:root {
  --verde-900: #082d15;
  --verde-800: #0d3d1e;
  --verde-700: #11532a;
  --verde-600: #1a7038;
  --lima: #8fc73e;
  --lima-claro: #a9dd57;
  --rojo: #d42027;
  --texto: #f2f7f3;
  --texto-tenue: #9fbca9;
  --panel: #0f4423;
  --borde: rgba(255, 255, 255, 0.12);
  --sombra: 0 18px 50px rgba(0, 0, 0, 0.45);
  --radio: 14px;
}

* { box-sizing: border-box; }

/* El atributo hidden debe ganarle a cualquier display de autor (flex/grid/etc). */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overscroll-behavior: none;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--verde-900);
  color: var(--texto);
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; }

/* ============ PORTADA DE ENTRADA ============ */

.intro {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  padding: 24px 20px calc(24px + env(safe-area-inset-bottom));
  background:
    radial-gradient(120% 80% at 50% 0%, #17683a 0%, var(--verde-800) 45%, var(--verde-900) 100%);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.intro.saliendo {
  opacity: 0;
  transform: scale(1.05);
  pointer-events: none;
}

.intro-bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(143, 199, 62, 0.18), transparent 45%),
    radial-gradient(circle at 80% 70%, rgba(143, 199, 62, 0.12), transparent 45%);
  pointer-events: none;
}

.intro-contenido {
  position: relative;
  text-align: center;
  max-width: 420px;
  width: 100%;
  animation: subir 0.7s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

@keyframes subir {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: none; }
}

.intro-marca {
  margin: 0 0 18px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.22em;
  color: #fff;
}

.intro-marca span {
  display: block;
  font-size: 0.62rem;
  letter-spacing: 0.34em;
  color: var(--lima);
  font-weight: 600;
  margin-top: 2px;
}

.intro-portada {
  position: relative;
  display: inline-block;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.6);
  transform: perspective(1200px) rotateY(-8deg) rotateX(2deg);
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
  max-width: 220px;
}

.intro-portada::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, rgba(255,255,255,0.32) 0%, transparent 42%);
  pointer-events: none;
}

.intro-contenido:hover .intro-portada {
  transform: perspective(1200px) rotateY(0deg) rotateX(0deg) translateY(-4px);
}

.intro-portada img {
  display: block;
  width: 100%;
  height: auto;
}

.intro-titulo {
  margin: 22px 0 2px;
  font-size: clamp(2rem, 9vw, 2.7rem);
  line-height: 1;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.intro-evento {
  margin: 0;
  font-size: clamp(0.95rem, 4vw, 1.15rem);
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--lima);
}

.cuenta-regresiva {
  margin: 18px auto 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--borde);
  font-size: 0.85rem;
  color: #fff;
}

.cuenta-regresiva b { color: var(--lima-claro); }

.cuenta-regresiva .punto {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lima);
  box-shadow: 0 0 0 0 rgba(143, 199, 62, 0.7);
  animation: latido 1.8s infinite;
}

@keyframes latido {
  0% { box-shadow: 0 0 0 0 rgba(143, 199, 62, 0.65); }
  70% { box-shadow: 0 0 0 10px rgba(143, 199, 62, 0); }
  100% { box-shadow: 0 0 0 0 rgba(143, 199, 62, 0); }
}

.btn-entrar {
  margin: 24px 0 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 30px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--lima) 0%, #6fae2a 100%);
  color: #06290f;
  font-size: 1.02rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(143, 199, 62, 0.35);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.btn-entrar:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(143, 199, 62, 0.45); }
.btn-entrar:active { transform: translateY(0); }

.btn-flecha { transition: transform 0.18s ease; }
.btn-entrar:hover .btn-flecha { transform: translateX(4px); }

.intro-pie {
  margin: 16px 0 0;
  font-size: 0.78rem;
  color: var(--texto-tenue);
}

