/* ============================================================
   VCI Design — Komponenten
   Skip-Link, Header, Navigation, Footer.
   Grundstruktur ohne Feinschliff. Alle Bewegung laeuft ueber
   transform/opacity und die Motion-Tokens.
   ============================================================ */

/* --- Skip-Link -----------------------------------------------
   Erstes fokussierbares Element im Dokument. Nur bei Fokus
   sichtbar, springt an den Hauptinhalt.
   ------------------------------------------------------------ */
.skip-link {
  position: absolute;
  top: var(--space-s);
  left: var(--space-s);
  z-index: calc(var(--z-overlay) + 1);
  padding: var(--space-xs) var(--space-s);
  background-color: var(--color-fg);
  color: var(--color-bg);
  font-size: var(--text-small);
  font-weight: var(--weight-semibold);
  text-decoration: none;
  border-radius: 2px;
  transform: translateY(-150%);
  transition: transform var(--duration-short) var(--ease-enter);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* --- Header --------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-m);
  min-height: var(--header-height);
}

/* --- Wortmarke -------------------------------------------------
   Platzhalter in Schrift. Das Logo-Asset ersetzt das spaeter.
   ---------------------------------------------------------------- */
.wordmark {
  font-family: var(--font-display);
  font-size: var(--text-medium);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-heading);
  text-decoration: none;
  white-space: nowrap;
}

.wordmark:hover {
  color: var(--color-accent-ink);
}

/* --- Hauptnavigation ------------------------------------------- */
.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-l);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding-block: var(--space-xs);
  font-size: var(--text-small);
  font-weight: var(--weight-regular);
  text-decoration: none;
  color: var(--color-fg-muted);
}

.site-nav__link:hover {
  color: var(--color-fg);
}

/* Aktiver Zustand haengt an aria-current, nicht an einer
   Extra-Klasse. Eine Quelle der Wahrheit fuer Screenreader
   und visuelle Darstellung. */
.site-nav__link[aria-current="page"] {
  color: var(--color-fg);
  font-weight: var(--weight-semibold);
}

/* Unterstrich als Akzentflaeche, nicht als Textfarbe. Skaliert
   ueber transform, damit die Animation GPU-beschleunigt bleibt. */
.site-nav__link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--duration-short) var(--ease-base);
}

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* --- Mobile-Toggle ---------------------------------------------
   Ab 769px ausgeblendet. Die drei Balken bilden im geoeffneten
   Zustand ein Kreuz, ausschliesslich per transform.
   ---------------------------------------------------------------- */
.nav-toggle {
  display: none;
  position: relative;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  flex: none;
}

.nav-toggle__bar {
  position: absolute;
  left: 50%;
  width: 1.375rem;
  height: 2px;
  margin-left: -0.6875rem;
  background-color: var(--color-fg);
  transition: transform var(--duration-short) var(--ease-base),
              opacity var(--duration-short) var(--ease-base);
}

.nav-toggle__bar:nth-child(1) { top: calc(50% - 6px); }
.nav-toggle__bar:nth-child(2) { top: calc(50% - 1px); }
.nav-toggle__bar:nth-child(3) { top: calc(50% + 4px); }

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* --- Mobile-Navigation ------------------------------------------
   Breakpoint deckungsgleich mit --grid-columns in tokens.css und
   dem isMobile-Kontext in js/motion.js.
   ---------------------------------------------------------------- */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-height) 0 0 0;
    z-index: var(--z-overlay);
    background-color: var(--color-bg);
    padding: var(--space-l) var(--page-padding);
    opacity: 0;
    transform: translateY(-0.5rem);
    visibility: hidden;
    transition: opacity var(--duration-short) var(--ease-base),
                transform var(--duration-short) var(--ease-base),
                visibility 0s linear var(--duration-short);
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
    transition-delay: 0s;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-m);
  }

  .site-nav__link {
    font-size: var(--text-heading-medium);
    font-family: var(--font-display);
  }

  /* Der Unterstrich wirkt in der Overlay-Liste unruhig. */
  .site-nav__link::after {
    display: none;
  }

  /* Scrollsperre, solange das Overlay offen ist. */
  body[data-nav-open="true"] {
    overflow: hidden;
  }
}

/* --- Footer ------------------------------------------------------ */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-xl);
  margin-top: var(--space-xxl);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-l);
}

.site-footer__nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s) var(--space-l);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer a {
  font-size: var(--text-small);
  color: var(--color-fg-muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-fg);
}

.site-footer .wordmark {
  font-size: var(--text-medium);
  color: var(--color-fg);
}

.site-footer__meta {
  width: 100%;
  padding-top: var(--space-m);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xx-small);
  color: var(--color-fg-muted);
}

/* --- Platzhalter fuer den noch leeren Hauptinhalt ---------------
   Faellt weg, sobald die erste echte Sektion eingehaengt wird.
   ---------------------------------------------------------------- */
.scaffold-note {
  padding-block: var(--space-xxl);
  color: var(--color-fg-muted);
}

.scaffold-note p {
  margin-top: var(--space-s);
  max-width: 60ch;
}

.scaffold-note__label {
  display: inline-block;
  margin-bottom: var(--space-s);
  font-size: var(--text-xx-small);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-accent-ink);
}