:root {
        --bg: #f5f8fb;
        --surface: #ffffff;
        --surface-alt: #eef4fa;
        --text: #16324f;
        --text-soft: #50657d;
        --line: #d7e2ee;
        --primary: #0e2a47;
        --primary-2: #1c4f80;
        --accent: #d89b3d;
        --accent-dark: #ba7b18;
        --shadow-sm: 0 4px 12px rgba(14, 42, 71, 0.05);
        --shadow: 0 18px 50px rgba(14, 42, 71, 0.08);
        --radius-xl: 24px;
        --radius-lg: 16px;
        --radius-md: 12px;
        --max-w: 1180px;
      }

      * {
        box-sizing: border-box;
      }
      html {
        scroll-behavior: smooth;
      }
      body {
        margin: 0;
        padding: 0;
        font-family:
          'Inter',
          system-ui,
          -apple-system,
          sans-serif;
        background-color: var(--bg);
        color: var(--text);
        line-height: 1.6;
        -webkit-font-smoothing: antialiased;
      }

      a {
        text-decoration: none;
        color: inherit;
        transition: color 0.2s;
      }

      .container {
        max-width: var(--max-w);
        margin: 0 auto;
        padding: 0 24px;
      }

      /* --- Header --- */
      .topbar {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 24px 0;
      }

      .brand {
        display: flex;
        align-items: center;
        gap: 12px;
        font-weight: 800;
        font-size: 1.15rem;
        color: var(--primary);
      }

      .brand-mark {
        background: linear-gradient(135deg, var(--primary), var(--primary-2));
        color: #fff;
        width: 42px;
        height: 42px;
        display: flex;
        justify-content: center;
        align-items: center;
        border-radius: var(--radius-md);
        font-size: 1.1rem;
        letter-spacing: 0.5px;
        box-shadow: var(--shadow-sm);
      }

      .nav-links {
        display: flex;
        gap: 32px;
        font-weight: 600;
        color: var(--text-soft);
        font-size: 0.95rem;
      }

      .nav-links a:hover {
        color: var(--primary);
      }

      /* --- Hero Section --- */
      .hero-section {
        padding: 56px 0 80px;
      }

      .hero-grid {
        display: grid;
        grid-template-columns: 1.1fr 0.9fr;
        gap: 64px;
        align-items: center;
      }

      .eyebrow {
        display: inline-block;
        padding: 6px 16px;
        background: rgba(216, 155, 61, 0.15);
        color: var(--accent-dark);
        border-radius: 20px;
        font-weight: 700;
        font-size: 0.9rem;
        margin-bottom: 24px;
      }

      h1 {
        font-size: 3.2rem;
        line-height: 1.15;
        color: var(--primary);
        margin: 0 0 24px;
        letter-spacing: -0.02em;
      }

      .lead {
        font-size: 1.2rem;
        color: var(--text-soft);
        margin: 0 0 20px;
        line-height: 1.55;
      }

      .zusatz {
        font-size: 1rem;
        color: var(--text-soft);
        margin: 0 0 32px;
      }

      .btn-group {
        display: flex;
        gap: 16px;
        margin-bottom: 20px;
        flex-wrap: wrap;
      }

      .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 16px 28px;
        border-radius: var(--radius-md);
        font-weight: 700;
        font-size: 1rem;
        cursor: pointer;
        text-align: center;
        transition:
          transform 0.2s ease,
          box-shadow 0.2s ease;
        border: 2px solid transparent;
      }

      .btn-primary {
        background: linear-gradient(90deg, #d63b8d 0%, #eb6940 56%, #f39a2f 100%);
        color: #fff;
        border: none;
        border-radius: 999px;
        padding: 15px 34px;
        font-weight: 700;
        letter-spacing: 0.005em;
        box-shadow: 0 10px 22px rgba(213, 59, 140, 0.14), 0 6px 14px rgba(239, 107, 58, 0.14);
      }

      .btn-secondary {
        background: #fff;
        color: var(--primary);
        border-color: var(--line);
      }

