/* Example of your CSS architecture output */
:root {
  /* Light Theme Colors - Use actual colors from project spec */
  --bg-primary: [spec-light-bg];
  --bg-secondary: [spec-light-secondary];
  --text-primary: [spec-light-text];
  --text-secondary: [spec-light-text-muted];
  --border-color: [spec-light-border];
  
  /* Brand Colors - From project specification */
  --primary-color: [spec-primary];
  --secondary-color: [spec-secondary];
  --accent-color: [spec-accent];
  
  /* Typography Scale */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  
  /* Spacing System */
  --space-1: 0.25rem;    /* 4px */
  --space-2: 0.5rem;     /* 8px */
  --space-4: 1rem;       /* 16px */
  --space-6: 1.5rem;     /* 24px */
  --space-8: 2rem;       /* 32px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  
  /* Layout System */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

/* Dark Theme - Use dark colors from project spec */
[data-theme="dark"] {
  --bg-primary: [spec-dark-bg];
  --bg-secondary: [spec-dark-secondary];
  --text-primary: [spec-dark-text];
  --text-secondary: [spec-dark-text-muted];
  --border-color: [spec-dark-border];
}

/* System Theme Preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: [spec-dark-bg];
    --bg-secondary: [spec-dark-secondary];
    --text-primary: [spec-dark-text];
    --text-secondary: [spec-dark-text-muted];
    --border-color: [spec-dark-border];
  }
}

/* Base Typography */
.text-heading-1 {
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-6);
}

/* Layout Components */
.container {
  width: 100%;
  max-width: var(--container-lg);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.grid-2-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

@media (max-width: 768px) {
  .grid-2-col {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

/* Theme Toggle Component */
.theme-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 4px;
  transition: all 0.3s ease;
}

.theme-toggle-option {
  padding: 8px 12px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-toggle-option.active {
  background: var(--primary-500);
  color: white;
}

/* Base theming for all elements */
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

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// Theme Management System
class ThemeManager {
  constructor() {
    this.currentTheme = this.getStoredTheme() || this.getSystemTheme();
    this.applyTheme(this.currentTheme);
    this.initializeToggle();
  }

  getSystemTheme() {
    return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
  }

  getStoredTheme() {
    return localStorage.getItem('theme');
  }

  applyTheme(theme) {
    if (theme === 'system') {
      document.documentElement.removeAttribute('data-theme');
      localStorage.removeItem('theme');
    } else {
      document.documentElement.setAttribute('data-theme', theme);
      localStorage.setItem('theme', theme);
    }
    this.currentTheme = theme;
    this.updateToggleUI();
  }

  initializeToggle() {
    const toggle = document.querySelector('.theme-toggle');
    if (toggle) {
      toggle.addEventListener('click', (e) => {
        if (e.target.matches('.theme-toggle-option')) {
          const newTheme = e.target.dataset.theme;
          this.applyTheme(newTheme);
        }
      });
    }
  }

  updateToggleUI() {
    const options = document.querySelectorAll('.theme-toggle-option');
    options.forEach(option => {
      option.classList.toggle('active', option.dataset.theme === this.currentTheme);
    });
  }
}

// Initialize theme management
document.addEventListener('DOMContentLoaded', () => {
  new ThemeManager();
});

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<!-- Theme Toggle Component (place in header/navigation) -->
<div class="theme-toggle" role="radiogroup" aria-label="Theme selection">
  <button class="theme-toggle-option" data-theme="light" role="radio" aria-checked="false">
    <span aria-hidden="true">☀️</span> Light
  </button>
  <button class="theme-toggle-option" data-theme="dark" role="radio" aria-checked="false">
    <span aria-hidden="true">🌙</span> Dark
  </button>
  <button class="theme-toggle-option" data-theme="system" role="radio" aria-checked="true">
    <span aria-hidden="true">💻</span> System
  </button>
</div>

css/
├── design-system.css    # Variables and tokens (includes theme system)
├── layout.css          # Grid and container system
├── components.css      # Reusable component styles (includes theme toggle)
├── utilities.css       # Helper classes and utilities
└── main.css            # Project-specific overrides
js/
├── theme-manager.js     # Theme switching functionality
└── main.js             # Project-specific JavaScript

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