:root {
            --color-primary: #2180a3;
            --color-primary-hover: #1a6a82;
            --color-background: #f5f5f5;
            --color-surface: #ffffff;
            --color-text: #1a1a1a;
            --color-text-secondary: #555555;
            --color-accent: #e67e22;
            --color-success: #27ae60;
            --color-error: #e74c3c;
            --color-border: #dddddd;
            --color-focus: #2180a3;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            --font-family-mono: "Monaco", "Courier New", monospace;
            --font-size-sm: 14px;
            --font-size-base: 16px;
            --font-size-lg: 18px;
            --font-size-xl: 20px;
            --font-size-2xl: 24px;
            --font-size-3xl: 28px;
            --spacing-xs: 4px;
            --spacing-sm: 8px;
            --spacing-md: 16px;
            --spacing-lg: 24px;
            --spacing-xl: 32px;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-family);
            font-size: var(--font-size-base);
            line-height: 1.6;
            color: var(--color-text);
            background-color: var(--color-background);
        }

        .skip-link {
            position: absolute;
            top: -40px;
            left: 0;
            background: var(--color-primary);
            color: white;
            padding: var(--spacing-md);
            text-decoration: none;
            z-index: 100;
        }

        .skip-link:focus {
            top: 0;
        }

        header {
            background-color: var(--color-primary);
            color: white;
            padding: var(--spacing-sm) var(--spacing-md);
            min-height: 72px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 50;
        }

        .header-content {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: var(--spacing-lg);
        }

        .logo {
            font-size: var(--font-size-2xl);
            font-weight: bold;
            text-decoration: none;
            color: white;
        }

        .logo:hover, .logo:focus {
            text-decoration: underline;
            outline: 2px solid white;
            outline-offset: 2px;
        }

        nav ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            gap: var(--spacing-lg);
            flex-wrap: wrap;
        }

        nav a {
            color: white;
            text-decoration: none;
            padding: var(--spacing-sm) var(--spacing-md);
            border-radius: 4px;
            transition: background-color 0.3s ease;
        }

        nav a:hover, nav a:focus {
            background-color: var(--color-primary-hover);
            outline: 2px solid white;
            outline-offset: -2px;
        }

        .accessibility-info {
            background-color: #e8f4f8;
            border-left: 4px solid var(--color-primary);
            padding: 0;
            margin: var(--spacing-lg) auto;
            max-width: 1200px;
            border-radius: 4px;
        }

        /* Summary-Zeile: klickbarer Titel */
        .accessibility-info > summary {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            padding: var(--spacing-md);
            cursor: pointer;
            list-style: none;
            user-select: none;
        }
        .accessibility-info > summary::-webkit-details-marker { display: none; }
        .accessibility-info > summary::before {
            content: '▶';
            font-size: 0.75em;
            color: var(--color-primary);
            transition: transform 0.2s ease;
            flex-shrink: 0;
        }
        .accessibility-info[open] > summary::before {
            transform: rotate(90deg);
        }
        .accessibility-info > summary:hover,
        .accessibility-info > summary:focus-visible {
            background: rgba(33, 128, 163, 0.08);
            outline: 2px solid var(--color-primary);
            outline-offset: -2px;
        }
        .a11y-info-hint {
            font-size: var(--font-size-sm);
            color: var(--color-text-secondary);
            font-weight: normal;
        }
        .accessibility-info[open] .a11y-info-hint { display: none; }

        /* Inhalt beim Aufklappen */
        .accessibility-info-body {
            padding: 0 var(--spacing-md) var(--spacing-md);
        }

        .accessibility-info h2 {
            margin-top: 0;
            font-size: var(--font-size-lg);
        }

        /* h2 im Summary-Toggle: kein border-bottom, kein padding */
        .accessibility-info > summary h2 {
            border-bottom: none;
            padding-bottom: 0;
            margin: 0;
        }

        .accessibility-info ul {
            margin-bottom: 0;
            padding-left: var(--spacing-lg);
        }

        .accessibility-info li {
            margin-bottom: var(--spacing-sm);
        }

        main {
            max-width: 1200px;
            margin: var(--spacing-xl) auto;
            padding: 0 var(--spacing-md);
        }

