:root {
  --clr-bg: #f6f7f9;
  --clr-surface: #ffffff;
  --clr-border: #dde3ea;
  --clr-text: #1a1a1a;
  --clr-text-muted: #5b6673;
  --clr-accent: #1b3a5c;
  --clr-accent-hover: #264d7a;
  --clr-accent-light: #e8eef5;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(27, 58, 92, 0.08);
  --shadow-hover: 0 6px 18px rgba(27, 58, 92, 0.12);
  --max-width: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--clr-text);
  background: var(--clr-bg);
}

/* ---------- Skip-Link & Fokus ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--clr-accent);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius) 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

main[tabindex="-1"]:focus { outline: none; }

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--clr-accent-hover);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- Überschrift-Ebene 4 ---------- */
h4 {
  font-size: 1.05rem;
  line-height: 1.35;
  color: var(--clr-text);
  margin: 1.5rem 0 0.5rem;
}

/* Nur für Screenreader sichtbar (z. B. Seitenüberschrift) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
}
.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  flex-wrap: wrap;
}
.wordmark {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--clr-accent);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.wordmark:hover { color: var(--clr-accent-hover); }
.site-header__tag {
  color: var(--clr-text-muted);
  font-size: 0.95rem;
}

/* ---------- Intro ---------- */
.intro {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 1rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.25rem 2.5rem;
  flex-wrap: wrap;
}
.intro h1 {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1.25;
  margin: 0 0 0.6rem;
  color: var(--clr-accent);
}
.intro p {
  max-width: 46rem;
  margin: 0;
  color: var(--clr-text-muted);
  font-size: 1.125rem;
}

/* ---------- Schlagwortsuche ---------- */
/* Suchfeld rechts oben neben der Überschrift; der optische Abstand
   zum rechten Bildschirmrand entsteht durch das Intro-Padding
   (1.5rem) innerhalb der zentrierten max-width-Spalte. */
.suche {
  position: relative;
  display: flex;
  align-items: center;
  flex-shrink: 0;
  /* optisch auf die erste Zeile der h1 ausgerichtet */
  margin-top: 0.45rem;
}
.suche__input {
  width: min(320px, 100%);
  min-height: 56px;
  padding: 0.55rem 2.9rem 0.55rem 2.75rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--clr-surface);
  color: var(--clr-text);
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease;
  -webkit-appearance: none;
          appearance: none;
}
.suche__input::-webkit-search-decoration,
.suche__input::-webkit-search-cancel-button,
.suche__input::-webkit-search-results-button,
.suche__input::-webkit-search-results-decoration {
  -webkit-appearance: none;
}
.suche__input:focus {
  outline: none;
  border-color: var(--clr-accent);
}
.suche__input:focus-visible {
  outline: 3px solid var(--clr-accent-hover);
  outline-offset: 2px;
}
.suche__icon {
  position: absolute;
  left: 0.95rem;
  top: 50%;
  transform: translateY(-50%);
  width: 21px;
  height: 21px;
  color: var(--clr-text-muted);
  pointer-events: none;
}
.suche__clear {
  position: absolute;
  right: 0.4rem;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 6px;
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  color: var(--clr-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  line-height: 1.2;
  padding: 0;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  touch-action: manipulation;
}
.suche__clear:hover,
.suche__clear:focus-visible {
  background: var(--clr-accent);
  color: #fff;
  border-color: var(--clr-accent);
}
.suche__clear.is-hidden { display: none; }

/* Sichtbare Trefferanzeige (zugleich Live-Region für Screen-Reader) */
.suche-status {
  margin: 0.5rem 0 0;
  font-size: 0.95rem;
  color: var(--clr-text-muted);
}
.suche-status:empty { display: none; }

/* Kleine Bildschirme: Suchfeld rückt unter die Überschrift */
@media (max-width: 720px) {
  .suche {
    flex: 1 1 100%;
    margin-top: 0.25rem;
  }
  .suche__input { width: 100%; }
}

/* ---------- Content-Grid ---------- */
.grid-bereich {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem 4rem;
}
.kategorie { margin-top: 2.5rem; }
.kategorie h2 {
  font-size: 1.35rem;
  margin: 0 0 0.25rem;
}
.kategorie__beschreibung {
  margin: 0 0 1.25rem;
  color: var(--clr-text-muted);
}
.kacheln {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(21.0rem, 1fr));
  gap: 1.25rem;
}
/* Von der Schlagwortsuche ausgeblendete Kacheln/Kategorien: das
   hidden-Attribut muss sich gegen display:flex durchsetzen. */
.kachel[hidden],
.kategorie[hidden] { display: none; }

