/* GLOBAL RESET */

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

body {
    font-family: Arial, Helvetica, sans-serif;
    background: #fafafa;
    color: #222;
    line-height: 1.6;
}


/* HEADER */

header {
    background: #1f2933;
    color: white;
    padding: 18px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.4rem;
}

nav a {
    color: #ddd;
    text-decoration: none;
}

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


/* MAIN LAYOUT */

main {
    max-width: 900px;
    margin: auto;
    padding: 40px 20px;
}


/* INTRO SECTION (ONLY COSMETIC ONE) */

.hero {
    text-align: center;
    margin-bottom: 60px;
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.hero p {
    max-width: 650px;
    margin: auto;
}


/* GENERAL SECTIONS */

section {
    margin-bottom: 50px;
}

section h2 {
    font-size: 1.6rem;
    margin-bottom: 12px;
    border-bottom: 2px solid #e5e5e5;
    padding-bottom: 6px;
}

section h3 {
    margin-top: 20px;
    margin-bottom: 8px;
}


/* TEXT */

p {
    margin-bottom: 12px;
}


/* DIAGRAMS */

.diagram {
    margin-top: 15px;
    text-align: center;
}

.diagram img {
    max-width: 100%;
    border: 1px solid #ddd;
}

.caption {
    font-size: 0.9rem;
    color: #666;
    margin-top: 5px;
}


/* CODE BLOCKS (IMPORTANT FOR TUTORIALS) */

pre {
    background: #1f2933;
    color: #e6edf3;
    padding: 14px;
    border-radius: 4px;
    overflow-x: auto;
    margin-top: 10px;
}

code {
    font-family: monospace;
    font-weight: 600;
    background: #ebebeb;
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 0.9em;
}

pre code {
    background: none;
    padding: 0;
    border-radius: 0;
    font-weight: normal;
    font-size: inherit;
}


/* LISTS */

ul {
    padding-left: 20px;
}

li {
    margin-bottom: 6px;
}


/* FOOTER */

footer {
    text-align: center;
    padding: 25px;
    margin-top: 60px;
    border-top: 1px solid #ddd;
    color: #666;
}