body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background: #f4f6f8;
    color: #222;
}

nav {
    background: #111;
    padding: 15px 0;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav a {
    color: #fff;
    margin: 0 15px;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

nav a:hover {
    color: #00bcd4;
}

.container {
    max-width: 900px;
    margin: 40px auto;
    background: #fff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

h1, h2, h3 {
    font-weight: 600;
    letter-spacing: 0.2px;
}

h2 {
    color: #0066cc;
}

ul {
    line-height: 1.8;
    padding-left: 20px;
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}