/* ===== DESIGN TOKENS ===== */
    :root {
      --bg:         #f1f4ff;
      --white:      #ffffff;
      --accent:     #3a5bdf;
      --accent-dk:  #2843b8;
      --silver:     #7a8499;
      --text:       #1a1d2e;
      --muted:      #6b7280;
      --border:     #dde3f5;
      --card-bg:    #ffffff;
      --radius-sm:  6px;
      --radius-md:  12px;
      --radius-lg:  20px;
      --shadow-sm:  0 2px 8px rgba(58,91,223,.08);
      --shadow-md:  0 6px 24px rgba(58,91,223,.13);
      --transition: .22s ease;
      --max-w:      1240px;
    }

    /* ===== RESET ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img { display: block; max-width: 100%; height: auto; }
    a { color: inherit; text-decoration: none; }
    button { cursor: pointer; font-family: inherit; border: none; background: none; }

    /* ===== LAYOUT HELPERS ===== */
    .container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }
    section { padding: 64px 0; }

    /* ===== NAV ===== */
    .nav {
      position: sticky; top: 0; z-index: 100;
      background: rgba(241,244,255,.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    .nav__inner {
      max-width: var(--max-w);
      margin: 0 auto;
      padding: 0 20px;
      height: 62px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }
    .nav__logo {
      font-size: 1.1rem;
      font-weight: 800;
      letter-spacing: .12em;
      text-transform: uppercase;
      color: var(--text);
      white-space: nowrap;
    }
    .nav__logo span { color: var(--accent); }
    .nav__links {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav__links a {
      font-size: .88rem;
      font-weight: 500;
      color: var(--muted);
      transition: color var(--transition);
    }
    .nav__links a:hover { color: var(--accent); }
    .nav__cta {
      padding: 9px 22px;
      background: var(--accent);
      color: #fff;
      border-radius: 50px;
      font-size: .85rem;
      font-weight: 600;
      letter-spacing: .04em;
      transition: background var(--transition), transform var(--transition);
      white-space: nowrap;
    }
    .nav__cta:hover { background: var(--accent-dk); transform: translateY(-1px); }
    .nav__hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
    .nav__hamburger span {
      display: block; width: 22px; height: 2px;
      background: var(--text); border-radius: 2px;
      transition: var(--transition);
    }
    .nav__mobile-menu {
      display: none;
      position: fixed; inset: 62px 0 0 0;
      background: var(--bg);
      z-index: 99;
      padding: 32px 24px;
      flex-direction: column;
      gap: 24px;
    }
    .nav__mobile-menu.open { display: flex; }
    .nav__mobile-menu a {
      font-size: 1.1rem; font-weight: 600;
      color: var(--text);
      padding: 12px 0;
      border-bottom: 1px solid var(--border);
    }

    /* ===== PRODUCT HERO ===== */
    .product-hero {
      padding: 40px 0 56px;
    }
    .product-hero__inner {
      display: grid;
      grid-template-columns: 88px 1fr 1fr;
      gap: 20px;
      align-items: start;
    }

    /* Thumbnail strip */
    .thumb-strip {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .thumb-strip__item {
      width: 80px; height: 80px;
      border-radius: var(--radius-sm);
      overflow: hidden;
      cursor: pointer;
      border: 2px solid transparent;
      transition: border-color var(--transition), transform var(--transition);
      flex-shrink: 0;
    }
    .thumb-strip__item img {
      width: 100%; height: 100%; object-fit: cover;
    }
    .thumb-strip__item.active,
    .thumb-strip__item:hover { border-color: var(--accent); transform: scale(1.04); }

    /* Main image */
    .main-image {
      position: sticky; top: 82px;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: var(--white);
      box-shadow: var(--shadow-md);
      aspect-ratio: 1 / 1;
    }
    .main-image img {
      width: 100%; height: 100%;
      object-fit: cover;
      transition: opacity .3s ease;
    }
    .main-image__badge {
      position: absolute; top: 16px; left: 16px;
      background: var(--accent);
      color: #fff;
      font-size: .72rem;
      font-weight: 700;
      letter-spacing: .08em;
      text-transform: uppercase;
      padding: 5px 12px;
      border-radius: 50px;
    }

