/* Global Styles */
:root {
    --primary-color: #1a1a1a;
    --secondary-color: #2ecc71;
    --text-color: #e0e0e0;
    --background-color: #121212;
    --header-bg: #1a1a1a;
    --link-color: #2ecc71;
    --link-hover: #27ae60;
    --card-bg: #1e1e1e;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
header {
    background-color: var(--header-bg);
    padding: 2rem;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--secondary-color);
    position: relative;
}

header h1 {
    color: var(--secondary-color);
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

/* Mobile Menu Button */
.menu-button {
    display: none;
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--secondary-color);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* Main Content Layout */
main {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

/* Navigation Styles */
nav {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    width: 250px;
    position: sticky;
    top: 20px;
    border-left: 3px solid var(--secondary-color);
    transition: all 0.3s ease;
}

nav p {
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

nav a {
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: block;
    padding: 0.5rem 0;
}

nav a:hover {
    color: var(--link-hover);
    transform: translateX(5px);
}

/* Article Styles */
article {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    flex: 1;
    border-left: 3px solid var(--secondary-color);
}

article h2 {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    font-size: 2rem;
}

article h3 {
    color: var(--secondary-color);
    margin: 1.5rem 0 1rem;
    font-size: 1.5rem;
}

article p {
    margin-bottom: 1rem;
}

/* List Styles */
ul {
    list-style-position: inside;
    margin-left: 1rem;
}

li {
    margin-bottom: 0.5rem;
}

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

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

/* Footer Styles */
footer {
    text-align: center;
    padding: 1.5rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    color: var(--text-color);
    margin-top: 2rem;
    border-top: 2px solid var(--secondary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .menu-button {
        display: block;
    }
    
    main {
        flex-direction: column;
    }
    
    nav {
        width: 100%;
        position: static;
        margin-bottom: 1rem;
        max-height: 0;
        overflow: hidden;
        padding: 0;
        opacity: 0;
        transition: all 0.3s ease;
    }
    
    nav.active {
        max-height: 1000px;
        padding: 1.5rem;
        opacity: 1;
    }
    
    header {
        padding: 1.5rem;
    }
    
    article {
        padding: 1.5rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    article h2 {
        font-size: 1.75rem;
    }
    
    article h3 {
        font-size: 1.25rem;
    }
}