/* ═══════════════════════════════════════════
       0. Custom Properties
       ═══════════════════════════════════════════ */
    :root {
      --accent:       #f59e0b;
      --accent-light: #fef3c7;
      --accent-dark:  #b45309;
      --accent-text:  #78350f;
      --text:         #1e293b;
      --text-mid:     #475569;
      --text-light:   #64748b;
      --bg:           #ffffff;
      --bg-page:      #f8fafc;
      --bg-alt:       #f1f5f9;
      --border:       #e2e8f0;
      --border-light: #f1f5f9;
      --radius:       12px;
      --radius-sm:    8px;
      --shadow-sm:    0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md:    0 4px 16px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
      --shadow-lg:    0 8px 30px rgba(0,0,0,0.08);
      --focus-ring:   0 0 0 3px rgba(245,158,11,0.45);
      --transition:   0.2s ease;
      --toc-width:    260px;
      --content-max:  760px;
    }

    /* ═══ 1. Reset & Base ═══ */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; scroll-padding-top: 24px; }
    body {
      background: var(--bg-page); color: var(--text);
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
      font-size: clamp(15px, 1vw + 12px, 17px); line-height: 1.75;
      -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility;
    }

    /* ═══ 2. Skip Link ═══ */
    .skip-link {
      position: absolute; top: -100%; left: 16px; z-index: 9999; padding: 12px 24px;
      background: var(--text); color: #fff; border-radius: var(--radius-sm);
      font-weight: 600; font-size: 0.9rem; text-decoration: none; transition: top var(--transition);
    }
    .skip-link:focus { top: 16px; }

    /* ═══ 3. Progress Bar ═══ */
    .progress-bar {
      position: fixed; top: 0; left: 0; width: 0%; height: 3px;
      background: linear-gradient(90deg, var(--accent), var(--accent-dark));
      z-index: 1000; transition: width 60ms linear; border-radius: 0 2px 2px 0;
    }

    /* ═══ 4. Layout ═══ */
    .vl-layout {
      display: grid; grid-template-columns: var(--toc-width) 1fr; gap: 0;
      max-width: calc(var(--toc-width) + var(--content-max) + 80px); margin: 0 auto;
    }

    /* ═══ 5. ToC Sidebar ═══ */
    .toc {
      position: sticky; top: 12px; align-self: start; height: calc(100dvh - 24px);
      padding: 24px 16px 24px 20px; border-right: 1px solid var(--border);
      background: var(--bg); scrollbar-width: thin; scrollbar-color: var(--border) transparent;
    }
    .toc::-webkit-scrollbar { width: 4px; }
    .toc::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
    .toc-title { font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-light); margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
    .toc-group { margin-bottom: 12px; }
    .toc-group-label { font-size: 0.65rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent-dark); padding: 4px 0 4px 10px; margin-bottom: 2px; }
    .toc-link { display: block; padding: 4px 10px; font-size: 0.82rem; line-height: 1.5; color: var(--text-mid); text-decoration: none; border-radius: var(--radius-sm); border-left: 2px solid transparent; transition: all var(--transition); }
    .toc-link:hover { color: var(--text); background: var(--bg-alt); }
    .toc-link.active { color: var(--accent-dark); background: var(--accent-light); border-left-color: var(--accent); font-weight: 600; }
    .toc-link:focus-visible { outline: none; box-shadow: var(--focus-ring); }

    .toc-toggle { display: none; position: fixed; bottom: 80px; right: 20px; z-index: 200; width: 48px; height: 48px; border-radius: 50%; border: none; background: var(--text); color: #fff; cursor: pointer; box-shadow: var(--shadow-md); transition: transform var(--transition), background var(--transition); align-items: center; justify-content: center; }
    .toc-toggle:hover { background: var(--text-mid); }
    .toc-toggle:focus-visible { outline: none; box-shadow: var(--focus-ring); }
    .toc-toggle svg { width: 20px; height: 20px; fill: currentColor; }
    .toc-close { display: none; position: absolute; top: 12px; right: 12px; width: 32px; height: 32px; border-radius: 50%; border: 1px solid var(--border); background: var(--bg); color: var(--text); font-size: 1.2rem; cursor: pointer; align-items: center; justify-content: center; line-height: 1; }
    .toc-close:focus-visible { outline: none; box-shadow: var(--focus-ring); }
    .toc-backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.3); z-index: 299; }
    .toc-backdrop.visible { display: block; }

