/* NaturWärme Amtzell – 1:1-Nachbau */
:root{
  --bg:#eef1f4;          /* heller blau-grauer Seitenhintergrund */
  --bg-2:#e6eaee;
  --white:#fff;
  --ink:#111111;
  --ink-soft:#5b6066;
  --accent:#c1ce4a;       /* lime Akzent (Buttons, Häkchen) */
  --accent-dark:#aab63d;
  --line:#e2e6ea;
  --radius:4px;
  --radius-box:14px;
  --maxw:1200px;
  --header-h:80px;
  --font:'Instrument Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
:root{color-scheme:light}
html{scroll-behavior:smooth;scroll-padding-top:var(--header-h);color-scheme:light;background:#fff}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:72px 0}
h1,h2,h3,h4{margin:0;font-weight:600;line-height:1.25;letter-spacing:-.01em;color:var(--ink)}
h1{font-size:clamp(2.2rem,4.6vw,3.2rem)}
h2{font-size:clamp(1.6rem,3vw,2rem);line-height:1.3}
h3{font-size:1.35rem}
p{margin:0 0 1em}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;
  font-weight:600;font-size:17px;padding:15px 28px;border-radius:var(--radius);
  text-decoration:none;border:0;cursor:pointer;transition:background .15s ease,transform .15s ease}
.btn-primary{background:var(--accent);color:var(--ink)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-arrow .ico{display:inline-flex;width:30px;height:30px;border-radius:50%;background:rgba(0,0,0,.12);align-items:center;justify-content:center}
.btn-arrow .ico svg{width:16px;height:16px}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:1000;background:var(--white);
  box-shadow:0 1px 0 rgba(0,0,0,.06);isolation:isolate;padding-top:env(safe-area-inset-top,0px)}
.header-inner{position:relative;display:flex;align-items:center;gap:24px;height:var(--header-h)}
.logo{display:flex;align-items:center;text-decoration:none}
.logo img{height:68px;width:auto}
.main-nav{display:flex;align-items:center;gap:30px;position:absolute;left:50%;transform:translateX(-50%)}  /* mittig auf der Seite */
.main-nav a{text-decoration:none;font-weight:500;font-size:16px;color:var(--ink);position:relative;white-space:nowrap;padding:4px 0}
.main-nav a::after{content:"";position:absolute;left:0;right:0;bottom:-3px;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:center;transition:transform .25s ease}
.main-nav a:hover::after,.main-nav a.active::after{transform:scaleX(1)}
.has-menu{position:relative}
.has-menu>span{cursor:pointer;display:inline-flex;align-items:center;gap:5px}
.menu-caret{width:14px;height:14px}
.dropdown{position:absolute;top:calc(100% + 12px);right:0;min-width:280px;background:#fff;border:1px solid var(--line);
  border-radius:10px;box-shadow:0 18px 40px rgba(20,30,40,.12);padding:8px;opacity:0;visibility:hidden;transform:translateY(-8px);transition:.2s;
  display:flex;flex-direction:column}  /* Links untereinander */
.has-menu:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:block;text-align:left;padding:11px 14px;border-radius:7px;font-size:15px;font-weight:500}
.dropdown a:hover{background:var(--bg)}
.dropdown a::after{display:none}
.header-cta{margin-left:6px}
.nav-toggle{display:none;flex-direction:column;align-items:center;justify-content:center;width:46px;height:42px;padding:0;background:none;border:0;cursor:pointer;gap:6px;margin-left:auto}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--ink);border-radius:2px}

/* ---------- Brief ---------- */
.letter{padding:64px 0 24px}
.letter .lead{font-size:clamp(1.6rem,2.6vw,2rem);line-height:1.3;font-weight:600;margin-bottom:1em}
.letter-cols{display:grid;grid-template-columns:1fr 1fr;gap:0 46px}
.letter-cols p{margin:0 0 1em;color:var(--ink-soft)}
.letter-sign{margin-top:.4em}
.letter-sign strong{color:var(--ink)}
.letter-date{font-weight:600;color:var(--ink);margin-top:.6em}

/* ---------- Hero ---------- */
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center}
.hero h2{font-size:clamp(1.9rem,3.6vw,2.5rem);margin-bottom:.7em}
.checks{list-style:none;margin:0 0 28px;padding:0;display:flex;flex-direction:column;gap:18px}
.checks li{display:flex;gap:14px;align-items:flex-start;color:var(--ink-soft)}
.checks .ck{flex:0 0 auto;width:26px;height:26px;color:var(--accent);margin-top:2px}
.hero-figure img{width:100%;border-radius:var(--radius-box);box-shadow:0 18px 50px rgba(20,40,60,.14)}

/* ---------- Was ist Nahwärme ---------- */
.about{text-align:left}
.about .wrap{max-width:none;margin:0}
.about h2{margin-bottom:.6em}
.about p{color:var(--ink-soft)}