      .btn:hover {
        transform: translateY(-2px);
      }

      .btn-primary:hover {
        box-shadow: 0 14px 28px rgba(213, 59, 140, 0.18), 0 8px 18px rgba(239, 107, 58, 0.18);
      }

      .doi-note {
        font-size: 0.85rem;
        color: var(--text-soft);
        margin-bottom: 32px;
        max-width: 90%;
        line-height: 1.4;
      }

      .trust-badges {
        display: grid;
        grid-template-columns: repeat(3, max-content);
        gap: 12px;
        align-items: center;
      }

      .badge {
        background: #fff;
        border: 1px solid var(--line);
        padding: 8px 16px;
        border-radius: 20px;
        font-size: 0.9rem;
        font-weight: 600;
        color: var(--primary-2);
        box-shadow: var(--shadow-sm);
        white-space: nowrap;
      }

      .hero-card {
        background: var(--surface);
        border-radius: var(--radius-xl);
        padding: 40px;
        box-shadow: var(--shadow);
        border: 1px solid var(--line);
      }

      .hero-card h3 {
        color: var(--primary);
        margin-top: 0;
        margin-bottom: 24px;
        font-size: 1.4rem;
      }

      .grid-features {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 16px;
      }

      .feature-item {
        background: var(--surface-alt);
        padding: 20px;
        border-radius: var(--radius-md);
        border: 1px solid var(--line);
      }

      .feature-item strong {
        display: block;
        color: var(--primary);
        margin-bottom: 6px;
        font-size: 0.95rem;
      }

      .feature-item span {
        display: block;
        font-size: 0.85rem;
        color: var(--text-soft);
        line-height: 1.4;
      }

      /* --- Sections General --- */
      .section-padding {
        padding: 80px 0;
      }

      .section-title {
        font-size: 2.4rem;
        color: var(--primary);
        margin: 0 0 20px;
        letter-spacing: -0.01em;
      }


      /* --- Nutzen --- */
      .nutzen-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
        margin-top: 48px;
      }

      .nutzen-card {
        background: #fff;
        padding: 32px 24px;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--line);
      }

      .nutzen-card h3 {
        font-size: 1.1rem;
        color: var(--primary);
        margin: 0 0 12px;
        line-height: 1.4;
      }

      .nutzen-card p {
        font-size: 0.95rem;
        color: var(--text-soft);
        margin: 0;
      }

      /* --- Für wen --- */
      .fuer-wen-box {
        background: linear-gradient(135deg, #ffffff, #eef4fa);
        padding: 56px 40px;
        border-radius: var(--radius-xl);
        border: 1px solid var(--line);
        text-align: center;
        box-shadow: var(--shadow);
      }

      .fuer-wen-box p {
        font-size: 1.15rem;
        color: var(--text-soft);
        max-width: 800px;
        margin: 0 auto;
      }

      /* --- Vergleich --- */
      .vergleich-intro {
        max-width: 760px;
        margin: 0 auto;
        text-align: center;
        font-size: 1.08rem;
        line-height: 1.72;
        color: var(--text-soft);
      }

      .vergleich-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 34px;
        margin-top: 52px;
        align-items: stretch;
      }

      .vergleich-card {
        position: relative;
        background: #ffffff;
        padding: 44px 42px 40px;
        border-radius: 26px;
        border: 1px solid rgba(14, 42, 71, 0.08);
        box-shadow: 0 8px 18px rgba(14, 42, 71, 0.04);
        overflow: hidden;
      }

      .vergleich-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, rgba(28, 79, 128, 0.72), rgba(28, 79, 128, 0.12));
      }

      .vergleich-card.highlight {
        background: #ffffff;
        border: 1.5px solid rgba(239, 140, 52, 0.5);
        box-shadow: 0 10px 22px rgba(14, 42, 71, 0.05);
      }

