:root {
  --bg: #050607;
  --panel: rgba(16, 18, 20, 0.9);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f5f5f5;
  --muted: #b8bdc4;
  --orange: #ff6507;
  --orange-2: #ff9c20;
  --cyan: #47e9ff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  overflow-x: clip;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 76% 12%, rgba(255, 101, 7, 0.17), transparent 31rem),
    radial-gradient(circle at 12% 15%, rgba(71, 233, 255, 0.08), transparent 27rem),
    linear-gradient(140deg, #050607 0%, #090c0f 54%, #030303 100%);
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { display: block; max-width: 100%; }

.site-shell {
  width: min(1240px, calc(100% - 28px));
  margin: 10px auto;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(4, 5, 6, 0.8);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.58);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 86px;
  padding: 18px 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(5, 6, 7, 0.9);
  backdrop-filter: blur(18px);
}

.brand, .footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 230px;
}
.brand-icon { width: 46px; height: 46px; flex: 0 0 auto; object-fit: contain; }
.brand-wordmark {
  display: grid;
  grid-template-columns: auto auto;
  align-items: end;
  color: #f5f5f5;
  font-size: 1.27rem;
  font-weight: 900;
  line-height: .95;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.brand-wordmark span { color: var(--orange); }
.brand-wordmark small {
  grid-column: 1 / -1;
  justify-self: center;
  margin-top: 3px;
  color: #f5f5f5;
  font-size: .71rem;
  letter-spacing: .13em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 25px;
  font-size: .79rem;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.nav a { position: relative; color: #e6e8ea; }
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -8px;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), var(--orange-2));
  transition: right .22s ease;
}
.nav a:hover::after, .nav a:focus-visible::after { right: 0; }

.nav-cta, .primary-button, .secondary-button, .mail-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border-radius: 12px;
  font-weight: 900;
  letter-spacing: .035em;
  text-align: center;
  text-transform: uppercase;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
.nav-cta {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 12px 19px;
  border: 1px solid var(--orange);
  color: #fff;
  font-size: .75rem;
  background: rgba(255, 101, 7, .06);
}
.nav-cta:hover, .primary-button:hover, .secondary-button:hover, .mail-link:hover { transform: translateY(-2px); }
.menu-toggle { display: none; }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(400px, 1.08fr);
  gap: 42px;
  align-items: center;
  min-height: 690px;
  padding: 70px 68px 98px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: auto -8% 0;
  height: 250px;
  border-top: 1px solid rgba(255, 101, 7, .25);
  background: linear-gradient(180deg, transparent, rgba(255, 101, 7, .09));
  transform: skewY(-3deg);
}
.hero::after {
  content: "";
  position: absolute;
  width: 380px;
  height: 380px;
  right: 6%;
  top: 18%;
  border-radius: 50%;
  background: rgba(71, 233, 255, .06);
  filter: blur(70px);
}
.hero-copy { position: relative; z-index: 3; min-width: 0; }
.eyebrow {
  margin: 0 0 17px;
  color: var(--orange-2);
  font-size: .76rem;
  font-weight: 900;
  letter-spacing: .13em;
  text-transform: uppercase;
}
h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 3.5rem);
  line-height: .98;
  letter-spacing: -.045em;
  text-transform: uppercase;
}
.hero-copy {
  container-type: inline-size;
  overflow: visible;
}
.hero-copy h1 {
  width: 100%;
  max-width: 100%;
}
.hero-title-line {
  display: block;
  width: 100%;
  white-space: nowrap;
}
.hero-title-accent { color: var(--orange); }
@supports (font-size: 1cqw) {
  .hero-copy h1 { font-size: clamp(1.6rem, 8.5cqw, 3.5rem); }
}
.lead {
  max-width: 620px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.68;
}
.hero-pills { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 25px; }
.hero-pills span {
  padding: 9px 12px;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 999px;
  background: rgba(255, 255, 255, .04);
  color: #e9ebed;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 35px; }
.primary-button {
  padding: 16px 22px;
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
  color: #fff;
  box-shadow: 0 14px 38px rgba(255, 101, 7, .25);
}
.secondary-button {
  padding: 15px 21px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .03);
  color: #eee;
}