        .hero {
            background: white;
            padding: var(--spacing-xl);
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
            margin-bottom: var(--spacing-xl);
        }

        h1 {
            font-size: var(--font-size-3xl);
            margin: 0 0 var(--spacing-md) 0;
            color: var(--color-primary);
        }

        h2 {
            font-size: var(--font-size-2xl);
            margin: var(--spacing-lg) 0 var(--spacing-md) 0;
            color: var(--color-primary);
            border-bottom: 2px solid var(--color-accent);
            padding-bottom: var(--spacing-md);
        }

        h3 {
            font-size: var(--font-size-lg);
            margin: var(--spacing-md) 0 var(--spacing-sm) 0;
            color: var(--color-text);
        }

        p {
            line-height: 1.8;
            margin: 0 0 var(--spacing-md) 0;
        }

        .topics-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: var(--spacing-lg);
            margin: var(--spacing-lg) 0;
        }

        .topic-card {
            background: white;
            border: 1px solid var(--color-border);
            border-radius: 8px;
            padding: var(--spacing-lg);
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
            transition: box-shadow 0.3s ease, transform 0.3s ease;
        }

        .topic-card:hover, .topic-card:focus-within {
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            transform: translateY(-2px);
        }

        .topic-card h3 {
            margin-top: 0;
        }

        .topic-card p {
            color: var(--color-text-secondary);
            font-size: var(--font-size-sm);
        }

        .topic-links {
            list-style: none;
            padding: 0;
            margin: var(--spacing-md) 0 0 0;
        }

        .topic-links li {
            margin: var(--spacing-sm) 0;
        }

        .topic-links a {
            display: inline-block;
            color: var(--color-primary);
            text-decoration: none;
            padding: var(--spacing-sm) 0;
            border-bottom: 1px solid transparent;
            transition: border-color 0.3s ease;
        }

        .topic-links a:hover, .topic-links a:focus {
            border-bottom-color: var(--color-primary);
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

        button, .btn {
            background-color: var(--color-primary);
            color: white;
            border: none;
            padding: var(--spacing-md) var(--spacing-lg);
            font-size: var(--font-size-base);
            border-radius: 4px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            text-decoration: none;
            display: inline-block;
            font-weight: 500;
        }

        button:hover, button:focus, .btn:hover, .btn:focus {
            background-color: var(--color-primary-hover);
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

        button:active, .btn:active {
            transform: scale(0.98);
        }

        .form-group {
            margin-bottom: var(--spacing-lg);
        }

        label {
            display: block;
            margin-bottom: var(--spacing-sm);
            font-weight: 500;
            color: var(--color-text);
        }

        input[type="text"], input[type="email"], input[type="search"], textarea, select {
            width: 100%;
            padding: var(--spacing-md);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            font-family: var(--font-family);
            font-size: var(--font-size-base);
            line-height: 1.6;
        }

        input[type="text"]:focus, input[type="email"]:focus, input[type="search"]:focus, textarea:focus, select:focus {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
            border-color: var(--color-primary);
        }

        textarea {
            resize: vertical;
            min-height: 120px;
        }

        .resources {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: var(--spacing-lg);
            margin: var(--spacing-xl) 0;
        }

        .resource-box {
            background: white;
            border-left: 4px solid var(--color-accent);
            padding: var(--spacing-lg);
            border-radius: 4px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
        }

        .resource-box h3 {
            margin-top: 0;
            color: var(--color-accent);
        }

        footer {
            background-color: var(--color-text);
            color: white;
            padding: var(--spacing-xl) var(--spacing-md);
            margin-top: var(--spacing-xl);
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }

        .footer-section h3 {
            color: white;
            margin-top: 0;
        }

        .footer-section a {
            color: #b0b0b0;
            text-decoration: none;
        }

        .footer-section a:hover, .footer-section a:focus {
            color: white;
            text-decoration: underline;
        }

        .footer-bottom {
            text-align: center;
            padding-top: var(--spacing-lg);
            border-top: 1px solid rgba(255, 255, 255, 0.2);
            font-size: var(--font-size-sm);
        }

