:root {
  --ink: #0a1c26;
  --ink-soft: #40515b;
  --paper: #f6f8f4;
  --surface: #ffffff;
  --navy: #071925;
  --navy-2: #0d2a38;
  --line: rgba(10, 28, 38, .13);
  --lime: #b8ed45;
  --lime-dark: #6b9d12;
  --amber: #ffb02e;
  --cyan: #5bd5d4;
  --shadow: 0 24px 70px rgba(5, 23, 32, .13);
  --radius: 24px;
  --radius-sm: 15px;
  --max: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.58;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  padding: .7rem 1rem;
  color: #fff;
  background: var(--navy);
  border-radius: 10px;
  transform: translateY(-150%);
}
.skip-link:focus { transform: none; }

.container { width: min(calc(100% - 36px), var(--max)); margin-inline: auto; }
.section { padding: clamp(72px, 10vw, 130px) 0; }
.section-tight { padding: clamp(46px, 7vw, 86px) 0; }
.section-dark { color: #fff; background: var(--navy); }
.section-soft { background: #edf2ec; }
.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
  gap: clamp(38px, 7vw, 90px);
  align-items: center;
}
.eyebrow {
  margin: 0 0 1rem;
  color: var(--lime-dark);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .15em;
  text-transform: uppercase;
}
.section-dark .eyebrow, .hero .eyebrow { color: var(--lime); }
h1, h2, h3 { margin: 0; line-height: 1.05; letter-spacing: -.035em; }
h1 { font-size: clamp(2.75rem, 6.4vw, 6.2rem); max-width: 16ch; }
h2 { font-size: clamp(2rem, 4.6vw, 4.25rem); max-width: 19ch; }
h3 { font-size: clamp(1.2rem, 2vw, 1.65rem); }
.lead { max-width: 66ch; margin: 1.35rem 0 0; color: var(--ink-soft); font-size: clamp(1.05rem, 1.5vw, 1.25rem); }
.section-dark .lead { color: rgba(255,255,255,.73); }
.kicker { max-width: 52ch; margin: 1.2rem 0 0; font-size: 1.05rem; }
.muted { color: var(--ink-soft); }
.fineprint { color: var(--ink-soft); font-size: .84rem; }

.topline {
  color: rgba(255,255,255,.76);
  background: #06141d;
  font-size: .78rem;
}
.topline-inner {
  display: flex;
  min-height: 34px;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.topline a { color: #fff; text-decoration: none; }
.topline-contact { display: flex; flex-wrap: wrap; gap: 1rem; }
.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(246, 248, 244, .88);
  backdrop-filter: blur(18px);
}
.nav-shell { display: flex; min-height: 76px; align-items: center; gap: 1.25rem; }
.brand {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: .72rem;
  color: var(--ink);
  text-decoration: none;
}
.brand img { width: 42px; height: 42px; object-fit: contain; }
.brand-copy { display: grid; line-height: 1; }
.brand-copy strong { font-size: 1.05rem; letter-spacing: .09em; }
.brand-copy small { margin-top: .35rem; color: var(--ink-soft); font-size: .68rem; letter-spacing: .04em; }
.nav {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: .25rem;
}
.nav a {
  padding: .7rem .8rem;
  border-radius: 10px;
  color: #263b46;
  font-size: .89rem;
  font-weight: 700;
  text-decoration: none;
}
.nav a:hover, .nav a[aria-current="page"] { color: #061923; background: #e7ede5; }
.lang-switch { display: flex; gap: .2rem; margin-left: .2rem; border-left: 1px solid var(--line); padding-left: .65rem; }
.lang-switch a { padding: .45rem .52rem; font-size: .72rem; }
.nav-cta { margin-left: .4rem; }
.menu-toggle {
  display: none;
  margin-left: auto;
  padding: .65rem .8rem;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--ink);
  background: #fff;
}

