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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: #ffffff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

/* Header */
header {
    background-color: #1976d2;
    color: #ffffff;
    padding: 2rem;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

/* Navigation */
.nav-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.nav-links a {
    color: #ffffff;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-links a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Main Content */
main {
    flex: 1;
    padding: 2rem;
}

.content {
    max-width: 800px;
    margin: 0 auto;
}

.content h1 {
    color: #1976d2;
    font-size: 2rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid #1976d2;
    padding-bottom: 0.5rem;
}

.content h2 {
    color: #1976d2;
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content h3 {
    color: #424242;
    font-size: 1.2rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

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

.content ul,
.content ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content li {
    margin-bottom: 0.5rem;
}

.content ul ul,
.content ol ul {
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
}

.content a {
    color: #1976d2;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-bottom 0.3s;
}

.content a:hover {
    border-bottom: 1px solid #1976d2;
}

.last-updated {
    color: #666;
    font-style: italic;
    margin-bottom: 2rem;
}

.intro {
    font-size: 1.1rem;
    color: #555;
    margin-bottom: 2rem;
}

/* Footer */
footer {
    background-color: #f5f5f5;
    padding: 1.5rem;
    text-align: center;
    color: #666;
    border-top: 1px solid #e0e0e0;
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        padding: 1.5rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .nav-links a {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }

    main {
        padding: 1.5rem;
    }

    .content h1 {
        font-size: 1.75rem;
    }

    .content h2 {
        font-size: 1.3rem;
    }

    .content h3 {
        font-size: 1.1rem;
    }

    .content ul,
    .content ol {
        margin-left: 1.5rem;
    }
}

@media (max-width: 480px) {
    header {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.25rem;
    }

    .nav-links {
        flex-direction: column;
        gap: 0.5rem;
    }

    main {
        padding: 1rem;
    }

    .content h1 {
        font-size: 1.5rem;
    }

    .content h2 {
        font-size: 1.2rem;
    }
}