/* ── Base & Utilities ── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

/* ── Floating animations ── */
@keyframes float-slow {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}
@keyframes float-medium {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-7px); }
}
@keyframes float-fast {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-5px); }
}

.animate-float-slow    { animation: float-slow 5s ease-in-out infinite; }
.animate-float-medium  { animation: float-medium 4s ease-in-out infinite 0.5s; }
.animate-float-fast    { animation: float-fast 3s ease-in-out infinite 1s; }

/* ── Scroll reveal (progressive enhancement) ── */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s 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; }
}

/* Fallback: always visible if JS is off or prefers-reduced-motion */
.js-enabled .reveal {
  /* JS will add .revealed class */
}
:not(.js-enabled) .reveal,
@media (prefers-reduced-motion: reduce) .reveal {
  opacity: 1;
  transform: none;
  transition: none;
}

/* ── Mobile menu transitions ── */
#mobile-menu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease;
  opacity: 0;
}
#mobile-menu.open {
  max-height: 400px;
  opacity: 1;
}

/* ── Nav scroll state ── */
#site-header.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(147, 51, 234, 0.08), 0 4px 20px rgba(147, 51, 234, 0.06);
}

/* ── Mobile menu button animation ── */
#menu-btn[aria-expanded="true"] #bar1 {
  transform: translateY(4px) rotate(45deg);
}
#menu-btn[aria-expanded="true"] #bar2 {
  opacity: 0;
  transform: scaleX(0);
}
#menu-btn[aria-expanded="true"] #bar3 {
  transform: translateY(-4px) rotate(-45deg);
}

/* ── Back to top ── */
#back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ── Selection color ── */
::selection {
  background: rgba(147, 51, 234, 0.2);
  color: #3b0764;
}

/* ── Smooth focus outlines ── */
:focus-visible {
  outline: 2px solid #9333ea;
  outline-offset: 2px;
  border-radius: 4px;
}

/* ── Custom scrollbar ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #faf5ff; }
::-webkit-scrollbar-thumb { background: #d8b4fe; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #c084fc; }