/* =========================================
   PPF Portal — Header
   ========================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-fast);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

/* Inner layout */
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: var(--space-8);
}

/* Logo */
.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  text-decoration: none;
}

.logo-icon {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-text {
  font-size: var(--text-lg);
  font-weight: var(--fw-extrabold);
  letter-spacing: -0.03em;
  line-height: 1;
}

.logo-eniyi {
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
}

.logo-ppf {
  color: var(--color-primary);
  font-weight: var(--fw-extrabold);
}

.logo-kaplama {
  color: var(--color-text);
  font-weight: var(--fw-semibold);
}

/* Desktop nav */
.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-2);
  font-size: 0.8125rem;
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  white-space: nowrap;
  transition: color var(--transition-fast);
}

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

.nav-link.active {
  color: var(--color-primary);
  font-weight: var(--fw-semibold);
}

.nav-link--hot {
  color: var(--color-text);
  font-weight: var(--fw-semibold);
}


/* Header actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.header-cta {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
  background: none;
  border: none;
}

.ham-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  transform-origin: center;
}

.hamburger[aria-expanded="true"] .ham-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger[aria-expanded="true"] .ham-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger[aria-expanded="true"] .ham-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  padding: var(--space-3) 0;
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--transition-base);
}

.mobile-menu.open {
  max-height: 320px;
}

.mobile-nav-link {
  display: block;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.mobile-nav-link:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.mobile-nav-cta {
  color: var(--color-primary);
  font-weight: var(--fw-semibold);
}

/* Mobil SEO linkleri */
.mobile-nav-link--seo {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text);
  font-weight: var(--fw-semibold);
}

.mobile-nav-badge {
  font-size: var(--text-xs);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  background: var(--color-primary-light);
  border: 1px solid rgba(26, 86, 219, 0.2);
  border-radius: var(--radius-full);
  padding: 1px 8px;
  letter-spacing: 0.04em;
}

/* Responsive */
@media (max-width: 768px) {
  .header-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }

  .header-cta {
    display: none;
  }
}