.button-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.button {
  display: inline-flex;
  min-height: 48px;
  padding: .8rem 1.15rem;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--navy);
  background: var(--lime);
  box-shadow: 0 10px 28px rgba(166, 222, 47, .2);
  font-size: .9rem;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}
.button:hover { filter: brightness(.96); transform: translateY(-1px); }
.button-secondary { color: var(--ink); border-color: var(--line); background: rgba(255,255,255,.92); box-shadow: none; }
.button-dark { color: #fff; background: var(--navy); box-shadow: none; }
.button-small { min-height: 42px; padding: .65rem .95rem; font-size: .82rem; }

.hero {
  position: relative;
  min-height: clamp(680px, 88vh, 900px);
  overflow: hidden;
  color: #fff;
  background: var(--navy);
  isolation: isolate;
}
.hero-media, .hero-media::after { position: absolute; inset: 0; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: 62% center; }
.hero-media::after {
  content: "";
  background: linear-gradient(90deg, rgba(4,17,25,.93) 0%, rgba(4,17,25,.78) 35%, rgba(4,17,25,.18) 68%, rgba(4,17,25,.08) 100%), linear-gradient(0deg, rgba(4,17,25,.42), transparent 45%);
}
.hero-inner { position: relative; z-index: 1; display: flex; min-height: inherit; padding: clamp(82px, 11vw, 136px) 0 92px; align-items: center; }
.hero-copy { width: min(690px, 68%); }
.hero h1 { text-wrap: balance; }
.hero h1 span { color: var(--lime); }
.hero .lead { color: rgba(255,255,255,.8); }
.hero .button-secondary { color: #fff; border-color: rgba(255,255,255,.3); background: rgba(10,28,38,.45); backdrop-filter: blur(8px); }
.hero-proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  width: min(680px, 100%);
  margin-top: clamp(42px, 8vh, 84px);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 18px;
  background: rgba(255,255,255,.14);
  backdrop-filter: blur(14px);
}
.hero-proof div { padding: .9rem 1rem; background: rgba(4,17,25,.48); }
.hero-proof strong { display: block; color: var(--lime); font-size: .82rem; }
.hero-proof span { color: rgba(255,255,255,.73); font-size: .75rem; }
.ai-image-label {
  position: absolute;
  z-index: 2;
  right: 18px;
  bottom: 16px;
  padding: .45rem .65rem;
  border: 1px solid rgba(255,255,255,.22);
  border-radius: 999px;
  color: rgba(255,255,255,.75);
  background: rgba(4,17,25,.58);
  font-size: .67rem;
  backdrop-filter: blur(10px);
}

.cards { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; margin-top: clamp(36px, 6vw, 62px); }
.card {
  grid-column: span 4;
  position: relative;
  min-height: 290px;
  padding: 1.55rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 16px 40px rgba(5,23,32,.06);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card-icon {
  display: grid;
  width: 48px;
  height: 48px;
  margin-bottom: 3.5rem;
  place-items: center;
  border-radius: 14px;
  color: var(--navy);
  background: var(--lime);
  font-weight: 900;
}
.card p { color: var(--ink-soft); }
.card-link { position: absolute; right: 1.55rem; bottom: 1.4rem; left: 1.55rem; font-weight: 800; text-decoration: none; }
.card-wide { grid-column: span 6; }
.card-feature { color: #fff; background: var(--navy); }
.card-feature p { color: rgba(255,255,255,.68); }
.card-feature .card-link { color: var(--lime); }

.metric-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 2rem; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--line); }
.metric { padding: clamp(1.2rem, 3vw, 2.2rem); background: var(--surface); }
.metric strong { display: block; color: var(--lime-dark); font-size: clamp(2rem, 4vw, 4.2rem); line-height: 1; letter-spacing: -.06em; }
.metric span { display: block; margin-top: .7rem; color: var(--ink-soft); font-size: .84rem; }

