/* =========================================================
   DAU Wärmepumpen-Landingpage – Stylesheet
   Tokens nach Design.md (dau-flintbek.de)
   ========================================================= */

/* Falls die Original-Schrift „Gothic“ vorliegt: TTFs nach assets/fonts/ legen,
   die beiden @font-face-Blöcke aktivieren – Jost dient dann nur als Fallback. */
/*
@font-face { font-family: Gothic; src: url(assets/fonts/GOTHIC.TTF) format("truetype"); font-weight: 400; font-display: swap; }
@font-face { font-family: Gothic; src: url(assets/fonts/gothicb.ttf) format("truetype"); font-weight: 700; font-display: swap; }
*/

:root {
  --color-primary:       #869EBB;   /* dau-blue */
  --color-primary-dark:  #2B333D;   /* Text & Button-Hover */
  --color-accent:        #E07D3C;   /* Highlight-Wörter */
  --color-accent-dark:   #B66A39;   /* CTA-Fläche (4,1:1 mit Weiß) */
  --color-tint:          #EFF6FE;   /* alice blue */
  --color-surface:       #FFFFFF;
  --color-text:          #2B333D;
  --color-muted:         #6B7785;   /* dunkler als #939FAA für AA-Kontrast */
  --color-error:         #B3261E;
  --color-success:       #2E7D4F;
  --color-star:          #F5C518;

  --font: Gothic, "Century Gothic", Jost, sans-serif;
  --radius: .5rem;
  --container: 80rem;
  --section-y: 6rem;
  --transition: all .35s ease-in-out;
}

/* ---------- Reset & Basis ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 400 1rem/1.5 var(--font);
  color: var(--color-text);
  background: var(--color-surface);
  padding-bottom: calc(4.5rem + env(safe-area-inset-bottom)); /* Platz für Sticky-Bar mobil */
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
[hidden] { display: none !important; }
a { color: inherit; }
h1, h2, h3, h4 { margin: 0 0 1rem; font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2rem, 4.2vw, 3.1rem); }
h2 { font-size: clamp(1.75rem, 3.4vw, 3rem); }
h3 { font-size: 1.5rem; line-height: 1.4; }
.h3 { font-size: clamp(1.5rem, 2.4vw, 2rem); }
.h4 { font-size: clamp(1.375rem, 2vw, 1.75rem); line-height: 1.3; }
p { margin: 0 0 1rem; }
ul, ol { margin: 0; padding: 0; }
.highlight { color: var(--color-accent); }
.lead { font-size: 1.125rem; }
.tiny { font-size: .8125rem; color: var(--color-muted); }
.muted { color: var(--color-muted); }
.center { text-align: center; }
.mt-8 { margin-top: 2.5rem; }
.eyebrow { font-size: .9375rem; color: var(--color-primary); font-weight: 500; margin-bottom: .75rem; }
.stars { color: var(--color-star); letter-spacing: .05em; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 5%; }
.container.narrow { max-width: 52rem; }
.section { padding: var(--section-y) 0; }
.section--tint { background: var(--color-tint); }
.section--slim { padding: 3rem 0; }
.section__head { max-width: 46rem; margin-bottom: 3rem; }
.section__head .lead { margin-bottom: 0; }

@media (max-width: 991px) { :root { --section-y: 5rem; } }
@media (max-width: 767px) {
  :root { --section-y: 3.25rem; }
  .lead { font-size: 1.0625rem; }
  .section__head { margin-bottom: 1.75rem; }
  .section--slim { padding: 2.25rem 0; }
  h2 { font-size: 1.65rem; }
  .h3 { font-size: 1.35rem; }
  .h4 { font-size: 1.25rem; }
  .container { padding: 0 1.125rem; }
  .btn--large { width: 100%; }
  .mt-8 { margin-top: 1.75rem; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .75rem;
  font: 500 1rem/1.5 var(--font);
  padding: .75rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  text-decoration: none; cursor: pointer;
  transition: var(--transition);
  min-height: 2.75rem;
}
.btn svg { width: 1.125rem; height: 1.125rem; fill: currentColor; flex: none; }
.btn--primary { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.btn--primary:hover, .btn--primary:focus-visible { background: var(--color-primary-dark); border-color: var(--color-primary-dark); }
.btn--accent { background: var(--color-accent-dark); border-color: var(--color-accent-dark); color: #fff; }
.btn--accent:hover, .btn--accent:focus-visible { background: var(--color-primary-dark); border-color: var(--color-primary-dark); }
.btn--ghost { background: transparent; border-color: var(--color-primary); color: var(--color-primary-dark); }
.btn--ghost:hover { background: var(--color-tint); }
.btn--large { padding: .95rem 2rem; font-size: 1.0625rem; }
.btn:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; }

