.js-hide {
  display: none !important;
}
.js-hide {
  display: none !important;
}
@media (min-width: 601px) {
  .envelope-wrap.is-expanded .paper-body {
    padding-bottom: 120px;
    height: auto;
    display: block;
  }
}
@media (min-width: 601px) {
  .envelope-wrap.is-expanded .paper-body {
    padding-bottom: 120px;
  }
  .envelope-wrap.is-expanded .paper {
    position: relative;
  }
  .envelope-wrap.is-expanded .paper .next-page-btn,
  .envelope-wrap.is-expanded .paper .back-page-btn {
    position: absolute !important;
    bottom: 36px !important;
    z-index: 10;
    font-size: 20px !important;
    padding: 10px 26px !important;
    border-radius: 12px;
    background: #fffbe7;
    color: #1b2c8e;
    border: 2px solid #1b2c8e;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    cursor: pointer;
    user-select: none;
    transform: rotate(-1.5deg);
  }
  .envelope-wrap.is-expanded .paper .next-page-btn {
    right: 48px !important;
    left: auto !important;
  }
  .envelope-wrap.is-expanded .paper .back-page-btn {
    left: 48px !important;
    right: auto !important;
  }
}
/* Anchor desktop nav buttons at the same position for all pages */
@media (min-width: 601px) {
  .envelope-wrap.is-expanded .paper {
    position: relative;
  }
  .envelope-wrap.is-expanded .next-page-btn,
  .envelope-wrap.is-expanded .back-page-btn {
    position: absolute !important;
    bottom: 36px !important;
    z-index: 10;
    font-size: 20px !important;
    padding: 10px 26px !important;
    border-radius: 12px;
    background: #fffbe7;
    color: #1b2c8e;
    border: 2px solid #1b2c8e;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    cursor: pointer;
    user-select: none;
    transform: rotate(-1.5deg);
  }
  .envelope-wrap.is-expanded .next-page-btn {
    right: 48px !important;
    left: auto !important;
  }
  .envelope-wrap.is-expanded .back-page-btn {
    left: 48px !important;
    right: auto !important;
  }
}
@media (max-width: 600px) {
  .envelope-wrap.is-expanded .paper {
    position: relative;
  }
  .envelope-wrap.is-expanded .next-page-btn,
  .envelope-wrap.is-expanded .back-page-btn {
    position: absolute !important;
    bottom: 44px !important;
    z-index: 10;
    font-size: 13px !important;
    padding: 5px 8px !important;
    min-width: 70px;
    max-width: 140px;
    width: auto;
    border-radius: 8px;
    margin-bottom: 0;
    margin-top: 0;
    box-sizing: border-box;
  }
  .envelope-wrap.is-expanded .next-page-btn {
    right: 10px !important;
    left: auto !important;
  }
  .envelope-wrap.is-expanded .back-page-btn {
    left: 10px !important;
    right: auto !important;
  }
}
/* Cartoony, exaggerated, responsive envelope + paper letter */

:root {
  --bg: #ffe6ea;
  --ink: #3a2323;
  --paper: #fffbe7;

  /* Sketch envelope palette */
  --env-ink: #1b2c8e;
  --env-fill: #fffdf6;
  --flap-fill: #ffffff;

  /* How far the paper slides out when the envelope opens (negative = upward). */
  --letter-open-y: -42%;
}

html, body {
  height: 100%;
}

body {
  background: var(--bg);
  margin: 0;
  display: grid;
  place-items: center;
  overflow-x: hidden;
}

#hearts-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: auto;
  z-index: 0;
}

.stage {
  width: 100vw;
  height: 100vh;
  display: grid;
  place-items: center;
  position: relative;
  z-index: 1;
  pointer-events: none;
}

.envelope-wrap {
  pointer-events: auto;
}

.envelope-wrap {
  position: relative;
  /* Use fit-content so the div wraps the SVG's actual drawing, not a big box */
  width: fit-content;
  height: fit-content;
  filter: drop-shadow(0 10px 26px rgba(0,0,0,0.14));
  perspective: 1200px;
}

#envelope-svg {
  width: 100%;
  height: 100%;
  display: block;
  cursor: default;
  transform-style: preserve-3d;
  position: relative;
  z-index: 10;
  /* Prevent the whole SVG box from acting like a giant hit target.
     We re-enable pointer events only on the painted envelope group. */
  pointer-events: none;
}

/* Click target: only the painted envelope art */
#env-click {
  cursor: pointer;
  pointer-events: visiblePainted;
}

/* Flap animation: closed (down) -> open (up/back) */
#flap-group {
  transform-box: view-box;
  transform-origin: 160px 92px;
  transform: rotateX(0deg) translateZ(0);
  transform-style: preserve-3d;
  backface-visibility: hidden;
  transition: transform 0.85s cubic-bezier(.22, 1.6, .25, 1);
}