.kachel {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.4rem 1.4rem 1.2rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease,
    border-color 0.2s ease;
}
/* „Stretched-Link": der Kacheltitel-Link überlagert per ::after die
   gesamte Kachel, damit die Kachel wie zuvor komplett klickbar ist,
   ohne ein interaktives Element (QR-Button) in einen Link zu verschachteln. */
.kachel__link {
  text-decoration: none;
  color: inherit;
}
.kachel__link::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
}
.kachel:has(.kachel__link:hover),
.kachel:has(.kachel__link:focus-visible) {
  box-shadow: var(--shadow-hover);
  border-color: var(--clr-accent);
  transform: translateY(-2px);
}
.kachel__symbol { display: none; }
.kachel h3 {
  margin: 0 0 0.45rem;
  font-size: 1.15rem;
  line-height: 1.35;
  color: var(--clr-accent);
}
.kachel p {
  margin: 0 0 1rem;
  font-size: 0.97rem;
  color: var(--clr-text-muted);
  flex-grow: 1;
}
.kachel__fuss {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  border-top: 1px solid var(--clr-border);
  padding-top: 0.8rem;
}
.kachel__meta {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}
.kachel__lizenz {
  display: block;
  margin: 0 0 0.8rem;
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}
.kachel__aktionen {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.kachel__pfeil {
  color: var(--clr-accent);
  font-size: 1.2rem;
  line-height: 1;
  transition: transform 0.2s ease;
}
.kachel:has(.kachel__link:hover) .kachel__pfeil,
.kachel:has(.kachel__link:focus-visible) .kachel__pfeil {
  transform: translateX(4px);
}

/* Quadratischer QR-Button (44×44 px Touch-Ziel), links neben dem
   Pfeil. Höherer z-index als der Stretched-Link, damit er
   eigenständig klickbar bleibt statt die Kartennavigation
   auszulösen. */
.kachel__qr-btn {
  position: relative;
  z-index: 2;
  width: 44px;
  height: 44px;
  min-width: 44px;
  flex-shrink: 0;
  border-radius: 6px;
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  padding: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.kachel__qr-btn:hover,
.kachel__qr-btn:focus-visible {
  border-color: var(--clr-accent);
  box-shadow: var(--shadow);
}
.kachel__qr-thumb {
  width: 32px;
  height: 32px;
  object-fit: contain;
  pointer-events: none;
}

.qr-dialog {
  position: fixed;
  inset: 0;
  margin: auto;
  width: fit-content;
  height: fit-content;
  max-height: 92vh;
  overflow: auto;
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
  padding: 4rem 4rem 1.75rem;
  max-width: min(92vw, calc(512px + 8rem));
  background: var(--clr-surface);
  color: var(--clr-text);
}
.qr-dialog::backdrop {
  background: rgba(20, 28, 42, 0.6);
}
.qr-dialog__close {
  position: absolute;
  top: 1.0rem;
  right: 1.0rem;
  width: 44px;
  height: 44px;
  border-radius: 6px;
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  color: var(--clr-accent);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.qr-dialog__close:hover,
.qr-dialog__close:focus-visible {
  background: var(--clr-accent-light);
  border-color: var(--clr-accent);
}
.qr-dialog__image-wrapper {
  display: flex;
  justify-content: center;
}
.qr-dialog__image {
  display: block;
  width: clamp(256px, 80vw, 512px);
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--clr-border);
  border-radius: 8px;
  background: #fff;
}
.qr-dialog__caption {
  margin: 1rem 0 0;
  text-align: center;
  font-size: 0.95rem;
  color: var(--clr-text-muted);
}
.qr-dialog__aktionen {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.75rem;
  margin-top: 1.25rem;
}
.qr-dialog__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: 8px;
  border: 1px solid var(--clr-border);
  background: var(--clr-accent-light);
  color: var(--clr-accent);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.qr-dialog__btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.qr-dialog__btn:hover,
.qr-dialog__btn:focus-visible {
  background: var(--clr-accent);
  color: #fff;
  border-color: var(--clr-accent);
}

/* ---------- Toast (Statusmeldungen, z. B. Speicherfehler) ---------- */
.toast {
  position: fixed;
  top: 1rem;
  right: 1rem;
  transform: translateY(-12px);
  background: var(--clr-accent);
  color: #fff;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 14px;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
  z-index: 200;
}
.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Unterseiten ---------- */
.seite {
  max-width: 46rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}
.seite h1 {
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  color: var(--clr-accent);
  margin: 0 0 1.2rem;
}
.seite h2 {
  font-size: 1.25rem;
  margin: 2rem 0 0.5rem;
}
.seite h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}
.seite p {
  margin: 0 0 1rem;
  font-size: 1.0625rem;
  color: var(--clr-text-muted);
}
.seite li {
  font-size: 1.0625rem;
  color: var(--clr-text-muted);
}
.hervorhebung {
  font-weight: bold;
  color: var(--clr-accent);
}
.seite a { color: var(--clr-accent); }
.seite a:hover { color: var(--clr-accent-hover); }
.hinweis-box {
  background: var(--clr-accent-light);
  border-left: 4px solid var(--clr-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 0.9rem 1.1rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  margin-top: auto;
}
.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.6rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-footer nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.site-footer a {
  color: var(--clr-text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 0.7rem 0;
  display: inline-block;
}
.site-footer a:hover,
.site-footer a:focus-visible { color: var(--clr-accent); }

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex-grow: 1; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .kachel, .kachel__pfeil,
  .kachel__qr-btn, .qr-dialog__btn, .qr-dialog__close, .toast,
  .suche__input, .suche__clear {
    transition: none;
  }
}