/* ── Reset & base ── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
      background: #f1f4ff;
      color: #1a1a2e;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; height: auto; }

    /* ── CSS Variables ── */
    :root {
      --bg: #f1f4ff;
      --accent: #2d3a8c;
      --accent-light: #4a5bbf;
      --warm: #c07a3a;
      --text-dark: #1a1a2e;
      --text-mid: #4a4a6a;
      --text-light: #7a7a9a;
      --border: rgba(45,58,140,0.12);
      --card-bg: #ffffff;
      --radius: 16px;
      --radius-sm: 8px;
      --shadow: 0 4px 24px rgba(45,58,140,0.08);
      --shadow-lg: 0 12px 40px rgba(45,58,140,0.14);
    }

    /* ── Header / Nav ── */
    .site-header {
      background: rgba(241,244,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      position: sticky;
      top: 0;
      z-index: 100;
      padding: 0 5vw;
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
      max-width: 1280px;
      margin: 0 auto;
    }
    .brand-logo {
      font-size: 1.1rem;
      font-weight: 800;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.85rem;
      font-weight: 600;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--text-mid);
      transition: color 0.2s;
    }
    .nav-links a:hover { color: var(--accent); }
    .nav-cta {
      background: var(--accent);
      color: #fff !important;
      padding: 0.5rem 1.2rem;
      border-radius: 50px;
      font-size: 0.8rem !important;
    }
    .nav-cta:hover { background: var(--accent-light) !important; color: #fff !important; }
    .hamburger { display: none; cursor: pointer; flex-direction: column; gap: 5px; }
    .hamburger span { display: block; width: 24px; height: 2px; background: var(--accent); border-radius: 2px; }

    /* ── Page wrapper ── */
    .page { max-width: 1280px; margin: 0 auto; padding: 2rem 5vw 4rem; }

    /* ── Breadcrumb ── */
    .breadcrumb {
      font-size: 0.78rem;
      color: var(--text-light);
      margin-bottom: 1.5rem;
      display: flex;
      gap: 0.5rem;
      flex-wrap: wrap;
    }
    .breadcrumb span { color: var(--text-light); }
    .breadcrumb a:hover { color: var(--accent); }

    /* ══════════════════════════════════════
       PRODUCT HERO (gallery + info side-by-side)
    ══════════════════════════════════════ */
    .product-hero {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: start;
      margin-bottom: 4rem;
    }

    /* Gallery */
    .gallery-col { position: sticky; top: 80px; }
    .gallery-main {
      border-radius: var(--radius);
      overflow: hidden;
      background: #fff;
      box-shadow: var(--shadow);
      aspect-ratio: 1 / 1;
      cursor: zoom-in;
      position: relative;
    }
    .gallery-main img {
      width: 100%; height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .gallery-main:hover img { transform: scale(1.03); }
    .gallery-thumbs {
      display: grid;
      grid-template-columns: repeat(7, 1fr);
      gap: 8px;
      margin-top: 12px;
    }
    .thumb {
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #fff;
      cursor: pointer;
      border: 2px solid transparent;
      transition: border-color 0.2s, transform 0.2s;
      aspect-ratio: 1 / 1;
    }
    .thumb img { width: 100%; height: 100%; object-fit: cover; }
    .thumb:hover, .thumb.active { border-color: var(--accent); transform: translateY(-2px); }

    /* Info column */
    .info-col { padding-top: 0.5rem; }
    .product-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      background: rgba(45,58,140,0.08);
      color: var(--accent);
      font-size: 0.72rem;
      font-weight: 700;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      padding: 0.3rem 0.8rem;
      border-radius: 50px;
      margin-bottom: 0.8rem;
    }
    .product-title {
      font-size: clamp(1.5rem, 3vw, 2.1rem);
      font-weight: 800;
      line-height: 1.2;
      color: var(--text-dark);
      margin-bottom: 0.8rem;
    }
    .product-subtitle {
      font-size: 1rem;
      color: var(--text-mid);
      margin-bottom: 1.2rem;
      line-height: 1.5;
    }

