:root {
  --wine: #7a1230;
  --wine-dark: #4f0a20;
  --wine-light: #a72c50;
  --gold: #d8b66b;
  --paper: #fffaf3;
  --ink: #421522;
  color-scheme: light;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  min-height: 100%;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: #fff;
  background-color: #f5c8d2;
  background-image: url("Fondo 0308.svg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

button,
.letter-inner {
  font: inherit;
}

.experience {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  isolation: isolate;
}

.experience::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 46%, rgba(82, 13, 39, 0.08), rgba(43, 7, 22, 0.24)),
    linear-gradient(rgba(36, 5, 18, 0.08), rgba(36, 5, 18, 0.16));
}

.intro,
.envelope-stage {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: max(20px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right))
    max(20px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
}

.intro {
  z-index: 1;
  text-align: center;
  pointer-events: none;
  transition: opacity 1.2s ease, transform 1.2s ease, filter 1.2s ease;
}

.intro-card {
  max-width: min(920px, 92vw);
  padding: clamp(28px, 5vw, 58px) clamp(24px, 7vw, 82px);
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: clamp(22px, 4vw, 36px);
  background: rgba(93, 18, 47, 0.2);
  box-shadow: 0 24px 70px rgba(44, 5, 21, 0.25);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  animation: title-in 1.15s ease both;
}

.intro h1 {
  font-size: clamp(2.35rem, 7vw, 5.6rem);
  font-weight: 750;
  line-height: 1.04;
  letter-spacing: -0.045em;
  text-wrap: balance;
  text-shadow: 0 4px 18px rgba(37, 3, 15, 0.55);
}

.experience.is-arrived .intro {
  opacity: 0.24;
  transform: translateY(-31vh) scale(0.78);
  filter: blur(1px);
}

.experience.is-open .intro {
  opacity: 0.1;
}

.envelope-stage {
  z-index: 2;
  perspective: 1500px;
  pointer-events: none;
}

.envelope-wrap {
  position: relative;
  width: min(760px, 91vw);
  aspect-ratio: 1.62 / 1;
  opacity: 0;
  transform: translate3d(0, 22vh, -900px) scale(0.08);
  transform-style: preserve-3d;
  filter: blur(16px);
  visibility: hidden;
}

.experience.is-arriving .envelope-wrap {
  visibility: visible;
  animation: envelope-arrival 2.6s cubic-bezier(0.16, 0.88, 0.22, 1) forwards;
}

.experience.is-arrived .envelope-wrap {
  visibility: visible;
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
  filter: blur(0);
}

.experience.is-arrived .envelope-stage {
  pointer-events: auto;
}

.envelope {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  filter: drop-shadow(0 30px 42px rgba(45, 5, 20, 0.36));
}

.env-back,
.env-left,
.env-right,
.env-bottom,
.env-flap {
  position: absolute;
  inset: 0;
  border-radius: clamp(15px, 2.6vw, 28px);
}

.env-back {
  z-index: 5;
  background:
    radial-gradient(circle at 50% 110%, rgba(0, 0, 0, 0.2), transparent 62%),
    linear-gradient(145deg, var(--wine-light), var(--wine-dark));
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.env-left,
.env-right,
.env-bottom {
  z-index: 20;
  overflow: hidden;
  background: linear-gradient(150deg, #982747, #661029);
  pointer-events: none;
}

.env-left {
  clip-path: polygon(0 0, 53% 51%, 0 100%);
}

.env-right {
  clip-path: polygon(100% 0, 47% 51%, 100% 100%);
  background: linear-gradient(215deg, #8b1e3d, #5b0c24);
}

.env-bottom {
  clip-path: polygon(0 100%, 50% 43%, 100% 100%);
  background: linear-gradient(180deg, #821735, #5b0b24);
}