.hero-product {
  position: relative;
  z-index: 3;
  display: grid;
  place-items: center;
  width: 100%;
  max-width: 590px;
  margin: 0 auto;
  min-width: 0;
}
.hero-product img {
  position: relative;
  z-index: 2;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  border: 1px solid rgba(255, 255, 255, .15);
  border-radius: 22px;
  object-fit: contain;
  background: #090a0b;
  box-shadow: 0 40px 100px rgba(0, 0, 0, .72), 0 0 70px rgba(255, 101, 7, .1);
}
.product-glow {
  position: absolute;
  width: 72%;
  height: 72%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 101, 7, .26), transparent 64%);
  filter: blur(35px);
}
.hero-product figcaption {
  position: absolute;
  z-index: 4;
  left: 24px;
  bottom: 24px;
  display: grid;
  gap: 4px;
  max-width: calc(100% - 48px);
  padding: 13px 15px;
  border: 1px solid rgba(255, 255, 255, .17);
  border-radius: 13px;
  background: rgba(5, 7, 8, .84);
  backdrop-filter: blur(14px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, .38);
}
.hero-product figcaption strong { font-size: .8rem; letter-spacing: .05em; text-transform: uppercase; }
.hero-product figcaption span { color: var(--cyan); font-size: .78rem; font-weight: 800; }

.feature-strip {
  position: relative;
  z-index: 5;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: -26px 42px 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(20, 22, 24, .97), rgba(9, 10, 11, .97));
}
.feature-strip article { padding: 34px 27px; text-align: center; border-right: 1px solid rgba(255, 101, 7, .25); }
.feature-strip article:last-child { border-right: 0; }
.icon { display: block; margin-bottom: 17px; color: var(--orange); font-size: 2.25rem; line-height: 1; }
.feature-strip h2, .content-grid h2, .signup h2 {
  margin: 0 0 12px;
  letter-spacing: -.04em;
  text-transform: uppercase;
}
.feature-strip h2 { font-size: 1rem; }
.feature-strip p { margin: 0; color: var(--muted); font-size: .9rem; line-height: 1.55; }

.content-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 24px;
  padding: 84px 42px 30px;
}
.panel {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 19px;
  background: var(--panel);
}
.panel.large { padding: 38px; }
.panel.large > p { color: var(--muted); line-height: 1.72; }
.content-grid h2 { font-size: clamp(1.8rem, 3vw, 3rem); }
.spec-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; margin: 29px 0 0; }
.spec-list div { padding: 17px; border: 1px solid rgba(255, 255, 255, .08); border-radius: 13px; background: rgba(255, 255, 255, .04); }
dt { margin-bottom: 7px; color: var(--orange); font-size: .74rem; font-weight: 900; text-transform: uppercase; }
dd { margin: 0; color: #fff; line-height: 1.4; }
.product-gallery-panel { padding: 18px; }
.mini-gallery {
  display: grid;
  gap: 14px;
}
.mini-gallery-stage {
  position: relative;
  min-height: 380px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 16px;
  background:
    radial-gradient(circle at 50% 20%, rgba(255,101,7,.10), transparent 40%),
    linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.01));
}
.mini-gallery-image {
  width: 100%;
  height: 100%;
  max-height: 420px;
  object-fit: contain;
  display: block;
}
.mini-gallery-caption {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 14px;
  display: grid;
  gap: 4px;
  padding: 11px 13px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 12px;
  background: rgba(5,7,8,.8);
  backdrop-filter: blur(14px);
}
.mini-gallery-caption strong {
  font-size: .8rem;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.mini-gallery-caption span {
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.45;
}
.gallery-arrow {
  position: absolute;
  top: 14px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 999px;
  background: rgba(5,7,8,.78);
  color: #fff;
  cursor: pointer;
  z-index: 2;
  font-size: 1.25rem;
  line-height: 1;
}
.gallery-arrow.prev { left: 14px; }
.gallery-arrow.next { right: 14px; }
.gallery-arrow:hover, .gallery-chip:hover {
  border-color: rgba(255,156,32,.5);
  background: rgba(255,101,7,.10);
}
.mini-gallery-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.gallery-chip {
  flex: 1 1 calc(50% - 10px);
  min-height: 42px;
  padding: 10px 12px;
  border: 1px solid rgba(255,255,255,.10);
  border-radius: 12px;
  background: rgba(255,255,255,.03);
  color: #eceff2;
  font-size: .74rem;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
  cursor: pointer;
}
.gallery-chip.is-active {
  border-color: rgba(255,101,7,.55);
  background: linear-gradient(135deg, rgba(255,101,7,.18), rgba(255,156,32,.12));
  color: #fff;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.05);
}