      .vergleich-card.highlight::before {
        display: none;
      }

      .vergleich-label {
        display: inline-block;
        margin-bottom: 18px;
        padding: 7px 15px;
        border-radius: 999px;
        background: #edf3f9;
        color: var(--primary-2);
        font-size: 0.78rem;
        font-weight: 700;
        letter-spacing: 0.055em;
        text-transform: uppercase;
      }

      .vergleich-card.highlight .vergleich-label {
        background: linear-gradient(90deg, #d63b8d 0%, #eb6940 58%, #f39a2f 100%);
        color: #fff;
        box-shadow: 0 6px 14px rgba(213, 59, 140, 0.12);
      }

      .vergleich-card h3 {
        font-size: 1.46rem;
        color: var(--primary);
        margin-top: 0;
        margin-bottom: 16px;
        line-height: 1.2;
        letter-spacing: -0.01em;
      }

      .vergleich-card p {
        color: var(--text-soft);
        font-size: 1rem;
        line-height: 1.68;
        margin: 0 0 22px;
      }

      .vergleich-card.highlight h3 {
        color: #1d4f80;
      }

      .vergleich-points {
        list-style: none;
        padding: 0;
        margin: 0;
        display: grid;
        gap: 13px;
      }

      .vergleich-points li {
        position: relative;
        padding-left: 20px;
        color: var(--text-soft);
        font-size: 0.98rem;
        line-height: 1.6;
      }

      .vergleich-points li::before {
        content: '';
        position: absolute;
        left: 0;
        top: 0.64em;
        width: 7px;
        height: 7px;
        border-radius: 50%;
        background: #ef8c34;
      }

      .vergleich-fazit {
        margin-top: 28px;
        padding: 18px 22px;
        border-radius: var(--radius-md);
        background: linear-gradient(135deg, #ffffff, #eef4fa);
        border: 1px solid rgba(14, 42, 71, 0.08);
        color: var(--primary);
        font-weight: 600;
        text-align: center;
        box-shadow: var(--shadow-sm);
      }

      /* --- Download / Form --- */
      .download-wrapper {
        background: var(--primary);
        border-radius: var(--radius-xl);
        padding: 80px 24px;
        margin: 40px auto;
        max-width: calc(var(--max-w) - 48px);
        box-shadow: var(--shadow);
      }

      .form-container {
        max-width: 640px;
        margin: 0 auto;
        background: #fff;
        padding: 48px;
        border-radius: var(--radius-xl);
        box-shadow: var(--shadow);
      }

      .form-container h2 {
        color: var(--primary);
        margin: 0 0 32px 0;
        font-size: 2rem;
        text-align: center;
      }

      .form-group {
        margin-bottom: 24px;
      }

      .form-group label {
        display: block;
        font-weight: 600;
        margin-bottom: 8px;
        font-size: 0.95rem;
        color: var(--primary);
      }

      .form-group input[type='text'],
      .form-group input[type='email'] {
        width: 100%;
        padding: 14px 16px;
        border: 1px solid var(--line);
        border-radius: var(--radius-md);
        font-family: inherit;
        font-size: 1rem;
        color: var(--text);
        background: var(--bg);
        outline: none;
        transition: border-color 0.2s;
      }

      .form-group input:focus {
        border-color: var(--primary-2);
        background: #fff;
      }

      .form-group.checkbox-group {
        display: flex;
        align-items: flex-start;
        gap: 12px;
        margin-bottom: 16px;
      }

      .form-group.checkbox-group input {
        margin-top: 4px;
        width: 18px;
        height: 18px;
        accent-color: var(--primary);
        cursor: pointer;
      }

      .form-group.checkbox-group label {
        font-weight: 400;
        font-size: 0.9rem;
        color: var(--text-soft);
        line-height: 1.4;
        cursor: pointer;
      }

      .legal-note {
        font-size: 0.85rem;
        color: var(--text-soft);
        line-height: 1.5;
        margin-bottom: 24px;
        padding: 16px;
        background: var(--surface-alt);
        border-radius: var(--radius-md);
      }

      .legal-note a {
        color: var(--primary-2);
        text-decoration: underline;
      }