    /* Rating */
    .rating-row {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      margin-bottom: 1.2rem;
    }
    .stars { color: #f5a623; font-size: 1rem; letter-spacing: 1px; }
    .rating-count { font-size: 0.82rem; color: var(--text-light); }

    /* Color selector */
    .option-label {
      font-size: 0.78rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--text-mid);
      margin-bottom: 0.5rem;
    }
    .color-swatches {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin-bottom: 1.2rem;
    }
    .swatch {
      width: 36px; height: 36px;
      border-radius: 50%;
      cursor: pointer;
      border: 3px solid transparent;
      outline: 2px solid transparent;
      transition: outline-color 0.2s, transform 0.2s;
      box-shadow: 0 2px 6px rgba(0,0,0,0.12);
    }
    .swatch:hover, .swatch.active {
      outline-color: var(--accent);
      outline-offset: 2px;
      transform: scale(1.1);
    }
    .swatch-navy    { background: #1c2e6b; }
    .swatch-terra   { background: #c0451a; }
    .swatch-green   { background: #1f5c2a; }
    .swatch-burgundy{ background: #6e1a2e; }
    .swatch-black   { background: #111111; }

    /* Quantity */
    .qty-row {
      display: flex;
      align-items: center;
      gap: 0.8rem;
      margin-bottom: 1.4rem;
    }
    .qty-control {
      display: flex;
      align-items: center;
      border: 1.5px solid var(--border);
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #fff;
    }
    .qty-btn {
      width: 38px; height: 38px;
      display: flex; align-items: center; justify-content: center;
      cursor: pointer;
      font-size: 1.1rem;
      color: var(--accent);
      background: none;
      border: none;
      transition: background 0.15s;
    }
    .qty-btn:hover { background: rgba(45,58,140,0.06); }
    .qty-input {
      width: 44px; text-align: center;
      border: none; outline: none;
      font-size: 0.95rem; font-weight: 600;
      background: none; color: var(--text-dark);
    }

    /* CTA buttons */
    .cta-group { display: flex; flex-direction: column; gap: 0.8rem; margin-bottom: 1.6rem; }
    .btn-primary {
      background: var(--accent);
      color: #fff;
      padding: 0.95rem 2rem;
      border-radius: 50px;
      font-weight: 700;
      font-size: 0.95rem;
      letter-spacing: 0.04em;
      text-align: center;
      cursor: pointer;
      border: none;
      transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
      box-shadow: 0 4px 18px rgba(45,58,140,0.25);
    }
    .btn-primary:hover {
      background: var(--accent-light);
      transform: translateY(-1px);
      box-shadow: 0 6px 22px rgba(45,58,140,0.32);
    }
    .btn-secondary {
      background: transparent;
      color: var(--accent);
      padding: 0.9rem 2rem;
      border-radius: 50px;
      font-weight: 700;
      font-size: 0.95rem;
      text-align: center;
      cursor: pointer;
      border: 2px solid var(--accent);
      transition: background 0.2s, color 0.2s;
    }
    .btn-secondary:hover { background: var(--accent); color: #fff; }

    /* Trust badges */
    .trust-badges {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
      padding: 1rem 0;
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
      margin-bottom: 1.4rem;
    }
    .badge-item {
      display: flex;
      align-items: center;
      gap: 0.4rem;
      font-size: 0.78rem;
      color: var(--text-mid);
      font-weight: 600;
    }
    .badge-icon { font-size: 1rem; }

    /* Specs mini-table */
    .spec-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
      margin-bottom: 1.2rem;
    }
    .spec-pill {
      background: rgba(45,58,140,0.07);
      color: var(--accent);
      font-size: 0.75rem;
      font-weight: 600;
      padding: 0.3rem 0.75rem;
      border-radius: 50px;
    }

