:root {
  /* Color System */
  --primary: #6C63FF;
  --primary-light: #8B85FF;
  --primary-dark: #4A42D4;
  --secondary: #FF6584;
  --accent: #00C9A7;
  --text: #2D3748;
  --text-light: #718096;
  --background: #F7FAFC;
  --surface: #FFFFFF;
  --error: #E53E3E;
  --success: #38A169;
  --warning: #DD6B20;
  --info: #3182CE;
  
  /* Spacing System */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-8: 4rem;
  
  /* Typography */
  --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: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Z-index */
  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-50: 50;
}

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

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

body {
  font-family: 'Lexend', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--background);
  padding: 0;
  margin: 0;
  transition: var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Header */
.pw-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background-color: var(--surface);
  z-index: var(--z-50);
  display: flex;
  align-items: center;
  padding: 0 var(--space-4);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* Logo */
.logo-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.center-logo {
  height: 50px;
  transition: var(--transition-normal);
  will-change: transform;
}

/* Main Content */
main {
  padding-top: 100px;
  min-height: calc(100vh - 100px);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text);
  margin-bottom: var(--space-4);
  line-height: 1.2;
  font-weight: 700;
}

h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--font-size-3xl);
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

p {
  margin-bottom: var(--space-4);
  color: var(--text-light);
}

/* Links */
a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition-fast);
  border-bottom: 2px solid transparent;
  position: relative;
}

a:hover, a:focus {
  color: var(--primary-dark);
  border-bottom-color: var(--primary);
}

/* Buttons */
button {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  will-change: transform;
}

button:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
}

/* Cards */
.card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-4) 0;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  will-change: transform;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* Accessibility Features */
.accessibility-button {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 60px;
  height: 60px;
  background-color: var(--primary);
  border: none;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
  z-index: var(--z-50);
  will-change: transform;
}

.accessibility-button:hover {
  transform: scale(1.1);
  background-color: var(--primary-dark);
}

.accessibility-panel {
  position: fixed;
  bottom: -100%;
  left: 0;
  right: 0;
  background-color: var(--surface);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition: var(--transition-normal);
  z-index: var(--z-40);
}

.accessibility-panel.show {
  bottom: 0;
}

/* High Contrast Mode */
.high-contrast {
  --primary: #FFFF00;
  --text: #FFFFFF;
  --background: #000000;
  --surface: #1A1A1A;
  --text-light: #CCCCCC;
}

/* Easy Read Mode */
.easy-read {
  --primary: #0000FF;
  --text: #000000;
  --background: #FFFFF0;
  --surface: #FFFFFF;
  --text-light: #333333;
}

/* Dyslexia Friendly Mode */
.dyslexia-friendly {
  font-family: 'OpenDyslexic', sans-serif;
  letter-spacing: 0.35px;
  word-spacing: 1.6px;
  line-height: 2;
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }
  
  .container {
    padding: 0 var(--space-3);
  }
  
  .section {
    padding: var(--space-4) 0;
  }
  
  .card {
    padding: var(--space-4);
  }
}

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

.fade-in {
  animation: fadeIn var(--transition-normal) forwards;
}

/* Image Optimization */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

.lazy-load {
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.lazy-load.loaded {
  opacity: 1;
}

/* Print Styles */
@media print {
  .accessibility-button,
  .accessibility-panel {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  a {
    text-decoration: underline;
  }
}

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

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --text: #E2E8F0;
    --text-light: #A0AEC0;
    --background: #1A202C;
    --surface: #2D3748;
  }
}