header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
}

header h1 {
    font-size: 2rem;
    margin: 0;
}

header nav {
    display: flex;
    gap: 1rem;
}

header nav a {
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

header nav a:hover {
    color: #ffcc00;
}

/* 响应式样式 */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: center;
    }

    header nav {
        margin-top: 1rem;
    }
}