/* ==========================================================================
   Entwurf 9 - Standbild. Links bleibt ein Bild stehen, rechts laufen die
   Felder durch. Das Bild wechselt, sobald ein neues Feld im Blick ist.
   Umgesetzt mit position sticky und IntersectionObserver, ohne Fremdcode.
   Layout unabhaengig vom Brandkit.
   ========================================================================== */
:root { --maxw: 1240px; --takt: clamp(4rem, 7vw, 6rem); }

.js-scroll [data-auftritt] { opacity: 0; transform: translateY(20px); }
.js-scroll [data-auftritt].ist-da {
  opacity: 1; transform: none;
  transition: opacity .6s cubic-bezier(.16,1,.3,1) var(--verzug, 0ms),
              transform .6s cubic-bezier(.16,1,.3,1) var(--verzug, 0ms);
}

/* --- Kopf ---------------------------------------------------------------- */
.kopf { position: sticky; top: 0; z-index: 60; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); }
.kopf__reihe { display: flex; align-items: center; gap: 2rem; height: 70px; }
.hauptnav { margin-inline-start: auto; }
.hauptnav ul { display: flex; gap: 1.6rem; }
.hauptnav a { text-decoration: none; font-size: .9375rem; color: var(--text-muted); white-space: nowrap; }
.hauptnav a:hover, .hauptnav a.ist-aktiv { color: var(--accent-text); }
@media (max-width: 860px) { .hauptnav { display: none; } }

.knopf {
  display: inline-flex; align-items: center; gap: .5rem; justify-content: center;
  padding: .8rem 1.4rem; border-radius: var(--r-pill); border: 1px solid transparent;
  font-weight: 650; font-size: .9375rem; text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: background-color .16s ease, transform .12s ease, border-color .16s ease;
}
.knopf--voll { background: var(--accent); color: var(--on-accent); }
.knopf--voll:hover { background: var(--accent-hover); }
.knopf--linie { background: transparent; color: var(--text); border-color: var(--border); }
.knopf--linie:hover { border-color: var(--accent); color: var(--accent-text); }
.knopf--hell { background: var(--on-inverse); color: var(--inverse); }
.knopf--hell:hover { background: var(--accent); color: var(--on-accent); }
.knopf:active { transform: translateY(1px); }
.knopf--klein { padding: .55rem 1rem; font-size: .875rem; }

/* --- Auftakt ------------------------------------------------------------- */
.auftakt { padding-block: clamp(3.5rem, 8vw, 6rem) clamp(2.5rem, 5vw, 4rem); text-align: left; }
.auftakt__marke { display: inline-block; font-family: var(--font-mono); font-size: .75rem; text-transform: uppercase; letter-spacing: .14em; color: var(--accent-text); margin-bottom: 1.2rem; }
.auftakt h1 { font-size: clamp(2.2rem, 5vw, 3.7rem); font-weight: var(--display-weight); line-height: 1.08; max-width: 20ch; margin-bottom: 1.3rem; text-transform: var(--display-transform); }
.auftakt p { font-size: clamp(1.0625rem, 1.5vw, 1.1875rem); color: var(--text-muted); max-width: 50ch; margin-bottom: 2rem; }
.auftakt__aktionen { display: flex; flex-wrap: wrap; gap: .8rem; }

/* --- Standbild und Felder -------------------------------------------------- */
.gespann { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; padding-bottom: var(--takt); }

.buehne { position: sticky; top: 96px; height: min(70vh, 560px); border-radius: calc(var(--r) + 6px); overflow: hidden; background: var(--bg-alt); }
.buehne__bild { position: absolute; inset: 0; opacity: 0; transition: opacity .5s ease; }
.buehne__bild.ist-aktiv { opacity: 1; }
.buehne__bild img { width: 100%; height: 100%; object-fit: cover; }
.buehne__marke {
  position: absolute; inset-inline-start: 1.25rem; inset-block-end: 1.25rem;
  background: var(--inverse); color: var(--on-inverse);
  font-family: var(--font-mono); font-size: .75rem; letter-spacing: .08em;
  text-transform: uppercase; padding: .45rem .8rem; border-radius: var(--r-sm);
}
.buehne__ohnebild { position: absolute; inset: 0; display: grid; place-items: center; opacity: 0; transition: opacity .5s ease; background: var(--accent-soft); }
.buehne__ohnebild.ist-aktiv { opacity: 1; }
.buehne__ohnebild svg { width: 96px; height: 96px; fill: var(--accent); }

