/* ============================================================
   KTA İnşaat — Header & Navigation Styles
   ============================================================ */

/* ── Header Base ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--header-h);
  background: transparent;
  transition: background 0.35s ease, height 0.3s ease, box-shadow 0.3s ease;
}

/* Scrolled state (JS adds .scrolled) */
.site-header.scrolled {
  height: var(--header-h); /* Keeping it 80px as requested */
  background: rgba(10, 22, 40, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06), var(--shadow-md);
}

/* On light-bg pages (JS adds .header-dark) */
.site-header.header-dark {
  background: rgba(10, 22, 40, 0.97);
}

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

/* ── Logo ── */
.header-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  height: 100%;
  width: 180px;
  /* Fixed width to prevent shifting */
  justify-content: flex-start;
  position: relative;
}

.logo-img {
  max-height: 80px;
  /* Increased size for better readability */
  width: auto;
  object-fit: contain;
  transition: opacity 0.4s ease, visibility 0.4s;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
}

.site-header.scrolled .logo-img {
  max-height: 80px;
  /* Maintain 80px size even in scrolled state */
}

/* Show light logo on transparent header, dark on scrolled */
.logo-dark {
  opacity: 0;
  visibility: hidden;
}

.logo-light {
  opacity: 1;
  visibility: visible;
}

.site-header.scrolled .logo-light {
  opacity: 0;
  visibility: hidden;
}

.site-header.scrolled .logo-dark {
  opacity: 1;
  visibility: visible;
}

/* ── Main Nav ── */
.main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.5rem 0.875rem;
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.88);
  border-radius: var(--radius);
  transition: var(--transition);
  white-space: nowrap;
  background: transparent;
}

.nav-link:hover,
.nav-link[aria-expanded="true"] {
  color: var(--gold);
  background: rgba(201, 168, 76, 0.08);
}

.nav-chevron {
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.nav-link[aria-expanded="true"] .nav-chevron {
  transform: rotate(180deg);
}

/* Active page indicator */
.nav-item.active>.nav-link {
  color: var(--gold);
}

/* ── Mega Menu ── */
.mega-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: var(--navy);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(201, 168, 76, 0.08);
  min-width: 480px;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  z-index: var(--z-sticky);
}

.mega-menu.open,
.nav-item.has-mega:hover .mega-menu,
.nav-item.has-mega:focus-within .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.mega-hizmetler {
  min-width: 640px;
}

.mega-inner {
  padding-inline: 0;
}

.mega-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-4);
}

.mega-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
}

.mega-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.mega-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius);
  transition: var(--transition);
  color: var(--text-light);
}

.mega-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--white);
}

.mega-item:hover .mega-title {
  color: var(--gold);
}

.mega-icon {
  font-size: 1.25rem;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: rgba(201, 168, 76, 0.08);
  border-radius: var(--radius);
  transition: background 0.2s ease;
}

.mega-item:hover .mega-icon {
  background: rgba(201, 168, 76, 0.15);
}

.mega-title {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--white);
  margin-bottom: 2px;
  transition: color 0.2s ease;
}

.mega-desc {
  display: block;
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Header Actions ── */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-left: auto;
}

.header-phone {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.75);
  white-space: nowrap;
  transition: color 0.2s ease;
}

.header-phone:hover {
  color: var(--gold);
}

@media (max-width: 1200px) {
  .header-phone {
    display: none;
  }
}

/* ── Hamburger ── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  padding: var(--space-2);
  transition: var(--transition);
}

.hamburger:hover {
  background: rgba(255, 255, 255, 0.08);
}

.ham-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--white);
  border-radius: var(--radius-full);
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

.hamburger[aria-expanded="true"] .ham-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

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

/* ── Mobile Nav Overlay ── */
.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 22, 40, 0.7);
  backdrop-filter: blur(4px);
  z-index: calc(var(--z-modal) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.mobile-nav-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

/* ── Mobile Nav Drawer ── */
.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(360px, 90vw);
  background: var(--navy);
  z-index: var(--z-modal);
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

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

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.mobile-close {
  color: var(--white);
  padding: var(--space-2);
  border-radius: var(--radius);
  transition: var(--transition);
}

.mobile-close:hover {
  background: rgba(255, 255, 255, 0.08);
}

.mobile-nav-list {
  flex: 1;
  padding: var(--space-4) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-nav-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius);
  transition: var(--transition);
}

.mobile-nav-link:hover {
  color: var(--gold);
  background: rgba(201, 168, 76, 0.08);
}

.mobile-nav-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius);
  transition: var(--transition);
}

.mobile-nav-toggle:hover {
  color: var(--gold);
  background: rgba(201, 168, 76, 0.08);
}

.mobile-nav-toggle svg {
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.mobile-nav-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.mobile-nav-toggle[aria-expanded="true"] {
  color: var(--gold);
}

.mobile-submenu {
  padding: var(--space-2) 0 var(--space-2) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-submenu a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: var(--transition);
}

.mobile-submenu a:hover {
  color: var(--gold);
  background: rgba(201, 168, 76, 0.06);
}

.mobile-nav-footer {
  padding: var(--space-4) var(--space-6) var(--space-8);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  flex-shrink: 0;
}

.mobile-phone-link {
  text-align: center;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--gold);
  padding: var(--space-3);
  border: 1px solid rgba(201, 168, 76, 0.25);
  border-radius: var(--radius);
  transition: var(--transition);
}

.mobile-phone-link:hover {
  background: rgba(201, 168, 76, 0.08);
}

/* ── Responsive: Show Hamburger ── */
@media (max-width: 1024px) {
  .main-nav {
    display: none;
  }

  .header-cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }
}

@media (max-width: 640px) {
  .header-inner {
    gap: var(--space-3);
  }
}