:root, [data-theme="light"] {
      color-scheme: light;
      --bg: #F8FAFC;
      --section: #F1F5F9;
      --card: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border: #E2E8F0;
      --accent: #0284C7;
      --link: #0369A1;
      --gold: #D97706;
      --green: #166534;
      --error: #B91C1C;
      --shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
      --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
    }
    [data-theme="dark"] {
      color-scheme: dark;
      --bg: #0B0F17;
      --section: #0F1520;
      --card: #111827;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
      --border: #1E293B;
      --accent: #0284C7;
      --link: #7DD3FC;
      --gold: #FBBF24;
      --green: #86EFAC;
      --error: #FCA5A5;
      --shadow: none;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; scroll-padding-top: 110px; }
    body {
      background: var(--bg); color: var(--text-main);
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      line-height: 1.7; -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button, a { -webkit-tap-highlight-color: transparent; }
    button { cursor: pointer; }
    a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
      outline: 2px solid var(--accent); outline-offset: 4px;
    }
    a:hover { text-decoration: underline; text-underline-offset: 4px; }
    p, li, td { overflow-wrap: anywhere; }
    h1, h2, h3, h4 { line-height: 1.25; font-weight: 650; }
    .container { max-width: 1180px; margin: 0 auto; padding: 0 28px; }
    .icon { width: 20px; height: 20px; flex-shrink: 0; vertical-align: middle; }
    .skip-link { position: fixed; top: -100px; left: 20px; z-index: 100; padding: 12px; background: var(--card); }
    .skip-link:focus { top: 12px; }

    /* Navigation und dauerhafte Theme-Auswahl */
    header { position: sticky; top: 0; z-index: 50; background: var(--bg); border-bottom: 1px solid var(--border); }
    .nav-bar { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 80px; }
    .brand { display: flex; align-items: center; flex-shrink: 0; }
    .brand-logo { display: block; height: 48px; width: auto; }
    [data-theme="light"] .brand-logo-dark, [data-theme="dark"] .brand-logo-light { display: none; }
    .nav-links { display: flex; gap: 24px; font-size: 13px; font-weight: 550; color: var(--text-muted); }
    .nav-links a:hover { color: var(--text-main); }
    .nav-actions { display: flex; align-items: center; gap: 10px; }
    .btn-primary, .btn-cyan, .btn-outline, .theme-toggle {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 44px; padding: 10px 16px; border: 1px solid var(--border); border-radius: 6px;
      font-size: 14px; font-weight: 600; line-height: 1.5; text-align: left;
      transition: background-color 150ms ease, border-color 150ms ease;
    }
    .btn-primary, .btn-cyan { background: var(--accent); border-color: var(--accent); color: #FFFFFF; font-weight: 700; }
    .btn-primary:hover, .btn-cyan:hover { background: #0369A1; border-color: #0369A1; text-decoration: none; }
    .btn-outline, .theme-toggle { background: var(--card); color: var(--text-main); }
    .btn-outline:hover, .theme-toggle:hover { background: var(--section); border-color: var(--text-muted); text-decoration: none; }
    .theme-toggle { font-size: 12px; padding: 9px 12px; }
    .theme-toggle .icon { width: 16px; height: 16px; }
    [data-theme="light"] .theme-moon, [data-theme="dark"] .theme-sun { display: none; }
    .theme-light-label, .theme-dark-label { color: var(--text-muted); font-weight: 400; }
    [data-theme="light"] .theme-light-label, [data-theme="dark"] .theme-dark-label { color: var(--text-main); font-weight: 700; }

    /* Klarer Einstieg mit kompaktem Leistungsüberblick */
    .hero { padding-top: 88px; padding-bottom: 0; }
    .eyebrow, .section-tag { display: block; font: 12px/1.6 var(--mono); letter-spacing: 0.07em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 20px; }
    .hero-layout { display: grid; grid-template-columns: 1.65fr 1fr; align-items: start; gap: 76px; padding-bottom: 64px; }
    .hero h1 { font-size: clamp(34px, 4.2vw, 54px); line-height: 1.12; letter-spacing: -0.045em; margin-bottom: 24px; }
    .hero-intro { color: var(--text-muted); font-size: 17px; max-width: 590px; margin-bottom: 30px; }
    .hero-actions, .receipt-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-aside { border-top: 2px solid var(--text-main); padding-top: 22px; margin-top: 4px; }
    .hero-aside h2 { font-size: 15px; margin-bottom: 18px; }
    .scope-row { display: flex; align-items: start; gap: 14px; padding: 17px 0; border-bottom: 1px solid var(--border); }
    .scope-row .icon { margin-top: 3px; color: var(--link); }
    .scope-row strong { display: block; font-size: 14px; }
    .scope-row span { display: block; font-size: 13px; color: var(--text-muted); }
    .hero-meta { display: flex; flex-wrap: wrap; gap: 12px 32px; padding: 22px 0; border-top: 1px solid var(--border); font: 11px/1.7 var(--mono); color: var(--text-muted); }

