:root {
  /* Professional Brand Colors - Prestige Palette */
  --primary: #0f172a; /* Slate 900 - Deep & Authoritative */
  --primary-dark: #020617;
  --primary-light: #1e293b;
  --secondary: #2563eb; /* Royal Blue - Trust & Tech */
  --secondary-dark: #1d4ed8;
  --secondary-light: #3b82f6;
  --accent: #f59e0b; /* Amber - Highlighting */
  --accent-dark: #d97706;
  --accent-light: #fbbf24;
  
  /* Gradients */
  --primary-gradient: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
  --secondary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --accent-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  --dark-gradient: linear-gradient(135deg, #020617, #0f172a, #1e293b);
  --mesh-gradient: radial-gradient(at 40% 20%, hsla(28,100%,74%,1) 0px, transparent 50%),
                   radial-gradient(at 80% 0%, hsla(189,100%,56%,1) 0px, transparent 50%),
                   radial-gradient(at 0% 50%, hsla(355,100%,93%,1) 0px, transparent 50%);
  
  /* Glass & Blur Effects */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-bg-dark: rgba(0, 0, 0, 0.3);
  --glass-border: rgba(255, 255, 255, 0.18);
  --blur-sm: blur(4px);
  --blur-md: blur(8px);
  --blur-lg: blur(12px);
  --blur-xl: blur(20px);
  
  /* Shadows */
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.5);
  --shadow-neon: 0 0 30px rgba(102, 126, 234, 0.7);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  
  /* Font Sizes (Fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.25rem);
  --text-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 3rem);
  --text-5xl: clamp(3rem, 2rem + 5vw, 4rem);
  
  /* Spacing (Fluid) */
  --space-xs: clamp(0.5rem, 0.45rem + 0.25vw, 0.75rem);
  --space-sm: clamp(1rem, 0.9rem + 0.5vw, 1.5rem);
  --space-md: clamp(1.5rem, 1.35rem + 0.75vw, 2rem);
  --space-lg: clamp(2rem, 1.8rem + 1vw, 3rem);
  --space-xl: clamp(3rem, 2.5rem + 2.5vw, 4rem);
  --space-2xl: clamp(4rem, 3rem + 5vw, 6rem);
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;
  
  /* Component Defaults */
  --radius-container: var(--radius-xl);
  --radius-card: var(--radius-xl);
  --radius-button: var(--radius-lg);
  --radius-input: var(--radius-md);
  
  /* Z-Index */
  --z-base: 0;
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-overlay: 30;
  --z-modal: 40;
  --z-toast: 50;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  --transition-spring: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Container */
  --container-max: 1280px;
  --container-padding: clamp(1rem, 5vw, 2rem);
  
  /* Grid */
  --grid-cols: 12;
  --grid-gap: clamp(1rem, 2vw, 2rem);
  
  /* Light Theme Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --border-color: #e5e7eb;
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-primary: #0f0f17;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #252541;
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-tertiary: #9ca3af;
  --border-color: #374151;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
}

/* System Preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: #0f0f17;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #252541;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-color: #374151;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
  }
}

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

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(102, 126, 234, 0.5); }
  50% { box-shadow: 0 0 40px rgba(102, 126, 234, 0.8); }
}

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes blob-morph {
  0%, 100% { border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
  50% { border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%; }
}

/* Modern Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--text-primary);
  background: var(--bg-primary);
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Utility Classes */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--blur-md);
  -webkit-backdrop-filter: var(--blur-md);
  border: 1px solid var(--glass-border);
}

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

.animate-float {
  animation: float 6s ease-in-out infinite;
}

.animate-pulse-glow {
  animation: pulse-glow 2s ease-in-out infinite;
}

.animate-gradient {
  background-size: 200% 200%;
  animation: gradient-shift 15s ease infinite;
}

.animate-blob {
  animation: blob-morph 8s ease-in-out infinite;
}

/* Typography Classes */
.text-display {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
}

.text-balance {
  text-wrap: balance;
}

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

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

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

@media (min-width: 1024px) {
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Responsive Hide/Show */
.mobile-only { display: block; }
.desktop-only { display: none; }

@media (min-width: 768px) {
  .mobile-only { display: none; }
  .desktop-only { display: block; }
}