:root {
    --bg: #0f172a;
    --muted: #94a3b8;
    --fg: #e2e8f0;
    --accent: #38bdf8;
  }

  * {
    box-sizing: border-box;
  }

  body {
    margin: 0;
    font: 16px/1.6 system-ui, Segoe UI, Roboto, sans-serif;
    background: var(--bg);
    color: var(--fg);
  }

  .wrap {
    max-width: 960px;
    margin: 0 auto;
    padding: 48px 20px;
  }

  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
  }

  h1 {
    font-size: clamp(28px, 4vw, 44px);
    margin: 24px 0 8px;
  }

  .sub {
    color: var(--muted);
    font-size: 1.1rem;
  }

  /* CTA-Button */
  .cta {
    display: inline-block;
    padding: 12px 18px;
    border: 1px solid var(--accent);
    color: var(--accent);
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s ease, color 0.2s ease;
  }

  .cta:hover {
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent);
  }

  section {
    margin: 36px 0;
  }

  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
  }

  .card {
    border: 1px solid #1f2937;
    border-radius: 14px;
    padding: 18px;
    background: rgba(255, 255, 255, 0.02);
  }

  footer {
    margin-top: 48px;
    font-size: 0.9rem;
    color: var(--muted);
  }

  footer a {
    color: inherit;
  }

  /* Links allgemein */
  a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
  }

  a:hover {
    color: #ffffff;
  }

  /* Bilder responsiv machen */
  img {
    max-width: 100%;
    height: auto;
    display: block;
  }

  /* Logo im Header */
  header img,
  header svg {
    width: clamp(120px, 28vw, 220px);
    height: auto;
    flex-shrink: 0;
  }

  /* QR-Codes */
  .qr {
    aspect-ratio: 1 / 1;      /* erzwingt Quadrat */
    object-fit: contain;      /* skaliert vollständig, ohne Zuschnitt */
    max-width: 300px;         /* Deckel wie gehabt */
    width: clamp(200px, 45vw, 300px);
    height: auto;             /* bleibt flexibel */
    padding: 8px;             /* etwas Abstand – verhindert Überdeckung */
    text-align: center;
    
    /* Schärfe-Hinweise für Browser */
    image-rendering: -webkit-optimize-contrast; /* Safari/iOS */
    image-rendering: crisp-edges;               /* andere */
  }

  /* Zentrierte Inhalte (z. B. QR-Codes in Cards) */
  .center {
    text-align: center;
  }

  /* Header-Layout auf kleineren Screens */
  @media (max-width: 768px) {
    .qr {
      max-width: 350px;
      width: clamp(220px, 70vw, 350px);
    }
    
    header {
      flex-wrap: wrap;
    }

    nav {
      flex: none;
    }
  }