    /* Product info */
    .product-info {
      padding: 4px 0;
    }
    .product-info__brand {
      font-size: .75rem;
      font-weight: 700;
      letter-spacing: .14em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 8px;
    }
    .product-info__title {
      font-size: 1.75rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 14px;
      color: var(--text);
    }
    .product-info__subtitle {
      font-size: .95rem;
      color: var(--muted);
      margin-bottom: 24px;
    }

    /* Stars */
    .stars {
      display: flex; align-items: center; gap: 6px;
      margin-bottom: 20px;
    }
    .stars__icons { color: #f59e0b; font-size: 1rem; letter-spacing: 2px; }
    .stars__count { font-size: .82rem; color: var(--muted); }

    /* Tag badges */
    .tags {
      display: flex; flex-wrap: wrap; gap: 8px;
      margin-bottom: 28px;
    }
    .tag {
      padding: 5px 14px;
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 50px;
      font-size: .78rem;
      font-weight: 600;
      color: var(--text);
    }

    /* Specs table */
    .spec-table {
      width: 100%;
      border-collapse: collapse;
      margin-bottom: 28px;
      font-size: .88rem;
    }
    .spec-table tr { border-bottom: 1px solid var(--border); }
    .spec-table td {
      padding: 10px 8px;
      vertical-align: top;
    }
    .spec-table td:first-child {
      font-weight: 600;
      color: var(--muted);
      width: 46%;
      white-space: nowrap;
    }
    .spec-table td:last-child { color: var(--text); }

    /* CTA buttons */
    .cta-group {
      display: flex; gap: 12px; flex-wrap: wrap;
      margin-bottom: 24px;
    }
    .btn-primary {
      flex: 1; min-width: 160px;
      padding: 15px 28px;
      background: var(--accent);
      color: #fff;
      border-radius: var(--radius-md);
      font-size: .95rem;
      font-weight: 700;
      letter-spacing: .03em;
      text-align: center;
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
      box-shadow: 0 4px 16px rgba(58,91,223,.3);
    }
    .btn-primary:hover {
      background: var(--accent-dk);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(58,91,223,.4);
    }
    .btn-secondary {
      flex: 1; min-width: 140px;
      padding: 15px 28px;
      background: transparent;
      color: var(--accent);
      border: 2px solid var(--accent);
      border-radius: var(--radius-md);
      font-size: .95rem;
      font-weight: 700;
      text-align: center;
      transition: all var(--transition);
    }
    .btn-secondary:hover {
      background: var(--accent);
      color: #fff;
    }

    /* Trust badges */
    .trust-badges {
      display: flex; gap: 18px; flex-wrap: wrap;
      margin-top: 20px;
    }
    .trust-badge {
      display: flex; align-items: center; gap: 6px;
      font-size: .78rem;
      color: var(--muted);
      font-weight: 500;
    }
    .trust-badge svg { flex-shrink: 0; }

    /* ===== FEATURES STRIP ===== */
    .features-strip {
      background: var(--white);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
      padding: 0;
    }
    .features-strip__inner {
      max-width: var(--max-w);
      margin: 0 auto;
      padding: 0 20px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      divide: horizontal;
    }
    .feature-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      padding: 32px 20px;
      border-right: 1px solid var(--border);
    }
    .feature-item:last-child { border-right: none; }
    .feature-item__icon {
      width: 48px; height: 48px;
      background: var(--bg);
      border-radius: 50%;
      display: flex; align-items: center; justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    .feature-item__title {
      font-size: .9rem;
      font-weight: 700;
      margin-bottom: 4px;
    }
    .feature-item__desc {
      font-size: .78rem;
      color: var(--muted);
    }

    /* ===== SECTION HEADING ===== */
    .section-heading {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-heading__eyebrow {
      font-size: .72rem;
      font-weight: 700;
      letter-spacing: .16em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 10px;
    }
    .section-heading__title {
      font-size: 2rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 14px;
    }
    .section-heading__body {
      max-width: 560px;
      margin: 0 auto;
      color: var(--muted);
      font-size: .95rem;
    }

    /* ===== GALLERY GRID (16:9 desktop images) ===== */
    .gallery-grid {
      columns: 2;
      column-gap: 16px;
      padding: 0 20px;
    }
    .gallery-grid__item {
      break-inside: avoid;
      margin-bottom: 16px;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .gallery-grid__item img {
      width: 100%;
      display: block;
      transition: transform .4s ease;
    }
    .gallery-grid__item:hover img { transform: scale(1.03); }

