nav {
    background: #222;
    color: #fff;
    padding: 10px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

nav ul {
    display: flex;
    gap: 15px;
}

nav ul li a {
    color: #fff;
    font-weight: bold;
}

footer {
    background: #222;
    color: #fff;
    text-align: center;
    padding: 15px 0;
    margin-top: 20px;
}

main {
    padding: 20px;
    max-width: 800px;
    margin: 20px auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.alert {
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 5px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
}

button {
    cursor: pointer;
    background: #007bff;
    color: #fff;
    border: none;
    border-radius: 5px;
    transition: 0.3s;
}

button:hover {
    background: #0056b3;
}