:root {
  --header-height: 2.5rem;
  --nav-popover-default-height: 15rem;
  --nav-popover-max-height: calc(100dvh - var(--header-height));
  --nav-popover-header-height: 2rem;
}

#nav-panel { 
  --nav-popover-default-height: 12rem;
}

img.logo {margin:.1rem;height:auto;border:0;border-radius:0;}

header {
  position: sticky;
  top: 0;
  display: flex;
  gap: 0.1rem;
  background: #ddffdd;
  border-radius: 6px;
  box-shadow: 3px 3px 3px -1px rgba(74, 73, 74, 0.5);
  height: var(--header-height);
  padding: 0 0.1rem;
  width: 99%;   /*  nicht absolut  */
  z-index: 1000;
}

header h1 {
  font-size: 1em;
  margin: 0;
}

header nav.main-nav > ul {
  --nav-text-color: #2c2e33;
  display: flex;
  gap: 0.2rem;
  list-style: none;
  margin: 0;
  padding-inline: 0.1rem;
}

header nav.main-nav > ul > li > :is(button, a[href]) {
  border: none;
	background: white;  /* weiß wg. Dunkelmodus BF-Tools */
  color: var(--nav-text-color);
  cursor: pointer;
font-size: 1rem;   /*bis 23.6.26: .9rem;*/
  font-weight: bold;
  padding: 0.25rem;
  text-decoration: none;
}

header nav.main-nav > ul > li > :is(button, a[href]):focus,
header nav.main-nav > ul > li > :is(button, a[href]):hover {
  text-decoration: underline;
  color: #FF0000;
  background: #FFFFFF;
  outline: 2px solid #005fcc;
}

header nav.main-nav [popover] {
  border: 1px solid #999999;
  box-shadow: 3px 3px 3px -1px rgba(74, 73, 74, 0.5);
  margin: 0 auto;
  height: min(var(--nav-popover-default-height), var(--nav-popover-max-height));
  padding: 0.3rem 1rem;    /* war mal:   padding: 0.5rem 2rem;  */
  top: var(--header-height);
  width: 46em;
}

header nav.main-nav [popover] a[href]:focus,
header nav.main-nav [popover] a[href]:hover {
  text-decoration: underline;
  color: red;
  outline: 2px solid #005fcc;
  background-color: #f0f0f0;
}

header nav.main-nav [popover] h2 {
  font-size: 1.1rem;
  margin: 0;
}

header nav.main-nav [popover] ul {
  font-size: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

header nav.main-nav [popover] ul ul > li {
  margin-top: 0.3rem;
}

header nav.main-nav [popover] > ul {
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  gap: 1rem;
  height: calc(100% - var(--nav-popover-header-height));
}

header nav.main-nav [popover] > ul > li > a[href] {
  color: #000000;
  font-weight: bold;
}

/* Mobile menu styles */
header button.mobile-menu-btn {
  display: none;
  background: white;
  border: 0.125rem solid #556270;
  padding: 0.25rem;
  cursor: pointer;
}

header button.mobile-menu-btn div.icon {
  height: 1.75rem;
  aspect-ratio: 1;
  background: linear-gradient(#34495e 50%, #0000 0) top/100% 40% repeat-y;
}

header button.mobile-menu-btn:focus {
  outline: 2px solid #005fcc;
  background-color: #f0f0f0;
}

/* Mobile nav container - with and without popover support */
header #mobile-nav {
  border: none;
  inset: var(--header-height) 0 0;
  height: var(--nav-popover-max-height);
  margin: 0;
  padding: 0rem 1rem 2rem 1rem;
  width: 20rem;
  background: #ddffdd;
  z-index: 999;
}

/* Fallback for browsers without popover support */
header #mobile-nav:not([popover]) {
  display: none;
  position: fixed;
}

/* Show mobile nav when open */
header #mobile-nav[popover]:popover-open,
header #mobile-nav:not([popover]).open {
  display: block;
}

header #mobile-nav > * {
  margin-bottom: 0.1rem;
}

header #mobile-nav h2 {
  font-size: 1.1rem;
  margin-block: .7em .4em;
}

/* Mobile menu details/summary styling */
header #mobile-nav details {
  background: white;
  margin-bottom: 0.5rem;
  border-radius: 4px;
}

header #mobile-nav details summary {
  background: white;
  padding: 0.5rem;
  cursor: pointer;
  position: relative;
  font-weight: bold;
/*  display: block;   ab 27.10.25 entfernt */
}
/* header #mobile-nav details summary::before {content: "▼";}  ab 27.10.25 entfernt */

header #mobile-nav details summary:focus {
  outline: 2px solid #005fcc;
  background: #f0f0f0;
}

header #mobile-nav a:focus {
  outline: 2px solid #005fcc;
  background: #f0f0f0;
}

header #mobile-nav details[open] summary {
  background: #f0f0f0;
  margin-bottom: 0.4rem;
}
/* header #mobile-nav details[open] summary::before {content: "▲";}  ab 27.10.25 entfernt */

header #mobile-nav details ul {
  padding-left: 1rem;
	line-height: 1.4;
}

header #mobile-nav details ul li {
  margin-bottom: 0.1rem;
}

header #mobile-nav a {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  width: 100%;
}

/* Focus styles for all focusable elements */
header :is(button, a, summary):focus {
  outline: 2px solid #005fcc;
  background-color: #f0f0f0;
}

@media screen and (max-width: 54rem) {
  header {
    justify-content: space-between;
  }
  header nav.main-nav {
    display: none;
  }
  header button.mobile-menu-btn {
    display: inline-block;
  }
}

/* iOS 15 spezifische Fixes */
@supports (-webkit-touch-callout: none) and (not (translate: none)) {
  header #mobile-nav {
    transform: none; /* soll Rendering-Probleme vermeiden*/
    -webkit-overflow-scrolling: touch; /* Smooth scrolling */
  }
  
  header #mobile-nav details summary {
    -webkit-tap-highlight-color: transparent; /* Entfernt blauen Tap-Highlight */
  }
}

/* Legacy iOS Fallback */
@media screen and (max-width: 54rem) and (-webkit-min-device-pixel-ratio: 1.5) {
  header #mobile-nav:not([popover]) {
    position: fixed;
    overflow-y: scroll;
    -webkit-overflow-scrolling: touch;
  }
}