header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 40px;
    position: sticky;
    top: 0;
    z-index: 10;
    background: white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo {
    font-size: 1.4em;
    font-weight: bold;
    color: #444;
    letter-spacing: 1px;
}

.logo img {
    max-height: 50px;
    width: auto;
    object-fit: contain;
}

.lang-switch {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.lang-switch a {
    text-decoration: none;
    color: #666;
    border: 1px solid #ccc;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.9em;
    transition: background .2s;
}

.lang-switch a:hover {
    background-color: #eee;
}