/* ===== D-Day reveal: cards flip open one by one ===== */
.reveal-burst { text-align: center; padding: 20px 0 8px; }
.reveal-burst .burst-icon { font-size: 44px; margin-bottom: 12px; animation: burstPop .5s ease; }
@keyframes burstPop { 0% { transform: scale(0.4); opacity: 0; } 60% { transform: scale(1.15); opacity: 1; } 100% { transform: scale(1); } }
.reveal-burst h2 { font-family: var(--font-serif); font-size: 22px; margin-bottom: 6px; }
.reveal-burst p { font-size: 12.5px; color: var(--ink-muted); margin-bottom: 26px; }

.reveal-grid { display: flex; flex-direction: column; gap: 12px; }

.reveal-card { perspective: 900px; height: auto; }
.reveal-card-inner {
  position: relative; width: 100%; min-height: 90px;
  transform-style: preserve-3d; transition: transform 0.7s cubic-bezier(.2,.7,.3,1);
}
.reveal-card.flipped .reveal-card-inner { transform: rotateY(180deg); }

.reveal-card-face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border-radius: 8px; padding: 18px 20px; display: flex; align-items: center;
  box-sizing: border-box;
}
.reveal-card-back {
  background: linear-gradient(135deg, var(--accent-soft), #EFD9B4);
  border: 1px solid var(--line); justify-content: center; font-size: 22px; color: var(--accent);
}
.reveal-card-front {
  background: var(--panel); border: 1px solid var(--line); transform: rotateY(180deg);
  flex-direction: column; align-items: flex-start; gap: 4px; min-width: 0;
}
.reveal-card-front .letter-text { font-family: var(--font-serif); font-size: 14.5px; line-height: 1.7; color: var(--ink); width: 100%; overflow-wrap: break-word; word-break: break-word; }
.reveal-card-front .letter-meta { font-size: 10.5px; color: var(--ink-muted); }