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

/* CSS Custom Properties for theming */
:root {
    /* Colors - Light Theme */
    --color-primary: #007acc;
    --color-primary-dark: #005a9e;
    --color-secondary: #f39c12;
    --color-accent: #e74c3c;
    
    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #e9ecef;
    --color-bg-code: #f4f4f4;
    
    /* Text Colors */
    --color-text-primary: #333333;
    --color-text-secondary: #666666;
    --color-text-muted: #888888;
    --color-text-light: #ffffff;
    
    /* Border Colors */
    --color-border: #dee2e6;
    --color-border-light: #e9ecef;
    
    /* Success/Warning/Error Colors */
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-error: #dc3545;
    
    /* Typography */
    --font-family-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-family-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
    
    /* Font Sizes */
    --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;
    
    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
    
    /* Container Max Width */
    --container-max-width: 1200px;
    
    /* Header Height */
    --header-height: 70px;
    
    /* Custom colors from image */
  
    --color-bg-footer-dark: #212529;
    --color-green-feature: linear-gradient(135deg, #56ab2f 0%, #a8e063 100%);
    --color-purple-pink-feature: linear-gradient(135deg, #da4453 0%, #89216b 100%);
    --color-orange-yellow-feature: linear-gradient(135deg, #ff8c00 0%, #ffa500 100%);
    --color-bg-button-secondary-cta: #e9ecef;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg-primary: #1a1a1a;
    --color-bg-secondary: #2d2d2d;
    --color-bg-tertiary: #404040;
    --color-bg-code: #2d2d2d;
      --color-bg-page-header: #4a4b4c;
    --color-text-primary: #ffffff;
    --color-text-secondary: #cccccc;
    --color-text-muted: #999999;
    
    --color-border: #404040;
    --color-border-light: #555555;
}

/* Base HTML Elements */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    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: 600;
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

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

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

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

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

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

a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* Lists */
ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-secondary);
}

/* Code Elements */
code {
    font-family: var(--font-family-mono);
    font-size: 0.9em;
    background-color: var(--color-bg-code);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
}

pre {
    font-family: var(--font-family-mono);
    background-color: var(--color-bg-code);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--color-border);
}

pre code {
    background: none;
    padding: 0;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.hidden {
    display: none;
}

.visible {
    display: block;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-primary);
    color: var(--color-text-light);
    padding: 8px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 6px;
}

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

/* Button Reset */
button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* Image Responsive */
img {
    max-width: 100%;
    height: auto;
}

/* Selection Styling */
::selection {
    background-color: var(--color-primary);
    color: var(--color-text-light);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}