.process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 3.4rem; }
.process-step { padding-top: 1.4rem; border-top: 1px solid rgba(255,255,255,.24); }
.process-step span { color: var(--lime); font-size: .75rem; font-weight: 800; letter-spacing: .15em; }
.process-step h3 { margin-top: 1.6rem; }
.process-step p { color: rgba(255,255,255,.64); font-size: .9rem; }

.image-card { position: relative; overflow: hidden; border-radius: var(--radius); box-shadow: var(--shadow); }
.image-card img { width: 100%; min-height: 480px; object-fit: cover; }
.image-caption {
  position: absolute;
  right: 16px;
  bottom: 16px;
  left: 16px;
  padding: 1rem;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 16px;
  color: #fff;
  background: rgba(4,17,25,.7);
  backdrop-filter: blur(13px);
  font-size: .82rem;
}

.partner-card {
  display: grid;
  grid-template-columns: minmax(220px, .7fr) 1.3fr;
  gap: clamp(28px, 6vw, 70px);
  margin-top: 3rem;
  padding: clamp(24px, 5vw, 56px);
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}
.partner-logo { padding: 1.4rem; border: 1px solid var(--line); border-radius: 18px; background: #fff; }

.energy-bg {
  position: relative;
  overflow: hidden;
  background: #06151f url("../img/generated/voltalps-3d-energiefluss-hintergrund.webp") center/cover no-repeat;
  isolation: isolate;
}
.energy-bg::before { content: ""; position: absolute; z-index: -1; inset: 0; background: linear-gradient(90deg, rgba(4,17,25,.93), rgba(4,17,25,.5)); }
.energy-panel { width: min(720px, 100%); padding: clamp(34px, 6vw, 70px); border: 1px solid rgba(255,255,255,.15); border-radius: var(--radius); background: rgba(4,17,25,.67); backdrop-filter: blur(10px); }
.energy-panel .ai-image-label { position: static; display: inline-flex; margin-top: 1rem; }

.subhero { padding: clamp(70px, 9vw, 120px) 0 70px; color: #fff; background: var(--navy); }
.subhero h1 { max-width: 18ch; font-size: clamp(2.5rem, 5.5vw, 5rem); }
.subhero .lead { color: rgba(255,255,255,.7); }
.breadcrumb { display: flex; gap: .45rem; margin-bottom: 2.6rem; color: rgba(255,255,255,.58); font-size: .78rem; }
.breadcrumb a { color: #fff; text-decoration: none; }

.gallery { columns: 3 320px; column-gap: 18px; margin-top: 3rem; }
.gallery figure {
  display: inline-block;
  width: 100%;
  margin: 0 0 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 19px;
  background: #fff;
  break-inside: avoid;
}
.gallery img { width: 100%; height: auto; }
.gallery figcaption { padding: 1rem 1.05rem 1.1rem; color: var(--ink-soft); font-size: .82rem; }
.gallery figcaption strong { display: block; margin-bottom: .3rem; color: var(--ink); font-size: .92rem; }
.gallery-legacy { columns: 2 360px; }
.thermal-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-top: 2rem; }
.thermal-grid figure { margin: 0; padding: 8px; border-radius: 14px; background: #fff; }
.thermal-grid img { width: 100%; image-rendering: auto; border-radius: 9px; }
.thermal-grid figcaption { padding: .6rem .15rem .25rem; color: var(--ink-soft); font-size: .72rem; }

