:root {
  --bg: #F8F7F1;
  --bg-alt: #EFEDE3;
  --surface: #FFFFFF;
  --ink: #141410;
  --ink-soft: #5B5F55;
  --primary: #4B5945;
  --primary-dark: #333D2F;
  --primary-tint: #E4E8DB;
  --accent: #6C7D63;
  --accent-tint: #E4E8DB;
  --line: #DAD7C9;
  --radius-s: 4px;
  --radius-m: 10px;
  --font-display: "Space Grotesk", "Arial Narrow", Arial, sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14140F;
    --bg-alt: #1B1B14;
    --surface: #1E1E17;
    --ink: #F3F2E9;
    --ink-soft: #B3B6A5;
    --primary: #9AB08B;
    --primary-dark: #4B5945;
    --primary-tint: #262F20;
    --accent: #9AB08B;
    --accent-tint: #262F20;
    --line: #333427;
  }
}
:root[data-theme="dark"] {
  --bg: #14140F;
  --bg-alt: #1B1B14;
  --surface: #1E1E17;
  --ink: #F3F2E9;
  --ink-soft: #B3B6A5;
  --primary: #9AB08B;
  --primary-dark: #4B5945;
  --primary-tint: #262F20;
  --accent: #9AB08B;
  --accent-tint: #262F20;
  --line: #333427;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; }
a { color: inherit; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.12;
  margin: 0;
  letter-spacing: -0.01em;
}
h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); }
h3 { font-size: 1.15rem; }
p { max-width: 62ch; color: var(--ink-soft); }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: var(--radius-s);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, transform .15s ease;
}
.btn-primary { background: var(--accent); color: #FBFBF6; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--primary); transform: translateY(-1px); }

/* ---------- Motion ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s cubic-bezier(.16,.84,.44,1), transform .7s cubic-bezier(.16,.84,.44,1);
}
.reveal.is-visible { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .05s; }
.reveal.d2 { transition-delay: .12s; }
.reveal.d3 { transition-delay: .19s; }
.reveal.d4 { transition-delay: .26s; }

@keyframes heroUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.hero-anim { animation: heroUp .8s cubic-bezier(.16,.84,.44,1) both; }
.hero-anim.d1 { animation-delay: .05s; }
.hero-anim.d2 { animation-delay: .16s; }
.hero-anim.d3 { animation-delay: .27s; }
.hero-anim.d4 { animation-delay: .38s; }

.card-hover { transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.card-hover:hover { transform: translateY(-4px); box-shadow: 0 14px 28px -16px rgba(20,20,16,.22); border-color: var(--primary); }

@media (prefers-reduced-motion: reduce) {
  .reveal, .hero-anim { animation: none !important; transition: none !important; opacity: 1 !important; transform: none !important; }
  .card-hover:hover { transform: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Header ---------- */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-row { display: flex; align-items: center; justify-content: space-between; padding: 16px 0; }
.logo { display: flex; align-items: center; text-decoration: none; }
.logo img { height: 34px; width: auto; display: block; }
nav.links { display: flex; align-items: center; gap: 30px; }
nav.links a {
  position: relative;
  text-decoration: none;
  font-size: 0.94rem;
  color: var(--ink-soft);
  padding-bottom: 3px;
}
nav.links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: -1px;
  height: 1px;
  background: var(--primary);
  transition: right .25s ease;
}
nav.links a:hover { color: var(--ink); }
nav.links a:hover::after { right: 0; }
nav.links a.is-current { color: var(--ink); font-weight: 600; }
nav.links a.is-current::after { right: 0; }
.nav-cta { display: flex; align-items: center; gap: 14px; }
.phone-link { font-size: 0.9rem; font-weight: 600; text-decoration: none; color: var(--ink); white-space: nowrap; }
.menu-btn { display: none; background: none; border: 1px solid var(--line); border-radius: var(--radius-s); width: 40px; height: 40px; cursor: pointer; }
.menu-btn span, .menu-btn::before, .menu-btn::after { content: ""; display: block; width: 18px; height: 2px; background: var(--ink); margin: 4px auto; }
#mnav { display: none; flex-direction: column; align-items: flex-start; gap: 0; padding: 0 28px 20px; }
#mnav.open { display: flex; }
#mnav a { padding: 10px 0; }