.env-flap {
  z-index: 35;
  height: 59%;
  transform: rotateX(0deg);
  transform-origin: top center;
  backface-visibility: visible;
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  background:
    linear-gradient(170deg, rgba(255, 255, 255, 0.12), transparent 38%),
    linear-gradient(180deg, #a62d4f, #70132f);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.seal {
  position: absolute;
  z-index: 42;
  top: 55%;
  left: 50%;
  display: grid;
  width: clamp(62px, 10vw, 88px);
  aspect-ratio: 1;
  place-items: center;
  border: 2px solid rgba(255, 250, 221, 0.5);
  border-radius: 45% 52% 46% 51%;
  color: #fff7dd;
  background:
    radial-gradient(circle at 32% 25%, rgba(255, 255, 255, 0.42), transparent 36%),
    linear-gradient(145deg, #e0c17c, #a9782f);
  box-shadow: 0 12px 24px rgba(45, 5, 20, 0.32);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.35rem, 4vw, 2rem);
  font-weight: 700;
  transform: translate(-50%, -50%) rotate(-4deg);
}

.open-envelope {
  position: absolute;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0 20px clamp(16px, 3.5vw, 28px);
  border: 0;
  border-radius: clamp(15px, 2.6vw, 28px);
  color: #fff;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.open-envelope:disabled {
  cursor: default;
}

.open-envelope span {
  padding: 9px 16px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  background: rgba(47, 5, 20, 0.48);
  box-shadow: 0 8px 22px rgba(45, 5, 20, 0.18);
  font-size: clamp(0.78rem, 2.2vw, 0.95rem);
  font-weight: 650;
  letter-spacing: 0.04em;
  opacity: 0;
  transform: translateY(8px);
  -webkit-backdrop-filter: blur(7px);
  backdrop-filter: blur(7px);
}

.experience.is-arrived .open-envelope span {
  animation: hint-in 0.65s 0.15s ease forwards, hint-breathe 2.4s 0.8s ease-in-out infinite;
}

.open-envelope:focus-visible {
  outline: 3px solid #fff7dd;
  outline-offset: 8px;
}

.letter {
  position: absolute;
  z-index: 10;
  top: 50%;
  left: 50%;
  width: min(860px, calc(100vw - 34px));
  height: min(76vh, 690px);
  height: min(76dvh, 690px);
  overflow: hidden;
  border: 1px solid rgba(122, 18, 48, 0.16);
  border-radius: clamp(16px, 2.8vw, 26px);
  opacity: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(255, 250, 243, 0.94), rgba(255, 250, 243, 0.98)),
    repeating-linear-gradient(0deg, transparent, transparent 30px, rgba(122, 18, 48, 0.05) 31px);
  box-shadow: 0 30px 90px rgba(44, 5, 20, 0.35);
  transform: translate(-50%, 12%) scale(0.52);
  transform-origin: center;
}

.letter::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(202, 162, 77, 0.26);
  border-radius: calc(clamp(16px, 2.8vw, 26px) - 6px);
  pointer-events: none;
}

.letter-inner {
  width: 100%;
  height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  padding: clamp(42px, 7vw, 76px) clamp(30px, 8vw, 86px);
  text-align: left;
  scrollbar-color: rgba(122, 18, 48, 0.34) transparent;
  scrollbar-width: thin;
  overscroll-behavior: contain;
  touch-action: pan-y;
  -webkit-overflow-scrolling: touch;
}

.letter-inner:focus {
  outline: none;
}

.letter h2 {
  margin-bottom: 24px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 500;
  line-height: 1.08;
  text-align: center;
}

.letter p {
  max-width: 680px;
  margin: 0 auto 1em;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  line-height: 1.75;
}

.letter-placeholder {
  color: rgba(66, 21, 34, 0.7);
  font-style: italic;
  text-align: center;
}

.experience.is-opening .open-envelope {
  pointer-events: none;
  opacity: 0;
}

.experience.is-opening .env-flap {
  animation: flap-open 0.85s cubic-bezier(0.2, 0.82, 0.2, 1) forwards;
}

.experience.is-opening .seal {
  animation: seal-open 0.55s ease forwards;
}

.experience.is-opening .letter {
  z-index: 30;
  animation: letter-out 1.55s 0.5s cubic-bezier(0.16, 0.92, 0.2, 1) forwards;
}

