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

::selection { background: #7ED4B8; color: #0A1628; }

/* ── Header scroll state ── */
#header { background: transparent; }
#header.scrolled {
  background: rgba(253, 248, 244, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(10, 22, 40, 0.06);
}
.header-logo-text { color: #0A1628; }

/* ── Nav links ── */
.nav-link { position: relative; }
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: #7ED4B8;
  transition: width 0.3s ease;
}
.nav-link:hover::after { width: 100%; }

/* ── Mobile menu ── */
#mobile-menu.open { opacity: 1; pointer-events: all; }
#mobile-menu:not(.open) { opacity: 0; pointer-events: none; }
.mobile-nav-link { position: relative; }

/* ── Animations ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes floatSlow {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-18px) rotate(2deg); }
}
@keyframes floatMedium {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-12px) rotate(-1deg); }
}
@keyframes floatFast {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
@keyframes scrollLine {
  0% { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { opacity: 0; transform: scaleY(0); transform-origin: bottom; }
}

.animate-fade-up { animation: fadeUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards; }
.animate-float-slow { animation: floatSlow 7s ease-in-out infinite; }
.animate-float-medium { animation: floatMedium 5s ease-in-out infinite; }
.animate-float-fast { animation: floatFast 4s ease-in-out infinite; }
.animate-float-card { animation: floatCard 4s ease-in-out infinite; }
.animate-scroll-line { animation: scrollLine 2s ease-in-out infinite; }

/* ── Scroll reveal ── */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ── Custom select arrow ── */
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%230A1628' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* ── Focus visible ── */
:focus-visible { outline: 2px solid #7ED4B8; outline-offset: 2px; }

/* ── Responsive tweaks ── */
@media (max-width: 767px) {
  html { scroll-padding-top: 72px; }
}