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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header styles */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-align: center;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

nav a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* Main content styles */
main {
    padding: 2rem 0;
}

section {
    background: white;
    margin: 2rem 0;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

h1, h2, h3 {
    margin-bottom: 1rem;
    color: #2c3e50;
}

h1 {
    font-size: 2.5rem;
    border-bottom: 3px solid #667eea;
    padding-bottom: 0.5rem;
}

h2 {
    font-size: 2rem;
    color: #667eea;
}

h3 {
    font-size: 1.5rem;
    color: #555;
}

p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

/* Card styles */
.card {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 6px;
    padding: 1.5rem;
    margin: 1rem 0;
}

.card.highlight {
    background: linear-gradient(135deg, #667eea20, #764ba220);
    border-color: #667eea;
}

.warning {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-left: 4px solid #fdcb6e;
}

.warning p:last-child {
    font-weight: 600;
    color: #856404;
}

/* List styles */
ul {
    margin: 1rem 0;
    padding-left: 2rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Code styles */
code {
    background: #f1f3f4;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.9rem;
    color: #d63384;
}

pre {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
    border-left: 4px solid #667eea;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

pre code {
    background: transparent;
    color: #f8f8f2;
    padding: 0;
    font-size: 0.85rem;
    line-height: 1.6;
}

ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

ol li {
    margin-bottom: 0.75rem;
}

/* Link styles */
a {
    color: #667eea;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Footer styles */
footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
}

footer a {
    color: #667eea;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    header h1 {
        font-size: 2rem;
    }

    nav ul {
        flex-direction: column;
        gap: 1rem;
    }

    section {
        padding: 1.5rem;
        margin: 1rem 0;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
a:focus, button:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}