items: center; width: 40px; padding: 0; font-size: 19px; }
.k5fb-tool:hover:not(:disabled), .k5fb-tool.is-active, .k5fb-counter:hover, .k5fb-zoom-value:hover { border-color: rgba(221,180,94,.38); color: var(--k5fb-gold-soft); background: rgba(195,18,51,.32); }
.k5fb-tool:disabled { opacity: .23; cursor: default; }
.k5fb-counter { min-width: 108px; padding: 0 12px; color: var(--k5fb-gold-soft); font-size: 12px; font-variant-numeric: tabular-nums; }
.k5fb-zoom-value { min-width: 54px; font-size: 11px; }
.k5fb button:focus-visible { outline: 2px solid var(--k5fb-gold); outline-offset: 2px; }

.k5fb-drawer { position: absolute; z-index: 60; inset: 0; visibility: hidden; pointer-events: none; }
.k5fb-drawer.is-open { visibility: visible; pointer-events: auto; }
.k5fb-drawer-overlay { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: rgba(0,0,0,.58); opacity: 0; transition: opacity .25s; }
.k5fb-drawer.is-open .k5fb-drawer-overlay { opacity: 1; }
.k5fb-drawer-panel { position: absolute; inset: 0 auto 0 0; width: min(92%, 460px); display: flex; flex-direction: column; color: #fff; background: linear-gradient(180deg, #520012, #250008); box-shadow: 16px 0 42px rgba(0,0,0,.42); transform: translateX(-102%); transition: transform .32s ease; }
.k5fb-drawer.is-open .k5fb-drawer-panel { transform: translateX(0); }
.k5fb-drawer-head { display: flex; align-items: center; justify-content: space-between; padding: 20px; border-bottom: 1px solid rgba(255,255,255,.1); }
.k5fb-drawer-head strong, .k5fb-drawer-head span { display: block; }
.k5fb-drawer-head strong { color: var(--k5fb-gold-soft); font-family: Georgia, "Times New Roman", serif; letter-spacing: .06em; }
.k5fb-drawer-head span { margin-top: 4px; color: rgba(255,255,255,.48); font-size: 11px; }
.k5fb-drawer-close { width: 38px; height: 38px; border: 0; border-radius: 50%; color: #fff; background: rgba(255,255,255,.08); font-size: 24px; cursor: pointer; }
.k5fb-thumb-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 11px; padding: 14px 18px 26px; overflow-y: auto; }
.k5fb-thumb { padding: 5px; border: 1px solid rgba(255,255,255,.1); border-radius: 8px; color: rgba(255,255,255,.62); background: rgba(255,255,255,.035); cursor: pointer; }
.k5fb-thumb:hover, .k5fb-thumb.is-current { border-color: var(--k5fb-gold); color: var(--k5fb-gold-soft); background: rgba(190,15,46,.28); }
.k5fb-thumb-preview { position: relative; display: block; width: 100%; aspect-ratio: 1.414 / 1; overflow: hidden; border-radius: 4px; background: rgba(255,255,255,.08); }
.k5fb-thumb-preview i { position: absolute; inset: 50% auto auto 50%; width: 18px; height: 18px; border: 2px solid rgba(255,255,255,.18); border-top-color: var(--k5fb-gold); border-radius: 50%; transform: translate(-50%,-50%); animation: k5fb-spin .8s linear infinite; }
.k5fb-thumb-preview img { display: block; width: 100%; height: 100%; object-fit: cover; }
.k5fb-thumb span { display: block; padding: 6px 3px 2px; font-size: 10px; text-align: center; }
.k5fb-thumb .k5fb-thumb-preview { padding: 0; }

@media (max-width: 759px) {
  .k5fb { min-height: 430px; grid-template-rows: 52px minmax(0,1fr) 60px; }
  .k5fb-header { grid-template-columns: 1fr auto; padding: 0 12px; }
  .k5fb-brand { display: none; }
  .k5fb-title { text-align: left; }
  .k5fb-title strong { font-size: 11px; }
  .k5fb-adfree { font-size: 8px; }
  .k5fb-stage { grid-template-columns: 40px minmax(0,1fr) 40px; }
  .k5fb-book-wrap { padding: 18px 3px; }
  .k5fb-mobile-book { width: min(100%, calc((var(--k5fb-height, 780px) - 165px) * 1.414)); }
  .k5fb-edge { width: 32px; height: 50px; font-size: 27px; }
  .k5fb-toolbar { justify-content: space-between; gap: 6px; padding: 8px; }
  .k5fb-tool { width: 34px; height: 36px; }
  .k5fb-counter { min-width: 66px; height: 36px; padding: 0 5px; }
  .k5fb-secondary-tools .k5fb-zoom-out, .k5fb-secondary-tools .k5fb-zoom-in, .k5fb-secondary-tools .k5fb-zoom-value { display: none; }
}

@media (max-width: 430px) {
  .k5fb-adfree { display: none; }
  .k5fb-header { grid-template-columns: 1fr; }
  .k5fb-auto { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .k5fb *, .k5fb *::before, .k5fb *::after { animation-duration: 1ms !important; transition-duration: 1ms !important; }
}