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

/* Reading Progress Bar */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  z-index: 9999;
}

#progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #f97316);
  transition: width 0.1s ease;
}

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

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

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

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
}

.animate-delay-1 {
  animation-delay: 0.1s;
}

.animate-delay-2 {
  animation-delay: 0.2s;
}

.animate-delay-3 {
  animation-delay: 0.3s;
}

.animate-delay-4 {
  animation-delay: 0.4s;
}

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

.section-card {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.section-card.visible {
  opacity: 1;
  transform: translateY(0);
}

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

/* Scroll to Top Button */
#scrollTopBtn {
  transition: opacity 0.3s, transform 0.3s;
}

#scrollTopBtn.show {
  opacity: 1;
  pointer-events: all;
}