    /* ===== SPECS SECTION ===== */
    .specs-section { background: var(--white); }
    .specs-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .specs-grid__image {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .specs-grid__image img { width: 100%; }
    .full-spec-table {
      width: 100%;
      border-collapse: collapse;
      font-size: .9rem;
    }
    .full-spec-table th {
      text-align: left;
      padding: 14px 16px;
      background: var(--bg);
      font-weight: 700;
      font-size: .8rem;
      letter-spacing: .06em;
      text-transform: uppercase;
      color: var(--muted);
      border-bottom: 2px solid var(--border);
    }
    .full-spec-table td {
      padding: 13px 16px;
      border-bottom: 1px solid var(--border);
      vertical-align: top;
    }
    .full-spec-table td:first-child { font-weight: 600; color: var(--text); width: 44%; }
    .full-spec-table tr:last-child td { border-bottom: none; }
    .full-spec-table tr:hover td { background: rgba(241,244,255,.6); }

    /* ===== MOBILE GALLERY (1:1 images) ===== */
    .mobile-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
    }
    .mobile-gallery__item {
      border-radius: var(--radius-md);
      overflow: hidden;
      aspect-ratio: 1/1;
      box-shadow: var(--shadow-sm);
    }
    .mobile-gallery__item img {
      width: 100%; height: 100%; object-fit: cover;
      transition: transform .35s ease;
    }
    .mobile-gallery__item:hover img { transform: scale(1.05); }

    /* ===== FAQ ===== */
    .faq-list {
      max-width: 780px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      margin-bottom: 10px;
      overflow: hidden;
    }
    .faq-item__q {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 22px;
      font-size: .95rem;
      font-weight: 600;
      text-align: left;
      background: transparent;
      transition: background var(--transition);
      gap: 12px;
    }
    .faq-item__q:hover { background: var(--bg); }
    .faq-item__icon {
      width: 28px; height: 28px;
      border-radius: 50%;
      background: var(--bg);
      border: 1px solid var(--border);
      display: flex; align-items: center; justify-content: center;
      flex-shrink: 0;
      font-size: 1rem;
      font-weight: 700;
      color: var(--accent);
      transition: transform var(--transition), background var(--transition);
    }
    .faq-item.open .faq-item__icon { transform: rotate(45deg); background: var(--accent); color: #fff; border-color: var(--accent); }
    .faq-item__a {
      max-height: 0;
      overflow: hidden;
      transition: max-height .35s ease, padding .35s ease;
      padding: 0 22px;
      font-size: .9rem;
      color: var(--muted);
      line-height: 1.7;
    }
    .faq-item.open .faq-item__a { max-height: 400px; padding: 0 22px 20px; }

    /* ===== CTA BANNER ===== */
    .cta-banner {
      background: linear-gradient(135deg, #3a5bdf 0%, #2843b8 60%, #1e30a0 100%);
      color: #fff;
      text-align: center;
      padding: 72px 20px;
    }
    .cta-banner__title {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 14px;
      line-height: 1.2;
    }
    .cta-banner__body {
      opacity: .82;
      max-width: 520px;
      margin: 0 auto 32px;
      font-size: 1rem;
    }
    .cta-banner__btns {
      display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
    }
    .btn-white {
      padding: 14px 32px;
      background: #fff;
      color: var(--accent);
      border-radius: var(--radius-md);
      font-weight: 700;
      font-size: .95rem;
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.18); }
    .btn-outline-white {
      padding: 14px 32px;
      border: 2px solid rgba(255,255,255,.6);
      color: #fff;
      border-radius: var(--radius-md);
      font-weight: 700;
      font-size: .95rem;
      transition: border-color var(--transition), background var(--transition);
    }
    .btn-outline-white:hover { border-color: #fff; background: rgba(255,255,255,.1); }

    /* ===== FOOTER ===== */
    .footer {
      background: var(--white);
      border-top: 1px solid var(--border);
      padding: 48px 0 32px;
    }
    .footer__inner {
      max-width: var(--max-w);
      margin: 0 auto;
      padding: 0 20px;
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer__brand-name {
      font-size: 1rem;
      font-weight: 800;
      letter-spacing: .12em;
      text-transform: uppercase;
      margin-bottom: 12px;
    }
    .footer__brand-name span { color: var(--accent); }
    .footer__tagline {
      font-size: .83rem;
      color: var(--muted);
      line-height: 1.7;
      max-width: 240px;
    }
    .footer__col-title {
      font-size: .78rem;
      font-weight: 700;
      letter-spacing: .12em;
      text-transform: uppercase;
      color: var(--text);
      margin-bottom: 16px;
    }
    .footer__links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer__links a {
      font-size: .85rem;
      color: var(--muted);
      transition: color var(--transition);
    }
    .footer__links a:hover { color: var(--accent); }
    .footer__bottom {
      max-width: var(--max-w);
      margin: 32px auto 0;
      padding: 20px 20px 0;
      border-top: 1px solid var(--border);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .footer__bottom p { font-size: .78rem; color: var(--muted); }

