/* 🚀 Critical CSS for Above-the-Fold Content */

/* Reset dan base styles untuk immediate render */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: #1a202c;
  background-color: #ffffff;
}

/* Header navigation - critical for first paint */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e2e8f0;
  height: 70px;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #2563eb;
  text-decoration: none;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: #4a5568;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: #2563eb;
}

/* Hero section - above the fold content */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  text-align: center;
  z-index: 2;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.25rem);
  margin-bottom: 2rem;
  opacity: 0.9;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-button {
  display: inline-block;
  background-color: #ffffff;
  color: #2563eb;
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

/* Mobile responsive - critical for mobile-first indexing */
@media (max-width: 768px) {
  .nav-menu {
    display: none; /* Hidden by default, shown via JS */
  }
  
  .hero {
    padding: 2rem 0;
    min-height: 80vh;
  }
  
  .hero-content {
    padding: 0 1rem;
  }
  
  .hero-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
  }
  
  .cta-button {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
  }
}

/* Loading states untuk improved perceived performance */
.loading-skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, transparent 37%, #f0f0f0 63%);
  background-size: 400% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
  0% {
    background-position: 100% 0;
  }
  100% {
    background-position: -100% 0;
  }
}

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

img[data-src] {
  filter: blur(5px);
  transition: filter 0.3s ease;
}

img.loaded {
  filter: blur(0);
}

/* Font display optimization */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap; /* Critical for preventing font blocking */
  src: url('https://fonts.gstatic.com/s/inter/v12/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hiA.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('https://fonts.gstatic.com/s/inter/v12/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuGKYAZ9hiA.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('https://fonts.gstatic.com/s/inter/v12/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuFuYAZ9hiA.woff2') format('woff2');
}

/* Preload critical images */
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('/assets/images/hero-bg.webp');
  background-size: cover;
  background-position: center;
  opacity: 0.1;
  z-index: 1;
}

/* Accessibility improvements */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus states untuk keyboard navigation */
a:focus,
button:focus {
  outline: 2px solid #2563eb;
  outline-offset: 2px;
}

/* Reduced motion untuk accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Print styles */
@media print {
  .header,
  .cta-button {
    display: none;
  }
  
  .hero {
    background: none;
    color: black;
    min-height: auto;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .hero {
    background: #000000;
    color: #ffffff;
  }
  
  .nav-link {
    color: #000000;
  }
  
  .nav-link:hover {
    color: #0000ff;
  }
}