/* ===== 動畫 ===== */

@keyframes scroll-line {
  0% { top: -100%; }
  60% { top: 100%; }
  100% { top: 100%; }
}

@keyframes music-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes env-float-in {
  from {
    opacity: 0;
    transform: translateY(46px) scale(0.94);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes scroll-bob {
  0%, 100% {
    transform: translateY(0);
    opacity: 0.85;
  }
  50% {
    transform: translateY(6px);
    opacity: 1;
  }
}

@keyframes hint-bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

@keyframes rsvp-glow {
  0%, 100% { box-shadow: 0 8px 24px rgba(164, 124, 108, 0.45); }
  50% { box-shadow: 0 8px 24px rgba(164, 124, 108, 0.45), 0 0 0 10px rgba(164, 124, 108, 0.12); }
}

@keyframes hero-fade-up {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 首屏進場 */
.hero-tagline,
.hero-names,
.hero-parents,
.hero-date,
.hero-weekday {
  animation: hero-fade-up 1.1s var(--ease-soft) both;
}

.hero-names { animation-delay: 0.25s; }
.hero-parents { animation-delay: 0.45s; }
.hero-date { animation-delay: 0.65s; }
.hero-weekday { animation-delay: 0.8s; }

/* 捲動顯示動畫（IntersectionObserver 加上 .is-inview） */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity var(--dur-reveal) var(--ease-soft),
              transform var(--dur-reveal) var(--ease-soft);
}

.reveal.is-inview {
  opacity: 1;
  transform: translateY(0);
}

/* 交錯延遲 */
.reveal[data-delay="1"] { transition-delay: 0.12s; }
.reveal[data-delay="2"] { transition-delay: 0.24s; }
.reveal[data-delay="3"] { transition-delay: 0.36s; }
.reveal[data-delay="4"] { transition-delay: 0.48s; }
.reveal[data-delay="5"] { transition-delay: 0.6s; }

/* ===== 減少動畫模式 ===== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}