/* ============ APP ============ */

.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  background:
    radial-gradient(100% 60% at 50% 0%, var(--verde-700) 0%, var(--verde-800) 50%, var(--verde-900) 100%);
}

/* --- barra superior --- */

.barra-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: calc(8px + env(safe-area-inset-top)) 10px 8px;
  background: rgba(8, 45, 21, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--borde);
  flex-shrink: 0;
  z-index: 10;
}

.barra-top-centro {
  text-align: center;
  min-width: 0;
  flex: 1;
}

.barra-titulo {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 800;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.barra-sub {
  margin: 1px 0 0;
  font-size: 0.7rem;
  color: var(--lima-claro);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.barra-top-acciones { display: flex; gap: 2px; }

.icono-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: var(--texto);
  cursor: pointer;
  transition: background 0.15s ease;
}

.icono-btn:hover, .icono-btn:active { background: rgba(255, 255, 255, 0.12); }

.icono-btn-txt { font-size: 0.82rem; font-weight: 600; }

/* --- escena del libro --- */

.escena {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 10px;
  min-height: 0;
  position: relative;
}

.libro-zona {
  position: relative;
  height: 100%;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.libro {
  margin: 0 auto;
  filter: drop-shadow(0 22px 42px rgba(0, 0, 0, 0.55));
}

.libro .stf__parent { margin: 0 auto; }

.hoja {
  background: #fff;
  overflow: hidden;
}

.hoja img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  -webkit-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
}

.cargando {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--texto-tenue);
  font-size: 0.9rem;
}

.spinner {
  width: 26px;
  height: 26px;
  border: 3px solid rgba(255, 255, 255, 0.18);
  border-top-color: var(--lima);
  border-radius: 50%;
  animation: girar 0.8s linear infinite;
}

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

.flecha {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--borde);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background 0.15s ease, opacity 0.2s ease, transform 0.15s ease;
}

.flecha:hover:not(:disabled) { background: rgba(255, 255, 255, 0.2); transform: scale(1.06); }
.flecha:disabled { opacity: 0; pointer-events: none; }

/* --- barra inferior --- */

.barra-bottom {
  flex-shrink: 0;
  padding: 0 0 calc(6px + env(safe-area-inset-bottom));
  background: rgba(8, 45, 21, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--borde);
}

.progreso {
  height: 3px;
  background: rgba(255, 255, 255, 0.1);
}

.progreso-barra {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--lima) 0%, var(--lima-claro) 100%);
  transition: width 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.barra-bottom-fila {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 14px;
}

.contador {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--texto);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.pill-btn {
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--borde);
  background: rgba(255, 255, 255, 0.08);
  color: var(--texto);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.2s ease;
}

.pill-btn:hover:not(:disabled) { background: rgba(255, 255, 255, 0.18); }
.pill-btn:disabled { opacity: 0.3; cursor: default; }

.pill-btn-primario {
  background: var(--lima);
  border-color: var(--lima);
  color: #06290f;
}

.pill-btn-primario:hover:not(:disabled) { background: var(--lima-claro); }

/* --- botón WhatsApp --- */

.fab-wsp {
  position: fixed;
  right: 16px;
  /* siempre por encima de .barra-bottom para no bloquear "Siguiente" */
  bottom: calc(96px + env(safe-area-inset-bottom));
  z-index: 30;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px 12px 14px;
  border-radius: 999px;
  background: #25d366;
  color: #04331a;
  text-decoration: none;
  font-weight: 800;
  font-size: 0.9rem;
  box-shadow: 0 10px 26px rgba(37, 211, 102, 0.4);
  transition: transform 0.18s ease;
}

.fab-wsp:hover { transform: translateY(-2px) scale(1.03); }

/* ============ ÍNDICE ============ */

.indice {
  position: fixed;
  inset: 0;
  z-index: 70;
  display: flex;
}

.indice-fondo {
  flex: 1;
  background: rgba(0, 0, 0, 0.6);
  animation: aparecer 0.25s ease both;
}

