:root{
  --gold:#EFC319;
  --gold-dark:#d4a900;
  --ink:#0e1116;
  --ink-2:#161b23;
  --ink-3:#1f2630;
  --paper:#f7f8fa;
  --white:#ffffff;
  --text:#2a313b;
  --muted:#6b7583;
  --line:#e4e8ee;
  --radius:14px;
  --shadow:0 10px 40px rgba(14,17,22,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{overflow-x:hidden}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--text);background:var(--white);line-height:1.65}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* ---------- Nav ---------- */
header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(14,17,22,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.07)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;gap:16px}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand img{height:48px;width:auto}
.brand-name{color:var(--white);font-weight:700;letter-spacing:.22em;font-size:1.05rem;white-space:nowrap}
.brand-name span{color:var(--gold)}
nav.menu{display:flex;gap:28px;align-items:center}
nav.menu a{color:#c7cdd6;font-size:.92rem;font-weight:500;letter-spacing:.04em;transition:color .2s}
nav.menu a:hover{color:var(--gold)}
.nav-right{display:flex;align-items:center;gap:16px}
.nav-cta{background:var(--gold);color:var(--ink);font-weight:700;font-size:.88rem;padding:10px 20px;border-radius:8px;transition:background .2s;white-space:nowrap}
.nav-cta:hover{background:var(--gold-dark)}
.burger{display:none;background:none;border:0;color:#fff;font-size:1.6rem;cursor:pointer}
.lang{display:flex;gap:2px;background:rgba(255,255,255,.08);border-radius:8px;padding:3px}
.lang button{background:none;border:0;color:#aab2bd;font:inherit;font-size:.8rem;font-weight:700;padding:5px 10px;border-radius:6px;cursor:pointer;letter-spacing:.04em;transition:all .15s}
.lang button:hover{color:var(--white)}
.lang button.active{background:var(--gold);color:var(--ink)}

/* ---------- Hero (Startseite) ---------- */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;color:var(--white);background:var(--ink);overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;
  background:linear-gradient(rgba(10,12,18,.62),rgba(10,12,18,.78)),url("images/hero-biodiesel-night.jpg") center/cover no-repeat}
.hero-inner{padding-top:160px;padding-bottom:110px;position:relative}
.kicker{display:inline-block;color:var(--gold);font-weight:700;letter-spacing:.28em;font-size:.8rem;text-transform:uppercase;margin-bottom:18px}
.hero h1{font-size:clamp(1.9rem,4.6vw,3.6rem);line-height:1.14;font-weight:800;max-width:860px;letter-spacing:-.01em;overflow-wrap:break-word;hyphens:manual}
.hero h1 em{color:var(--gold);font-style:normal}
.hero p{margin-top:22px;max-width:640px;font-size:1.12rem;color:#d4d9e0}
.hero-actions{margin-top:36px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:14px 30px;border-radius:9px;font-weight:700;font-size:.95rem;transition:all .2s}
.btn-gold{background:var(--gold);color:var(--ink)}
.btn-gold:hover{background:var(--gold-dark)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.4);color:var(--white)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn-dark{background:var(--ink);color:var(--white)}
.btn-dark:hover{background:var(--ink-3)}

/* ---------- Seiten-Hero (Detailseiten) ---------- */
.page-hero{position:relative;color:var(--white);padding:150px 0 80px;
  background:linear-gradient(rgba(10,12,18,.72),rgba(10,12,18,.86)),var(--page-hero-img,url("images/hero-biodiesel-night.jpg")) center/cover no-repeat}
.page-hero h1{font-size:clamp(1.8rem,3.8vw,2.9rem);line-height:1.18;font-weight:800;max-width:820px;letter-spacing:-.01em;overflow-wrap:break-word;hyphens:manual}
.page-hero p{margin-top:18px;max-width:680px;font-size:1.08rem;color:#d4d9e0}
.crumb{margin-bottom:22px;font-size:.85rem;color:#9aa3af}
.crumb a{color:var(--gold)}

/* ---------- Stats ---------- */
.stats{background:var(--ink);color:var(--white);padding:34px 0;border-top:1px solid rgba(255,255,255,.06)}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat b{display:block;font-size:1.9rem;color:var(--gold);font-weight:800}
.stat span{font-size:.86rem;color:#9aa3af;letter-spacing:.04em}