.notice {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  margin: 12px 42px 0;
  padding: 18px 20px;
  border: 1px solid rgba(255, 156, 32, .3);
  border-radius: 14px;
  background: rgba(255, 101, 7, .06);
}
.notice strong { color: var(--orange-2); font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; }
.notice p { margin: 0; color: var(--muted); line-height: 1.55; }

.signup {
  padding: 82px 26px 90px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  text-align: center;
  background: radial-gradient(circle at center, rgba(255, 101, 7, .11), transparent 34rem);
}
.signup h2 { font-size: clamp(2rem, 4vw, 4rem); }
.signup p { color: var(--muted); }
.mail-link {
  margin-top: 18px;
  padding: 16px 24px;
  border: 1px solid var(--orange);
  background: rgba(255, 101, 7, .08);
  color: #fff;
}

.footer {
  display: grid;
  grid-template-columns: 1.25fr .8fr .9fr .8fr;
  gap: 40px;
  padding: 46px 68px;
  border-top: 1px solid var(--line);
  background: #070809;
  color: var(--muted);
}
.footer-brand { margin-bottom: 17px; }
.footer-brand .brand-wordmark { font-size: 1.1rem; }
.footer strong { display: block; margin-bottom: 14px; color: #fff; font-size: .8rem; text-transform: uppercase; }
.footer a, .footer span { display: block; margin: 9px 0; }
.footer a:hover { color: var(--orange); }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .65s ease, transform .65s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

.legal-shell { min-height: calc(100vh - 20px); }
.legal-page { max-width: 980px; padding: 70px 68px 82px; }
.legal-page h1 { margin: 0 0 34px; font-size: clamp(2.4rem, 4.8vw, 4.8rem); }
.legal-card { margin: 18px 0; padding: 28px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
.legal-card h2 { margin: 0 0 14px; font-size: 1.25rem; letter-spacing: -.03em; text-transform: uppercase; }
.legal-card p { margin: 0 0 14px; color: var(--muted); line-height: 1.72; }
.legal-card p:last-child { margin-bottom: 0; }
.legal-card a { color: #fff; font-weight: 800; text-decoration: underline; text-decoration-color: var(--orange); text-underline-offset: 4px; }
.legal-footer { grid-template-columns: 1.3fr 1fr 1fr; }

@media (max-width: 1080px) {
  .topbar { gap: 16px; padding-inline: 22px; }
  .nav { gap: 16px; }
  .nav-cta { display: none; }
  .hero { grid-template-columns: minmax(0, .9fr) minmax(360px, 1.1fr); padding-inline: 44px; }
}

