/* ===== Header ===== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.85rem 4rem;

  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.site-logo img {
  display: block;
  height: 48px;
  width: auto;
}

.main-nav__list {
  display: flex;
  align-items: center;
  gap: 2rem;

  margin: 0;
  padding: 0;
  list-style: none;
}

.main-nav a {
  position: relative;

  text-decoration: none;
  color: #111;
  font-weight: 600;
  font-size: 1.1rem;

  padding-bottom: 0.45rem;

  transition: color 0.3s ease;
}

.main-nav a::after {
  content: "";

  position: absolute;
  left: 0;
  bottom: 0;

  width: 100%;
  height: 4px;

  border-radius: 999px;
  background: #f57d00;

  transform: scaleX(0);
  transform-origin: left center;

  transition: transform 0.3s ease;
}

.main-nav a:hover {
  color: #111;
}

.main-nav a:hover::after {
  transform: scaleX(1);
}

/* aktive Seite */

.main-nav a.active::after {
  transform: scaleX(1);
}

.main-nav a.active {
  color: #111;
}

/* ===== Mega Menu Desktop ===== */

.has-mega {
  position: static;
}

.mega-menu {
  position: absolute;
  left: 4rem;
  right: 4rem;
  top: 100%;

  opacity: 0;
  visibility: hidden;
  pointer-events: none;

  padding-top: 0.75rem;
  transition: opacity 0.25s ease;
}

.has-mega.is-open .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mega-menu__inner {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;

  padding: 1.25rem;
  border-radius: 18px;

  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.14);
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.mega-menu__inner a {
  display: block;
  padding: 0.75rem 0.85rem;
  border-radius: 10px;

  color: #222;
  background: rgba(0, 0, 0, 0.03);
  font-weight: 500;
}

.mega-menu__inner a:hover {
  background: rgba(0, 0, 0, 0.08);
  color: #000;
}

/* ===== Hamburger ===== */

.nav-toggle {
  display: none;
  width: 54px;
  height: 36px;
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 34px;
  height: 3px;
  margin: 6px auto;
  background: #f57d00;
  border-radius: 999px;
  transition:
    transform 0.25s ease,
    opacity 0.25s ease;
}

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

@media (max-width: 900px) {
  .header-container {
    padding: 0.85rem 1.5rem;
    flex-wrap: wrap;
  }

  .site-logo img {
    height: 42px;
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    width: 100%;
  }

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

  .main-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem 0 0;
  }

  .main-nav__list > li > a {
    display: block;
    padding: 0.9rem 0;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
  }

  .mega-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    padding: 0 0 1rem;
  }

  .mega-menu__inner {
    grid-template-columns: 1fr;
    box-shadow: none;
    border-radius: 12px;
    padding: 0.75rem;
  }

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

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

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

@media (max-width: 900px) {
  .site-header {
    max-height: 100dvh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .main-nav.is-open {
    display: block;
    max-height: calc(100dvh - 80px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding-bottom: 4rem;
  }
}