:root {
  --page-turn-duration: 1050ms;
  --cover-max-width: 42rem;
  --cover-tilt: -1.1deg;
  --cover-shadow: rgba(36, 10, 0, 0.42);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: #f7f5f1;
}

body {
  min-height: 100%;
  margin: 0;
  color: #24180f;
  font-family: Arial, sans-serif;
}

body.is-cover-locked {
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
  touch-action: none;
}

img {
  display: block;
  max-width: 100%;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Contenido temporal detrás de la portada */
.invitation {
  min-height: 125vh;
  background: #fffbe0;
  outline: none;
}

.invitation__placeholder {
  display: grid;
  min-height: 100vh;
  place-content: center;
  padding: 2rem;
  text-align: center;
}

.invitation__placeholder h1,
.invitation__placeholder p {
  margin: 0;
}

.invitation__placeholder h1 {
  color: #fe4200;
  font-size: clamp(4rem, 18vw, 9rem);
  line-height: 0.9;
  text-transform: uppercase;
}

.invitation__eyebrow {
  margin-bottom: 0.75rem !important;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

/* Pantalla de apertura */
.cover-intro {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  overflow: hidden;
  padding: 0.75rem;
  place-items: center;
  background: #f7f5f1;
  isolation: isolate;
  transition: background-color 300ms ease;
}

/* Este elemento inclina la revista completa sin afectar el giro de página. */
.cover-intro__stage {
  display: inline-block;
  line-height: 0;
  filter: drop-shadow(0 0.8rem 1.35rem rgba(45, 27, 17, 0.28));
  perspective: 1600px;
  perspective-origin: left center;
  transform: rotate(var(--cover-tilt));
}

.cover-intro.is-entering {
  pointer-events: none;
}

.cover-intro.is-entering .cover-intro__stage {
  opacity: 0;
}

.cover-intro.is-ready .cover-intro__stage {
  animation: magazine-arrival 2000ms cubic-bezier(0.18, 0.72, 0.25, 1) both;
}

@keyframes magazine-arrival {
  from {
    opacity: 0;
    transform: rotate(calc(var(--cover-tilt) - 450deg)) scale(0.2);
  }

  90% {
    opacity: 1;
  }

  to {
    opacity: 1;
    transform: rotate(var(--cover-tilt)) scale(1);
  }
}

.cover {
  position: relative;
  display: inline-block;
  overflow: hidden;
  backface-visibility: hidden;
  background: #ffb23e;
  border-radius: 0;
  cursor: pointer;
  isolation: isolate;
  line-height: 0;
  outline: none;
  transform: rotateY(0deg);
  transform-origin: left center;
  transform-style: preserve-3d;
  transition:
    transform var(--page-turn-duration) cubic-bezier(0.68, 0.02, 0.32, 1),
    filter var(--page-turn-duration) ease,
    box-shadow var(--page-turn-duration) ease,
    border-radius var(--page-turn-duration) cubic-bezier(0.68, 0.02, 0.32, 1),
    opacity 240ms ease calc(var(--page-turn-duration) - 240ms);
  will-change: transform, opacity, filter;
}

.cover__image {
  position: relative;
  z-index: 1;
  width: auto;
  height: auto;
  max-width: min(calc(100vw - 1.5rem), var(--cover-max-width));
  max-height: calc(100vh - 1.5rem);
  max-height: calc(100dvh - 1.5rem);
  object-fit: contain;
  pointer-events: none;
  user-select: none;
}

/* Luz y sombra que simulan la curvatura del papel durante el giro. */
.cover::before,
.cover::after {
  position: absolute;
  z-index: 2;
  content: "";
  pointer-events: none;
  opacity: 0;
  transition: opacity calc(var(--page-turn-duration) * 0.72) ease;
}

.cover::before {
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.03) 0%,
    rgba(255, 255, 255, 0.2) 34%,
    rgba(61, 19, 5, 0.12) 68%,
    rgba(30, 8, 0, 0.62) 100%
  );
  mix-blend-mode: soft-light;
}

