header {
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 10;
}

header img {
    height: 3rem;
}

nav a, a.btn {
    color: #333;
    text-decoration: none;
    margin-left: 1.25rem;
    font-weight: 600;
    transition: color 0.2s;
}

nav a:hover, a.btn:hover {
    color: #ff6f61;
}