:root {
  /* Colors - Dark theme */
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #111111;
  --color-bg-tertiary: #1a1a1a;
  --color-bg-card: rgba(255, 255, 255, 0.02);
  --color-bg-card-hover: rgba(255, 255, 255, 0.05);
  
  --color-text-primary: #fafafa;
  --color-text-secondary: #a1a1a1;
  --color-text-tertiary: #6e6e6e;
  
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.16);
  
  --color-accent: #5e6ad2;
  --color-accent-hover: #7c8adb;
  --color-accent-gradient: linear-gradient(135deg, #5e6ad2 0%, #7c8adb 100%);
  
  --color-gradient-primary: linear-gradient(180deg, #5e6ad2 0%, #2f3676 100%);
  --color-gradient-secondary: linear-gradient(135deg, rgba(94, 106, 210, 0.2) 0%, rgba(124, 138, 219, 0.2) 100%);
  --color-gradient-mesh: radial-gradient(at 50% 50%, rgba(94, 106, 210, 0.4) 0%, transparent 50%),
                        radial-gradient(at 80% 0%, rgba(124, 138, 219, 0.3) 0%, transparent 50%),
                        radial-gradient(at 0% 100%, rgba(94, 106, 210, 0.3) 0%, transparent 50%);
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", "Roboto", sans-serif;
  --font-mono: "SF Mono", "Monaco", "Inconsolata", "Fira Code", monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 4rem;
  
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.1;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.5), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(94, 106, 210, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-slower: 500ms ease;
  
  /* Z-index */
  --z-negative: -1;
  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-50: 50;
  --z-60: 60;
  --z-70: 70;
  --z-80: 80;
  --z-90: 90;
  --z-100: 100;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(var(--font-size-4xl), 8vw, var(--font-size-6xl));
  font-weight: var(--font-weight-bold);
}

h2 {
  font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
}

h3 {
  font-size: clamp(var(--font-size-2xl), 3vw, var(--font-size-4xl));
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-accent);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-8);
  }
}

/* Navigation */
.nav-modern {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-100);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  background-color: rgba(10, 10, 10, 0.8);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.nav-modern.scrolled {
  background-color: rgba(10, 10, 10, 0.95);
}

.nav-modern .nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
}

.nav-modern .logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}

.nav-modern .nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav-modern .nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}

.nav-modern .nav-link:hover {
  color: var(--color-text-primary);
}

.nav-modern .nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.nav-modern .nav-link:hover::after,
.nav-modern .nav-link.active::after {
  width: 100%;
}

/* Nav item links */
.nav-modern .nav-item > a {
  position: relative;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  transition: color var(--transition-base);
}

.nav-modern .nav-item > a:hover,
.nav-modern .nav-item > a.active {
  color: var(--color-accent);
}

/* Dropdown Menu */
.nav-modern .dropdown {
  position: relative;
}

.nav-modern .dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-modern .dropdown-toggle svg {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-base);
}

.nav-modern .dropdown:hover .dropdown-toggle svg {
  transform: rotate(180deg);
}

.nav-modern .dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: var(--space-3);
  min-width: 200px;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  padding: var(--space-2);
  list-style: none;
}

.nav-modern .dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-modern .dropdown-menu li {
  list-style: none;
}

.nav-modern .dropdown-menu a {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.nav-modern .dropdown-menu a:hover {
  color: var(--color-accent);
  background: rgba(94, 106, 210, 0.1);
  transform: translateX(2px);
}

/* Mobile dropdown adjustments */
@media (max-width: 768px) {
  .nav-modern .dropdown-menu {
    position: static;
    transform: none;
    width: 100%;
    margin-top: 0;
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    display: none;
  }
  
  .nav-modern .dropdown.active .dropdown-menu {
    display: block;
  }
  
  .nav-modern .dropdown-menu a {
    padding-left: var(--space-8);
  }
  
  .nav-modern .dropdown-toggle {
    width: 100%;
    justify-content: space-between;
  }
}

/* Hero Section */
.hero-modern {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--space-24);
  padding-bottom: var(--space-16);
}

