/* ==========================================
   CSS VARIABLES (Z-INDEX MANAGEMENT)
   ========================================== */

:root {
  --z-canvas: -1;
  --z-content: 1;
  --z-sticky: 90;
  --z-mobile-nav: 998;
  --z-header: 999;
  --z-modal: 1000;
  
  /* Navigation Colors - OPTIMIERT */
  --nav-bg-primary: rgba(40, 44, 52, 0.98);
  --nav-bg-secondary: rgba(33, 37, 43, 1);
  --nav-border: rgba(255, 255, 255, 0.1);
  --nav-text: #ffffff;
  --nav-text-hover: #00d9ff; /* Helleres Cyan */
  --nav-mobile-bg: rgba(40, 44, 52, 0.98);
  
  /* Active State - Invertiert mit Cyan-Gradient */
  --nav-active-bg: linear-gradient(135deg, #00d9ff 0%, #00b8d4 100%);
  --nav-active-text: #0a1929; /* Dunkelblau, fast schwarz */
  --nav-active-shadow: 0 2px 12px rgba(0, 217, 255, 0.4);
  
  /* Hover State - Subtiler */
  --nav-hover-bg: rgba(0, 217, 255, 0.12);
  --nav-hover-border: rgba(0, 217, 255, 0.3);
  
  /* Timing */
  --nav-transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================
   NAVIGATION HEADER (FIXED)
   ========================================== */

.main-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: linear-gradient(135deg, 
    var(--nav-bg-primary) 0%, 
    var(--nav-bg-secondary) 100%);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--nav-border);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.main-header.hidden {
  transform: translateY(-100%);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

/* ==========================================
   LOGO
   ========================================== */

.logo {
  display: block;
  line-height: 0;
  z-index: 1;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.logo img {
  height: 40px;
  width: auto;
  display: block;
  transition: filter 0.3s ease, transform 0.3s ease;
}

.logo:hover {
  transform: scale(1.05);
}

.logo:hover img {
  filter: brightness(1.2) drop-shadow(0 0 8px rgba(0, 217, 255, 0.6));
}

@media (max-width: 768px) {
  .logo img {
    height: 36px;
  }
}

@media (max-width: 480px) {
  .logo img {
    height: 32px;
  }
}

/* ==========================================
   DESKTOP NAVIGATION
   ========================================== */

.desktop-nav {
  display: none; /* Startet versteckt (Mobile First) */
}

.desktop-nav ul {
  display: flex;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.desktop-nav a {
  display: block;
  padding: 0.75rem 1.25rem;
  color: var(--nav-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: 8px;
  transition: all 0.3s ease;
  position: relative;
  border: 1px solid transparent;
}

/* Hover State - Subtil */
.desktop-nav a:hover {
  color: var(--nav-text-hover);
  background: var(--nav-hover-bg);
  border-color: var(--nav-hover-border);
  transform: translateY(-1px);
}

/* Active State - INVERTIERT mit Cyan-Gradient */
.desktop-nav a.active {
  background: var(--nav-active-bg);
  color: var(--nav-active-text);
  font-weight: 600;
  box-shadow: var(--nav-active-shadow);
  border-color: transparent;
}

.desktop-nav a.active:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 217, 255, 0.5);
}

/* ==========================================
   BURGER MENU BUTTON - MIT CSS X
   ========================================== */

.burger-container {
  display: block;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1001;
  transition: transform 0.3s ease;
  width: 50px;
  height: 50px;
  color: #ffffff;
  position: relative; /* ← Wichtig für ::before/::after */
}

.burger-container:hover {
  transform: scale(1.1);
  color: #00d9ff;
}

.burger-container:active {
  transform: scale(0.95);
}

/* SVG Icon Styles */
.burger-container svg {
  width: 100%;
  height: 100%;
  display: block;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Active State - SVG ausblenden */
.burger-container.active svg {
  opacity: 0;
  transform: scale(0.8);
}

.burger-container.active {
  color: #00d9ff;
}

.burger-container.active:hover {
  color: #00ffcc;
}

/* CSS X-Icon für Active State */
.burger-container::before,
.burger-container::after {
  content: '';
  position: absolute;
  width: 28px;
  height: 3px;
  background: currentColor;
  top: 50%;
  left: 50%;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 2px;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.8);
}

