body {
    background: #f9f9fc;
    color: #2c3e50;
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header, footer {
    background: #0074d9;
    color: #fff;
    padding: 1.5em 0;
    text-align: center;
}
nav {
    margin: 1em 0;
    text-align: center;
}
nav a {
    color: #0074d9;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
    font-size: 1.1em;
    padding: 8px 12px;
    border-radius: 5px;
    transition: background 0.2s;
}
nav a:hover {
    background: #e0e7ff;
}
.container {
    width: 95%;
    max-width: 650px;
    margin: 2em auto;
    padding: 2em;
    background: #fff;
    border-radius: 13px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.07);
}
h1 {
    color: #0074d9;
    font-size: 2.1em;
    margin-bottom: 0.5em;
}
h2 {
    color: #005fa3;
    margin-top: 1.2em;
}
ul, ol {
    margin-left: 1.7em;
}
footer {
    margin-top: 3em;
    font-size: 1em;
}
.button {
    background: #0074d9;
    color: #fff;
    border: none;
    padding: 12px 32px;
    font-size: 1.2em;
    border-radius: 8px;
    margin-top: 1.6em;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
.button:hover {
    background: #005fa3;
}