@font-face {
  font-family: "Makina";
  src: url("fonts/makina.otf") format("opentype");
  font-display: swap;
}

@font-face {
  font-family: "Lavonia";
  src: url("fonts/ed-lavonia.ttf") format("truetype");
  font-display: swap;
}

:root {
  --burgundy: #4c050c;
  --blue: #89bff1;
  --cream: #fdf9ed;
  --shadow: rgba(22, 0, 4, 0.38);
  --envelope-width: min(94vw, 690px, 64svh);
  --envelope-shift: 36px;
  --letter-width: min(82vw, 540px, 66svh);
  --motion-length: 2400ms;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; margin: 0; }

body {
  overflow-x: hidden;
  color: var(--cream);
  background: radial-gradient(circle at 50% 44%, #6b1420 0, var(--burgundy) 67%);
  font-family: "Makina", "Courier New", monospace;
}

button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }

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

.experience {
  display: grid;
  min-height: 100svh;
  place-items: center;
  isolation: isolate;
}

.animation-stage {
  position: relative;
  grid-area: 1 / 1;
  width: 100%;
  height: 100svh;
  overflow: hidden;
  isolation: isolate;
}

.envelope-layer,
.envelope-trigger {
  position: absolute;
  top: calc(50% + var(--envelope-shift));
  left: 50%;
  width: var(--envelope-width);
  aspect-ratio: 1182 / 786;
  transform: translate(-50%, -50%);
}

.envelope-layer { pointer-events: none; }
.envelope-layer img { display: block; width: 100%; height: 100%; }

.envelope-open-back {
  z-index: 1;
  opacity: 0;
  filter: drop-shadow(0 24px 19px var(--shadow));
}

.envelope-open-back::before {
  position: absolute;
  inset: 0;
  background: linear-gradient(#e7f2f4, #cde3eb);
  content: "";
}

.envelope-open-back img { position: relative; }

.envelope-opened-flap { z-index: 1; opacity: 0; }
.envelope-opened-flap img { transform: translateY(-100%); }

.envelope-front { z-index: 3; opacity: 0; }

.envelope-closed-body {
  z-index: 4;
  filter: drop-shadow(0 24px 19px var(--shadow));
}

.envelope-flap { z-index: 5; perspective: 1400px; }

.flap-rotator {
  position: absolute;
  inset: 0;
  transform-origin: 50% 0;
  transform-style: preserve-3d;
}

.flap-rotator img {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
}

.envelope-trigger {
  z-index: 8;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.envelope-trigger:focus-visible,
.again-button:focus-visible,
.dialog-close:focus-visible,
.calendar-options a:focus-visible {
  outline: 3px solid var(--cream);
  outline-offset: 5px;
}

.scene-hint {
  position: absolute;
  left: 50%;
  width: max-content;
  max-width: 100vw;
  color: var(--cream);
  font-size: clamp(0.64rem, 1.8vw, 0.77rem);
  letter-spacing: 0.2em;
  text-align: center;
  white-space: nowrap;
  transform: translateX(-50%);
  pointer-events: none;
}

.envelope-hint {
  z-index: 9;
  top: calc(50% + var(--envelope-shift) + min(31.3vw, 230px, 23svh) + 18px);
}

.letter-scene {
  position: absolute;
  z-index: 2;
  width: var(--letter-width);
  aspect-ratio: 1253 / 1540;
  visibility: visible;
  pointer-events: none;
  transform: translateY(var(--start-y, 150px)) scale(0.74);
  transform-origin: 50% 0;
  will-change: transform;
}

.letter-paper {
  display: block;
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 23px 22px rgba(22, 0, 4, 0.34));
  clip-path: inset(0 0 var(--start-clip, 28%) 0);
}

.calendar-ticket {
  position: absolute;
  top: 63.5%;
  left: 76%;
  width: 34%;
  padding: 0;
  border: 0;
  background: transparent;
  opacity: 0;
  cursor: pointer;
  pointer-events: none;
}

.calendar-ticket img {
  display: block;
  width: 100%;
  height: auto;
  filter: drop-shadow(0 7px 6px rgba(22, 0, 4, 0.24));
  transform-origin: center;
}

