/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background-color: var(--color-bg-white);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base), background-color var(--transition-base);
}

.site-header.is-scrolled {
    box-shadow: var(--shadow-md);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
    height: 100px;
}

/* Logo */
.header__logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.header__logo img {
    max-height: 100px;
    width: auto;
}

.header__site-name {
    font-family: var(--font-heading);
    font-size: var(--fs-xl);
    font-weight: var(--fw-bold);
    color: var(--color-primary);
    white-space: nowrap;
}

/* Navigation */
.header__nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.nav-menu li {
    position: relative;
}

.nav-menu li a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-heading);
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background-color var(--transition-fast);
    white-space: nowrap;
}

.nav-menu li a:hover,
.nav-menu li.current-menu-item > a,
.nav-menu li.current_page_item > a {
    color: var(--color-primary);
    background-color: rgba(31, 78, 121, 0.06);
}

/* Dropdown */
.nav-menu .sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--color-bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--space-sm) 0;
    z-index: var(--z-dropdown);
}

.nav-menu li:hover > .sub-menu {
    display: block;
}

.nav-menu .sub-menu a {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--fs-sm);
    border-radius: 0;
}

/* Donate button in header */
.header__donate {
    flex-shrink: 0;
}

/* Hamburger toggle */
.header__toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
}

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 24px;
}

.hamburger span {
    display: block;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Active hamburger */
.header__toggle[aria-expanded="true"] .hamburger span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.header__toggle[aria-expanded="true"] .hamburger span:nth-child(2) {
    opacity: 0;
}

.header__toggle[aria-expanded="true"] .hamburger span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Mobile --- */
@media (max-width: 1024px) {
    .header__toggle {
        display: flex;
    }

    .header__donate {
        display: none;
    }

    .header__nav {
        display: none;
        position: absolute;
        top: 100px;
        left: 0;
        right: 0;
        background: var(--color-bg-white);
        box-shadow: var(--shadow-lg);
        padding: var(--space-lg);
        border-top: 1px solid var(--color-border);
    }

    .header__nav.is-open {
        display: block;
    }

    .nav-menu {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .nav-menu li a {
        padding: var(--space-md);
        border-bottom: 1px solid var(--color-border-light);
    }

    .nav-menu .sub-menu {
        position: static;
        box-shadow: none;
        padding-left: var(--space-lg);
    }

    .nav-menu li:hover > .sub-menu {
        display: block;
    }
}