/* ---------- Header ---------- */
.header { background: var(--color-tint); position: sticky; top: 0; z-index: 50; }
.header__inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-top: .75rem; padding-bottom: .75rem; }
.header__logo img { width: 150px; height: auto; }
.header__contact { display: flex; align-items: center; gap: 1.25rem; }
.header__hint { font-size: .9375rem; }
@media (max-width: 767px) {
  .header__inner { padding-top: .5rem; padding-bottom: .5rem; }
  .header__logo img { width: 96px; }
  .header__hint { display: none; }
  .header__contact .btn { padding: .5rem .875rem; font-size: .9375rem; min-height: 2.5rem; }
}
@media (max-width: 379px) {
  .header__contact .btn span:not(.sr-only) { display: none; }
  .header__contact .btn { padding: .5rem .75rem; }
}

/* ---------- Hero ---------- */
.hero { padding: 3.5rem 0 var(--section-y); }
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  grid-template-areas: "text form" "image form";
  gap: 2rem 4rem; align-items: start;
}
.hero__text { grid-area: text; min-width: 0; }
.hero__form { grid-area: form; min-width: 0; }
.hero__image { grid-area: image; }
.hero__text .lead { margin-bottom: 1.5rem; }
.trust { list-style: none; display: flex; flex-wrap: wrap; gap: .5rem .75rem; margin-bottom: 2rem; }
.trust li {
  background: var(--color-tint); border-radius: var(--radius);
  padding: .4rem .8rem; font-size: .9rem; display: inline-flex; align-items: center; gap: .4rem;
}
.hero__image { margin: 0; }
.hero__image img { border-radius: var(--radius); width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.hero__image figcaption { font-size: .8125rem; color: var(--color-muted); margin-top: .5rem; }

@media (max-width: 991px) {
  .hero { padding-top: 2rem; }
  .hero__grid { grid-template-columns: minmax(0, 1fr); grid-template-areas: "text" "form" "image"; gap: 1.75rem; }
  .hero__text .lead { margin-bottom: 1.25rem; }
  .trust { margin-bottom: 0; }
  .hero__image img { aspect-ratio: 4 / 3; }
}
@media (max-width: 599px) {
  .hero { padding-top: 1.5rem; }
  .eyebrow { font-size: .8125rem; }
  h1 { font-size: 1.85rem; }
  .hero__text .lead { font-size: 1rem; }
  .lead__more { display: none; }
  .form-card:has(.leadform:not([data-step="1"])) .form-card__head { display: none; }
  .trust { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; }
  .trust li { font-size: .8125rem; padding: .5rem .625rem; justify-content: flex-start; }
}

/* ---------- Formular-Karte ---------- */
.form-card {
  background: var(--color-surface);
  border: 1px solid var(--color-tint);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 15px 18px -8px rgba(0,0,0,.08);
  position: sticky; top: 6.5rem;
}
@media (max-width: 991px) { .form-card { position: static; padding: 1.5rem; } }
.form-card__head p { margin-bottom: 1.25rem; font-size: .9375rem; }
.form-card__foot { font-size: .8125rem; color: var(--color-muted); margin: 1.25rem 0 0; }
.form-card__foot a { color: var(--color-text); }

#anfrage { scroll-margin-top: 5.5rem; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.progress { margin-bottom: 1.25rem; }
.progress__label { font-size: .8125rem; color: var(--color-muted); display: block; margin-bottom: .4rem; }
.progress__bar { height: 6px; background: var(--color-tint); border-radius: 3px; overflow: hidden; }
.progress__fill { height: 100%; background: var(--color-primary); transition: width .35s ease-in-out; }

.step { border: 0; padding: 0; margin: 0 0 1.25rem; min-width: 0; }
.step legend { font-weight: 700; font-size: 1.125rem; margin-bottom: .875rem; padding: 0; }

.options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .625rem; }
.options--stack { grid-template-columns: minmax(0, 1fr); }
.option { position: relative; display: block; cursor: pointer; min-width: 0; }
.option input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.option span {
  display: flex; align-items: center; justify-content: center; text-align: center;
  min-height: 3.25rem; padding: .75rem 1rem;
  background: var(--color-tint); border: 2px solid var(--color-tint); border-radius: var(--radius);
  transition: var(--transition); font-weight: 500;
  overflow-wrap: anywhere; hyphens: auto; line-height: 1.3;
}
.option:hover span { border-color: var(--color-primary); }
.option input:checked + span { border-color: var(--color-primary-dark); background: var(--color-primary-dark); color: #fff; }
.option input:focus-visible + span { outline: 3px solid var(--color-accent); outline-offset: 2px; }

