/* ============ RESET & BASE ============ */
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

  :root {
    --c-brand: #123a63;
    --c-brand-light: #f5f8fc;
    --c-brand-border: #dfe4ec;
    --c-text: #22303f;
    --c-text-muted: #5c6b7c;
    --c-accent: #0B5FFF;
    --c-bg: #ffffff;
    --c-bg-soft: #f7f8fa;
    --font-sans: 'Segoe UI', Arial, sans-serif;
    --radius: 8px;
    --max-width: 1320px;
  }

  html { scroll-behavior: smooth; }

  body {
    font-family: var(--font-sans);
    color: var(--c-text);
    background: var(--c-bg);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
  }

  /* ============ TOP NAV ============ */
  .topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--c-brand);
    box-shadow: 0 2px 12px rgba(0,0,0,0.15);
  }
  .topbar-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    padding: 0 32px;
  }
  .logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 18px;
    color: #fff;
    letter-spacing: .5px;
  }
  .logo .logo-dot {
    width: 28px; height: 28px;
    border-radius: 6px;
    background: #fff;
    display: flex; align-items: center; justify-content: center;
    color: var(--c-brand); font-size: 11px; font-weight: 700;
  }
  .nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
  }
  .nav-links a {
    color: rgba(255,255,255,0.85);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: color .2s;
  }
  .nav-links a:hover { color: #fff; }

  /* ============ BREADCRUMB ============ */
  .breadcrumb {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 16px 32px 0;
    font-size: 13px;
    color: var(--c-text-muted);
  }
  .breadcrumb a { color: var(--c-text-muted); text-decoration: none; }
  .breadcrumb span { margin: 0 6px; color: #ccc; }

  /* ============ MAIN CONTAINER ============ */
  .product-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 24px 32px 60px;
  }

  /* ============ VALUE BAR ============ */
  .value-bar {
    background: var(--c-brand);
    color: #fff;
    border-radius: var(--radius);
    padding: 22px 28px;
    text-align: center;
    margin-bottom: 28px;
  }
  .value-bar-features {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px 28px;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.6;
  }
  .value-bar-features .sep {
    width: 1px;
    height: 16px;
    background: rgba(255,255,255,0.35);
  }
  .value-bar-features .hl {
    color: #4de7b0;
    font-weight: 600;
  }

  /* ============ SECTION HEADINGS ============ */
  .page-title {
    font-size: 32px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 8px 0 24px;
    text-align: left;
  }
  .section-title {
    color: #1a1a1a;
    font-size: 22px;
    font-weight: 700;
    border-bottom: 2px solid var(--c-brand);
    padding-bottom: 10px;
    margin: 36px 0 20px;
    text-align: left;
  }

  /* ============ TABLES ============ */
  .spec-table {
    width: 100%;
    margin: 16px auto;
    border-collapse: collapse;
    font-size: 15px;
  }
  .spec-table th {
    background: var(--c-brand);
    color: #fff;
    padding: 12px 18px;
    text-align: left;
  }
  .spec-table th:first-child { border-radius: 0 0 0 0; width: 40%; }
  .spec-table td {
    border: 1px solid var(--c-brand-border);
    padding: 12px 18px;
  }
  .spec-table tbody tr:nth-child(odd) {
    background: var(--c-brand-light);
  }
  .spec-table tbody td:first-child {
    font-weight: 600;
    color: var(--c-brand);
  }
  .spec-table tbody td:last-child {
    font-weight: 500;
  }

  /* ============ PRODUCT IMAGES (CENTERED) ============ */
  .product-images {
    text-align: center;
    margin: 24px auto;
  }
  .product-images img {
    display: inline-block;
    border-radius: var(--radius);
    max-width: 100%;
    margin-bottom: 16px;
  }
  .product-images .img-main {
    width: 100%;
    max-width: 900px;
  }
  .product-images .img-full {
    width: 100%;
    max-width: 1100px;
  }

  /* Gallery grid */
  .gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
    margin: 24px auto;
  }
  .gallery-grid .gallery-item {
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--c-brand-border);
    background: var(--c-brand-light);
  }
  .gallery-grid .gallery-item img {
    width: 100%;
    height: auto;
    display: block;
  }

  /* ============ CERTIFICATION CARD ============ */
  .cert-card {
    background: var(--c-brand-light);
    border: 1px solid var(--c-brand-border);
    border-radius: var(--radius);
    padding: 18px 22px;
    margin: 16px auto;
    text-align: center;
  }
  .cert-card-title {
    font-size: 16px;
    font-weight: bold;
    color: var(--c-brand);
    margin-bottom: 6px;
  }
  .cert-card-text {
    font-size: 13px;
    color: var(--c-text-muted);
    margin: 0;
  }

  /* ============ FAQ ============ */
  .faq-list {
    margin: 16px auto;
  }
  .faq-item {
    margin-bottom: 14px;
    padding: 14px 18px;
    background: var(--c-brand-light);
    border-radius: var(--radius);
    border-left: 4px solid var(--c-brand);
  }
  .faq-item .faq-q {
    font-size: 14px;
    font-weight: bold;
    color: var(--c-brand);
    margin-bottom: 6px;
  }
  .faq-item .faq-a {
    font-size: 14px;
    color: var(--c-text);
    line-height: 1.65;
  }

  /* ============ CTA SECTION ============ */
  .cta-section {
    text-align: center;
    margin: 36px auto;
    background: linear-gradient(135deg, var(--c-brand) 0%, #0d2e4f 100%);
    border-radius: 12px;
    padding: 36px 32px;
    color: #fff;
  }
  .cta-section h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
    color: #fff;
  }
  .cta-section p {
    font-size: 15px;
    opacity: .9;
    margin-bottom: 20px;
  }
  .cta-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
  }
  .cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 24px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all .25s ease;
    border: 2px solid rgba(255,255,255,0.4);
  }
  .cta-btn-solid {
    background: #fff;
    color: var(--c-brand);
  }
  .cta-btn-solid:hover { background: #f0f4ff; }
  .cta-btn-outline {
    background: transparent;
    color: #fff;
  }
  .cta-btn-outline:hover { background: rgba(255,255,255,0.12); }

  /* ============ FOOTER ============ */
  footer {
    text-align: center;
    padding: 28px 24px;
    color: var(--c-text-muted);
    font-size: 13px;
  }
  footer a { color: var(--c-brand); text-decoration: none; }

  /* ============ RESPONSIVE ============ */
  @media (max-width: 768px) {
    .nav-links { display: none; }
    .topbar-inner, .breadcrumb, .product-container { padding-left: 16px; padding-right: 16px; }
    .page-title { font-size: 26px; }
    .section-title { font-size: 18px; }
    .value-bar-features { gap: 8px 16px; }
    .value-bar-features .sep { display: none; }
    .gallery-grid { grid-template-columns: 1fr; }
    .spec-table { font-size: 13px; }
    .spec-table th, .spec-table td { padding: 10px 12px; }
    .cta-section { padding: 28px 20px; }
    .cta-buttons { flex-direction: column; align-items: stretch; }
    .cta-btn { justify-content: center; }
  }