    /* ══════════════════════════════════════
       SERIES IMAGES STRIP (PC 16:9 + Mobile 1:1)
    ══════════════════════════════════════ */
    .section-title {
      font-size: clamp(1.2rem, 2.5vw, 1.6rem);
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 0.4rem;
    }
    .section-sub {
      font-size: 0.9rem;
      color: var(--text-light);
      margin-bottom: 1.6rem;
    }
    .section-header { margin-bottom: 1rem; }

    /* PC Series (16:9 grid) */
    .series-section { margin-bottom: 4rem; }
    .pc-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .pc-card {
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
      transition: transform 0.25s, box-shadow 0.25s;
      background: #fff;
      aspect-ratio: 16 / 9;
    }
    .pc-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
    .pc-card img { width: 100%; height: 100%; object-fit: cover; }

    /* Mobile Series (1:1 grid) */
    .mobile-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
    }
    .mobile-card {
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
      transition: transform 0.25s, box-shadow 0.25s;
      background: #fff;
      aspect-ratio: 1 / 1;
    }
    .mobile-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
    .mobile-card img { width: 100%; height: 100%; object-fit: cover; }

    /* ══════════════════════════════════════
       PRODUCT DETAILS (tabs)
    ══════════════════════════════════════ */
    .detail-section { margin-bottom: 4rem; }
    .tab-nav {
      display: flex;
      gap: 0;
      border-bottom: 2px solid var(--border);
      margin-bottom: 2rem;
      overflow-x: auto;
      scrollbar-width: none;
    }
    .tab-nav::-webkit-scrollbar { display: none; }
    .tab-btn {
      padding: 0.8rem 1.4rem;
      font-size: 0.85rem;
      font-weight: 700;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      color: var(--text-light);
      background: none;
      border: none;
      border-bottom: 2px solid transparent;
      margin-bottom: -2px;
      cursor: pointer;
      white-space: nowrap;
      transition: color 0.2s, border-color 0.2s;
    }
    .tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
    .tab-content { display: none; }
    .tab-content.active { display: block; }

    /* Spec table */
    .spec-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.9rem;
    }
    .spec-table tr { border-bottom: 1px solid var(--border); }
    .spec-table tr:last-child { border-bottom: none; }
    .spec-table td {
      padding: 0.9rem 1rem;
      vertical-align: top;
    }
    .spec-table td:first-child {
      font-weight: 700;
      color: var(--text-mid);
      width: 40%;
      background: rgba(45,58,140,0.03);
    }
    .spec-table td:last-child { color: var(--text-dark); }

    /* Features grid */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 1.2rem;
    }
    .feature-card {
      background: #fff;
      border-radius: var(--radius);
      padding: 1.4rem;
      box-shadow: var(--shadow);
    }
    .feature-icon { font-size: 1.6rem; margin-bottom: 0.6rem; }
    .feature-title { font-weight: 700; font-size: 0.95rem; margin-bottom: 0.3rem; color: var(--text-dark); }
    .feature-desc { font-size: 0.82rem; color: var(--text-mid); line-height: 1.5; }

    /* Shipping info */
    .shipping-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
      gap: 1rem;
    }
    .shipping-card {
      background: #fff;
      border-radius: var(--radius);
      padding: 1.2rem;
      box-shadow: var(--shadow);
      text-align: center;
    }
    .shipping-icon { font-size: 1.8rem; margin-bottom: 0.5rem; }
    .shipping-label { font-size: 0.8rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.2rem; }
    .shipping-value { font-size: 0.85rem; color: var(--text-mid); }