@media (max-width: 860px) {
  nav.links:not(#mnav) { display: none; }
  .menu-btn { display: block; }
  .phone-link { display: none; }
}

/* ---------- Hero (home) ---------- */
.hero { padding: 72px 0 96px; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px;
  font-size: 0.82rem; color: var(--ink-soft); margin-bottom: 22px;
}
.badge .pip { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.hero h1 { font-size: clamp(2.3rem, 4.6vw, 3.6rem); max-width: 12ch; margin-bottom: 20px; }
.hero p.lead { font-size: 1.08rem; max-width: 46ch; margin-bottom: 32px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 40px; }
.trust-row { display: flex; flex-wrap: wrap; gap: 26px; }
.trust-item { display: flex; align-items: center; gap: 9px; font-size: 0.87rem; color: var(--ink-soft); }
.trust-item svg { flex: none; width: 17px; height: 17px; stroke: var(--primary); }

.diagram-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-m); padding: 28px; }
.diagram-card .diagram-label { display: flex; justify-content: space-between; font-size: 0.78rem; color: var(--ink-soft); margin-bottom: 14px; }
.flow-dot { animation: flow 3.2s linear infinite; }
@keyframes flow { to { stroke-dashoffset: -120; } }
@media (prefers-reduced-motion: reduce) { .flow-dot { animation: none; } }

@media (max-width: 860px) { .hero-grid { grid-template-columns: 1fr; } }

/* ---------- Page hero (subpages) ---------- */
.page-hero { padding: 56px 0 64px; border-bottom: 1px solid var(--line); }
.page-hero .kicker { font-size: 0.92rem; color: var(--accent); font-weight: 600; margin-bottom: 10px; }
.page-hero h1 { font-size: clamp(2rem, 4vw, 2.9rem); max-width: 18ch; margin-bottom: 16px; }
.page-hero p.lead { font-size: 1.05rem; max-width: 58ch; }
.crumb { font-size: 0.85rem; color: var(--ink-soft); margin-bottom: 18px; }
.crumb a { text-decoration: none; }
.crumb a:hover { color: var(--primary); }

/* ---------- Sections ---------- */
section { padding: 84px 0; border-bottom: 1px solid var(--line); }
.section-head { display: grid; grid-template-columns: 1fr 1.4fr; gap: 40px; margin-bottom: 52px; align-items: end; }
.section-head .kicker { font-size: 0.92rem; color: var(--accent); font-weight: 600; margin-bottom: 10px; }
@media (max-width: 760px) { .section-head { grid-template-columns: 1fr; } }

/* Leistungen (teaser + detail) */
.service-list { display: flex; flex-direction: column; }
.service-row {
  display: grid; grid-template-columns: 2fr 3fr auto; gap: 24px; align-items: center;
  padding: 26px 0; border-top: 1px solid var(--line);
}
.service-row:last-child { border-bottom: 1px solid var(--line); }
.service-row h3 { display: flex; align-items: center; gap: 12px; }
.service-row h3 svg { width: 22px; height: 22px; stroke: var(--primary); flex: none; }
.service-row p { margin: 0; font-size: 0.95rem; }
.service-row .go { justify-self: end; font-size: 0.86rem; color: var(--ink-soft); white-space: nowrap; text-decoration: none; transition: color .2s ease; }
.service-row .go:hover { color: var(--primary); }
@media (max-width: 760px) {
  .service-row { grid-template-columns: 1fr; gap: 8px; }
  .service-row .go { justify-self: start; }
}