/* ---------- Sections ---------- */
section{padding:96px 0}
section.tight{padding:70px 0}
.sec-head{max-width:720px;margin-bottom:56px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-head .kicker{margin-bottom:10px}
.sec-head h2{font-size:clamp(1.7rem,3vw,2.4rem);font-weight:800;color:var(--ink);letter-spacing:-.01em}
.sec-head p{margin-top:14px;color:var(--muted);font-size:1.05rem}
.alt{background:var(--paper)}

/* ---------- About / zweispaltig ---------- */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.about-grid img{border-radius:var(--radius);box-shadow:var(--shadow)}
.about-grid h2{font-size:clamp(1.7rem,3vw,2.4rem);color:var(--ink);letter-spacing:-.01em}
.value-list{margin-top:26px;display:grid;grid-template-columns:1fr 1fr;gap:16px 32px}
.value-list li{list-style:none;position:relative;padding-left:32px;font-size:.97rem;font-weight:500}
.value-list li::before{content:"\2713";position:absolute;left:0;top:0;color:var(--gold-dark);font-weight:800}
.value-list.single{grid-template-columns:1fr}

/* ---------- Technologie-Karten ---------- */
.tech{background:var(--paper)}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.card img{height:230px;object-fit:cover;width:100%}
.card-body{padding:26px 26px 30px;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:1.18rem;color:var(--ink);margin-bottom:10px}
.card-body p{font-size:.94rem;color:var(--muted);flex:1}
.card-body .tags{margin-top:18px;display:flex;flex-wrap:wrap;gap:8px}
.tag{font-size:.74rem;font-weight:700;letter-spacing:.05em;color:var(--ink);background:#f6e9b8;border-radius:99px;padding:5px 12px}
.card-more{margin-top:20px;display:block;text-align:center;font-weight:700;font-size:.92rem;color:var(--ink);border:1.5px solid var(--gold);padding:11px 18px;border-radius:9px;transition:all .2s}
.card-more:hover{background:var(--gold)}

/* ---------- Projekte ---------- */
.project{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;padding:56px 0;border-top:1px solid var(--line)}
.project:first-of-type{border-top:0;padding-top:0}
.project img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;object-fit:cover;max-height:430px}
.project .num{font-size:.8rem;font-weight:800;letter-spacing:.24em;color:var(--gold-dark);text-transform:uppercase}
.project h3{font-size:1.55rem;color:var(--ink);margin:8px 0 6px;letter-spacing:-.01em}
.project .loc{font-size:.9rem;color:var(--muted);margin-bottom:16px}
.project p{font-size:.98rem;margin-bottom:14px}
.kpi{margin-top:20px;display:grid;grid-template-columns:1fr 1fr;gap:10px 22px}
.kpi div{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:12px 16px}
.kpi div.on-paper{background:var(--white)}
.kpi b{display:block;font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:2px}
.kpi span{font-size:.92rem;font-weight:600;color:var(--ink)}
.swap .txt{order:1}
.swap .pic{order:2}

/* ---------- Prozess-Schritte (Detailseiten) ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.step{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.step .n{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;background:var(--gold);color:var(--ink);font-weight:800;font-size:1rem;margin-bottom:14px}
.steps.two{grid-template-columns:repeat(2,1fr)}
.steps.five{grid-template-columns:repeat(5,1fr)}
.steps.five .step{padding:20px}
.steps.five .step h3{font-size:.95rem}
.steps.five .step p{font-size:.84rem}
.step .ref{display:inline-block;background:var(--gold);color:var(--ink);font-weight:800;font-size:.76rem;letter-spacing:.04em;border-radius:7px;padding:5px 12px;margin-bottom:14px}
.legal-note{margin-top:34px;text-align:center;color:var(--muted);font-size:.88rem;max-width:840px;margin-left:auto;margin-right:auto}

/* ---------- Downloads ---------- */
.downloads{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}
.downloads.center{justify-content:center}
.doc-btn{display:inline-flex;align-items:center;gap:10px;border:1.5px solid var(--gold);border-radius:10px;padding:13px 20px;font-weight:700;font-size:.92rem;color:var(--ink);background:var(--white);transition:all .2s}
.doc-btn:hover{background:var(--gold)}
.dl-note{margin-top:14px;color:var(--muted);font-size:.85rem}
.legal-note a{color:var(--gold-dark);font-weight:600}
.step h3{font-size:1.02rem;color:var(--ink);margin-bottom:8px}
.step p{font-size:.9rem;color:var(--muted)}

/* ---------- CTA-Band ---------- */
.cta-band{background:var(--gold);padding:64px 0}
.cta-band .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.cta-band h2{font-size:clamp(1.4rem,2.6vw,2rem);color:var(--ink);letter-spacing:-.01em;max-width:640px}
.cta-band p{color:rgba(14,17,22,.75);margin-top:6px;font-weight:500}

