/* ==========================================================================
   DOĞTAP - Header & Navigation Stilleri
   ========================================================================== */

.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-fixed);
  transition: all var(--transition-normal);
  background: rgba(255, 255, 255, 0);
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.main-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-md);
  border-bottom: 1px solid var(--color-border-light);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--navbar-height);
  padding: 0 var(--space-4);
  max-width: var(--container-xl);
  margin: 0 auto;
  width: 100%;
}

/* Logo Stili */
.logo {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: var(--font-extrabold);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  z-index: calc(var(--z-fixed) + 1);
}

.logo img {
  height: 40px;
  width: auto;
}

.logo .text-gradient {
  background: linear-gradient(135deg, #fff 0%, #f0f0f0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: var(--transition-normal);
}

.main-header.scrolled .logo .text-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Navigasyon Listesi */
.nav-list {
  display: flex;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-list > li {
  position: relative;
}

.nav-list > li > a {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-weight: var(--font-medium);
  font-size: var(--text-base);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  color: white;
  text-shadow: 0 1px 3px rgba(0,0,0,0.5); /* Hero üstünde okunabilirlik */
}

.main-header.scrolled .nav-list > li > a {
  color: var(--color-primary);
  text-shadow: none;
}

.nav-list > li > a:hover,
.nav-list > li > a.active {
  color: var(--color-secondary);
}

.main-header.scrolled .nav-list > li > a:hover,
.main-header.scrolled .nav-list > li > a.active {
  background-color: var(--color-surface-hover);
  color: var(--color-primary-dark);
}

/* Açılır Menü (Dropdown) */
.has-dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--color-surface);
  min-width: 220px;
  box-shadow: var(--shadow-xl);
  border-radius: var(--radius-lg);
  padding: var(--space-2) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: var(--z-dropdown);
  border: 1px solid var(--color-border-light);
}

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

.dropdown-menu li {
  display: block;
}

.dropdown-menu a {
  display: block;
  padding: 12px 24px;
  color: var(--color-text);
  font-size: var(--text-sm);
  transition: var(--transition-fast);
}

.dropdown-menu a:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-primary);
  padding-left: 28px; /* Hover animasyonu */
}

/* Mobil Menü Butonu (Hamburger) */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: calc(var(--z-fixed) + 1);
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: white;
  border-radius: 3px;
  transition: all var(--transition-normal);
}

.main-header.scrolled .mobile-menu-toggle span {
  background-color: var(--color-primary);
}

/* Mobil Menü Açık Durumu Animasyonu */
.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}
.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* Responsive Tasarım */
@media (max-width: 992px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-list {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--color-surface);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-6);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: all var(--transition-normal);
    z-index: var(--z-fixed);
  }
  
  .nav-list.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .nav-list > li > a {
    color: var(--color-primary);
    text-shadow: none;
    font-size: var(--text-2xl);
  }
  
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    background: transparent;
    text-align: center;
    display: none;
  }
  
  .has-dropdown.active .dropdown-menu {
    display: block;
  }
  
  .main-header .mobile-menu-toggle.active span {
    background-color: var(--color-primary); /* Menü açıkken çarpı koyu olsun */
  }
}