.envelope-wrap.is-open #flap-group {
  transform: rotateX(-160deg);
}

/* Letter as real paper (HTML) so it looks like a letter */
.letter {
  position: absolute;
  left: 50%;
  bottom: 18%;
  width: 78%;
  height: 56%;
  z-index: 20;
  border: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
  transform: translate(-50%, 18%) scaleY(0.15);
  opacity: 0;
  pointer-events: none;
  transition:
    transform 0.85s cubic-bezier(.22, 1.6, .25, 1),
    opacity 0.28s ease;
}

.envelope-wrap.is-open .letter {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, var(--letter-open-y)) scaleY(1) rotate(-1deg);
}

.paper {
  position: relative;
  height: 100%;
  background: var(--paper);
  border: 5px solid rgba(27,44,142,0.75);
  border-radius: 14px;
  box-shadow: 0 10px 0 rgba(58,35,35,0.22);
  overflow: hidden;
}

.paper::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 10%, rgba(255,255,255,0.55), rgba(255,255,255,0) 40%),
    repeating-linear-gradient(
      to bottom,
      rgba(215,38,96,0.0) 0px,
      rgba(215,38,96,0.0) 18px,
      rgba(215,38,96,0.08) 19px,
      rgba(215,38,96,0.08) 20px
    );
  pointer-events: none;
  opacity: 0.8;
}

.paper-body {
  position: relative;
  padding: 18px 18px 18px;
  text-align: center;
  z-index: 1;
  font-family: 'Comic Neue', 'Comic Sans MS', 'Comic Sans', cursive;
  color: #d72660;
}

.paper-body h2 {
  margin: 16px 0 10px;
  font-size: 28px;
  font-family: 'Comic Neue', 'Comic Sans MS', 'Comic Sans', cursive;
  font-weight: bold;
}

.paper-body p {
  margin: 10px 0;
  font-size: 24px;
  opacity: 0.96;
  font-family: 'Comic Neue', 'Comic Sans MS', 'Comic Sans', cursive;
}

/* Expanded letter should read like a real note (left aligned) */
.envelope-wrap.is-expanded .paper-body {
  text-align: left;
  /* extra bottom padding so paging buttons always fit */
  padding: 28px 34px 96px;
}

.envelope-wrap.is-expanded .paper-body h2 {
  margin-top: 10px;
}

.envelope-wrap.is-expanded .paper-body p {
  line-height: 1.6;
  max-width: 60ch;
  opacity: 1;
}

/* Collapsed state: no text, just subtle hint lines */
.peek-lines {
  margin-top: 10px;
  display: grid;
  gap: 9px;
  justify-items: start;
}

.letter-content {
  display: none;
}

.envelope-wrap.is-expanded .peek-lines {
  display: none;
}

.envelope-wrap.is-expanded .letter-content {
  display: block;
}

.peek-lines span {
  height: 7px;
  border-radius: 999px;
  background: rgba(215, 38, 96, 0.18);
}

.peek-lines span:nth-child(1) { width: 78%; }
.peek-lines span:nth-child(2) { width: 70%; }
.peek-lines span:nth-child(3) { width: 74%; }
.peek-lines span:nth-child(4) { width: 62%; }
.peek-lines span:nth-child(5) { width: 76%; }
.peek-lines span:nth-child(6) { width: 58%; }
.peek-lines span:nth-child(7) { width: 72%; }
.peek-lines span:nth-child(8) { width: 66%; }
.peek-lines span:nth-child(9) { width: 44%; }

.peek-lines span:nth-child(n+10) {
  width: 70%;
  opacity: 0.9;
}

.envelope-wrap.is-expanded .signature {
  margin-top: 18px;
  font-size: 18px;
}

/* Expanded letter becomes a modal-like paper */
.envelope-wrap.is-expanded .letter {
  position: fixed;
  left: 50%;
  top: 50%;
  bottom: auto;
  width: min(720px, 92vw);
  height: min(76vh, 720px);
  transform: translate(-50%, -50%) rotate(-1.5deg) scale(1);
  opacity: 1;
  z-index: 50;
}

.envelope-wrap.is-expanded .paper {
  border-radius: 18px;
  box-shadow: 0 18px 0 rgba(58,35,35,0.22), 0 30px 70px rgba(0,0,0,0.22);
  height: 76vh;
  min-height: 180px;
  max-height: 76vh;
  overflow-y: hidden;
}

@media (max-width: 600px) {
  .envelope-wrap.is-expanded .paper {
    height: 54vh;
    max-height: 54vh;
    min-height: 120px;
  }

  .envelope-wrap.is-expanded .paper-body {
    padding-bottom: 120px;
  }
  .envelope-wrap.is-expanded .paper-body h2 {
    font-size: 17px;
    margin: 8px 0 5px;
  }
  .envelope-wrap.is-expanded .paper-body p {
    font-size: 13px;
    margin: 5px 0;
  }
  .envelope-wrap.is-expanded .signature {
    font-size: 12px;
  }

/* Always hide nav buttons unless expanded */
.next-page-btn, .back-page-btn {
  display: none !important;
}
.envelope-wrap.is-expanded .next-page-btn,
.envelope-wrap.is-expanded .back-page-btn {
  display: block !important;
}