/* ---------- Galerie ---------- */
.gallery{background:var(--ink-2)}
.gallery .sec-head h2{color:var(--white)}
.g-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.g-grid.three{grid-template-columns:repeat(3,1fr)}
.g-grid a{border-radius:10px;overflow:hidden;display:block;position:relative}
.g-grid img{height:190px;width:100%;object-fit:cover;transition:transform .3s}
.g-grid a:hover img{transform:scale(1.06)}

/* ---------- Kontakt ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px}
.contact-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:36px}
.contact-card h3{color:var(--ink);margin-bottom:12px}
.contact-card p{color:var(--muted);font-size:.95rem;margin-bottom:20px}
.contact-line{display:flex;gap:14px;align-items:flex-start;margin-bottom:16px;font-size:.97rem}
.contact-line .ico{color:var(--gold-dark);font-weight:800}
form .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
input,textarea{width:100%;padding:13px 15px;border:1px solid var(--line);border-radius:9px;font:inherit;font-size:.94rem;background:var(--white);margin-bottom:14px}
input:focus,textarea:focus{outline:2px solid var(--gold);border-color:transparent}
textarea{min-height:130px;resize:vertical}

/* ---------- Footer ---------- */
footer{background:var(--ink);color:#8f98a5;padding:56px 0 32px;font-size:.9rem}
.f-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:44px;margin-bottom:40px}
.f-grid img{height:52px;margin-bottom:16px}
.f-grid h4{color:var(--white);font-size:.95rem;margin-bottom:14px;letter-spacing:.05em}
.f-grid a{display:block;margin-bottom:9px;transition:color .2s}
.f-grid a:hover{color:var(--gold)}
.f-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:.82rem}

/* ---------- Lightbox ---------- */
a.zoom{cursor:zoom-in;display:block}
.lb{position:fixed;inset:0;background:rgba(10,12,16,.94);display:none;align-items:center;justify-content:center;z-index:200;padding:30px;cursor:zoom-out}
.lb.open{display:flex}
.lb img{max-height:90vh;max-width:94vw;object-fit:contain;border-radius:8px}

@media(max-width:960px){
  .about-grid,.project,.contact-grid{grid-template-columns:1fr;gap:34px}
  .swap .txt{order:0}.swap .pic{order:0}
  .cards,.steps,.steps.two,.steps.five{grid-template-columns:1fr}
  .g-grid,.g-grid.three{grid-template-columns:repeat(2,1fr)}
  .stats .wrap{grid-template-columns:repeat(2,1fr)}
  .f-grid{grid-template-columns:1fr}
  nav.menu{display:none}
  nav.menu.open{display:flex;position:absolute;top:72px;left:0;right:0;background:var(--ink);flex-direction:column;padding:20px 24px;gap:18px;border-bottom:1px solid rgba(255,255,255,.08);align-items:flex-start}
  .burger{display:block}
  .nav-cta{display:none}
  .nav{gap:10px}
  .brand{gap:8px}
  .brand img{height:38px}
  .brand-name{font-size:.88rem;letter-spacing:.14em}
  .nav-right{gap:10px}
  .lang{padding:2px}
  .lang button{padding:4px 8px;font-size:.72rem}
  .hero-inner{padding-top:130px;padding-bottom:80px}
  .page-hero{padding:120px 0 60px}
}
@media(max-width:380px){
  .brand-name{display:none}
}

/* ---------- Dezente Animationen ---------- */
@media (prefers-reduced-motion: no-preference){
  /* Langsamer Zoom-Out auf dem Hero-Bild */
  .hero::before{transform:scale(1.06);animation:heroZoom 14s ease-out forwards}
  @keyframes heroZoom{to{transform:scale(1)}}

  /* Gestaffelter Einstieg der Hero-Inhalte */
  .hero-inner>*{opacity:0;transform:translateY(18px);animation:rise .7s ease forwards}
  .hero-inner>.kicker{animation-delay:.1s}
  .hero-inner>h1{animation-delay:.22s}
  .hero-inner>p{animation-delay:.38s}
  .hero-inner>.hero-actions{animation-delay:.52s}
  @keyframes rise{to{opacity:1;transform:none}}

  /* Scroll-Reveal (Klassen setzt app.js) */
  .reveal{opacity:0;transform:translateY(22px);transition:opacity .65s ease,transform .65s ease}
  .reveal.visible{opacity:1;transform:none}
}