/* ==========================================================================
   Header - Sticky Navigation, Mega Menu, Mobile Menu
   ========================================================================== */

/* ---------- Main Header ---------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-header);
    padding: 1rem 0;
    transition: all var(--transition-base);
    background: var(--color-white);
    box-shadow: var(--shadow-xs);
}

.site-header--transparent {
    background: transparent;
    box-shadow: none;
}

.site-header--scrolled {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-md);
    padding: 0.65rem 0;
}

.site-header--scrolled.site-header--transparent {
    background: rgba(255, 255, 255, 0.97);
}

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

/* ---------- Logo ---------- */
.site-header__logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    transition: opacity var(--transition-fast);
}

.site-header__logo:hover {
    opacity: 0.8;
}

.site-header__logo-img {
    height: 45px;
    width: auto;
    transition: all var(--transition-base);
}

/* Make logo white on transparent (dark) header */
.site-header--transparent .site-header__logo-img {
    filter: brightness(0) invert(1);
}

/* Restore original logo color on scrolled header */
.site-header--scrolled .site-header__logo-img {
    height: 38px;
    filter: none;
}

/* ---------- Desktop Navigation ---------- */
.site-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

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

.site-nav__list > .menu-item > a {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0.5rem 1rem;
    font-size: var(--fs-small);
    font-weight: var(--fw-medium);
    color: var(--color-navy);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.site-header--transparent .site-nav__list > .menu-item > a {
    color: var(--color-white);
}

.site-header--scrolled .site-nav__list > .menu-item > a {
    color: var(--color-navy);
}

.site-nav__list > .menu-item > a:hover,
.site-nav__list > .menu-item.current-menu-item > a {
    color: var(--color-primary);
    background: rgba(var(--color-primary-rgb), 0.08);
}

.site-header--transparent .site-nav__list > .menu-item > a:hover {
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.12);
}

.site-header--scrolled .site-nav__list > .menu-item > a:hover {
    color: var(--color-primary);
    background: rgba(var(--color-primary-rgb), 0.08);
}

.dropdown-arrow {
    transition: transform var(--transition-fast);
}

.menu-item-has-children:hover .dropdown-arrow {
    transform: rotate(180deg);
}

/* ---------- Mega Menu Dropdown ---------- */
/* .has-mega-menu is position:static so the containing block is .site-header__inner */
.has-mega-menu {
    position: static;
}

.mega-menu {
    position: absolute;
    /* Anchored to .site-header__inner — spans full header content width */
    top: calc(100% + 1rem); /* 100% = bottom of inner, +1rem = header padding-bottom */
    left: 0;
    right: 0;
    transform: translateY(10px);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-gray-100);
    padding: var(--space-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base);
    pointer-events: none;
    z-index: var(--z-dropdown);
}

.has-mega-menu:hover .mega-menu,
.has-mega-menu:focus-within .mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.mega-menu .menu-item a {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    color: var(--color-navy);
}

.mega-menu .menu-item a:hover {
    background: var(--color-off-white);
    color: var(--color-primary);
}

.mega-menu__icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.mega-menu .menu-item a:hover .mega-menu__icon {
    background: var(--color-primary);
    color: var(--color-white);
}

.mega-menu__icon svg {
    width: 20px;
    height: 20px;
}

.mega-menu__content {
    display: flex;
    flex-direction: column;
}

.mega-menu__title {
    font-weight: var(--fw-semibold);
    font-size: var(--fs-body);
    line-height: 1.3;
}

.mega-menu__desc {
    font-size: var(--fs-xs);
    color: var(--color-gray-500);
    margin-top: 2px;
}

/* ---------- Theme Toggle ---------- */
.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: var(--theme-mode-toggle-bg, rgba(0,0,0,0.06));
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    flex-shrink: 0;
    position: relative;
    color: var(--color-navy);
}

.site-header--transparent .theme-toggle {
    background: rgba(255,255,255,0.08);
    color: #fff;
}

