/* Base Reset & Scoped CSS Variables */
  .std-hats-collection * {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
  }

  .std-hats-collection {
    --primary-indigo: #4f46e5;
    --primary-dark: #3730a3;
    --secondary-violet: #7c3aed;
    --accent-cyan: #0284c7;
    --accent-emerald: #059669;
    --accent-amber: #d97706;
    --accent-rose: #e11d48;
    --text-main: #0f172a;
    --text-muted: #475569;
    --text-light: #64748b;
    --bg-surface: #ffffff;
    --bg-page: #f1f4ff;
    --bg-subtle: #f8fafc;
    --border-soft: #e2e8f0;
    --border-focus: #c7d2fe;
    --shadow-sm: 0 2px 8px rgba(99, 102, 241, 0.04);
    --shadow-md: 0 8px 24px rgba(99, 102, 241, 0.08);
    --shadow-lg: 0 16px 36px rgba(99, 102, 241, 0.12);

    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 16px 60px 16px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--bg-page);
  }

  /* 1. Hero Header Banner (Modern Creator Studio Theme) */
  .std-hats-hero {
    background: linear-gradient(135deg, #eef2ff 0%, #fdf4ff 45%, #fff7ed 100%);
    border: 1px solid #e0e7ff;
    border-radius: 24px;
    padding: 48px 40px;
    text-align: center;
    margin-bottom: 36px;
    box-shadow: var(--shadow-md);
  }

  .std-hats-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: #ffffff;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 6px 18px;
    border-radius: 9999px;
    margin-bottom: 18px;
    box-shadow: 0 3px 10px rgba(79, 70, 229, 0.3);
  }

  .std-hats-title {
    font-size: 34px;
    font-weight: 900;
    color: var(--text-main);
    line-height: 1.25;
    margin: 0 0 14px 0;
    letter-spacing: -0.6px;
  }

  .std-hats-subtitle {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-indigo);
    margin: 0 0 20px 0;
  }

  .std-hats-desc {
    font-size: 15px;
    color: var(--text-muted);
    max-width: 960px;
    margin: 0 auto 28px auto;
    line-height: 1.7;
  }

  .std-hats-badges-row {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
  }

  .std-hats-badge-item {
    background: #ffffff;
    border: 1px solid var(--border-soft);
    padding: 8px 18px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 700;
    color: #1e293b;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 8px;
  }

  /* 2. AI Direct Answer / GEO Authority Summary */
  .std-hats-ai-box {
    background: #ffffff;
    border: 1px solid #e0e7ff;
    border-left: 5px solid var(--primary-indigo);
    border-radius: 18px;
    padding: 28px 32px;
    margin-bottom: 40px;
    box-shadow: var(--shadow-sm);
  }

  .std-hats-ai-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
  }

  .std-hats-ai-title {
    font-size: 18px;
    font-weight: 800;
    color: var(--primary-indigo);
    margin: 0;
  }

  .std-hats-ai-content {
    font-size: 14.5px;
    color: var(--text-muted);
    line-height: 1.75;
    margin: 0 0 16px 0;
  }

  .std-hats-spec-pills {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
  }

  .std-hats-spec-pill {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 12px 14px;
    text-align: center;
  }

  .std-hats-spec-k {
    font-size: 11px;
    font-weight: 800;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
  }

  .std-hats-spec-v {
    font-size: 13.5px;
    font-weight: 800;
    color: var(--text-main);
  }

  /* 3. Section Headers */
  .std-section-header {
    text-align: center;
    margin: 48px 0 28px 0;
  }

  .std-section-pill {
    display: inline-block;
    background: #eef2ff;
    color: var(--primary-indigo);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 5px 14px;
    border-radius: 9999px;
    margin-bottom: 10px;
    border: 1px solid #c7d2fe;
  }

  .std-section-title {
    font-size: 26px;
    font-weight: 900;
    color: var(--text-main);
    margin: 0 0 8px 0;
    letter-spacing: -0.3px;
  }

  .std-section-subtitle {
    font-size: 14.5px;
    color: var(--text-muted);
    margin: 0;
  }

  /* 4. 4-Step OEM/ODM Manufacturing Workflow */
  .std-workflow-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 40px;
  }

  .std-workflow-card {
    background: #ffffff;
    border: 1px solid var(--border-soft);
    border-radius: 18px;
    padding: 24px 20px;
    position: relative;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
  }

  .std-workflow-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-focus);
  }

  .std-step-number {
    font-size: 30px;
    font-weight: 900;
    color: #e0e7ff;
    line-height: 1;
    margin-bottom: 12px;
  }

  .std-step-title {
    font-size: 16px;
    font-weight: 800;
    color: var(--text-main);
    margin: 0 0 8px 0;
  }

  .std-step-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
    margin: 0;
  }

  .std-step-highlight {
    display: inline-block;
    margin-top: 10px;
    font-size: 11.5px;
    font-weight: 700;
    color: var(--primary-indigo);
    background: #eef2ff;
    padding: 2px 8px;
    border-radius: 6px;
  }

  /* 5. Signature Product Series Grid (2-Column Cards) */
  .std-series-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 48px;
  }

