/* Base styles */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    color: #333;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    color: #2c3e50;
    font-size: 2.5em;
}

.intro {
    font-size: 1.2em;
    color: #7f8c8d;
}

h2 {
    color: #2c3e50;
    font-size: 2em;
    margin: 30px auto 20px;
    font-weight: 600;
    line-height: 1.3;
    text-align: center;
}
/* Timeline section */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
}

.timeline-item {
    border-left: 3px solid #3498db;
    padding: 20px;
    margin: 20px 0;
    position: relative;
}

.timeline-item h3 {
    color: #3498db;
    margin: 0;
}

.timeline-item p {
    margin: 10px 0 0;
}

/* Features section */
.features ul {
    list-style-type: none;
    padding: 0;
}

.features li {
    padding: 10px;
    margin: 5px 0;
    background-color: #f8f9fa;
    border-radius: 4px;
}

/* Code example section */
.code-container {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
}

pre {
    margin: 0;
}

code {
    font-family: 'Courier New', Courier, monospace;
}

/* Selectors table */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th, td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

th {
    background-color: #3498db;
    color: white;
}

tr:nth-child(even) {
    background-color: #f8f9fa;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    border-top: 1px solid #ddd;
}

footer a {
    color: #3498db;
    text-decoration: none;
}

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

.back-button {
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 14px;
    margin: 4px 2px;
    cursor: pointer;
    border-radius: 4px;
}

.back-button:hover {
    background-color: #45a049;
}

/* Responsive design */
@media screen and (max-width: 600px) {
    body {
        padding: 10px;
    }
    
    .timeline-item {
        padding: 10px;
    }
    
    table {
        font-size: 0.9em;
    }
    
    th, td {
        padding: 8px;
    }
}