    /* Kapitel, Produktdetails und IT-Leistungen */
    section { padding: 76px 0; border-top: 1px solid var(--border); }
    #projekte, #ueber-mich, #eu-werte, #datenschutz { background: var(--section); }
    .section-tag { margin-bottom: 16px; }
    .section-title { font-size: clamp(26px, 3vw, 36px); letter-spacing: -0.025em; margin-bottom: 16px; }
    .section-desc { color: var(--text-muted); max-width: 690px; margin-bottom: 36px; }
    .grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
    .card, .pillar-card, .legal-card, .service-item {
      background: var(--card); border: 1px solid var(--border); border-radius: 8px; box-shadow: var(--shadow);
    }
    .card { padding: 28px; display: flex; flex-direction: column; justify-content: space-between; }
    .app-header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
    .app-header h3 { font-size: 21px; margin-bottom: 6px; letter-spacing: -0.025em; }
    .app-platform { font: 11px/1.6 var(--mono); color: var(--text-muted); }
    .app-icon-box { width: 46px; height: 46px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; background: var(--section); border: 1px solid var(--border); border-radius: 8px; color: var(--link); }
    .app-icon-box .icon { width: 24px; height: 24px; }
    .badge-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
    .badge { padding: 4px 7px; border: 1px solid var(--border); border-radius: 6px; font: 10px/1.5 var(--mono); color: var(--text-muted); background: var(--bg); }
    .feature-list { list-style: none; margin: 24px 0 28px; font-size: 14px; color: var(--text-muted); }
    .feature-list li { border-top: 1px solid var(--border); padding: 13px 0; }
    .feature-list strong { color: var(--text-main); font-weight: 600; }
    .card-text { color: var(--text-muted); font-size: 15px; }
    .card-actions, .form-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
    .store-btn:disabled { cursor: not-allowed; opacity: 1; color: var(--text-muted); }
    .product-shot { margin: 0 0 24px; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; aspect-ratio: 16 / 10; background: var(--section); }
    .product-shot[hidden] { display: none; }
    .product-shot img { display: block; width: 100%; height: 100%; object-fit: cover; }
    .social-link { display: inline-flex; align-items: center; gap: 6px; }
    .social-link .icon { width: 16px; height: 16px; }
    code { font-family: var(--mono); font-size: 0.9em; }
    .service-intro { display: flex; justify-content: space-between; align-items: flex-end; gap: 40px; margin-bottom: 32px; }
    .service-intro h3 { font-size: 22px; margin-bottom: 12px; }
    .service-intro p { font-size: 15px; color: var(--text-muted); max-width: 640px; }
    .service-intro .card-actions { flex-shrink: 0; }
    .service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
    .service-item { padding: 24px; display: flex; flex-direction: column; }
    .service-item > .icon { color: var(--link); margin-bottom: 18px; width: 24px; height: 24px; }
    .service-kicker { font: 11px/1.6 var(--mono); letter-spacing: 0.04em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 6px; }
    .service-item h4 { font-size: 15px; margin-bottom: 10px; }
    .service-item p { font-size: 13px; color: var(--text-muted); }
    .service-note { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border); }
    .service-note strong { color: var(--text-main); font-weight: 600; }
    .service-link { margin-top: auto; padding-top: 18px; font-size: 13px; font-weight: 600; color: var(--link); }
    .partner-box { margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--border); display: flex; align-items: center; gap: 40px; }
    .partner-box h3 { font-size: 19px; margin-bottom: 12px; }
    .partner-box p { font-size: 14px; color: var(--text-muted); }
    .partner-box > a { flex-shrink: 0; }
    .partner-label { display: block; font: 11px/1.6 var(--mono); color: var(--text-muted); margin-bottom: 10px; }

