/* ==========================================================================
   Motion — scroll reveal, nav underline, hero scroll cue
   prefers-reduced-motion は base.css 側で全体的に無効化される
   ========================================================================== */

/* --- Scroll reveal (JSでis-visibleを付与) --- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
  transition-delay: var(--reveal-delay, 0ms);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* JS未実行時(またはJS無効時)でもコンテンツが見えるようにフォールバック */
.no-js [data-reveal] {
  opacity: 1;
  transform: none;
}

/* --- Nav link underline --- */
.nav__links a {
  position: relative;
  padding-bottom: 4px;
}

.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: currentColor;
  transition: right var(--transition-base);
}

.nav__links a:hover::after {
  right: 0;
}

/* --- Hero scroll cue --- */
.hero__scroll-cue {
  position: absolute;
  left: 50%;
  bottom: var(--space-lg);
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xs);
  color: rgba(255, 255, 255, 0.65);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  animation: hero-cue-bounce 2.2s ease-in-out infinite;
}

@keyframes hero-cue-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* --- Card / reason-card / accordion micro-interactions --- */
.card,
.reason-card {
  transition: box-shadow var(--transition-slow), transform var(--transition-slow), border-color var(--transition-base);
}

.card:hover {
  border-color: var(--color-accent-soft);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.reason-card:hover {
  border-color: var(--color-accent-soft);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.accordion-item__trigger {
  transition: color var(--transition-fast);
}

.accordion-item__trigger:hover {
  color: var(--color-accent);
}

.accordion-item__trigger:hover .accordion-item__icon {
  color: var(--color-accent);
}

/* --- Button underline sheen on primary CTA --- */
.btn--primary {
  position: relative;
  overflow: hidden;
}

.btn--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transform: translateX(-120%);
  transition: transform var(--transition-slow);
}

.btn--primary:hover::before {
  transform: translateX(120%);
}

@media (prefers-reduced-motion: reduce) {
  .hero__scroll-cue {
    animation: none;
  }
}