/* ==================== Basis ==================== */

body {
  margin: 0;
  background-color: #2f2e2b;
  color: #ffffff;
  font-family: "Montserrat", sans-serif;
}

/* ==================== Barrierefreiheit ==================== */

/* Der Sprunglink bleibt unsichtbar, ist aber für Tastatur-Nutzer erreichbar. */
.skip-link {
  position: absolute;
  top: 11rem;
  left: -9999px;
  z-index: 20;
  padding: 0.75rem 1rem;
  background-color: #ffffff;
  color: #000000;
}

.skip-link:focus {
  left: 1rem;
}

/* Visuell ausgeblendete Überschriften behalten ihre semantische Funktion. */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  border: 0;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* ==================== Header und Logo ==================== */

.site-header {
  position: sticky; /* KANN MAN EINSTELLEN, ob header fix ist oder nicht */
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background-color: #262522;
}

.logo img {
  width: 200px;
  height: auto;
}

.site-header h1 {
  margin: 0;
  color: #ffffff;
  font-size: 3rem;
}

/* Die beiden Textteile bleiben direkt nebeneinander. */
.titel-schachclub {
  color: #ffffff;
}

.titel-dhbw {
  color: #a61b1b;
  font-family: Caponic, sans-serif;
  font-style: italic;
  font-weight: bold;
}

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

.site-menu {
  position: relative;
  color: #ffffff;
  font-weight: bold;
}

.site-menu summary {
  padding: 0.75rem 1rem;
  border: 1px solid #ffffff;
  border-radius: 4px;
  cursor: pointer;
  list-style: none;
}

.Menü {
  background-color: #8b0000;
}

.site-menu summary::-webkit-details-marker {
  display: none;
}

.site-menu summary::after {
  content: " ▾";
}

.site-menu[open] summary::after {
  content: " ▴";
}

/* Das geöffnete Menü wird unterhalb der Schaltfläche eingeblendet. */
.site-menu nav {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  z-index: 1;
  min-width: 190px;
  border-radius: 4px;
  background-color: #a61b1b;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.nav-list {
  margin: 0;
  padding: 0.5rem 0;
  list-style: none;
}

.nav-list a {
  display: block;
  padding: 8px 16px;
  color: white;
  text-decoration: none;
}

.nav-list a:hover {
  background-color: #650000;
}

/* Ein klar sichtbarer Fokusring für Tastaturbedienung. */
.nav-list a:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 2px;
  background-color: #ffffff;
  color: #8b0000;
}

/* ==================== Hinweisbanner ==================== */

.projekt-hinweis {
  padding: 0.75rem 1rem;
  background-color: #f5d547;
  color: #262522;
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
}

/* ==================== Startbild ==================== */

.startbild {
  width: 100%;
}

.startbild img {
  display: block;
  width: 100%;
  height: auto;
}

/* ==================== Kategorien ==================== */

.interessen-bereich {
  max-width: 1180px;
  margin: 0 auto;
  padding: 3rem 1rem 4rem;
  text-align: center;
}

.interessen-bereich h2 {
  margin: 2.5rem 0 1.25rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

.kategorien {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

.kategorie {
  display: grid;
  min-height: 150px;
  justify-items: center;
  align-content: center;
  gap: 1rem;
  padding: 1.5rem;
  border: 2px solid #ffffff;
  border-radius: 4px;
  background-color: #262522;
  color: #ffffff;
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

.kategorie-icon {
  display: grid;
  width: 6rem;
  height: 6rem;
  place-items: center;
  border-radius: 50%;
  background-color: #3a3936;
  color: #ffffff;
  font-size: 2.5rem;
  line-height: 1;
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.kategorie-icon:hover,
.kategorie-icon:focus-visible {
  background-color: #1c1b19;
}

.kategorie-icon:focus-visible,
.anmeldung-link:focus-visible {
  outline: 3px solid #f5d547;
  outline-offset: 4px;
}

.anmeldung-link {
  display: block;
  width: 35%;
  margin-top: 2rem;
  margin-right: auto;
  margin-left: auto;
  padding: 1.25rem 2rem;
  box-sizing: border-box;
  border-radius: 4px;
  background-color: #8b0000;
  color: #ffffff;
  font-size: 1.5rem;
  font-weight: 600;
  text-decoration: none;
}

.anmeldung-link:hover {
  background-color: #650000;
}

/* ==================== Footer ==================== */

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.5rem 2rem;
  background-color: #262522;
  color: #ffffff;
  font-size: 0.875rem;
}

.site-footer p {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  color: #ffffff;
  text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: #ff6b6b;
}

.footer-links a:focus-visible {
  outline: 2px solid #ff6b6b;
  outline-offset: 4px;
}

@media (max-width: 600px) {
  .site-header {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
  }

  .logo img {
    width: 140px;
  }

  .site-header h1 {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: center;
    font-size: clamp(1.5rem, 8vw, 2.25rem);
    text-align: center;
  }

  .site-menu {
    grid-column: 2;
    grid-row: 1;
  }

  .site-menu nav {
    max-width: calc(100vw - 2rem);
  }

  .kategorien {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
    padding: 1.5rem 1rem;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}