/* ============================================
   HEADER / NAVIGATION
   Premium Multi-Level Header
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-fixed);
    background-color: transparent;
    transition: all var(--transition-normal);
}

.header--sticky {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    transform: translateY(-100%);
    animation: slideDown 0.3s ease forwards;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
    }
    to {
        transform: translateY(0);
    }
}

.header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-6) var(--spacing-6);
    max-width: 1440px;
    margin: 0 auto;
    transition: padding var(--transition-normal);
}

.header--sticky .header__container {
    padding: var(--spacing-4) var(--spacing-6);
}

/* Logo */
.header__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    z-index: var(--z-dropdown);
}

.header__logo-image {
    height: 50px;
    width: auto;
    transition: transform var(--transition-normal);
}

.header--sticky .header__logo-image {
    height: 40px;
}

.header__logo-text {
    font-family: var(--font-heading);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.header__logo-slogan {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    display: block;
}

/* Navigation */
.header__nav {
    display: none;
}

@media (min-width: 992px) {
    .header__nav {
        display: flex;
        align-items: center;
        gap: var(--spacing-8);
    }
}

.nav__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-6);
}

.nav__item {
    position: relative;
}

.nav__link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    color: var(--color-primary);
    padding: var(--spacing-2) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-normal);
}

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

.nav__link:hover::after {
    width: 100%;
}

/* Dropdown Menu */
.nav__dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 220px;
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-premium);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    padding: var(--spacing-3);
    z-index: var(--z-dropdown);
}

.nav__item:hover .nav__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav__dropdown-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.nav__dropdown-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: block;
}

.nav__dropdown-link:hover {
    background-color: var(--color-gray-100);
    color: var(--color-accent);
}

/* City Selector */
.header__city {
    position: relative;
    display: none;
}

@media (min-width: 1200px) {
    .header__city {
        display: block;
    }
}

.header__city-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.header__city-button:hover {
    background-color: var(--color-gray-100);
    color: var(--color-primary);
}

.header__city-icon {
    width: 18px;
    height: 18px;
}

.header__city-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 200px;
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-premium);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    padding: var(--spacing-3);
    margin-top: var(--spacing-2);
}

.header__city:hover .header__city-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.header__city-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.header__city-item {
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
}

.header__city-item:hover {
    background-color: var(--color-gray-100);
    color: var(--color-accent);
}

.header__city-item--active {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* Header Actions */
.header__actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.header__contact {
    display: none;
    flex-direction: column;
    align-items: flex-end;
}

@media (min-width: 992px) {
    .header__contact {
        display: flex;
    }
}

.header__phone {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-primary);
    white-space: nowrap;
}

.header__callback {
    font-size: var(--font-size-xs);
    color: var(--color-accent);
    text-decoration: underline;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.header__callback:hover {
    color: var(--color-accent-dark);
}

/* Mobile Menu Toggle */
.header__toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-2);
    cursor: pointer;
    z-index: var(--z-dropdown);
}

@media (min-width: 992px) {
    .header__toggle {
        display: none;
    }
}

.header__toggle-line {
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    transition: all var(--transition-normal);
}

.header__toggle.active .header__toggle-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.header__toggle.active .header__toggle-line:nth-child(2) {
    opacity: 0;
}

.header__toggle.active .header__toggle-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background-color: var(--color-white);
    box-shadow: var(--shadow-2xl);
    z-index: var(--z-modal);
    transition: right var(--transition-slow);
    overflow-y: auto;
    padding: var(--spacing-6);
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-8);
    padding-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
}

.mobile-menu__close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: var(--radius-full);
    transition: background-color var(--transition-fast);
}

.mobile-menu__close:hover {
    background-color: var(--color-gray-100);
}

.mobile-menu__list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.mobile-menu__item {
    border-bottom: 1px solid var(--color-border-light);
}

.mobile-menu__link {
    display: block;
    padding: var(--spacing-4) 0;
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

.mobile-menu__link:hover {
    color: var(--color-accent);
}

.mobile-menu__submenu {
    display: none;
    padding-left: var(--spacing-4);
    margin-top: var(--spacing-2);
}

.mobile-menu__item.active .mobile-menu__submenu {
    display: block;
}

.mobile-menu__contacts {
    margin-top: var(--spacing-8);
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--color-border);
}

.mobile-menu__phone {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-4);
    display: block;
}

.mobile-menu__social {
    display: flex;
    gap: var(--spacing-4);
    margin-top: var(--spacing-4);
}

.mobile-menu__social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background-color: var(--color-primary);
    color: var(--color-white);
    transition: all var(--transition-fast);
}

.mobile-menu__social-link:hover {
    background-color: var(--color-accent);
    transform: translateY(-3px);
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: var(--z-modal-backdrop);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}