@media (max-width: 860px) {
  .site-shell { width: min(100% - 18px, 1240px); }
  .topbar { min-height: 76px; }
  .menu-toggle {
    display: grid;
    gap: 5px;
    width: 44px;
    height: 44px;
    flex: 0 0 auto;
    place-content: center;
    border: 1px solid var(--line);
    border-radius: 11px;
    background: rgba(255, 255, 255, .04);
    color: #fff;
    cursor: pointer;
  }
  .menu-toggle span { width: 21px; height: 2px; border-radius: 2px; background: currentColor; transition: transform .2s ease, opacity .2s ease; }
  .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .nav {
    position: fixed;
    top: 76px;
    right: 9px;
    left: 9px;
    display: grid;
    gap: 0;
    max-height: calc(100dvh - 88px);
    overflow-y: auto;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(6, 7, 8, .98);
    box-shadow: 0 25px 60px rgba(0, 0, 0, .55);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity .2s ease, transform .2s ease;
  }
  .nav.is-open { opacity: 1; pointer-events: auto; transform: none; }
  .nav a { min-height: 52px; padding: 17px 20px; border-bottom: 1px solid rgba(255, 255, 255, .08); }
  .nav a:last-child { border-bottom: 0; }
  .nav a::after { display: none; }
  .hero { grid-template-columns: 1fr; gap: 42px; min-height: auto; padding: 50px 25px 82px; }
  .hero-copy { max-width: 720px; }
  .hero-product { max-width: 600px; }
  .feature-strip { grid-template-columns: repeat(2, 1fr); margin-inline: 20px; }
  .feature-strip article { border-bottom: 1px solid rgba(255, 101, 7, .25); }
  .feature-strip article:nth-child(2) { border-right: 0; }
  .feature-strip article:nth-child(3), .feature-strip article:nth-child(4) { border-bottom: 0; }
  .content-grid { grid-template-columns: 1fr; padding-top: 64px; }
  .footer, .legal-footer { grid-template-columns: 1fr 1fr; padding: 38px 30px; }
  .legal-page { padding: 48px 26px 60px; }
}

@media (max-width: 560px) {
  .site-shell { width: 100%; margin: 0; border-right: 0; border-left: 0; border-radius: 0; }
  .topbar {
    min-height: 68px;
    padding: 10px max(13px, env(safe-area-inset-right)) 10px max(13px, env(safe-area-inset-left));
  }
  .brand, .footer-brand { min-width: 0; gap: 8px; }
  .brand-icon { width: 38px; height: 38px; }
  .brand-wordmark { font-size: .92rem; letter-spacing: .035em; }
  .brand-wordmark small { font-size: .6rem; }
  .menu-toggle { width: 42px; height: 42px; }
  .nav { top: 68px; right: 7px; left: 7px; max-height: calc(100dvh - 78px); }
  .hero { gap: 34px; padding: 36px 14px 64px; }
  .eyebrow { margin-bottom: 13px; font-size: .68rem; line-height: 1.45; }
  h1 { font-size: clamp(1.7rem, 8.6vw, 2.35rem); line-height: .98; }
  .lead { margin-top: 21px; font-size: .96rem; line-height: 1.58; }
  .hero-pills { gap: 7px; margin-top: 20px; }
  .hero-pills span { padding: 8px 10px; font-size: .68rem; }
  .hero-actions { gap: 10px; margin-top: 27px; }
  .hero-actions a { width: 100%; min-height: 48px; padding: 14px 16px; font-size: .82rem; }
  .hero-product { width: min(100%, 430px); }
  .hero-product img { border-radius: 16px; }
  .hero-product figcaption {
    left: 10px;
    bottom: 10px;
    max-width: calc(100% - 20px);
    padding: 9px 11px;
    border-radius: 10px;
  }
  .hero-product figcaption strong { font-size: .66rem; }
  .hero-product figcaption span { font-size: .66rem; }
  .feature-strip { grid-template-columns: 1fr; margin: -14px 10px 0; border-radius: 15px; }
  .feature-strip article { padding: 24px 20px; border-right: 0; border-bottom: 1px solid rgba(255, 101, 7, .25) !important; }
  .feature-strip article:last-child { border-bottom: 0 !important; }
  .icon { margin-bottom: 12px; font-size: 1.9rem; }
  .feature-strip p { font-size: .86rem; }
  .content-grid { gap: 16px; padding: 50px 10px 22px; }
  .panel { border-radius: 16px; }
  .panel.large { padding: 22px 18px; }
  .content-grid h2 { font-size: clamp(1.65rem, 8.6vw, 2.4rem); }
  .spec-list { grid-template-columns: 1fr; gap: 10px; margin-top: 22px; }
  .spec-list div { padding: 15px; }
  .product-gallery-panel { padding: 12px; }
  .mini-gallery-stage { min-height: 290px; }
  .mini-gallery-image { max-height: 300px; }
  .mini-gallery-caption { left: 10px; right: 10px; bottom: 10px; padding: 9px 10px; }
  .mini-gallery-caption strong { font-size: .68rem; }
  .mini-gallery-caption span { font-size: .72rem; }
  .gallery-arrow { top: 10px; width: 34px; height: 34px; }
  .gallery-arrow.prev { left: 10px; }
  .gallery-arrow.next { right: 10px; }
  .mini-gallery-controls { gap: 8px; }
  .gallery-chip { flex: 1 1 calc(50% - 8px); min-height: 40px; padding: 9px 10px; font-size: .68rem; }
  .notice { grid-template-columns: 1fr; margin-inline: 10px; padding: 16px; }
  .signup { padding: 62px 16px 70px; }
  .signup h2 { font-size: clamp(1.9rem, 10vw, 3rem); }
  .mail-link { width: 100%; max-width: 420px; padding-inline: 12px; font-size: .9rem; text-transform: none; }
  .footer, .legal-footer { grid-template-columns: 1fr; gap: 24px; padding: 32px 18px calc(32px + env(safe-area-inset-bottom)); }
  .legal-page { padding: 38px 15px 48px; }
  .legal-page h1 { font-size: clamp(2.2rem, 12vw, 3.2rem); }
  .legal-card { padding: 20px 17px; }
}

