/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS Custom Properties for light and dark themes */
:root {
    --bg-color: #f8f9fa;
    --container-bg: white;
    --text-color: #333;
    --heading-color: #2c3e50;
    --heading-secondary: #34495e;
    --nav-bg: #2c3e50;
    --nav-text: white;
    --nav-accent: #3498db;
    --link-color: #3498db;
    --link-hover: #2980b9;
    --code-bg: #f4f4f4;
    --border-color: #ddd;
    --table-bg: #f8f9fa;
    --blockquote-bg: #f8f9fa;
    --hr-color: #ecf0f1;
    --shadow: rgba(0, 0, 0, 0.1);
}

/* Dark mode variables - automatically applied when user prefers dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --container-bg: #2d2d2d;
        --text-color: #e0e0e0;
        --heading-color: #ffffff;
        --heading-secondary: #b0b0b0;
        --nav-bg: #1f1f1f;
        --nav-text: #ffffff;
        --nav-accent: #4fc3f7;
        --link-color: #4fc3f7;
        --link-hover: #81d4fa;
        --code-bg: #3a3a3a;
        --border-color: #555;
        --table-bg: #3a3a3a;
        --blockquote-bg: #3a3a3a;
        --hr-color: #555;
        --shadow: rgba(0, 0, 0, 0.3);
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--container-bg);
    min-height: 100vh;
    box-shadow: 0 0 20px var(--shadow);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

/* Navigation */
nav {
    background-color: var(--nav-bg);
    padding: 1rem 2rem;
    border-bottom: 3px solid var(--nav-accent);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

nav a {
    color: var(--nav-text);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--nav-accent);
}

/* Main content */
main {
    padding: 2rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    color: var(--heading-color);
    line-height: 1.2;
    transition: color 0.3s ease;
}

h1 {
    font-size: 2.5rem;
    border-bottom: 3px solid var(--nav-accent);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
    transition: border-color 0.3s ease;
}

h2 {
    font-size: 2rem;
    margin-top: 2rem;
    color: var(--heading-secondary);
}

h3 {
    font-size: 1.5rem;
    margin-top: 1.5rem;
    color: var(--heading-secondary);
}

p {
    margin-bottom: 1rem;
    text-align: justify;
}

/* Links */
a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Lists */
ul, ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Code blocks */
pre {
    background-color: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 1rem;
    overflow-x: auto;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

code {
    background-color: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

pre code {
    background-color: transparent;
    padding: 0;
}

/* Blockquotes */
blockquote {
    border-left: 4px solid var(--nav-accent);
    margin: 1rem 0;
    padding: 0.5rem 1rem;
    background-color: var(--blockquote-bg);
    font-style: italic;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Horizontal rules */
hr {
    border: none;
    border-top: 2px solid var(--hr-color);
    margin: 2rem 0;
    transition: border-color 0.3s ease;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

th, td {
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    text-align: left;
    transition: border-color 0.3s ease;
}

th {
    background-color: var(--table-bg);
    font-weight: 600;
    transition: background-color 0.3s ease;
}

tr:nth-child(even) {
    background-color: var(--table-bg);
    transition: background-color 0.3s ease;
}

/* Strong and emphasis */
strong {
    font-weight: 600;
    color: var(--heading-color);
    transition: color 0.3s ease;
}

em {
    font-style: italic;
    color: var(--heading-secondary);
    transition: color 0.3s ease;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        margin: 0;
        box-shadow: none;
    }
    
    nav {
        padding: 1rem;
    }
    
    main {
        padding: 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    pre {
        font-size: 0.8rem;
    }
}