/* ============================================
   On Site Chiropractic Care — Custom Styles
   ============================================ */

/* --- Base & Typography --- */
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
}

::selection {
  background-color: rgba(22, 101, 52, 0.15);
  color: #052e16;
}

/* --- Navigation --- */
.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: #4ade80;
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* Header scroll state */
#site-header.scrolled {
  background-color: rgba(253, 252, 248, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(22, 101, 52, 0.08);
}

#site-header.scrolled .nav-link {
  color: #166534;
}

#site-header.scrolled .font-serif {
  color: #14532d;
}

/* --- Mobile Menu --- */
#mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

.mobile-link {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease, color 0.3s ease;
}

#mobile-menu.open .mobile-link {
  opacity: 1;
  transform: translateY(0);
}

#mobile-menu.open .mobile-link:nth-child(1) { transition-delay: 0.05s; }
#mobile-menu.open .mobile-link:nth-child(2) { transition-delay: 0.1s; }
#mobile-menu.open .mobile-link:nth-child(3) { transition-delay: 0.15s; }
#mobile-menu.open .mobile-link:nth-child(4) { transition-delay: 0.2s; }
#mobile-menu.open .mobile-link:nth-child(5) { transition-delay: 0.25s; }

/* --- Service Cards --- */
.service-card {
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.5s ease, border-color 0.5s ease;
}

.service-card:hover {
  transform: translateY(-4px);
}

/* --- FAQ --- */
.faq-item {
  transition: border-color 0.3s ease;
}

.faq-item.active {
  border-color: rgba(74, 222, 128, 0.3);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1), padding 0.4s ease;
}

.faq-item.active .faq-content {
  max-height: 200px;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

/* --- Scroll Reveal (progressive enhancement) --- */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1), transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
  }

  .reveal.revealed {
    opacity: 1;
    transform: translateY(0);
  }

  .reveal-delay-1 { transition-delay: 0.1s; }
  .reveal-delay-2 { transition-delay: 0.2s; }
  .reveal-delay-3 { transition-delay: 0.3s; }
  .reveal-delay-4 { transition-delay: 0.4s; }
  .reveal-delay-5 { transition-delay: 0.5s; }
}

/* --- Floating card animation --- */
@media (prefers-reduced-motion: no-preference) {
  @keyframes float-slow {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
  }

  @keyframes float-medium {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-6px); }
  }

  .float-slow {
    animation: float-slow 6s ease-in-out infinite;
  }

  .float-medium {
    animation: float-medium 5s ease-in-out infinite;
    animation-delay: 1s;
  }

  .float-fast {
    animation: float-slow 4s ease-in-out infinite;
    animation-delay: 2s;
  }
}

/* --- Form --- */
input:focus,
textarea:focus {
  border-color: #86efac;
  box-shadow: 0 0 0 3px rgba(134, 239, 172, 0.15);
}

/* --- Image lazy load fallback --- */
img[loading="lazy"] {
  transition: opacity 0.5s ease;
}

/* --- Responsive adjustments --- */
@media (max-width: 767px) {
  .font-serif {
    line-height: 1.15;
  }
}