.calc-layout { display: grid; grid-template-columns: minmax(0, .9fr) minmax(420px, 1.1fr); gap: 26px; align-items: start; }
.calculator-card, .results-card { padding: clamp(22px, 4vw, 42px); border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: 0 14px 40px rgba(5,23,32,.06); }
.calc-group + .calc-group { margin-top: 1.35rem; }
.calc-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.calc-grid.three { grid-template-columns: repeat(3, 1fr); }
.calc-group label, .calc-label { display: grid; gap: .42rem; color: var(--ink-soft); font-size: .8rem; }
.calc-group label strong, .calc-label strong { color: var(--ink); }
.calc-label { grid-template-columns: 1fr auto; align-items: center; }
input[type="number"], select {
  width: 100%;
  min-height: 48px;
  padding: .7rem .8rem;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--ink);
  background: #f8faf7;
}
input[type="range"] { width: 100%; accent-color: var(--lime-dark); }
.calc-help { color: #7b898f; }
.discount-banner { display: flex; margin-bottom: 1.4rem; padding: .8rem 1rem; align-items: center; justify-content: space-between; gap: 1rem; border-radius: 14px; color: var(--navy); background: #e8fac5; font-size: .82rem; }
.discount-banner strong { font-size: 1rem; }
.result-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.result { padding: 1rem; border: 1px solid var(--line); border-radius: 14px; background: #f8faf7; }
.result small { display: block; color: var(--ink-soft); }
.result strong { display: block; margin-top: .35rem; font-size: 1.23rem; line-height: 1.2; }
.result-primary { grid-column: 1 / -1; color: #fff; background: var(--navy); }
.result-primary small { color: rgba(255,255,255,.65); }
.result-primary strong { color: var(--lime); font-size: clamp(1.55rem, 3vw, 2.35rem); }
.old-price { color: #8d9aa0; font-size: .76rem; text-decoration: line-through; }

.legal-layout { display: grid; grid-template-columns: 260px minmax(0, 760px); gap: 60px; align-items: start; }
.legal-nav { position: sticky; top: 116px; padding: 1rem; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.legal-nav a { display: block; padding: .45rem .55rem; border-radius: 8px; color: var(--ink-soft); font-size: .8rem; text-decoration: none; }
.legal-nav a:hover { color: var(--ink); background: #edf2ec; }
.legal-content section { scroll-margin-top: 120px; padding: 0 0 2.2rem; }
.legal-content section + section { padding-top: 2.2rem; border-top: 1px solid var(--line); }
.legal-content h2 { font-size: clamp(1.45rem, 3vw, 2.2rem); }
.legal-content h3 { margin-top: 1.2rem; font-size: 1.05rem; letter-spacing: -.01em; }
.legal-content p, .legal-content li { color: var(--ink-soft); }
.legal-content li + li { margin-top: .5rem; }
.legal-note { margin: 0 0 2rem; padding: 1rem 1.1rem; border-left: 4px solid var(--amber); border-radius: 0 12px 12px 0; background: #fff3d9; color: #5a461e; font-size: .86rem; }

.notice { margin-top: 2rem; padding: 1rem 1.1rem; border: 1px solid #d6e7aa; border-radius: 14px; color: #34500d; background: #f0fad8; font-size: .85rem; }
.source-list { margin-top: 1.5rem; padding: 1.1rem 1.2rem; border: 1px solid var(--line); border-radius: 15px; background: #fff; font-size: .82rem; }
.source-list a { color: #3f6c0b; }

.faq-shell { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(32px, 6vw, 84px); align-items: start; }
.faq-intro { position: sticky; top: 120px; }
.faq-list { display: grid; gap: 12px; }
.faq-list details { overflow: hidden; border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: 0 14px 40px rgba(7,25,37,.05); }
.faq-list summary { position: relative; padding: 1.15rem 3rem 1.15rem 1.2rem; color: var(--navy); font-weight: 760; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; top: 50%; right: 1.2rem; translate: 0 -50%; color: #5d790f; font-size: 1.4rem; font-weight: 500; }
.faq-list details[open] summary::after { content: "–"; }
.faq-list details p { margin: 0; padding: 0 1.2rem 1.2rem; color: var(--ink-soft); }
.faq-list details a { color: #496c09; font-weight: 700; }

