/* ============================================================
   HEADER.CSS — Kobi Proje Danışmanlık
   ============================================================
   Sticky navigasyon çubuğu, masaüstü menü, mega menü,
   hamburger ikonu, mobil off-canvas panel, mobil akordiyon
   alt menü, "Hemen Ara" CTA butonu ve responsive kırılma
   noktaları stilleri.
   
   BEM isimlendirme kuralı tutarlı şekilde uygulanır.
   ============================================================ */

/* ============================================================
   1. STICKY HEADER — Şeffaf → Opak Geçiş
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition:
    background-color 300ms ease,
    box-shadow 300ms ease;
}

/* Anasayfada başlangıçta şeffaf */
.header--transparent {
  background-color: transparent;
}

/* Diğer sayfalarda veya scroll sonrası opak */
.header--opaque,
.header--scrolled {
  background-color: var(--color-bg-primary);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
}

/* ============================================================
   2. HEADER NAV CONTAINER
   ============================================================ */
.header__nav {
  width: 100%;
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: var(--space-md);
}

/* ============================================================
   3. LOGO
   ============================================================ */
.header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  z-index: 10;
}

.header__logo img {
  height: 42px;
  width: auto;
}

/* ============================================================
   4. MASAÜSTÜ MENÜ
   ============================================================ */
.header__menu {
  display: none;
  align-items: center;
  gap: var(--space-xs);
  margin: 0;
  padding: 0;
  list-style: none;
}

.header__menu-item {
  position: relative;
}

.header__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast);
}

/* Şeffaf header'da beyaz metin */
.header--transparent .header__link {
  color: #ffffff;
}

.header--transparent .header__link:hover,
.header--transparent .header__link--active {
  color: var(--color-secondary-light);
}

/* Opak header'da koyu metin */
.header--opaque .header__link,
.header--scrolled .header__link {
  color: var(--color-text-primary);
}

.header__link:hover,
.header__link--active {
  color: var(--color-primary);
}

/* Hover alt çizgi animasyonu — merkezden genişleyen */
.header__link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-secondary);
  transition: width var(--transition-base), left var(--transition-base);
}

.header__link:hover::after,
.header__link--active::after {
  width: calc(100% - 2 * var(--space-md));
  left: var(--space-md);
}

/* Chevron ikonu */
.header__chevron {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.header__menu-item--has-mega:hover .header__chevron,
.header__menu-item--has-mega .header__link[aria-expanded="true"] ~ .header__chevron {
  transform: rotate(180deg);
}


/* ============================================================
   5. MEGA MENÜ — Hizmetler Dropdown
   ============================================================ */
.header__mega-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 720px;
  background: #ffffff;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.04);
  border-top: 3px solid var(--color-secondary);
  padding: var(--space-xl) var(--space-2xl) var(--space-2xl);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(12px);
  transition:
    opacity 200ms ease,
    visibility 200ms ease,
    transform 200ms ease;
  pointer-events: none;
}

.header__mega-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.header__mega-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm) var(--space-lg);
  align-items: start;
}

.header__mega-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.6rem 0.8rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition:
    color 150ms ease,
    background-color 150ms ease,
    transform 150ms ease;
  line-height: 1.4;
}

.header__mega-link::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-border);
  flex-shrink: 0;
  transition: background 150ms ease, transform 150ms ease;
}

.header__mega-link:hover {
  color: var(--color-primary);
  background-color: rgba(26, 42, 94, 0.05);
  transform: translateX(2px);
}

.header__mega-link:hover::before {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  transform: scale(1.3);
}

/* ============================================================
   5b. MEGA MENÜ — 2. SEVİYE GRUPLAR
   ============================================================ */

/* Her mega öğe */
.mega-item {
  min-width: 0;
}

/* Tüm mega linklerin temel stili — parent ve child aynı */
.mega-item__link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0.5rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: 6px;
  transition: color 150ms ease, background-color 150ms ease;
  line-height: 1.4;
}

.mega-item__link::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-border);
  flex-shrink: 0;
  transition: background 150ms ease;
}

.mega-item__link:hover {
  color: var(--color-primary);
  background-color: rgba(26, 42, 94, 0.05);
}

.mega-item__link:hover::before {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

/* Parent — altında alt menü var, ok göster */
.mega-item--parent .mega-item__link {
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
}

.mega-item--parent .mega-item__link::before {
  background: var(--color-primary);
}

.mega-item--parent .mega-item__link::after {
  content: '';
  width: 5px;
  height: 5px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  margin-left: auto;
  opacity: 0.5;
  transition: transform 200ms ease, opacity 200ms ease;
  flex-shrink: 0;
}

.mega-item--parent:hover .mega-item__link::after {
  transform: rotate(45deg) translate(1px, 1px);
  opacity: 1;
}

/* 2. seviye alt liste — varsayılan gizli, hover ile açılır */
.mega-sub-list {
  list-style: none;
  padding: 0;
  margin: 0 0 0 1.2rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 250ms ease, opacity 200ms ease;
  opacity: 0;
}