/* ---------- Vorteile (Karten) ---------- */
.benefits .section-head{text-align:center;max-width:760px;margin:0 auto 48px}
.benefits .section-head p{color:var(--ink-soft)}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:var(--white);border-radius:4px;padding:34px 30px;box-shadow:0 1px 4px rgba(17,17,26,.05),0 0 8px rgba(17,17,26,.1)}
.card h3{text-align:center;font-size:24px;font-weight:600;color:var(--ink);margin:0 0 16px}
.card h3::after{content:"";display:block;width:44px;height:3px;background:var(--accent);border-radius:2px;margin:12px auto 0}
.card p{margin:0;color:var(--ink-soft);font-size:16px}

/* ---------- Ihr Anschluss (Schritte) ---------- */
.steps .section-head{text-align:center;max-width:760px;margin:0 auto 44px}
.steps .section-head p{color:var(--ink-soft)}
.steps-carousel{display:flex;align-items:center;gap:14px;max-width:var(--maxw);margin:0 auto}
.sc-viewport{flex:1;overflow:hidden}
.sc-track{display:flex;gap:24px;transition:transform .45s ease}
.step-card{flex:0 0 calc((100% - 48px)/3);box-sizing:border-box;background:var(--white);border-radius:4px;
  padding:36px 30px;box-shadow:0 1px 4px rgba(17,17,26,.05),0 0 8px rgba(17,17,26,.1);
  text-align:center;opacity:.35;transition:opacity .45s ease}
.step-card.active{opacity:1}
.step-ico{display:flex;align-items:center;justify-content:center;width:64px;height:64px;border-radius:50%;background:#e7ebef;color:var(--accent-dark);margin:0 auto 20px}
.step-ico svg{width:30px;height:30px}
.step-card h3{font-size:20px;font-weight:600;margin:0 0 12px}
.step-card p{margin:0;color:var(--ink-soft);font-size:16px}
.sc-nav{flex:0 0 auto;width:44px;height:44px;border:0;background:none;cursor:pointer;color:var(--ink);display:flex;align-items:center;justify-content:center;transition:color .15s}
.sc-nav svg{width:26px;height:26px}
.sc-nav:hover{color:var(--accent-dark)}
.sc-counter{display:table;margin:26px auto 0;background:var(--ink);color:#fff;font-weight:600;font-size:14px;padding:5px 15px;border-radius:20px}

/* ---------- FAQ ---------- */
.faq .section-head{text-align:left;max-width:none;margin:0 0 40px}
.faq .section-head p{color:var(--ink-soft)}
.faq-list{max-width:none;margin:0;display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--white);border-radius:4px;box-shadow:0 1px 4px rgba(17,17,26,.05),0 0 8px rgba(17,17,26,.1);overflow:hidden}
.faq-q{width:100%;text-align:left;background:none;border:0;cursor:pointer;padding:20px 24px;font-family:inherit;
  font-size:20px;font-weight:600;color:var(--accent);display:flex;justify-content:space-between;align-items:center;gap:18px}
.faq-q .chev{flex:0 0 auto;width:22px;height:22px;color:var(--ink-soft);transition:transform .25s ease}
.faq-item.open .faq-q .chev{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a p{margin:0;padding:0 24px 22px;color:var(--ink-soft)}

/* ---------- CTA ---------- */
.cta{background:var(--white);color:var(--ink);border:2px solid var(--accent);border-radius:4px;text-align:center;padding:52px 28px;max-width:var(--maxw);margin:0 auto}
.cta h2{color:var(--ink);margin-bottom:.5em}
.cta p{color:var(--ink-soft);max-width:700px;margin:0 auto 28px}

/* ---------- Footer ---------- */
.site-footer{background:var(--bg);padding:60px 0 50px;margin-top:0}
.footer-grid{display:flex;flex-wrap:wrap;gap:40px 64px}
.footer-col h4{font-size:1.15rem;font-weight:600;color:var(--ink);margin-bottom:16px}
.footer-col a{display:block;text-decoration:none;color:var(--ink-soft);padding:5px 0;font-size:15px}
.footer-col a:hover{color:var(--accent-dark)}
.footer-logo{flex:0 0 auto}
.footer-logo img{height:120px;width:auto}
.footer-contact a,.footer-contact span{display:flex;align-items:flex-start;gap:9px;color:var(--ink-soft);font-size:15px;padding:5px 0;text-decoration:none}
.footer-contact svg{width:17px;height:17px;flex:0 0 auto;margin-top:2px}
.footer-bottom{margin-top:36px;padding-top:20px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;color:var(--ink-soft);font-size:14px}
.footer-bottom a{color:var(--ink-soft);text-decoration:none}

