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

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

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    background-color: white;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    margin-top: 2rem;
    margin-bottom: 2rem;
}

/* Header styles */
header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid #e9ecef;
}

h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.updated-date {
    color: #6c757d;
    font-size: 1rem;
    font-style: italic;
}

/* Main content styles */
main {
    line-height: 1.8;
}

section {
    margin-bottom: 2.5rem;
}

h2 {
    color: #2c3e50;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
    border-left: 4px solid #007bff;
    padding-left: 1rem;
}

/* Intro section */
.intro {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 6px;
    border-left: 4px solid #28a745;
    margin-bottom: 2rem;
}

.intro p {
    font-size: 1.1rem;
    color: #495057;
    margin: 0;
}

/* Lists */
ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.75rem;
    color: #495057;
}

li strong {
    color: #2c3e50;
    font-weight: 600;
}

/* Links */
a {
    color: #007bff;
    text-decoration: none;
    font-weight: 500;
}

a:hover {
    color: #0056b3;
    text-decoration: underline;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        margin: 1rem;
        padding: 1.5rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.3rem;
    }
    
    .intro p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        margin: 0.5rem;
        padding: 1rem;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.2rem;
    }
}