    /* ═══ 6. Main ═══ */
    .vl-main { max-width: var(--content-max); padding: 40px clamp(16px, 4vw, 48px) 64px; }

    /* ═══ 7. Hero ═══ */
    .vl-hero { text-align: center; margin-bottom: 40px; padding-bottom: 32px; border-bottom: 2px solid var(--accent); }
    .vl-hero h1 { font-size: clamp(1.5rem, 2.5vw + 0.5rem, 2rem); font-weight: 800; color: var(--text); letter-spacing: -0.025em; line-height: 1.25; margin-bottom: 8px; }
    .vl-hero .company { font-size: 1rem; font-weight: 600; color: var(--accent-dark); margin-bottom: 4px; }
    .vl-hero .subtitle { font-size: 0.85rem; color: var(--text-light); }

    /* ═══ 8. Group Dividers ═══ */
    .group-divider { display: flex; align-items: center; gap: 12px; margin: 36px 0 20px; padding: 0 4px; }
    .group-divider::before, .group-divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }
    .group-divider-label { font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-light); white-space: nowrap; }

    /* ═══ 9. Cards ═══ */
    .vl-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 20px; overflow: hidden; transition: box-shadow var(--transition); scroll-margin-top: 20px; }
    .vl-card:hover { box-shadow: var(--shadow-sm); }
    .vl-card:target { box-shadow: 0 0 0 2px var(--accent); }
    .vl-card--highlight { border-left: 3px solid var(--accent); }
    .vl-card--highlight .vl-card-header { background: linear-gradient(135deg, var(--accent-light) 0%, var(--bg) 70%); }
    .vl-card-header { display: flex; align-items: center; gap: 12px; padding: 18px 24px 14px; border-bottom: 1px solid var(--border-light); background: var(--bg); }
    .badge { display: inline-flex; align-items: center; justify-content: center; min-width: 38px; height: 32px; padding: 0 10px; border-radius: var(--radius-sm); background: var(--accent-light); color: var(--accent-text); font-size: 0.78rem; font-weight: 800; flex-shrink: 0; border: 1px solid rgba(245,158,11,0.25); }
    .badge--icon { font-size: 1.1rem; padding: 0 8px; }
    .vl-card-header h2 { font-size: clamp(1rem, 1.5vw + 0.4rem, 1.15rem); font-weight: 700; color: var(--text); margin: 0; line-height: 1.35; }
    .anchor-link { display: inline-block; margin-left: 6px; font-size: 0.8em; color: var(--text-light); text-decoration: none; opacity: 0; transition: opacity var(--transition); vertical-align: middle; }
    .vl-card:hover .anchor-link, .anchor-link:focus { opacity: 1; }
    .vl-card-body { padding: 20px 24px 24px; }
    .vl-card-body p { margin-bottom: 16px; color: var(--text-mid); }

    /* ═══ 10. Info Row ═══ */
    .info-row { display: flex; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--border-light); }
    .info-row:last-of-type { border-bottom: none; }
    .info-label { flex: 0 0 140px; font-weight: 700; font-size: 0.88rem; color: var(--text); }
    .info-value { flex: 1; font-size: 0.9rem; color: var(--text-mid); line-height: 1.6; }
    .info-value a { color: var(--accent-dark); text-decoration: none; }
    .info-value a:hover { text-decoration: underline; }

    /* ═══ 11. Step List ═══ */
    .step-list { list-style: none; counter-reset: step; margin: 16px 0; }
    .step-list li { counter-increment: step; display: flex; align-items: flex-start; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--border-light); }
    .step-list li:last-child { border-bottom: none; }
    .step-list li::before { content: counter(step); display: flex; align-items: center; justify-content: center; min-width: 32px; height: 32px; border-radius: 50%; background: var(--accent-light); color: var(--accent-text); font-weight: 800; font-size: 0.85rem; flex-shrink: 0; border: 1px solid rgba(245,158,11,0.25); }

    /* ═══ 12. Versand List ═══ */
    .vl-list { list-style: none; margin: 12px 0; padding: 0; }
    .vl-list li { position: relative; padding: 6px 0 6px 20px; color: var(--text-mid); font-size: 0.9rem; }
    .vl-list li::before { content: '•'; position: absolute; left: 4px; color: var(--accent); font-weight: 700; }