    /* ══════════════════════════════════════
       HOW IT WORKS (4-step process)
    ══════════════════════════════════════ */
    .how-section { margin-bottom: 4rem; }
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1rem;
      position: relative;
    }
    .steps-grid::before {
      content: '';
      position: absolute;
      top: 32px;
      left: 12.5%;
      right: 12.5%;
      height: 2px;
      background: linear-gradient(90deg, var(--accent), var(--accent-light));
      opacity: 0.2;
    }
    .step-card {
      background: #fff;
      border-radius: var(--radius);
      padding: 1.4rem 1.2rem;
      box-shadow: var(--shadow);
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 44px; height: 44px;
      background: var(--accent);
      color: #fff;
      border-radius: 50%;
      display: flex; align-items: center; justify-content: center;
      font-weight: 800;
      font-size: 1rem;
      margin: 0 auto 0.8rem;
    }
    .step-title { font-weight: 700; font-size: 0.9rem; color: var(--text-dark); margin-bottom: 0.3rem; }
    .step-desc { font-size: 0.78rem; color: var(--text-mid); line-height: 1.5; }

    /* ══════════════════════════════════════
       CUSTOM SECTION
    ══════════════════════════════════════ */
    .custom-section {
      margin-bottom: 4rem;
      background: linear-gradient(135deg, var(--accent) 0%, #1a2060 100%);
      border-radius: var(--radius);
      padding: 3rem;
      color: #fff;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      align-items: center;
    }
    .custom-title { font-size: clamp(1.4rem, 2.5vw, 2rem); font-weight: 800; margin-bottom: 0.8rem; }
    .custom-desc { font-size: 0.9rem; opacity: 0.85; line-height: 1.6; margin-bottom: 1.4rem; }
    .custom-list { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 1.4rem; }
    .custom-list li { font-size: 0.85rem; opacity: 0.9; display: flex; align-items: center; gap: 0.5rem; }
    .custom-list li::before { content: '✓'; font-weight: 800; color: #a0c8ff; }
    .btn-white {
      display: inline-block;
      background: #fff;
      color: var(--accent);
      padding: 0.85rem 2rem;
      border-radius: 50px;
      font-weight: 800;
      font-size: 0.9rem;
      letter-spacing: 0.04em;
      cursor: pointer;
      transition: background 0.2s, transform 0.15s;
    }
    .btn-white:hover { background: rgba(255,255,255,0.9); transform: translateY(-1px); }
    .custom-image-group {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
    }
    .custom-image-group img {
      border-radius: 10px;
      aspect-ratio: 1/1;
      object-fit: cover;
      opacity: 0.9;
      transition: opacity 0.2s;
    }
    .custom-image-group img:hover { opacity: 1; }
    .custom-image-group img:first-child {
      grid-column: span 2;
      aspect-ratio: 16/9;
    }

    /* ══════════════════════════════════════
       FAQ
    ══════════════════════════════════════ */
    .faq-section { margin-bottom: 4rem; }
    .faq-list { display: flex; flex-direction: column; gap: 0; }
    .faq-item {
      border-bottom: 1px solid var(--border);
    }
    .faq-item:first-child { border-top: 1px solid var(--border); }
    .faq-q {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      padding: 1.1rem 0;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 1rem;
      transition: color 0.2s;
    }
    .faq-q:hover { color: var(--accent); }
    .faq-arrow {
      font-size: 0.9rem;
      color: var(--accent);
      transition: transform 0.25s;
      flex-shrink: 0;
    }
    .faq-item.open .faq-arrow { transform: rotate(180deg); }
    .faq-a {
      max-height: 0;
      overflow: hidden;
      font-size: 0.88rem;
      color: var(--text-mid);
      line-height: 1.7;
      transition: max-height 0.3s ease, padding 0.3s;
    }
    .faq-item.open .faq-a {
      max-height: 400px;
      padding-bottom: 1rem;
    }

    /* ══════════════════════════════════════
       WHY US / TRUST SECTION
    ══════════════════════════════════════ */
    .trust-section { margin-bottom: 4rem; }
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.2rem;
    }
    .trust-card {
      background: #fff;
      border-radius: var(--radius);
      padding: 1.6rem;
      box-shadow: var(--shadow);
      text-align: center;
    }
    .trust-icon { font-size: 2rem; margin-bottom: 0.6rem; }
    .trust-title { font-weight: 700; font-size: 0.9rem; color: var(--text-dark); margin-bottom: 0.4rem; }
    .trust-desc { font-size: 0.8rem; color: var(--text-mid); line-height: 1.5; }

