:root{
  --bg:#0f172a;
  --card:#111827;
  --text:#e5e7eb;
  --muted:#9ca3af;
  --brand:#2563eb;
  --accent:#ffffff;
}

/* Reset & Base */
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Arial,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.5
}
a{color:inherit;text-decoration:none}

/* Header */
header{position:sticky;top:0;background:rgba(17,24,39,.9);
  backdrop-filter:saturate(140%) blur(8px);border-bottom:1px solid #1f2937;z-index:10}
.wrap{max-width:1100px;margin:0 auto;padding:0 16px}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:18px}
.logo{width:75px;height:75px;border-radius:50%;background:var(--accent)}

/* //German: Numerische, einfache Navigation */
.menu{display:flex;gap:8px}
.menu a{display:inline-flex;align-items:center;justify-content:center;
  width:42px;height:36px;border:1px solid #1f2937;border-radius:10px;background:#0b1220}
.menu a:hover{border-color:var(--accent);color:var(--accent)}

/* Hero */
.hero{padding:72px 0 48px}
.hero h1{font-size:clamp(28px,5vw,40px);margin:0 0 10px;color:#e6efff}
.hero p{color:var(--muted);max-width:700px}

/* Buttons */
.cta{margin-top:20px;display:flex;gap:12px;flex-wrap:wrap}
.btn{padding:10px 16px;border-radius:10px;border:1px solid #1f2937;background:#0b1220}
.btn.primary{background:var(--brand);color:#fff;border-color:transparent;font-weight:600}

/* Sections & Cards */
section{padding:40px 0;border-top:1px solid #1f2937}
.card{background:var(--card);border:1px solid #1f2937;border-radius:14px;padding:18px}

/* Grid */
.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:16px}
.col-12{grid-column:span 12}
@media(min-width:800px){
  .col-4{grid-column:span 4}
  .col-6{grid-column:span 6}
}

/* Footer */
footer{padding:28px 0;color:var(--muted);font-size:14px;text-align:center;border-top:1px solid #1f2937}

/* //German: Tastaturfokus */
a:focus,.btn:focus{outline:2px solid var(--brand);outline-offset:2px}