    /* ═══ 13. Feature Grid ═══ */
    .feature-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin: 16px 0; }
    .feature-item { display: flex; align-items: flex-start; gap: 10px; padding: 14px 16px; background: var(--bg-alt); border-radius: var(--radius-sm); border: 1px solid var(--border-light); }
    .feature-icon { font-size: 1.3rem; flex-shrink: 0; margin-top: 2px; }
    .feature-text { font-size: 0.88rem; color: var(--text); }
    .feature-text strong { display: block; margin-bottom: 2px; }
    .feature-text span { color: var(--text-mid); font-size: 0.82rem; }

    /* ═══ 14. Hint Box ═══ */
    .hint-box { display: flex; align-items: flex-start; gap: 12px; padding: 16px 20px; background: var(--accent-light); border: 1px solid rgba(245,158,11,0.25); border-radius: var(--radius-sm); margin-top: 20px; font-size: 0.88rem; color: var(--accent-text); line-height: 1.6; }
    .hint-icon { font-size: 1.2rem; flex-shrink: 0; margin-top: 1px; }

    /* ═══ 15. Table ═══ */
    .vl-table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 0.88rem; }
    .vl-table th, .vl-table td { padding: 10px 14px; border: 1px solid var(--border); text-align: left; }
    .vl-table th { background: var(--bg-alt); font-weight: 700; color: var(--text); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; }
    .vl-table td { color: var(--text-mid); }
    .vl-table tr:hover td { background: var(--border-light); }

    /* ═══ 16. Footer ═══ */
    .vl-footer { text-align: center; padding: 32px 24px; margin-top: 40px; border-top: 1px solid var(--border); font-size: 0.82rem; color: var(--text-light); line-height: 1.7; }
    .vl-footer .company-name { font-weight: 700; color: var(--text); margin-bottom: 4px; }
    .vl-footer a { color: var(--accent-dark); text-decoration: none; }
    .vl-footer a:hover { text-decoration: underline; }

    /* ═══ 17. Back-to-Top ═══ */
    .back-to-top { position: fixed; bottom: 24px; right: 20px; z-index: 100; width: 44px; height: 44px; border-radius: 50%; border: none; background: var(--text); color: #fff; cursor: pointer; box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transform: translateY(12px); transition: opacity var(--transition), visibility var(--transition), transform var(--transition), background var(--transition); display: flex; align-items: center; justify-content: center; }
    .back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
    .back-to-top:hover { background: var(--text-mid); }
    .back-to-top:focus-visible { outline: none; box-shadow: var(--focus-ring); }
    .back-to-top svg { width: 18px; height: 18px; fill: currentColor; }

    /* ═══ 18. Focus ═══ */
    a:focus-visible, button:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-sm); }

    /* ═══ 19. Print ═══ */
    @media print {
      .toc, .toc-toggle, .toc-backdrop, .back-to-top, .progress-bar, .skip-link { display: none !important; }
      .vl-layout { display: block; }
      .vl-card { break-inside: avoid; box-shadow: none; border: 1px solid #ccc; }
      body { font-size: 11pt; }
    }

    /* ═══ 20. Reduced Motion ═══ */
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
    }

    /* ═══ 21. ≤ 1080px ═══ */
    @media (max-width: 1080px) {
      .vl-layout { grid-template-columns: 1fr; }
      .toc { position: fixed; top: 0; left: 0; width: 280px; height: 100dvh; z-index: 300; transform: translateX(-100%); transition: transform 0.3s ease; border-right: 1px solid var(--border); box-shadow: var(--shadow-lg); padding-top: 52px; }
      .toc.open { transform: translateX(0); }
      .toc-close { display: flex; }
      .toc-toggle { display: flex; }
    }

    /* ═══ 22. ≤ 640px ═══ */
    @media (max-width: 640px) {
      .vl-main { padding: 24px 16px 48px; }
      .vl-card-header { padding: 14px 16px 12px; }
      .vl-card-body { padding: 16px; }
      .vl-hero h1 { font-size: 1.35rem; }
      .info-row { flex-direction: column; gap: 4px; }
      .info-label { flex: none; }
      .feature-grid { grid-template-columns: 1fr; }
    }

    /* ═══ 23. ≤ 380px ═══ */
    @media (max-width: 380px) {
      .vl-hero h1 { font-size: 1.2rem; }
      .hint-box { flex-direction: column; gap: 8px; }
    }