/* ===== Aurelbloom custom styles ===== */

html {
  scroll-behavior: smooth;
}

::selection {
  background: #0E6E6E;
  color: #fff;
}

/* ---- Reveal (Intersection Observer) ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--d, 0ms);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Hero line stagger ---- */
.hero-line {
  opacity: 0;
  transform: translateY(28px);
  animation: heroUp 1.1s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}
.hero-line:nth-of-type(1) { animation-delay: 0.15s; }
h1 .hero-line:nth-child(1) { animation-delay: 0.35s; }
h1 .hero-line:nth-child(2) { animation-delay: 0.55s; }
section#top p.hero-line { animation-delay: 0.8s; }
section#top div.hero-line { animation-delay: 1s; }

@keyframes heroUp {
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Scroll indicator ---- */
.scroll-bar {
  transform-origin: top;
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%   { transform: scaleY(0); transform-origin: top; }
  45%  { transform: scaleY(1); transform-origin: top; }
  55%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---- Button fill micro-interaction ---- */
.btn-fill {
  position: relative;
  overflow: hidden;
  z-index: 0;
  transition: color 0.45s cubic-bezier(0.22, 1, 0.36, 1),
              border-color 0.45s;
}
.btn-fill::before {
  content: "";
  position: absolute;
  inset: 0;
  background: #0E6E6E;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
  z-index: -1;
}
.btn-fill:hover {
  color: #fff;
  border-color: #0E6E6E;
}
.btn-fill:hover::before {
  transform: scaleX(1);
}

/* light variant for dark section */
.btn-fill-light {
  position: relative;
  overflow: hidden;
  z-index: 0;
  transition: color 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}
.btn-fill-light::before {
  content: "";
  position: absolute;
  inset: 0;
  background: #fff;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
  z-index: -1;
}
.btn-fill-light:hover {
  color: #1A1A1A;
}
.btn-fill-light:hover::before {
  transform: scaleX(1);
}

/* ---- Nav link underline ---- */
.nav-link {
  position: relative;
  padding-bottom: 4px;
  transition: color 0.3s;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: #0E6E6E;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.nav-link:hover {
  color: #0E6E6E;
}
.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ---- Nav scrolled state ---- */
#nav.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid #e5e5e5;
}

/* ---- Product image placeholder (画像未設置時) ---- */
.product-placeholder {
  position: relative;
}
.product-placeholder::after {
  content: "NIC HYPER";
  font-family: "Playfair Display", serif;
  font-size: 1.5rem;
  letter-spacing: 0.2em;
  color: #c8c8c8;
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  .reveal, .hero-line {
    opacity: 1;
    transform: none;
    animation: none;
    transition: none;
  }
  .scroll-bar { animation: none; }
  html { scroll-behavior: auto; }
}