/* ==========================================================================
   Header Styles
   ==========================================================================
   Navigation, logo, mobile menu, sticky header, and CTA button.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Site Header
   -------------------------------------------------------------------------- */

.site-header {
    position: relative;
    width: 100%;
    background-color: var(--bg-primary);
    border-bottom: var(--border-width) solid var(--border-color);
    z-index: var(--z-sticky);
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header--sticky {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
}

/* Add padding to body when sticky header is active */
body.has-sticky-header {
    padding-top: var(--header-height, 80px);
}

.site-header--scrolled {
    box-shadow: var(--shadow-md);
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    gap: var(--space-xl);
}


/* --------------------------------------------------------------------------
   Logo / Brand
   -------------------------------------------------------------------------- */

.site-header__brand {
    flex-shrink: 0;
}

.site-header__logo-link {
    display: flex;
    align-items: center;
}

.site-header__logo {
    max-height: 48px;
    width: auto;
}

.site-header__site-name {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    letter-spacing: var(--tracking-tight);
}


/* --------------------------------------------------------------------------
   Desktop Navigation
   -------------------------------------------------------------------------- */

.site-header__nav {
    display: flex;
    align-items: center;
}

.site-header__menu {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    list-style: none;
}

.site-header__menu li {
    position: relative;
}

.site-header__menu > li > a {
    display: inline-flex;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__menu > li > a:hover,
.site-header__menu > li.current-menu-item > a,
.site-header__menu > li.current-menu-ancestor > a {
    color: var(--color-primary);
    background-color: var(--color-primary-50);
}

/* Dropdown menu */
.site-header__menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    padding: var(--space-sm);
    background-color: var(--bg-primary);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
    z-index: var(--z-dropdown);
}

.site-header__menu li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.site-header__menu .sub-menu li a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__menu .sub-menu li a:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-50);
}


/* --------------------------------------------------------------------------
   Header Actions
   -------------------------------------------------------------------------- */

.site-header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-shrink: 0;
}

.site-header__cta {
    display: none;
}

@media (min-width: 1025px) {
    .site-header__cta {
        display: inline-flex;
    }
}


/* --------------------------------------------------------------------------
   Mobile Menu Toggle (Hamburger)
   -------------------------------------------------------------------------- */

.site-header__menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
    z-index: calc(var(--z-overlay) + 1);
}

.site-header__hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 24px;
    height: 24px;
}

.site-header__hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 1px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Hamburger to X animation */
.site-header__menu-toggle[aria-expanded="true"] .site-header__hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__hamburger-line:nth-child(2) {
    opacity: 0;
}

.site-header__menu-toggle[aria-expanded="true"] .site-header__hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 1024px) {
    .site-header__menu-toggle {
        display: flex;
    }

    .site-header__nav {
        display: none;
    }
}


/* --------------------------------------------------------------------------
   Mobile Menu Panel
   -------------------------------------------------------------------------- */

.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-overlay);
    pointer-events: none;
}

.mobile-menu[aria-hidden="false"] {
    pointer-events: auto;
}

/* Overlay */
.mobile-menu__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.mobile-menu[aria-hidden="false"] .mobile-menu__overlay {
    opacity: 1;
}

/* Panel */
.mobile-menu__panel {
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    max-width: 380px;
    height: 100%;
    background-color: var(--bg-primary);
    padding: var(--space-xl);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    box-shadow: var(--shadow-2xl);
}

.mobile-menu[aria-hidden="false"] .mobile-menu__panel {
    transform: translateX(0);
}

/* Close button */
.mobile-menu__close {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.mobile-menu__close:hover {
    color: var(--text-primary);
    background-color: var(--bg-secondary);
}

/* Mobile navigation list */
.mobile-menu__nav {
    margin-top: var(--space-3xl);
}

.mobile-menu__list {
    list-style: none;
}

.mobile-menu__list > li {
    border-bottom: var(--border-width) solid var(--border-color);
}

.mobile-menu__list > li > a {
    display: block;
    padding: var(--space-md) 0;
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.mobile-menu__list > li > a:hover,
.mobile-menu__list > li.current-menu-item > a {
    color: var(--color-primary);
}

/* Mobile sub-menu */
.mobile-menu__list .sub-menu {
    list-style: none;
    padding-bottom: var(--space-sm);
}

.mobile-menu__list .sub-menu li a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-base);
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.mobile-menu__list .sub-menu li a:hover {
    color: var(--color-primary);
}

/* Mobile CTA */
.mobile-menu__cta {
    margin-top: var(--space-xl);
}