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

/* Body */
body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    background: #0b1e2d;
    color: #e6f2ff;
}

/* Header */
header {
    background: linear-gradient(135deg, #003366, #0055aa);
    padding: 40px 20px;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
}

header p {
    margin-top: 10px;
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Navigation */
nav {
    background: #001a33;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    flex-wrap: wrap;
}

nav li {
    margin: 10px;
}

nav a {
    color: #cce6ff;
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 6px;
    transition: background 0.3s;
}

nav a:hover {
    background: #0055aa;
}

/* Main content */
main {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
}

section {
    margin-bottom: 40px;
}

section h2 {
    margin-bottom: 10px;
    color: #66b3ff;
}

ul {
    margin-left: 20px;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    background: #001a33;
    margin-top: 40px;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 600px) {
    header h1 {
        font-size: 1.8rem;
    }

    nav ul {
        flex-direction: column;
        align-items: center;
    }
}