:root{
  --bg:#f6f7fb;
  --panel:#ffffff;
  --text:#1b2430;
  --muted:#556270;
  --line:rgba(15, 23, 42, .12);
  --brand:#0f766e;     /* seriöses Petrol */
  --brand2:#1d4ed8;    /* Blau */
  --radius:16px;
}

*{box-sizing:border-box}
html,body{height:100%}

body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Noto Sans", Arial;
  background:
    radial-gradient(900px 500px at 10% 0%, rgba(29,78,216,.08), transparent 55%),
    radial-gradient(800px 500px at 90% 10%, rgba(15,118,110,.08), transparent 55%),
    var(--bg);
  color:var(--text);
  line-height:1.6;
}

a{color:inherit}
.container{width:min(1120px, 92%); margin:0 auto}
.muted{color:var(--muted)}
.small{font-size:.92rem}
.lead{font-size:1.08rem; color:var(--muted)}
.sr-only{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

/* Header */
.site-header{
  position:sticky; top:0; z-index:50;
  background: rgba(246,247,251,.85);
  backdrop-filter:saturate(1.2) blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 0;
  gap:14px;
}

.brand{display:flex; align-items:center; gap:12px; text-decoration:none}
.brand-mark{
  width:40px;height:40px;border-radius:14px;
  display:grid;place-items:center;
  background: linear-gradient(135deg, rgba(15,118,110,.18), rgba(29,78,216,.18));
  border:1px solid var(--line);
  font-weight:800;
  color:var(--text);
}
.brand-text{display:flex;flex-direction:column; gap:2px}
.brand-text span{font-size:.92rem; color:var(--muted)}

/* Nav */
.site-nav{display:flex; gap:8px; align-items:center}
.site-nav a{
  text-decoration:none;
  padding:10px 12px;
  border-radius:12px;
  color:var(--muted);
}
.site-nav a:hover{background:rgba(15,23,42,.05); color:var(--text)}
.site-nav a.active{
  background:rgba(15,118,110,.10);
  border:1px solid rgba(15,118,110,.22);
  color:var(--text);
}

/* Mobile toggle */
.nav-toggle{
  display:none;
  border:1px solid var(--line);
  background:rgba(15,23,42,.03);
  border-radius:14px;
  padding:10px 12px;
}
.burger{
  display:block;
  width:20px; height:14px;
  background:
    linear-gradient(var(--text),var(--text)) 0 0/20px 2px no-repeat,
    linear-gradient(var(--text),var(--text)) 0 6px/20px 2px no-repeat,
    linear-gradient(var(--text),var(--text)) 0 12px/20px 2px no-repeat;
  opacity:.85;
}

.site-main{padding-bottom:28px}

/* Sections */
.hero{padding:40px 0 10px}
.hero-grid{
  display:grid;
  grid-template-columns: 1.35fr .85fr;
  gap:18px;
  align-items:stretch;
}
h1{font-size:clamp(2rem, 3.2vw, 3rem); margin:.2rem 0 .6rem}
h2{font-size:clamp(1.45rem, 2.2vw, 2rem); margin:0 0 .8rem}

.section{padding:26px 0}
.section.alt{
  background: linear-gradient(180deg, rgba(15,23,42,.03), transparent);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}

/* Cards */
.card{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:18px;
  box-shadow: 0 10px 28px rgba(15,23,42,.07);
}
.card-title{font-weight:750; margin-bottom:10px}
.sep{border:none;border-top:1px solid var(--line); margin:14px 0}

/* Buttons */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  text-decoration:none;
  padding:11px 14px;
  border-radius:14px;
  border:1px solid var(--line);
  background:rgba(15,23,42,.03);
  color:var(--text);
  font-weight:700;
}
.btn:hover{background:rgba(15,23,42,.06)}
.btn.primary{
  border-color: rgba(15,118,110,.35);
  background: rgba(15,118,110,.12);
  color: #0b2f2c;
}

/* Badges */
.cta-row{display:flex; gap:10px; flex-wrap:wrap; margin:14px 0 10px}
.badges{display:flex; gap:8px; flex-wrap:wrap; margin-top:12px}
.badge{
  font-size:.9rem;
  color:var(--muted);
  border:1px solid var(--line);
  background:rgba(15,23,42,.02);
  padding:7px 10px;
  border-radius:999px;
}

/* Layout grids */
.grid-2{display:grid; grid-template-columns:1fr 1fr; gap:16px}
.grid-3{display:grid; grid-template-columns:repeat(3, 1fr); gap:16px}
.split{display:grid; grid-template-columns:1.1fr .9fr; gap:16px; align-items:start}

/* Lists/forms */
.checklist{margin:0; padding-left:1.1rem}
.checklist li{margin:.55rem 0}
.checklist li::marker{color:var(--brand)}

.form{display:grid; gap:12px; margin-top:10px}
label{display:grid; gap:6px; font-weight:700}
input, textarea{
  width:100%;
  border-radius:14px;
  border:1px solid var(--line);
  background:#fff;
  padding:11px 12px;
  color:var(--text);
}
input:focus, textarea:focus{outline:2px solid rgba(29,78,216,.18); border-color:rgba(29,78,216,.35)}
.req{color:var(--brand)}
.checkbox{grid-template-columns:20px 1fr; align-items:start; font-weight:600}
.checkbox input{width:18px;height:18px;margin-top:2px}

/* Honeypot hidden */
.hp{position:absolute;left:-9999px; width:1px; height:1px; overflow:hidden}

.notice{
  border-radius:14px;
  border:1px solid var(--line);
  padding:12px 12px;
  margin-top:10px;
}
.notice.success{
  border-color: rgba(15,118,110,.35);
  background: rgba(15,118,110,.10);
}
.notice.error{
  border-color: rgba(29,78,216,.35);
  background: rgba(29,78,216,.08);
}

/* Footer */
.site-footer{
  border-top:1px solid var(--line);
  padding:22px 0;
  background: rgba(255,255,255,.6);
}
.footer-grid{
  display:grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap:16px;
}
.footer-title{font-weight:800; margin-bottom:8px}
.footer-bottom{
  display:flex; gap:10px; align-items:center; flex-wrap:wrap;
  padding-top:12px; margin-top:14px;
  border-top:1px solid var(--line);
}
.dot{opacity:.6}

/* Responsive */
@media (max-width: 900px){
  .hero-grid, .grid-2, .split {grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
}
@media (max-width: 760px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;
    right:4%;
    top:64px;
    width:min(420px, 92vw);
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:6px;
    padding:10px;
    border-radius:18px;
    background: #ffffff;
    border:1px solid var(--line);
    box-shadow: 0 18px 50px rgba(15,23,42,.12);
  }
  .site-nav.open{display:flex}
  .site-nav a{padding:12px}
}