    /* Originalfoto: ausschließlich runder CSS-Ausschnitt */
    .about-layout { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 64px; align-items: start; }
    .portrait { width: 200px; height: 200px; border-radius: 50%; overflow: hidden; border: 2px solid var(--border); background: var(--card); flex-shrink: 0; }
    .about-copy p { color: var(--text-muted); font-size: 15px; }
    .about-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 28px; font: 11px/1.7 var(--mono); }
    .about-facts div { border-top: 1px solid var(--border); padding-top: 14px; }
    .about-facts dt { color: var(--text-muted); margin-bottom: 4px; }
    .about-facts dd { color: var(--text-main); }
    .grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
    .pillar-card { padding: 24px; }
    .pillar-card h3 { font-size: 16px; margin-bottom: 12px; }
    .pillar-card p { color: var(--text-muted); font-size: 14px; }
    .legal-card { padding: 32px; max-width: 920px; }
    .legal-card h3 { font-size: 17px; margin: 24px 0 12px; }
    .legal-card h3:first-child { margin-top: 0; }
    .legal-card p, .legal-card ul { font-size: 14px; color: var(--text-muted); margin-bottom: 14px; }
    .legal-card ul { padding-left: 22px; }

    /* Kontakt, Versandstatus und druckbare Ticket-Bestätigung */
    .contact-layout { display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 48px; align-items: start; }
    .contact-details { color: var(--text-muted); font-size: 14px; }
    .contact-details p { margin-top: 16px; }
    .contact-details a { color: var(--link); }
    .contact-details dt { font: 11px/1.7 var(--mono); letter-spacing: 0.04em; text-transform: uppercase; }
    .contact-details dl > div { padding: 14px 0; border-top: 1px solid var(--border); }
    .contact-details dd { color: var(--text-main); font-size: 15px; }
    .legal-card a { color: var(--link); }
    .form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
    .form-group { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
    .form-group label { font-size: 13px; font-weight: 600; }
    .form-group input[type="text"], .form-group input[type="tel"], .form-group select, .form-group textarea {
      width: 100%; min-width: 0; background: var(--bg); color: var(--text-main);
      border: 1px solid var(--border); border-radius: 6px; padding: 11px 12px; font-size: 16px;
    }
    input::placeholder, textarea::placeholder { color: var(--text-muted); opacity: 1; }
    .form-group textarea { resize: vertical; min-height: 130px; }
    .priority-hint { font-size: 13px; color: var(--text-muted); }
    .priority-hint[hidden] { display: none; }
    .priority-hint a { color: var(--link); font-weight: 600; }
    .checkbox-row label { display: flex; gap: 10px; align-items: flex-start; color: var(--text-muted); font-size: 12px; font-weight: 400; cursor: pointer; }
    .checkbox-row input { width: 18px; height: 18px; flex-shrink: 0; margin-top: 2px; accent-color: var(--accent); }
    .form-status { margin-top: 16px; font-size: 14px; color: var(--text-muted); }
    .form-status:empty { display: none; }
    .form-status.error { color: var(--error); }
    .form-status.success { color: var(--green); }
    .form-fallback { margin-top: 16px; }
    .form-fallback[hidden] { display: none; }
    .form-fallback .priority-hint { margin: 12px 0 0; }
    button:disabled { cursor: wait; opacity: 0.65; }
    .copy-feedback { display: none; color: var(--green); font-size: 12px; }
    .copy-feedback.visible { display: inline-block; }
    .receipt-card { display: none; background: var(--card); }
    .receipt-card.visible { display: block; }
    .receipt-header { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
    .receipt-title { font: 12px/1.7 var(--mono); }
    .receipt-badge { color: var(--green); border: 1px solid var(--border); border-radius: 6px; padding: 4px 8px; font-size: 12px; }
    .receipt-card > p { font-size: 14px; color: var(--text-muted); margin-bottom: 20px; }
    .receipt-table { width: 100%; border-collapse: collapse; margin-bottom: 20px; table-layout: fixed; }
    .receipt-table th { text-align: left; width: 38%; padding: 8px 16px 8px 0; vertical-align: top; font-size: 12px; color: var(--text-muted); font-weight: 500; }
    .receipt-table td { padding: 8px 0; font-size: 14px; }
    .receipt-topic { color: var(--link); }
    .receipt-message-box { padding: 16px; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; margin-bottom: 20px; }
    .receipt-message-box strong { display: block; font-size: 12px; color: var(--text-muted); margin-bottom: 8px; }
    .receipt-message-box p { white-space: pre-wrap; font-size: 14px; }
    .receipt-footer { border-top: 1px solid var(--border); padding-top: 16px; font-size: 12px; color: var(--text-muted); }
    .receipt-actions { margin-top: 16px; }
    footer { border-top: 1px solid var(--border); padding: 32px 0; font-size: 12px; color: var(--text-muted); }
    .footer-layout { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 24px; }
    .footer-brand { display: flex; align-items: center; gap: 14px; }
    .footer-brand img { width: 48px; height: 48px; flex-shrink: 0; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
    .anchor-alias { display: block; scroll-margin-top: 110px; }
    @media (max-width: 1060px) {
      .nav-bar { flex-wrap: wrap; gap: 0 20px; padding-top: 16px; }
      .nav-links { order: 3; width: 100%; padding: 14px 0; }
      html { scroll-padding-top: 150px; }
      .hero-layout { gap: 40px; }
      .contact-layout { grid-template-columns: 1fr; gap: 28px; }
      .contact-layout > .card { order: -1; }
      .service-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .service-intro { flex-direction: column; align-items: flex-start; gap: 20px; }
      .contact-details dl { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0 28px; }
    }
    @media (max-width: 720px) {
      .container { padding-left: 20px; padding-right: 20px; }
      .nav-bar { gap: 0 12px; }
      .nav-actions > .btn-primary { display: none; }
      .nav-links { gap: 12px 20px; flex-wrap: wrap; font-size: 12px; }
      .theme-toggle { gap: 5px; padding: 8px; }
      .brand-logo { height: 36px; }
      .hero { padding-top: 48px; }
      .hero-layout, .grid-2, .grid-3, .about-layout, .form-grid, .service-grid { grid-template-columns: 1fr; }
      .hero-layout { gap: 36px; padding-bottom: 36px; }
      .hero-meta { gap: 8px 20px; }
      section { padding: 48px 0; }
      .card, .legal-card { padding: 22px; }
      .partner-box { flex-direction: column; align-items: flex-start; gap: 20px; }
      .about-layout { gap: 32px; }
      .about-facts { grid-template-columns: 1fr; gap: 12px; }
      .about-facts dt, .about-facts dd { display: inline; }
      .about-facts dt { margin-right: 6px; }
    }
    @media (max-width: 420px) {
      .theme-toggle .icon { display: none; }
      .app-header { align-items: flex-start; gap: 10px; }
      .app-header h3 { font-size: 19px; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { transition: none !important; }
    }
    @media print {
      body * { visibility: hidden; }
      #receipt-card, #receipt-card * { visibility: visible; }
      #receipt-card { position: absolute; top: 0; left: 0; width: 100%; padding: 24px; color: #0F172A; background: #FFFFFF; --text-muted: #475569; --bg: #F8FAFC; --border: #E2E8F0; --link: #0369A1; --gold: #92400E; --green: #166534; }
      #receipt-card .receipt-actions { display: none; }
      header { position: static; }
    }