.calendar-ticket:hover img {
  animation: none !important;
  filter: drop-shadow(0 10px 9px rgba(22, 0, 4, 0.35));
  transform: translateY(-3px) scale(1.04);
}

.calendar-ticket:focus-visible { outline: none; }
.calendar-ticket:focus-visible img {
  filter: drop-shadow(0 0 7px var(--cream)) drop-shadow(0 6px 7px rgba(22, 0, 4, 0.35));
}

.letter-hint {
  top: calc(100% + 15px);
  opacity: 0;
}

.experience[data-stage="opening"] .envelope-trigger,
.experience[data-stage="opening"] .envelope-hint {
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
}

.experience[data-stage="opening"] .envelope-open-back,
.experience[data-stage="opening"] .envelope-front {
  animation: envelope-open-and-exit var(--motion-length) ease both;
}

.experience[data-stage="opening"] .envelope-opened-flap {
  animation: opened-flap-appears var(--motion-length) ease both;
}

.experience[data-stage="opening"] .envelope-closed-body {
  animation: closed-body-clears var(--motion-length) ease both;
}

.experience[data-stage="opening"] .envelope-flap {
  animation: envelope-exits var(--motion-length) ease both;
}

.experience[data-stage="opening"] .flap-rotator {
  animation: flap-swings var(--motion-length) cubic-bezier(0.2, 0.68, 0.18, 1) both;
}

.experience[data-stage="opening"] .letter-scene {
  visibility: visible;
  animation: letter-rises var(--motion-length) cubic-bezier(0.18, 0.73, 0.18, 1) both;
}

.experience[data-stage="opening"] .letter-paper {
  animation: letter-unmasks var(--motion-length) ease both;
}

.experience[data-stage="opening"] .calendar-ticket {
  animation: ticket-appears var(--motion-length) ease both;
}

.experience[data-stage="revealed"] .envelope-layer,
.experience[data-stage="revealed"] .envelope-trigger,
.experience[data-stage="revealed"] .envelope-hint,
.experience[data-stage="finished"] .envelope-layer,
.experience[data-stage="finished"] .envelope-trigger,
.experience[data-stage="finished"] .envelope-hint {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.experience[data-stage="revealed"] .letter-scene,
.experience[data-stage="finished"] .letter-scene {
  visibility: visible;
  transform: none;
}

.experience[data-stage="revealed"] .letter-scene { pointer-events: auto; }
.experience[data-stage="revealed"] .letter-paper { clip-path: inset(0); }

.experience[data-stage="revealed"] .calendar-ticket {
  opacity: 1;
  pointer-events: auto;
}

.experience[data-stage="revealed"] .calendar-ticket img {
  animation: ticket-nudge 4.2s ease-in-out infinite;
}

.experience[data-calendar-open="true"] .calendar-ticket img { animation-play-state: paused; }
.experience[data-stage="revealed"] .letter-hint { opacity: 1; }

.experience[data-stage="finished"] .animation-stage {
  opacity: 0;
  pointer-events: none;
  transition: opacity 540ms ease;
}

.final-scene {
  position: relative;
  z-index: 10;
  grid-area: 1 / 1;
  width: min(91vw, 480px, 52svh);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(35px) scale(0.96);
  transition: opacity 760ms 190ms ease, transform 900ms cubic-bezier(0.16, 0.74, 0.2, 1), visibility 0s 900ms;
}

.final-scene img {
  display: block;
  width: 100%;
  height: auto;
  filter: drop-shadow(0 25px 21px var(--shadow));
}

.experience[data-stage="finished"] .final-scene {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
  transition-delay: 180ms, 0ms, 0ms;
}

.again-button {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  width: max-content;
  max-width: 90vw;
  padding: 8px 12px;
  border: 0;
  color: var(--cream);
  background: transparent;
  font-size: clamp(0.64rem, 1.8vw, 0.75rem);
  letter-spacing: 0.16em;
  cursor: pointer;
  transform: translateX(-50%);
}

.again-button:hover { text-decoration: underline; text-underline-offset: 5px; }

@keyframes flap-swings {
  0%, 4% { transform: rotateX(0deg); }
  17% { transform: rotateX(-82deg); }
  34%, 100% { transform: rotateX(-177deg); }
}

