/* Critical CSS - Above the fold styles only */
:root {
  --color-primary: #3b82f6;
  --color-secondary: #64748b;
  --color-text: #1e293b;
  --color-bg: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.6;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  font-feature-settings: 'kern' 1, 'liga' 1, 'calt' 1;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Critical layout styles */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Hero section critical styles */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  padding: 2rem 0;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1rem 0;
  color: #1e293b;
}

.hero p {
  font-size: 1.25rem;
  color: #64748b;
  margin: 0 0 2rem 0;
  max-width: 600px;
}

/* Button critical styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  border-radius: 0.5rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease-in-out;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background-color: #2563eb;
  transform: translateY(-1px);
}

/* Navigation critical styles */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(226, 232, 240, 0.5);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

/* Skip link for accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sr-only:focus {
  position: absolute;
  width: auto;
  height: auto;
  padding: 0.5rem 1rem;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
  background: var(--color-primary);
  color: white;
  border-radius: 0.25rem;
  top: 1rem;
  left: 1rem;
  z-index: 1001;
}

/* Focus management for accessibility */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Loading state for non-critical content */
.lazy-load {
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}

.lazy-load.loaded {
  opacity: 1;
}

/* Font loading optimization */
.font-loading {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.font-loaded {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Responsive utilities */
@media (max-width: 768px) {
  .hero {
    padding: 1rem 0;
    text-align: center;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .nav-container {
    padding: 0 1rem;
  }
}

/* Animation utilities */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { 
    transform: translateY(20px); 
    opacity: 0; 
  }
  to { 
    transform: translateY(0); 
    opacity: 1; 
  }
}

.animate-fade-in {
  animation: fadeIn 0.6s ease-out;
}

.animate-slide-up {
  animation: slideUp 0.6s ease-out;
}

/* Image optimization */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Optimized image component */
.optimized-image {
  display: block;
  width: 100%;
  height: auto;
}

.optimized-image img {
  transition: opacity 0.3s ease-in-out;
}

.optimized-image img[loading="lazy"] {
  opacity: 0;
}

.optimized-image img.loaded {
  opacity: 1;
}