/* ========== BASE ========== */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  overflow-x: hidden;
}

::selection {
  background-color: #3490fc;
  color: white;
}

/* ========== NAVBAR ========== */
#navbar {
  background: transparent;
}

#navbar.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.nav-link {
  color: rgba(255, 255, 255, 0.8);
}

.nav-link:hover {
  color: white;
}

.nav-logo-text {
  color: white;
}

.nav-logo-sub {
  color: rgba(255, 255, 255, 0.5);
}

#navbar.scrolled .nav-link {
  color: #4b5563;
}

#navbar.scrolled .nav-link:hover {
  color: #3490fc;
}

#navbar.scrolled .nav-logo-text {
  color: #111827;
}

#navbar.scrolled .nav-logo-sub {
  color: #9ca3af;
}

#navbar.scrolled #mobile-menu-btn {
  color: #374151;
}

#mobile-menu-btn {
  color: white;
}

/* ========== HERO GRID ========== */
.hero-grid {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ========== ANIMATIONS ========== */
@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

.animate-float {
  animation: float 4s ease-in-out infinite;
}

/* ========== SMOOTH TRANSITIONS ========== */
a, button {
  transition: all 0.2s ease;
}

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 640px) {
  .hero-grid {
    background-size: 40px 40px;
  }
}

/* ========== FORM FOCUS STATES ========== */
input:focus,
select:focus,
textarea:focus {
  border-color: #3490fc;
  box-shadow: 0 0 0 3px rgba(52, 144, 252, 0.15);
}

/* ========== LOADING ANIMATION ========== */
.page-loader {
  position: fixed;
  inset: 0;
  background: #142856;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s, visibility 0.5s;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: #3490fc;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}