/* ─── Base ─── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ─── Header ─── */
#site-header {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}
#site-header.scrolled {
  border-bottom-color: #f1f5f9;
  box-shadow: 0 1px 0 rgba(0,0,0,0.04);
}

/* ─── Nav links ─── */
.nav-link {
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: #0d9488;
  transition: width 0.25s;
}
.nav-link:hover::after { width: 100%; }

.mobile-nav-link {
  position: relative;
  padding-left: 0;
  border-left: 2px solid transparent;
  transition: border-color 0.2s, padding-left 0.2s;
}
.mobile-nav-link:hover {
  border-left-color: #0d9488;
  padding-left: 0.75rem;
}

/* ─── Amenity cards ─── */
.amenity-card {
  transition: transform 0.25s;
}
.amenity-card:hover {
  transform: translateY(-2px);
}

/* ─── Fade-in on scroll ─── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.16,1,0.3,1), transform 0.7s cubic-bezier(0.16,1,0.3,1);
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Stagger children ─── */
.stagger > * { transition-delay: calc(var(--i, 0) * 0.08s); }

/* ─── Mobile menu animation ─── */
#mobile-menu {
  animation: slideDown 0.25s ease-out;
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}