/*
 * Les enveloppes « Ouvre quand… » et la lettre ouverte (dialog).
 *
 * Direction : vrai papier. Enveloppes crème légèrement de travers avec sceau de
 * cire ; une fois ouverte, le sceau disparaît et le rabat s'ouvre.
 */
.letters {
  padding: var(--space-section) var(--space-m);
}

.letters__header {
  max-width: 40rem;
  margin: 0 auto var(--space-l);
  text-align: center;
}

.letters__title {
  margin: 0;
  font-family: var(--font-hand);
  font-size: clamp(3rem, 2rem + 4vw, 5.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.letters__intro {
  margin-top: var(--space-s);
  color: var(--ink-soft);
}

.letters__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr));
  gap: var(--space-l) var(--space-m);
  max-width: 64rem;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.envelope {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  width: 100%;
  aspect-ratio: 4 / 3;
  padding: var(--space-m);
  border: 0;
  border-radius: 4px;
  background: linear-gradient(160deg, var(--paper) 0%, var(--paper-edge) 100%);
  box-shadow: var(--shadow-photo);
  color: var(--paper-ink);
  text-align: left;
  overflow: hidden;
  transition: transform var(--duration-normal) var(--ease-out-expo), box-shadow var(--duration-normal);
}

.letters__grid li:nth-child(3n + 1) .envelope { rotate: -1.5deg; }
.letters__grid li:nth-child(3n + 2) .envelope { rotate: 1deg; }
.letters__grid li:nth-child(3n) .envelope { rotate: -0.5deg; }

.envelope:hover,
.envelope:focus-visible {
  transform: translateY(-8px) rotate(0.5deg);
  box-shadow: 0 30px 50px -15px rgb(0 0 0 / 0.7);
}

/* Rabat triangulaire. */
.envelope__flap {
  position: absolute;
  inset: 0 0 auto;
  height: 40%;
  background: linear-gradient(180deg, #efe2cd, #e4d3b9);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform-origin: top;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.envelope__seal {
  position: absolute;
  top: 40%;
  left: 50%;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #d0485f, var(--seal) 60%, #6e1526);
  box-shadow: 0 2px 4px rgb(0 0 0 / 0.35);
  transform: translate(-50%, -50%);
  transition: opacity var(--duration-normal), transform var(--duration-normal) var(--ease-out-expo);
}

.envelope__seal::after {
  content: '♥';
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  color: rgb(255 220 225 / 0.75);
}

.envelope__prefix {
  position: relative;
  font-family: var(--font-mono);
  font-size: var(--text-small);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #8a6a5c;
}

.envelope__when {
  position: relative;
  font-family: var(--font-hand);
  font-size: clamp(1.6rem, 1.3rem + 0.8vw, 2rem);
  font-weight: 500;
  line-height: 1.1;
}

.envelope.is-opened .envelope__flap {
  transform: scaleY(-0.35);
}

.envelope.is-opened .envelope__seal {
  opacity: 0;
  transform: translate(-50%, -50%) scale(1.4);
}

/* ── La lettre ouverte ────────────────────────────────────────────────────── */
.letter-dialog {
  width: min(100% - 2rem, 40rem);
  max-height: min(90vh, 60rem);
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--paper-ink);
  overflow-y: auto;
}

.letter-dialog[open] {
  animation: letter-in 700ms var(--ease-out-expo);
}

.letter-dialog::backdrop {
  background: rgb(10 6 8 / 0.75);
  backdrop-filter: blur(4px);
}

.letter {
  padding: clamp(1.75rem, 1rem + 4vw, 3.5rem);
  background:
    repeating-linear-gradient(180deg, transparent 0 2.05rem, rgb(120 90 70 / 0.12) 2.05rem calc(2.05rem + 1px)),
    var(--paper);
  box-shadow: 0 40px 80px -20px rgb(0 0 0 / 0.8);
}

.letter__title {
  margin: 0 0 var(--space-m);
  font-family: var(--font-hand);
  font-size: clamp(2rem, 1.5rem + 2vw, 2.8rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--seal);
}

.letter__paragraph {
  margin: 0 0 1em;
  line-height: 1.75;
}

.letter__photo {
  margin: var(--space-m) auto;
  border: 8px solid #fff;
  box-shadow: var(--shadow-photo);
  rotate: -1.5deg;
}

.letter__voice-wrap {
  margin: var(--space-m) 0;
}

.letter__voice-label {
  margin: 0 0 0.4rem;
  font-family: var(--font-hand);
  font-size: 1.5rem;
}

.letter__voice {
  width: 100%;
}

.letter__close {
  margin-top: var(--space-m);
  padding: 0.6rem 1.3rem;
  border: 1px solid var(--paper-ink);
  border-radius: 999px;
  background: transparent;
  color: var(--paper-ink);
  font-family: var(--font-mono);
  font-size: var(--text-small);
  transition: background var(--duration-fast), color var(--duration-fast);
}

.letter__close:hover,
.letter__close:focus-visible {
  background: var(--paper-ink);
  color: var(--paper);
}

@keyframes letter-in {
  from {
    opacity: 0;
    transform: translateY(40px) rotate(-2deg);
  }
}