@keyframes envelope-open-and-exit {
  0%, 42% { opacity: 1; transform: translate(-50%, -50%); }
  92%, 100% { opacity: 1; transform: translate(-50%, calc(-50% + var(--exit-y, 550px))); }
}

@keyframes closed-body-clears {
  0%, 100% { opacity: 0; transform: translate(-50%, -50%); }
}

@keyframes envelope-exits {
  0%, 20% { opacity: 1; transform: translate(-50%, -50%); }
  27%, 100% { opacity: 0; transform: translate(-50%, -50%); }
}

@keyframes opened-flap-appears {
  0%, 16.9% { opacity: 0; transform: translate(-50%, -50%); }
  17%, 42% { opacity: 1; transform: translate(-50%, -50%); }
  92%, 100% { opacity: 1; transform: translate(-50%, calc(-50% + var(--exit-y, 550px))); }
}

@keyframes letter-rises {
  0%, 34% { transform: translateY(var(--start-y, 150px)) scale(0.74); }
  67% { transform: translateY(var(--mid-y, 32px)) scale(0.94); }
  90% { transform: translateY(-7px) scale(1.012); }
  100% { transform: none; }
}

@keyframes letter-unmasks {
  0%, 34% { clip-path: inset(0 0 var(--start-clip, 28%) 0); }
  64%, 100% { clip-path: inset(0); }
}

@keyframes ticket-appears {
  0%, 90% { opacity: 0; }
  100% { opacity: 1; }
}

@keyframes ticket-nudge {
  0%, 67%, 100% { transform: translateY(0) rotate(0deg); }
  72% { transform: translateY(-2px) rotate(-3deg); }
  78% { transform: translateY(1px) rotate(2.5deg); }
  84% { transform: translateY(-1px) rotate(-1.5deg); }
  90% { transform: translateY(0) rotate(0deg); }
}

.calendar-dialog {
  width: min(92vw, 530px);
  max-height: calc(100svh - 24px);
  padding: 0;
  overflow-y: auto;
  border: 3px solid var(--blue);
  color: var(--burgundy);
  background: var(--cream);
  font-family: "Courier New", monospace;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.48);
}

.calendar-dialog::backdrop {
  background: rgba(35, 0, 6, 0.78);
  backdrop-filter: blur(4px);
}

.calendar-paper { position: relative; padding: clamp(24px, 5vw, 36px); }

.dialog-close {
  position: absolute;
  top: 8px;
  right: 12px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  color: var(--burgundy);
  background: transparent;
  font-family: Arial, sans-serif;
  font-size: 30px;
  line-height: 1;
  cursor: pointer;
}

.calendar-kicker {
  margin: 0 0 11px;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
}

.calendar-dialog h2 {
  margin: 0;
  font-family: "Lavonia", cursive;
  font-size: clamp(2.8rem, 9vw, 4.2rem);
  font-weight: 400;
  line-height: 0.95;
}

.calendar-details {
  margin: 21px 0 23px;
  font-size: clamp(0.84rem, 2.3vw, 0.97rem);
  line-height: 1.65;
}

.calendar-details strong { font-weight: 400; }
.calendar-options { display: grid; gap: 10px; }

.calendar-options a {
  display: flex;
  min-height: 52px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border: 2px solid var(--burgundy);
  color: var(--burgundy);
  background: var(--blue);
  font-size: clamp(0.84rem, 2.3vw, 0.97rem);
  font-weight: 700;
  text-decoration: none;
  transition: background 150ms ease, transform 150ms ease;
}

.calendar-options a:hover { background: #acd6fb; transform: translateY(-2px); }
.calendar-options a span { font-family: Arial, sans-serif; font-size: 1.2rem; }

.calendar-note {
  margin: 18px 0 0;
  font-size: 0.81rem;
  line-height: 1.5;
}

@media (max-width: 600px) {
  :root {
    --envelope-width: min(94vw, 64svh);
    --letter-width: min(80vw, 69svh);
  }
  .scene-hint { letter-spacing: 0.13em; }
  .final-scene { width: min(96vw, 50svh); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
    transition-delay: 0ms !important;
  }
  .experience[data-stage="revealed"] .calendar-ticket img { animation: none; }
}