/* =============================================================================
   NAVIGATION – Desktop & Mobile
   Logo oben links (Markenhandbuch S. 9), saubere Hauptnavigation
   ============================================================================= */

/* --- Logo / Siegel ---
 *
 * Branding-Hierarchie:
 *   [Siegel]  UNIVERSITÄT ZU KÖLN          ← .site-logo__uni
 *             Zentrum für Lehrer*innenb.   ← .site-logo__einrichtung
 *             Formulardienst               ← .site-logo__service
 *
 * Markenhandbuch S. 9: Logo oben links, feste Position.
 * --------------------------------------------------- */
.site-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
  gap: var(--space-3);
  min-width: 0;
}

.site-logo:hover {
  text-decoration: none;
}

/* Siegel-Bildmarke */
.site-logo__siegel {
  height: 48px;
  width: auto;
  max-width: none;
  flex-shrink: 0;
  display: block;
  object-fit: contain;
}


/* Wortmarke-Container */
.site-logo__wordmark {
  display: flex;
  flex-direction: column;
  gap: 0;
  min-width: 0;
  /* Trennlinie links vom Siegel */
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-sand-300);
}

/* Zeile 1: Universität zu Köln */
.site-logo__uni {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gray-400);
  white-space: nowrap;
  line-height: 1.3;
}

/* Zeile 2: Einrichtung */
.site-logo__einrichtung {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-uni-blau);
  white-space: nowrap;
  line-height: 1.25;
}

/* Zeile 3: Service / Anwendungsname */
.site-logo__service {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-tuerkis);
  white-space: nowrap;
  line-height: 1.3;
}

/* --- Haupt-Navigation --- */
.primary-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.primary-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0;
}

.primary-nav li {
  position: relative;
  margin: 0;
}

.primary-nav > ul > li > a,
.primary-nav > ul > li > span {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-gray-700);
  text-decoration: none;
  border-radius: var(--border-radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  white-space: nowrap;
  position: relative;
}

.primary-nav > ul > li > a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-4);
  right: var(--space-4);
  height: 2px;
  background-color: var(--color-tuerkis);
  border-radius: var(--border-radius-full);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.primary-nav > ul > li > a:hover,
.primary-nav > ul > li.is-active > a {
  color: var(--color-uni-blau);
  background-color: var(--color-sand-50);
}

.primary-nav > ul > li > a:hover::after,
.primary-nav > ul > li.is-active > a::after {
  transform: scaleX(1);
}

/* --- Dropdown-Menü --- */
.primary-nav .menu__item--has-children {
  position: relative;
}

.primary-nav .menu__item--has-children > a::before {
  content: '▾';
  margin-left: var(--space-2);
  font-size: 0.65em;
  transition: transform var(--transition-fast);
}

.primary-nav .menu__item--has-children:hover > a::before,
.primary-nav .menu__item--has-children:focus-within > a::before {
  transform: rotate(180deg);
}

.primary-nav .menu {
  display: none;
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  min-width: 220px;
  background-color: var(--color-white);
  border: 1px solid var(--color-sand-200);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  z-index: 200;
  animation: dropdown-in var(--transition-base) ease;
}

.primary-nav .menu__item--has-children:hover .menu,
.primary-nav .menu__item--has-children:focus-within .menu {
  display: block;
}

.primary-nav .menu a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-family: var(--font-sans);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-gray-700);
  text-decoration: none;
  border-radius: var(--border-radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.primary-nav .menu a:hover {
  background-color: var(--color-sand-50);
  color: var(--color-uni-blau);
}

@keyframes dropdown-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Header-Aktionen (Suche, Sprache) --- */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: var(--space-4);
}

.header-search-btn,
.header-lang-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-full);
  background: transparent;
  border: 1px solid var(--color-sand-200);
  color: var(--color-gray-700);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
}

.header-search-btn:hover,
.header-lang-btn:hover {
  background-color: var(--color-sand-50);
  border-color: var(--color-uni-blau);
  color: var(--color-uni-blau);
}

/* --- Mobile Navigation Toggle --- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background-color: var(--color-uni-blau);
  border-radius: var(--border-radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle.is-active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.nav-toggle.is-active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-toggle.is-active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* --- Mobile Navigation Overlay --- */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--header-height);
  background-color: var(--color-white);
  z-index: 90;
  overflow-y: auto;
  padding: var(--space-6);
  animation: slide-in var(--transition-base) ease;
}

.mobile-nav.is-open {
  display: block;
}

@keyframes slide-in {
  from { transform: translateX(-100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.mobile-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-nav li {
  margin: 0;
  border-bottom: 1px solid var(--color-sand-200);
}

.mobile-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-uni-blau);
  text-decoration: none;
}

.mobile-nav .menu {
  padding-left: var(--space-4);
}

.mobile-nav .menu li {
  border-color: var(--color-sand-100);
}

.mobile-nav .menu a {
  font-size: var(--font-size-sm);
  color: var(--color-gray-700);
  font-weight: var(--font-weight-medium);
}

/* --- Sekundäre Navigation (Utility Nav) --- */
.secondary-nav {
  font-size: var(--font-size-xs);
}

.secondary-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.secondary-nav a {
  color: var(--color-gray-500);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-sans);
}

.secondary-nav a:hover {
  color: var(--color-tuerkis);
}

/* --- Footer Navigation --- */
.footer-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--color-tuerkis);
}

.footer-nav__title {
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-4);
}