/**
 * Header — Sticky Navigation, Logo, Hamburger, Mobile-Nav
 */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.site-header.is-transparent { background: transparent; }
.site-header.is-solid {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--nwa-border), var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  position: relative;
  height: 44px;
  width: 176px;
  flex-shrink: 0;
}
.logo-img {
  height: 44px;
  width: auto;
  display: block;
  position: absolute;
  left: 0; top: 0;
  transition: opacity var(--dur) var(--ease);
}
.logo-img--dark  { opacity: 1; }
.logo-img--light { opacity: 0; }

.is-transparent .logo-img--dark  { opacity: 0; }
.is-transparent .logo-img--light { opacity: 1; }

/* Desktop-Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: nowrap;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: var(--fs-sm);
  font-weight: 600;
  white-space: nowrap;
  color: rgba(255, 255, 255, 0.92);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0.8rem; right: 0.8rem;
  height: 2px;
  background: var(--nwa-cyan-400);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform var(--dur) var(--ease);
}
.nav-link:hover::after,
.nav-link.active::after { transform: scaleX(1); }
.nav-link:hover,
.nav-link.active { color: #fff; }

.is-solid .nav-link { color: var(--nwa-text-700); }
.is-solid .nav-link:hover {
  color: var(--nwa-blue-900);
  background: var(--nwa-blue-50);
}
.is-solid .nav-link::after { background: var(--nwa-blue-700); }

.nav-link-icon {
  width: 13px; height: 13px;
  opacity: 0.7;
  flex-shrink: 0;
}

/* Browser-Reset für <button>-Variante des Login/Logout-Links */
button.btn-login {
  background: transparent;
  font-family: inherit;
  cursor: pointer;
}

/* Login/Logout-Button im Header */
.btn-login {
  margin-left: var(--space-sm);
  padding: 0.45rem 1.1rem;
  border: 1.5px solid rgba(255, 255, 255, 0.55);
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm);
  font-weight: 600;
  white-space: nowrap;
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.btn-login:hover { border-color: #fff; background: rgba(255, 255, 255, 0.1); }
.btn-login::after { display: none !important; }
.is-solid .btn-login {
  border-color: var(--nwa-blue-200);
  color: var(--nwa-text-700) !important;
}
.is-solid .btn-login:hover {
  border-color: var(--nwa-blue-700);
  background: var(--nwa-blue-50);
  color: var(--nwa-blue-900) !important;
}
.mobile-nav .nav-link.btn-login {
  display: block;
  text-align: center;
  padding: 0.6rem 1.1rem;
  margin-top: var(--space-md);
  font-size: var(--fs-sm);
  border: 1.5px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--radius-pill);
}

/* Dashboard-CTA im Header */
.header-cta {
  margin-left: var(--space-sm);
  padding: 0.5rem 1.2rem;
  background: var(--nwa-cyan-500);
  color: #fff !important;
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm);
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.35);
  transition: background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.header-cta:hover { background: var(--nwa-cyan-600); transform: translateY(-1px); }
.header-cta::after { display: none !important; }

/* Hamburger */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px; height: 40px;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.menu-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.is-solid .menu-toggle span { background: var(--nwa-blue-900); }

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

/* Mobile-Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-h); left: 0; right: 0;
  background: rgba(13, 27, 42, 0.98);
  backdrop-filter: blur(20px);
  padding: var(--space-lg) var(--space-xl) var(--space-2xl);
  z-index: 99;
  transform: translateY(-10px);
  opacity: 0;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
  pointer-events: none;
}
.mobile-nav.is-open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}
.mobile-nav .nav-link {
  display: flex;
  padding: 0.85rem 0;
  font-size: var(--fs-lg);
  color: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.mobile-nav .nav-link::after { display: none; }
.mobile-nav .header-cta {
  display: block;
  text-align: center;
  margin-top: var(--space-lg);
}

@media (max-width: 1024px) {
  .main-nav .nav-link:not(.header-cta) { display: none; }
  .header-cta { margin-left: auto; }
  .menu-toggle { display: flex; }
  .mobile-nav  { display: block; }
}