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

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-header);
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
}

.header-main {
    height: var(--header-height);
    padding: 16px 0;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.header-logo {
    flex-shrink: 0;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
}

.logo-link:hover {
    color: var(--color-text-primary);
}

.logo-text {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-initials {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--color-accent);
    letter-spacing: 0.05em;
}

.logo-full {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    line-height: var(--line-height-tight);
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 10px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-link--active {
    color: var(--color-text-primary);
}

.dropdown-arrow {
    transition: transform var(--transition-fast);
    margin-left: 2px;
}

/* Dropdown Menu */
.nav-item--has-dropdown:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

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

.sub-menu,
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 4px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-xl);
    list-style: none;
    z-index: var(--z-dropdown);
}

.sub-menu .nav-item,
.dropdown-menu .nav-item {
    display: block;
}

.dropdown-link {
    display: block;
    padding: 8px 16px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-regular);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.dropdown-link:hover {
    color: var(--color-accent);
    background-color: rgba(255, 255, 255, 0.03);
}

/* ==========================================================================
   Megamenu
   ========================================================================= */

.nav-item--has-megamenu {
    position: static;
}

.megamenu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-top: 2px solid var(--color-accent);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: var(--z-dropdown);
}

.nav-item--has-megamenu:hover > .megamenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.megamenu-inner {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 1.5rem 2rem;
}

.megamenu-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    list-style: none;
    margin: 0;
    padding: 0;
}

.megamenu-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.megamenu-link {
    display: block;
    padding: 0.5rem 0.75rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-regular);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.15s ease, background-color 0.15s ease;
    border-left: 2px solid transparent;
}

.megamenu-link:hover {
    color: var(--color-accent);
    background-color: rgba(255, 255, 255, 0.03);
    border-left-color: var(--color-accent);
}

@media (max-width: 1024px) {
    .megamenu {
        display: none;
    }
}

@media (max-width: 768px) {
    .megamenu-grid {
        grid-template-columns: 1fr;
    }
}

/* Header CTA */
.header-cta {
    flex-shrink: 0;
}

.header-phone-btn {
    padding: 0.5rem 1.5rem;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: 0;
}

.header-phone-btn .phone-icon {
    width: 16px;
    height: 16px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: calc(var(--z-mobile-menu) + 1);
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
    transform-origin: center;
}

.mobile-menu-toggle.is-active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.is-active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.is-active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg-primary);
    z-index: var(--z-mobile-menu);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-base);
}

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

.mobile-menu-inner {
    padding: var(--spacing-xl) var(--container-padding);
}

.mobile-nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-nav-menu li {
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav-menu li a {
    display: block;
    padding: 16px 0;
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.mobile-nav-menu li a:hover {
    color: var(--color-accent);
}

.mobile-nav-menu .sub-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    background: none;
    border: none;
    box-shadow: none;
    padding: 0 0 0 var(--spacing-lg);
    min-width: unset;
}

.mobile-nav-menu .sub-menu li a {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: 14px 0;
    min-height: 44px;
    display: flex;
    align-items: center;
}

.mobile-menu-cta {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.mobile-phone-btn {
    width: 100%;
    justify-content: center;
    padding: 16px 24px;
    font-size: var(--font-size-base);
}

/* Body offset for fixed header */
body {
    padding-top: var(--header-height);
}