/* ---------- Cookie ---------- */
.cookie{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);z-index:999;width:calc(100% - 32px);max-width:880px;
  background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 20px 50px rgba(20,30,40,.18);padding:22px 24px}
.cookie.hidden{display:none}
.cookie-inner{display:flex;gap:22px;align-items:center}
.cookie-text h3{font-size:1.1rem;margin-bottom:.3em}
.cookie-text p{margin:0;font-size:14px;color:var(--ink-soft)}
.cookie-actions{display:flex;flex-direction:column;gap:10px;flex:0 0 auto}
.ck-btn{border:0;border-radius:var(--radius);padding:12px 22px;font-weight:600;font-family:inherit;cursor:pointer;font-size:15px;white-space:nowrap}
.ck-accept{background:var(--accent);color:var(--ink)}
.ck-reject,.ck-edit{background:#f0f2f4;color:var(--ink)}
.cookie-fab{position:fixed;right:18px;bottom:calc(18px + env(safe-area-inset-bottom,0px));z-index:998;width:54px;height:54px;border-radius:50%;
  background:#fff;border:1px solid var(--line);box-shadow:0 6px 20px rgba(20,30,40,.18);display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--ink)}
.cookie-fab[hidden]{display:none}
.cookie-fab svg{width:24px;height:24px}

/* ---------- Legal / Form ---------- */
.legal{background:#fff;border-radius:var(--radius-box);max-width:880px;margin:40px auto;padding:48px 46px;box-shadow:0 8px 30px rgba(30,50,70,.06)}
.legal h1{margin-bottom:.6em}
.legal h2{font-size:1.3rem;margin:1.4em 0 .4em}
.legal p{color:var(--ink-soft);margin:0 0 .8em}
.form-card{background:#fff;border-radius:var(--radius-box);max-width:680px;margin:30px auto;padding:42px 40px;box-shadow:0 8px 30px rgba(30,50,70,.06)}
.form-row{display:flex;flex-direction:column;gap:6px;margin-bottom:18px}
.form-row.two{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form-row label{font-weight:600;font-size:15px}
.form-row input,.form-row textarea{font-family:inherit;font-size:16px;padding:13px 15px;border:1.5px solid var(--line);border-radius:var(--radius);background:#fafbfc}
.form-row input:focus,.form-row textarea:focus{outline:none;border-color:var(--accent)}
.form-check{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--ink-soft);margin-bottom:20px}
.subhead{text-align:center;max-width:640px;margin:0 auto 28px;color:var(--ink-soft)}

/* ---------- Scroll-Reveal ---------- */
.js .reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.js .reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.js .reveal{opacity:1!important;transform:none!important;transition:none!important}}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .cards{grid-template-columns:1fr 1fr}
  .step-card{flex:0 0 100%}   /* Karussell: 1 Karte pro Ansicht auf Tablet/Handy */
  .steps-carousel{gap:6px}
  .hero-grid{grid-template-columns:1fr;gap:30px}
}
@media(max-width:760px){
  body{font-size:16px}
  .section{padding:52px 0}
  .main-nav{position:fixed;inset:var(--header-h) 0 auto 0;background:#fff;flex-direction:column;align-items:stretch;gap:0;
    padding:8px 0;margin:0;border-bottom:1px solid var(--line);box-shadow:0 18px 30px rgba(0,0,0,.08);
    transform:translateY(-130%);visibility:hidden;transition:transform .28s ease,visibility 0s linear .28s}
  .main-nav.open{transform:translateY(0);visibility:visible;transition:transform .28s ease}
  .main-nav a{padding:14px 24px}
  .main-nav a::after{display:none}
  .has-menu{width:100%}
  .has-menu .menu-label{display:flex;justify-content:space-between;align-items:center;padding:14px 24px;width:100%}
  .menu-caret{transition:transform .25s ease}
  .has-menu.open .menu-caret{transform:rotate(180deg)}
  /* Untermenü: standardmäßig eingeklappt, erst nach Klick ausklappen, Optionen mittig unter Downloads */
  .has-menu .dropdown{position:static;display:block;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;
    min-width:0;background:transparent;max-height:0;overflow:hidden;padding:0;transition:max-height .3s ease}
  .has-menu.open .dropdown{max-height:320px}
  .has-menu .dropdown a{text-align:center;padding:12px 24px}
  .header-cta{display:none}
  .nav-toggle{display:flex}
  .letter-cols{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
  .btn{width:100%}
  .cookie-inner{flex-direction:column;align-items:stretch;gap:16px}
  .cookie-actions{width:100%}
  .ck-btn{width:100%}
  .footer-grid{flex-direction:column;gap:28px}   /* Fußzeile: alles untereinander */
  .cta{margin:0 24px;padding:40px 22px}           /* CTA so breit wie andere Container (Rand-Abstand) */
  .legal,.form-card{padding:30px 22px;margin:24px 16px}
}
@media(max-width:560px){
  .container{padding:0 18px}
  .cta{margin:0 18px}
  .form-row.two{grid-template-columns:1fr}
}