@media (max-width: 380px) {
  .brand-icon { width: 34px; height: 34px; }
  .brand-wordmark { font-size: .82rem; }
  .brand-wordmark small { font-size: .54rem; }
  .menu-toggle { width: 40px; height: 40px; }
  .hero { padding-inline: 11px; }
  h1 { font-size: clamp(1.55rem, 8.2vw, 2rem); }
  .lead { font-size: .92rem; }
  .hero-pills span { font-size: .64rem; }
  .feature-strip, .notice { margin-inline: 8px; }
  .content-grid { padding-inline: 8px; }
}

@media (orientation: landscape) and (max-height: 520px) and (max-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1fr) minmax(260px, .8fr); gap: 24px; padding: 30px 22px 50px; }
  .hero-product { max-width: 390px; }
  h1 { font-size: clamp(1.65rem, 4.9vw, 2.6rem); }
  .lead { margin-top: 16px; font-size: .9rem; }
  .hero-pills { margin-top: 14px; }
  .hero-actions { margin-top: 18px; }
  .mini-gallery-stage { min-height: 260px; }
  .mini-gallery-image { max-height: 260px; }
}

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

.brand-wordmark,
.brand-wordmark span {
  white-space: nowrap;
}

.gallery-chip:focus-visible, .gallery-arrow:focus-visible { outline: 2px solid var(--orange-2); outline-offset: 2px; }