.detail-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-m);
  padding: 32px; margin-bottom: 24px;
}
.detail-card h3 { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; font-size: 1.3rem; }
.detail-card h3 svg { width: 26px; height: 26px; stroke: var(--primary); flex: none; }
.detail-card ul { margin: 18px 0 0; padding-left: 20px; color: var(--ink-soft); font-size: 0.95rem; }
.detail-card li { margin-bottom: 6px; }

/* Vorteile */
.benefits-bg { background: var(--bg-alt); }
.benefit-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-m); overflow: hidden; }
.benefit { background: var(--surface); padding: 30px 24px; }
.benefit svg { width: 24px; height: 24px; stroke: var(--accent); margin-bottom: 18px; }
.benefit h3 { margin-bottom: 8px; font-size: 1.02rem; }
.benefit p { font-size: 0.9rem; margin: 0; }
@media (max-width: 900px) { .benefit-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 540px) { .benefit-grid { grid-template-columns: 1fr; } }

/* Ablauf */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.step { padding-right: 24px; position: relative; }
.step .num { font-family: var(--font-display); font-size: 0.95rem; color: var(--accent); font-weight: 700; display: block; margin-bottom: 14px; }
.step h3 { margin-bottom: 8px; }
.step p { font-size: 0.9rem; }
.step:not(:last-child)::after {
  content: ""; position: absolute; top: 8px; right: -1px;
  width: 1px; height: calc(100% - 30px); background: var(--line); display: none;
}
@media (min-width: 761px) { .step:not(:last-child)::after { display: block; } }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; gap: 30px; } }

/* Ueber uns */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.about-grid blockquote { margin: 24px 0 0; padding-left: 18px; border-left: 2px solid var(--accent); font-family: var(--font-display); font-size: 1.15rem; font-weight: 500; color: var(--ink); max-width: 34ch; }
.about-grid blockquote cite { display: block; margin-top: 12px; font-family: var(--font-body); font-style: normal; font-size: 0.82rem; color: var(--ink-soft); }
@media (max-width: 800px) { .about-grid { grid-template-columns: 1fr; } }

/* Kontakt */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }
.contact-info dl { display: grid; grid-template-columns: auto 1fr; gap: 10px 16px; font-size: 0.94rem; margin-top: 28px; }
.contact-info dt { color: var(--ink-soft); }
.contact-info dd { margin: 0; font-weight: 500; }
.placeholder { color: var(--accent); font-weight: 500; }
form { display: grid; gap: 14px; }
label { font-size: 0.85rem; color: var(--ink-soft); display: block; margin-bottom: 6px; }
input, textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-s);
  background: var(--surface); color: var(--ink); font-family: var(--font-body); font-size: 0.95rem;
  transition: outline-color .2s ease;
}
input:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: 1px; }
textarea { resize: vertical; min-height: 110px; }
@media (max-width: 800px) { .contact-grid { grid-template-columns: 1fr; } }

/* Referenzen / Projekte */
.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.project-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-m);
  overflow: hidden; display: flex; flex-direction: column;
}
.project-card .thumb {
  aspect-ratio: 4 / 3; background: var(--bg-alt); display: flex; align-items: center; justify-content: center;
  border-bottom: 1px solid var(--line);
}
.project-card .thumb svg { width: 42px; height: 42px; stroke: var(--accent); }
.project-card .body { padding: 22px; flex: 1; display: flex; flex-direction: column; }
.project-card .tag { font-size: 0.76rem; text-transform: none; color: var(--accent); font-weight: 600; margin-bottom: 8px; }
.project-card h3 { margin-bottom: 8px; font-size: 1.05rem; }
.project-card p { font-size: 0.9rem; margin: 0; flex: 1; }
.project-card .loc { margin-top: 14px; font-size: 0.82rem; color: var(--ink-soft); }
@media (max-width: 860px) { .project-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .project-grid { grid-template-columns: 1fr; } }

.note-box {
  background: var(--bg-alt); border: 1px dashed var(--line); border-radius: var(--radius-m);
  padding: 20px 24px; font-size: 0.9rem; color: var(--ink-soft); margin-top: 36px;
}

