/* =============================================================================
   SECTION 6 · THE FINAL LETTER
   ========================================================================== */

.letter-section {
  overflow: hidden;
  background:
    radial-gradient(70% 50% at 50% 70%, rgba(247, 221, 226, .8), rgba(247, 221, 226, 0) 75%);
}

.letter-stage {
  position: relative;
  z-index: 1;
  display: grid;
  justify-items: center;
}

.letter-env-wrap {
  display: grid;
  justify-items: center;
  gap: 34px;
  padding-top: 40px;
  transition: opacity .5s ease, transform .7s var(--ease-out), filter .5s;
}
.letter-env-wrap.is-opening .letter-btn {
  opacity: 0;
  transform: scale(.95);
  pointer-events: none;
}
.letter-env-wrap.is-done {
  opacity: 0;
  transform: translateY(50px) scale(.9);
  filter: blur(3px);
}

/* Cream & kraft envelope with a heart-patterned liner */
.envelope--letter {
  --env-w: min(88vw, 500px);
  --env-back: #E5CFB7;
  --env-front: #F6EADB;
  --env-flap: #F2E3D1;
  --env-flap-edge: #E8D3BC;
  --env-liner:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='22' height='22' viewBox='0 0 22 22'%3E%3Cpath d='M11 15.5c-2.6-2-4.5-3.6-4.5-5.6 0-1.3 1-2.3 2.2-2.3.9 0 1.7.5 2.3 1.4.6-.9 1.4-1.4 2.3-1.4 1.2 0 2.2 1 2.2 2.3 0 2-1.9 3.6-4.5 5.6z' fill='%23C93E54' fill-opacity='.5'/%3E%3C/svg%3E") 0 0 / 22px 22px,
    var(--blush);
}
.envelope--letter .env-seal { width: 66px; height: 66px; margin: -35px 0 0 -33px; }
.envelope--letter .env-seal .icon { width: 28px; height: 28px; }
.envelope--letter .env-paper-text { font-size: 2rem; }

.env-address {
  position: absolute;
  left: 8%;
  bottom: 12%;
  display: grid;
  gap: 0;
  font-family: var(--font-hand);
  font-size: clamp(1.1rem, 4.6vw, 1.6rem);
  font-weight: 600;
  line-height: 1.15;
  color: var(--ink-2);
  text-align: left;
  transform: rotate(-2deg);
}
.env-address span:first-child { color: var(--plum); font-weight: 700; }

.env-stamp {
  position: absolute;
  right: 6%;
  bottom: 10%;
  width: 17%;
  aspect-ratio: 4 / 5;
  padding: 5px;
  background: var(--paper);
  transform: rotate(5deg);
  filter: drop-shadow(0 2px 2px rgba(73, 52, 61, .15));
  -webkit-mask:
    linear-gradient(#000 0 0) center / calc(100% - 8px) calc(100% - 8px) no-repeat,
    radial-gradient(circle at 4px 4px, #0000 2.4px, #000 2.9px) -4px -4px / 8px 8px;
  mask:
    linear-gradient(#000 0 0) center / calc(100% - 8px) calc(100% - 8px) no-repeat,
    radial-gradient(circle at 4px 4px, #0000 2.4px, #000 2.9px) -4px -4px / 8px 8px;
}
.env-stamp-inner {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 2px;
  height: 100%;
  background: var(--cherry);
  color: var(--cream);
  text-align: center;
}
.env-stamp-inner .icon { width: 42%; height: auto; aspect-ratio: 1; }
.env-stamp-inner b {
  font-size: clamp(.45rem, 1.6vw, .66rem);
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.env-postmark {
  position: absolute;
  right: 18%;
  bottom: 18%;
  width: 26%;
  color: rgba(73, 52, 61, .32);
  transform: rotate(-8deg);
}
.env-postmark svg { width: 100%; height: auto; }