.mega-item--parent:hover > .mega-sub-list {
  max-height: 500px;
  opacity: 1;
}

.mega-sub-list li {
  margin: 0;
}

.mega-sub-link {
  display: block;
  padding: 0.3rem 0.8rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  border-radius: 4px;
  transition: color 150ms ease, background-color 150ms ease;
  line-height: 1.5;
}

.mega-sub-link:hover {
  color: var(--color-primary);
  background-color: rgba(26, 42, 94, 0.05);
}

/* ============================================================
   6. HAMBURGER İKONU — Animasyonlu X Dönüşümü
   ============================================================ */
.header__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1010;
  gap: 5px;
}

.header__hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition:
    transform 300ms ease,
    opacity 200ms ease,
    background-color var(--transition-fast);
}

/* Şeffaf header'da beyaz çizgiler */
.header--transparent .header__hamburger-line {
  background-color: #ffffff;
}

.header--opaque .header__hamburger-line,
.header--scrolled .header__hamburger-line {
  background-color: var(--color-text-primary);
}

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

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

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

/* ============================================================
   7. MOBİL OFF-CANVAS PANEL
   ============================================================ */
.header__mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1005;
  pointer-events: none;
}

.header__mobile-menu.is-open {
  pointer-events: auto;
}

/* Overlay arka plan */
.header__mobile-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity 300ms ease;
}

.header__mobile-menu.is-open .header__mobile-overlay {
  opacity: 1;
}

/* Panel — sağdan kayarak açılır */
.header__mobile-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 320px;
  max-width: 85vw;
  height: 100%;
  background-color: var(--color-bg-primary);
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.15);
  transform: translateX(100%);
  transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-xl) var(--space-lg);
  padding-top: 80px;
}

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

/* Mobil panel kapatma butonu */
.header__mobile-close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

/* ============================================================
   8. MOBİL MENÜ LİSTESİ
   ============================================================ */
.header__mobile-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.header__mobile-item {
  border-bottom: 1px solid var(--color-border);
}

.header__mobile-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) 0;
  font-family: var(--font-heading);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
}

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

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

/* Mobil chevron */
.header__mobile-chevron {
  width: 18px;
  height: 18px;
  color: var(--color-text-light);
  transition: transform 300ms ease;
  flex-shrink: 0;
}

.header__mobile-item--open .header__mobile-chevron {
  transform: rotate(180deg);
}


/* ============================================================
   9. MOBİL AKORDİYON ALT MENÜ — Hizmetler
   ============================================================ */
.header__mobile-submenu {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 300ms ease;
}

.header__mobile-item--open .header__mobile-submenu {
  max-height: 800px;
}

.header__mobile-sublink {
  display: block;
  padding: var(--space-sm) 0 var(--space-sm) var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.header__mobile-sublink:hover {
  color: var(--color-primary);
  padding-left: calc(var(--space-lg) + 4px);
}

/* ============================================================
   10. "HEMEN ARA" CTA BUTONU
   ============================================================ */
.header__cta {
  display: none;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
  z-index: 10;
}

.header__phone-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.header__cta-text {
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
}

/* Şeffaf header'da beyaz CTA */
.header--transparent .header__cta {
  border-color: rgba(255, 255, 255, 0.6);
  color: #ffffff;
}

.header--transparent .header__cta:hover {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: #ffffff;
  color: #ffffff;
}

/* Mobil: sadece ikon */
.header__cta--mobile {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-full);
  color: var(--color-primary);
  z-index: 10;
}

.header--transparent .header__cta--mobile {
  color: #ffffff;
}

.header--opaque .header__cta--mobile,
.header--scrolled .header__cta--mobile {
  color: var(--color-primary);
}

.header__cta--mobile .header__cta-text {
  display: none;
}

/* ============================================================
   11. RESPONSIVE KIRILMA NOKTALARI
   ============================================================ */

/* 992px+ — Masaüstü */
@media (min-width: 992px) {
  .header__menu {
    display: flex;
  }

  .header__hamburger {
    display: none;
  }

  .header__cta--mobile {
    display: none;
  }

  .header__cta {
    display: inline-flex;
  }

  .header__container {
    height: 80px;
  }

  .header__logo img {
    height: 48px;
  }
}

/* 768px–991px — Tablet */
@media (max-width: 991px) {
  .header__mega-menu {
    display: none;
  }
}

/* 576px altı — Küçük mobil */
@media (max-width: 575px) {
  .header__mobile-panel {
    width: 100%;
    max-width: 100vw;
  }

  .header__container {
    height: 64px;
  }

  .header__logo img {
    height: 36px;
  }
}

/* ============================================================
   12. MOBİL PANEL CTA
   ============================================================ */
.header__mobile-cta {
  margin-top: var(--space-xl);
}

.header__mobile-cta-btn {
  width: 100%;
  justify-content: center;
}

/* ============================================================
   13. BODY SCROLL LOCK
   ============================================================ */
body.menu-open {
  overflow: hidden;
}