      .submit-btn {
        width: 100%;
        border: none;
        font-size: 1.1rem;
        padding: 18px;
      }

      /* --- Download Tab Switcher --- */
      .download-header {
        text-align: center;
        margin-bottom: 40px;
      }
      .download-header h2 {
        color: #fff;
        font-size: 2rem;
        margin: 0 0 12px;
        letter-spacing: -0.01em;
      }
      .download-header p {
        color: rgba(255,255,255,0.72);
        font-size: 1.05rem;
        margin: 0;
      }
      .tab-switcher {
        display: flex;
        gap: 0;
        background: rgba(255,255,255,0.1);
        border-radius: 999px;
        padding: 5px;
        max-width: 440px;
        margin: 0 auto 40px;
        border: 1px solid rgba(255,255,255,0.15);
      }
      .tab-btn {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 13px 20px;
        border-radius: 999px;
        font-weight: 700;
        font-size: 0.95rem;
        cursor: pointer;
        border: none;
        background: transparent;
        color: rgba(255,255,255,0.65);
        transition: all 0.25s ease;
        font-family: inherit;
      }
      .tab-btn:hover { color: rgba(255,255,255,0.9); }
      .tab-btn.tab-active {
        background: #fff;
        color: var(--primary);
        box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      }
      .tab-panel { display: block; }
      .tab-panel-hidden { display: none; }
      .form-container-wide { max-width: 820px; }
      .mitglied-icon { font-size: 2.4rem; margin-bottom: 16px; text-align: center; }
      .form-container h3 {
        color: var(--primary);
        font-size: 1.6rem;
        margin: 0 0 12px;
        text-align: center;
      }
      .tab-desc {
        text-align: center;
        color: var(--text-soft);
        font-size: 1rem;
        line-height: 1.6;
        margin: 0 auto 28px;
        max-width: 500px;
      }
      .btn-portal {
        display: block;
        width: fit-content;
        margin: 0 auto;
        padding: 17px 40px;
        font-size: 1.1rem;
      }
      .tab-hint {
        text-align: center;
        font-size: 0.82rem;
        color: var(--text-soft);
        margin: 10px 0 0;
      }
      .tab-divider { height: 1px; background: var(--line); margin: 28px 0; }
      .tab-not-member {
        text-align: center;
        font-size: 0.9rem;
        color: var(--text-soft);
        margin: 0;
      }
      .link-btn {
        background: none;
        border: none;
        color: var(--primary-2);
        font-weight: 600;
        cursor: pointer;
        font-family: inherit;
        font-size: inherit;
        text-decoration: underline;
        padding: 0;
      }
      .link-btn:hover { color: var(--primary); }
      .iframe-wrapper {
        border: 1px solid var(--line);
        border-radius: var(--radius-lg);
        overflow: hidden;
        background: var(--bg);
      }

      /* --- FAQ --- */
      .faq-wrapper {
        max-width: 860px;
        margin: 48px auto 0;
        display: grid;
        gap: 18px;
      }

      details {
        background: linear-gradient(135deg, #ffffff, #fbfdff);
        border: 1px solid var(--line);
        border-radius: var(--radius-lg);
        padding: 0;
        box-shadow: var(--shadow-sm);
        overflow: hidden;
        transition:
          box-shadow 0.22s ease,
          border-color 0.22s ease,
          transform 0.22s ease,
          background 0.22s ease;
      }

      details:hover {
        border-color: rgba(28, 79, 128, 0.18);
        box-shadow: 0 10px 24px rgba(14, 42, 71, 0.07);
        transform: translateY(-1px);
      }

      details[open] {
        border-color: rgba(216, 155, 61, 0.38);
        box-shadow: var(--shadow);
        background: linear-gradient(135deg, #ffffff, #f7fbff);
      }

      summary {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 18px;
        font-weight: 700;
        color: var(--primary);
        cursor: pointer;
        outline: none;
        font-size: 1.08rem;
        line-height: 1.45;
        list-style: none;
        position: relative;
        padding: 24px 26px;
      }

