body {
  font-family: "Inter", sans-serif;
  padding-top: 0;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.8s ease-out forwards;
  opacity: 0;
}

.animate-delay-1 {
  animation-delay: 0.2s;
}

.animate-delay-2 {
  animation-delay: 0.4s;
}

.animate-delay-3 {
  animation-delay: 0.6s;
}

.animate-delay-4 {
  animation-delay: 0.8s;
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

.hero-gradient {
  background: linear-gradient(135deg, #1e40af 0%, #3b82f6 50%, #60a5fa 100%);
}

/* Smooth scroll */
html {
  scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: #3b82f6;
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: #2563eb;
}

.section-card {
  transition: all 0.3s ease;
}

.section-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* Reading Progress Indicator */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background-color: white;
  z-index: 99999;
  pointer-events: none;
}

#progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #2563eb 0%, #f97316 50%, #3b82f6 100%);
  background-size: 200% 100%;
  transition: width 0.2s ease-out;
  animation: gradientShift 3s ease infinite;
  will-change: width;
}

@keyframes gradientShift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}