.hero-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-gradient-mesh);
  opacity: 0.5;
  z-index: var(--z-negative);
}

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

.hero-modern .hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: rgba(94, 106, 210, 0.1);
  border: 1px solid rgba(94, 106, 210, 0.2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  margin-bottom: var(--space-6);
}

.hero-modern h1 {
  margin-bottom: var(--space-6);
}

.hero-modern .hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-modern .hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-accent);
  color: white;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
}

.hero-modern .hero-cta:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

/* Cards */
.card-modern {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card-modern:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
}

.card-modern:hover::before {
  opacity: 1;
}

/* Buttons */
.btn-modern {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  outline: none;
}

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

.btn-modern.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-modern.btn-secondary {
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-modern.btn-secondary:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-hover);
}

.btn-modern.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
}

.btn-modern.btn-ghost:hover {
  background: var(--color-bg-card);
}

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

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.animate-fadeIn {
  animation: fadeIn var(--transition-slow) ease-out;
}

.animate-slideIn {
  animation: slideIn var(--transition-slow) ease-out;
}

.animate-scaleIn {
  animation: scaleIn var(--transition-slow) ease-out;
}

/* Utility Classes */
.text-gradient {
  background: var(--color-gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.blur-bg {
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.8);
}

.glow {
  box-shadow: var(--shadow-glow);
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-cols-1 {
  grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 768px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Section Padding */
.section {
  padding: var(--space-24) 0;
}

.section-large {
  padding: var(--space-32) 0;
}

/* Feature Cards */
.feature-card {
  text-align: center;
  padding: var(--space-8);
}

.feature-card .icon {
  width: 64px;
  height: 64px;
  margin: 0 auto;
  margin-bottom: var(--space-4);
  padding: var(--space-3);
  background: var(--color-gradient-secondary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-3);
}

.feature-card p {
  font-size: var(--font-size-sm);
}

/* Responsive Navigation */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  cursor: pointer;
  padding: var(--space-2);
}

@media (max-width: 767px) {
  .mobile-menu-toggle {
    display: block;
  }
  
  .nav-modern .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    flex-direction: column;
    padding: var(--space-6) var(--space-4);
    gap: var(--space-2);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border-top: 1px solid var(--color-border);
  }
  
  .nav-modern .nav-menu.active {
    display: flex;
  }
  
  .nav-modern .nav-item {
    width: 100%;
    text-align: center;
  }
  
  .nav-modern .nav-item > a {
    display: block;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    border-radius: var(--radius-md);
    transition: background var(--transition-base);
  }
  
  .nav-modern .nav-item > a:hover {
    background: rgba(255, 255, 255, 0.05);
  }
  
  .nav-modern .nav-cta {
    margin-top: var(--space-4);
    width: 100%;
    text-align: center;
    display: block;
    padding: var(--space-3) var(--space-4);
  }
}

/* Dark section classes for hero areas */
.dark-section {
  background: #0a0a0a;
  color: #fafafa;
}

.dark-section h1, 
.dark-section h2, 
.dark-section h3, 
.dark-section h4, 
.dark-section h5, 
.dark-section h6 {
  color: #fafafa;
}

.dark-section p {
  color: #a1a1a1;
}

.dark-section .nav-modern {
  background-color: rgba(10, 10, 10, 0.8);
}

.dark-section .nav-modern.scrolled {
  background-color: rgba(10, 10, 10, 0.95);
}

.dark-section .card-modern {
  background: rgba(255, 255, 255, 0.02);
  border-color: rgba(255, 255, 255, 0.08);
}

.dark-section .card-modern:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.16);
}

.dark-section .btn-secondary {
  background: rgba(255, 255, 255, 0.02);
  border-color: rgba(255, 255, 255, 0.08);
}

.dark-section .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.16);
}

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

.dark-gradient-section h1, 
.dark-gradient-section h2, 
.dark-gradient-section h3, 
.dark-gradient-section h4, 
.dark-gradient-section h5, 
.dark-gradient-section h6 {
  color: #fafafa;
}

.dark-gradient-section p {
  color: #a1a1a1;
}