/* ============================================================
   CORE COMPONENTS — Buttons, Karten, Navigation, Formulare
   Struktur zentral, Charakter über Archetyp-Tokens.
   ============================================================ */

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.9em 1.8em;
  border-radius: var(--btn-radius, var(--radius-pill));
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); transition-duration: 80ms; }

.btn-primary { background: var(--c-brand); color: var(--c-brand-ink); }
.btn-primary:hover { box-shadow: 0 10px 25px color-mix(in srgb, var(--c-brand) 35%, transparent); }

.btn-ghost { border-color: currentColor; background: transparent; color: inherit; }
.btn-ghost:hover { background: color-mix(in srgb, currentColor 8%, transparent); }

.btn-lg { padding: 1.1em 2.4em; font-size: var(--text-md); }

/* Pfeil-Microinteraction im Button */
.btn .arrow { transition: transform var(--dur-fast) var(--ease-out); }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- KARTEN ---------- */
.card {
  background: var(--card-bg, var(--c-bg));
  border: var(--card-border, var(--border-hairline));
  border-radius: var(--radius-lg);
  overflow: clip;
  display: flex;
  flex-direction: column;
  transition: transform var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}
.card-body { padding: var(--space-lg); display: flex; flex-direction: column; gap: var(--space-sm); flex: 1; }
.card h3 { font-size: var(--text-lg); }
.card .card-link {
  margin-top: auto;
  font-weight: 600;
  text-decoration: none;
  color: var(--c-brand);
  display: inline-flex; align-items: center; gap: 0.4em;
}

/* Hover: Lift + Bildzoom, ruhig und teuer wirkend */
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.card .media img { transition: transform calc(var(--dur-slow) * 1.2) var(--ease-out); }
.card:hover .media img { transform: scale(1.05); }
.card:hover .card-link .arrow { transform: translateX(4px); }
.card .card-link .arrow { transition: transform var(--dur-fast) var(--ease-out); }

/* ---------- NAVIGATION ---------- */
.site-nav {
  position: fixed;
  inset-inline: 0; top: 0;
  z-index: var(--z-nav);
  transition: background-color var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out),
              padding var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
  padding-block: clamp(0.9rem, 2vw, 1.4rem);
}
.site-nav .nav-inner {
  width: min(100% - 2 * var(--gutter), var(--w-wide));
  margin-inline: auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-lg);
}
.site-nav .brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-md);
  text-decoration: none;
  letter-spacing: var(--tracking-tight);
}
.site-nav ul {
  display: flex; gap: clamp(1rem, 2.5vw, 2.5rem);
  list-style: none; padding: 0;
}
.site-nav ul a {
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  position: relative;
  padding-block: 0.3em;
}
/* Underline-Microinteraction */
.site-nav ul a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1.5px; background: currentColor;
  transform: scaleX(0); transform-origin: right;
  transition: transform var(--dur-base) var(--ease-out);
}
.site-nav ul a:hover::after,
.site-nav ul a[aria-current="page"]::after { transform: scaleX(1); transform-origin: left; }

/* Zustand nach Scroll (JS setzt .is-scrolled), Hide-on-scroll-down (.is-hidden) */
.site-nav.is-scrolled {
  background: color-mix(in srgb, var(--nav-bg, var(--c-bg)) 88%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
  padding-block: 0.7rem;
}
.site-nav.is-hidden { transform: translateY(-100%); }

/* Nav auf transparentem Hero: Startfarbe hell */
.site-nav.nav-on-media:not(.is-scrolled) { color: var(--c-ink-invert); }

@media (max-width: 820px) {
  .site-nav ul { display: none; }
  .site-nav .nav-cta { display: inline-flex; }
}
@media (max-width: 480px) {
  .site-nav .nav-inner { gap: var(--space-sm); }
  .site-nav .brand { font-size: 0.95rem; gap: 0.4em; }
  .site-nav .nav-cta { padding: 0.5em 0.8em; font-size: 0.72rem; flex-shrink: 0; }
}

/* ---------- FORMULARE ---------- */
.field { display: grid; gap: 0.4em; }
.field label { font-size: var(--text-sm); font-weight: 600; }
.field input, .field textarea, .field select {
  font: inherit;
  padding: 0.8em 1em;
  border: 1.5px solid var(--c-line);
  border-radius: var(--radius-sm);
  background: var(--c-bg);
  color: var(--c-ink);
  transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none;
  border-color: var(--c-brand);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-brand) 20%, transparent);
}

/* ---------- KENNZAHLEN ---------- */
.stat { display: grid; gap: 0.2em; }
.stat .stat-value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  line-height: 1;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
}
.stat .stat-label { font-size: var(--text-sm); color: var(--c-ink-soft); }
.section-dark .stat .stat-label,
.section-brand .stat .stat-label { color: color-mix(in srgb, currentColor 70%, transparent); }

/* ---------- MARQUEE (Logo-/Begriffsband) ---------- */
.marquee { overflow: clip; white-space: nowrap; }
.marquee-track {
  display: inline-flex; gap: var(--space-xl);
  padding-block: var(--space-md);
  animation: marquee 40s linear infinite;
}
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- FOOTER ---------- */
.site-footer {
  background: var(--c-bg-dark);
  color: var(--c-ink-invert);
  padding-block: var(--space-xl) var(--space-lg);
  font-size: var(--text-sm);
}
.site-footer a { color: inherit; }