/* Modern, consistent CSS for all kata HTML pages */

body {
    font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
    background: #f7f8fa;
    color: #222;
    margin: 0;
    padding: 0;
}

header, nav {
    background: #2d3e50;
    color: #fff;
    padding: 0.5rem 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    font-size: 1.1rem;
}

nav a {
    color: #fff;
    text-decoration: none;
    padding: 0.3em 0.8em;
    border-radius: 4px;
    transition: background 0.2s;
}

nav a.active, nav a:hover {
    background: #4a6fa5;
}

main {
    max-width: 700px;
    margin: 2rem auto;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 16px rgba(0,0,0,0.07);
    padding: 2rem 2.5rem;
}

h1, h2, h3 {
    color: #2d3e50;
    margin-top: 0;
}

ul {
    padding-left: 1.5em;
}

footer {
    text-align: center;
    color: #888;
    font-size: 0.95em;
    margin: 2rem 0 1rem 0;
}