        .breadcrumb {
            font-size: var(--font-size-sm);
            margin-bottom: var(--spacing-lg);
            color: var(--color-text-secondary);
            padding: var(--spacing-sm) var(--spacing-lg);
            background: var(--color-background);
        }

        .breadcrumb ol {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 4px;
        }

        .breadcrumb li {
            display: flex;
            align-items: center;
        }

        .breadcrumb li + li::before {
            content: '›';
            margin-right: 4px;
            color: var(--color-text-secondary);
        }

        .breadcrumb a {
            color: var(--color-primary);
            text-decoration: none;
        }

        .breadcrumb a:hover, .breadcrumb a:focus {
            text-decoration: underline;
        }

        *:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: var(--font-size-2xl);
            }

            h2 {
                font-size: var(--font-size-xl);
            }

            .header-content {
                flex-direction: column;
                gap: var(--spacing-md);
            }

            nav ul {
                gap: var(--spacing-md);
            }

            main {
                margin: var(--spacing-lg) auto;
            }

            .hero {
                padding: var(--spacing-lg);
            }

            .topics-grid {
                grid-template-columns: 1fr;
            }

            input[type="text"], input[type="email"], input[type="search"], textarea, select {
                font-size: 16px;
            }
        }

        @media print {
            header, footer, nav, .accessibility-info {
                display: none;
            }

            body {
                color: black;
                background: white;
            }

            a {
                text-decoration: underline;
            }
        }

        @media (prefers-contrast: more) {
            :root {
                --color-primary: #003d5c;
                --color-text: #000000;
            }

            .topic-card {
                border-width: 2px;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }

        .content-tabs {
            display: flex;
            gap: var(--spacing-sm);
            border-bottom: 2px solid var(--color-border);
            margin-bottom: var(--spacing-lg);
        }

        .tab-button {
            background: none;
            border: none;
            padding: var(--spacing-md);
            cursor: pointer;
            font-size: var(--font-size-base);
            color: var(--color-text-secondary);
            border-bottom: 3px solid transparent;
            transition: all 0.3s ease;
        }

        .tab-button.active {
            color: var(--color-primary);
            border-bottom-color: var(--color-primary);
        }

        .tab-button:hover, .tab-button:focus {
            background-color: #f0f0f0;
            outline: 2px solid var(--color-primary);
            outline-offset: -2px;
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
        }
    
        /* ===== Logo ===== */
        .logo {
          display: inline-flex !important;
          align-items: center !important;
          align-self: stretch !important;
          gap: 12px !important;
          text-decoration: none !important;
          color: #ffffff !important;
        }
        .logo-img {
          height: 56px;
          width: 56px;
          max-height: 56px;
          display: block;
          object-fit: contain;
          flex-shrink: 0;
          mix-blend-mode: multiply;
        }
        .logo-text {
          display: none;
        }

        /* ===== Screenreader ===== */
        .sr-only {
          position: absolute; width: 1px; height: 1px;
          padding: 0; margin: -1px; overflow: hidden;
          clip: rect(0,0,0,0); white-space: nowrap; border: 0;
        }

