site-header {
    display: block;
}

site-header header {
    background: #fff;
    padding: 1rem 3vw;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

site-header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1800px;
    margin: 0 auto;
    min-height: 44px;
}

site-header .logo {
    display: flex;
    align-self: center;
}

site-header .logo img {
    height: 35px;
    width: auto;
}

site-header .nav-links {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}

site-header .nav-links a {
    text-decoration: none;
    color: #333;
    transition: color var(--transition-fast);
}

site-header .nav-links a:hover {
    color: var(--color-accent-dark);
}

site-header .nav-group {
    position: relative;
}

site-header .nav-group-label {
    cursor: pointer;
    padding: 0.5rem 0;
    transition: color var(--transition-fast);
}

site-header .nav-group-label:hover {
    color: var(--color-accent-dark);
}

site-header .nav-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    list-style: none;
    min-width: 180px;
    border-radius: 4px;
    padding: 0.5rem 0;
    z-index: 100;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

site-header .nav-group:hover .nav-dropdown {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

site-header .nav-dropdown li {
    padding: 0;
}

site-header .nav-dropdown a {
    display: block;
    padding: 0.5rem 1rem;
    transition: background var(--transition-fast), padding-left var(--transition-fast);
}

site-header .nav-dropdown a:hover {
    background: var(--color-accent);
    padding-left: 1.25rem;
}

site-header .btn-donate {
    background: var(--color-accent);
    color: #333;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

site-header .btn-donate:hover {
    background: var(--color-accent-dark);
    color: #FFF!important;
    transform: scale(1.05);
}

/* Hamburger */
site-header .hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
    align-self: center;
}

site-header .hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    border-radius: 2px;
    transition: all 0.3s ease;
}

site-header .hamburger.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

site-header .hamburger.open span:nth-child(2) {
    opacity: 0;
}

site-header .hamburger.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu Overlay */
site-header .mobile-menu-overlay {
    opacity: 0;
    visibility: hidden;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
    transition: opacity var(--transition-medium), visibility var(--transition-medium);
}

site-header .mobile-menu-overlay.open {
    opacity: 1;
    visibility: visible;
}

/* Mobile Menu */
site-header .mobile-menu {
    display: block;
    position: fixed;
    top: 0;
    right: -280px;
    width: 280px;
    height: 100vh;
    background: #fff;
    padding: 70px 1.5rem 2rem;
    overflow-y: auto;
    transition: right var(--transition-medium);
    z-index: 1000;
}

site-header .mobile-menu.open {
    right: 0;
}

site-header .mobile-nav-links {
    list-style: none;
}

site-header .mobile-nav-links > li {
    border-bottom: 1px solid #eee;
}

site-header .mobile-nav-links a {
    display: block;
    padding: 1rem 0;
    text-decoration: none;
    color: #333;
    font-size: 1.1rem;
}

site-header .mobile-nav-group {
    border-bottom: 1px solid #eee;
}

site-header .mobile-nav-group-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

site-header .mobile-nav-group-label:hover {
    color: var(--color-accent-dark);
}

site-header .mobile-nav-group-label::after {
    content: '▾';
    transition: transform var(--transition-medium);
}

site-header .mobile-nav-group-label.open::after {
    transform: rotate(180deg);
}

site-header .mobile-nav-dropdown {
    max-height: 0;
    overflow: hidden;
    padding-left: 1rem;
    opacity: 0;
    transition: max-height var(--transition-medium), opacity var(--transition-medium), padding var(--transition-medium);
}

site-header .mobile-nav-dropdown.open {
    max-height: 500px;
    opacity: 1;
    padding-left: 1rem;
}

site-header .mobile-nav-dropdown a {
    padding: 0.75rem 0;
    color: #666;
    font-size: 1rem;
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

site-header .mobile-nav-dropdown a:hover {
    color: var(--color-accent-dark);
    padding-left: 0.5rem;
}

site-header .mobile-menu .btn-donate {
    display: block;
    margin-top: 1rem;
    text-align: center;
    padding: 0.75rem 1rem;
}

site-header .mobile-close {
    display: none;
    position: absolute;
    top: 1.35rem;
    right: 1rem;
    width: 30px;
    height: 30px;
    cursor: pointer;
}

site-header .mobile-close::before,
site-header .mobile-close::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 3px;
    background: #333;
    top: 50%;
    left: 0;
}

site-header .mobile-close::before {
    transform: rotate(45deg);
}

site-header .mobile-close::after {
    transform: rotate(-45deg);
}

/* Desktop - hide mobile elements */
@media (min-width: 950px) {
    site-header .hamburger,
    site-header .mobile-menu,
    site-header .mobile-close,
    site-header .mobile-menu-overlay {
        display: none !important;
    }
}

/* Mobile */
@media (max-width: 950px) {
    site-header {
        position: relative;
    }

    site-header .nav-links {
        display: none;
    }

    site-header .hamburger {
        display: flex;
    }

    site-header .mobile-close {
        display: block;
    }

    site-header .mobile-menu {
        display: block;
    }
}