.felder { display: grid; gap: clamp(3rem, 8vw, 6rem); }
.feld { min-height: 44vh; display: flex; flex-direction: column; justify-content: center; }
.feld__nr { font-family: var(--font-mono); font-size: .8125rem; color: var(--accent-text); margin-bottom: .9rem; letter-spacing: .1em; }
.feld h2 { font-size: clamp(1.5rem, 2.8vw, 2.1rem); font-weight: var(--display-weight); line-height: 1.2; margin-bottom: .9rem; max-width: 20ch; text-transform: var(--display-transform); }
.feld p { color: var(--text-muted); max-width: 46ch; margin-bottom: 1.4rem; }
.feld__daten { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; font-family: var(--font-mono); font-size: .8125rem; color: var(--text-muted); margin-bottom: 1.4rem; font-variant-numeric: tabular-nums; }
.feld__daten b { color: var(--text); font-weight: 500; }
.feld__mehr { display: inline-flex; align-items: center; gap: .45rem; font-size: .9375rem; font-weight: 650; color: var(--accent-text); text-decoration: none; align-self: flex-start; }
.feld__mehr svg { width: 16px; height: 16px; fill: currentColor; transition: transform .18s ease; }
.feld__mehr:hover svg { transform: translateX(3px); }

@media (max-width: 900px) {
  .gespann { grid-template-columns: 1fr; }
  .buehne { position: static; height: 260px; margin-bottom: 2rem; }
  .feld { min-height: 0; }
  .felder { gap: 3rem; }
}

/* --- Abschnitte ---------------------------------------------------------- */
.abschnitt { padding-block: var(--takt); }
.abschnitt--getoent { background: var(--bg-alt); }
.abschnitt__kopf { max-width: 50ch; margin-bottom: clamp(2rem, 4vw, 3rem); }
.abschnitt__kopf h2 { font-size: clamp(1.8rem, 3.2vw, 2.5rem); font-weight: var(--display-weight); margin-bottom: .9rem; text-transform: var(--display-transform); }
.abschnitt__kopf p { color: var(--text-muted); font-size: 1.0625rem; }

/* --- Vier Schritte -------------------------------------------------------- */
.schritte { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.schritt { padding-top: 1.2rem; border-top: 2px solid var(--accent); }
.schritt b { display: block; font-family: var(--font-mono); font-size: .75rem; color: var(--accent-text); letter-spacing: .1em; margin-bottom: .7rem; }
.schritt h3 { font-size: 1.0625rem; font-weight: 700; margin-bottom: .4rem; }
.schritt p { font-size: .9375rem; color: var(--text-muted); }
@media (max-width: 900px) { .schritte { grid-template-columns: 1fr 1fr; } }
@media (max-width: 540px) { .schritte { grid-template-columns: 1fr; } }

/* --- Abschluss ----------------------------------------------------------- */
.abschluss { background: var(--inverse); color: var(--on-inverse); border-radius: calc(var(--r) + 6px); padding: clamp(2.25rem, 5vw, 3.5rem); display: grid; grid-template-columns: 1fr auto; gap: 2.5rem; align-items: center; }
.abschluss h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: var(--display-weight); margin-bottom: .7rem; text-transform: var(--display-transform); }
.abschluss p { color: var(--on-inverse-muted); max-width: 46ch; }
@media (max-width: 820px) { .abschluss { grid-template-columns: 1fr; } }

/* --- Fuss ---------------------------------------------------------------- */
.fuss { border-top: 1px solid var(--border); padding-block: 3rem 2.25rem; font-size: .9375rem; }
.fuss__raster { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2.5rem; }
.fuss h3 { font-size: .8125rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-muted); margin-bottom: 1rem; font-weight: 650; }
.fuss li { margin-bottom: .5rem; }
.fuss a { text-decoration: none; color: var(--text-muted); }
.fuss a:hover { color: var(--accent-text); }
.fuss__zertifikat { font-size: .8125rem; color: var(--text-muted); line-height: 1.6; max-width: 44ch; margin-top: 1rem; }
.fuss__unten { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: 1rem 2rem; justify-content: space-between; font-size: .8125rem; color: var(--text-muted); }
@media (max-width: 720px) { .fuss__raster { grid-template-columns: 1fr; } }