@keyframes aparecer { from { opacity: 0; } to { opacity: 1; } }

.indice-panel {
  order: -1;
  width: min(420px, 88vw);
  background: var(--panel);
  display: flex;
  flex-direction: column;
  box-shadow: var(--sombra);
  animation: deslizar 0.3s cubic-bezier(0.2, 0.8, 0.2, 1) both;
  padding-top: env(safe-area-inset-top);
}

@keyframes deslizar {
  from { transform: translateX(-100%); }
  to { transform: none; }
}

.indice-cabecera {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 12px 10px 18px;
  border-bottom: 1px solid var(--borde);
}

.indice-cabecera h2 { margin: 0; font-size: 1.1rem; font-weight: 800; }

.buscador-caja {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 14px 16px 10px;
  padding: 11px 14px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--borde);
  color: var(--texto-tenue);
}

.buscador-caja input {
  flex: 1;
  min-width: 0;
  border: none;
  background: none;
  color: var(--texto);
  font-size: 0.92rem;
  outline: none;
}

.buscador-caja input::placeholder { color: var(--texto-tenue); }

.secciones {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding: 4px 16px 12px;
}

.seccion-chip {
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid var(--borde);
  background: rgba(255, 255, 255, 0.07);
  color: var(--texto);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.seccion-chip:hover { background: rgba(143, 199, 62, 0.22); border-color: var(--lima); }

.buscador-info {
  margin: 0;
  padding: 0 18px 8px;
  font-size: 0.8rem;
  color: var(--lima-claro);
  min-height: 1em;
}

.indice-grid {
  flex: 1;
  overflow-y: auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(92px, 1fr));
  align-content: start;
  gap: 12px;
  padding: 6px 16px calc(20px + env(safe-area-inset-bottom));
  -webkit-overflow-scrolling: touch;
}

.indice-item {
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
  text-align: center;
  color: var(--texto-tenue);
}

.indice-item img {
  width: 100%;
  aspect-ratio: 1236 / 1600;
  object-fit: cover;
  border-radius: 8px;
  border: 2px solid transparent;
  background: rgba(0, 0, 0, 0.3);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.indice-item:hover img { transform: translateY(-3px); border-color: rgba(143, 199, 62, 0.6); }
.indice-item.activa img { border-color: var(--lima); }
.indice-item.activa { color: var(--lima-claro); }

.indice-item span {
  display: block;
  margin-top: 5px;
  font-size: 0.68rem;
  font-weight: 600;
  line-height: 1.25;
}

/* ============ ZOOM ============ */

.zoom {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: #05190c;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  touch-action: none;
}

.zoom-lienzo {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
}

.zoom-lienzo img {
  max-width: 100%;
  max-height: 100%;
  transform-origin: center center;
  transition: transform 0.2s ease-out;
  will-change: transform;
  -webkit-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
}

.zoom-cerrar {
  position: absolute;
  top: calc(12px + env(safe-area-inset-top));
  right: 14px;
  z-index: 3;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--borde);
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.zoom-ayuda {
  position: absolute;
  bottom: calc(18px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.55);
  color: var(--texto-tenue);
  font-size: 0.78rem;
  white-space: nowrap;
  transition: opacity 0.4s ease;
}

/* ============ RESPONSIVE ============ */

@media (max-width: 760px) {
  .escena { padding: 8px 4px; gap: 2px; }
  .flecha { display: none; }
  .icono-btn-txt { display: none; }
  .fab-wsp { padding: 11px 15px; font-size: 0.84rem; }
  .intro-portada { max-width: 180px; }
}

@media (min-width: 761px) {
  /* a la izquierda: en escritorio la esquina inferior derecha de la hoja
     es la que se arrastra para pasar página */
  .fab-wsp { right: auto; left: 24px; }
}

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