  .std-series-card {
    background: #ffffff;
    border: 1px solid var(--border-soft);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
  }

  .std-series-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: #cbd5e1;
  }

  .std-series-img-wrap {
    background: #fbfbfe;
    position: relative;
    border-bottom: 1px solid #f1f5f9;
    overflow: hidden;
  }

  .std-series-img-wrap img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
    transition: transform 0.3s ease;
  }

  .std-series-card:hover .std-series-img-wrap img {
    transform: scale(1.015);
  }

  .std-series-badge {
    position: absolute;
    top: 14px;
    left: 14px;
    background: rgba(15, 23, 42, 0.85);
    color: #ffffff;
    font-size: 11px;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: 6px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    backdrop-filter: blur(4px);
  }

  .std-series-body {
    padding: 22px 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    flex-grow: 1;
  }

  .std-series-title {
    font-size: 17.5px;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.35;
    margin: 0 0 8px 0;
  }

  .std-series-desc {
    font-size: 13.5px;
    color: var(--text-muted);
    line-height: 1.6;
    margin: 0 0 14px 0;
  }

  .std-tag-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 14px;
  }

  .std-tag-pill {
    font-size: 11px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 6px;
  }

  .std-tag-indigo { background: #eef2ff; color: #4338ca; border: 1px solid #c7d2fe; }
  .std-tag-amber  { background: #fef3c7; color: #b45309; border: 1px solid #fde68a; }
  .std-tag-cyan   { background: #ecfeff; color: #0891b2; border: 1px solid #a5f3fc; }
  .std-tag-emerald{ background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
  .std-tag-purple { background: #f3e8ff; color: #7e22ce; border: 1px solid #e9d5ff; }
  .std-tag-rose   { background: #ffe4e6; color: #be123c; border: 1px solid #fecdd3; }
  .std-tag-dark   { background: #f1f5f9; color: #334155; border: 1px solid #cbd5e1; }

  .std-craft-highlight {
    background: #f8fafc;
    border-left: 3px solid var(--primary-indigo);
    padding: 10px 14px;
    border-radius: 4px 8px 8px 4px;
    font-size: 12px;
    color: #334155;
    line-height: 1.5;
  }

  /* 6. Master Craft & Technical Specifications Matrix */
  .std-specs-box {
    background: #ffffff;
    border: 1px solid var(--border-soft);
    border-radius: 20px;
    padding: 32px 28px;
    margin-bottom: 48px;
    box-shadow: var(--shadow-sm);
  }

  .std-specs-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
    margin-top: 10px;
  }

  .std-specs-table th {
    background: #f8fafc;
    color: var(--text-main);
    font-weight: 800;
    text-align: left;
    padding: 14px 18px;
    border-bottom: 2px solid #cbd5e1;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }

  .std-specs-table td {
    padding: 13px 18px;
    border-bottom: 1px solid var(--border-soft);
    color: var(--text-muted);
    vertical-align: top;
    line-height: 1.6;
  }

  .std-specs-table tr:last-child td {
    border-bottom: none;
  }

  .std-specs-table tr:hover td {
    background-color: #fbfbfe;
  }

  .std-spec-label {
    font-weight: 800;
    color: var(--text-main);
    white-space: nowrap;
  }

  /* 7. 7-Item Native Interactive FAQ Accordion */
  .std-faq-box {
    margin-bottom: 48px;
  }

  .std-faq-item {
    background: #ffffff;
    border: 1px solid var(--border-soft);
    border-radius: 14px;
    margin-bottom: 12px;
    overflow: hidden;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
  }

  .std-faq-item:hover {
    border-color: #cbd5e1;
  }

  .std-faq-item[open] {
    border-color: var(--primary-indigo);
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.08);
  }

  .std-faq-summary {
    padding: 18px 22px;
    font-size: 15.5px;
    font-weight: 800;
    color: var(--text-main);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: background 0.2s ease, color 0.2s ease;
  }

  .std-faq-summary::-webkit-details-marker {
    display: none;
  }

  .std-faq-summary::after {
    content: "+";
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-indigo);
    transition: transform 0.2s ease;
    margin-left: 10px;
    flex-shrink: 0;
  }

  .std-faq-item[open] .std-faq-summary::after {
    content: "−";
    transform: rotate(180deg);
  }

  .std-faq-item[open] .std-faq-summary {
    background: #eef2ff;
    color: var(--primary-dark);
  }

  .std-faq-body {
    padding: 16px 22px 22px 22px;
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
    border-top: 1px solid #c7d2fe;
    background: #ffffff;
  }

  /* 8. Trust Badges Grid (4-Column) */
  .std-trust-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .std-trust-card {
    background: #ffffff;
    border: 1px solid var(--border-soft);
    border-radius: 16px;
    padding: 22px 18px;
    text-align: center;
    box-shadow: var(--shadow-sm);
  }

  .std-trust-icon {
    font-size: 28px;
    margin-bottom: 10px;
    display: block;
  }

  .std-trust-title {
    font-size: 15px;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 6px;
  }

  .std-trust-desc {
    font-size: 12.5px;
    color: var(--text-light);
    line-height: 1.45;
  }