      summary::-webkit-details-marker {
        display: none;
      }

      summary::after {
        content: '+';
        flex: 0 0 34px;
        width: 34px;
        height: 34px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border-radius: 999px;
        background: var(--surface-alt);
        color: var(--accent-dark);
        font-size: 1.3rem;
        line-height: 1;
        font-weight: 600;
        transition:
          background 0.22s ease,
          color 0.22s ease,
          transform 0.22s ease;
      }

      details:hover summary::after {
        background: rgba(216, 155, 61, 0.14);
      }

      details[open] summary::after {
        content: '−';
        background: rgba(216, 155, 61, 0.16);
        color: var(--accent-dark);
        transform: rotate(0deg);
      }

      details p {
        margin: 0;
        padding: 0 26px 24px;
        color: var(--text-soft);
        font-size: 1rem;
        line-height: 1.65;
      }

      /* --- CTA Band --- */
      .cta-band {
        background: linear-gradient(135deg, var(--bg), var(--surface-alt));
        text-align: center;
        padding: 64px 24px;
        border-radius: var(--radius-xl);
        border: 1px solid var(--line);
        margin-top: 80px;
        box-shadow: var(--shadow-sm);
      }

      /* --- Footer --- */
      footer {
        padding: 48px 0;
        text-align: center;
        color: var(--text-soft);
        font-size: 0.9rem;
        border-top: 1px solid var(--line);
        margin-top: 64px;
      }

      footer a {
        color: var(--primary-2);
        margin: 0 12px;
      }

      footer a:hover {
        text-decoration: underline;
      }

      /* --- Responsive --- */
      @media (max-width: 1024px) {
        .hero-grid,
        .vergleich-grid {
          grid-template-columns: 1fr;
          gap: 40px;
        }
        .nutzen-grid {
          grid-template-columns: 1fr 1fr;
        }
        h1 {
          font-size: 2.6rem;
        }
        .nav-links {
          display: none;
        }
      }
      @media (max-width: 600px) {
        .nutzen-grid {
          grid-template-columns: 1fr;
        }
        .grid-features {
          grid-template-columns: 1fr;
        }
        h1 {
          font-size: 2.2rem;
        }
        .btn-group {
          flex-direction: column;
          width: 100%;
        }
        .btn {
          width: 100%;
        }
        a.btn-primary {
          min-height: 56px;
          padding: 14px 20px;
          font-size: 0.98rem;
          line-height: 1.25;
          letter-spacing: 0;
          box-shadow: 0 10px 20px rgba(213, 59, 140, 0.14), 0 6px 14px rgba(239, 107, 58, 0.14);
        }
        .vergleich-intro {
          text-align: left;
          font-size: 1rem;
          line-height: 1.65;
        }
        .vergleich-grid {
          gap: 20px;
          margin-top: 32px;
        }
        .vergleich-card {
          padding: 30px 22px 28px;
          border-radius: 22px;
        }
        .vergleich-label {
          margin-bottom: 14px;
          padding: 6px 12px;
          font-size: 0.72rem;
          letter-spacing: 0.05em;
        }
        .vergleich-card h3 {
          font-size: 1.24rem;
          margin-bottom: 12px;
        }
        .vergleich-card p {
          font-size: 0.96rem;
          line-height: 1.62;
          margin-bottom: 18px;
        }
        .vergleich-points {
          gap: 10px;
        }
        .vergleich-points li {
          font-size: 0.95rem;
          padding-left: 18px;
        }
        .vergleich-points li::before {
          width: 6px;
          height: 6px;
          top: 0.66em;
        }
        .trust-badges {
          grid-template-columns: 1fr;
        }
        .badge {
          white-space: normal;
        }
        .form-container {
          padding: 32px 24px;
        }
        .fuer-wen-box {
          padding: 40px 24px;
        }
        summary {
          padding: 20px 20px;
          font-size: 1rem;
        }
        details p {
          padding: 0 20px 20px;
        }
      }