/* ==========================================================================
   Navigation — "Midnight Aurora" Design System
   Header, Mega Menu, Mobile Nav
   ========================================================================== */

/* ==========================================================================
   Header — Clean, precise, with glassmorphism on scroll
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: transparent;
  z-index: var(--z-header);
  transition:
    height var(--transition-base),
    background-color var(--transition-base),
    box-shadow var(--transition-base),
    backdrop-filter var(--transition-base);
}

.header.scrolled {
  height: var(--header-height-scrolled);
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  box-shadow: 0 1px 0 rgba(12, 27, 51, 0.04), 0 4px 16px rgba(12, 27, 51, 0.03);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Logo
   ========================================================================== */

.header__logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: 1.35rem;
  color: var(--text-on-dark);
  text-decoration: none;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.header.scrolled .header__logo {
  color: var(--color-primary);
}

.header__logo:hover {
  opacity: 0.85;
}

.header__logo img,
.header__logo svg {
  height: 36px;
  width: auto;
}

.header__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.header__logo-text span {
  font-size: var(--text-xs);
  font-weight: var(--fw-medium);
  color: var(--text-on-dark-muted);
  letter-spacing: 0.02em;
}

.header.scrolled .header__logo-text span {
  color: var(--text-tertiary);
}

/* Desktop Navigation
   ========================================================================== */

.header__nav {
  display: flex;
  align-items: center;
  gap: 0;
  height: 100%;
}

.header__nav-item {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.header__nav-link {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  transition: color var(--transition-fast);
  white-space: nowrap;
  height: 100%;
}

.header.scrolled .header__nav-link {
  color: var(--text-primary);
}

.header__nav-link:hover {
  color: var(--text-on-dark);
}

.header.scrolled .header__nav-link:hover {
  color: var(--color-accent);
}

.header__nav-link.is-active {
  color: var(--text-on-dark);
}

.header.scrolled .header__nav-link.is-active {
  color: var(--color-accent);
}

/* Active indicator */
.header__nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-base);
}

.header__nav-link:hover::before,
.header__nav-link.is-active::before,
.header__nav-item.is-open .header__nav-link::before {
  transform: scaleX(1);
}

/* Chevron */
.header__nav-link.has-dropdown {
  cursor: pointer;
}

.header__nav-link.has-dropdown::after {
  content: '';
  display: inline-block;
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='rgba(255,255,255,0.6)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m4 6 4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 16px;
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.header.scrolled .header__nav-link.has-dropdown::after {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m4 6 4 4 4-4'/%3E%3C/svg%3E");
}

.header__nav-item.is-open .header__nav-link.has-dropdown::after {
  transform: rotate(180deg);
}

.header__nav-item.is-open .header__nav-link.has-dropdown {
  color: var(--color-accent);
}

/* CTA Button */
.header__cta {
  margin-left: var(--space-md);
}

.header__cta .btn-primary {
  padding: 0.5rem 1.25rem;
  font-size: var(--text-xs);
}

/* ==========================================================================
   Mega Menu Panels
   ========================================================================== */

.mega-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100vw;
  background-color: var(--bg-primary);
  box-shadow: var(--mega-menu-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition:
    opacity 250ms ease-out,
    visibility 250ms ease-out,
    transform 250ms ease-out;
  z-index: var(--z-mega-menu);
  border-top: 1px solid var(--border);
}

.header__nav-item .mega-menu {
  transform: translateY(-10px);
  /* left wird per JS gesetzt */
}

.header__nav-item.is-open .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega-menu--full {
  right: 0;
  transform: translateY(-10px) !important;
  /* left wird per JS berechnet, um den Viewport-Rand zu treffen */
}

.header__nav-item.is-open .mega-menu--full {
  transform: translateY(0) !important;
}

/* Inner container */
.mega-menu__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg);
  display: grid;
}

/* Layout Variants */
.mega-menu--products .mega-menu__inner {
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  padding: var(--space-lg) var(--space-lg) 0;
}

.mega-menu--services .mega-menu__inner {
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  max-width: 700px;
}

.mega-menu--company .mega-menu__inner {
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  max-width: 650px;
}

/* Column */
.mega-menu__column {
  padding: var(--space-xs) 0;
}

/* Category Header */
.mega-menu__category {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
  color: var(--text-tertiary);
  margin-bottom: var(--space-sm);
  padding: 0 0.75rem;
}

.mega-menu__category svg {
  width: 16px;
  height: 16px;
  opacity: 0.5;
}

/* Menu Links */
.mega-menu__link {
  display: flex;
  flex-direction: column;
  padding: 0.625rem 0.75rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background-color var(--transition-fast);
}

.mega-menu__link:hover {
  background-color: var(--bg-secondary);
}

.mega-menu__link-title {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  color: var(--text-primary);
  line-height: 1.3;
  transition: color var(--transition-fast);
}

.mega-menu__link:hover .mega-menu__link-title {
  color: var(--color-accent);
}

.mega-menu__link-desc {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  margin-top: 0.125rem;
  line-height: 1.4;
}

