/* ── Base & Utilities ── */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  overflow-x: hidden;
}

/* ── Floating Decorations ── */
@keyframes floatSlow {
  0%, 100% { transform: translateY(0px) scale(1); }
  50% { transform: translateY(-18px) scale(1.05); }
}
@keyframes floatMedium {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
}
@keyframes floatFast {
  0%, 100% { transform: translateY(0px) translateX(0px); }
  50% { transform: translateY(-8px) translateX(6px); }
}
.float-slow { animation: floatSlow 6s ease-in-out infinite; }
.float-medium { animation: floatMedium 4s ease-in-out infinite; }
.float-fast { animation: floatFast 3s ease-in-out infinite; }

/* ── Scroll Reveal (progressive enhancement) ── */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
  }
  .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; }
  .reveal-delay-6 { transition-delay: 0.6s; }
}

/* ── Navbar scroll state ── */
#navbar.scrolled {
  box-shadow: 0 4px 20px rgba(10, 21, 36, 0.08);
}

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

/* ── Form focus ring ── */
input:focus, select:focus, textarea:focus {
  outline: none;
}

/* ── Selection ── */
::selection {
  background-color: #4fd1c5;
  color: #0a1524;
}