/* Version 5: Funktionsweise, Leistung, Installation und Versorgungsmodell */
.section-heading {
  max-width: 820px;
  margin-bottom: 34px;
}
.section-heading h2,
.system-section h2,
.performance-section h2,
.installation-section h2,
.energy-section h2 {
  margin: 0 0 18px;
  font-size: clamp(2rem, 4.1vw, 4.25rem);
  line-height: 1;
  letter-spacing: -.05em;
  text-transform: uppercase;
}
.section-heading > p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.7;
}
.feature-strip .icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  margin: 0 auto 17px;
  border: 1px solid rgba(255, 101, 7, .42);
  border-radius: 12px;
  background: rgba(255, 101, 7, .08);
  color: var(--orange-2);
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .08em;
}
.system-section,
.performance-section,
.installation-section,
.energy-section {
  padding: 88px 42px;
}
.system-section {
  position: relative;
  border-top: 1px solid rgba(255,255,255,.07);
  background:
    radial-gradient(circle at 78% 18%, rgba(255,101,7,.09), transparent 25rem),
    linear-gradient(180deg, rgba(255,255,255,.012), transparent);
}
.function-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}
.function-card {
  position: relative;
  min-width: 0;
  padding: 32px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: linear-gradient(145deg, rgba(21,23,25,.97), rgba(10,11,12,.97));
}
.function-card::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  right: -70px;
  bottom: -90px;
  border-radius: 50%;
  background: rgba(255,101,7,.08);
  filter: blur(10px);
}
.function-number {
  position: absolute;
  top: 22px;
  right: 24px;
  color: rgba(255,255,255,.12);
  font-size: 2.7rem;
  font-weight: 900;
  letter-spacing: -.06em;
}
.function-icon {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  margin-bottom: 23px;
  border: 1px solid rgba(255,101,7,.35);
  border-radius: 16px;
  background: rgba(255,101,7,.08);
  color: var(--orange-2);
  font-size: 1.7rem;
}
.function-card h3,
.compatibility-card h3,
.installation-card h3,
.energy-card h3 {
  margin: 0 0 14px;
  font-size: clamp(1.3rem, 2.3vw, 2rem);
  line-height: 1.15;
  letter-spacing: -.035em;
}
.function-card > p:not(.eyebrow),
.installation-card > p,
.energy-card > p {
  margin: 0;
  color: var(--muted);
  line-height: 1.68;
}
.check-list {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.check-list li {
  position: relative;
  padding-left: 27px;
  color: #eef0f2;
  line-height: 1.5;
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--orange-2);
  font-weight: 900;
}
.hybrid-flow {
  display: grid;
  grid-template-columns: repeat(7, auto);
  align-items: center;
  gap: 12px;
  margin-top: 22px;
  padding: 22px;
  border: 1px solid rgba(255,156,32,.23);
  border-radius: 18px;
  background: rgba(255,101,7,.045);
}
.hybrid-flow > div {
  min-width: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 10px;
  align-items: center;
}
.hybrid-flow > div > span {
  grid-row: 1 / 3;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
  color: #fff;
  font-size: .74rem;
  font-weight: 900;
}
.hybrid-flow strong {
  font-size: .79rem;
  text-transform: uppercase;
  letter-spacing: .035em;
}
.hybrid-flow small {
  color: var(--muted);
  font-size: .72rem;
  line-height: 1.35;
}
.hybrid-flow > i {
  color: var(--orange-2);
  font-style: normal;
  font-size: 1.2rem;
}
.performance-section {
  border-top: 1px solid rgba(255,255,255,.07);
  border-bottom: 1px solid rgba(255,255,255,.07);
  background:
    radial-gradient(circle at 15% 75%, rgba(71,233,255,.055), transparent 24rem),
    #07090a;
}
.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.metric-card {
  min-width: 0;
  padding: 25px 20px;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: rgba(255,255,255,.03);
}
.metric-card strong {
  display: block;
  margin-bottom: 9px;
  color: #fff;
  font-size: clamp(1.4rem, 2.4vw, 2.3rem);
  line-height: 1;
  letter-spacing: -.04em;
}
.metric-card span {
  color: var(--muted);
  font-size: .78rem;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: .045em;
  text-transform: uppercase;
}
.compatibility-card {
  display: grid;
  grid-template-columns: minmax(260px, .85fr) minmax(0, 1.15fr);
  gap: 28px;
  align-items: center;
  margin-top: 18px;
  padding: 28px;
  border: 1px solid rgba(255,101,7,.24);
  border-radius: 18px;
  background: linear-gradient(120deg, rgba(255,101,7,.075), rgba(255,255,255,.025));
}
.compatibility-card h3 { margin-bottom: 0; }
.compatibility-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}
.compatibility-tags span {
  padding: 10px 12px;
  border: 1px solid rgba(255,255,255,.11);
  border-radius: 999px;
  background: rgba(255,255,255,.035);
  color: #eceff1;
  font-size: .73rem;
  font-weight: 800;
}
.installation-section {
  border-top: 1px solid rgba(255,255,255,.07);
  background:
    radial-gradient(circle at 90% 30%, rgba(255,101,7,.08), transparent 27rem),
    linear-gradient(180deg, rgba(255,255,255,.012), transparent);
}
.installation-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}
.installation-card {
  min-width: 0;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
}
.location-badge {
  display: inline-flex;
  margin-bottom: 21px;
  padding: 8px 11px;
  border: 1px solid rgba(255,101,7,.35);
  border-radius: 999px;
  background: rgba(255,101,7,.08);
  color: var(--orange-2);
  font-size: .7rem;
  font-weight: 900;
  letter-spacing: .09em;
  text-transform: uppercase;
}
.installation-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 22px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--line);
}
.installation-steps > div {
  min-width: 0;
  padding: 24px 21px;
  background: #0d0f10;
}
.installation-steps span,
.energy-card > span {
  display: block;
  margin-bottom: 14px;
  color: var(--orange-2);
  font-size: .73rem;
  font-weight: 900;
  letter-spacing: .11em;
}
.installation-steps strong {
  display: block;
  margin-bottom: 9px;
  font-size: .92rem;
  text-transform: uppercase;
}
.installation-steps p {
  margin: 0;
  color: var(--muted);
  font-size: .84rem;
  line-height: 1.55;
}
.energy-section {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 34px;
  align-items: start;
  border-top: 1px solid rgba(255,255,255,.07);
  background:
    radial-gradient(circle at 20% 20%, rgba(255,101,7,.11), transparent 26rem),
    #080a0b;
}
.energy-copy {
  position: sticky;
  top: 120px;
}
.energy-copy > p:not(.eyebrow) {
  margin: 0 0 26px;
  color: var(--muted);
  line-height: 1.72;
}
.energy-cards {
  display: grid;
  gap: 14px;
}
.energy-card {
  min-width: 0;
  padding: 27px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255,255,255,.025);
}
.energy-card.accent {
  border-color: rgba(255,101,7,.34);
  background: linear-gradient(125deg, rgba(255,101,7,.12), rgba(255,156,32,.045));
}
.energy-card h3 { font-size: 1.35rem; }
.notice {
  margin-top: 0;
}