@media (max-width: 420px) {
  .env-postmark { display: none; }
}

/* ---------- The letter itself ---------------------------------------------- */
.letter-paper {
  position: relative;
  width: min(100%, 660px);
  padding: clamp(30px, 6vw, 60px) clamp(22px, 6vw, 64px) clamp(30px, 5vw, 50px);
  border-radius: 6px;
  background:
    linear-gradient(to bottom, rgba(73, 52, 61, 0) 33.2%, rgba(73, 52, 61, .06) 33.33%, rgba(255, 255, 255, .7) 33.5%, rgba(73, 52, 61, 0) 34.5%,
      rgba(73, 52, 61, 0) 66.5%, rgba(73, 52, 61, .06) 66.66%, rgba(255, 255, 255, .7) 66.8%, rgba(73, 52, 61, 0) 67.8%),
    var(--paper);
  box-shadow: var(--shadow-lg), inset 0 0 0 1px var(--line);
  outline: none;
}
.letter-paper.is-unfolding { animation: unfold 1.4s var(--ease-out) both; }
@keyframes unfold {
  0% {
    opacity: 0;
    clip-path: inset(40% 6% 40% 6% round 6px);
    transform: translateY(60px) perspective(900px) rotateX(24deg) scale(.9);
  }
  25% { opacity: 1; }
  65% { clip-path: inset(0 0 0 0 round 6px); }
  100% {
    opacity: 1;
    clip-path: inset(0 0 0 0 round 6px);
    transform: none;
  }
}
.letter-paper.is-folding { animation: fold-away .55s var(--ease-in-out) forwards; }
@keyframes fold-away {
  to { opacity: 0; clip-path: inset(42% 6% 42% 6% round 6px); transform: translateY(30px) scale(.94); }
}

.letter-paper .tape { top: -12px; --tape-rot: 3deg; }

.letter-date {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  text-align: right;
}
.letter-greeting {
  margin: 10px 0 18px;
  font-family: var(--font-hand);
  font-size: clamp(2.4rem, 8vw, 3.3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cherry);
  outline: none;
}
.letter-body p {
  margin-bottom: .65em;
  font-family: var(--font-hand);
  font-size: clamp(1.45rem, 4.8vw, 1.85rem);
  font-weight: 500;
  line-height: 1.28;
  color: var(--plum);
  text-wrap: pretty;
}
.letter-closing {
  margin-top: 1.2em;
  font-family: var(--font-hand);
  font-size: clamp(1.5rem, 5vw, 1.9rem);
  font-weight: 600;
}
.letter-sign {
  position: relative;
  display: inline-block;
  font-family: var(--font-hand);
  font-size: clamp(2rem, 7vw, 2.7rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cherry);
  transform: rotate(-2deg);
}
.letter-sign svg {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -.25em;
  width: 100%;
  height: .4em;
  overflow: visible;
}
.letter-sign path {
  fill: none;
  stroke: var(--rose);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 400;
  stroke-dashoffset: 400;
}

/* Ink settling, line by line */
.letter-line { opacity: 0; transform: translateY(8px); filter: blur(5px); }
.is-writing .letter-line {
  animation: ink 1s var(--ease-out) forwards;
  animation-delay: calc(.9s + var(--i) * .5s);
}
.is-writing .letter-sign path {
  animation: draw 1.2s var(--ease-out) forwards;
  animation-delay: calc(1.6s + var(--i) * .5s);
}
@keyframes ink { to { opacity: 1; transform: none; filter: blur(0); } }

.letter-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1.5px dashed var(--line-strong);
}

/* ---------- Floating hearts while reading ---------------------------------- */
.letter-hearts {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.5s ease;
}
.letter-section.is-reading .letter-hearts { opacity: 1; }
.float-heart {
  position: absolute;
  bottom: -40px;
  width: var(--s, 16px);
  height: var(--s, 16px);
  color: var(--c, var(--rose));
  opacity: 0;
  animation: float-up var(--dur, 12s) linear var(--delay, 0s) infinite;
  animation-play-state: paused;
}
.letter-section.is-reading .float-heart { animation-play-state: running; }
.float-heart svg { width: 100%; height: 100%; fill: currentColor; animation: sway 3.2s ease-in-out infinite alternate; }
@keyframes float-up {
  0% { opacity: 0; transform: translateY(0) rotate(-10deg); }
  10% { opacity: var(--o, .7); }
  85% { opacity: var(--o, .7); }
  100% { opacity: 0; transform: translateY(calc(-1 * var(--h, 900px))) rotate(14deg); }
}
@keyframes sway {
  from { transform: translateX(-12px); }
  to { transform: translateX(12px); }
}

@media (prefers-reduced-motion: reduce) {
  .letter-hearts { display: none; }
  .letter-line { filter: none; }
}