.header {
    background-color: var(--color-surface); 
    top: 0;
    height: 3.5rem;
    padding: 0;
    z-index: 1000;
    position: sticky; 
    box-shadow: var(--shadow-lg);
    border-bottom: var(--border-width) solid var(--color-primary-dark);
}

.header img {
    box-sizing: border-box;
}

.header nav {
    --nav-spacing: 1rem;
}

.header nav li {
    margin-right: var(--nav-spacing);
    margin-left: var(--nav-spacing);
    position: relative;
}

.header nav .account svg {
    width: 2rem;
    height: 2rem;
}

.header nav li:not(:first-child)::before {
    display: inline-block;
    content: "";
    background: var(--color-text);
    width: 3px;
    position: absolute;
    top: 0;
    bottom: 0;
    left: calc(-1 * var(--nav-spacing));
}

.header .link {
    text-decoration: none !important;
}

.header .link:hover {
    text-decoration: none !important;
    opacity: 0.8;
}

.header a.active {
    font-weight: bold;
    color: var(--color-primary-base) !important; 
    border-bottom: 3px solid var(--color-primary-base); 
    padding-bottom: 3px; 
    text-decoration: none !important;
}

.mobile-nav {
    background-color: var(--color-surface);
    order: 1;
    display: none;
    height: 3.5rem; 
    border-top: 1px solid var(--color-border);
    
    position: fixed;
    bottom: 0; 
    left: 0;
    right: 0;
    width: 100%;
    z-index: 2000; 
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

.mobile-nav ul {
    justify-content: space-evenly;
}

.mobile-nav ul li, .mobile-nav ul li a {
    height: 100%;
}

.mobile-nav ul li a {
    margin: 0;
    display: flex;
    align-items: center;
    text-decoration: none !important;
}

.mobile-nav a.active {
    transform: scale(1.25);
    color: var(--color-primary-base); 
}

.mobile-nav a:hover:not(.active) {
    transform: scale(1.25);
}

.mobile-nav a.active:not(:hover) {
    filter: brightness(0.9); 
}

.mobile-nav svg {
    width: 1.5rem;
    height: 1.5rem;
}

.user-menu-container {
    position: relative;
    display: inline-block;
}

.user-dropdown {
    display: none; 
    position: absolute;
    right: 0;
    top: 100%; 
    background-color: var(--color-surface);
    min-width: 200px;
    border-radius: var(--border-radius-sm);
    z-index: 1050;
    padding: 10px 0;
    margin-top: 10px; 
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border-top: 3px solid var(--color-primary-base); 
}

.user-dropdown.show {
    display: block;
}

.dropdown-header {
    padding: 8px 16px;
    font-size: 0.9rem;
    color: var(--color-text);
}

.dropdown-item {
    display: block;
    padding: 8px 16px;
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.dropdown-item:hover {
    background-color: var(--color-surface-alt);
    color: var(--color-primary-base);
    text-decoration: none;
}

.dropdown-divider {
    height: 1px;
    background-color: var(--color-border);
    margin: 8px 0;
}

.dropdown-section {
    padding: 8px 16px;
}

.lang-btn {
    border: 1px solid var(--color-border);
    background: transparent;
    border-radius: 4px;
    padding: 4px 8px;
    margin-right: 5px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: bold;
    color: var(--color-text-muted);
}

.lang-btn:hover {
    background-color: var(--color-surface-alt);
    color: var(--color-text);
}

.lang-btn.active {
    background-color: var(--color-primary-base);
    color: var(--color-primary-text);
    border-color: var(--color-primary-base);
}

@media (max-width: 768px) {
    .header nav ul.list-inline {
        display: none; 
    }
    .mobile-nav {
        display: block; 
    }
    .user-menu-container {
        margin-right: 1rem;
    }
    .user-dropdown {
        right: -10px; 
    }
}