@media (max-width: 1120px) {
  .nav { gap: 17px; font-size: .72rem; }
  .hybrid-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }
  .hybrid-flow > i { display: none; }
  .metric-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .system-section,
  .performance-section,
  .installation-section,
  .energy-section { padding: 64px 20px; }
  .function-grid,
  .installation-grid,
  .energy-section { grid-template-columns: 1fr; }
  .compatibility-card { grid-template-columns: 1fr; }
  .installation-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .energy-copy { position: static; }
}

@media (max-width: 560px) {
  .system-section,
  .performance-section,
  .installation-section,
  .energy-section { padding: 52px 10px; }
  .section-heading { margin-bottom: 25px; }
  .section-heading h2,
  .system-section h2,
  .performance-section h2,
  .installation-section h2,
  .energy-section h2 {
    font-size: clamp(1.8rem, 9.7vw, 2.85rem);
  }
  .section-heading > p:last-child { font-size: .94rem; line-height: 1.6; }
  .function-card,
  .installation-card,
  .energy-card { padding: 22px 18px; border-radius: 16px; }
  .function-number { top: 18px; right: 18px; font-size: 2.1rem; }
  .function-icon { width: 48px; height: 48px; margin-bottom: 19px; border-radius: 14px; font-size: 1.45rem; }
  .function-card h3,
  .compatibility-card h3,
  .installation-card h3,
  .energy-card h3 { font-size: 1.28rem; }
  .hybrid-flow { grid-template-columns: 1fr; padding: 14px; }
  .hybrid-flow > div { padding: 8px; }
  .metric-grid { grid-template-columns: 1fr 1fr; gap: 9px; }
  .metric-card { padding: 18px 14px; border-radius: 14px; }
  .metric-card strong { font-size: 1.3rem; }
  .metric-card span { font-size: .64rem; }
  .compatibility-card { gap: 20px; padding: 21px 17px; }
  .compatibility-tags span { font-size: .67rem; }
  .installation-steps { grid-template-columns: 1fr; }
  .installation-steps > div { padding: 20px 18px; }
  .energy-section { gap: 24px; }
}

