/* ===== Modern CSS Variables ===== */
:root {
  /* Modern Color Palette */
  --primary: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --secondary: #10b981;
  --accent: #f59e0b;
  --accent2: #8b5cf6;
  --danger: #ef4444;
  --success: #10b981;

  /* Dark/Light Theme Variables */
  --bg: #0f172a;
  --bg-alt: #1e293b;
  --bg-sheet: #1e293b;
  --bg-card: #1e293b;
  --text: #f1f5f9;
  --text-light: #94a3b8;
  --text-lighter: #64748b;
  --border: #334155;
  --border-light: #475569;
  --border-dark: #1e293b;
  
  /* Shadow System */
  --shadow: 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-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.3);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--accent2) 100%);
  --gradient-accent: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
  --gradient-dark: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  
  /* Spacing System */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-index layers */
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-fixed: 30;
  --z-modal: 40;
  --z-popover: 50;
  --z-tooltip: 60;
}



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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ===== Typography Scale ===== */
h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 0%, var(--text-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1.3;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
}

p {
  margin-bottom: var(--space-md);
  font-size: 1.125rem;
  color: var(--text-light);
}

.small {
  font-size: 0.875rem;
  color: var(--text-lighter);
  line-height: 1.5;
}

b, strong {
  font-weight: 600;
  color: var(--text);
}

/* ===== Container System ===== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

.glass {
  background: rgba(30, 41, 59, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ===== Button System ===== */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
  font-family: var(--font-sans);
  gap: 10px;
  position: relative;
  overflow: hidden;
}

.button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: var(--transition-slow);
}

.button:hover::before {
  left: 100%;
}

.button.primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

.button.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(59, 130, 246, 0.4);
}

.button:not(.primary) {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  border: 2px solid var(--border);
}

.button:not(.primary):hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-alt);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--accent2) 100%);
}

/* Selection */
::selection {
  background: rgba(59, 130, 246, 0.3);
  color: var(--text);
}

/* Focus Styles */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ===== Loading States ===== */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--primary);
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}