/* Apple Style Design System */
:root {
  /* Apple Color Palette */
  --apple-blue: #007AFF;
  --apple-gray: #8E8E93;
  --apple-light-gray: #F2F2F7;
  --apple-dark: #1D1D1F;
  --apple-white: #FFFFFF;
  --apple-green: #34C759;
  --apple-orange: #FF9500;
  --apple-red: #FF3B30;
  --apple-purple: #AF52DE;
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
  
  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
  --spacing-3xl: 96px;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-2xl: 30px;
  
  /* Transitions */
  --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-primary);
  font-size: 17px;
  line-height: 1.47059;
  font-weight: var(--font-weight-regular);
  letter-spacing: -0.022em;
  color: var(--apple-dark);
  background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Apple-style Navigation */
.navbar-apple {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition-smooth);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.navbar-apple.scrolled {
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 24px;
  font-weight: var(--font-weight-semibold);
  color: var(--apple-dark);
  text-decoration: none;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-logo:hover {
  color: var(--apple-blue);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
  align-items: center;
}

.nav-link {
  color: var(--apple-dark);
  text-decoration: none;
  font-size: 14px;
  font-weight: var(--font-weight-regular);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  letter-spacing: -0.01em;
}

.nav-link:hover {
  background: rgba(0, 122, 255, 0.1);
  color: var(--apple-blue);
}

/* Hero Section */
.hero-section {
  padding: var(--spacing-3xl) var(--spacing-md);
  text-align: center;
  background: url('../img/brina-blum-dnuhi4ssuve-unsplash16507168042.jpg');
  background-size: cover;
  color: var(--apple-white);
  position: relative;
  overflow: hidden;
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="white" stroke-width="0.5" opacity="0.1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)" /></svg>');
  opacity: 0.3;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: clamp(40px, 6vw, 72px);
  text-shadow: 3px 4px 5px black;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.015em;
  line-height: 1.0834933333;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    text-shadow: 3px 4px 5px black;
  font-size: clamp(21px, 3vw, 28px);
  font-weight: var(--font-weight-regular);
  letter-spacing: 0.007em;
  line-height: 1.381;
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-cta {
  display: inline-flex;
  gap: var(--spacing-sm);
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* Apple-style Buttons */
.btn-apple {
  padding: 12px 24px;
  font-size: 14px;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-2xl);
  border: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: var(--transition-fast);
  letter-spacing: -0.01em;
  position: relative;
  overflow: hidden;
}

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

.btn-primary:hover {
  background: #f0f0f0;
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: var(--apple-white);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

/* Feature Cards */
.features-section {
  padding: var(--spacing-3xl) var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.015em;
  margin-bottom: var(--spacing-sm);
  color: var(--apple-dark);
}

.section-subtitle {
  font-size: clamp(17px, 2.5vw, 21px);
  color: var(--apple-gray);
  font-weight: var(--font-weight-regular);
  letter-spacing: 0.011em;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.feature-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  transition: var(--transition-smooth);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--apple-blue), var(--apple-purple));
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon-container {
  width: 120px;
  height: 120px;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.feature-card:hover .feature-icon-container {
  transform: scale(1.05);
}

.feature-title {
  font-size: 24px;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-xs);
  color: var(--apple-dark);
  letter-spacing: -0.01em;
}

.feature-description {
  font-size: 16px;
  color: var(--apple-gray);
  line-height: 1.6;
  letter-spacing: -0.01em;
}

/* Stats Section */
.stats-section {
  background: var(--apple-dark);
  color: var(--apple-white);
  padding: var(--spacing-2xl) var(--spacing-md);
  position: relative;
  overflow: hidden;
}

.stats-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 122, 255, 0.2) 0%, transparent 70%);
  border-radius: 50%;
}

.stats-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  position: relative;
  z-index: 1;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 56px;
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, #007AFF 0%, #AF52DE 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 17px;
  color: var(--apple-gray);
  font-weight: var(--font-weight-regular);
}

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

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

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

/* Responsive */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .hero-section {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Scroll Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* System Architecture Section */
.architecture-section {
  padding: var(--spacing-3xl) var(--spacing-md);
  background: var(--apple-white);
  position: relative;
}

.architecture-diagram {
  max-width: 1200px;
  margin: var(--spacing-2xl) auto;
  padding: var(--spacing-xl);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  text-align: center;
}

/* Footer */
.footer-apple {
  background: var(--apple-dark);
  color: var(--apple-gray);
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-link {
  color: var(--apple-gray);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition-fast);
}

.footer-link:hover {
  color: var(--apple-white);
}

.footer-copyright {
  font-size: 12px;
  color: #6E6E73;
}