    /* ===== LIGHTBOX ===== */
    .lightbox {
      display: none;
      position: fixed; inset: 0;
      background: rgba(0,0,0,.85);
      z-index: 999;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }
    .lightbox.open { display: flex; }
    .lightbox__img {
      max-width: 90vw;
      max-height: 88vh;
      border-radius: var(--radius-lg);
      box-shadow: 0 24px 64px rgba(0,0,0,.5);
      object-fit: contain;
    }
    .lightbox__close {
      position: fixed; top: 20px; right: 24px;
      background: rgba(255,255,255,.18);
      color: #fff;
      border: none;
      width: 42px; height: 42px;
      border-radius: 50%;
      font-size: 1.3rem;
      display: flex; align-items: center; justify-content: center;
      cursor: pointer;
      transition: background var(--transition);
    }
    .lightbox__close:hover { background: rgba(255,255,255,.32); }

    /* ===== MOBILE HERO SLIDER ===== */
    .mobile-hero-slider { display: none; }
    .mobile-hero-slider__track {
      display: flex;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
      gap: 12px;
      padding-bottom: 12px;
      scrollbar-width: none;
    }
    .mobile-hero-slider__track::-webkit-scrollbar { display: none; }
    .mobile-hero-slider__slide {
      flex-shrink: 0;
      width: 88%;
      aspect-ratio: 1/1;
      scroll-snap-align: center;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .mobile-hero-slider__slide img {
      width: 100%; height: 100%; object-fit: cover;
    }
    .slider-dots {
      display: flex; justify-content: center; gap: 6px;
      margin-top: 12px;
    }
    .slider-dot {
      width: 7px; height: 7px;
      background: var(--border);
      border-radius: 50%;
      cursor: pointer;
      transition: background var(--transition), transform var(--transition);
    }
    .slider-dot.active { background: var(--accent); transform: scale(1.3); }

    /* ===== RESPONSIVE ===== */
    @media (max-width: 1024px) {
      .product-hero__inner {
        grid-template-columns: 72px 1fr 1fr;
        gap: 14px;
      }
      .thumb-strip__item { width: 66px; height: 66px; }
      .mobile-gallery { grid-template-columns: repeat(3, 1fr); }
      .footer__inner { grid-template-columns: 1fr 1fr; gap: 28px; }
    }

    @media (max-width: 768px) {
      .nav__links { display: none; }
      .nav__cta { display: none; }
      .nav__hamburger { display: flex; }

      .product-hero__inner { display: none; }
      .mobile-hero-slider { display: block; padding: 0 20px; }

      .mobile-product-info { display: block; padding: 24px 20px 0; }
      .desktop-product-info { display: none; }

      .features-strip__inner { grid-template-columns: 1fr 1fr; }
      .feature-item { border-right: none; border-bottom: 1px solid var(--border); }
      .feature-item:nth-child(odd) { border-right: 1px solid var(--border); }
      .feature-item:last-child, .feature-item:nth-last-child(2):nth-child(odd) { border-bottom: none; }

      .gallery-grid { columns: 1; }
      .specs-grid { grid-template-columns: 1fr; }
      .mobile-gallery { grid-template-columns: repeat(2, 1fr); }
      .footer__inner { grid-template-columns: 1fr; gap: 24px; }
      .footer__tagline { max-width: 100%; }

      section { padding: 40px 0; }
      .section-heading__title { font-size: 1.55rem; }
      .cta-banner__title { font-size: 1.65rem; }
    }

    @media (min-width: 769px) {
      .mobile-product-info { display: none; }
      .desktop-product-info { display: block; }
    }

    /* ===== SCROLL ANIMATION ===== */
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity .55s ease, transform .55s ease;
    }
    .reveal.visible { opacity: 1; transform: none; }