.cover::after {
  top: 0;
  right: 0;
  bottom: 0;
  width: 9%;
  background: linear-gradient(90deg, transparent, rgba(29, 7, 0, 0.72));
  filter: blur(3px);
  mix-blend-mode: multiply;
}

.cover-intro.is-opening,
.cover-intro.is-closing {
  pointer-events: none;
}

.cover-intro.is-open {
  pointer-events: none;
  background-color: transparent;
}

.cover-intro.is-open .cover {
  border-radius: 0 44% 44% 0 / 0 7% 7% 0;
  box-shadow: 35px 4px 55px var(--cover-shadow);
  filter: brightness(0.72);
  opacity: 0;
  transform: rotateY(-108deg) skewY(-1.4deg) scaleX(0.9);
}

.cover-intro.is-open .cover::before,
.cover-intro.is-open .cover::after {
  opacity: 0.88;
}

/* Control de música: aparece cinco segundos después de abrir la portada. */
.music-toggle {
  position: fixed;
  z-index: 2000;
  right: calc(1rem + env(safe-area-inset-right));
  bottom: calc(1rem + env(safe-area-inset-bottom));
  display: grid;
  width: 2.35rem;
  aspect-ratio: 1;
  padding: 0;
  place-items: center;
  border: 1px solid rgba(36, 24, 15, 0.16);
  border-radius: 50%;
  background: rgba(255, 251, 224, 0.78);
  box-shadow: 0 0.35rem 1rem rgba(36, 24, 15, 0.14);
  color: #24180f;
  cursor: pointer;
  font: inherit;
  font-size: 0.78rem;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.5rem);
  transition:
    opacity 450ms ease,
    transform 450ms ease,
    background-color 200ms ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.music-toggle:hover {
  background: rgba(255, 251, 224, 0.96);
}

.music-toggle.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.music-toggle__play,
.music-toggle__pause {
  grid-area: 1 / 1;
}

/* Triángulo dibujado con CSS */
.music-toggle__play {
  width: 0;
  height: 0;
  border-top: 0.32rem solid transparent;
  border-bottom: 0.32rem solid transparent;
  border-left: 0.52rem solid currentColor;
  transform: translateX(0.07rem);
}

/* Pausa dibujada con CSS */
.music-toggle__pause {
  position: relative;
  display: none;
  width: 0.52rem;
  height: 0.68rem;
}

.music-toggle__pause::before,
.music-toggle__pause::after {
  position: absolute;
  top: 0;
  width: 0.17rem;
  height: 100%;
  border-radius: 1px;
  background: currentColor;
  content: "";
}

.music-toggle__pause::before {
  left: 0;
}

.music-toggle__pause::after {
  right: 0;
}

.music-toggle.is-playing .music-toggle__play {
  display: none;
}

.music-toggle.is-playing .music-toggle__pause {
  display: block;
}

body.is-cover-locked {
    touch-action: pinch-zoom;
  }

@media (min-width: 700px) {
  .cover-intro {
    padding: 2rem;
  }

  .cover-intro__stage {
    filter: drop-shadow(0 1.25rem 2rem rgba(45, 27, 17, 0.24));
  }

  .cover__image {
    max-width: min(calc(100vw - 4rem), var(--cover-max-width));
    max-height: calc(100vh - 4rem);
    max-height: calc(100dvh - 4rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --page-turn-duration: 260ms;
    --cover-tilt: 0deg;
  }

  .cover {
    transition: opacity var(--page-turn-duration) ease;
  }

  .cover-intro.is-ready .cover-intro__stage {
    animation: magazine-fade 260ms ease both;
  }

  .cover-intro.is-open .cover {
    border-radius: 0;
    box-shadow: none;
    filter: none;
    opacity: 0;
    transform: none;
  }

  .cover::before,
  .cover::after {
    display: none;
  }
}

@keyframes magazine-fade {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}