/* ============================================================
   Paraguay Desk — Flipbook
   Visor sobrio, navy + oro, sin marca de agua
   ============================================================ */

:root {
  --navy: #0E1E3F;
  --gold: #C9A961;
  --cream: #F4EFE6;
  --white: #FFFFFF;
  --bg-stage: radial-gradient(ellipse at center, #1a1a1a 0%, #0a0a0a 100%);
  --shadow-book: 0 24px 40px rgba(0, 0, 0, 0.45), 0 8px 16px rgba(0, 0, 0, 0.30);
  --transition-ui: 220ms cubic-bezier(0.22, 1, 0.36, 1);
  --transition-zoom: 380ms cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  overflow: hidden;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: #0a0a0a;
  -webkit-font-smoothing: antialiased;
}

/* ========== STAGE ========== */
.stage {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-stage);
  padding: 24px;
  overflow: hidden;
}

.stage:fullscreen,
.stage:-webkit-full-screen {
  background: var(--navy);
  padding: 16px;
}

/* ========== FLIPBOOK WRAPPER ========== */
.flipbook-wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  max-width: 1200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flipbook {
  filter: drop-shadow(0 24px 40px rgba(0, 0, 0, 0.45))
          drop-shadow(0 8px 16px rgba(0, 0, 0, 0.30));
  transition: transform var(--transition-zoom);
  transform-origin: center center;
  will-change: transform;
}

.flipbook.is-zoomed {
  cursor: move;
  filter: drop-shadow(0 16px 32px rgba(0, 0, 0, 0.5));
}

/* Fondo blanco sólido para todas las páginas, evita que se transparenten
   durante la animación de giro. */
.stf__item {
  background: #ffffff;
}

/* ========== LOADER ========== */
.loader {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  color: var(--gold);
  z-index: 10;
  transition: opacity 400ms ease;
  pointer-events: none;
}

.loader.is-hidden {
  opacity: 0;
}

.loader-spine {
  width: 4px;
  height: 60px;
  background: var(--gold);
  position: relative;
  animation: spineLoad 1.4s ease-in-out infinite;
}

.loader-spine::before,
.loader-spine::after {
  content: "";
  position: absolute;
  top: 0;
  width: 30px;
  height: 60px;
  background: rgba(201, 169, 97, 0.15);
  border: 1px solid rgba(201, 169, 97, 0.3);
}

.loader-spine::before { right: 4px; transform-origin: right center; animation: leafLoadL 1.4s ease-in-out infinite; }
.loader-spine::after  { left: 4px;  transform-origin: left center;  animation: leafLoadR 1.4s ease-in-out infinite; }

@keyframes spineLoad { 0%, 100% { opacity: 0.6; } 50% { opacity: 1; } }
@keyframes leafLoadL { 0%, 100% { transform: rotateY(0); } 50% { transform: rotateY(-30deg); } }
@keyframes leafLoadR { 0%, 100% { transform: rotateY(0); } 50% { transform: rotateY(30deg); } }

.loader-text {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 400;
  opacity: 0.85;
}

/* ========== UI BUTTONS ========== */
.ui-btn {
  position: absolute;
  background: rgba(14, 30, 63, 0.55);
  color: var(--white);
  border: 1px solid rgba(201, 169, 97, 0.25);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-ui), background var(--transition-ui), border-color var(--transition-ui), transform 120ms ease;
  z-index: 20;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

.flipbook-wrapper:hover .ui-btn,
.ui-btn:focus-visible {
  opacity: 0.9;
}

.ui-btn:hover {
  background: var(--navy);
  border-color: var(--gold);
  opacity: 1;
}

.ui-btn:active {
  transform: scale(0.94);
}

.ui-btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  opacity: 1;
}

.ui-btn--prev { left: 16px; top: 50%; transform: translateY(-50%); }
.ui-btn--next { right: 16px; top: 50%; transform: translateY(-50%); }
.ui-btn--prev:active { transform: translateY(-50%) scale(0.94); }
.ui-btn--next:active { transform: translateY(-50%) scale(0.94); }

.ui-btn--fs {
  top: 16px;
  right: 16px;
  opacity: 0.7;
}

.ui-btn--zoom-close {
  top: 16px;
  right: 70px;
  opacity: 1;
  background: var(--navy);
  border-color: var(--gold);
}

/* Iconos de fullscreen: alterna según estado */
.ui-btn--fs .icon-fs-exit { display: none; }
.is-fullscreen .ui-btn--fs .icon-fs-enter { display: none; }
.is-fullscreen .ui-btn--fs .icon-fs-exit { display: block; }

/* ========== PAGE INDICATOR ========== */
.page-indicator {
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: rgba(14, 30, 63, 0.65);
  color: var(--white);
  padding: 8px 14px;
  border-radius: 4px;
  font-size: 11px;
  letter-spacing: 0.18em;
  font-weight: 400;
  border: 1px solid rgba(201, 169, 97, 0.2);
  z-index: 20;
  pointer-events: none;
  opacity: 0.85;
}

.page-indicator-text { color: var(--gold); }
#currentPage { color: var(--white); font-weight: 600; }

/* ========== HINT ========== */
.hint {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.55);
  font-size: 11px;
  letter-spacing: 0.06em;
  z-index: 20;
  pointer-events: none;
  white-space: nowrap;
  transition: opacity 600ms ease;
}

.hint.is-faded { opacity: 0; }

/* ========== ZOOMED STATE ========== */
body.is-zoomed .ui-btn--prev,
body.is-zoomed .ui-btn--next,
body.is-zoomed .page-indicator,
body.is-zoomed .hint {
  opacity: 0 !important;
  pointer-events: none;
}

body.is-zoomed .stage {
  cursor: move;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 767px) {
  .stage { padding: 8px; }
  .ui-btn--prev, .ui-btn--next { display: none; }
  .hint { font-size: 10px; bottom: 8px; }
  .page-indicator { font-size: 10px; padding: 6px 10px; bottom: 8px; right: 8px; }
}

@media (max-width: 479px) {
  .ui-btn--fs { width: 38px; height: 38px; top: 8px; right: 8px; }
}

/* ========== ACCESIBILIDAD ========== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .flipbook { filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.4)); }
}

/* Foco visible para navegación por teclado */
.flipbook:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}