:root {
    --primary-color: #0d47a1;
    --secondary-color: #1976d2;
    --bg-color: #888888;
    --text-color: #212529;
    --link-color: #0056b3;
    --border-color: #dee2e6;
    --code-bg: #e9ecef;
}
html {
    scroll-behavior: smooth;
}
body {
    display: flex;
    justify-content: space-between;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
}

div{
    max-width: 850px;
    margin: 40px auto;
    padding: 40px 50px;
    background: rgb(230, 230, 230);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}
@media (max-width: 768px) {
    main {
        margin: 20px;
        padding: 25px;
    }
}
h1, h2, h3, h4, h5, h6 {
    color: var(--primary-color);
    margin-top: 2em;
    margin-bottom: 0.75em;
    font-weight: 700;
    line-height: 1.3;
}
h1 { 
    font-size: 2.5em; 
    border-bottom: 3px solid var(--primary-color); 
    padding-bottom: 15px; 
    margin-top: 1em;
}
h2 { font-size: 1.8em; border-bottom: 1px solid var(--border-color); padding-bottom: 8px;}
h3 { font-size: 1.5em; color: var(--secondary-color); }
p, li { 
    font-size: 1.1em; 
    margin-bottom: 1.2em; 
}
a {
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}
a:hover { 
    color: var(--primary-color);
    text-decoration: underline; 
}
img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    margin: 25px 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    display: block;
}
ul, ol { 
    padding-left: 25px; 
    margin-bottom: 1.5em;
}
li { margin-bottom: 0.5em; }
strong { color: #111; }



#sidebar {
    height: fit-content;
    width: fit-content;
    background-color: #f8f8f8;
    position: -webkit-sticky;
    position: sticky;
}