@media (max-width: 380px) {
  .metric-grid { grid-template-columns: 1fr; }
}

scroll-margin CSS
#produkt,
#vorteile,
#funktionsweise,
#leistung,
#technik,
#installation,
#versorgung,
#kontakt { scroll-margin-top: 100px; }

/* Version 7: sichere, vollständig sichtbare Hero-Überschrift */
@supports (font-size: 1cqw) {
  .hero-copy h1 { font-size: clamp(1.6rem, 8.5cqw, 3.5rem); }
}
@media (max-width: 560px) {
  .hero-copy h1 { font-size: clamp(1.55rem, 8.35vw, 2.2rem); }
}
@media (max-width: 380px) {
  .hero-copy h1 { font-size: clamp(1.45rem, 8vw, 1.9rem); }
}


/* Version 8: Vertragsmodell, AGB, Widerruf und Vertragsdownload */
.legal-page-wide { max-width: 1080px; }
.legal-alert {
  margin: 0 0 24px;
  padding: 20px 22px;
  border: 1px solid rgba(255,156,32,.35);
  border-radius: 16px;
  background: linear-gradient(125deg, rgba(255,101,7,.12), rgba(255,156,32,.035));
}
.legal-alert strong { display: block; margin-bottom: 8px; color: var(--orange-2); font-size: .82rem; letter-spacing: .08em; text-transform: uppercase; }
.legal-alert p { margin: 0; color: var(--muted); line-height: 1.65; }
.legal-card-numbered h2 { color: #fff; }
.legal-card ul, .legal-list { margin: 14px 0 0; padding-left: 22px; color: var(--muted); line-height: 1.75; }
.legal-download-card { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.legal-download-card > div { min-width: 0; }
.legal-download-card .primary-button, .legal-download-card .secondary-button { flex: 0 0 auto; }
.contract-summary-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 16px; margin: 18px 0 26px; }
.contract-summary-card { padding: 25px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
.contract-summary-card > span { display:block; margin-bottom: 12px; color: var(--orange-2); font-size:.72rem; font-weight:900; letter-spacing:.1em; text-transform:uppercase; }
.contract-summary-card > strong { display:block; margin-bottom: 13px; font-size: clamp(1.55rem,3vw,2.4rem); line-height:1; letter-spacing:-.04em; }
.contract-summary-card p { margin:0; color:var(--muted); line-height:1.65; }
.form-preview { padding: 20px; border: 1px dashed rgba(255,255,255,.18); border-radius: 13px; background: rgba(255,255,255,.025); }
.form-preview p { color: #d9dde1; }
.compact-actions { margin-top: 22px; }
.footer { grid-template-columns: 1.25fr .8fr .85fr .9fr; }
@media (max-width: 860px) {
  .contract-summary-grid { grid-template-columns: 1fr; }
  .legal-download-card { align-items: flex-start; flex-direction: column; }
  .legal-download-card .primary-button, .legal-download-card .secondary-button { width: 100%; }
}
@media (max-width: 560px) {
  .legal-alert { padding: 17px; }
  .contract-summary-card { padding: 20px 17px; }
}

@media (max-width: 860px) {
  .footer { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer { grid-template-columns: 1fr; }
}