/**
 * SeoTiGR — Header Styles
 * Стилі для липкого хедера з прозорістю та мега-меню
 */

/* ============================================================
   Обгортка хедера
   ============================================================ */

.seotigr-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    height: var(--header-height);
    transition: background-color var(--transition), box-shadow var(--transition), height var(--transition);
}

/* Прозорий стан на банері (над hero-секцією) */
.seotigr-header--transparent {
    background-color: transparent;
}

/* Стан після скролу */
.seotigr-header--scrolled {
    background-color: var(--color-primary);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
    height: 68px;
}

/* Внутрішній контейнер */
.seotigr-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: 1.5rem;
    gap: 2rem;
}

/* ============================================================
   Логотип
   ============================================================ */

.seotigr-header__logo {
    flex-shrink: 0;
    line-height: 1;
}

.seotigr-header__logo a {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    text-decoration: none;
}

.seotigr-header__logo img {
    height: 48px;
    width: auto;
    transition: opacity var(--transition);
}

.seotigr-header--scrolled .seotigr-header__logo img {
    filter: brightness(0) invert(1);
}

/* Текстовий логотип (fallback) */
.seotigr-header__logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 0.02em;
}

.seotigr-header__logo-text span {
    color: var(--color-accent);
}

.seotigr-header--transparent .seotigr-header__logo-text {
    color: var(--color-white);
}

/* ============================================================
   Основна навігація
   ============================================================ */

.seotigr-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.seotigr-nav__list {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0;
}

.seotigr-nav__item {
    position: relative;
}

.seotigr-nav__link {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 1rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.88);
    text-decoration: none;
    white-space: nowrap;
    transition: color var(--transition);
    border-radius: var(--radius-sm);
}

.seotigr-nav__link:hover,
.seotigr-nav__item--current > .seotigr-nav__link,
.seotigr-nav__item--current-ancestor > .seotigr-nav__link {
    color: var(--color-accent);
}

/* Підкреслення при активному стані */
.seotigr-nav__item--current > .seotigr-nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background-color: var(--color-accent);
    border-radius: 1px;
}

/* Стрілка дропдауну */
.seotigr-nav__link .nav-arrow {
    width: 16px;
    height: 16px;
    opacity: 0.7;
    transition: transform var(--transition);
}

.seotigr-nav__item:hover > .seotigr-nav__link .nav-arrow,
.seotigr-nav__item:focus-within > .seotigr-nav__link .nav-arrow {
    transform: rotate(180deg);
}

/* ============================================================
   Стандартний дропдаун
   ============================================================ */

.seotigr-nav__submenu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 220px;
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem 0;
    list-style: none;
    margin: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
    z-index: var(--z-dropdown);
    border-top: 3px solid var(--color-accent);
}

.seotigr-nav__item:hover > .seotigr-nav__submenu,
.seotigr-nav__item:focus-within > .seotigr-nav__submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.seotigr-nav__submenu a {
    display: block;
    padding: 0.625rem 1.25rem;
    font-size: 0.9rem;
    color: var(--color-text);
    transition: color var(--transition), background-color var(--transition), padding-left var(--transition);
}

.seotigr-nav__submenu a:hover {
    color: var(--color-primary);
    background-color: var(--color-accent-light);
    padding-left: 1.5rem;
}

/* ============================================================
   Мега-меню
   ============================================================ */

.seotigr-nav__item--mega-menu {
    position: static;
}

.seotigr-mega-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    width: min(900px, calc(100vw - 3rem));
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
    z-index: var(--z-dropdown);
    border-top: 3px solid var(--color-accent);
}

.seotigr-nav__item--mega-menu:hover .seotigr-mega-menu,
.seotigr-nav__item--mega-menu:focus-within .seotigr-mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.seotigr-mega-menu__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.seotigr-mega-menu__column-title {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.seotigr-mega-menu__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.seotigr-mega-menu__list a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0;
    font-size: 0.9rem;
    color: var(--color-text);
    transition: color var(--transition), gap var(--transition);
}

.seotigr-mega-menu__list a::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background-color: var(--color-accent);
    flex-shrink: 0;
    transition: transform var(--transition);
}

.seotigr-mega-menu__list a:hover {
    color: var(--color-primary);
}

.seotigr-mega-menu__list a:hover::before {
    transform: scale(1.5);
}

/* ============================================================
   CTA кнопка в хедері
   ============================================================ */

.seotigr-header__cta {
    flex-shrink: 0;
}

.seotigr-header__cta .seotigr-btn {
    padding: 0.625rem 1.5rem;
    font-size: 0.875rem;
}

/* ============================================================
   Кнопка-бургер (мобільна)
   ============================================================ */

.seotigr-header__burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 8px;
    gap: 5px;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition);
}

.seotigr-header__burger:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.seotigr-header__burger span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-white);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
    transform-origin: center;
}

/* Стан відкритого меню */
.seotigr-header__burger.is-active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.seotigr-header__burger.is-active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.seotigr-header__burger.is-active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   Мобільне меню (overlay)
   ============================================================ */

.seotigr-mobile-menu {
    display: none;
    position: fixed;
    inset: 0;
    z-index: calc(var(--z-sticky) - 1);
    background-color: var(--color-primary);
    padding: calc(var(--header-height) + 1rem) 1.5rem 2rem;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.seotigr-mobile-menu__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.seotigr-mobile-menu__list li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.seotigr-mobile-menu__list a {
    display: block;
    padding: 0.875rem 0;
    color: rgba(255, 255, 255, 0.88);
    font-size: 1.0625rem;
    font-weight: 500;
    transition: color var(--transition);
}

.seotigr-mobile-menu__list a:hover {
    color: var(--color-accent);
}

/* Аккордеон підменю в мобільному меню */
.seotigr-mobile-menu__toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.seotigr-mobile-menu__toggle::after {
    content: '+';
    font-size: 1.25rem;
    color: var(--color-accent);
    transition: transform var(--transition);
    flex-shrink: 0;
}

.seotigr-mobile-menu__toggle.is-open::after {
    transform: rotate(45deg);
}

.seotigr-mobile-submenu {
    padding-left: 1rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.seotigr-mobile-submenu.is-open {
    max-height: 600px;
}

/* ============================================================
   Нестандартний хедер Astra — перевизначення
   ============================================================ */

/* Відступ під хедер (компенсація fixed позиції) */
.page-with-fixed-header {
    padding-top: var(--header-height);
}

/* Прибираємо стандартний Astra хедер якщо використовуємо свій */
.ast-no-header .site-header {
    display: none;
}