.cta-band { padding: clamp(36px, 6vw, 68px) 0; color: #fff; background: var(--navy-2); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.cta-inner h2 { max-width: 18ch; font-size: clamp(1.8rem, 4vw, 3.5rem); }
.site-footer { padding: 58px 0 24px; color: rgba(255,255,255,.67); background: #041119; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 2rem; }
.footer-brand { color: #fff; }
.footer-brand .brand-copy small { color: rgba(255,255,255,.55); }
.site-footer h2 { margin: 0 0 1rem; color: #fff; font-size: .83rem; letter-spacing: .08em; text-transform: uppercase; }
.site-footer nav { display: grid; gap: .55rem; }
.site-footer nav a { color: rgba(255,255,255,.65); font-size: .83rem; text-decoration: none; }
.site-footer nav a:hover { color: var(--lime); }
.ai-disclosure { margin-top: 2.5rem; padding: 1rem 0; border-top: 1px solid rgba(255,255,255,.12); border-bottom: 1px solid rgba(255,255,255,.12); color: rgba(255,255,255,.58); font-size: .76rem; }
.footer-bottom { display: flex; margin-top: 1.2rem; justify-content: space-between; gap: 1rem; font-size: .72rem; }

@media (max-width: 1040px) {
  .nav { display: none; position: absolute; top: 76px; right: 18px; left: 18px; padding: 1rem; flex-direction: column; align-items: stretch; border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: var(--shadow); }
  .nav[data-open="true"] { display: flex; }
  .nav a { padding: .85rem; }
  .lang-switch { margin: .4rem 0 0; padding: .6rem 0 0; border-top: 1px solid var(--line); border-left: 0; }
  .nav-cta { margin: .5rem 0 0; }
  .menu-toggle { display: inline-flex; }
  .card { grid-column: span 6; }
  .card-wide { grid-column: span 6; }
  .process { grid-template-columns: repeat(2, 1fr); }
  .thermal-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 780px) {
  .topline-inner { min-height: 30px; }
  .topline-contact a:first-child { display: none; }
  .brand-copy small { display: none; }
  .section-grid, .partner-card, .calc-layout, .legal-layout, .faq-shell { grid-template-columns: 1fr; }
  .hero { min-height: 760px; }
  .hero-media img { object-position: 63% center; }
  .hero-media::after { background: linear-gradient(90deg, rgba(4,17,25,.91), rgba(4,17,25,.55)), linear-gradient(0deg, rgba(4,17,25,.7), transparent 60%); }
  .hero-copy { width: 100%; }
  .hero h1 { font-size: clamp(2.65rem, 13vw, 4.4rem); }
  .hero-proof { grid-template-columns: 1fr; }
  .card, .card-wide { grid-column: 1 / -1; }
  .metric-grid { grid-template-columns: 1fr; }
  .cta-inner { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .legal-nav { position: static; }
  .faq-intro { position: static; }
}

@media (max-width: 520px) {
  .container { width: min(calc(100% - 24px), var(--max)); }
  .topline { font-size: .68rem; }
  .nav-shell { min-height: 68px; }
  .nav { top: 70px; right: 12px; left: 12px; }
  .hero-inner { align-items: flex-start; padding-top: 68px; }
  .hero-proof { margin-top: 42px; }
  .ai-image-label { right: 10px; bottom: 10px; }
  .calc-grid, .calc-grid.three, .result-grid { grid-template-columns: 1fr; }
  .result-primary { grid-column: auto; }
  .process { grid-template-columns: 1fr; }
  .thermal-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: no-preference) {
  .card, .button { transition: transform .2s ease, box-shadow .2s ease, filter .2s ease; }
  [data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity .65s ease, transform .65s ease; }
  [data-reveal].is-visible { opacity: 1; transform: none; }
}

@media print {
  .topline, .site-header, .button-row, .cta-band, .site-footer, .legal-nav { display: none !important; }
  body { background: #fff; }
  .section, .section-tight { padding: 24px 0; }
  .legal-layout { display: block; }
}