        /* ===== Accessibility Toolbar ===== */
        #a11y-toolbar {
          position: fixed; right: 0; top: 50%;
          transform: translateY(-50%);
          z-index: 9999; display: flex; align-items: stretch;
        }
        #a11y-toggle {
          background: #2180a3; color: #ffffff; border: none;
          border-radius: 0 4px 4px 0; width: 48px; min-height: 90px;
          cursor: pointer; font-size: 22px; display: flex;
          align-items: center; justify-content: center; flex-shrink: 0;
          box-shadow: -2px 0 8px rgba(0,0,0,0.3); transition: background 0.2s;
        }
        #a11y-toggle:hover, #a11y-toggle:focus {
          background: #1a6a82; outline: 3px solid #ffffff; outline-offset: -3px;
        }
        #a11y-panel {
          display: none; background: #ffffff;
          border: 2px solid #2180a3; border-right: none;
          border-radius: 8px 0 0 8px; padding: 16px 14px; width: 230px;
          max-height: 85vh; overflow-y: auto;
          box-shadow: -4px 0 20px rgba(0,0,0,0.25);
        }
        #a11y-panel.open { display: block; }
        #a11y-panel h2 {
          font-size: 14px; font-weight: 700; margin: 0 0 12px 0;
          color: #2180a3; border-bottom: 2px solid #e67e22; padding-bottom: 8px;
        }
        .a11y-group { margin-bottom: 14px; }
        .a11y-label {
          display: block; font-size: 11px; font-weight: 700; color: #555555;
          text-transform: uppercase; letter-spacing: 0.6px; margin-bottom: 5px;
        }
        .a11y-row { display: flex; gap: 4px; flex-wrap: wrap; }
        .a11y-btn {
          flex: 1; min-width: 36px; background: #f0f0f0;
          border: 1px solid #dddddd; border-radius: 4px; padding: 7px 4px;
          cursor: pointer; font-size: 12px; font-family: inherit;
          text-align: center; transition: all 0.15s; color: #1a1a1a; line-height: 1.2;
        }
        .a11y-btn:hover { background: #2180a3; color: #ffffff; border-color: #2180a3; }
        .a11y-btn:focus { outline: 2px solid #2180a3; outline-offset: 2px; }
        .a11y-btn[aria-pressed="true"] {
          background: #2180a3; color: #ffffff; border-color: #1a6a82; font-weight: 700;
        }
        hr.a11y-hr { border: none; border-top: 1px solid #eeeeee; margin: 10px 0; }
        .a11y-reset {
          display: block; width: 100%; margin-top: 6px; padding: 8px;
          background: #fff0f0; border: 1px solid #e74c3c; border-radius: 4px;
          color: #c0392b; font-size: 13px; font-weight: 700;
          font-family: inherit; cursor: pointer; text-align: center; transition: all 0.15s;
        }
        .a11y-reset:hover { background: #e74c3c; color: #ffffff; }
        .a11y-reset:focus { outline: 2px solid #c0392b; outline-offset: 2px; }

        /* Kontrast-Modus: KEIN filter (bricht position:fixed!) */
        body.a11y-contrast-high { background-color: #ffffff !important; color: #000000 !important; }
        body.a11y-contrast-high *:not(#a11y-toolbar):not(#a11y-toolbar *) {
          color: #000000 !important; background-color: #ffffff !important; border-color: #000000 !important;
        }
        body.a11y-contrast-high a:not(#a11y-toolbar a) { color: #00008B !important; text-decoration: underline !important; }
        body.a11y-contrast-high header, body.a11y-contrast-high header * { background-color: #000000 !important; color: #ffffff !important; }
        body.a11y-contrast-high footer, body.a11y-contrast-high footer * { background-color: #000000 !important; color: #ffffff !important; }

        /* Dunkel-Modus */
        body.a11y-dark { background-color: #111111 !important; color: #e8e8e8 !important; }
        body.a11y-dark header { background-color: #003050 !important; }
        body.a11y-dark .topic-card, body.a11y-dark .hero,
        body.a11y-dark .resource-box, body.a11y-dark .accessibility-info {
          background: #1e1e1e !important; color: #e8e8e8 !important; border-color: #444444 !important;
        }
        body.a11y-dark p, body.a11y-dark li,
        body.a11y-dark h1, body.a11y-dark h2, body.a11y-dark h3 { color: #e8e8e8 !important; }
        body.a11y-dark footer { background-color: #0a0a0a !important; }

        /* Dyslexie */
        body.a11y-dyslexia * {
          font-family: Arial, Helvetica, sans-serif !important;
          letter-spacing: 0.12em !important; word-spacing: 0.18em !important; line-height: 2.0 !important;
        }

        /* Leselinie */
        #a11y-reading-line {
          position: fixed; left: 0; width: 100%; height: 40px;
          background: rgba(255,220,0,0.3);
          border-top: 2px solid rgba(230,126,34,0.8);
          border-bottom: 2px solid rgba(230,126,34,0.8);
          pointer-events: none; z-index: 9998; display: none;
        }
        body.a11y-readguide #a11y-reading-line { display: block; }