.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .875rem 1rem; }
.field { min-width: 0; }
.field--full { grid-column: 1 / -1; }
.field label { display: block; font-size: .9rem; margin-bottom: .3rem; font-weight: 500; }
.field input, .field textarea {
  width: 100%; font: 1rem var(--font); color: var(--color-text);
  background: var(--color-tint); border: 1px solid var(--color-tint); border-radius: var(--radius);
  padding: .65rem .75rem; min-height: 2.75rem;
}
.field textarea { min-height: 5rem; resize: vertical; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--color-primary); background: #fff; }
.field.is-invalid input, .field.is-invalid textarea { border-color: var(--color-error); background: #fff; }
.field-error { font-size: .8125rem; color: var(--color-error); margin: .3rem 0 0; min-height: 0; }
.field-error:empty { display: none; }
.check { display: flex; gap: .625rem; align-items: flex-start; font-size: .85rem; line-height: 1.45; cursor: pointer; }
.check input { margin-top: .2rem; width: 1.125rem; height: 1.125rem; flex: none; accent-color: var(--color-primary-dark); }
@media (max-width: 599px) {
  .fields, .options { grid-template-columns: minmax(0, 1fr); }
  .option span { min-height: 3rem; padding: .7rem .9rem; }
  .form-card { padding: 1.25rem 1rem; box-shadow: none; border-color: #DCE7F3; }
  .form-card__head p { font-size: .9rem; }
  .step legend { font-size: 1.0625rem; }
  .form-nav { flex-wrap: wrap; }
  .form-nav [data-prev] { flex: 0 0 auto; }
  .form-nav [data-submit] { flex: 1 1 100%; }
}

.form-nav { display: flex; gap: .75rem; align-items: center; margin-top: .5rem; }
.form-nav [data-next], .form-nav [data-submit] { flex: 1; }
.form-msg { border-radius: var(--radius); padding: .75rem 1rem; font-size: .9375rem; margin: 0 0 1rem; }
.form-msg--error { background: #FBEAE8; color: var(--color-error); }
.btn[disabled] { opacity: .6; cursor: progress; }

.form-success { text-align: center; padding: 1rem 0; }
.form-success__icon {
  width: 3.5rem; height: 3.5rem; border-radius: 50%; margin: 0 auto 1rem;
  background: var(--color-success); color: #fff; display: grid; place-items: center; font-size: 1.75rem; font-weight: 700;
}

/* ---------- Was Sie erwartet ---------- */
.expect { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin-top: 2rem; }
.expect li { padding-left: 2rem; position: relative; font-size: .9875rem; }
.expect li::before {
  content: "✓"; position: absolute; left: 0; top: -.1rem;
  width: 1.5rem; height: 1.5rem; border-radius: 50%; background: var(--color-primary); color: #fff;
  font-size: .85rem; display: grid; place-items: center;
}
@media (max-width: 991px) { .expect { grid-template-columns: 1fr 1fr; } }
@media (max-width: 599px) { .expect { grid-template-columns: 1fr; gap: 1rem; margin-top: 1.25rem; } .expect li { font-size: .9375rem; } }

/* ---------- Karten ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.cards--3 { grid-template-columns: repeat(3, 1fr); }
.card { background: var(--color-tint); border-radius: var(--radius); padding: 1.75rem; }
.card h3 { font-size: 1.25rem; margin-bottom: .625rem; }
.card p { margin: 0; font-size: .9875rem; }
@media (max-width: 991px) { .cards, .cards--3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 639px) { .cards, .cards--3 { grid-template-columns: 1fr; gap: 1.25rem; } .card { padding: 1.5rem; } }

/* ---------- Split-Sektionen ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.split--reverse .split__media { order: 2; }
.split__media { margin: 0; }
.split__media img { border-radius: var(--radius); width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
@media (max-width: 991px) {
  .split { grid-template-columns: minmax(0, 1fr); gap: 1.75rem; }
  .split__media { order: 2; }
  .split--reverse .split__media { order: 2; }
  .split__media img { aspect-ratio: 16 / 10; }
}
@media (max-width: 599px) {
  .steps li { padding-left: 3rem; }
  .steps li::before { width: 2.25rem; height: 2.25rem; font-size: 1rem; }
  .steps h3, .benefits h3, .card h3 { font-size: 1.1rem; }
  .partner-logos { gap: 1.25rem; }
  .partner-logos img { width: 150px; }
}

