sample.css

/* Hello World CSS - A sample stylesheet */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --text-color: #333;
    --bg-color: #f5f5f5;
}

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

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container { max-width: 1200px; margin: 0 auto; padding: 2rem; }

.card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s ease;
}

.card:hover { transform: translateY(-2px); }

@media (max-width: 768px) {
    .container { padding: 1rem; }
}