.site-header--scrolled .theme-toggle {
    background: var(--theme-mode-toggle-bg, rgba(0,0,0,0.06));
    color: var(--theme-text-heading, var(--color-navy));
}

[data-theme="dark"] .theme-toggle {
    color: #FCD34D;
}

.theme-toggle:hover {
    background: rgba(var(--color-primary-rgb), 0.12);
    transform: scale(1.08);
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Sun icon (shown in dark mode) */
.theme-toggle__sun {
    position: absolute;
    opacity: 0;
    transform: rotate(-90deg) scale(0.5);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Moon icon (shown in light mode) */
.theme-toggle__moon {
    position: absolute;
    opacity: 1;
    transform: rotate(0deg) scale(1);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark mode: show sun, hide moon */
[data-theme="dark"] .theme-toggle__sun {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

[data-theme="dark"] .theme-toggle__moon {
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
}

/* ---------- Header CTA ---------- */
.site-header__cta {
    flex-shrink: 0;
}

.site-header--transparent .site-header__cta {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    color: var(--color-white);
}

.site-header--transparent .site-header__cta:hover {
    background: var(--color-white);
    border-color: var(--color-white);
    color: var(--color-navy);
}

.site-header--scrolled .site-header__cta {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

/* ---------- Hamburger Toggle ---------- */
.site-header__toggle {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
    z-index: calc(var(--z-overlay) + 1);
}

.site-header__toggle:hover {
    background: rgba(var(--color-primary-rgb), 0.08);
}

.hamburger {
    width: 22px;
    height: 16px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
}

.hamburger__line {
    width: 100%;
    height: 2px;
    background: var(--color-navy);
    border-radius: 2px;
    transition: all var(--transition-base);
    transform-origin: center;
}

.site-header--transparent .hamburger__line {
    background: var(--color-white);
}

.site-header--scrolled .hamburger__line {
    background: var(--color-navy);
}

/* Hamburger to X animation */
body.menu-open .hamburger__line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
    background: var(--color-navy);
}

body.menu-open .hamburger__line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

body.menu-open .hamburger__line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
    background: var(--color-navy);
}

/* ---------- Mobile Menu Overlay ---------- */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background: var(--color-white);
    z-index: var(--z-overlay);
    padding: 5rem var(--container-px) var(--space-2xl);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    display: none;
}

body.menu-open .mobile-menu {
    transform: translateX(0);
}

.mobile-menu__inner {
    max-width: 400px;
    margin: 0 auto;
}

.mobile-menu__list {
    display: flex;
    flex-direction: column;
}

.mobile-menu__list > li {
    border-bottom: 1px solid var(--color-gray-100);
}

.mobile-menu__list > li > a {
    display: block;
    padding: 1rem 0;
    font-size: var(--fs-body-lg);
    font-weight: var(--fw-medium);
    color: var(--color-navy);
    transition: color var(--transition-fast);
}

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

.mobile-menu__has-sub {
    position: relative;
}

.mobile-menu__has-sub > a {
    padding-right: 3rem;
}

.mobile-menu__expand {
    position: absolute;
    top: 0.75rem;
    right: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    color: var(--color-gray-500);
}

.mobile-menu__expand:hover {
    background: var(--color-off-white);
    color: var(--color-primary);
}

.mobile-menu__expand svg {
    transition: transform var(--transition-fast);
}

.mobile-menu__expand.is-expanded svg {
    transform: rotate(180deg);
}

.mobile-menu__sub {
    display: none;
    padding-bottom: var(--space-md);
    padding-left: var(--space-lg);
}

.mobile-menu__sub.is-open {
    display: block;
}

.mobile-menu__sub li a {
    display: block;
    padding: 0.6rem 0;
    font-size: var(--fs-body);
    color: var(--color-gray-600);
    transition: color var(--transition-fast);
}

.mobile-menu__sub li a:hover {
    color: var(--color-primary);
}

/* ---------- Focus-Visible Styles ---------- */
.site-nav__list > .menu-item > a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-md);
}

.site-header__toggle:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}