.experience.is-opening .env-left,
.experience.is-opening .env-right,
.experience.is-opening .env-bottom,
.experience.is-opening .env-back {
  animation: envelope-away 0.7s 1.25s ease forwards;
}

.experience.is-open .letter {
  z-index: 45;
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

@keyframes title-in {
  from { opacity: 0; transform: translateY(22px) scale(0.98); }
  to { opacity: 1; transform: none; }
}

@keyframes envelope-arrival {
  0% {
    opacity: 0;
    transform: translate3d(0, 22vh, -900px) scale(0.08);
    filter: blur(16px);
  }
  36% { opacity: 0.62; }
  72% {
    transform: translate3d(0, -2vh, 45px) scale(1.035);
    filter: blur(0);
  }
  100% {
    opacity: 1;
    transform: translate3d(0, 0, 0) scale(1);
    filter: blur(0);
  }
}

@keyframes hint-in {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes hint-breathe {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-3px) scale(1.025); }
}

@keyframes flap-open {
  0% { transform: rotateX(0deg); }
  100% { transform: rotateX(168deg); z-index: 6; }
}

@keyframes seal-open {
  0% { opacity: 1; transform: translate(-50%, -50%) rotate(-4deg) scale(1); }
  65% { transform: translate(-50%, -72%) rotate(3deg) scale(1.1); }
  100% { opacity: 0; transform: translate(-50%, -90%) rotate(6deg) scale(0.86); }
}

@keyframes letter-out {
  0% { opacity: 0; transform: translate(-50%, 12%) scale(0.52); }
  20% { opacity: 1; }
  58% { transform: translate(-50%, -74%) scale(0.68); }
  100% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

@keyframes envelope-away {
  to { opacity: 0.22; transform: translateY(18%) scale(0.92); filter: blur(2px); }
}

.no-script {
  position: fixed;
  right: 16px;
  bottom: 16px;
  left: 16px;
  z-index: 100;
  padding: 12px 16px;
  border-radius: 12px;
  text-align: center;
  background: rgba(79, 10, 32, 0.9);
}

@media (max-width: 600px) {
  .intro h1 {
    font-size: clamp(2.45rem, 13vw, 4rem);
  }

  .experience.is-arrived .intro {
    transform: translateY(-34vh) scale(0.72);
  }

  .envelope-wrap {
    width: min(94vw, 540px);
  }

  .letter {
    width: calc(100vw - 28px);
    height: min(84vh, 760px);
    height: min(84dvh, 760px);
  }

  .letter-inner {
    padding: 38px 26px 52px;
  }
}

@media (max-height: 560px) and (orientation: landscape) {
  .envelope-wrap {
    width: min(68vw, 620px);
  }

  .experience.is-arrived .intro {
    transform: translateY(-36vh) scale(0.68);
  }

  .letter {
    height: calc(100dvh - 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .intro-card {
    animation-duration: 0.01ms;
  }

  .intro {
    transition-duration: 0.15s;
  }

  .experience.is-arriving .envelope-wrap {
    animation: envelope-arrival-reduced 0.2s ease forwards;
  }

  .experience.is-arrived .open-envelope span {
    animation: hint-in 0.15s ease forwards;
  }

  .experience.is-opening .env-flap {
    animation: flap-open 0.2s ease forwards;
  }

  .experience.is-opening .seal {
    animation: seal-open 0.15s ease forwards;
  }

  .experience.is-opening .letter {
    animation: letter-out-reduced 0.25s 0.1s ease forwards;
  }

  .experience.is-opening .env-left,
  .experience.is-opening .env-right,
  .experience.is-opening .env-bottom,
  .experience.is-opening .env-back {
    animation: envelope-away 0.15s 0.15s ease forwards;
  }
}

@keyframes envelope-arrival-reduced {
  from { opacity: 0; transform: scale(0.96); filter: none; }
  to { opacity: 1; transform: none; filter: none; }
}

@keyframes letter-out-reduced {
  from { opacity: 0; transform: translate(-50%, -48%) scale(0.98); }
  to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}