.burger-container.active::before {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(45deg) scale(1);
}

.burger-container.active::after {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(-45deg) scale(1);
}

/* Hover-Effekt auf das X */
.burger-container.active:hover::before,
.burger-container.active:hover::after {
  width: 32px;
}

/* ==========================================
   MOBILE NAVIGATION
   ========================================== */

.mobile-nav {
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-mobile-nav);
  background: var(--nav-mobile-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  
  transition: all var(--nav-transition);
  overflow-y: auto;
  
  will-change: transform, opacity;
}

.mobile-nav.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-nav ul {
  list-style: none;
  padding: 2rem 2rem 4rem;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-nav li {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.mobile-nav.active li {
  opacity: 1;
  transform: translateX(0);
}

.mobile-nav.active li:nth-child(1) { transition-delay: 0.05s; }
.mobile-nav.active li:nth-child(2) { transition-delay: 0.1s; }
.mobile-nav.active li:nth-child(3) { transition-delay: 0.15s; }
.mobile-nav.active li:nth-child(4) { transition-delay: 0.2s; }
.mobile-nav.active li:nth-child(5) { transition-delay: 0.25s; }
.mobile-nav.active li:nth-child(6) { transition-delay: 0.3s; }
.mobile-nav.active li:nth-child(7) { transition-delay: 0.35s; }

.mobile-nav a {
  display: block;
  padding: 1rem 1.5rem;
  color: var(--nav-text);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 500;
  border-radius: 12px;
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

/* Hover State - Mobile */
.mobile-nav a:hover {
  background: var(--nav-hover-bg);
  color: var(--nav-text-hover);
  border-color: var(--nav-hover-border);
  transform: translateX(8px);
}

/* Active State - Mobile (INVERTIERT) */
.mobile-nav a.active {
  background: var(--nav-active-bg);
  color: var(--nav-active-text);
  font-weight: 600;
  box-shadow: var(--nav-active-shadow);
  border-color: transparent;
}

.mobile-nav a.active:hover {
  transform: translateX(12px);
  box-shadow: 0 4px 16px rgba(0, 217, 255, 0.5);
}

/* Body Lock beim offenen Menu */
body.mobile-nav-open {
  overflow: hidden;
}

/* ==========================================
   RESPONSIVE BREAKPOINTS
   ========================================== */

/* Tablet & Desktop: Desktop Nav anzeigen */
@media (min-width: 769px) {
  .desktop-nav {
    display: block; /* ← WICHTIG! */
  }
  
  .burger-container {
    display: none; /* Burger nur auf Mobile */
  }
  
  .mobile-nav {
    display: none; /* Mobile Nav verstecken */
  }
}

/* Tablet Optimierung */
@media (max-width: 1024px) and (min-width: 769px) {
  .desktop-nav a {
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
  }
}

/* Mobile Optimierung */
@media (max-width: 768px) {
  .header-inner {
    padding: 0.75rem 1rem;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0.5rem 1rem;
    gap: 1rem;
  }
  
  .mobile-nav ul {
    padding: 1.5rem 1rem 3rem;
  }
  
  .mobile-nav a {
    padding: 0.875rem 1rem;
    font-size: 1rem;
  }
}

/* ==========================================
   ACCESSIBILITY
   ========================================== */

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
  
  .mobile-nav li {
    transition-delay: 0s !important;
  }
}

@media (prefers-contrast: high) {
  .main-header {
    border-bottom: 2px solid var(--nav-text);
  }
  
  .desktop-nav a,
  .mobile-nav a {
    border: 2px solid transparent;
  }
  
  .desktop-nav a.active,
  .mobile-nav a.active {
    border: 2px solid #00d9ff;
  }
  
  .desktop-nav a:hover,
  .mobile-nav a:hover {
    border-color: var(--nav-text);
  }
}

/* ==========================================
   PRINT STYLES
   ========================================== */

@media print {
  .main-header {
    position: relative;
    background: white;
    border-bottom: 2px solid black;
  }
  
  .burger-container,
  .mobile-nav {
    display: none;
  }
  
  .desktop-nav {
    display: none;
  }
  
  .logo img {
    filter: grayscale(1);
  }
}