/* Footer */
footer { padding: 40px 0; }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 18px; align-items: center; font-size: 0.85rem; color: var(--ink-soft); }
.footer-row a { text-decoration: none; margin-right: 18px; }
.footer-row a:hover { color: var(--primary); }

:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ---------- Foto-Galerie (Referenzen) ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px;
}
.gallery-item {
  position: relative;
  display: block;
  border: none;
  padding: 0;
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
  cursor: zoom-in;
  aspect-ratio: 4 / 3;
}
.gallery-item img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform .4s cubic-bezier(.16,.84,.44,1);
}
.gallery-item:hover img { transform: scale(1.06); }
.gallery-item .tag-pill {
  position: absolute; left: 10px; bottom: 10px;
  background: color-mix(in srgb, var(--ink) 78%, transparent);
  color: #F8F7F1;
  font-size: 0.72rem; font-weight: 600;
  padding: 4px 10px; border-radius: 999px;
  opacity: 0; transform: translateY(6px);
  transition: opacity .2s ease, transform .2s ease;
}
.gallery-item:hover .tag-pill { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .gallery-item img { transition: none; }
  .gallery-item:hover img { transform: none; }
}

/* Lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(10,10,8,.92);
  display: none;
  align-items: center; justify-content: center;
  padding: 40px 20px;
}
.lightbox.is-open { display: flex; }
.lightbox figure { margin: 0; max-width: min(90vw, 1000px); text-align: center; }
.lightbox img { max-width: 100%; max-height: 74vh; border-radius: var(--radius-s); display: block; margin: 0 auto; }
.lightbox figcaption { color: #F0EFE8; font-size: 0.9rem; margin-top: 14px; }
.lightbox .lb-close, .lightbox .lb-prev, .lightbox .lb-next {
  position: absolute; background: rgba(255,255,255,.1); color: #F8F7F1;
  border: 1px solid rgba(255,255,255,.25); border-radius: 999px;
  width: 44px; height: 44px; display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 1.1rem;
}
.lightbox .lb-close { top: 20px; right: 20px; }
.lightbox .lb-prev { left: 20px; top: 50%; transform: translateY(-50%); }
.lightbox .lb-next { right: 20px; top: 50%; transform: translateY(-50%); }
.lightbox .lb-close:hover, .lightbox .lb-prev:hover, .lightbox .lb-next:hover { background: rgba(255,255,255,.22); }
@media (max-width: 640px) {
  .lightbox .lb-prev { left: 6px; }
  .lightbox .lb-next { right: 6px; }
}

/* ---------- Wärmepumpen-Rechner ---------- */
.rechner-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-m);
  padding: 40px; max-width: 760px; margin: 0 auto;
}
.rc-progress { margin-bottom: 32px; }
.rc-progress-track { height: 4px; background: var(--line); border-radius: 999px; overflow: hidden; }
.rc-progress-fill { height: 100%; background: var(--accent); border-radius: 999px; transition: width .4s cubic-bezier(.16,.84,.44,1); width: 16.6%; }
.rc-progress-label { font-size: 0.8rem; color: var(--ink-soft); margin-top: 10px; }

.rc-step { display: none; }
.rc-step.is-active { display: block; animation: heroUp .5s cubic-bezier(.16,.84,.44,1) both; }
.rc-step h2 { font-size: 1.4rem; margin-bottom: 8px; }
.rc-step .rc-hint { font-size: 0.9rem; margin-bottom: 24px; }

.rc-options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.rc-options.rc-options-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 560px) { .rc-options, .rc-options.rc-options-3 { grid-template-columns: 1fr 1fr; } }

.rc-choice {
  display: block; width: 100%; text-align: left; background: var(--bg-alt);
  border: 1.5px solid var(--line); border-radius: var(--radius-s);
  padding: 16px 18px; cursor: pointer; font-family: var(--font-body); color: var(--ink);
  transition: border-color .2s ease, background .2s ease, transform .15s ease;
}
.rc-choice strong { display: block; font-size: 0.96rem; margin-bottom: 3px; }
.rc-choice span { font-size: 0.82rem; color: var(--ink-soft); }
.rc-choice:hover { border-color: var(--primary); transform: translateY(-2px); }
.rc-choice.is-selected { border-color: var(--accent); background: var(--accent-tint); }