        @media (max-width: 768px) {
          #a11y-toolbar { top: auto; bottom: 16px; transform: none; flex-direction: column-reverse; align-items: flex-end; }
          #a11y-toggle { border-radius: 50%; width: 52px; height: 52px; min-height: auto; }
          #a11y-panel { position: fixed; bottom: 80px; right: 10px; border-radius: 8px; border: 2px solid #2180a3; width: 240px; max-height: 70vh; }
        }

        
/* ═══════════════════════════════════════════════════════════════
   BLOG – F-005
   ═══════════════════════════════════════════════════════════════ */

/* Blog-Übersichtsseite */
.blog-header {
  background: var(--color-primary);
  color: #fff;
  padding: var(--spacing-xl) var(--spacing-lg);
  text-align: center;
}
.blog-header h1 { font-size: var(--font-size-xxl); margin-bottom: var(--spacing-sm); }
.blog-header p  { font-size: var(--font-size-lg); opacity: 0.9; }

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  padding: var(--spacing-xl) var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.blog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.blog-card:hover, .blog-card:focus-within {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.blog-card__body  { padding: var(--spacing-lg); flex: 1; display: flex; flex-direction: column; gap: var(--spacing-sm); }
.blog-card__meta  { display: flex; align-items: center; gap: var(--spacing-sm); flex-wrap: wrap; font-size: var(--font-size-sm); color: var(--color-text-secondary); }
.blog-card__category {
  background: var(--color-primary);
  color: #fff;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
}
.blog-card__readtime { margin-left: auto; }
.blog-card__title { font-size: var(--font-size-lg); font-weight: 700; color: var(--color-text); line-height: 1.3; margin: 0; }
.blog-card__excerpt { color: var(--color-text-secondary); line-height: 1.6; flex: 1; }
.blog-card__link {
  display: inline-block;
  margin-top: var(--spacing-sm);
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  align-self: flex-start;
}
.blog-card__link:hover, .blog-card__link:focus { color: var(--color-primary-hover); }

/* Artikel-Einzelseite */
.article-header {
  background: var(--color-primary);
  color: #fff;
  padding: var(--spacing-xl) var(--spacing-lg);
}
.article-header h1 { font-size: var(--font-size-xxl); margin-bottom: var(--spacing-sm); line-height: 1.25; }
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  align-items: center;
  font-size: var(--font-size-sm);
  opacity: 0.9;
  margin-top: var(--spacing-md);
}
.article-meta__category {
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.5);
  padding: 2px 10px;
  border-radius: 20px;
  font-weight: 600;
}

.article-content {
  max-width: 780px;
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-lg);
  line-height: 1.8;
  font-size: var(--font-size-base);
  color: var(--color-text);
}
.article-content h2 { font-size: var(--font-size-xl); color: var(--color-primary); margin: var(--spacing-xl) 0 var(--spacing-md); }
.article-content h3 { font-size: var(--font-size-lg); color: var(--color-text); margin: var(--spacing-lg) 0 var(--spacing-sm); }
.article-content p  { margin-bottom: var(--spacing-md); }
.article-content ul, .article-content ol { margin: 0 0 var(--spacing-md) var(--spacing-lg); }
.article-content li { margin-bottom: var(--spacing-xs); line-height: 1.7; }

/* Verwandte Artikel */
.related-posts {
  background: var(--color-background);
  padding: var(--spacing-xl) var(--spacing-lg);
  margin-top: var(--spacing-xl);
}
.related-posts h2 { font-size: var(--font-size-xl); color: var(--color-primary); margin-bottom: var(--spacing-lg); text-align: center; }
.related-posts__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
}

@media (max-width: 600px) {
  .blog-grid { padding: var(--spacing-md); gap: var(--spacing-md); }
  .article-content { padding: 0 var(--spacing-md); }
  .article-header { padding: var(--spacing-lg) var(--spacing-md); }
  .article-header h1 { font-size: var(--font-size-xl); }
}