/* Reset & Base Typography */
    .btm-guide-container * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    .btm-guide-container {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      color: #1e293b;
      line-height: 1.7;
      max-width: 1080px;
      margin: 0 auto;
      padding: 32px 20px 60px;
      background-color: #ffffff;
    }
    
    /* Header / Hero */
    .btm-hero {
      background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
      color: #ffffff;
      padding: 48px 36px;
      border-radius: 16px;
      margin-bottom: 40px;
      box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.15);
    }
    .btm-hero .btm-badge {
      display: inline-block;
      background: rgba(59, 130, 246, 0.3);
      border: 1px solid rgba(147, 197, 253, 0.4);
      color: #bfdbfe;
      font-size: 13px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      padding: 4px 12px;
      border-radius: 9999px;
      margin-bottom: 16px;
    }
    .btm-hero h1 {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 16px;
      color: #ffffff;
    }
    .btm-hero p.btm-lead {
      font-size: 17px;
      color: #e2e8f0;
      max-width: 860px;
      line-height: 1.6;
    }
    .btm-meta-bar {
      margin-top: 24px;
      padding-top: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.15);
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      font-size: 14px;
      color: #94a3b8;
    }
    .btm-meta-bar strong {
      color: #f1f5f9;
    }

    /* Headings */
    .btm-section {
      margin-bottom: 48px;
    }
    .btm-section h2 {
      font-size: 24px;
      font-weight: 700;
      color: #0f172a;
      border-bottom: 2px solid #e2e8f0;
      padding-bottom: 12px;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btm-section h3 {
      font-size: 18px;
      font-weight: 600;
      color: #1e3a8a;
      margin: 24px 0 12px;
    }
    .btm-section p {
      margin-bottom: 16px;
      font-size: 15px;
      color: #334155;
    }

    /* Feature Grid */
    .btm-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 20px;
      margin: 24px 0;
    }
    .btm-card {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 24px 20px;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .btm-card:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.06);
      border-color: #cbd5e1;
    }
    .btm-card-icon {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: #eff6ff;
      color: #2563eb;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 16px;
    }
    .btm-card h4 {
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }
    .btm-card p {
      font-size: 14px;
      color: #64748b;
      margin-bottom: 0;
      line-height: 1.5;
    }

    /* Tables */
    .btm-table-wrapper {
      overflow-x: auto;
      margin: 24px 0;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    }
    .btm-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .btm-table th {
      background: #f1f5f9;
      color: #0f172a;
      font-weight: 700;
      padding: 14px 16px;
      border-bottom: 1px solid #cbd5e1;
    }
    .btm-table td {
      padding: 14px 16px;
      border-bottom: 1px solid #e2e8f0;
      color: #334155;
    }
    .btm-table tr:last-child td {
      border-bottom: none;
    }
    .btm-table tr:nth-child(even) {
      background-color: #f8fafc;
    }
    .btm-highlight-col {
      background-color: #eff6ff !important;
      font-weight: 600;
      color: #1e40af !important;
    }

    /* Code & JSON Block */
    .btm-code-block {
      background: #0f172a;
      color: #e2e8f0;
      padding: 20px;
      border-radius: 12px;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-size: 13px;
      line-height: 1.6;
      overflow-x: auto;
      margin: 20px 0;
      border: 1px solid #1e293b;
    }

    /* Checklist & Callouts */
    .btm-checklist {
      list-style: none;
      margin: 20px 0;
    }
    .btm-checklist li {
      position: relative;
      padding-left: 28px;
      margin-bottom: 12px;
      font-size: 15px;
      color: #334155;
    }
    .btm-checklist li::before {
      content: "✓";
      position: absolute;
      left: 0;
      top: 0;
      color: #16a34a;
      font-weight: 800;
      font-size: 16px;
    }
    .btm-callout {
      background: #f0fdf4;
      border-left: 4px solid #22c55e;
      padding: 18px 20px;
      border-radius: 0 8px 8px 0;
      margin: 24px 0;
      font-size: 14px;
      color: #166534;
    }

    /* FAQ Section */
    .btm-faq-item {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 20px;
      margin-bottom: 16px;
    }
    .btm-faq-item h4 {
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .btm-faq-item p {
      font-size: 14px;
      color: #475569;
      margin-bottom: 0;
    }

    /* CTA Box */
    .btm-cta-box {
      background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
      color: #ffffff;
      padding: 36px;
      border-radius: 16px;
      text-align: center;
      margin-top: 48px;
    }
    .btm-cta-box h3 {
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 12px;
      color: #ffffff;
    }
    .btm-cta-box p {
      font-size: 15px;
      color: #dbeafe;
      max-width: 650px;
      margin: 0 auto 24px;
    }
    .btm-btn {
      display: inline-block;
      background: #ffffff;
      color: #1e3a8a;
      font-weight: 700;
      font-size: 15px;
      padding: 12px 28px;
      border-radius: 8px;
      text-decoration: none;
      transition: background 0.2s ease, transform 0.1s ease;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }
    .btm-btn:hover {
      background: #f8fafc;
      transform: translateY(-1px);
    }

    /* Responsive */
    @media (max-width: 768px) {
      .btm-hero { padding: 32px 20px; }
      .btm-hero h1 { font-size: 24px; }
      .btm-guide-container { padding: 20px 14px 40px; }
    }