    /* Preisseite und Seiten-Teaser */
    .price-table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; box-shadow: var(--shadow); }
    .price-table th, .price-table td { text-align: left; padding: 14px 18px; font-size: 14px; border-top: 1px solid var(--border); vertical-align: top; }
    .price-table thead th { border-top: none; font: 11px/1.7 var(--mono); letter-spacing: 0.04em; text-transform: uppercase; color: var(--text-muted); background: var(--section); }
    .price-table td.price { white-space: nowrap; font-weight: 600; }
    .price-table td.price small { display: block; font-weight: 400; color: var(--text-muted); }
    .price-note { font-size: 13px; color: var(--text-muted); margin-top: 18px; max-width: 760px; }
    .teaser-link { display: inline-block; margin-top: 18px; font-size: 14px; font-weight: 600; color: var(--link); }
    .page-head { padding: 64px 0 8px; }
    .page-head .section-title { margin-bottom: 12px; }
    .app-detail-list { list-style: none; margin: 24px 0 28px; font-size: 14px; color: var(--text-muted); }
    .app-detail-list li { border-top: 1px solid var(--border); padding: 13px 0; }
    .app-detail-list strong { color: var(--text-main); font-weight: 600; }
    .honeypot { position: absolute; left: -9999px; top: -9999px; height: 1px; width: 1px; overflow: hidden; }

    /* Klassen statt Inline-Styles (CSP: style-src 'self') */
    .svg-symbols { position: absolute; }
    .text-link { color: var(--link); }
    .footer-strong { color: var(--text-main); }
    .mt-12 { margin-top: 12px; }
    .mt-14 { margin-top: 14px; }
    .mt-20 { margin-top: 20px; }
    .mt-28 { margin-top: 28px; }
    .teaser-spaced { margin-left: 24px; }
    .mono-strong { font-family: var(--mono); font-weight: 700; }
    .portrait-img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
    .hero-sub { margin-top: -12px; margin-bottom: 24px; font-weight: 600; color: var(--text-main); font-size: 17px; }