/* ========================================
   IIU PREMIUM DESIGN SYSTEM
   World-Class Website Design
   Inspired by: Apple, BMW, Hermès
   ======================================== */

/* ========================================
   1. RESET & BASE
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Premium Colors */
  --primary-orange: #FF8800;
  --primary-dark: #1a1a1a;
  --primary-light: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Typography */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Spacing (Golden Ratio based) */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.618rem;
  --space-lg: 2.618rem;
  --space-xl: 4.236rem;
  --space-2xl: 6.854rem;
  --space-3xl: 11.09rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 700ms cubic-bezier(0.16, 1, 0.3, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--gray-900);
  background: var(--primary-light);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ========================================
   2. TYPOGRAPHY
   ======================================== */
.display-1 {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-family: var(--font-display);
}

.display-2 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-family: var(--font-display);
}

.heading-1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.heading-2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1.3;
}

.heading-3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1.4;
}

.body-large {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  line-height: 1.7;
  color: var(--gray-700);
}

.body-base {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--gray-600);
}

/* ========================================
   3. PREMIUM HERO SECTION
   ======================================== */
.premium-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
}

.premium-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(255, 136, 0, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 136, 0, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.premium-hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
}

.premium-hero h1 {
  color: var(--primary-light);
  margin-bottom: var(--space-lg);
  animation: fadeInUp 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.premium-hero p {
  color: var(--gray-300);
  max-width: 700px;
  margin: 0 auto var(--space-xl);
  animation: fadeInUp 1s cubic-bezier(0.16, 1, 0.3, 1) 0.2s both;
}

.premium-hero-illustration {
  position: absolute;
  right: 10%;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0.15;
  max-width: 500px;
  animation: float 6s ease-in-out infinite;
}

/* ========================================
   4. GLASSMORPHISM CARDS
   ======================================== */
.glass-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 24px;
  padding: var(--space-xl);
  transition: all var(--transition-smooth);
}

.glass-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 136, 0, 0.3);
  transform: translateY(-8px);
  box-shadow: 
    0 20px 40px rgba(0, 0, 0, 0.2),
    0 0 80px rgba(255, 136, 0, 0.1);
}

/* ========================================
   5. PREMIUM BUTTONS
   ======================================== */
.btn-premium {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 1rem 2.5rem;
  font-size: 1.125rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 50px;
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
  border: none;
  cursor: pointer;
}

.btn-premium-primary {
  background: linear-gradient(135deg, var(--primary-orange) 0%, #ff6600 100%);
  color: white;
  box-shadow: 0 10px 30px rgba(255, 136, 0, 0.3);
}

.btn-premium-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left var(--transition-smooth);
}

.btn-premium-primary:hover::before {
  left: 100%;
}

.btn-premium-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 15px 40px rgba(255, 136, 0, 0.4);
}

.btn-premium-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--primary-light);
  border: 2px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

.btn-premium-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--primary-orange);
  transform: translateY(-2px);
}

/* ========================================
   6. SCROLL ANIMATIONS
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all var(--transition-smooth);
}

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

/* ========================================
   7. PREMIUM SECTIONS
   ======================================== */
.premium-section {
  padding: var(--space-3xl) var(--space-lg);
  position: relative;
}

.premium-section-dark {
  background: linear-gradient(180deg, #1a1a1a 0%, #0a0a0a 100%);
  color: var(--primary-light);
}

.premium-section-light {
  background: var(--gray-50);
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--space-2xl);
}

.section-label {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: linear-gradient(135deg, rgba(255, 136, 0, 0.1) 0%, rgba(255, 136, 0, 0.05) 100%);
  border: 1px solid rgba(255, 136, 0, 0.2);
  border-radius: 50px;
  color: var(--primary-orange);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

/* ========================================
   8. GRID LAYOUTS
   ======================================== */
.premium-grid {
  display: grid;
  gap: var(--space-xl);
  max-width: 1400px;
  margin: 0 auto;
}

.premium-grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
}

.premium-grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

/* ========================================
   9. HOVER EFFECTS & MICRO-INTERACTIONS
   ======================================== */
.hover-lift {
  transition: transform var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-8px);
}

.hover-glow {
  transition: all var(--transition-base);
}

.hover-glow:hover {
  box-shadow: 0 0 40px rgba(255, 136, 0, 0.3);
}

/* ========================================
   10. ANIMATED COUNTER
   ======================================== */
.stat-number {
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-orange) 0%, #ff6600 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-label {
  font-size: 1.125rem;
  color: var(--gray-600);
  margin-top: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ========================================
   11. RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
  .premium-hero {
    min-height: 80vh;
  }
  
  .premium-hero-illustration {
    display: none;
  }
  
  .premium-grid-2,
  .premium-grid-3 {
    grid-template-columns: 1fr;
  }
  
  .premium-section {
    padding: var(--space-2xl) var(--space-md);
  }
}

/* ========================================
   12. PARALLAX EFFECT
   ======================================== */
.parallax-wrapper {
  position: relative;
  overflow: hidden;
}

.parallax-bg {
  position: absolute;
  top: -20%;
  left: 0;
  width: 100%;
  height: 140%;
  background-size: cover;
  background-position: center;
  will-change: transform;
}

/* ========================================
   13. GRADIENT TEXT
   ======================================== */
.gradient-text {
  background: linear-gradient(135deg, var(--primary-orange) 0%, #ff6600 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========================================
   14. PREMIUM FOOTER
   ======================================== */
.premium-footer {
  background: #0a0a0a;
  color: var(--gray-400);
  padding: var(--space-2xl) var(--space-lg) var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ========================================
   15. LOADING ANIMATION
   ======================================== */
@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

.shimmer {
  animation: shimmer 2s infinite;
  background: linear-gradient(
    to right,
    transparent 0%,
    rgba(255, 136, 0, 0.1) 50%,
    transparent 100%
  );
  background-size: 1000px 100%;
}