/* Highlight Box */
.mega-menu__highlight {
  background: linear-gradient(135deg, var(--color-accent-light) 0%, rgba(6, 214, 160, 0.04) 100%);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  min-height: 200px;
  border: 1px solid rgba(59, 130, 246, 0.08);
}

.mega-menu__highlight-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: var(--text-on-dark);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mega-menu__highlight-icon svg {
  width: 24px;
  height: 24px;
}

.mega-menu__highlight-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: var(--fw-bold);
  color: var(--text-primary);
}

.mega-menu__highlight-text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Footer */
.mega-menu__footer {
  grid-column: 1 / -1;
  border-top: 1px solid var(--border);
  padding: var(--space-md) var(--space-lg);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  background-color: var(--bg-secondary);
  margin: var(--space-lg) calc(-1 * var(--space-lg)) 0;
  margin-bottom: calc(-1 * var(--space-lg));
  padding-bottom: var(--space-lg);
}

.mega-menu__footer-text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.mega-menu__footer-text strong {
  color: var(--text-primary);
  font-weight: var(--fw-semibold);
}

/* ==========================================================================
   Overlay
   ========================================================================== */

.mega-menu-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(12, 27, 51, 0.2);
  z-index: calc(var(--z-header) - 1);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--transition-base),
    visibility var(--transition-base);
}

.mega-menu-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================================
   Mobile Toggle (Hamburger)
   ========================================================================== */

.mobile-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.header.scrolled .mobile-toggle:hover {
  background-color: var(--bg-secondary);
}

.mobile-toggle__icon {
  position: relative;
  width: 24px;
  height: 18px;
}

.mobile-toggle__line {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--text-on-dark);
  border-radius: 2px;
  transition:
    transform var(--transition-base),
    opacity var(--transition-fast);
}

.header.scrolled .mobile-toggle__line {
  background-color: var(--text-primary);
}

.mobile-toggle__line:nth-child(1) { top: 0; }
.mobile-toggle__line:nth-child(2) { top: 8px; }
.mobile-toggle__line:nth-child(3) { top: 16px; }

.mobile-toggle.is-open .mobile-toggle__line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.mobile-toggle.is-open .mobile-toggle__line:nth-child(2) {
  opacity: 0;
}
.mobile-toggle.is-open .mobile-toggle__line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ==========================================================================
   Mobile Navigation
   ========================================================================== */

.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 400px;
  height: 100vh;
  height: 100dvh;
  background-color: var(--bg-primary);
  transform: translateX(100%);
  transition: transform 350ms cubic-bezier(0.4, 0, 0.2, 1);
  z-index: var(--z-modal);
  overflow-y: auto;
  overscroll-behavior: contain;
  box-shadow: -8px 0 30px rgba(12, 27, 51, 0.1);
}

.mobile-nav.is-open {
  transform: translateX(0);
}

.mobile-nav__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background-color: var(--bg-primary);
  z-index: 1;
}

.mobile-nav__header .header__logo {
  color: var(--color-primary);
}

.mobile-nav__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-nav__close:hover {
  background-color: var(--bg-secondary);
}

.mobile-nav__close svg {
  width: 24px;
  height: 24px;
  color: var(--text-primary);
}

.mobile-nav__body {
  padding: var(--space-sm) 0;
}

.mobile-nav__item {
  border-bottom: 1px solid var(--border);
}

.mobile-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--fw-medium);
  color: var(--text-primary);
  text-decoration: none;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast);
}

.mobile-nav__link:hover {
  background-color: var(--bg-secondary);
}

.mobile-nav__link.is-active {
  color: var(--color-accent);
}

.mobile-nav__link.has-children::after {
  content: '';
  display: block;
  width: 20px;
  height: 20px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M5 8.333 10 13.333l5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.mobile-nav__item.is-open > .mobile-nav__link.has-children::after {
  transform: rotate(180deg);
}

.mobile-nav__item.is-open > .mobile-nav__link {
  color: var(--color-accent);
}

.mobile-nav__submenu {
  display: none;
  padding-left: var(--space-lg);
  padding-bottom: var(--space-sm);
  background-color: var(--bg-secondary);
}

.mobile-nav__item.is-open > .mobile-nav__submenu {
  display: block;
}

.mobile-nav__subcategory {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
  color: var(--text-tertiary);
  padding: var(--space-sm) var(--space-sm) 0.375rem;
}

.mobile-nav__sublink {
  display: block;
  padding: 0.5rem var(--space-sm);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

.mobile-nav__sublink:hover {
  color: var(--color-accent);
}

.mobile-nav__cta {
  padding: var(--space-lg);
  border-top: 1px solid var(--border);
}

.mobile-nav__cta .btn {
  width: 100%;
  justify-content: center;
}

.mobile-nav__contact {
  padding: var(--space-sm) var(--space-lg) var(--space-lg);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.mobile-nav__contact p {
  margin-bottom: 0.5rem;
  font-size: var(--text-sm);
}

.mobile-nav__contact a {
  color: var(--color-accent);
  font-weight: var(--fw-medium);
}

/* ==========================================================================
   Body Lock
   ========================================================================== */

body.nav-open {
  overflow: hidden;
}