.steps { list-style: none; counter-reset: step; display: grid; gap: 1.5rem; }
.steps li { position: relative; padding-left: 3.5rem; counter-increment: step; }
.steps li::before {
  content: counter(step); position: absolute; left: 0; top: 0;
  width: 2.5rem; height: 2.5rem; border-radius: 50%; background: var(--color-primary); color: #fff;
  font-weight: 700; font-size: 1.125rem; display: grid; place-items: center;
}
.steps h3, .benefits h3 { font-size: 1.2rem; margin-bottom: .25rem; }
.steps p, .benefits p { margin: 0; font-size: .9875rem; }

.benefits { list-style: none; display: grid; gap: 1.25rem; }
.benefits li { padding-left: 2rem; position: relative; }
.benefits li::before { content: ""; position: absolute; left: 0; top: .45rem; width: .875rem; height: .875rem; border-radius: 50%; background: var(--color-accent); }

.partner-logos { display: flex; flex-wrap: wrap; align-items: center; gap: 2rem; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--color-tint); }
.partner-logos img { width: 180px; }
.partner-text { font-size: .875rem; line-height: 1.35; color: var(--color-muted); }
.partner-text strong { color: var(--color-text); font-size: 1rem; }

/* ---------- Zitate ---------- */
.quote { margin: 0; background: var(--color-surface); border-radius: var(--radius); padding: 1.75rem; font-size: .9875rem; }
.quote p { margin-bottom: .875rem; }
.quote footer { color: var(--color-muted); font-size: .875rem; }

/* ---------- FAQ ---------- */
.faq details { background: var(--color-surface); border-radius: var(--radius); margin-bottom: .75rem; }
.faq summary {
  cursor: pointer; list-style: none; font-weight: 700; font-size: 1.0625rem;
  padding: 1.125rem 3rem 1.125rem 1.5rem; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 1.5rem; top: 50%; transform: translateY(-50%);
  font-size: 1.5rem; color: var(--color-primary); font-weight: 400; transition: transform .35s;
}
.faq details[open] summary::after { content: "–"; }
.faq details p { padding: 0 1.5rem 1.25rem; margin: 0; }
@media (max-width: 599px) {
  .faq summary { font-size: 1rem; padding: 1rem 2.75rem 1rem 1.125rem; }
  .faq summary::after { right: 1.125rem; }
  .faq details p { padding: 0 1.125rem 1.125rem; font-size: .9375rem; }
}
.faq summary:focus-visible { outline: 3px solid var(--color-accent); outline-offset: -3px; border-radius: var(--radius); }

/* ---------- CTA-Karte ---------- */
.cta-card {
  background: var(--color-tint); padding: 3rem;
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 2rem; align-items: center;
}
.cta-card p { margin: 0; }
.cta-card__actions { display: flex; flex-direction: column; gap: .75rem; }
@media (max-width: 991px) { .cta-card { grid-template-columns: 1fr; padding: 2rem; } }
@media (max-width: 599px) { .cta-card { padding: 1.5rem 1.125rem; } .cta-card__actions .btn { width: 100%; } }

/* ---------- Footer ---------- */
.footer { background: var(--color-tint); padding: 3rem 0 1.5rem; font-size: .875rem; }
.footer__inner { display: grid; grid-template-columns: 1fr .5fr; gap: 8vw; align-items: start; }
.footer img { width: 130px; margin-bottom: 1rem; }
.footer a { text-decoration: none; transition: var(--transition); }
.footer a:hover { color: var(--color-accent); }
.footer__legal { display: grid; gap: .5rem; }
.footer__copy { text-align: center; margin: 2rem 5% 0; color: var(--color-muted); font-size: .8125rem; }
@media (max-width: 767px) { .footer__inner { grid-template-columns: 1fr; gap: 1.5rem; } }

/* ---------- Sticky-Bar (nur mobil) ---------- */
.sticky-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
  display: none; gap: .5rem; padding: .625rem 4% calc(.625rem + env(safe-area-inset-bottom));
  background: rgba(255,255,255,.96); border-top: 1px solid var(--color-tint);
  backdrop-filter: blur(6px);
}
.sticky-bar .btn { flex: 1; padding: .7rem .5rem; font-size: .9375rem; }
@media (max-width: 991px) { .sticky-bar { display: flex; } }
@media (min-width: 992px) { body { padding-bottom: 0; } }
.sticky-bar.is-hidden { transform: translateY(110%); transition: transform .35s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; scroll-behavior: auto !important; }
}