.rc-range-row { margin: 20px 0 8px; }
.rc-range-value { font-family: var(--font-display); font-size: 1.8rem; color: var(--ink); margin-bottom: 10px; }
.rc-range-value small { font-family: var(--font-body); font-size: 0.95rem; color: var(--ink-soft); font-weight: 400; }
input[type="range"] {
  width: 100%; -webkit-appearance: none; appearance: none;
  height: 4px; border-radius: 999px; background: var(--line); outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent); cursor: pointer; border: 3px solid var(--surface); box-shadow: 0 0 0 1px var(--line);
}
input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px; border-radius: 50%; background: var(--accent); cursor: pointer;
  border: 3px solid var(--surface); box-shadow: 0 0 0 1px var(--line);
}
.rc-range-scale { display: flex; justify-content: space-between; font-size: 0.76rem; color: var(--ink-soft); margin-top: 6px; }

.rc-nav { display: flex; justify-content: space-between; margin-top: 32px; }

.rc-result-hero { text-align: center; padding: 18px 0 28px; border-bottom: 1px solid var(--line); margin-bottom: 24px; }
.rc-result-hero .rc-kw { font-family: var(--font-display); font-size: 3.2rem; color: var(--primary-dark); line-height: 1; }
:root[data-theme="dark"] .rc-result-hero .rc-kw { color: var(--primary); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .rc-result-hero .rc-kw { color: var(--primary); } }
.rc-result-hero .rc-kw span { font-size: 1.3rem; color: var(--ink-soft); font-family: var(--font-body); }
.rc-result-hero p { margin: 10px auto 0; max-width: 46ch; }
.rc-result-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 24px; margin-bottom: 24px; }
.rc-result-grid dt { font-size: 0.78rem; color: var(--ink-soft); }
.rc-result-grid dd { margin: 2px 0 0; font-weight: 600; }
@media (max-width: 560px) { .rc-result-grid { grid-template-columns: 1fr; } }

/* ---------- Förder-Check: zusätzliche Bausteine ---------- */
.fc-check-list { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 10px; }
.fc-check-list li { display: flex; align-items: baseline; gap: 10px; font-size: 0.92rem; }
.fc-check-list .fc-mark { flex: none; width: 20px; font-weight: 700; }
.fc-mark.ok { color: var(--accent); }
.fc-mark.check { color: #C9922B; }
.fc-mark.no { color: #B4503D; }

.fc-breakdown { display: grid; gap: 10px; margin: 18px 0 26px; }
.fc-breakdown-row { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; align-items: center; font-size: 0.92rem; }
.fc-breakdown-row .fc-bar-track { grid-column: 1 / -1; height: 8px; border-radius: 999px; background: var(--line); overflow: hidden; }
.fc-breakdown-row .fc-bar-fill { height: 100%; background: var(--accent); border-radius: 999px; }
.fc-breakdown-row.is-cap .fc-bar-fill { background: var(--primary-dark); }

.fc-why { margin-top: 8px; }
.fc-why details { border-top: 1px solid var(--line); padding: 14px 0; }
.fc-why summary { cursor: pointer; font-weight: 600; font-size: 0.95rem; }
.fc-why p { margin: 10px 0 0; font-size: 0.9rem; }

.fc-support-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 20px; margin-top: 18px; }
.fc-support-grid div { display: flex; gap: 10px; font-size: 0.9rem; align-items: baseline; }
.fc-support-grid div::before { content: "✓"; color: var(--accent); font-weight: 700; }
@media (max-width: 700px) { .fc-support-grid { grid-template-columns: 1fr; } }

.fc-source-line { font-size: 0.8rem; color: var(--ink-soft); margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); }
.fc-source-line a { color: var(--primary); }