    /* ══════════════════════════════════════
       CTA BANNER (bottom)
    ══════════════════════════════════════ */
    .cta-banner {
      background: var(--accent);
      border-radius: var(--radius);
      padding: 2.5rem 2rem;
      text-align: center;
      color: #fff;
      margin-bottom: 4rem;
    }
    .cta-banner h2 { font-size: clamp(1.2rem, 2.5vw, 1.8rem); font-weight: 800; margin-bottom: 0.6rem; }
    .cta-banner p { font-size: 0.9rem; opacity: 0.85; margin-bottom: 1.4rem; }

    /* ══════════════════════════════════════
       Footer
    ══════════════════════════════════════ */
    .site-footer {
      border-top: 1px solid var(--border);
      padding: 2.5rem 5vw 1.5rem;
      background: rgba(241,244,255,0.7);
    }
    .footer-inner {
      max-width: 1280px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 2rem;
    }
    .footer-brand p { font-size: 0.82rem; color: var(--text-light); margin-top: 0.5rem; line-height: 1.6; }
    .footer-col h4 { font-size: 0.78rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); margin-bottom: 0.8rem; }
    .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.4rem; }
    .footer-col ul li a { font-size: 0.82rem; color: var(--text-light); transition: color 0.2s; }
    .footer-col ul li a:hover { color: var(--accent); }
    .footer-bottom {
      max-width: 1280px;
      margin: 1.5rem auto 0;
      padding-top: 1rem;
      border-top: 1px solid var(--border);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.75rem;
      color: var(--text-light);
      flex-wrap: wrap;
      gap: 0.5rem;
    }

    /* ══════════════════════════════════════
       Lightbox
    ══════════════════════════════════════ */
    .lightbox {
      display: none;
      position: fixed; inset: 0;
      background: rgba(10,10,20,0.88);
      z-index: 999;
      align-items: center;
      justify-content: center;
      padding: 2rem;
    }
    .lightbox.open { display: flex; }
    .lightbox img {
      max-width: 90vw;
      max-height: 88vh;
      border-radius: var(--radius);
      object-fit: contain;
    }
    .lightbox-close {
      position: absolute;
      top: 1.2rem; right: 1.5rem;
      color: #fff;
      font-size: 2rem;
      cursor: pointer;
      line-height: 1;
    }
    .lb-prev, .lb-next {
      position: absolute;
      top: 50%; transform: translateY(-50%);
      color: #fff;
      font-size: 2.2rem;
      cursor: pointer;
      background: rgba(255,255,255,0.1);
      border: none;
      border-radius: 50%;
      width: 48px; height: 48px;
      display: flex; align-items: center; justify-content: center;
      transition: background 0.2s;
    }
    .lb-prev { left: 1.5rem; }
    .lb-next { right: 1.5rem; }
    .lb-prev:hover, .lb-next:hover { background: rgba(255,255,255,0.22); }

    /* ══════════════════════════════════════
       RESPONSIVE
    ══════════════════════════════════════ */
    @media (max-width: 900px) {
      .product-hero { grid-template-columns: 1fr; gap: 1.5rem; }
      .gallery-col { position: static; }
      .gallery-thumbs { grid-template-columns: repeat(7, 1fr); }
      .pc-grid { grid-template-columns: 1fr; }
      .mobile-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-grid::before { display: none; }
      .custom-section { grid-template-columns: 1fr; }
      .trust-grid { grid-template-columns: 1fr; }
      .footer-inner { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 600px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: 1fr; }
      .gallery-thumbs { grid-template-columns: repeat(4, 1fr); }
      .trust-grid { grid-template-columns: 1fr; }
      .footer-inner { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: 1fr; }
      .custom-image-group img:first-child { aspect-ratio: 1/1; }
    }